<?php

/**
 * SCSSPHP
 *
 * @copyright 2012-2020 Leaf Corcoran
 *
 * @license http://opensource.org/licenses/MIT MIT
 *
 * @link http://scssphp.github.io/scssphp
 */

namespace ScssPhp\ScssPhp;

use ScssPhp\ScssPhp\Base\Range;

> use ScssPhp\ScssPhp\Block\AtRootBlock;
use ScssPhp\ScssPhp\Compiler\Environment;
> use ScssPhp\ScssPhp\Block\CallableBlock;
use ScssPhp\ScssPhp\Exception\CompilerException;
> use ScssPhp\ScssPhp\Block\DirectiveBlock;
use ScssPhp\ScssPhp\Exception\ParserException;
> use ScssPhp\ScssPhp\Block\EachBlock;
use ScssPhp\ScssPhp\Exception\SassScriptException;
> use ScssPhp\ScssPhp\Block\ElseBlock;
use ScssPhp\ScssPhp\Formatter\Compressed;
> use ScssPhp\ScssPhp\Block\ElseifBlock;
use ScssPhp\ScssPhp\Formatter\Expanded;
> use ScssPhp\ScssPhp\Block\ForBlock;
use ScssPhp\ScssPhp\Formatter\OutputBlock;
> use ScssPhp\ScssPhp\Block\IfBlock;
use ScssPhp\ScssPhp\Node\Number;
> use ScssPhp\ScssPhp\Block\MediaBlock;
use ScssPhp\ScssPhp\SourceMap\SourceMapGenerator;
> use ScssPhp\ScssPhp\Block\NestedPropertyBlock;
use ScssPhp\ScssPhp\Util\Path;
> use ScssPhp\ScssPhp\Block\WhileBlock;

> use ScssPhp\ScssPhp\Compiler\CachedResult;


/**

> use ScssPhp\ScssPhp\Exception\SassException;


 * The scss compiler and parser.

> use ScssPhp\ScssPhp\Logger\LoggerInterface;
 *
> use ScssPhp\ScssPhp\Logger\StreamLogger;


 * Converting SCSS to CSS is a three stage process. The incoming file is parsed
 * by `Parser` into a syntax tree, then it is compiled into another tree
 * representing the CSS structure by `Compiler`. The CSS tree is fed into a
 * formatter, like `Formatter` which then outputs CSS as a string.
 *
 * During the first compile, all values are *reduced*, which means that their
 * types are brought to the lowest form before being dump as strings. This
 * handles math equations, variable dereferences, and the like.
 *
 * The `compile` function of `Compiler` is the entry point.
 *
 * In summary:
 *
 * The `Compiler` class creates an instance of the parser, feeds it SCSS code,
 * then transforms the resulting tree to a CSS tree. This class also holds the
 * evaluation context, such as all available mixins and variables at any given
 * time.
 *
 * The `Parser` class is only concerned with parsing its input.
 *
 * The `Formatter` takes a CSS tree, and dumps it to a formatted string,
 * handling things like indentation.
 */

/**
 * SCSS compiler
 *
 * @author Leaf Corcoran <leafot@gmail.com>

>  *
 */
>  * @final Extending the Compiler is deprecated


class Compiler
{
    /**
     * @deprecated
     */
    const LINE_COMMENTS = 1;
    /**
     * @deprecated
     */
    const DEBUG_INFO    = 2;

    /**
     * @deprecated
     */
    const WITH_RULE     = 1;
    /**
     * @deprecated
     */
    const WITH_MEDIA    = 2;
    /**
     * @deprecated
     */
    const WITH_SUPPORTS = 4;
    /**
     * @deprecated
     */
    const WITH_ALL      = 7;

    const SOURCE_MAP_NONE   = 0;
    const SOURCE_MAP_INLINE = 1;
    const SOURCE_MAP_FILE   = 2;

    /**
     * @var array<string, string>
     */
    protected static $operatorNames = [
        '+'   => 'add',
        '-'   => 'sub',
        '*'   => 'mul',
        '/'   => 'div',
        '%'   => 'mod',

        '=='  => 'eq',
        '!='  => 'neq',
        '<'   => 'lt',
        '>'   => 'gt',

        '<='  => 'lte',
        '>='  => 'gte',
    ];

    /**
     * @var array<string, string>
     */
    protected static $namespaces = [
        'special'  => '%',
        'mixin'    => '@',
        'function' => '^',
    ];

    public static $true         = [Type::T_KEYWORD, 'true'];
    public static $false        = [Type::T_KEYWORD, 'false'];
    /** @deprecated */
    public static $NaN          = [Type::T_KEYWORD, 'NaN'];
    /** @deprecated */
    public static $Infinity     = [Type::T_KEYWORD, 'Infinity'];
    public static $null         = [Type::T_NULL];
    public static $nullString   = [Type::T_STRING, '', []];
    public static $defaultValue = [Type::T_KEYWORD, ''];
    public static $selfSelector = [Type::T_SELF];
    public static $emptyList    = [Type::T_LIST, '', []];
    public static $emptyMap     = [Type::T_MAP, [], []];
    public static $emptyString  = [Type::T_STRING, '"', []];
    public static $with         = [Type::T_KEYWORD, 'with'];
    public static $without      = [Type::T_KEYWORD, 'without'];

>     private static $emptyArgumentList = [Type::T_LIST, '', [], []];



    /**
     * @var array<int, string|callable>
     */
    protected $importPaths = [];
    /**
     * @var array<string, Block>
     */
    protected $importCache = [];

> 


    /**
     * @var string[]
     */
    protected $importedFiles = [];

> 
    protected $userFunctions = [];
>     /**
    protected $registeredVars = [];
>      * @var array
    /**
>      * @phpstan-var array<string, array{0: callable, 1: string[]|null}>
     * @var array<string, bool>
>      */


     */

>     /**
    protected $registeredFeatures = [
>      * @var array<string, mixed>
        'extend-selector-pseudoclass' => false,
>      */


        'at-error'                    => true,
        'units-level-3'               => true,
        'global-variable-shadowing'   => false,
    ];

    /**
     * @var string|null
     */
    protected $encoding = null;
    /**

>      * @var null


     * @deprecated
     */
    protected $lineNumberStyle = null;

    /**
     * @var int|SourceMapGenerator
     * @phpstan-var self::SOURCE_MAP_*|SourceMapGenerator
     */
    protected $sourceMap = self::SOURCE_MAP_NONE;

> 
    protected $sourceMapOptions = [];
>     /**

>      * @var array
    /**
>      * @phpstan-var array{sourceRoot?: string, sourceMapFilename?: string|null, sourceMapURL?: string|null, sourceMapWriteTo?: string|null, outputSourceFiles?: bool, sourceMapRootpath?: string, sourceMapBasepath?: string}
     * @var string|\ScssPhp\ScssPhp\Formatter
>      */



<      * @var string|\ScssPhp\ScssPhp\Formatter



>      * @var bool
>      */
>     private $charset = true;
> 
>     /**
>      * @var Formatter



<     protected $formatter = Expanded::class;



>     protected $formatter;
> 
>     /**
>      * @var string
>      * @phpstan-var class-string<Formatter>
>      */
>     private $configuredFormatter = Expanded::class;



    /**
     * @var Environment
     */
    protected $rootEnv;
    /**
     * @var OutputBlock|null
     */
    protected $rootBlock;

    /**
     * @var \ScssPhp\ScssPhp\Compiler\Environment
     */
    protected $env;
    /**
     * @var OutputBlock|null
     */
    protected $scope;
    /**
     * @var Environment|null
     */
    protected $storeEnv;
    /**
     * @var bool|null

>      *
     */
>      * @deprecated


    protected $charsetSeen;
    /**

<      * @var array<int, string>



>      * @var array<int, string|null>


     */
    protected $sourceNames;

    /**
     * @var Cache|null
     */
    protected $cache;

    /**

>      * @var bool
     * @var int
>      */
     */
>     protected $cacheCheckImportResolutions = false;
    protected $indentLevel;
> 
    /**
>     /**


     * @var array[]
     */
    protected $extends;
    /**
     * @var array<string, int[]>
     */
    protected $extendsMap;

> 


    /**
     * @var array<string, int>
     */

<     protected $parsedFiles;



>     protected $parsedFiles = [];
> 


    /**
     * @var Parser|null
     */
    protected $parser;
    /**
     * @var int|null
     */
    protected $sourceIndex;
    /**
     * @var int|null
     */
    protected $sourceLine;
    /**
     * @var int|null
     */
    protected $sourceColumn;
    /**

<      * @var resource
<      */
<     protected $stderr;
<     /**


     * @var bool|null
     */
    protected $shouldEvaluate;
    /**
     * @var null
     * @deprecated
     */
    protected $ignoreErrors;
    /**
     * @var bool
     */
    protected $ignoreCallStackMessage = false;

    /**
     * @var array[]
     */
    protected $callStack = [];

    /**

>      * @var array
     * The directory of the currently processed file
>      * @phpstan-var list<array{currentDir: string|null, path: string, filePath: string}>
     *
>      */
     * @var string|null
>     private $resolvedImports = [];
     */
> 
    private $currentDirectory;
>     /**



    /**
     * The directory of the input file
     *
     * @var string
     */
    private $rootDirectory;


>     /**
    private $legacyCwdImportPath = true;
>      * @var bool

>      */


    /**

>      * @var LoggerInterface
     * Constructor
>      */
     *
>     private $logger;
     * @param array|null $cacheOptions
> 
     */
>     /**
    public function __construct($cacheOptions = null)
>      * @var array<string, bool>
    {
>      */
        $this->parsedFiles = [];
>     private $warnedChildFunctions = [];
        $this->sourceNames = [];
> 

>     /**


        if ($cacheOptions) {

>      * @phpstan-param array{cacheDir?: string, prefix?: string, forceRefresh?: string, checkImportResolutions?: bool}|null $cacheOptions



<         $this->parsedFiles = [];


        }

>             if (!empty($cacheOptions['checkImportResolutions'])) {

>                 $this->cacheCheckImportResolutions = true;
        $this->stderr = fopen('php://stderr', 'w');
>             }



<         $this->stderr = fopen('php://stderr', 'w');



>         $this->logger = new StreamLogger(fopen('php://stderr', 'w'), true);



    /**
     * Get compiler options
     *
     * @return array<string, mixed>

>      *
     */
>      * @internal


    public function getCompileOptions()
    {
        $options = [
            'importPaths'        => $this->importPaths,
            'registeredVars'     => $this->registeredVars,
            'registeredFeatures' => $this->registeredFeatures,
            'encoding'           => $this->encoding,
            'sourceMap'          => serialize($this->sourceMap),
            'sourceMapOptions'   => $this->sourceMapOptions,

<             'formatter'          => $this->formatter,



>             'formatter'          => $this->configuredFormatter,


            'legacyImportPath'   => $this->legacyCwdImportPath,
        ];

        return $options;
    }

    /**

>      * Sets an alternative logger.
     * Set an alternative error output stream, for testing purpose only
>      *
     *
>      * Changing the logger in the middle of the compilation is not
     * @param resource $handle
>      * supported and will result in an undefined behavior.
     *
>      *
     * @return void
>      * @param LoggerInterface $logger
     */
>      *
    public function setErrorOuput($handle)
>      * @return void
    {
>      */
        $this->stderr = $handle;
>     public function setLogger(LoggerInterface $logger)
    }
>     {

>         $this->logger = $logger;
    /**
>     }
     * Compile scss
> 
     *
>     /**


     * @api

>      *
     *
>      * @deprecated Use {@see setLogger} instead



<         $this->stderr = $handle;



>         @trigger_error('The method "setErrorOuput" is deprecated. Use "setLogger" instead.', E_USER_DEPRECATED);
> 
>         $this->logger = new StreamLogger($handle);



<      * @api
<      *



<      * @param string $path



>      * @param string|null $path


     */

>      *
    public function compile($code, $path = null)
>      * @throws SassException when the source fails to compile
    {
>      *
        if ($this->cache) {
>      * @deprecated Use {@see compileString} instead.



<         if ($this->cache) {
<             $cacheKey       = ($path ? $path : '(stdin)') . ':' . md5($code);
<             $compileOptions = $this->getCompileOptions();
<             $cache          = $this->cache->getCache('compile', $cacheKey, $compileOptions);



>         @trigger_error(sprintf('The "%s" method is deprecated. Use "compileString" instead.', __METHOD__), E_USER_DEPRECATED);



<             if (\is_array($cache) && isset($cache['dependencies']) && isset($cache['out'])) {
<                 // check if any dependency file changed before accepting the cache
<                 foreach ($cache['dependencies'] as $file => $mtime) {
<                     if (! is_file($file) || filemtime($file) !== $mtime) {
<                         unset($cache);
<                         break;



>         $result = $this->compileString($code, $path);
> 
>         $sourceMap = $result->getSourceMap();
> 
>         if ($sourceMap !== null) {
>             if ($this->sourceMap instanceof SourceMapGenerator) {
>                 $this->sourceMap->saveMap($sourceMap);
>             } elseif ($this->sourceMap === self::SOURCE_MAP_FILE) {
>                 $sourceMapGenerator = new SourceMapGenerator($this->sourceMapOptions);
>                 $sourceMapGenerator->saveMap($sourceMap);


                    }
                }


<                 if (isset($cache)) {
<                     return $cache['out'];



>         return $result->getCss();


                }

> 
            }
>     /**
        }
>      * Compile scss

>      *

>      * @param string      $source
        $this->indentLevel    = -1;
>      * @param string|null $path
        $this->extends        = [];
>      *
        $this->extendsMap     = [];
>      * @return CompilationResult
        $this->sourceIndex    = null;
>      *
        $this->sourceLine     = null;
>      * @throws SassException when the source fails to compile
        $this->sourceColumn   = null;
>      */
        $this->env            = null;
>     public function compileString($source, $path = null)
        $this->scope          = null;
>     {
        $this->storeEnv       = null;
>         if ($this->cache) {
        $this->charsetSeen    = null;
>             $cacheKey       = ($path ? $path : '(stdin)') . ':' . md5($source);
        $this->shouldEvaluate = null;
>             $compileOptions = $this->getCompileOptions();
        $this->ignoreCallStackMessage = false;
>             $cachedResult = $this->cache->getCache('compile', $cacheKey, $compileOptions);

> 
        if (!\is_null($path) && is_file($path)) {
>             if ($cachedResult instanceof CachedResult && $this->isFreshCachedResult($cachedResult)) {
            $path = realpath($path) ?: $path;
>                 return $cachedResult->getResult();



< 



<         $this->charsetSeen    = null;


        } else {

>         $this->parsedFiles = [];
            $this->currentDirectory = null;
>         $this->importedFiles = [];
            $this->rootDirectory = getcwd();
>         $this->resolvedImports = [];


        }

        try {
            $this->parser = $this->parserFactory($path);

<             $tree         = $this->parser->parse($code);



>             $tree         = $this->parser->parse($source);


            $this->parser = null;


<             $this->formatter = new $this->formatter();



>             $this->formatter = new $this->configuredFormatter();


            $this->rootBlock = null;
            $this->rootEnv   = $this->pushEnv($tree);


>             $warnCallback = function ($message, $deprecation) {
            $this->injectVariables($this->registeredVars);
>                 $this->logger->warn($message, $deprecation);
            $this->compileRoot($tree);
>             };
            $this->popEnv();
>             $previousWarnCallback = Warn::setCallback($warnCallback);

> 
            $sourceMapGenerator = null;
>             try {




>             } finally {
            if ($this->sourceMap) {
>                 Warn::setCallback($previousWarnCallback);
                if (\is_object($this->sourceMap) && $this->sourceMap instanceof SourceMapGenerator) {
>             }


                    $sourceMapGenerator = $this->sourceMap;
                    $this->sourceMap = self::SOURCE_MAP_FILE;
                } elseif ($this->sourceMap !== self::SOURCE_MAP_NONE) {
                    $sourceMapGenerator = new SourceMapGenerator($this->sourceMapOptions);
                }
            }

>             assert($this->scope !== null);



            $out = $this->formatter->format($this->scope, $sourceMapGenerator);

            $prefix = '';


<             if (!$this->charsetSeen) {
<                 if (strlen($out) !== Util::mbStrlen($out)) {



>             if ($this->charset && strlen($out) !== Util::mbStrlen($out)) {


                    $prefix = '@charset "UTF-8";' . "\n";
                    $out = $prefix . $out;
                }

<             }



> 
>             $sourceMap = null;



            if (! empty($out) && $this->sourceMap && $this->sourceMap !== self::SOURCE_MAP_NONE) {

>                 assert($sourceMapGenerator !== null);


                $sourceMap    = $sourceMapGenerator->generateJson($prefix);
                $sourceMapUrl = null;

                switch ($this->sourceMap) {
                    case self::SOURCE_MAP_INLINE:
                        $sourceMapUrl = sprintf('data:application/json,%s', Util::encodeURIComponent($sourceMap));
                        break;

                    case self::SOURCE_MAP_FILE:

<                         $sourceMapUrl = $sourceMapGenerator->saveMap($sourceMap);



>                         if (isset($this->sourceMapOptions['sourceMapURL'])) {
>                             $sourceMapUrl = $this->sourceMapOptions['sourceMapURL'];
>                         }


                        break;
                }


>                 if ($sourceMapUrl !== null) {


                $out .= sprintf('/*# sourceMappingURL=%s */', $sourceMapUrl);
            }

>             }


        } catch (SassScriptException $e) {

<             throw $this->error($e->getMessage());



>             throw new CompilerException($this->addLocationToMessage($e->getMessage()), 0, $e);
>         }
> 
>         $includedFiles = [];
> 
>         foreach ($this->resolvedImports as $resolvedImport) {
>             $includedFiles[$resolvedImport['filePath']] = $resolvedImport['filePath'];


        }


>         $result = new CompilationResult($out, $sourceMap, array_values($includedFiles));
        if ($this->cache && isset($cacheKey) && isset($compileOptions)) {
> 



<             $v = [
<                 'dependencies' => $this->getParsedFiles(),
<                 'out' => &$out,
<             ];



>             $this->cache->setCache('compile', $cacheKey, new CachedResult($result, $this->parsedFiles, $this->resolvedImports), $compileOptions);
>         }
> 
>         // Reset state to free memory
>         // TODO in 2.0, reset parsedFiles as well when the getter is removed.
>         $this->resolvedImports = [];
>         $this->importedFiles = [];




<             $this->cache->setCache('compile', $cacheKey, $v, $compileOptions);



>         return $result;


        }


<         return $out;



>     /**
>      * @param CachedResult $result
>      *
>      * @return bool
>      */
>     private function isFreshCachedResult(CachedResult $result)
>     {
>         // check if any dependency file changed since the result was compiled
>         foreach ($result->getParsedFiles() as $file => $mtime) {
>             if (! is_file($file) || filemtime($file) !== $mtime) {
>                 return false;
>             }
>         }
> 
>         if ($this->cacheCheckImportResolutions) {
>             $resolvedImports = [];
> 
>             foreach ($result->getResolvedImports() as $import) {
>                 $currentDir = $import['currentDir'];
>                 $path = $import['path'];
>                 // store the check across all the results in memory to avoid multiple findImport() on the same path
>                 // with same context.
>                 // this is happening in a same hit with multiple compilations (especially with big frameworks)
>                 if (empty($resolvedImports[$currentDir][$path])) {
>                     $resolvedImports[$currentDir][$path] = $this->findImport($path, $currentDir);
>                 }
> 
>                 if ($resolvedImports[$currentDir][$path] !== $import['filePath']) {
>                     return false;
>                 }
>             }
>         }
> 
>         return true;


    }

    /**
     * Instantiate parser
     *

<      * @param string $path



>      * @param string|null $path


     *
     * @return \ScssPhp\ScssPhp\Parser
     */
    protected function parserFactory($path)
    {
        // https://sass-lang.com/documentation/at-rules/import
        // CSS files imported by Sass don’t allow any special Sass features.
        // In order to make sure authors don’t accidentally write Sass in their CSS,
        // all Sass features that aren’t also valid CSS will produce errors.
        // Otherwise, the CSS will be rendered as-is. It can even be extended!
        $cssOnly = false;


<         if (substr($path, '-4') === '.css') {



>         if ($path !== null && substr($path, -4) === '.css') {


            $cssOnly = true;
        }


<         $parser = new Parser($path, \count($this->sourceNames), $this->encoding, $this->cache, $cssOnly);



>         $parser = new Parser($path, \count($this->sourceNames), $this->encoding, $this->cache, $cssOnly, $this->logger);



        $this->sourceNames[] = $path;
        $this->addParsedFile($path);

        return $parser;
    }

    /**
     * Is self extend?
     *
     * @param array $target
     * @param array $origin
     *

<      * @return boolean



>      * @return bool


     */
    protected function isSelfExtend($target, $origin)
    {
        foreach ($origin as $sel) {
            if (\in_array($target, $sel)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Push extends
     *

<      * @param array      $target



>      * @param string[]   $target


     * @param array      $origin
     * @param array|null $block
     *
     * @return void
     */
    protected function pushExtends($target, $origin, $block)
    {
        $i = \count($this->extends);
        $this->extends[] = [$target, $origin, $block];

        foreach ($target as $part) {
            if (isset($this->extendsMap[$part])) {
                $this->extendsMap[$part][] = $i;
            } else {
                $this->extendsMap[$part] = [$i];
            }
        }
    }

    /**
     * Make output block
     *

<      * @param string $type
<      * @param array  $selectors



>      * @param string|null   $type
>      * @param string[]|null $selectors


     *
     * @return \ScssPhp\ScssPhp\Formatter\OutputBlock
     */
    protected function makeOutputBlock($type, $selectors = null)
    {
        $out = new OutputBlock();
        $out->type      = $type;
        $out->lines     = [];
        $out->children  = [];
        $out->parent    = $this->scope;
        $out->selectors = $selectors;
        $out->depth     = $this->env->depth;

        if ($this->env->block instanceof Block) {
            $out->sourceName   = $this->env->block->sourceName;
            $out->sourceLine   = $this->env->block->sourceLine;
            $out->sourceColumn = $this->env->block->sourceColumn;
        } else {

<             $out->sourceName   = null;
<             $out->sourceLine   = null;
<             $out->sourceColumn = null;



>             $out->sourceName = isset($this->sourceNames[$this->sourceIndex]) ? $this->sourceNames[$this->sourceIndex] : '(stdin)';
>             $out->sourceLine = $this->sourceLine;
>             $out->sourceColumn = $this->sourceColumn;


        }

        return $out;
    }

    /**
     * Compile root
     *
     * @param \ScssPhp\ScssPhp\Block $rootBlock
     *
     * @return void
     */
    protected function compileRoot(Block $rootBlock)
    {
        $this->rootBlock = $this->scope = $this->makeOutputBlock(Type::T_ROOT);

        $this->compileChildrenNoReturn($rootBlock->children, $this->scope);

>         assert($this->scope !== null);


        $this->flattenSelectors($this->scope);
        $this->missingSelectors();
    }

    /**
     * Report missing selectors
     *
     * @return void
     */
    protected function missingSelectors()
    {
        foreach ($this->extends as $extend) {
            if (isset($extend[3])) {
                continue;
            }

            list($target, $origin, $block) = $extend;

            // ignore if !optional
            if ($block[2]) {
                continue;
            }

            $target = implode(' ', $target);
            $origin = $this->collapseSelectors($origin);

            $this->sourceLine = $block[Parser::SOURCE_LINE];
            throw $this->error("\"$origin\" failed to @extend \"$target\". The selector \"$target\" was not found.");
        }
    }

    /**
     * Flatten selectors
     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $block
     * @param string                                 $parentKey
     *
     * @return void
     */
    protected function flattenSelectors(OutputBlock $block, $parentKey = null)
    {
        if ($block->selectors) {
            $selectors = [];

            foreach ($block->selectors as $s) {
                $selectors[] = $s;

                if (! \is_array($s)) {
                    continue;
                }

                // check extends
                if (! empty($this->extendsMap)) {
                    $this->matchExtends($s, $selectors);

                    // remove duplicates
                    array_walk($selectors, function (&$value) {
                        $value = serialize($value);
                    });

                    $selectors = array_unique($selectors);

                    array_walk($selectors, function (&$value) {
                        $value = unserialize($value);
                    });
                }
            }

            $block->selectors = [];
            $placeholderSelector = false;

            foreach ($selectors as $selector) {
                if ($this->hasSelectorPlaceholder($selector)) {
                    $placeholderSelector = true;
                    continue;
                }

                $block->selectors[] = $this->compileSelector($selector);
            }

            if ($placeholderSelector && 0 === \count($block->selectors) && null !== $parentKey) {

>                 assert($block->parent !== null);


                unset($block->parent->children[$parentKey]);

                return;
            }
        }

        foreach ($block->children as $key => $child) {
            $this->flattenSelectors($child, $key);
        }
    }

    /**

<      * Glue parts of :not( or :nth-child( ... that are in general splitted in selectors parts



>      * Glue parts of :not( or :nth-child( ... that are in general split in selectors parts


     *
     * @param array $parts
     *
     * @return array
     */
    protected function glueFunctionSelectors($parts)
    {
        $new = [];

        foreach ($parts as $part) {
            if (\is_array($part)) {
                $part = $this->glueFunctionSelectors($part);
                $new[] = $part;
            } else {
                // a selector part finishing with a ) is the last part of a :not( or :nth-child(
                // and need to be joined to this
                if (
                    \count($new) && \is_string($new[\count($new) - 1]) &&
                    \strlen($part) && substr($part, -1) === ')' && strpos($part, '(') === false
                ) {
                    while (\count($new) > 1 && substr($new[\count($new) - 1], -1) !== '(') {
                        $part = array_pop($new) . $part;
                    }
                    $new[\count($new) - 1] .= $part;
                } else {
                    $new[] = $part;
                }
            }
        }

        return $new;
    }

    /**
     * Match extends
     *
     * @param array   $selector
     * @param array   $out

<      * @param integer $from
<      * @param boolean $initial



>      * @param int   $from
>      * @param bool  $initial


     *
     * @return void
     */
    protected function matchExtends($selector, &$out, $from = 0, $initial = true)
    {
        static $partsPile = [];
        $selector = $this->glueFunctionSelectors($selector);

        if (\count($selector) == 1 && \in_array(reset($selector), $partsPile)) {
            return;
        }

        $outRecurs = [];

        foreach ($selector as $i => $part) {
            if ($i < $from) {
                continue;
            }

            // check that we are not building an infinite loop of extensions
            // if the new part is just including a previous part don't try to extend anymore
            if (\count($part) > 1) {
                foreach ($partsPile as $previousPart) {
                    if (! \count(array_diff($previousPart, $part))) {
                        continue 2;
                    }
                }
            }

            $partsPile[] = $part;

            if ($this->matchExtendsSingle($part, $origin, $initial)) {
                $after       = \array_slice($selector, $i + 1);
                $before      = \array_slice($selector, 0, $i);
                list($before, $nonBreakableBefore) = $this->extractRelationshipFromFragment($before);

                foreach ($origin as $new) {
                    $k = 0;

                    // remove shared parts
                    if (\count($new) > 1) {
                        while ($k < $i && isset($new[$k]) && $selector[$k] === $new[$k]) {
                            $k++;
                        }
                    }

                    if (\count($nonBreakableBefore) && $k === \count($new)) {
                        $k--;
                    }

                    $replacement = [];
                    $tempReplacement = $k > 0 ? \array_slice($new, $k) : $new;

                    for ($l = \count($tempReplacement) - 1; $l >= 0; $l--) {
                        $slice = [];

                        foreach ($tempReplacement[$l] as $chunk) {
                            if (! \in_array($chunk, $slice)) {
                                $slice[] = $chunk;
                            }
                        }

                        array_unshift($replacement, $slice);

                        if (! $this->isImmediateRelationshipCombinator(end($slice))) {
                            break;
                        }
                    }

                    $afterBefore = $l != 0 ? \array_slice($tempReplacement, 0, $l) : [];

                    // Merge shared direct relationships.
                    $mergedBefore = $this->mergeDirectRelationships($afterBefore, $nonBreakableBefore);

                    $result = array_merge(
                        $before,
                        $mergedBefore,
                        $replacement,
                        $after
                    );

                    if ($result === $selector) {
                        continue;
                    }

                    $this->pushOrMergeExtentedSelector($out, $result);

                    // recursively check for more matches
                    $startRecurseFrom = \count($before) + min(\count($nonBreakableBefore), \count($mergedBefore));

                    if (\count($origin) > 1) {
                        $this->matchExtends($result, $out, $startRecurseFrom, false);
                    } else {
                        $this->matchExtends($result, $outRecurs, $startRecurseFrom, false);
                    }

                    // selector sequence merging
                    if (! empty($before) && \count($new) > 1) {
                        $preSharedParts = $k > 0 ? \array_slice($before, 0, $k) : [];
                        $postSharedParts = $k > 0 ? \array_slice($before, $k) : $before;

                        list($betweenSharedParts, $nonBreakabl2) = $this->extractRelationshipFromFragment($afterBefore);

                        $result2 = array_merge(
                            $preSharedParts,
                            $betweenSharedParts,
                            $postSharedParts,
                            $nonBreakabl2,
                            $nonBreakableBefore,
                            $replacement,
                            $after
                        );

                        $this->pushOrMergeExtentedSelector($out, $result2);
                    }
                }
            }
            array_pop($partsPile);
        }

        while (\count($outRecurs)) {
            $result = array_shift($outRecurs);
            $this->pushOrMergeExtentedSelector($out, $result);
        }
    }

    /**
     * Test a part for being a pseudo selector
     *
     * @param string $part
     * @param array  $matches
     *

<      * @return boolean



>      * @return bool


     */
    protected function isPseudoSelector($part, &$matches)
    {
        if (
            strpos($part, ':') === 0 &&
            preg_match(",^::?([\w-]+)\((.+)\)$,", $part, $matches)
        ) {
            return true;
        }

        return false;
    }

    /**
     * Push extended selector except if
     *  - this is a pseudo selector
     *  - same as previous
     *  - in a white list
     * in this case we merge the pseudo selector content
     *
     * @param array $out
     * @param array $extended
     *
     * @return void
     */
    protected function pushOrMergeExtentedSelector(&$out, $extended)
    {
        if (\count($out) && \count($extended) === 1 && \count(reset($extended)) === 1) {
            $single = reset($extended);
            $part = reset($single);

            if (
                $this->isPseudoSelector($part, $matchesExtended) &&
                \in_array($matchesExtended[1], [ 'slotted' ])
            ) {
                $prev = end($out);
                $prev = $this->glueFunctionSelectors($prev);

                if (\count($prev) === 1 && \count(reset($prev)) === 1) {
                    $single = reset($prev);
                    $part = reset($single);

                    if (
                        $this->isPseudoSelector($part, $matchesPrev) &&
                        $matchesPrev[1] === $matchesExtended[1]
                    ) {
                        $extended = explode($matchesExtended[1] . '(', $matchesExtended[0], 2);
                        $extended[1] = $matchesPrev[2] . ', ' . $extended[1];
                        $extended = implode($matchesExtended[1] . '(', $extended);
                        $extended = [ [ $extended ]];
                        array_pop($out);
                    }
                }
            }
        }
        $out[] = $extended;
    }

    /**
     * Match extends single
     *
     * @param array   $rawSingle
     * @param array   $outOrigin

<      * @param boolean $initial



>      * @param bool  $initial


     *

<      * @return boolean



>      * @return bool


     */
    protected function matchExtendsSingle($rawSingle, &$outOrigin, $initial = true)
    {
        $counts = [];
        $single = [];

        // simple usual cases, no need to do the whole trick
        if (\in_array($rawSingle, [['>'],['+'],['~']])) {
            return false;
        }

        foreach ($rawSingle as $part) {
            // matches Number
            if (! \is_string($part)) {
                return false;
            }

            if (! preg_match('/^[\[.:#%]/', $part) && \count($single)) {
                $single[\count($single) - 1] .= $part;
            } else {
                $single[] = $part;
            }
        }

        $extendingDecoratedTag = false;

        if (\count($single) > 1) {
            $matches = null;
            $extendingDecoratedTag = preg_match('/^[a-z0-9]+$/i', $single[0], $matches) ? $matches[0] : false;
        }

        $outOrigin = [];
        $found = false;

        foreach ($single as $k => $part) {
            if (isset($this->extendsMap[$part])) {
                foreach ($this->extendsMap[$part] as $idx) {
                    $counts[$idx] = isset($counts[$idx]) ? $counts[$idx] + 1 : 1;
                }
            }

            if (
                $initial &&
                $this->isPseudoSelector($part, $matches) &&
                ! \in_array($matches[1], [ 'not' ])
            ) {
                $buffer    = $matches[2];
                $parser    = $this->parserFactory(__METHOD__);

                if ($parser->parseSelector($buffer, $subSelectors, false)) {
                    foreach ($subSelectors as $ksub => $subSelector) {
                        $subExtended = [];
                        $this->matchExtends($subSelector, $subExtended, 0, false);

                        if ($subExtended) {
                            $subSelectorsExtended = $subSelectors;
                            $subSelectorsExtended[$ksub] = $subExtended;

                            foreach ($subSelectorsExtended as $ksse => $sse) {
                                $subSelectorsExtended[$ksse] = $this->collapseSelectors($sse);
                            }

                            $subSelectorsExtended = implode(', ', $subSelectorsExtended);
                            $singleExtended = $single;
                            $singleExtended[$k] = str_replace('(' . $buffer . ')', "($subSelectorsExtended)", $part);
                            $outOrigin[] = [ $singleExtended ];
                            $found = true;
                        }
                    }
                }
            }
        }

        foreach ($counts as $idx => $count) {
            list($target, $origin, /* $block */) = $this->extends[$idx];

            $origin = $this->glueFunctionSelectors($origin);

            // check count
            if ($count !== \count($target)) {
                continue;
            }

            $this->extends[$idx][3] = true;

            $rem = array_diff($single, $target);

            foreach ($origin as $j => $new) {
                // prevent infinite loop when target extends itself
                if ($this->isSelfExtend($single, $origin) && ! $initial) {
                    return false;
                }

                $replacement = end($new);

                // Extending a decorated tag with another tag is not possible.
                if (
                    $extendingDecoratedTag && $replacement[0] != $extendingDecoratedTag &&
                    preg_match('/^[a-z0-9]+$/i', $replacement[0])
                ) {
                    unset($origin[$j]);
                    continue;
                }

                $combined = $this->combineSelectorSingle($replacement, $rem);

                if (\count(array_diff($combined, $origin[$j][\count($origin[$j]) - 1]))) {
                    $origin[$j][\count($origin[$j]) - 1] = $combined;
                }
            }

            $outOrigin = array_merge($outOrigin, $origin);

            $found = true;
        }

        return $found;
    }

    /**
     * Extract a relationship from the fragment.
     *
     * When extracting the last portion of a selector we will be left with a
     * fragment which may end with a direction relationship combinator. This
     * method will extract the relationship fragment and return it along side
     * the rest.
     *
     * @param array $fragment The selector fragment maybe ending with a direction relationship combinator.
     *
     * @return array The selector without the relationship fragment if any, the relationship fragment.
     */
    protected function extractRelationshipFromFragment(array $fragment)
    {
        $parents = [];
        $children = [];

        $j = $i = \count($fragment);

        for (;;) {
            $children = $j != $i ? \array_slice($fragment, $j, $i - $j) : [];
            $parents  = \array_slice($fragment, 0, $j);
            $slice    = end($parents);

            if (empty($slice) || ! $this->isImmediateRelationshipCombinator($slice[0])) {
                break;
            }

            $j -= 2;
        }

        return [$parents, $children];
    }

    /**
     * Combine selector single
     *
     * @param array $base
     * @param array $other
     *
     * @return array
     */
    protected function combineSelectorSingle($base, $other)
    {
        $tag    = [];
        $out    = [];
        $wasTag = false;
        $pseudo = [];

        while (\count($other) && strpos(end($other), ':') === 0) {
            array_unshift($pseudo, array_pop($other));
        }

        foreach ([array_reverse($base), array_reverse($other)] as $single) {
            $rang = count($single);

            foreach ($single as $part) {
                if (preg_match('/^[\[:]/', $part)) {
                    $out[] = $part;
                    $wasTag = false;
                } elseif (preg_match('/^[\.#]/', $part)) {
                    array_unshift($out, $part);
                    $wasTag = false;
                } elseif (preg_match('/^[^_-]/', $part) && $rang === 1) {
                    $tag[] = $part;
                    $wasTag = true;
                } elseif ($wasTag) {
                    $tag[\count($tag) - 1] .= $part;
                } else {
                    array_unshift($out, $part);
                }
                $rang--;
            }
        }

        if (\count($tag)) {
            array_unshift($out, $tag[0]);
        }

        while (\count($pseudo)) {
            $out[] = array_shift($pseudo);
        }

        return $out;
    }

    /**
     * Compile media
     *
     * @param \ScssPhp\ScssPhp\Block $media
     *
     * @return void
     */
    protected function compileMedia(Block $media)
    {

>         assert($media instanceof MediaBlock);


        $this->pushEnv($media);

        $mediaQueries = $this->compileMediaQuery($this->multiplyMedia($this->env));


<         if (! empty($mediaQueries) && $mediaQueries) {



>         if (! empty($mediaQueries)) {
>             assert($this->scope !== null);


            $previousScope = $this->scope;
            $parentScope = $this->mediaParent($this->scope);

            foreach ($mediaQueries as $mediaQuery) {
                $this->scope = $this->makeOutputBlock(Type::T_MEDIA, [$mediaQuery]);

                $parentScope->children[] = $this->scope;
                $parentScope = $this->scope;
            }

            // top level properties in a media cause it to be wrapped
            $needsWrap = false;

            foreach ($media->children as $child) {
                $type = $child[0];

                if (
                    $type !== Type::T_BLOCK &&
                    $type !== Type::T_MEDIA &&
                    $type !== Type::T_DIRECTIVE &&
                    $type !== Type::T_IMPORT
                ) {
                    $needsWrap = true;
                    break;
                }
            }

            if ($needsWrap) {
                $wrapped = new Block();
                $wrapped->sourceName   = $media->sourceName;
                $wrapped->sourceIndex  = $media->sourceIndex;
                $wrapped->sourceLine   = $media->sourceLine;
                $wrapped->sourceColumn = $media->sourceColumn;
                $wrapped->selectors    = [];
                $wrapped->comments     = [];
                $wrapped->parent       = $media;
                $wrapped->children     = $media->children;

                $media->children = [[Type::T_BLOCK, $wrapped]];
            }

            $this->compileChildrenNoReturn($media->children, $this->scope);

            $this->scope = $previousScope;
        }

        $this->popEnv();
    }

    /**
     * Media parent
     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $scope
     *
     * @return \ScssPhp\ScssPhp\Formatter\OutputBlock
     */
    protected function mediaParent(OutputBlock $scope)
    {
        while (! empty($scope->parent)) {
            if (! empty($scope->type) && $scope->type !== Type::T_MEDIA) {
                break;
            }

            $scope = $scope->parent;
        }

        return $scope;
    }

    /**
     * Compile directive
     *

<      * @param \ScssPhp\ScssPhp\Block|array $block



>      * @param DirectiveBlock|array                   $directive


     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     *
     * @return void
     */
    protected function compileDirective($directive, OutputBlock $out)
    {
        if (\is_array($directive)) {
            $directiveName = $this->compileDirectiveName($directive[0]);
            $s = '@' . $directiveName;

            if (! empty($directive[1])) {
                $s .= ' ' . $this->compileValue($directive[1]);
            }
            // sass-spec compliance on newline after directives, a bit tricky :/
            $appendNewLine = (! empty($directive[2]) || strpos($s, "\n")) ? "\n" : "";
            if (\is_array($directive[0]) && empty($directive[1])) {
                $appendNewLine = "\n";
            }

            if (empty($directive[3])) {
                $this->appendRootDirective($s . ';' . $appendNewLine, $out, [Type::T_COMMENT, Type::T_DIRECTIVE]);
            } else {
                $this->appendOutputLine($out, Type::T_DIRECTIVE, $s . ';');
            }
        } else {
            $directive->name = $this->compileDirectiveName($directive->name);
            $s = '@' . $directive->name;

            if (! empty($directive->value)) {
                $s .= ' ' . $this->compileValue($directive->value);
            }

            if ($directive->name === 'keyframes' || substr($directive->name, -10) === '-keyframes') {
                $this->compileKeyframeBlock($directive, [$s]);
            } else {
                $this->compileNestedBlock($directive, [$s]);
            }
        }
    }

    /**
     * directive names can include some interpolation
     *
     * @param string|array $directiveName

<      * @return array|string



>      * @return string


     * @throws CompilerException
     */
    protected function compileDirectiveName($directiveName)
    {
        if (is_string($directiveName)) {
            return $directiveName;
        }

        return $this->compileValue($directiveName);
    }

    /**
     * Compile at-root
     *
     * @param \ScssPhp\ScssPhp\Block $block
     *
     * @return void
     */
    protected function compileAtRoot(Block $block)
    {

>         assert($block instanceof AtRootBlock);


        $env     = $this->pushEnv($block);
        $envs    = $this->compactEnv($env);
        list($with, $without) = $this->compileWith(isset($block->with) ? $block->with : null);

        // wrap inline selector
        if ($block->selector) {
            $wrapped = new Block();
            $wrapped->sourceName   = $block->sourceName;
            $wrapped->sourceIndex  = $block->sourceIndex;
            $wrapped->sourceLine   = $block->sourceLine;
            $wrapped->sourceColumn = $block->sourceColumn;
            $wrapped->selectors    = $block->selector;
            $wrapped->comments     = [];
            $wrapped->parent       = $block;
            $wrapped->children     = $block->children;
            $wrapped->selfParent   = $block->selfParent;

            $block->children = [[Type::T_BLOCK, $wrapped]];
            $block->selector = null;
        }

        $selfParent = $block->selfParent;

>         assert($selfParent !== null, 'at-root blocks must have a selfParent set.');



        if (

<             ! $block->selfParent->selectors &&
<             isset($block->parent) && $block->parent &&



>             ! $selfParent->selectors &&
>             isset($block->parent) &&


            isset($block->parent->selectors) && $block->parent->selectors
        ) {
            $selfParent = $block->parent;
        }

        $this->env = $this->filterWithWithout($envs, $with, $without);


>         assert($this->scope !== null);


        $saveScope   = $this->scope;
        $this->scope = $this->filterScopeWithWithout($saveScope, $with, $without);

        // propagate selfParent to the children where they still can be useful
        $this->compileChildrenNoReturn($block->children, $this->scope, $selfParent);


<         $this->scope = $this->completeScope($this->scope, $saveScope);



>         assert($this->scope !== null);
>         $this->completeScope($this->scope, $saveScope);


        $this->scope = $saveScope;
        $this->env   = $this->extractEnv($envs);

        $this->popEnv();
    }

    /**

<      * Filter at-root scope depending of with/without option



>      * Filter at-root scope depending on with/without option


     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $scope
     * @param array                                  $with
     * @param array                                  $without
     *
     * @return OutputBlock
     */
    protected function filterScopeWithWithout($scope, $with, $without)
    {
        $filteredScopes = [];
        $childStash = [];


<         if ($scope->type === TYPE::T_ROOT) {



>         if ($scope->type === Type::T_ROOT) {


            return $scope;
        }

>         assert($this->rootBlock !== null);



        // start from the root

<         while ($scope->parent && $scope->parent->type !== TYPE::T_ROOT) {



>         while ($scope->parent && $scope->parent->type !== Type::T_ROOT) {


            array_unshift($childStash, $scope);
            $scope = $scope->parent;
        }

        for (;;) {
            if (! $scope) {
                break;
            }

            if ($this->isWith($scope, $with, $without)) {
                $s = clone $scope;
                $s->children = [];
                $s->lines    = [];
                $s->parent   = null;

                if ($s->type !== Type::T_MEDIA && $s->type !== Type::T_DIRECTIVE) {
                    $s->selectors = [];
                }

                $filteredScopes[] = $s;
            }

            if (\count($childStash)) {
                $scope = array_shift($childStash);
            } elseif ($scope->children) {
                $scope = end($scope->children);
            } else {
                $scope = null;
            }
        }

        if (! \count($filteredScopes)) {
            return $this->rootBlock;
        }

        $newScope = array_shift($filteredScopes);
        $newScope->parent = $this->rootBlock;

        $this->rootBlock->children[] = $newScope;

        $p = &$newScope;

        while (\count($filteredScopes)) {
            $s = array_shift($filteredScopes);
            $s->parent = $p;
            $p->children[] = $s;
            $newScope = &$p->children[0];
            $p = &$p->children[0];
        }

        return $newScope;
    }

    /**
     * found missing selector from a at-root compilation in the previous scope
     * (if at-root is just enclosing a property, the selector is in the parent tree)
     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $scope
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $previousScope
     *
     * @return OutputBlock
     */
    protected function completeScope($scope, $previousScope)
    {

<         if (! $scope->type && (! $scope->selectors || ! \count($scope->selectors)) && \count($scope->lines)) {



>         if (! $scope->type && ! $scope->selectors && \count($scope->lines)) {


            $scope->selectors = $this->findScopeSelectors($previousScope, $scope->depth);
        }

        if ($scope->children) {
            foreach ($scope->children as $k => $c) {
                $scope->children[$k] = $this->completeScope($c, $previousScope);
            }
        }

        return $scope;
    }

    /**
     * Find a selector by the depth node in the scope
     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $scope

<      * @param integer                                $depth



>      * @param int                                    $depth


     *
     * @return array
     */
    protected function findScopeSelectors($scope, $depth)
    {
        if ($scope->depth === $depth && $scope->selectors) {
            return $scope->selectors;
        }

        if ($scope->children) {
            foreach (array_reverse($scope->children) as $c) {
                if ($s = $this->findScopeSelectors($c, $depth)) {
                    return $s;
                }
            }
        }

        return [];
    }

    /**
     * Compile @at-root's with: inclusion / without: exclusion into 2 lists uses to filter scope/env later
     *

<      * @param array $withCondition



>      * @param array|null $withCondition


     *
     * @return array

>      *
     */
>      * @phpstan-return array{array<string, bool>, array<string, bool>}


    protected function compileWith($withCondition)
    {
        // just compile what we have in 2 lists
        $with = [];
        $without = ['rule' => true];

        if ($withCondition) {
            if ($withCondition[0] === Type::T_INTERPOLATE) {
                $w = $this->compileValue($withCondition);

                $buffer = "($w)";
                $parser = $this->parserFactory(__METHOD__);

                if ($parser->parseValue($buffer, $reParsedWith)) {
                    $withCondition = $reParsedWith;
                }
            }


<             if ($this->libMapHasKey([$withCondition, static::$with])) {



>             $withConfig = $this->mapGet($withCondition, static::$with);
>             if ($withConfig !== null) {


                $without = []; // cancel the default

<                 $list = $this->coerceList($this->libMapGet([$withCondition, static::$with]));



>                 $list = $this->coerceList($withConfig);



                foreach ($list[2] as $item) {
                    $keyword = $this->compileStringContent($this->coerceString($item));

                    $with[$keyword] = true;
                }
            }


<             if ($this->libMapHasKey([$withCondition, static::$without])) {



>             $withoutConfig = $this->mapGet($withCondition, static::$without);
>             if ($withoutConfig !== null) {


                $without = []; // cancel the default

<                 $list = $this->coerceList($this->libMapGet([$withCondition, static::$without]));



>                 $list = $this->coerceList($withoutConfig);



                foreach ($list[2] as $item) {
                    $keyword = $this->compileStringContent($this->coerceString($item));

                    $without[$keyword] = true;
                }
            }
        }

        return [$with, $without];
    }

    /**
     * Filter env stack
     *
     * @param Environment[] $envs
     * @param array $with
     * @param array $without
     *
     * @return Environment
     *
     * @phpstan-param  non-empty-array<Environment> $envs
     */
    protected function filterWithWithout($envs, $with, $without)
    {
        $filtered = [];

        foreach ($envs as $e) {
            if ($e->block && ! $this->isWith($e->block, $with, $without)) {
                $ec = clone $e;
                $ec->block     = null;
                $ec->selectors = [];

                $filtered[] = $ec;
            } else {
                $filtered[] = $e;
            }
        }

        return $this->extractEnv($filtered);
    }

    /**
     * Filter WITH rules
     *
     * @param \ScssPhp\ScssPhp\Block|\ScssPhp\ScssPhp\Formatter\OutputBlock $block
     * @param array                                                         $with
     * @param array                                                         $without
     *

<      * @return boolean



>      * @return bool


     */
    protected function isWith($block, $with, $without)
    {
        if (isset($block->type)) {
            if ($block->type === Type::T_MEDIA) {
                return $this->testWithWithout('media', $with, $without);
            }

            if ($block->type === Type::T_DIRECTIVE) {

>                 assert($block instanceof DirectiveBlock || $block instanceof OutputBlock);


                if (isset($block->name)) {
                    return $this->testWithWithout($this->compileDirectiveName($block->name), $with, $without);
                } elseif (isset($block->selectors) && preg_match(',@(\w+),ims', json_encode($block->selectors), $m)) {
                    return $this->testWithWithout($m[1], $with, $without);
                } else {
                    return $this->testWithWithout('???', $with, $without);
                }
            }
        } elseif (isset($block->selectors)) {
            // a selector starting with number is a keyframe rule
            if (\count($block->selectors)) {
                $s = reset($block->selectors);

                while (\is_array($s)) {
                    $s = reset($s);
                }

                if (\is_object($s) && $s instanceof Number) {
                    return $this->testWithWithout('keyframes', $with, $without);
                }
            }

            return $this->testWithWithout('rule', $with, $without);
        }

        return true;
    }

    /**
     * Test a single type of block against with/without lists
     *
     * @param string $what
     * @param array  $with
     * @param array  $without
     *

<      * @return boolean



>      * @return bool


     *   true if the block should be kept, false to reject
     */
    protected function testWithWithout($what, $with, $without)
    {
        // if without, reject only if in the list (or 'all' is in the list)
        if (\count($without)) {
            return (isset($without[$what]) || isset($without['all'])) ? false : true;
        }

        // otherwise reject all what is not in the with list
        return (isset($with[$what]) || isset($with['all'])) ? true : false;
    }


    /**
     * Compile keyframe block
     *
     * @param \ScssPhp\ScssPhp\Block $block

<      * @param array                  $selectors



>      * @param string[]               $selectors


     *
     * @return void
     */
    protected function compileKeyframeBlock(Block $block, $selectors)
    {
        $env = $this->pushEnv($block);

        $envs = $this->compactEnv($env);

        $this->env = $this->extractEnv(array_filter($envs, function (Environment $e) {
            return ! isset($e->block->selectors);
        }));

        $this->scope = $this->makeOutputBlock($block->type, $selectors);
        $this->scope->depth = 1;

>         assert($this->scope->parent !== null);


        $this->scope->parent->children[] = $this->scope;

        $this->compileChildrenNoReturn($block->children, $this->scope);


>         assert($this->scope !== null);


        $this->scope = $this->scope->parent;
        $this->env   = $this->extractEnv($envs);

        $this->popEnv();
    }

    /**
     * Compile nested properties lines
     *
     * @param \ScssPhp\ScssPhp\Block                 $block
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     *
     * @return void
     */
    protected function compileNestedPropertiesBlock(Block $block, OutputBlock $out)
    {

>         assert($block instanceof NestedPropertyBlock);


        $prefix = $this->compileValue($block->prefix) . '-';

        $nested = $this->makeOutputBlock($block->type);
        $nested->parent = $out;

        if ($block->hasValue) {
            $nested->depth = $out->depth + 1;
        }

        $out->children[] = $nested;

        foreach ($block->children as $child) {
            switch ($child[0]) {
                case Type::T_ASSIGN:
                    array_unshift($child[1][2], $prefix);
                    break;

                case Type::T_NESTED_PROPERTY:

>                     assert($child[1] instanceof NestedPropertyBlock);


                    array_unshift($child[1]->prefix[2], $prefix);
                    break;
            }

            $this->compileChild($child, $nested);
        }
    }

    /**
     * Compile nested block
     *
     * @param \ScssPhp\ScssPhp\Block $block

<      * @param array                  $selectors



>      * @param string[]               $selectors


     *
     * @return void
     */
    protected function compileNestedBlock(Block $block, $selectors)
    {
        $this->pushEnv($block);

        $this->scope = $this->makeOutputBlock($block->type, $selectors);

>         assert($this->scope->parent !== null);


        $this->scope->parent->children[] = $this->scope;

        // wrap assign children in a block
        // except for @font-face

<         if ($block->type !== Type::T_DIRECTIVE || $this->compileDirectiveName($block->name) !== 'font-face') {



>         if (!$block instanceof DirectiveBlock || $this->compileDirectiveName($block->name) !== 'font-face') {


            // need wrapping?
            $needWrapping = false;

            foreach ($block->children as $child) {
                if ($child[0] === Type::T_ASSIGN) {
                    $needWrapping = true;
                    break;
                }
            }

            if ($needWrapping) {
                $wrapped = new Block();
                $wrapped->sourceName   = $block->sourceName;
                $wrapped->sourceIndex  = $block->sourceIndex;
                $wrapped->sourceLine   = $block->sourceLine;
                $wrapped->sourceColumn = $block->sourceColumn;
                $wrapped->selectors    = [];
                $wrapped->comments     = [];
                $wrapped->parent       = $block;
                $wrapped->children     = $block->children;
                $wrapped->selfParent   = $block->selfParent;

                $block->children = [[Type::T_BLOCK, $wrapped]];
            }
        }

        $this->compileChildrenNoReturn($block->children, $this->scope);


>         assert($this->scope !== null);


        $this->scope = $this->scope->parent;

        $this->popEnv();
    }

    /**
     * Recursively compiles a block.
     *
     * A block is analogous to a CSS block in most cases. A single SCSS document
     * is encapsulated in a block when parsed, but it does not have parent tags
     * so all of its children appear on the root level when compiled.
     *
     * Blocks are made up of selectors and children.
     *
     * The children of a block are just all the blocks that are defined within.
     *
     * Compiling the block involves pushing a fresh environment on the stack,
     * and iterating through the props, compiling each one.
     *
     * @see Compiler::compileChild()
     *
     * @param \ScssPhp\ScssPhp\Block $block
     *
     * @return void
     */
    protected function compileBlock(Block $block)
    {
        $env = $this->pushEnv($block);

>         assert($block->selectors !== null);


        $env->selectors = $this->evalSelectors($block->selectors);

        $out = $this->makeOutputBlock(null);


>         assert($this->scope !== null);


        $this->scope->children[] = $out;

        if (\count($block->children)) {
            $out->selectors = $this->multiplySelectors($env, $block->selfParent);

            // propagate selfParent to the children where they still can be useful
            $selfParentSelectors = null;

            if (isset($block->selfParent->selectors)) {
                $selfParentSelectors = $block->selfParent->selectors;
                $block->selfParent->selectors = $out->selectors;
            }

            $this->compileChildrenNoReturn($block->children, $out, $block->selfParent);

            // and revert for the following children of the same block
            if ($selfParentSelectors) {

>                 assert($block->selfParent !== null);


                $block->selfParent->selectors = $selfParentSelectors;
            }
        }

        $this->popEnv();
    }


    /**
     * Compile the value of a comment that can have interpolation
     *
     * @param array   $value

<      * @param boolean $pushEnv



>      * @param bool  $pushEnv


     *
     * @return string
     */
    protected function compileCommentValue($value, $pushEnv = false)
    {
        $c = $value[1];

        if (isset($value[2])) {
            if ($pushEnv) {
                $this->pushEnv();
            }


<             $ignoreCallStackMessage = $this->ignoreCallStackMessage;
<             $this->ignoreCallStackMessage = true;
< 


            try {
                $c = $this->compileValue($value[2]);

<             } catch (\Exception $e) {



>             } catch (SassScriptException $e) {
>                 $this->logger->warn('Ignoring interpolation errors in multiline comments is deprecated and will be removed in ScssPhp 2.0. ' . $this->addLocationToMessage($e->getMessage()), true);
>                 // ignore error in comment compilation which are only interpolation
>             } catch (SassException $e) {
>                 $this->logger->warn('Ignoring interpolation errors in multiline comments is deprecated and will be removed in ScssPhp 2.0. ' . $e->getMessage(), true);


                // ignore error in comment compilation which are only interpolation
            }


<             $this->ignoreCallStackMessage = $ignoreCallStackMessage;
< 


            if ($pushEnv) {
                $this->popEnv();
            }
        }

        return $c;
    }

    /**
     * Compile root level comment
     *
     * @param array $block
     *
     * @return void
     */
    protected function compileComment($block)
    {
        $out = $this->makeOutputBlock(Type::T_COMMENT);
        $out->lines[] = $this->compileCommentValue($block, true);


>         assert($this->scope !== null);


        $this->scope->children[] = $out;
    }

    /**
     * Evaluate selectors
     *
     * @param array $selectors
     *
     * @return array
     */
    protected function evalSelectors($selectors)
    {
        $this->shouldEvaluate = false;


<         $selectors = array_map([$this, 'evalSelector'], $selectors);



>         $evaluatedSelectors = [];
>         foreach ($selectors as $selector) {
>             $evaluatedSelectors[] = $this->evalSelector($selector);
>         }
>         $selectors = $evaluatedSelectors;



        // after evaluating interpolates, we might need a second pass
        if ($this->shouldEvaluate) {
            $selectors = $this->replaceSelfSelector($selectors, '&');
            $buffer    = $this->collapseSelectors($selectors);
            $parser    = $this->parserFactory(__METHOD__);

            try {
                $isValid = $parser->parseSelector($buffer, $newSelectors, true);
            } catch (ParserException $e) {
                throw $this->error($e->getMessage());
            }

            if ($isValid) {
                $selectors = array_map([$this, 'evalSelector'], $newSelectors);
            }
        }

        return $selectors;
    }

    /**
     * Evaluate selector
     *
     * @param array $selector
     *
     * @return array

>      *
     */
>      * @phpstan-impure


    protected function evalSelector($selector)
    {
        return array_map([$this, 'evalSelectorPart'], $selector);
    }

    /**
     * Evaluate selector part; replaces all the interpolates, stripping quotes
     *
     * @param array $part
     *
     * @return array

>      *
     */
>      * @phpstan-impure


    protected function evalSelectorPart($part)
    {
        foreach ($part as &$p) {
            if (\is_array($p) && ($p[0] === Type::T_INTERPOLATE || $p[0] === Type::T_STRING)) {
                $p = $this->compileValue($p);

                // force re-evaluation if self char or non standard char
                if (preg_match(',[^\w-],', $p)) {
                    $this->shouldEvaluate = true;
                }
            } elseif (
                \is_string($p) && \strlen($p) >= 2 &&

<                 ($first = $p[0]) && ($first === '"' || $first === "'") &&
<                 substr($p, -1) === $first



>                 ($p[0] === '"' || $p[0] === "'") &&
>                 substr($p, -1) === $p[0]


            ) {
                $p = substr($p, 1, -1);
            }
        }

        return $this->flattenSelectorSingle($part);
    }

    /**
     * Collapse selectors
     *
     * @param array   $selectors

<      * @param boolean $selectorFormat
<      *   if false return a collapsed string
<      *   if true return an array description of a structured selector


     *
     * @return string
     */

<     protected function collapseSelectors($selectors, $selectorFormat = false)



>     protected function collapseSelectors($selectors)
>     {
>         $parts = [];
> 
>         foreach ($selectors as $selector) {
>             $output = [];
> 
>             foreach ($selector as $node) {
>                 $compound = '';
> 
>                 array_walk_recursive(
>                     $node,
>                     function ($value, $key) use (&$compound) {
>                         $compound .= $value;
>                     }
>                 );
> 
>                 $output[] = $compound;
>             }
> 
>             $parts[] = implode(' ', $output);
>         }
> 
>         return implode(', ', $parts);
>     }
> 
>     /**
>      * Collapse selectors
>      *
>      * @param array $selectors
>      *
>      * @return array
>      */
>     private function collapseSelectorsAsList($selectors)


    {
        $parts = [];

        foreach ($selectors as $selector) {
            $output = [];
            $glueNext = false;

            foreach ($selector as $node) {
                $compound = '';

                array_walk_recursive(
                    $node,
                    function ($value, $key) use (&$compound) {
                        $compound .= $value;
                    }
                );


<                 if ($selectorFormat && $this->isImmediateRelationshipCombinator($compound)) {



>                 if ($this->isImmediateRelationshipCombinator($compound)) {


                    if (\count($output)) {
                        $output[\count($output) - 1] .= ' ' . $compound;
                    } else {
                        $output[] = $compound;
                    }

                    $glueNext = true;
                } elseif ($glueNext) {
                    $output[\count($output) - 1] .= ' ' . $compound;
                    $glueNext = false;
                } else {
                    $output[] = $compound;
                }
            }


<             if ($selectorFormat) {


                foreach ($output as &$o) {
                    $o = [Type::T_STRING, '', [$o]];
                }


<                 $output = [Type::T_LIST, ' ', $output];
<             } else {
<                 $output = implode(' ', $output);
<             }
< 
<             $parts[] = $output;



>             $parts[] = [Type::T_LIST, ' ', $output];


        }


<         if ($selectorFormat) {
<             $parts = [Type::T_LIST, ',', $parts];
<         } else {
<             $parts = implode(', ', $parts);
<         }
< 
<         return $parts;



>         return [Type::T_LIST, ',', $parts];


    }

    /**
     * Parse down the selector and revert [self] to "&" before a reparsing
     *
     * @param array $selectors

>      * @param string|null $replace


     *
     * @return array
     */
    protected function replaceSelfSelector($selectors, $replace = null)
    {
        foreach ($selectors as &$part) {
            if (\is_array($part)) {
                if ($part === [Type::T_SELF]) {
                    if (\is_null($replace)) {
                        $replace = $this->reduce([Type::T_SELF]);
                        $replace = $this->compileValue($replace);
                    }
                    $part = $replace;
                } else {
                    $part = $this->replaceSelfSelector($part, $replace);
                }
            }
        }

        return $selectors;
    }

    /**
     * Flatten selector single; joins together .classes and #ids
     *
     * @param array $single
     *
     * @return array
     */
    protected function flattenSelectorSingle($single)
    {
        $joined = [];

        foreach ($single as $part) {
            if (
                empty($joined) ||
                ! \is_string($part) ||
                preg_match('/[\[.:#%]/', $part)
            ) {
                $joined[] = $part;
                continue;
            }

            if (\is_array(end($joined))) {
                $joined[] = $part;
            } else {
                $joined[\count($joined) - 1] .= $part;
            }
        }

        return $joined;
    }

    /**
     * Compile selector to string; self(&) should have been replaced by now
     *
     * @param string|array $selector
     *
     * @return string
     */
    protected function compileSelector($selector)
    {
        if (! \is_array($selector)) {
            return $selector; // media and the like
        }

        return implode(
            ' ',
            array_map(
                [$this, 'compileSelectorPart'],
                $selector
            )
        );
    }

    /**
     * Compile selector part
     *
     * @param array $piece
     *
     * @return string
     */
    protected function compileSelectorPart($piece)
    {
        foreach ($piece as &$p) {
            if (! \is_array($p)) {
                continue;
            }

            switch ($p[0]) {
                case Type::T_SELF:
                    $p = '&';
                    break;

                default:
                    $p = $this->compileValue($p);
                    break;
            }
        }

        return implode($piece);
    }

    /**
     * Has selector placeholder?
     *
     * @param array $selector
     *

<      * @return boolean



>      * @return bool


     */
    protected function hasSelectorPlaceholder($selector)
    {
        if (! \is_array($selector)) {
            return false;
        }

        foreach ($selector as $parts) {
            foreach ($parts as $part) {
                if (\strlen($part) && '%' === $part[0]) {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * @param string $name
     *
     * @return void
     */
    protected function pushCallStack($name = '')
    {
        $this->callStack[] = [
          'n' => $name,
          Parser::SOURCE_INDEX => $this->sourceIndex,
          Parser::SOURCE_LINE => $this->sourceLine,
          Parser::SOURCE_COLUMN => $this->sourceColumn
        ];

        // infinite calling loop
        if (\count($this->callStack) > 25000) {
            // not displayed but you can var_dump it to deep debug
            $msg = $this->callStackMessage(true, 100);
            $msg = 'Infinite calling loop';

            throw $this->error($msg);
        }
    }

    /**
     * @return void
     */
    protected function popCallStack()
    {
        array_pop($this->callStack);
    }

    /**
     * Compile children and return result
     *
     * @param array                                  $stms
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     * @param string                                 $traceName
     *

<      * @return array|null



>      * @return array|Number|null


     */
    protected function compileChildren($stms, OutputBlock $out, $traceName = '')
    {
        $this->pushCallStack($traceName);

        foreach ($stms as $stm) {
            $ret = $this->compileChild($stm, $out);

            if (isset($ret)) {
                $this->popCallStack();

                return $ret;
            }
        }

        $this->popCallStack();

        return null;
    }

    /**

<      * Compile children and throw exception if unexpected `@return`



>      * Compile children and throw exception if unexpected at-return


     *

<      * @param array                                  $stms



>      * @param array[]                                $stms


     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     * @param \ScssPhp\ScssPhp\Block                 $selfParent
     * @param string                                 $traceName
     *
     * @return void
     *
     * @throws \Exception
     */
    protected function compileChildrenNoReturn($stms, OutputBlock $out, $selfParent = null, $traceName = '')
    {
        $this->pushCallStack($traceName);

        foreach ($stms as $stm) {
            if ($selfParent && isset($stm[1]) && \is_object($stm[1]) && $stm[1] instanceof Block) {

>                 $oldSelfParent = $stm[1]->selfParent;


                $stm[1]->selfParent = $selfParent;
                $ret = $this->compileChild($stm, $out);

<                 $stm[1]->selfParent = null;
<             } elseif ($selfParent && \in_array($stm[0], [TYPE::T_INCLUDE, TYPE::T_EXTEND])) {



>                 $stm[1]->selfParent = $oldSelfParent;
>             } elseif ($selfParent && \in_array($stm[0], [Type::T_INCLUDE, Type::T_EXTEND])) {


                $stm['selfParent'] = $selfParent;
                $ret = $this->compileChild($stm, $out);

<                 unset($stm['selfParent']);


            } else {
                $ret = $this->compileChild($stm, $out);
            }

            if (isset($ret)) {
                throw $this->error('@return may only be used within a function');
            }
        }

        $this->popCallStack();
    }


    /**
     * evaluate media query : compile internal value keeping the structure unchanged
     *
     * @param array $queryList
     *
     * @return array
     */
    protected function evaluateMediaQuery($queryList)
    {
        static $parser = null;

        $outQueryList = [];

        foreach ($queryList as $kql => $query) {
            $shouldReparse = false;

            foreach ($query as $kq => $q) {
                for ($i = 1; $i < \count($q); $i++) {
                    $value = $this->compileValue($q[$i]);

                    // the parser had no mean to know if media type or expression if it was an interpolation
                    // so you need to reparse if the T_MEDIA_TYPE looks like anything else a media type
                    if (
                        $q[0] == Type::T_MEDIA_TYPE &&
                        (strpos($value, '(') !== false ||
                        strpos($value, ')') !== false ||
                        strpos($value, ':') !== false ||
                        strpos($value, ',') !== false)
                    ) {
                        $shouldReparse = true;
                    }

                    $queryList[$kql][$kq][$i] = [Type::T_KEYWORD, $value];
                }
            }

            if ($shouldReparse) {
                if (\is_null($parser)) {
                    $parser = $this->parserFactory(__METHOD__);
                }

                $queryString = $this->compileMediaQuery([$queryList[$kql]]);
                $queryString = reset($queryString);


<                 if (strpos($queryString, '@media ') === 0) {



>                 if ($queryString !== false && strpos($queryString, '@media ') === 0) {


                    $queryString = substr($queryString, 7);
                    $queries = [];

                    if ($parser->parseMediaQueryList($queryString, $queries)) {
                        $queries = $this->evaluateMediaQuery($queries[2]);

                        while (\count($queries)) {
                            $outQueryList[] = array_shift($queries);
                        }

                        continue;
                    }
                }
            }

            $outQueryList[] = $queryList[$kql];
        }

        return $outQueryList;
    }

    /**
     * Compile media query
     *
     * @param array $queryList
     *

<      * @return array



>      * @return string[]


     */
    protected function compileMediaQuery($queryList)
    {
        $start   = '@media ';
        $default = trim($start);
        $out     = [];
        $current = '';

        foreach ($queryList as $query) {
            $type = null;
            $parts = [];

            $mediaTypeOnly = true;

            foreach ($query as $q) {
                if ($q[0] !== Type::T_MEDIA_TYPE) {
                    $mediaTypeOnly = false;
                    break;
                }
            }

            foreach ($query as $q) {
                switch ($q[0]) {
                    case Type::T_MEDIA_TYPE:
                        $newType = array_map([$this, 'compileValue'], \array_slice($q, 1));

                        // combining not and anything else than media type is too risky and should be avoided
                        if (! $mediaTypeOnly) {
                            if (\in_array(Type::T_NOT, $newType) || ($type && \in_array(Type::T_NOT, $type) )) {
                                if ($type) {
                                    array_unshift($parts, implode(' ', array_filter($type)));
                                }

                                if (! empty($parts)) {
                                    if (\strlen($current)) {
                                        $current .= $this->formatter->tagSeparator;
                                    }

                                    $current .= implode(' and ', $parts);
                                }

                                if ($current) {
                                    $out[] = $start . $current;
                                }

                                $current = '';
                                $type    = null;
                                $parts   = [];
                            }
                        }

                        if ($newType === ['all'] && $default) {
                            $default = $start . 'all';
                        }

                        // all can be safely ignored and mixed with whatever else
                        if ($newType !== ['all']) {
                            if ($type) {
                                $type = $this->mergeMediaTypes($type, $newType);

                                if (empty($type)) {
                                    // merge failed : ignore this query that is not valid, skip to the next one
                                    $parts = [];
                                    $default = ''; // if everything fail, no @media at all
                                    continue 3;
                                }
                            } else {
                                $type = $newType;
                            }
                        }
                        break;

                    case Type::T_MEDIA_EXPRESSION:
                        if (isset($q[2])) {
                            $parts[] = '('
                                . $this->compileValue($q[1])
                                . $this->formatter->assignSeparator
                                . $this->compileValue($q[2])
                                . ')';
                        } else {
                            $parts[] = '('
                                . $this->compileValue($q[1])
                                . ')';
                        }
                        break;

                    case Type::T_MEDIA_VALUE:
                        $parts[] = $this->compileValue($q[1]);
                        break;
                }
            }

            if ($type) {
                array_unshift($parts, implode(' ', array_filter($type)));
            }

            if (! empty($parts)) {
                if (\strlen($current)) {
                    $current .= $this->formatter->tagSeparator;
                }

                $current .= implode(' and ', $parts);
            }
        }

        if ($current) {
            $out[] = $start . $current;
        }

        // no @media type except all, and no conflict?
        if (! $out && $default) {
            $out[] = $default;
        }

        return $out;
    }

    /**
     * Merge direct relationships between selectors
     *
     * @param array $selectors1
     * @param array $selectors2
     *
     * @return array
     */
    protected function mergeDirectRelationships($selectors1, $selectors2)
    {
        if (empty($selectors1) || empty($selectors2)) {
            return array_merge($selectors1, $selectors2);
        }

        $part1 = end($selectors1);
        $part2 = end($selectors2);

        if (! $this->isImmediateRelationshipCombinator($part1[0]) && $part1 !== $part2) {
            return array_merge($selectors1, $selectors2);
        }

        $merged = [];

        do {
            $part1 = array_pop($selectors1);
            $part2 = array_pop($selectors2);

            if (! $this->isImmediateRelationshipCombinator($part1[0]) && $part1 !== $part2) {
                if ($this->isImmediateRelationshipCombinator(reset($merged)[0])) {
                    array_unshift($merged, [$part1[0] . $part2[0]]);
                    $merged = array_merge($selectors1, $selectors2, $merged);
                } else {
                    $merged = array_merge($selectors1, [$part1], $selectors2, [$part2], $merged);
                }

                break;
            }

            array_unshift($merged, $part1);
        } while (! empty($selectors1) && ! empty($selectors2));

        return $merged;
    }

    /**
     * Merge media types
     *
     * @param array $type1
     * @param array $type2
     *
     * @return array|null
     */
    protected function mergeMediaTypes($type1, $type2)
    {
        if (empty($type1)) {
            return $type2;
        }

        if (empty($type2)) {
            return $type1;
        }

        if (\count($type1) > 1) {
            $m1 = strtolower($type1[0]);
            $t1 = strtolower($type1[1]);
        } else {
            $m1 = '';
            $t1 = strtolower($type1[0]);
        }

        if (\count($type2) > 1) {
            $m2 = strtolower($type2[0]);
            $t2 = strtolower($type2[1]);
        } else {
            $m2 = '';
            $t2 = strtolower($type2[0]);
        }

        if (($m1 === Type::T_NOT) ^ ($m2 === Type::T_NOT)) {
            if ($t1 === $t2) {
                return null;
            }

            return [
                $m1 === Type::T_NOT ? $m2 : $m1,
                $m1 === Type::T_NOT ? $t2 : $t1,
            ];
        }

        if ($m1 === Type::T_NOT && $m2 === Type::T_NOT) {
            // CSS has no way of representing "neither screen nor print"
            if ($t1 !== $t2) {
                return null;
            }

            return [Type::T_NOT, $t1];
        }

        if ($t1 !== $t2) {
            return null;
        }

        // t1 == t2, neither m1 nor m2 are "not"
        return [empty($m1) ? $m2 : $m1, $t1];
    }

    /**
     * Compile import; returns true if the value was something that could be imported
     *
     * @param array                                  $rawPath
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out

<      * @param boolean                                $once



>      * @param bool                                   $once


     *

<      * @return boolean



>      * @return bool


     */
    protected function compileImport($rawPath, OutputBlock $out, $once = false)
    {
        if ($rawPath[0] === Type::T_STRING) {
            $path = $this->compileStringContent($rawPath);


<             if (strpos($path, 'url(') !== 0 && $path = $this->findImport($path)) {
<                 if (! $once || ! \in_array($path, $this->importedFiles)) {
<                     $this->importFile($path, $out);
<                     $this->importedFiles[] = $path;



>             if (strpos($path, 'url(') !== 0 && $filePath = $this->findImport($path, $this->currentDirectory)) {
>                 $this->registerImport($this->currentDirectory, $path, $filePath);
> 
>                 if (! $once || ! \in_array($filePath, $this->importedFiles)) {
>                     $this->importFile($filePath, $out);
>                     $this->importedFiles[] = $filePath;


                }

                return true;
            }

            $this->appendRootDirective('@import ' . $this->compileImportPath($rawPath) . ';', $out);

            return false;
        }

        if ($rawPath[0] === Type::T_LIST) {
            // handle a list of strings
            if (\count($rawPath[2]) === 0) {
                return false;
            }

            foreach ($rawPath[2] as $path) {
                if ($path[0] !== Type::T_STRING) {
                    $this->appendRootDirective('@import ' . $this->compileImportPath($rawPath) . ';', $out);

                    return false;
                }
            }

            foreach ($rawPath[2] as $path) {
                $this->compileImport($path, $out, $once);
            }

            return true;
        }

        $this->appendRootDirective('@import ' . $this->compileImportPath($rawPath) . ';', $out);

        return false;
    }

    /**
     * @param array $rawPath
     * @return string
     * @throws CompilerException
     */
    protected function compileImportPath($rawPath)
    {
        $path = $this->compileValue($rawPath);

        // case url() without quotes : suppress \r \n remaining in the path
        // if this is a real string there can not be CR or LF char
        if (strpos($path, 'url(') === 0) {
            $path = str_replace(array("\r", "\n"), array('', ' '), $path);
        } else {
            // if this is a file name in a string, spaces should be escaped
            $path = $this->reduce($rawPath);
            $path = $this->escapeImportPathString($path);
            $path = $this->compileValue($path);
        }

        return $path;
    }

    /**
     * @param array $path
     * @return array
     * @throws CompilerException
     */
    protected function escapeImportPathString($path)
    {
        switch ($path[0]) {
            case Type::T_LIST:
                foreach ($path[2] as $k => $v) {
                    $path[2][$k] = $this->escapeImportPathString($v);
                }
                break;
            case Type::T_STRING:
                if ($path[1]) {
                    $path = $this->compileValue($path);
                    $path = str_replace(' ', '\\ ', $path);
                    $path = [Type::T_KEYWORD, $path];
                }
                break;
        }

        return $path;
    }

    /**
     * Append a root directive like @import or @charset as near as the possible from the source code
     * (keeping before comments, @import and @charset coming before in the source code)
     *
     * @param string                                 $line
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     * @param array                                  $allowed
     *
     * @return void
     */
    protected function appendRootDirective($line, $out, $allowed = [Type::T_COMMENT])
    {
        $root = $out;

        while ($root->parent) {
            $root = $root->parent;
        }

        $i = 0;

        while ($i < \count($root->children)) {
            if (! isset($root->children[$i]->type) || ! \in_array($root->children[$i]->type, $allowed)) {
                break;
            }

            $i++;
        }

        // remove incompatible children from the bottom of the list
        $saveChildren = [];

        while ($i < \count($root->children)) {
            $saveChildren[] = array_pop($root->children);
        }

        // insert the directive as a comment
        $child = $this->makeOutputBlock(Type::T_COMMENT);
        $child->lines[]      = $line;

<         $child->sourceName   = $this->sourceNames[$this->sourceIndex];



>         $child->sourceName   = $this->sourceNames[$this->sourceIndex] ?: '(stdin)';


        $child->sourceLine   = $this->sourceLine;
        $child->sourceColumn = $this->sourceColumn;

        $root->children[] = $child;

        // repush children
        while (\count($saveChildren)) {
            $root->children[] = array_pop($saveChildren);
        }
    }

    /**
     * Append lines to the current output block:
     * directly to the block or through a child if necessary
     *
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     * @param string                                 $type

<      * @param string|mixed                           $line



>      * @param string                                 $line


     *
     * @return void
     */
    protected function appendOutputLine(OutputBlock $out, $type, $line)
    {
        $outWrite = &$out;

        // check if it's a flat output or not
        if (\count($out->children)) {
            $lastChild = &$out->children[\count($out->children) - 1];

            if (
                $lastChild->depth === $out->depth &&
                \is_null($lastChild->selectors) &&
                ! \count($lastChild->children)
            ) {
                $outWrite = $lastChild;
            } else {
                $nextLines = $this->makeOutputBlock($type);
                $nextLines->parent = $out;
                $nextLines->depth  = $out->depth;

                $out->children[] = $nextLines;
                $outWrite = &$nextLines;
            }
        }

        $outWrite->lines[] = $line;
    }

    /**
     * Compile child; returns a value to halt execution
     *
     * @param array                                  $child
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     *
     * @return array|Number|null
     */
    protected function compileChild($child, OutputBlock $out)
    {
        if (isset($child[Parser::SOURCE_LINE])) {
            $this->sourceIndex  = isset($child[Parser::SOURCE_INDEX]) ? $child[Parser::SOURCE_INDEX] : null;
            $this->sourceLine   = isset($child[Parser::SOURCE_LINE]) ? $child[Parser::SOURCE_LINE] : -1;
            $this->sourceColumn = isset($child[Parser::SOURCE_COLUMN]) ? $child[Parser::SOURCE_COLUMN] : -1;

<         } elseif (\is_array($child) && isset($child[1]->sourceLine)) {



>         } elseif (\is_array($child) && isset($child[1]->sourceLine) && $child[1] instanceof Block) {


            $this->sourceIndex  = $child[1]->sourceIndex;
            $this->sourceLine   = $child[1]->sourceLine;
            $this->sourceColumn = $child[1]->sourceColumn;
        } elseif (! empty($out->sourceLine) && ! empty($out->sourceName)) {
            $this->sourceLine   = $out->sourceLine;

<             $this->sourceIndex  = array_search($out->sourceName, $this->sourceNames);



>             $sourceIndex  = array_search($out->sourceName, $this->sourceNames);


            $this->sourceColumn = $out->sourceColumn;


<             if ($this->sourceIndex === false) {
<                 $this->sourceIndex = null;



>             if ($sourceIndex === false) {
>                 $sourceIndex = null;


            }

>             $this->sourceIndex = $sourceIndex;


        }

        switch ($child[0]) {
            case Type::T_SCSSPHP_IMPORT_ONCE:
                $rawPath = $this->reduce($child[1]);

                $this->compileImport($rawPath, $out, true);
                break;

            case Type::T_IMPORT:
                $rawPath = $this->reduce($child[1]);

                $this->compileImport($rawPath, $out);
                break;

            case Type::T_DIRECTIVE:
                $this->compileDirective($child[1], $out);
                break;

            case Type::T_AT_ROOT:
                $this->compileAtRoot($child[1]);
                break;

            case Type::T_MEDIA:
                $this->compileMedia($child[1]);
                break;

            case Type::T_BLOCK:
                $this->compileBlock($child[1]);
                break;

            case Type::T_CHARSET:

<                 if (! $this->charsetSeen) {
<                     $this->charsetSeen = true;
<                     $this->appendRootDirective('@charset ' . $this->compileValue($child[1]) . ';', $out);
<                 }


                break;

            case Type::T_CUSTOM_PROPERTY:
                list(, $name, $value) = $child;
                $compiledName = $this->compileValue($name);

                // if the value reduces to null from something else then
                // the property should be discarded
                if ($value[0] !== Type::T_NULL) {
                    $value = $this->reduce($value);

                    if ($value[0] === Type::T_NULL || $value === static::$nullString) {
                        break;
                    }
                }

                $compiledValue = $this->compileValue($value);

                $line = $this->formatter->customProperty(
                    $compiledName,
                    $compiledValue
                );

                $this->appendOutputLine($out, Type::T_ASSIGN, $line);
                break;

            case Type::T_ASSIGN:
                list(, $name, $value) = $child;

                if ($name[0] === Type::T_VARIABLE) {
                    $flags     = isset($child[3]) ? $child[3] : [];
                    $isDefault = \in_array('!default', $flags);
                    $isGlobal  = \in_array('!global', $flags);

                    if ($isGlobal) {
                        $this->set($name[1], $this->reduce($value), false, $this->rootEnv, $value);
                        break;
                    }

                    $shouldSet = $isDefault &&
                        (\is_null($result = $this->get($name[1], false)) ||
                        $result === static::$null);

                    if (! $isDefault || $shouldSet) {
                        $this->set($name[1], $this->reduce($value), true, null, $value);
                    }
                    break;
                }

                $compiledName = $this->compileValue($name);

                // handle shorthand syntaxes : size / line-height...
                if (\in_array($compiledName, ['font', 'grid-row', 'grid-column', 'border-radius'])) {
                    if ($value[0] === Type::T_VARIABLE) {
                        // if the font value comes from variable, the content is already reduced
                        // (i.e., formulas were already calculated), so we need the original unreduced value
                        $value = $this->get($value[1], true, null, true);
                    }

                    $shorthandValue=&$value;

                    $shorthandDividerNeedsUnit = false;
                    $maxListElements           = null;
                    $maxShorthandDividers      = 1;

                    switch ($compiledName) {
                        case 'border-radius':
                            $maxListElements = 4;
                            $shorthandDividerNeedsUnit = true;
                            break;
                    }

                    if ($compiledName === 'font' && $value[0] === Type::T_LIST && $value[1] === ',') {
                        // this is the case if more than one font is given: example: "font: 400 1em/1.3 arial,helvetica"
                        // we need to handle the first list element
                        $shorthandValue=&$value[2][0];
                    }

                    if ($shorthandValue[0] === Type::T_EXPRESSION && $shorthandValue[1] === '/') {
                        $revert = true;

                        if ($shorthandDividerNeedsUnit) {
                            $divider = $shorthandValue[3];

                            if (\is_array($divider)) {
                                $divider = $this->reduce($divider, true);
                            }

                            if ($divider instanceof Number && \intval($divider->getDimension()) && $divider->unitless()) {
                                $revert = false;
                            }
                        }

                        if ($revert) {
                            $shorthandValue = $this->expToString($shorthandValue);
                        }
                    } elseif ($shorthandValue[0] === Type::T_LIST) {
                        foreach ($shorthandValue[2] as &$item) {
                            if ($item[0] === Type::T_EXPRESSION && $item[1] === '/') {
                                if ($maxShorthandDividers > 0) {
                                    $revert = true;

                                    // if the list of values is too long, this has to be a shorthand,
                                    // otherwise it could be a real division
                                    if (\is_null($maxListElements) || \count($shorthandValue[2]) <= $maxListElements) {
                                        if ($shorthandDividerNeedsUnit) {
                                            $divider = $item[3];

                                            if (\is_array($divider)) {
                                                $divider = $this->reduce($divider, true);
                                            }

                                            if ($divider instanceof Number && \intval($divider->getDimension()) && $divider->unitless()) {
                                                $revert = false;
                                            }
                                        }
                                    }

                                    if ($revert) {
                                        $item = $this->expToString($item);
                                        $maxShorthandDividers--;
                                    }
                                }
                            }
                        }
                    }
                }

                // if the value reduces to null from something else then
                // the property should be discarded
                if ($value[0] !== Type::T_NULL) {
                    $value = $this->reduce($value);

                    if ($value[0] === Type::T_NULL || $value === static::$nullString) {
                        break;
                    }
                }

                $compiledValue = $this->compileValue($value);

                // ignore empty value
                if (\strlen($compiledValue)) {
                    $line = $this->formatter->property(
                        $compiledName,
                        $compiledValue
                    );
                    $this->appendOutputLine($out, Type::T_ASSIGN, $line);
                }
                break;

            case Type::T_COMMENT:
                if ($out->type === Type::T_ROOT) {
                    $this->compileComment($child);
                    break;
                }

                $line = $this->compileCommentValue($child, true);
                $this->appendOutputLine($out, Type::T_COMMENT, $line);
                break;

            case Type::T_MIXIN:
            case Type::T_FUNCTION:
                list(, $block) = $child;

>                 assert($block instanceof CallableBlock);


                // the block need to be able to go up to it's parent env to resolve vars
                $block->parentEnv = $this->getStoreEnv();
                $this->set(static::$namespaces[$block->type] . $block->name, $block, true);
                break;

            case Type::T_EXTEND:
                foreach ($child[1] as $sel) {

<                     $sel = $this->replaceSelfSelector($sel);



>                     $replacedSel = $this->replaceSelfSelector($sel);
> 
>                     if ($replacedSel !== $sel) {
>                         throw $this->error('Parent selectors aren\'t allowed here.');
>                     }
> 


                    $results = $this->evalSelectors([$sel]);

                    foreach ($results as $result) {

>                         if (\count($result) !== 1) {
                        // only use the first one
>                             throw $this->error('complex selectors may not be extended.');
                        $result = current($result);
>                         }
                        $selectors = $out->selectors;
> 



<                         $result = current($result);



>                         $result = $result[0];


                        if (! $selectors && isset($child['selfParent'])) {
                            $selectors = $this->multiplySelectors($this->env, $child['selfParent']);
                        }

>                         assert($selectors !== null);

> 
                        $this->pushExtends($result, $selectors, $child);
>                         if (\count($result) > 1) {
                    }
>                             $replacement = implode(', ', $result);
                }
>                             $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
                break;
>                             $line = $this->sourceLine;

> 
            case Type::T_IF:
>                             $message = <<<EOL
                list(, $if) = $child;
> on line $line of $fname:

> Compound selectors may no longer be extended.
                if ($this->isTruthy($this->reduce($if->cond, true))) {
> Consider `@extend $replacement` instead.
                    return $this->compileChildren($if->children, $out);
> See http://bit.ly/ExtendCompound for details.
                }
> EOL;

> 
                foreach ($if->cases as $case) {
>                             $this->logger->warn($message);
                    if (
>                         }


                        $case->type === Type::T_ELSE ||

>                 assert($if instanceof IfBlock);



<                         $case->type === Type::T_ELSE ||
<                         $case->type === Type::T_ELSEIF && $this->isTruthy($this->reduce($case->cond))



>                         $case instanceof ElseBlock ||
>                         $case instanceof ElseifBlock && $this->isTruthy($this->reduce($case->cond))


                        return $this->compileChildren($case->children, $out);
                    }
                }
                break;

            case Type::T_EACH:
                list(, $each) = $child;

>                 assert($each instanceof EachBlock);



                $list = $this->coerceList($this->reduce($each->list), ',', true);

                $this->pushEnv();

                foreach ($list[2] as $item) {
                    if (\count($each->vars) === 1) {
                        $this->set($each->vars[0], $item, true);
                    } else {
                        list(,, $values) = $this->coerceList($item);

                        foreach ($each->vars as $i => $var) {
                            $this->set($var, isset($values[$i]) ? $values[$i] : static::$null, true);
                        }
                    }

                    $ret = $this->compileChildren($each->children, $out);

                    if ($ret) {
                        $store = $this->env->store;
                        $this->popEnv();
                        $this->backPropagateEnv($store, $each->vars);

                        return $ret;
                    }
                }
                $store = $this->env->store;
                $this->popEnv();
                $this->backPropagateEnv($store, $each->vars);

                break;

            case Type::T_WHILE:
                list(, $while) = $child;

>                 assert($while instanceof WhileBlock);



                while ($this->isTruthy($this->reduce($while->cond, true))) {
                    $ret = $this->compileChildren($while->children, $out);

                    if ($ret) {
                        return $ret;
                    }
                }
                break;

            case Type::T_FOR:
                list(, $for) = $child;

>                 assert($for instanceof ForBlock);




<                 $start = $this->reduce($for->start, true);
<                 $end   = $this->reduce($for->end, true);
< 
<                 if (! $start instanceof Number) {
<                     throw $this->error('%s is not a number', $start[0]);
<                 }
< 
<                 if (! $end instanceof Number) {
<                     throw $this->error('%s is not a number', $end[0]);
<                 }



>                 $startNumber = $this->assertNumber($this->reduce($for->start, true));
>                 $endNumber = $this->assertNumber($this->reduce($for->end, true));




<                 $start->assertSameUnitOrUnitless($end);



>                 $start = $this->assertInteger($startNumber);




<                 $numeratorUnits = $start->getNumeratorUnits();
<                 $denominatorUnits = $start->getDenominatorUnits();



>                 $numeratorUnits = $startNumber->getNumeratorUnits();
>                 $denominatorUnits = $startNumber->getDenominatorUnits();




<                 $start = $start->getDimension();
<                 $end   = $end->getDimension();



>                 $end = $this->assertInteger($endNumber->coerce($numeratorUnits, $denominatorUnits));



                $d = $start < $end ? 1 : -1;

                $this->pushEnv();

                for (;;) {
                    if (
                        (! $for->until && $start - $d == $end) ||
                        ($for->until && $start == $end)
                    ) {
                        break;
                    }

                    $this->set($for->var, new Number($start, $numeratorUnits, $denominatorUnits));
                    $start += $d;

                    $ret = $this->compileChildren($for->children, $out);

                    if ($ret) {
                        $store = $this->env->store;
                        $this->popEnv();
                        $this->backPropagateEnv($store, [$for->var]);

                        return $ret;
                    }
                }

                $store = $this->env->store;
                $this->popEnv();
                $this->backPropagateEnv($store, [$for->var]);

                break;

            case Type::T_RETURN:
                return $this->reduce($child[1], true);

            case Type::T_NESTED_PROPERTY:
                $this->compileNestedPropertiesBlock($child[1], $out);
                break;

            case Type::T_INCLUDE:
                // including a mixin
                list(, $name, $argValues, $content, $argUsing) = $child;

                $mixin = $this->get(static::$namespaces['mixin'] . $name, false);

                if (! $mixin) {
                    throw $this->error("Undefined mixin $name");
                }


>                 assert($mixin instanceof CallableBlock);
                $callingScope = $this->getStoreEnv();
> 



                // push scope, apply args
                $this->pushEnv();
                $this->env->depth--;

                // Find the parent selectors in the env to be able to know what '&' refers to in the mixin
                // and assign this fake parent to childs
                $selfParent = null;


<                 if (isset($child['selfParent']) && isset($child['selfParent']->selectors)) {



>                 if (isset($child['selfParent']) && $child['selfParent'] instanceof Block && isset($child['selfParent']->selectors)) {


                    $selfParent = $child['selfParent'];
                } else {
                    $parentSelectors = $this->multiplySelectors($this->env);

                    if ($parentSelectors) {
                        $parent = new Block();
                        $parent->selectors = $parentSelectors;

                        foreach ($mixin->children as $k => $child) {

<                             if (isset($child[1]) && \is_object($child[1]) && $child[1] instanceof Block) {



>                             if (isset($child[1]) && $child[1] instanceof Block) {


                                $mixin->children[$k][1]->parent = $parent;
                            }
                        }
                    }
                }

                // clone the stored content to not have its scope spoiled by a further call to the same mixin
                // i.e., recursive @include of the same mixin
                if (isset($content)) {
                    $copyContent = clone $content;
                    $copyContent->scope = clone $callingScope;

                    $this->setRaw(static::$namespaces['special'] . 'content', $copyContent, $this->env);
                } else {
                    $this->setRaw(static::$namespaces['special'] . 'content', null, $this->env);
                }

                // save the "using" argument list for applying it to when "@content" is invoked
                if (isset($argUsing)) {
                    $this->setRaw(static::$namespaces['special'] . 'using', $argUsing, $this->env);
                } else {
                    $this->setRaw(static::$namespaces['special'] . 'using', null, $this->env);
                }

                if (isset($mixin->args)) {
                    $this->applyArguments($mixin->args, $argValues);
                }

                $this->env->marker = 'mixin';

                if (! empty($mixin->parentEnv)) {
                    $this->env->declarationScopeParent = $mixin->parentEnv;
                } else {
                    throw $this->error("@mixin $name() without parentEnv");
                }

                $this->compileChildrenNoReturn($mixin->children, $out, $selfParent, $this->env->marker . ' ' . $name);

                $this->popEnv();
                break;

            case Type::T_MIXIN_CONTENT:
                $env        = isset($this->storeEnv) ? $this->storeEnv : $this->env;
                $content    = $this->get(static::$namespaces['special'] . 'content', false, $env);
                $argUsing   = $this->get(static::$namespaces['special'] . 'using', false, $env);
                $argContent = $child[1];

                if (! $content) {
                    break;
                }

                $storeEnv = $this->storeEnv;
                $varsUsing = [];

                if (isset($argUsing) && isset($argContent)) {
                    // Get the arguments provided for the content with the names provided in the "using" argument list
                    $this->storeEnv = null;
                    $varsUsing = $this->applyArguments($argUsing, $argContent, false);
                }

                // restore the scope from the @content
                $this->storeEnv = $content->scope;

                // append the vars from using if any
                foreach ($varsUsing as $name => $val) {
                    $this->set($name, $val, true, $this->storeEnv);
                }

                $this->compileChildrenNoReturn($content->children, $out);

                $this->storeEnv = $storeEnv;
                break;

            case Type::T_DEBUG:
                list(, $value) = $child;

                $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
                $line  = $this->sourceLine;
                $value = $this->compileDebugValue($value);


<                 fwrite($this->stderr, "$fname:$line DEBUG: $value\n");



>                 $this->logger->debug("$fname:$line DEBUG: $value");


                break;

            case Type::T_WARN:
                list(, $value) = $child;

                $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
                $line  = $this->sourceLine;
                $value = $this->compileDebugValue($value);


<                 fwrite($this->stderr, "WARNING: $value\n         on line $line of $fname\n\n");



>                 $this->logger->warn("$value\n         on line $line of $fname");


                break;

            case Type::T_ERROR:
                list(, $value) = $child;

                $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
                $line  = $this->sourceLine;
                $value = $this->compileValue($this->reduce($value, true));

                throw $this->error("File $fname on line $line ERROR: $value\n");

            default:
                throw $this->error("unknown child type: $child[0]");
        }

> 
    }
>         return null;



    /**
     * Reduce expression to string
     *
     * @param array $exp
     * @param bool $keepParens
     *
     * @return array
     */
    protected function expToString($exp, $keepParens = false)
    {
        list(, $op, $left, $right, $inParens, $whiteLeft, $whiteRight) = $exp;

        $content = [];

        if ($keepParens && $inParens) {
            $content[] = '(';
        }

        $content[] = $this->reduce($left);

        if ($whiteLeft) {
            $content[] = ' ';
        }

        $content[] = $op;

        if ($whiteRight) {
            $content[] = ' ';
        }

        $content[] = $this->reduce($right);

        if ($keepParens && $inParens) {
            $content[] = ')';
        }

        return [Type::T_STRING, '', $content];
    }

    /**
     * Is truthy?
     *
     * @param array|Number $value
     *

<      * @return boolean



>      * @return bool


     */

<     protected function isTruthy($value)



>     public function isTruthy($value)


    {
        return $value !== static::$false && $value !== static::$null;
    }

    /**
     * Is the value a direct relationship combinator?
     *
     * @param string $value
     *

<      * @return boolean



>      * @return bool


     */
    protected function isImmediateRelationshipCombinator($value)
    {
        return $value === '>' || $value === '+' || $value === '~';
    }

    /**
     * Should $value cause its operand to eval
     *
     * @param array $value
     *

<      * @return boolean



>      * @return bool


     */
    protected function shouldEval($value)
    {
        switch ($value[0]) {
            case Type::T_EXPRESSION:
                if ($value[1] === '/') {
                    return $this->shouldEval($value[2]) || $this->shouldEval($value[3]);
                }

                // fall-thru
            case Type::T_VARIABLE:
            case Type::T_FUNCTION_CALL:
                return true;
        }

        return false;
    }

    /**
     * Reduce value
     *
     * @param array|Number $value

<      * @param boolean $inExp



>      * @param bool         $inExp


     *

<      * @return null|string|array|Number



>      * @return array|Number


     */
    protected function reduce($value, $inExp = false)
    {

<         if (\is_null($value)) {
<             return null;



>         if ($value instanceof Number) {
>             return $value;


        }

        switch ($value[0]) {
            case Type::T_EXPRESSION:
                list(, $op, $left, $right, $inParens) = $value;

                $opName = isset(static::$operatorNames[$op]) ? static::$operatorNames[$op] : $op;
                $inExp = $inExp || $this->shouldEval($left) || $this->shouldEval($right);

                $left = $this->reduce($left, true);

                if ($op !== 'and' && $op !== 'or') {
                    $right = $this->reduce($right, true);
                }

                // special case: looks like css shorthand
                if (
                    $opName == 'div' && ! $inParens && ! $inExp &&
                    (($right[0] !== Type::T_NUMBER && isset($right[2]) && $right[2] != '') ||
                    ($right[0] === Type::T_NUMBER && ! $right->unitless()))
                ) {
                    return $this->expToString($value);
                }

                $left  = $this->coerceForExpression($left);
                $right = $this->coerceForExpression($right);
                $ltype = $left[0];
                $rtype = $right[0];

                $ucOpName = ucfirst($opName);
                $ucLType  = ucfirst($ltype);
                $ucRType  = ucfirst($rtype);


>                 $shouldEval = $inParens || $inExp;
                // this tries:
> 


                // 1. op[op name][left type][right type]

<                 // 2. op[left type][right type] (passing the op as first arg



>                 // 2. op[left type][right type] (passing the op as first arg)


                // 3. op[op name]

<                 $fn = "op${ucOpName}${ucLType}${ucRType}";
< 
<                 if (
<                     \is_callable([$this, $fn]) ||
<                     (($fn = "op${ucLType}${ucRType}") &&
<                         \is_callable([$this, $fn]) &&
<                         $passOp = true) ||
<                     (($fn = "op${ucOpName}") &&
<                         \is_callable([$this, $fn]) &&
<                         $genOp = true)
<                 ) {
<                     $shouldEval = $inParens || $inExp;
< 
<                     if (isset($passOp)) {



>                 if (\is_callable([$this, $fn = "op{$ucOpName}{$ucLType}{$ucRType}"])) {
>                     $out = $this->$fn($left, $right, $shouldEval);
>                 } elseif (\is_callable([$this, $fn = "op{$ucLType}{$ucRType}"])) {


                        $out = $this->$fn($op, $left, $right, $shouldEval);

<                     } else {



>                 } elseif (\is_callable([$this, $fn = "op{$ucOpName}"])) {


                        $out = $this->$fn($left, $right, $shouldEval);

>                 } else {
                    }
>                     $out = null;



                    if (isset($out)) {
                        return $out;
                    }

<                 }



                return $this->expToString($value);

            case Type::T_UNARY:
                list(, $op, $exp, $inParens) = $value;

                $inExp = $inExp || $this->shouldEval($exp);
                $exp = $this->reduce($exp);

                if ($exp instanceof Number) {
                    switch ($op) {
                        case '+':
                            return $exp;

                        case '-':
                            return $exp->unaryMinus();
                    }
                }

                if ($op === 'not') {
                    if ($inExp || $inParens) {
                        if ($exp === static::$false || $exp === static::$null) {
                            return static::$true;
                        }

                        return static::$false;
                    }

                    $op = $op . ' ';
                }

                return [Type::T_STRING, '', [$op, $exp]];

            case Type::T_VARIABLE:
                return $this->reduce($this->get($value[1]));

            case Type::T_LIST:
                foreach ($value[2] as &$item) {
                    $item = $this->reduce($item);
                }

>                 unset($item);

> 
                return $value;
>                 if (isset($value[3]) && \is_array($value[3])) {

>                     foreach ($value[3] as &$item) {
            case Type::T_MAP:
>                         $item = $this->reduce($item);
                foreach ($value[1] as &$item) {
>                     }
                    $item = $this->reduce($item);
>                     unset($item);
                }
>                 }



                foreach ($value[2] as &$item) {
                    $item = $this->reduce($item);
                }

                return $value;

            case Type::T_STRING:
                foreach ($value[2] as &$item) {

<                     if (\is_array($item) || $item instanceof \ArrayAccess) {



>                     if (\is_array($item) || $item instanceof Number) {


                        $item = $this->reduce($item);
                    }
                }

                return $value;

            case Type::T_INTERPOLATE:
                $value[1] = $this->reduce($value[1]);

                if ($inExp) {

<                     return $value[1];



>                     return [Type::T_KEYWORD, $this->compileValue($value, false)];


                }

                return $value;

            case Type::T_FUNCTION_CALL:
                return $this->fncall($value[1], $value[2]);

            case Type::T_SELF:
                $selfParent = ! empty($this->env->block->selfParent) ? $this->env->block->selfParent : null;
                $selfSelector = $this->multiplySelectors($this->env, $selfParent);

<                 $selfSelector = $this->collapseSelectors($selfSelector, true);



>                 $selfSelector = $this->collapseSelectorsAsList($selfSelector);



                return $selfSelector;

            default:
                return $value;
        }
    }

    /**
     * Function caller
     *

<      * @param string $name



>      * @param string|array $functionReference


     * @param array  $argValues
     *
     * @return array|Number
     */
    protected function fncall($functionReference, $argValues)
    {
        // a string means this is a static hard reference coming from the parsing
        if (is_string($functionReference)) {
            $name = $functionReference;

            $functionReference = $this->getFunctionReference($name);
            if ($functionReference === static::$null || $functionReference[0] !== Type::T_FUNCTION_REFERENCE) {
                $functionReference = [Type::T_FUNCTION, $name, [Type::T_LIST, ',', []]];
            }
        }

        // a function type means we just want a plain css function call
        if ($functionReference[0] === Type::T_FUNCTION) {
            // for CSS functions, simply flatten the arguments into a list
            $listArgs = [];

            foreach ((array) $argValues as $arg) {
                if (empty($arg[0]) || count($argValues) === 1) {
                    $listArgs[] = $this->reduce($this->stringifyFncallArgs($arg[1]));
                }
            }

            return [Type::T_FUNCTION, $functionReference[1], [Type::T_LIST, ',', $listArgs]];
        }

        if ($functionReference === static::$null || $functionReference[0] !== Type::T_FUNCTION_REFERENCE) {
            return static::$defaultValue;
        }


        switch ($functionReference[1]) {
            // SCSS @function
            case 'scss':
                return $this->callScssFunction($functionReference[3], $argValues);

            // native PHP functions
            case 'user':
            case 'native':
                list(,,$name, $fn, $prototype) = $functionReference;

                // special cases of css valid functions min/max
                $name = strtolower($name);

<                 if (\in_array($name, ['min', 'max'])) {



>                 if (\in_array($name, ['min', 'max']) && count($argValues) >= 1) {


                    $cssFunction = $this->cssValidArg(
                        [Type::T_FUNCTION_CALL, $name, $argValues],
                        ['min', 'max', 'calc', 'env', 'var']
                    );
                    if ($cssFunction !== false) {
                        return $cssFunction;
                    }
                }
                $returnValue = $this->callNativeFunction($name, $fn, $prototype, $argValues);

                if (! isset($returnValue)) {
                    return $this->fncall([Type::T_FUNCTION, $name, [Type::T_LIST, ',', []]], $argValues);
                }

                return $returnValue;

            default:
                return static::$defaultValue;
        }
    }


>     /**
    protected function cssValidArg($arg, $allowed_function = [], $inFunction = false)
>      * @param array|Number $arg
    {
>      * @param string[]     $allowed_function
        switch ($arg[0]) {
>      * @param bool         $inFunction
            case Type::T_INTERPOLATE:
>      *
                return [Type::T_KEYWORD, $this->CompileValue($arg)];
>      * @return array|Number|false

>      */


            case Type::T_FUNCTION:

>         if ($arg instanceof Number) {
                if (! \in_array($arg[1], $allowed_function)) {
>             return $this->stringifyFncallArgs($arg);
                    return false;
>         }
                }
> 


                if ($arg[2][0] === Type::T_LIST) {
                    foreach ($arg[2][2] as $k => $subarg) {
                        $arg[2][2][$k] = $this->cssValidArg($subarg, $allowed_function, $arg[1]);
                        if ($arg[2][2][$k] === false) {
                            return false;
                        }
                    }
                }
                return $arg;

            case Type::T_FUNCTION_CALL:
                if (! \in_array($arg[1], $allowed_function)) {
                    return false;
                }
                $cssArgs = [];
                foreach ($arg[2] as $argValue) {
                    if ($argValue === static::$null) {
                        return false;
                    }
                    $cssArg = $this->cssValidArg($argValue[1], $allowed_function, $arg[1]);
                    if (empty($argValue[0]) && $cssArg !== false) {
                        $cssArgs[] = [$argValue[0], $cssArg];
                    } else {
                        return false;
                    }
                }

                return $this->fncall([Type::T_FUNCTION, $arg[1], [Type::T_LIST, ',', []]], $cssArgs);

            case Type::T_STRING:
            case Type::T_KEYWORD:
                if (!$inFunction or !\in_array($inFunction, ['calc', 'env', 'var'])) {
                    return false;
                }
                return $this->stringifyFncallArgs($arg);


<             case Type::T_NUMBER:
<                 return $this->stringifyFncallArgs($arg);
< 


            case Type::T_LIST:
                if (!$inFunction) {
                    return false;
                }
                if (empty($arg['enclosing']) and $arg[1] === '') {
                    foreach ($arg[2] as $k => $subarg) {
                        $arg[2][$k] = $this->cssValidArg($subarg, $allowed_function, $inFunction);
                        if ($arg[2][$k] === false) {
                            return false;
                        }
                    }
                    $arg[0] = Type::T_STRING;
                    return $arg;
                }
                return false;

            case Type::T_EXPRESSION:
                if (! \in_array($arg[1], ['+', '-', '/', '*'])) {
                    return false;
                }
                $arg[2] = $this->cssValidArg($arg[2], $allowed_function, $inFunction);
                $arg[3] = $this->cssValidArg($arg[3], $allowed_function, $inFunction);
                if ($arg[2] === false || $arg[3] === false) {
                    return false;
                }
                return $this->expToString($arg, true);

            case Type::T_VARIABLE:
            case Type::T_SELF:
            default:
                return false;
        }
    }


    /**
     * Reformat fncall arguments to proper css function output
     *

<      * @param $arg



>      * @param array|Number $arg


     *

<      * @return array|\ArrayAccess|Number|string|null



>      * @return array|Number


     */
    protected function stringifyFncallArgs($arg)
    {

>         if ($arg instanceof Number) {

>             return $arg;
        switch ($arg[0]) {
>         }


            case Type::T_LIST:
                foreach ($arg[2] as $k => $v) {
                    $arg[2][$k] = $this->stringifyFncallArgs($v);
                }
                break;

            case Type::T_EXPRESSION:
                if ($arg[1] === '/') {
                    $arg[2] = $this->stringifyFncallArgs($arg[2]);
                    $arg[3] = $this->stringifyFncallArgs($arg[3]);
                    $arg[5] = $arg[6] = false; // no space around /
                    $arg = $this->expToString($arg);
                }
                break;

            case Type::T_FUNCTION_CALL:
                $name = strtolower($arg[1]);

                if (in_array($name, ['max', 'min', 'calc'])) {
                    $args = $arg[2];
                    $arg = $this->fncall([Type::T_FUNCTION, $name, [Type::T_LIST, ',', []]], $args);
                }
                break;
        }

        return $arg;
    }

    /**
     * Find a function reference
     * @param string $name
     * @param bool $safeCopy
     * @return array
     */
    protected function getFunctionReference($name, $safeCopy = false)
    {
        // SCSS @function
        if ($func = $this->get(static::$namespaces['function'] . $name, false)) {
            if ($safeCopy) {
                $func = clone $func;
            }

            return [Type::T_FUNCTION_REFERENCE, 'scss', $name, $func];
        }

        // native PHP functions

        // try to find a native lib function
        $normalizedName = $this->normalizeName($name);

<         $libName = null;



        if (isset($this->userFunctions[$normalizedName])) {
            // see if we can find a user function
            list($f, $prototype) = $this->userFunctions[$normalizedName];

            return [Type::T_FUNCTION_REFERENCE, 'user', $name, $f, $prototype];
        }


>         $lowercasedName = strtolower($normalizedName);
        if (($f = $this->getBuiltinFunction($normalizedName)) && \is_callable($f)) {
> 
            $libName   = $f[1];
>         // Special functions overriding a CSS function are case-insensitive. We normalize them as lowercase
            $prototype = isset(static::$$libName) ? static::$$libName : null;
>         // to avoid the deprecation warning about the wrong case being used.

>         if ($lowercasedName === 'min' || $lowercasedName === 'max' || $lowercasedName === 'rgb' || $lowercasedName === 'rgba' || $lowercasedName === 'hsl' || $lowercasedName === 'hsla') {
            return [Type::T_FUNCTION_REFERENCE, 'native', $name, $f, $prototype];
>             $normalizedName = $lowercasedName;
        }
>         }

> 


        return static::$null;

>             /** @var string $libName */


    }

>             // All core functions have a prototype defined. Not finding the

>             // prototype can mean 2 things:

>             // - the function comes from a child class (deprecated just after)
    /**
>             // - the function was found with a different case, which relates to calling the
     * Normalize name
>             //   wrong Sass function due to our camelCase usage (`fade-in()` vs `fadein()`),
     *
>             //   because PHP method names are case-insensitive while property names are
     * @param string $name
>             //   case-sensitive.
     *
>             if ($prototype === null || strtolower($normalizedName) !== $normalizedName) {
     * @return string
>                 $r = new \ReflectionMethod($this, $libName);
     */
>                 $actualLibName = $r->name;
    protected function normalizeName($name)
> 
    {
>                 if ($actualLibName !== $libName || strtolower($normalizedName) !== $normalizedName) {
        return str_replace('-', '_', $name);
>                     $kebabCaseName = preg_replace('~(?<=\\w)([A-Z])~', '-$1', substr($actualLibName, 3));
    }
>                     assert($kebabCaseName !== null);

>                     $originalName = strtolower($kebabCaseName);
    /**
>                     $warning = "Calling built-in functions with a non-standard name is deprecated since Scssphp 1.8.0 and will not work anymore in 2.0 (they will be treated as CSS function calls instead).\nUse \"$originalName\" instead of \"$name\".";
     * Normalize value
>                     @trigger_error($warning, E_USER_DEPRECATED);
     *
>                     $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
     * @param array|Number $value
>                     $line  = $this->sourceLine;
     *
>                     Warn::deprecation("$warning\n         on line $line of $fname");
     * @return array|Number
> 
     */
>                     // Use the actual function definition
    public function normalizeValue($value)
>                     $prototype = isset(static::$$actualLibName) ? static::$$actualLibName : null;
    {
>                     $f[1] = $libName = $actualLibName;
        $value = $this->coerceForExpression($this->reduce($value));
>                 }

>             }
        switch ($value[0]) {
> 
            case Type::T_LIST:
>             if (\get_class($this) !== __CLASS__ && !isset($this->warnedChildFunctions[$libName])) {
                $value = $this->extractInterpolation($value);
>                 $r = new \ReflectionMethod($this, $libName);

>                 $declaringClass = $r->getDeclaringClass()->name;
                if ($value[0] !== Type::T_LIST) {
> 
                    return [Type::T_KEYWORD, $this->compileValue($value)];
>                 $needsWarning = $this->warnedChildFunctions[$libName] = $declaringClass !== __CLASS__;
                }
> 

>                 if ($needsWarning) {
                foreach ($value[2] as $key => $item) {
>                     if (method_exists(__CLASS__, $libName)) {
                    $value[2][$key] = $this->normalizeValue($item);
>                         @trigger_error(sprintf('Overriding the "%s" core function by extending the Compiler is deprecated and will be unsupported in 2.0. Remove the "%s::%s" method.', $normalizedName, $declaringClass, $libName), E_USER_DEPRECATED);
                }
>                     } else {

>                         @trigger_error(sprintf('Registering custom functions by extending the Compiler and using the lib* discovery mechanism is deprecated and will be removed in 2.0. Replace the "%s::%s" method with registering the "%s" function through "Compiler::registerFunction".', $declaringClass, $libName, $normalizedName), E_USER_DEPRECATED);
                if (! empty($value['enclosing'])) {
>                     }
                    unset($value['enclosing']);
>                 }
                }
>             }

> 


                return $value;

>      * @internal

>      *


            case Type::T_STRING:

>         if ($value instanceof Number) {
                return [$value[0], '"', [$this->compileStringContent($value)]];
>             return $value;

>         }
            case Type::T_INTERPOLATE:
> 


                return [Type::T_KEYWORD, $this->compileValue($value)];

>                 if ($value[1] === '' && count($value[2]) > 1) {

>                     $value[1] = ' ';
            default:
>                 }
                return $value;
> 


        }
    }

    /**
     * Add numbers
     *
     * @param Number $left
     * @param Number $right
     *
     * @return Number
     */
    protected function opAddNumberNumber(Number $left, Number $right)
    {
        return $left->plus($right);
    }

    /**
     * Multiply numbers
     *
     * @param Number $left
     * @param Number $right
     *
     * @return Number
     */
    protected function opMulNumberNumber(Number $left, Number $right)
    {
        return $left->times($right);
    }

    /**
     * Subtract numbers
     *
     * @param Number $left
     * @param Number $right
     *
     * @return Number
     */
    protected function opSubNumberNumber(Number $left, Number $right)
    {
        return $left->minus($right);
    }

    /**
     * Divide numbers
     *
     * @param Number $left
     * @param Number $right
     *
     * @return Number
     */
    protected function opDivNumberNumber(Number $left, Number $right)
    {
        return $left->dividedBy($right);
    }

    /**
     * Mod numbers
     *
     * @param Number $left
     * @param Number $right
     *
     * @return Number
     */
    protected function opModNumberNumber(Number $left, Number $right)
    {
        return $left->modulo($right);
    }

    /**
     * Add strings
     *
     * @param array $left
     * @param array $right
     *
     * @return array|null
     */
    protected function opAdd($left, $right)
    {
        if ($strLeft = $this->coerceString($left)) {
            if ($right[0] === Type::T_STRING) {
                $right[1] = '';
            }

            $strLeft[2][] = $right;

            return $strLeft;
        }

        if ($strRight = $this->coerceString($right)) {
            if ($left[0] === Type::T_STRING) {
                $left[1] = '';
            }

            array_unshift($strRight[2], $left);

            return $strRight;
        }

        return null;
    }

    /**
     * Boolean and
     *
     * @param array|Number $left
     * @param array|Number  $right

<      * @param boolean $shouldEval



>      * @param bool         $shouldEval


     *
     * @return array|Number|null
     */
    protected function opAnd($left, $right, $shouldEval)
    {
        $truthy = ($left === static::$null || $right === static::$null) ||
                  ($left === static::$false || $left === static::$true) &&
                  ($right === static::$false || $right === static::$true);

        if (! $shouldEval) {
            if (! $truthy) {
                return null;
            }
        }

        if ($left !== static::$false && $left !== static::$null) {
            return $this->reduce($right, true);
        }

        return $left;
    }

    /**
     * Boolean or
     *
     * @param array|Number $left
     * @param array|Number $right

<      * @param boolean $shouldEval



>      * @param bool         $shouldEval


     *
     * @return array|Number|null
     */
    protected function opOr($left, $right, $shouldEval)
    {
        $truthy = ($left === static::$null || $right === static::$null) ||
                  ($left === static::$false || $left === static::$true) &&
                  ($right === static::$false || $right === static::$true);

        if (! $shouldEval) {
            if (! $truthy) {
                return null;
            }
        }

        if ($left !== static::$false && $left !== static::$null) {
            return $left;
        }

        return $this->reduce($right, true);
    }

    /**
     * Compare colors
     *
     * @param string $op
     * @param array  $left
     * @param array  $right
     *
     * @return array
     */
    protected function opColorColor($op, $left, $right)
    {
        if ($op !== '==' && $op !== '!=') {
            $warning = "Color arithmetic is deprecated and will be an error in future versions.\n"
                . "Consider using Sass's color functions instead.";
            $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
            $line  = $this->sourceLine;


<             fwrite($this->stderr, "DEPRECATION WARNING: $warning\n         on line $line of $fname\n\n");



>             Warn::deprecation("$warning\n         on line $line of $fname");


        }

        $out = [Type::T_COLOR];

        foreach ([1, 2, 3] as $i) {
            $lval = isset($left[$i]) ? $left[$i] : 0;
            $rval = isset($right[$i]) ? $right[$i] : 0;

            switch ($op) {
                case '+':
                    $out[] = $lval + $rval;
                    break;

                case '-':
                    $out[] = $lval - $rval;
                    break;

                case '*':
                    $out[] = $lval * $rval;
                    break;

                case '%':
                    if ($rval == 0) {
                        throw $this->error("color: Can't take modulo by zero");
                    }

                    $out[] = $lval % $rval;
                    break;

                case '/':
                    if ($rval == 0) {
                        throw $this->error("color: Can't divide by zero");
                    }

                    $out[] = (int) ($lval / $rval);
                    break;

                case '==':
                    return $this->opEq($left, $right);

                case '!=':
                    return $this->opNeq($left, $right);

                default:
                    throw $this->error("color: unknown op $op");
            }
        }

        if (isset($left[4])) {
            $out[4] = $left[4];
        } elseif (isset($right[4])) {
            $out[4] = $right[4];
        }

        return $this->fixColor($out);
    }

    /**
     * Compare color and number
     *
     * @param string $op
     * @param array  $left
     * @param Number  $right
     *
     * @return array
     */
    protected function opColorNumber($op, $left, Number $right)
    {
        if ($op === '==') {
            return static::$false;
        }

        if ($op === '!=') {
            return static::$true;
        }

        $value = $right->getDimension();

        return $this->opColorColor(
            $op,
            $left,
            [Type::T_COLOR, $value, $value, $value]
        );
    }

    /**
     * Compare number and color
     *
     * @param string $op
     * @param Number  $left
     * @param array  $right
     *
     * @return array
     */
    protected function opNumberColor($op, Number $left, $right)
    {
        if ($op === '==') {
            return static::$false;
        }

        if ($op === '!=') {
            return static::$true;
        }

        $value = $left->getDimension();

        return $this->opColorColor(
            $op,
            [Type::T_COLOR, $value, $value, $value],
            $right
        );
    }

    /**
     * Compare number1 == number2
     *
     * @param array|Number $left
     * @param array|Number $right
     *
     * @return array
     */
    protected function opEq($left, $right)
    {
        if (($lStr = $this->coerceString($left)) && ($rStr = $this->coerceString($right))) {
            $lStr[1] = '';
            $rStr[1] = '';

            $left = $this->compileValue($lStr);
            $right = $this->compileValue($rStr);
        }

        return $this->toBool($left === $right);
    }

    /**
     * Compare number1 != number2
     *
     * @param array|Number $left
     * @param array|Number $right
     *
     * @return array
     */
    protected function opNeq($left, $right)
    {
        if (($lStr = $this->coerceString($left)) && ($rStr = $this->coerceString($right))) {
            $lStr[1] = '';
            $rStr[1] = '';

            $left = $this->compileValue($lStr);
            $right = $this->compileValue($rStr);
        }

        return $this->toBool($left !== $right);
    }

    /**
     * Compare number1 == number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opEqNumberNumber(Number $left, Number $right)
    {
        return $this->toBool($left->equals($right));
    }

    /**
     * Compare number1 != number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opNeqNumberNumber(Number $left, Number $right)
    {
        return $this->toBool(!$left->equals($right));
    }

    /**
     * Compare number1 >= number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opGteNumberNumber(Number $left, Number $right)
    {
        return $this->toBool($left->greaterThanOrEqual($right));
    }

    /**
     * Compare number1 > number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opGtNumberNumber(Number $left, Number $right)
    {
        return $this->toBool($left->greaterThan($right));
    }

    /**
     * Compare number1 <= number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opLteNumberNumber(Number $left, Number $right)
    {
        return $this->toBool($left->lessThanOrEqual($right));
    }

    /**
     * Compare number1 < number2
     *
     * @param Number $left
     * @param Number $right
     *
     * @return array
     */
    protected function opLtNumberNumber(Number $left, Number $right)
    {
        return $this->toBool($left->lessThan($right));
    }

    /**
     * Cast to boolean
     *
     * @api
     *

<      * @param mixed $thing



>      * @param bool $thing


     *
     * @return array
     */
    public function toBool($thing)
    {
        return $thing ? static::$true : static::$false;
    }

    /**
     * Escape non printable chars in strings output as in dart-sass

>      *
     * @param string $string
>      * @internal
     * @return string
>      *


     */

>      * @param bool   $inKeyword
    public function escapeNonPrintableChars($string, $inKeyword = false)
>      *


    {
        static $replacement = [];
        if (empty($replacement[$inKeyword])) {
            for ($i = 0; $i < 32; $i++) {
                if ($i !== 9 || $inKeyword) {
                    $replacement[$inKeyword][chr($i)] = '\\' . dechex($i) . ($inKeyword ? ' ' : chr(0));
                }
            }
        }
        $string = str_replace(array_keys($replacement[$inKeyword]), array_values($replacement[$inKeyword]), $string);
        // chr(0) is not a possible char from the input, so any chr(0) comes from our escaping replacement
        if (strpos($string, chr(0)) !== false) {
            if (substr($string, -1) === chr(0)) {
                $string = substr($string, 0, -1);
            }
            $string = str_replace(
                [chr(0) . '\\',chr(0) . ' '],
                [ '\\', ' '],
                $string
            );
            if (strpos($string, chr(0)) !== false) {
                $parts = explode(chr(0), $string);
                $string = array_shift($parts);
                while (count($parts)) {
                    $next = array_shift($parts);
                    if (strpos("0123456789abcdefABCDEF" . chr(9), $next[0]) !== false) {
                        $string .= " ";
                    }
                    $string .= $next;
                }
            }
        }

        return $string;
    }

    /**
     * Compiles a primitive value into a CSS property value.
     *
     * Values in scssphp are typed by being wrapped in arrays, their format is
     * typically:
     *
     *     array(type, contents [, additional_contents]*)
     *
     * The input is expected to be reduced. This function will not work on
     * things like expressions and variables.
     *
     * @api
     *

<      * @param array|Number|string $value



>      * @param array|Number $value
>      * @param bool         $quote


     *
     * @return string
     */

<     public function compileValue($value)



>     public function compileValue($value, $quote = true)


    {
        $value = $this->reduce($value);


>         if ($value instanceof Number) {
        switch ($value[0]) {
>             return $value->output($this);
            case Type::T_KEYWORD:
>         }
                if (is_string($value[1])) {
> 



<                 if (is_string($value[1])) {
<                     $value[1] = $this->escapeNonPrintableChars($value[1], true);
<                 }
<                 return $value[1];



>                 return $this->escapeNonPrintableChars($value[1], true);


            case Type::T_COLOR:
                // [1] - red component (either number for a %)
                // [2] - green component
                // [3] - blue component
                // [4] - optional alpha component
                list(, $r, $g, $b) = $value;

                $r = $this->compileRGBAValue($r);
                $g = $this->compileRGBAValue($g);
                $b = $this->compileRGBAValue($b);

                if (\count($value) === 5) {
                    $alpha = $this->compileRGBAValue($value[4], true);

                    if (! is_numeric($alpha) || $alpha < 1) {
                        $colorName = Colors::RGBaToColorName($r, $g, $b, $alpha);

                        if (! \is_null($colorName)) {
                            return $colorName;
                        }

                        if (is_numeric($alpha)) {
                            $a = new Number($alpha, '');
                        } else {
                            $a = $alpha;
                        }

                        return 'rgba(' . $r . ', ' . $g . ', ' . $b . ', ' . $a . ')';
                    }
                }

                if (! is_numeric($r) || ! is_numeric($g) || ! is_numeric($b)) {
                    return 'rgb(' . $r . ', ' . $g . ', ' . $b . ')';
                }

                $colorName = Colors::RGBaToColorName($r, $g, $b);

                if (! \is_null($colorName)) {
                    return $colorName;
                }

                $h = sprintf('#%02x%02x%02x', $r, $g, $b);

                // Converting hex color to short notation (e.g. #003399 to #039)
                if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
                    $h = '#' . $h[1] . $h[3] . $h[5];
                }

                return $h;


<             case Type::T_NUMBER:
<                 return $value->output($this);
< 


            case Type::T_STRING:

<                 $content = $this->compileStringContent($value);



>                 $content = $this->compileStringContent($value, $quote);




<                 if ($value[1]) {



>                 if ($value[1] && $quote) {


                    $content = str_replace('\\', '\\\\', $content);

                    $content = $this->escapeNonPrintableChars($content);

                    // force double quote as string quote for the output in certain cases
                    if (
                        $value[1] === "'" &&

<                         (strpos($content, '"') === false or strpos($content, "'") !== false) &&
<                         strpbrk($content, '{}\\\'') !== false



>                         (strpos($content, '"') === false or strpos($content, "'") !== false)


                    ) {
                        $value[1] = '"';
                    } elseif (
                        $value[1] === '"' &&
                        (strpos($content, '"') !== false and strpos($content, "'") === false)
                    ) {
                        $value[1] = "'";
                    }

                    $content = str_replace($value[1], '\\' . $value[1], $content);
                }

                return $value[1] . $content . $value[1];

            case Type::T_FUNCTION:

<                 $args = ! empty($value[2]) ? $this->compileValue($value[2]) : '';



>                 $args = ! empty($value[2]) ? $this->compileValue($value[2], $quote) : '';



                return "$value[1]($args)";

            case Type::T_FUNCTION_REFERENCE:
                $name = ! empty($value[2]) ? $value[2] : '';

                return "get-function(\"$name\")";

            case Type::T_LIST:
                $value = $this->extractInterpolation($value);

                if ($value[0] !== Type::T_LIST) {

<                     return $this->compileValue($value);



>                     return $this->compileValue($value, $quote);


                }

                list(, $delim, $items) = $value;
                $pre = $post = '';

                if (! empty($value['enclosing'])) {
                    switch ($value['enclosing']) {
                        case 'parent':
                            //$pre = '(';
                            //$post = ')';
                            break;
                        case 'forced_parent':
                            $pre = '(';
                            $post = ')';
                            break;
                        case 'bracket':
                        case 'forced_bracket':
                            $pre = '[';
                            $post = ']';
                            break;
                    }
                }


>                 $separator = $delim === '/' ? ' /' : $delim;
                $prefix_value = '';
> 



                if ($delim !== ' ') {
                    $prefix_value = ' ';
                }

                $filtered = [];

                $same_string_quote = null;
                foreach ($items as $item) {
                    if (\is_null($same_string_quote)) {
                        $same_string_quote = false;
                        if ($item[0] === Type::T_STRING) {
                            $same_string_quote = $item[1];
                            foreach ($items as $ii) {
                                if ($ii[0] !== Type::T_STRING) {
                                    $same_string_quote = false;
                                    break;
                                }
                            }
                        }
                    }
                    if ($item[0] === Type::T_NULL) {
                        continue;
                    }
                    if ($same_string_quote === '"' && $item[0] === Type::T_STRING && $item[1]) {
                        $item[1] = $same_string_quote;
                    }


<                     $compiled = $this->compileValue($item);



>                     $compiled = $this->compileValue($item, $quote);



                    if ($prefix_value && \strlen($compiled)) {
                        $compiled = $prefix_value . $compiled;
                    }

                    $filtered[] = $compiled;
                }


<                 return $pre . substr(implode("$delim", $filtered), \strlen($prefix_value)) . $post;



>                 return $pre . substr(implode($separator, $filtered), \strlen($prefix_value)) . $post;



            case Type::T_MAP:
                $keys     = $value[1];
                $values   = $value[2];
                $filtered = [];

                for ($i = 0, $s = \count($keys); $i < $s; $i++) {

<                     $filtered[$this->compileValue($keys[$i])] = $this->compileValue($values[$i]);



>                     $filtered[$this->compileValue($keys[$i], $quote)] = $this->compileValue($values[$i], $quote);


                }

                array_walk($filtered, function (&$value, $key) {
                    $value = $key . ': ' . $value;
                });

                return '(' . implode(', ', $filtered) . ')';

            case Type::T_INTERPOLATED:
                // node created by extractInterpolation
                list(, $interpolate, $left, $right) = $value;
                list(,, $whiteLeft, $whiteRight) = $interpolate;

                $delim = $left[1];

                if ($delim && $delim !== ' ' && ! $whiteLeft) {
                    $delim .= ' ';
                }

                $left = \count($left[2]) > 0

<                     ?  $this->compileValue($left) . $delim . $whiteLeft



>                     ?  $this->compileValue($left, $quote) . $delim . $whiteLeft


                    : '';

                $delim = $right[1];

                if ($delim && $delim !== ' ') {
                    $delim .= ' ';
                }

                $right = \count($right[2]) > 0 ?

<                     $whiteRight . $delim . $this->compileValue($right) : '';



>                     $whiteRight . $delim . $this->compileValue($right, $quote) : '';




<                 return $left . $this->compileValue($interpolate) . $right;



>                 return $left . $this->compileValue($interpolate, $quote) . $right;



            case Type::T_INTERPOLATE:
                // strip quotes if it's a string
                $reduced = $this->reduce($value[1]);


>                 if ($reduced instanceof Number) {
                switch ($reduced[0]) {
>                     return $this->compileValue($reduced, $quote);
                    case Type::T_LIST:
>                 }
                        $reduced = $this->extractInterpolation($reduced);
> 



                        if ($reduced[0] !== Type::T_LIST) {
                            break;
                        }

                        list(, $delim, $items) = $reduced;

                        if ($delim !== ' ') {
                            $delim .= ' ';
                        }

                        $filtered = [];

                        foreach ($items as $item) {
                            if ($item[0] === Type::T_NULL) {
                                continue;
                            }


<                             $temp = $this->compileValue([Type::T_KEYWORD, $item]);
< 
<                             if ($temp[0] === Type::T_STRING) {
<                                 $filtered[] = $this->compileStringContent($temp);
<                             } elseif ($temp[0] === Type::T_KEYWORD) {
<                                 $filtered[] = $temp[1];



>                             if ($item[0] === Type::T_STRING) {
>                                 $filtered[] = $this->compileStringContent($item, $quote);
>                             } elseif ($item[0] === Type::T_KEYWORD) {
>                                 $filtered[] = $item[1];


                            } else {

<                                 $filtered[] = $this->compileValue($temp);



>                                 $filtered[] = $this->compileValue($item, $quote);


                            }
                        }

                        $reduced = [Type::T_KEYWORD, implode("$delim", $filtered)];
                        break;

                    case Type::T_STRING:
                        $reduced = [Type::T_STRING, '', [$this->compileStringContent($reduced)]];
                        break;

                    case Type::T_NULL:
                        $reduced = [Type::T_KEYWORD, ''];
                }


<                 return $this->compileValue($reduced);



>                 return $this->compileValue($reduced, $quote);



            case Type::T_NULL:
                return 'null';

            case Type::T_COMMENT:
                return $this->compileCommentValue($value);

            default:
                throw $this->error('unknown value type: ' . json_encode($value));
        }
    }

    /**

<      * @param array $value



>      * @param array|Number $value


     *

<      * @return array|string



>      * @return string


     */
    protected function compileDebugValue($value)
    {
        $value = $this->reduce($value, true);


>         if ($value instanceof Number) {
        switch ($value[0]) {
>             return $this->compileValue($value);
            case Type::T_STRING:
>         }
                return $this->compileStringContent($value);
> 



            default:
                return $this->compileValue($value);
        }
    }

    /**
     * Flatten list
     *
     * @param array $list
     *
     * @return string

>      *
     */
>      * @deprecated


    protected function flattenList($list)
    {

>         @trigger_error(sprintf('The "%s" method is deprecated.', __METHOD__), E_USER_DEPRECATED);
        return $this->compileValue($list);
> 


    }

    /**

>      * Gets the text of a Sass string
     * Compile string content
>      *
     *
>      * Calling this method on anything else than a SassString is unsupported. Use {@see assertString} first
     * @param array $string
>      * to ensure that the value is indeed a string.
     *
>      *
     * @return string
>      * @param array $value
     */
>      *
    protected function compileStringContent($string)
>      * @return string
    {
>      */
        $parts = [];
>     public function getStringText(array $value)

>     {
        foreach ($string[2] as $part) {
>         if ($value[0] !== Type::T_STRING) {
            if (\is_array($part) || $part instanceof \ArrayAccess) {
>             throw new \InvalidArgumentException('The argument is not a sass string. Did you forgot to use "assertString"?');
                $parts[] = $this->compileValue($part);
>         }
            } else {
> 
                $parts[] = $part;
>         return $this->compileStringContent($value);
            }
>     }
        }
> 

>     /**


        return implode($parts);

>      * @param bool  $quote



<     protected function compileStringContent($string)



>     protected function compileStringContent($string, $quote = true)



<             if (\is_array($part) || $part instanceof \ArrayAccess) {
<                 $parts[] = $this->compileValue($part);



>             if (\is_array($part) || $part instanceof Number) {
>                 $parts[] = $this->compileValue($part, $quote);


     * Extract interpolation; it doesn't need to be recursive, compileValue will handle that
     *
     * @param array $list
     *
     * @return array
     */
    protected function extractInterpolation($list)
    {
        $items = $list[2];

        foreach ($items as $i => $item) {
            if ($item[0] === Type::T_INTERPOLATE) {
                $before = [Type::T_LIST, $list[1], \array_slice($items, 0, $i)];
                $after  = [Type::T_LIST, $list[1], \array_slice($items, $i + 1)];

                return [Type::T_INTERPOLATED, $item, $before, $after];
            }
        }

        return $list;
    }

    /**
     * Find the final set of selectors
     *
     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     * @param \ScssPhp\ScssPhp\Block                $selfParent
     *
     * @return array
     */
    protected function multiplySelectors(Environment $env, $selfParent = null)
    {
        $envs            = $this->compactEnv($env);
        $selectors       = [];
        $parentSelectors = [[]];

        $selfParentSelectors = null;

        if (! \is_null($selfParent) && $selfParent->selectors) {
            $selfParentSelectors = $this->evalSelectors($selfParent->selectors);
        }

        while ($env = array_pop($envs)) {
            if (empty($env->selectors)) {
                continue;
            }

            $selectors = $env->selectors;

            do {
                $stillHasSelf  = false;
                $prevSelectors = $selectors;
                $selectors     = [];

                foreach ($parentSelectors as $parent) {
                    foreach ($prevSelectors as $selector) {
                        if ($selfParentSelectors) {
                            foreach ($selfParentSelectors as $selfParent) {
                                // if no '&' in the selector, each call will give same result, only add once
                                $s = $this->joinSelectors($parent, $selector, $stillHasSelf, $selfParent);
                                $selectors[serialize($s)] = $s;
                            }
                        } else {
                            $s = $this->joinSelectors($parent, $selector, $stillHasSelf);
                            $selectors[serialize($s)] = $s;
                        }
                    }
                }
            } while ($stillHasSelf);

            $parentSelectors = $selectors;
        }

        $selectors = array_values($selectors);

        // case we are just starting a at-root : nothing to multiply but parentSelectors
        if (! $selectors && $selfParentSelectors) {
            $selectors = $selfParentSelectors;
        }

        return $selectors;
    }

    /**
     * Join selectors; looks for & to replace, or append parent before child
     *
     * @param array   $parent
     * @param array   $child

<      * @param boolean $stillHasSelf



>      * @param bool  $stillHasSelf


     * @param array   $selfParentSelectors

     * @return array
     */
    protected function joinSelectors($parent, $child, &$stillHasSelf, $selfParentSelectors = null)
    {
        $setSelf = false;
        $out = [];

        foreach ($child as $part) {
            $newPart = [];

            foreach ($part as $p) {
                // only replace & once and should be recalled to be able to make combinations
                if ($p === static::$selfSelector && $setSelf) {
                    $stillHasSelf = true;
                }

                if ($p === static::$selfSelector && ! $setSelf) {
                    $setSelf = true;

                    if (\is_null($selfParentSelectors)) {
                        $selfParentSelectors = $parent;
                    }

                    foreach ($selfParentSelectors as $i => $parentPart) {
                        if ($i > 0) {
                            $out[] = $newPart;
                            $newPart = [];
                        }

                        foreach ($parentPart as $pp) {
                            if (\is_array($pp)) {
                                $flatten = [];

                                array_walk_recursive($pp, function ($a) use (&$flatten) {
                                    $flatten[] = $a;
                                });

                                $pp = implode($flatten);
                            }

                            $newPart[] = $pp;
                        }
                    }
                } else {
                    $newPart[] = $p;
                }
            }

            $out[] = $newPart;
        }

        return $setSelf ? $out : array_merge($parent, $child);
    }

    /**
     * Multiply media
     *
     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     * @param array                                 $childQueries
     *
     * @return array
     */
    protected function multiplyMedia(Environment $env = null, $childQueries = null)
    {
        if (
            ! isset($env) ||
            ! empty($env->block->type) && $env->block->type !== Type::T_MEDIA
        ) {
            return $childQueries;
        }

        // plain old block, skip
        if (empty($env->block->type)) {
            return $this->multiplyMedia($env->parent, $childQueries);
        }


>         assert($env->block instanceof MediaBlock);
        $parentQueries = isset($env->block->queryList)
> 


            ? $env->block->queryList
            : [[[Type::T_MEDIA_VALUE, $env->block->value]]];

        $store = [$this->env, $this->storeEnv];

        $this->env      = $env;
        $this->storeEnv = null;
        $parentQueries  = $this->evaluateMediaQuery($parentQueries);

        list($this->env, $this->storeEnv) = $store;

        if (\is_null($childQueries)) {
            $childQueries = $parentQueries;
        } else {
            $originalQueries = $childQueries;
            $childQueries = [];

            foreach ($parentQueries as $parentQuery) {
                foreach ($originalQueries as $childQuery) {
                    $childQueries[] = array_merge(
                        $parentQuery,
                        [[Type::T_MEDIA_TYPE, [Type::T_KEYWORD, 'all']]],
                        $childQuery
                    );
                }
            }
        }

        return $this->multiplyMedia($env->parent, $childQueries);
    }

    /**
     * Convert env linked list to stack
     *
     * @param Environment $env
     *
     * @return Environment[]
     *
     * @phpstan-return non-empty-array<Environment>
     */
    protected function compactEnv(Environment $env)
    {
        for ($envs = []; $env; $env = $env->parent) {
            $envs[] = $env;
        }

        return $envs;
    }

    /**
     * Convert env stack to singly linked list
     *
     * @param Environment[] $envs
     *
     * @return Environment
     *
     * @phpstan-param  non-empty-array<Environment> $envs
     */
    protected function extractEnv($envs)
    {
        for ($env = null; $e = array_pop($envs);) {
            $e->parent = $env;
            $env = $e;
        }

        return $env;
    }

    /**
     * Push environment
     *
     * @param \ScssPhp\ScssPhp\Block $block
     *
     * @return \ScssPhp\ScssPhp\Compiler\Environment
     */
    protected function pushEnv(Block $block = null)
    {
        $env = new Environment();
        $env->parent = $this->env;
        $env->parentStore = $this->storeEnv;
        $env->store  = [];
        $env->block  = $block;
        $env->depth  = isset($this->env->depth) ? $this->env->depth + 1 : 0;

        $this->env = $env;
        $this->storeEnv = null;

        return $env;
    }

    /**
     * Pop environment
     *
     * @return void
     */
    protected function popEnv()
    {
        $this->storeEnv = $this->env->parentStore;
        $this->env = $this->env->parent;
    }

    /**
     * Propagate vars from a just poped Env (used in @each and @for)
     *
     * @param array         $store
     * @param null|string[] $excludedVars
     *
     * @return void
     */
    protected function backPropagateEnv($store, $excludedVars = null)
    {
        foreach ($store as $key => $value) {
            if (empty($excludedVars) || ! \in_array($key, $excludedVars)) {
                $this->set($key, $value, true);
            }
        }
    }

    /**
     * Get store environment
     *
     * @return \ScssPhp\ScssPhp\Compiler\Environment
     */
    protected function getStoreEnv()
    {
        return isset($this->storeEnv) ? $this->storeEnv : $this->env;
    }

    /**
     * Set variable
     *
     * @param string                                $name
     * @param mixed                                 $value

<      * @param boolean                               $shadow



>      * @param bool                                  $shadow


     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     * @param mixed                                 $valueUnreduced
     *
     * @return void
     */
    protected function set($name, $value, $shadow = false, Environment $env = null, $valueUnreduced = null)
    {
        $name = $this->normalizeName($name);

        if (! isset($env)) {
            $env = $this->getStoreEnv();
        }

        if ($shadow) {
            $this->setRaw($name, $value, $env, $valueUnreduced);
        } else {
            $this->setExisting($name, $value, $env, $valueUnreduced);
        }
    }

    /**
     * Set existing variable
     *
     * @param string                                $name
     * @param mixed                                 $value
     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     * @param mixed                                 $valueUnreduced
     *
     * @return void
     */
    protected function setExisting($name, $value, Environment $env, $valueUnreduced = null)
    {
        $storeEnv = $env;
        $specialContentKey = static::$namespaces['special'] . 'content';

        $hasNamespace = $name[0] === '^' || $name[0] === '@' || $name[0] === '%';

        $maxDepth = 10000;

        for (;;) {
            if ($maxDepth-- <= 0) {
                break;
            }

            if (\array_key_exists($name, $env->store)) {
                break;
            }

            if (! $hasNamespace && isset($env->marker)) {
                if (! empty($env->store[$specialContentKey])) {
                    $env = $env->store[$specialContentKey]->scope;
                    continue;
                }

                if (! empty($env->declarationScopeParent)) {
                    $env = $env->declarationScopeParent;
                    continue;
                } else {
                    $env = $storeEnv;
                    break;
                }
            }

            if (isset($env->parentStore)) {
                $env = $env->parentStore;
            } elseif (isset($env->parent)) {
                $env = $env->parent;
            } else {
                $env = $storeEnv;
                break;
            }
        }

        $env->store[$name] = $value;

        if ($valueUnreduced) {
            $env->storeUnreduced[$name] = $valueUnreduced;
        }
    }

    /**
     * Set raw variable
     *
     * @param string                                $name
     * @param mixed                                 $value
     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     * @param mixed                                 $valueUnreduced
     *
     * @return void
     */
    protected function setRaw($name, $value, Environment $env, $valueUnreduced = null)
    {
        $env->store[$name] = $value;

        if ($valueUnreduced) {
            $env->storeUnreduced[$name] = $valueUnreduced;
        }
    }

    /**
     * Get variable
     *

<      * @api



>      * @internal


     *
     * @param string                                $name

<      * @param boolean                               $shouldThrow



>      * @param bool                                  $shouldThrow


     * @param \ScssPhp\ScssPhp\Compiler\Environment $env

<      * @param boolean                               $unreduced



>      * @param bool                                  $unreduced


     *
     * @return mixed|null
     */
    public function get($name, $shouldThrow = true, Environment $env = null, $unreduced = false)
    {
        $normalizedName = $this->normalizeName($name);
        $specialContentKey = static::$namespaces['special'] . 'content';

        if (! isset($env)) {
            $env = $this->getStoreEnv();
        }

        $hasNamespace = $normalizedName[0] === '^' || $normalizedName[0] === '@' || $normalizedName[0] === '%';

        $maxDepth = 10000;

        for (;;) {
            if ($maxDepth-- <= 0) {
                break;
            }

            if (\array_key_exists($normalizedName, $env->store)) {
                if ($unreduced && isset($env->storeUnreduced[$normalizedName])) {
                    return $env->storeUnreduced[$normalizedName];
                }

                return $env->store[$normalizedName];
            }

            if (! $hasNamespace && isset($env->marker)) {
                if (! empty($env->store[$specialContentKey])) {
                    $env = $env->store[$specialContentKey]->scope;
                    continue;
                }

                if (! empty($env->declarationScopeParent)) {
                    $env = $env->declarationScopeParent;
                } else {
                    $env = $this->rootEnv;
                }
                continue;
            }

            if (isset($env->parentStore)) {
                $env = $env->parentStore;
            } elseif (isset($env->parent)) {
                $env = $env->parent;
            } else {
                break;
            }
        }

        if ($shouldThrow) {
            throw $this->error("Undefined variable \$$name" . ($maxDepth <= 0 ? ' (infinite recursion)' : ''));
        }

        // found nothing
        return null;
    }

    /**
     * Has variable?
     *
     * @param string                                $name
     * @param \ScssPhp\ScssPhp\Compiler\Environment $env
     *

<      * @return boolean



>      * @return bool


     */
    protected function has($name, Environment $env = null)
    {
        return ! \is_null($this->get($name, false, $env));
    }

    /**
     * Inject variables
     *
     * @param array $args
     *
     * @return void
     */
    protected function injectVariables(array $args)
    {
        if (empty($args)) {
            return;
        }

        $parser = $this->parserFactory(__METHOD__);

        foreach ($args as $name => $strValue) {
            if ($name[0] === '$') {
                $name = substr($name, 1);
            }


<             if (! $parser->parseValue($strValue, $value)) {



>             if (!\is_string($strValue) || ! $parser->parseValue($strValue, $value)) {


                $value = $this->coerceValue($strValue);
            }

            $this->set($name, $value);
        }
    }

    /**

>      * Replaces variables.
     * Set variables
>      *
     *
>      * @param array<string, mixed> $variables
     * @api
>      *
     *
>      * @return void
     * @param array $variables
>      */
     *
>     public function replaceVariables(array $variables)
     * @return void
>     {
     */
>         $this->registeredVars = [];
    public function setVariables(array $variables)
>         $this->addVariables($variables);
    {
>     }
        $this->registeredVars = array_merge($this->registeredVars, $variables);
> 
    }
>     /**

>      * Replaces variables.
    /**
>      *
     * Unset variable
>      * @param array<string, mixed> $variables
     *
>      *
     * @api
>      * @return void
     *
>      */
     * @param string $name
>     public function addVariables(array $variables)
     *
>     {
     * @return void
>         $triggerWarning = false;
     */
> 
    public function unsetVariable($name)
>         foreach ($variables as $name => $value) {
    {
>             if (!$value instanceof Number && !\is_array($value)) {
        unset($this->registeredVars[$name]);
>                 $triggerWarning = true;
    }
>             }

> 
    /**
>             $this->registeredVars[$name] = $value;
     * Returns list of variables
>         }
     *
> 
     * @api
>         if ($triggerWarning) {
     *
>             @trigger_error('Passing raw values to as custom variables to the Compiler is deprecated. Use "\ScssPhp\ScssPhp\ValueConverter::parseValue" or "\ScssPhp\ScssPhp\ValueConverter::fromPhp" to convert them instead.', E_USER_DEPRECATED);
     * @return array
>         }
     */
>     }
    public function getVariables()
> 
    {
>     /**


        return $this->registeredVars;

>      *
    }
>      * @deprecated Use "addVariables" or "replaceVariables" instead.



<         $this->registeredVars = array_merge($this->registeredVars, $variables);



>         @trigger_error('The method "setVariables" of the Compiler is deprecated. Use the "addVariables" method for the equivalent behavior or "replaceVariables" if merging with previous variables was not desired.');
> 
>         $this->addVariables($variables);


    /**
     * Adds to list of parsed files
     *

<      * @api



>      * @internal


     *

<      * @param string $path



>      * @param string|null $path


     *
     * @return void
     */
    public function addParsedFile($path)
    {

<         if (isset($path) && is_file($path)) {



>         if (! \is_null($path) && is_file($path)) {


            $this->parsedFiles[realpath($path)] = filemtime($path);
        }
    }

    /**
     * Returns list of parsed files
     *

<      * @api
<      *
<      * @return array



>      * @deprecated
>      * @return array<string, int>


     */
    public function getParsedFiles()
    {

>         @trigger_error('The method "getParsedFiles" of the Compiler is deprecated. Use the "getIncludedFiles" method on the CompilationResult instance returned by compileString() instead. Be careful that the signature of the method is different.', E_USER_DEPRECATED);


        return $this->parsedFiles;
    }

    /**
     * Add import path
     *
     * @api
     *
     * @param string|callable $path
     *
     * @return void
     */
    public function addImportPath($path)
    {
        if (! \in_array($path, $this->importPaths)) {
            $this->importPaths[] = $path;
        }
    }

    /**
     * Set import paths
     *
     * @api
     *
     * @param string|array<string|callable> $path
     *
     * @return void
     */
    public function setImportPaths($path)
    {
        $paths = (array) $path;
        $actualImportPaths = array_filter($paths, function ($path) {
            return $path !== '';
        });

        $this->legacyCwdImportPath = \count($actualImportPaths) !== \count($paths);

        if ($this->legacyCwdImportPath) {

<             @trigger_error('Passing an empty string in the import paths to refer to the current working directory is deprecated. If that\'s the intended behavior, the value of "getcwd()" should be used directly instead. If this was used for resolving relative imports of the input alongside "chdir" with the source directory, the path of the input file should be passed to "compile()" instead.', E_USER_DEPRECATED);



>             @trigger_error('Passing an empty string in the import paths to refer to the current working directory is deprecated. If that\'s the intended behavior, the value of "getcwd()" should be used directly instead. If this was used for resolving relative imports of the input alongside "chdir" with the source directory, the path of the input file should be passed to "compileString()" instead.', E_USER_DEPRECATED);


        }

        $this->importPaths = $actualImportPaths;
    }

    /**
     * Set number precision
     *
     * @api
     *

<      * @param integer $numberPrecision



>      * @param int $numberPrecision


     *
     * @return void
     *
     * @deprecated The number precision is not configurable anymore. The default is enough for all browsers.
     */
    public function setNumberPrecision($numberPrecision)
    {
        @trigger_error('The number precision is not configurable anymore. '
            . 'The default is enough for all browsers.', E_USER_DEPRECATED);
    }

    /**
     * Sets the output style.
     *
     * @api
     *
     * @param string $style One of the OutputStyle constants
     *
     * @return void
     *
     * @phpstan-param OutputStyle::* $style
     */
    public function setOutputStyle($style)
    {
        switch ($style) {
            case OutputStyle::EXPANDED:

<                 $this->formatter = Expanded::class;



>                 $this->configuredFormatter = Expanded::class;


                break;

            case OutputStyle::COMPRESSED:

<                 $this->formatter = Compressed::class;



>                 $this->configuredFormatter = Compressed::class;


                break;

            default:
                throw new \InvalidArgumentException(sprintf('Invalid output style "%s".', $style));
        }
    }

    /**
     * Set formatter
     *
     * @api
     *
     * @param string $formatterName
     *
     * @return void
     *
     * @deprecated Use {@see setOutputStyle} instead.

>      *
     */
>      * @phpstan-param class-string<Formatter> $formatterName


    public function setFormatter($formatterName)
    {
        if (!\in_array($formatterName, [Expanded::class, Compressed::class], true)) {
            @trigger_error('Formatters other than Expanded and Compressed are deprecated.', E_USER_DEPRECATED);
        }
        @trigger_error('The method "setFormatter" is deprecated. Use "setOutputStyle" instead.', E_USER_DEPRECATED);


<         $this->formatter = $formatterName;



>         $this->configuredFormatter = $formatterName;


    }

    /**
     * Set line number style
     *
     * @api
     *
     * @param string $lineNumberStyle
     *
     * @return void
     *
     * @deprecated The line number output is not supported anymore. Use source maps instead.
     */
    public function setLineNumberStyle($lineNumberStyle)
    {
        @trigger_error('The line number output is not supported anymore. '
                       . 'Use source maps instead.', E_USER_DEPRECATED);
    }

    /**

>      * Configures the handling of non-ASCII outputs.
     * Enable/disable source maps
>      *
     *
>      * If $charset is `true`, this will include a `@charset` declaration or a
     * @api
>      * UTF-8 [byte-order mark][] if the stylesheet contains any non-ASCII
     *
>      * characters. Otherwise, it will never include a `@charset` declaration or a
     * @param integer $sourceMap
>      * byte-order mark.
     *
>      *
     * @return void
>      * [byte-order mark]: https://en.wikipedia.org/wiki/Byte_order_mark#UTF-8
     *
>      *
     * @phpstan-param self::SOURCE_MAP_* $sourceMap
>      * @param bool $charset
     */
>      *
    public function setSourceMap($sourceMap)
>      * @return void
    {
>      */
        $this->sourceMap = $sourceMap;
>     public function setCharset($charset)
    }
>     {

>         $this->charset = $charset;
    /**
>     }
     * Set source map options
> 
     *
>     /**



<      * @param integer $sourceMap



>      * @param int $sourceMap


     *
     * @param array $sourceMapOptions
     *

>      * @phpstan-param  array{sourceRoot?: string, sourceMapFilename?: string|null, sourceMapURL?: string|null, sourceMapWriteTo?: string|null, outputSourceFiles?: bool, sourceMapRootpath?: string, sourceMapBasepath?: string} $sourceMapOptions
     * @return void
>      *


     */
    public function setSourceMapOptions($sourceMapOptions)
    {
        $this->sourceMapOptions = $sourceMapOptions;
    }

    /**
     * Register function
     *
     * @api
     *
     * @param string   $name

<      * @param callable $func
<      * @param array|null $prototype



>      * @param callable      $callback
>      * @param string[]|null $argumentDeclaration


     *
     * @return void
     */

<     public function registerFunction($name, $func, $prototype = null)



>     public function registerFunction($name, $callback, $argumentDeclaration = null)


    {

<         $this->userFunctions[$this->normalizeName($name)] = [$func, $prototype];



>         if (self::isNativeFunction($name)) {
>             @trigger_error(sprintf('The "%s" function is a core sass function. Overriding it with a custom implementation through "%s" is deprecated and won\'t be supported in ScssPhp 2.0 anymore.', $name, __METHOD__), E_USER_DEPRECATED);
>         }
> 
>         if ($argumentDeclaration === null) {
>             @trigger_error('Omitting the argument declaration when registering custom function is deprecated and won\'t be supported in ScssPhp 2.0 anymore.', E_USER_DEPRECATED);
>         }
> 
>         $this->userFunctions[$this->normalizeName($name)] = [$callback, $argumentDeclaration];


    }

    /**
     * Unregister function
     *
     * @api
     *
     * @param string $name
     *
     * @return void
     */
    public function unregisterFunction($name)
    {
        unset($this->userFunctions[$this->normalizeName($name)]);
    }

    /**
     * Add feature
     *
     * @api
     *
     * @param string $name
     *
     * @return void
     *
     * @deprecated Registering additional features is deprecated.
     */
    public function addFeature($name)
    {
        @trigger_error('Registering additional features is deprecated.', E_USER_DEPRECATED);

        $this->registeredFeatures[$name] = true;
    }

    /**
     * Import file
     *
     * @param string                                 $path
     * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
     *
     * @return void
     */
    protected function importFile($path, OutputBlock $out)
    {
        $this->pushCallStack('import ' . $this->getPrettyPath($path));
        // see if tree is cached
        $realPath = realpath($path);


>         if ($realPath === false) {
        if (isset($this->importCache[$realPath])) {
>             $realPath = $path;
            $this->handleImportLoop($realPath);
>         }

> 
            $tree = $this->importCache[$realPath];
>         if (substr($path, -5) === '.sass') {
        } else {
>             $this->sourceIndex = \count($this->sourceNames);
            $code   = file_get_contents($path);
>             $this->sourceNames[] = $path;
            $parser = $this->parserFactory($path);
>             $this->sourceLine = 1;
            $tree   = $parser->parse($code);
>             $this->sourceColumn = 1;

> 
            $this->importCache[$realPath] = $tree;
>             throw $this->error('The Sass indented syntax is not implemented.');
        }
>         }

> 


        $currentDirectory = $this->currentDirectory;
        $this->currentDirectory = dirname($path);

        $this->compileChildrenNoReturn($tree->children, $out);
        $this->currentDirectory = $currentDirectory;
        $this->popCallStack();
    }

    /**

>      * Save the imported files with their resolving path context
     * Return the file path for an import url if it exists
>      *
     *
>      * @param string|null $currentDirectory
     * @api
>      * @param string      $path
     *
>      * @param string      $filePath
     * @param string $url
>      *
     *
>      * @return void
     * @return string|null
>      */
     */
>     private function registerImport($currentDirectory, $path, $filePath)
    public function findImport($url)
>     {
    {
>         $this->resolvedImports[] = ['currentDir' => $currentDirectory, 'path' => $path, 'filePath' => $filePath];
        // for "normal" scss imports (ignore vanilla css and external requests)
>     }
        // Callback importers are still called for BC.
> 
        if (preg_match('~\.css$|^https?://|^//~', $url)) {
>     /**
            foreach ($this->importPaths as $dir) {
>      * Detects whether the import is a CSS import.
                if (\is_string($dir)) {
>      *
                    continue;
>      * For legacy reasons, custom importers are called for those, allowing them
                }
>      * to replace them with an actual Sass import. However this behavior is

>      * deprecated. Custom importers are expected to return null when they receive
                if (\is_callable($dir)) {
>      * a CSS import.
                    // check custom callback for import path
>      *
                    $file = \call_user_func($dir, $url);
>      * @param string $url

>      *
                    if (! \is_null($file)) {
>      * @return bool
                        return $file;
>      */
                    }
>     public static function isCssImport($url)
                }
>     {
            }
>         return 1 === preg_match('~\.css$|^https?://|^//~', $url);
            return null;
>     }
        }
> 

>     /**



<      * @api



>      * @internal


            $relativePath = $this->resolveImportPath($url, $this->currentDirectory);

>      * @param string|null $currentDir



<     public function findImport($url)



>     public function findImport($url, $currentDir = null)



<         // for "normal" scss imports (ignore vanilla css and external requests)



>         // Vanilla css and external requests. These are not meant to be Sass imports.



<         if (preg_match('~\.css$|^https?://|^//~', $url)) {



>         if (self::isCssImport($url)) {


            }

>                         if (\is_array($dir)) {
        }
>                             $callableDescription = (\is_object($dir[0]) ? \get_class($dir[0]) : $dir[0]).'::'.$dir[1];

>                         } elseif ($dir instanceof \Closure) {
        foreach ($this->importPaths as $dir) {
>                             $r = new \ReflectionFunction($dir);
            if (\is_string($dir)) {
>                             if (false !== strpos($r->name, '{closure}')) {
                $path = $this->resolveImportPath($url, $dir);
>                                 $callableDescription = sprintf('closure{%s:%s}', $r->getFileName(), $r->getStartLine());

>                             } elseif ($class = $r->getClosureScopeClass()) {
                if (!\is_null($path)) {
>                                 $callableDescription = $class->name.'::'.$r->name;
                    return $path;
>                             } else {
                }
>                                 $callableDescription = $r->name;
            } elseif (\is_callable($dir)) {
>                             }
                // check custom callback for import path
>                         } elseif (\is_object($dir)) {
                $file = \call_user_func($dir, $url);
>                             $callableDescription = \get_class($dir) . '::__invoke';

>                         } else {
                if (! \is_null($file)) {
>                             $callableDescription = 'callable'; // Fallback if we don't have a dedicated description
                    return $file;
>                         }
                }
>                         @trigger_error(sprintf('Returning a file to import for CSS or external references in custom importer callables is deprecated and will not be supported anymore in ScssPhp 2.0. This behavior is not compliant with the Sass specification. Update your "%s" importer.', $callableDescription), E_USER_DEPRECATED);
            }
> 



<         if (!\is_null($this->currentDirectory)) {
<             $relativePath = $this->resolveImportPath($url, $this->currentDirectory);



>         if (!\is_null($currentDir)) {
>             $relativePath = $this->resolveImportPath($url, $currentDir);


        if ($this->legacyCwdImportPath) {
            $path = $this->resolveImportPath($url, getcwd());

            if (!\is_null($path)) {

<                 @trigger_error('Resolving imports relatively to the current working directory is deprecated. If that\'s the intended behavior, the value of "getcwd()" should be added as an import path explicitly instead. If this was used for resolving relative imports of the input alongside "chdir" with the source directory, the path of the input file should be passed to "compile()" instead.', E_USER_DEPRECATED);



>                 @trigger_error('Resolving imports relatively to the current working directory is deprecated. If that\'s the intended behavior, the value of "getcwd()" should be added as an import path explicitly instead. If this was used for resolving relative imports of the input alongside "chdir" with the source directory, the path of the input file should be passed to "compileString()" instead.', E_USER_DEPRECATED);



                return $path;
            }
        }

        throw $this->error("`$url` file not found for @import");
    }

    /**
     * @param string $url
     * @param string $baseDir
     *
     * @return string|null
     */
    private function resolveImportPath($url, $baseDir)
    {
        $path = Path::join($baseDir, $url);


<         $hasExtension = preg_match('/.scss$/', $url);



>         $hasExtension = preg_match('/.s[ac]ss$/', $url);



        if ($hasExtension) {
            return $this->checkImportPathConflicts($this->tryImportPath($path));
        }

        $result = $this->checkImportPathConflicts($this->tryImportPathWithExtensions($path));

        if (!\is_null($result)) {
            return $result;
        }

        return $this->tryImportPathAsDirectory($path);
    }

    /**
     * @param string[] $paths
     *
     * @return string|null
     */
    private function checkImportPathConflicts(array $paths)
    {
        if (\count($paths) === 0) {
            return null;
        }

        if (\count($paths) === 1) {
            return $paths[0];
        }

        $formattedPrettyPaths = [];

        foreach ($paths as $path) {
            $formattedPrettyPaths[] = '  ' . $this->getPrettyPath($path);
        }

        throw $this->error("It's not clear which file to import. Found:\n" . implode("\n", $formattedPrettyPaths));
    }

    /**
     * @param string $path
     *
     * @return string[]
     */
    private function tryImportPathWithExtensions($path)
    {

<         $result = $this->tryImportPath($path.'.scss');



>         $result = array_merge(
>             $this->tryImportPath($path.'.sass'),
>             $this->tryImportPath($path.'.scss')
>         );



        if ($result) {
            return $result;
        }

        return $this->tryImportPath($path.'.css');
    }

    /**
     * @param string $path
     *
     * @return string[]
     */
    private function tryImportPath($path)
    {
        $partial = dirname($path).'/_'.basename($path);

        $candidates = [];

        if (is_file($partial)) {
            $candidates[] = $partial;
        }

        if (is_file($path)) {
            $candidates[] = $path;
        }

        return $candidates;
    }

    /**
     * @param string $path
     *
     * @return string|null
     */
    private function tryImportPathAsDirectory($path)
    {
        if (!is_dir($path)) {
            return null;
        }

        return $this->checkImportPathConflicts($this->tryImportPathWithExtensions($path.'/index'));
    }

    /**

<      * @param string $path



>      * @param string|null $path


     *
     * @return string
     */
    private function getPrettyPath($path)
    {

>         if ($path === null) {
        $normalizedPath = $path;
>             return '(unknown file)';
        $normalizedRootDirectory = $this->rootDirectory.'/';
>         }

> 


        if (\DIRECTORY_SEPARATOR === '\\') {
            $normalizedRootDirectory = str_replace('\\', '/', $normalizedRootDirectory);
            $normalizedPath = str_replace('\\', '/', $path);
        }

        if (0 === strpos($normalizedPath, $normalizedRootDirectory)) {

<             return substr($normalizedPath, \strlen($normalizedRootDirectory));



>             return substr($path, \strlen($normalizedRootDirectory));


        }

        return $path;
    }

    /**
     * Set encoding
     *
     * @api
     *

<      * @param string $encoding



>      * @param string|null $encoding


     *
     * @return void

>      *
     */
>      * @deprecated Non-compliant support for other encodings than UTF-8 is deprecated.


    public function setEncoding($encoding)
    {

>         if (!$encoding || strtolower($encoding) === 'utf-8') {
        $this->encoding = $encoding;
>             @trigger_error(sprintf('The "%s" method is deprecated.', __METHOD__), E_USER_DEPRECATED);
    }
>         } else {

>             @trigger_error(sprintf('The "%s" method is deprecated. Parsing will only support UTF-8 in ScssPhp 2.0. The non-UTF-8 parsing of ScssPhp 1.x is not spec compliant.', __METHOD__), E_USER_DEPRECATED);
    /**
>         }
     * Ignore errors?
> 


     *
     * @api
     *

<      * @param boolean $ignoreErrors



>      * @param bool $ignoreErrors


     *
     * @return \ScssPhp\ScssPhp\Compiler
     *
     * @deprecated Ignoring Sass errors is not longer supported.
     */
    public function setIgnoreErrors($ignoreErrors)
    {
        @trigger_error('Ignoring Sass errors is not longer supported.', E_USER_DEPRECATED);

        return $this;
    }

    /**
     * Get source position
     *
     * @api
     *
     * @return array

>      *
     */
>      * @deprecated


    public function getSourcePosition()
    {

>         @trigger_error(sprintf('The "%s" method is deprecated.', __METHOD__), E_USER_DEPRECATED);
        $sourceFile = isset($this->sourceNames[$this->sourceIndex]) ? $this->sourceNames[$this->sourceIndex] : '';
> 



        return [$sourceFile, $this->sourceLine, $this->sourceColumn];
    }

    /**
     * Throw error (exception)
     *
     * @api
     *
     * @param string $msg Message with optional sprintf()-style vararg parameters
     *

>      * @return never
     * @throws \ScssPhp\ScssPhp\Exception\CompilerException
>      *


     *
     * @deprecated use "error" and throw the exception in the caller instead.
     */
    public function throwError($msg)
    {
        @trigger_error(
            'The method "throwError" is deprecated. Use "error" and throw the exception in the caller instead',
            E_USER_DEPRECATED
        );

        throw $this->error(...func_get_args());
    }

    /**
     * Build an error (exception)
     *

<      * @api



>      * @internal


     *
     * @param string $msg Message with optional sprintf()-style vararg parameters

>      * @param bool|float|int|string|null ...$args


     *
     * @return CompilerException
     */
    public function error($msg, ...$args)
    {
        if ($args) {
            $msg = sprintf($msg, ...$args);
        }

        if (! $this->ignoreCallStackMessage) {

>             $msg = $this->addLocationToMessage($msg);
            $line   = $this->sourceLine;
>         }
            $column = $this->sourceColumn;
> 

>         return new CompilerException($msg);
            $loc = isset($this->sourceNames[$this->sourceIndex])
>     }
                ? $this->getPrettyPath($this->sourceNames[$this->sourceIndex]) . " on line $line, at column $column"
> 
                : "line: $line, column: $column";
>     /**

>      * @param string $msg
            $msg = "$msg: $loc";
>      *

>      * @return string
            $callStackMsg = $this->callStackMessage();
>      */

>     private function addLocationToMessage($msg)
            if ($callStackMsg) {
>     {


                $msg .= "\nCall Stack:\n" . $callStackMsg;
            }

<         }




<         return new CompilerException($msg);



>         return $msg;


    }

    /**
     * @param string $functionName
     * @param array $ExpectedArgs
     * @param int $nbActual
     * @return CompilerException

>      *
     */
>      * @deprecated


    public function errorArgsNumber($functionName, $ExpectedArgs, $nbActual)
    {

>         @trigger_error(sprintf('The "%s" method is deprecated.', __METHOD__), E_USER_DEPRECATED);
        $nbExpected = \count($ExpectedArgs);
> 



        if ($nbActual > $nbExpected) {
            return $this->error(
                'Error: Only %d arguments allowed in %s(), but %d were passed.',
                $nbExpected,
                $functionName,
                $nbActual
            );
        } else {
            $missing = [];

            while (count($ExpectedArgs) && count($ExpectedArgs) > $nbActual) {
                array_unshift($missing, array_pop($ExpectedArgs));
            }

            return $this->error(
                'Error: %s() argument%s %s missing.',
                $functionName,
                count($missing) > 1 ? 's' : '',
                implode(', ', $missing)
            );
        }
    }

    /**
     * Beautify call stack for output
     *

<      * @param boolean $all
<      * @param null    $limit



>      * @param bool     $all
>      * @param int|null $limit


     *
     * @return string
     */
    protected function callStackMessage($all = false, $limit = null)
    {
        $callStackMsg = [];
        $ncall = 0;

        if ($this->callStack) {
            foreach (array_reverse($this->callStack) as $call) {
                if ($all || (isset($call['n']) && $call['n'])) {
                    $msg = '#' . $ncall++ . ' ' . $call['n'] . ' ';
                    $msg .= (isset($this->sourceNames[$call[Parser::SOURCE_INDEX]])
                          ? $this->getPrettyPath($this->sourceNames[$call[Parser::SOURCE_INDEX]])
                          : '(unknown file)');
                    $msg .= ' on line ' . $call[Parser::SOURCE_LINE];

                    $callStackMsg[] = $msg;

                    if (! \is_null($limit) && $ncall > $limit) {
                        break;
                    }
                }
            }
        }

        return implode("\n", $callStackMsg);
    }

    /**
     * Handle import loop
     *
     * @param string $name
     *

>      * @return void
     * @throws \Exception
>      *


     */
    protected function handleImportLoop($name)
    {
        for ($env = $this->env; $env; $env = $env->parent) {
            if (! $env->block) {
                continue;
            }

            $file = $this->sourceNames[$env->block->sourceIndex];


>             if ($file === null) {
            if (realpath($file) === $name) {
>                 continue;
                throw $this->error('An @import loop has been found: %s imports %s', $file, basename($file));
>             }
            }
> 


        }
    }

    /**
     * Call SCSS @function
     *

<      * @param Object $func



>      * @param CallableBlock|null $func


     * @param array  $argValues
     *

<      * @return array



>      * @return array|Number


     */
    protected function callScssFunction($func, $argValues)
    {
        if (! $func) {
            return static::$defaultValue;
        }
        $name = $func->name;

        $this->pushEnv();

        // set the args
        if (isset($func->args)) {
            $this->applyArguments($func->args, $argValues);
        }

        // throw away lines and children
        $tmp = new OutputBlock();
        $tmp->lines    = [];
        $tmp->children = [];

        $this->env->marker = 'function';

        if (! empty($func->parentEnv)) {
            $this->env->declarationScopeParent = $func->parentEnv;
        } else {
            throw $this->error("@function $name() without parentEnv");
        }

        $ret = $this->compileChildren($func->children, $tmp, $this->env->marker . ' ' . $name);

        $this->popEnv();

        return ! isset($ret) ? static::$defaultValue : $ret;
    }

    /**
     * Call built-in and registered (PHP) functions
     *
     * @param string $name

<      * @param string|array $function



>      * @param callable $function


     * @param array  $prototype
     * @param array  $args
     *
     * @return array|Number|null
     */
    protected function callNativeFunction($name, $function, $prototype, $args)
    {
        $libName = (is_array($function) ? end($function) : null);
        $sorted_kwargs = $this->sortNativeFunctionArgs($libName, $prototype, $args);

        if (\is_null($sorted_kwargs)) {
            return null;
        }
        @list($sorted, $kwargs) = $sorted_kwargs;

        if ($name !== 'if') {

<             $inExp = true;
< 
<             if ($name === 'join') {
<                 $inExp = false;
<             }
< 


            foreach ($sorted as &$val) {

<                 $val = $this->reduce($val, $inExp);



>                 if ($val !== null) {
>                     $val = $this->reduce($val, true);
>                 }


            }
        }

        $returnValue = \call_user_func($function, $sorted, $kwargs);

        if (! isset($returnValue)) {
            return null;
        }


>         if (\is_array($returnValue) || $returnValue instanceof Number) {
        return $this->coerceValue($returnValue);
>             return $returnValue;
    }
>         }

> 
    /**
>         @trigger_error(sprintf('Returning a PHP value from the "%s" custom function is deprecated. A sass value must be returned instead.', $name), E_USER_DEPRECATED);
     * Get built-in function
> 


     *
     * @param string $name Normalized name
     *
     * @return array
     */
    protected function getBuiltinFunction($name)
    {
        $libName = self::normalizeNativeFunctionName($name);
        return [$this, $libName];
    }

    /**
     * Normalize native function name

>      *
     * @param string $name
>      * @internal
     * @return string
>      *


     */

>      *


    public static function normalizeNativeFunctionName($name)
    {
        $name = str_replace("-", "_", $name);
        $libName = 'lib' . preg_replace_callback(
            '/_(.)/',
            function ($m) {
                return ucfirst($m[1]);
            },
            ucfirst($name)
        );
        return $libName;
    }

    /**
     * Check if a function is a native built-in scss function, for css parsing

>      *
     * @param string $name
>      * @internal
     * @return bool
>      *


     */

>      *


    public static function isNativeFunction($name)
    {
        return method_exists(Compiler::class, self::normalizeNativeFunctionName($name));
    }

    /**
     * Sorts keyword arguments
     *
     * @param string $functionName

<      * @param array  $prototypes



>      * @param array|null  $prototypes


     * @param array  $args
     *
     * @return array|null
     */
    protected function sortNativeFunctionArgs($functionName, $prototypes, $args)
    {
        static $parser = null;

        if (! isset($prototypes)) {
            $keyArgs = [];
            $posArgs = [];

            if (\is_array($args) && \count($args) && \end($args) === static::$null) {
                array_pop($args);
            }

            // separate positional and keyword arguments
            foreach ($args as $arg) {
                list($key, $value) = $arg;

                if (empty($key) or empty($key[1])) {
                    $posArgs[] = empty($arg[2]) ? $value : $arg;
                } else {
                    $keyArgs[$key[1]] = $value;
                }
            }

            return [$posArgs, $keyArgs];
        }

        // specific cases ?
        if (\in_array($functionName, ['libRgb', 'libRgba', 'libHsl', 'libHsla'])) {
            // notation 100 127 255 / 0 is in fact a simple list of 4 values
            foreach ($args as $k => $arg) {

<                 if ($arg[1][0] === Type::T_LIST && \count($arg[1][2]) === 3) {
<                     $last = end($arg[1][2]);
< 
<                     if ($last[0] === Type::T_EXPRESSION && $last[1] === '/') {
<                         array_pop($arg[1][2]);
<                         $arg[1][2][] = $last[2];
<                         $arg[1][2][] = $last[3];
<                         $args[$k] = $arg;



>                 if (!isset($arg[1])) {
>                     continue; // This happens when using a trailing comma


                    }

>                 if ($arg[1][0] === Type::T_LIST && \count($arg[1][2]) === 3) {
                }
>                     $args[$k][1][2] = $this->extractSlashAlphaInColorFunction($arg[1][2]);


            }
        }


<         $finalArgs = [];



>         list($positionalArgs, $namedArgs, $names, $separator, $hasSplat) = $this->evaluateArguments($args, false);



        if (! \is_array(reset($prototypes))) {
            $prototypes = [$prototypes];
        }


>         $parsedPrototypes = array_map([$this, 'parseFunctionPrototype'], $prototypes);
        $keyArgs = [];
>         assert(!empty($parsedPrototypes));

>         $matchedPrototype = $this->selectFunctionPrototype($parsedPrototypes, \count($positionalArgs), $names);
        // trying each prototypes
> 
        $prototypeHasMatch = false;
>         $this->verifyPrototype($matchedPrototype, \count($positionalArgs), $names, $hasSplat);
        $exceptionMessage = '';
> 

>         $vars = $this->applyArgumentsToDeclaration($matchedPrototype, $positionalArgs, $namedArgs, $separator);
        foreach ($prototypes as $prototype) {
> 
            $argDef = [];
>         $finalArgs = [];



<         // trying each prototypes
<         $prototypeHasMatch = false;
<         $exceptionMessage = '';



>         foreach ($matchedPrototype['arguments'] as $argument) {
>             list($normalizedName, $originalName, $default) = $argument;



<         foreach ($prototypes as $prototype) {
<             $argDef = [];



>             if (isset($vars[$normalizedName])) {
>                 $value = $vars[$normalizedName];
>             } else {
>                 $value = $default;
>             }
> 
>             // special null value as default: translate to real null here
>             if ($value === [Type::T_KEYWORD, 'null']) {
>                 $value = null;
>             }
> 
>             $finalArgs[] = $value;
>             $keyArgs[$originalName] = $value;
>         }
> 
>         if ($matchedPrototype['rest_argument'] !== null) {
>             $value = $vars[$matchedPrototype['rest_argument']];
> 
>             $finalArgs[] = $value;
>             $keyArgs[$matchedPrototype['rest_argument']] = $value;
>         }
> 
>         return [$finalArgs, $keyArgs];
>     }
> 
>     /**
>      * Parses a function prototype to the internal representation of arguments.
>      *
>      * The input is an array of strings describing each argument, as supported
>      * in {@see registerFunction}. Argument names don't include the `$`.
>      * The output contains the list of positional argument, with their normalized
>      * name (underscores are replaced by dashes), their original name (to be used
>      * in case of error reporting) and their default value. The output also contains
>      * the normalized name of the rest argument, or null if the function prototype
>      * is not variadic.
>      *
>      * @param string[] $prototype
>      *
>      * @return array
>      * @phpstan-return array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}
>      */
>     private function parseFunctionPrototype(array $prototype)
>     {
>         static $parser = null;
> 
>         $arguments = [];
>         $restArgument = null;
> 
>         foreach ($prototype as $p) {
>             if (null !== $restArgument) {
>                 throw new \InvalidArgumentException('The argument declaration is invalid. The rest argument must be the last one.');
>             }



<             foreach ($prototype as $i => $p) {



<                 $name    = array_shift($p);



>             $name = str_replace('_', '-', $p[0]);



<                 if (\count($p)) {
<                     $p = trim(reset($p));



>             if (isset($p[1])) {
>                 $defaultSource = trim($p[1]);



<                     if ($p === 'null') {



>                 if ($defaultSource === 'null') {


                        // differentiate this null from the static::$null
                        $default = [Type::T_KEYWORD, 'null'];
                    } else {
                        if (\is_null($parser)) {
                            $parser = $this->parserFactory(__METHOD__);
                        }


<                         $parser->parseValue($p, $default);



>                     $parser->parseValue($defaultSource, $default);


                    }
                }


<                 $isVariable = false;
< 


                if (substr($name, -3) === '...') {

<                     $isVariable = true;
<                     $name = substr($name, 0, -3);



>                 $restArgument = substr($name, 0, -3);
>             } else {
>                 $arguments[] = [$name, $p[0], $default];


                }

< 
<                 $argDef[] = [$name, $default, $isVariable];


            }


<             $ignoreCallStackMessage = $this->ignoreCallStackMessage;
<             $this->ignoreCallStackMessage = true;



>         return [
>             'arguments' => $arguments,
>             'rest_argument' => $restArgument,
>         ];
>     }




<             try {
<                 if (\count($args) > \count($argDef)) {
<                     $lastDef = end($argDef);



>     /**
>      * Returns the function prototype for the given positional and named arguments.
>      *
>      * If no exact match is found, finds the closest approximation. Note that this
>      * doesn't guarantee that $positional and $names are valid for the returned
>      * prototype.
>      *
>      * @param array[]               $prototypes
>      * @param int                   $positional
>      * @param array<string, string> $names A set of names, as both keys and values
>      *
>      * @return array
>      *
>      * @phpstan-param non-empty-list<array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}> $prototypes
>      * @phpstan-return array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}
>      */
>     private function selectFunctionPrototype(array $prototypes, $positional, array $names)
>     {
>         $fuzzyMatch = null;
>         $minMismatchDistance = null;




<                     // check that last arg is not a ...
<                     if (empty($lastDef[2])) {
<                         throw $this->errorArgsNumber($functionName, $argDef, \count($args));
<                     }



>         foreach ($prototypes as $prototype) {
>             // Ideally, find an exact match.
>             if ($this->checkPrototypeMatches($prototype, $positional, $names)) {
>                 return $prototype;


                }

<                 $vars = $this->applyArguments($argDef, $args, false, false);




<                 // ensure all args are populated
<                 foreach ($prototype as $i => $p) {
<                     $name = explode(':', $p)[0];



>             $mismatchDistance = \count($prototype['arguments']) - $positional;




<                     if (! isset($finalArgs[$i])) {
<                         $finalArgs[$i] = null;



>             if ($minMismatchDistance !== null) {
>                 if (abs($mismatchDistance) > abs($minMismatchDistance)) {
>                     continue;
>                 }
> 
>                 // If two overloads have the same mismatch distance, favor the overload
>                 // that has more arguments.
>                 if (abs($mismatchDistance) === abs($minMismatchDistance) && $mismatchDistance < 0) {
>                     continue;


                    }
                }


<                 // apply positional args
<                 foreach (array_values($vars) as $i => $val) {
<                     $finalArgs[$i] = $val;



>             $minMismatchDistance = $mismatchDistance;
>             $fuzzyMatch = $prototype;


                }


<                 $keyArgs = array_merge($keyArgs, $vars);
<                 $prototypeHasMatch = true;



>         return $fuzzyMatch;
>     }




<                 // overwrite positional args with keyword args
<                 foreach ($prototype as $i => $p) {
<                     $name = explode(':', $p)[0];



>     /**
>      * Checks whether the argument invocation matches the callable prototype.
>      *
>      * The rules are similar to {@see verifyPrototype}. The boolean return value
>      * avoids the overhead of building and catching exceptions when the reason of
>      * not matching the prototype does not need to be known.
>      *
>      * @param array                 $prototype
>      * @param int                   $positional
>      * @param array<string, string> $names
>      *
>      * @return bool
>      *
>      * @phpstan-param array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null} $prototype
>      */
>     private function checkPrototypeMatches(array $prototype, $positional, array $names)
>     {
>         $nameUsed = 0;




<                     if (isset($keyArgs[$name])) {
<                         $finalArgs[$i] = $keyArgs[$name];
<                     }



>         foreach ($prototype['arguments'] as $i => $argument) {
>             list ($name, $originalName, $default) = $argument;




<                     // special null value as default: translate to real null here
<                     if ($finalArgs[$i] === [Type::T_KEYWORD, 'null']) {
<                         $finalArgs[$i] = null;
<                     }



>             if ($i < $positional) {
>                 if (isset($names[$name])) {
>                     return false;


                }

<                 // should we break if this prototype seems fulfilled?
<             } catch (CompilerException $e) {
<                 $exceptionMessage = $e->getMessage();



>             } elseif (isset($names[$name])) {
>                 $nameUsed++;
>             } elseif ($default === null) {
>                 return false;


            }

<             $this->ignoreCallStackMessage = $ignoreCallStackMessage;


        }


<         if ($exceptionMessage && ! $prototypeHasMatch) {
<             if (\in_array($functionName, ['libRgb', 'libRgba', 'libHsl', 'libHsla'])) {
<                 // if var() or calc() is used as an argument, return as a css function
<                 foreach ($args as $arg) {
<                     if ($arg[1][0] === Type::T_FUNCTION_CALL && in_array($arg[1][1], ['var'])) {
<                         return null;
<                     }



>         if ($prototype['rest_argument'] !== null) {
>             return true;


                }

> 
            }
>         if ($positional > \count($prototype['arguments'])) {

>             return false;



<             throw $this->error($exceptionMessage);



>         if ($nameUsed < \count($names)) {
>             return false;


        }


<         return [$finalArgs, $keyArgs];



>         return true;


    }

    /**

<      * Apply argument values per definition



>      * Verifies that the argument invocation is valid for the callable prototype.


     *

<      * @param array   $argDef
<      * @param array   $argValues
<      * @param boolean $storeInEnv
<      * @param boolean $reduce
<      *   only used if $storeInEnv = false



>      * @param array                 $prototype
>      * @param int                   $positional
>      * @param array<string, string> $names
>      * @param bool                  $hasSplat


     *

<      * @return array



>      * @return void


     *

<      * @throws \Exception



>      * @throws SassScriptException
>      *
>      * @phpstan-param array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null} $prototype


     */

<     protected function applyArguments($argDef, $argValues, $storeInEnv = true, $reduce = true)



>     private function verifyPrototype(array $prototype, $positional, array $names, $hasSplat)


    {

<         $output = [];



>         $nameUsed = 0;




<         if (\is_array($argValues) && \count($argValues) && end($argValues) === static::$null) {
<             array_pop($argValues);
<         }



>         foreach ($prototype['arguments'] as $i => $argument) {
>             list ($name, $originalName, $default) = $argument;




<         if ($storeInEnv) {
<             $storeEnv = $this->getStoreEnv();



>             if ($i < $positional) {
>                 if (isset($names[$name])) {
>                     throw new SassScriptException(sprintf('Argument $%s was passed both by position and by name.', $originalName));
>                 }
>             } elseif (isset($names[$name])) {
>                 $nameUsed++;
>             } elseif ($default === null) {
>                 throw new SassScriptException(sprintf('Missing argument $%s', $originalName));
>             }
>         }




<             $env = new Environment();
<             $env->store = $storeEnv->store;



>         if ($prototype['rest_argument'] !== null) {
>             return;


        }


<         $hasVariable = false;
<         $args = [];



>         if ($positional > \count($prototype['arguments'])) {
>             $message = sprintf(
>                 'Only %d %sargument%s allowed, but %d %s passed.',
>                 \count($prototype['arguments']),
>                 empty($names) ? '' : 'positional ',
>                 \count($prototype['arguments']) === 1 ? '' : 's',
>                 $positional,
>                 $positional === 1 ? 'was' : 'were'
>             );
>             if (!$hasSplat) {
>                 throw new SassScriptException($message);
>             }




<         foreach ($argDef as $i => $arg) {
<             list($name, $default, $isVariable) = $argDef[$i];



>             $message = $this->addLocationToMessage($message);
>             $message .= "\nThis will be an error in future versions of Sass.";
>             $this->logger->warn($message, true);
>         }
> 
>         if ($nameUsed < \count($names)) {
>             $unknownNames = array_values(array_diff($names, array_column($prototype['arguments'], 0)));
>             $lastName = array_pop($unknownNames);
>             $message = sprintf(
>                 'No argument%s named $%s%s.',
>                 $unknownNames ? 's' : '',
>                 $unknownNames ? implode(', $', $unknownNames) . ' or $' : '',
>                 $lastName
>             );
>             throw new SassScriptException($message);
>         }
>     }




<             $args[$name] = [$i, $name, $default, $isVariable];
<             $hasVariable |= $isVariable;



>     /**
>      * Evaluates the argument from the invocation.
>      *
>      * This returns several things about this invocation:
>      * - the list of positional arguments
>      * - the map of named arguments, indexed by normalized names
>      * - the set of names used in the arguments (that's an array using the normalized names as keys for O(1) access)
>      * - the separator used by the list using the splat operator, if any
>      * - a boolean indicator whether any splat argument (list or map) was used, to support the incomplete error reporting.
>      *
>      * @param array[] $args
>      * @param bool    $reduce Whether arguments should be reduced to their value
>      *
>      * @return array
>      *
>      * @throws SassScriptException
>      *
>      * @phpstan-return array{0: list<array|Number>, 1: array<string, array|Number>, 2: array<string, string>, 3: string|null, 4: bool}
>      */
>     private function evaluateArguments(array $args, $reduce = true)
>     {
>         // this represents trailing commas
>         if (\count($args) && end($args) === static::$null) {
>             array_pop($args);


        }

        $splatSeparator      = null;
        $keywordArgs         = [];

<         $deferredKeywordArgs = [];
<         $deferredNamedKeywordArgs = [];
<         $remaining           = [];



>         $names = [];
>         $positionalArgs = [];


        $hasKeywordArgument  = false;

>         $hasSplat = false;




<         // assign the keyword args
<         foreach ((array) $argValues as $arg) {



>         foreach ($args as $arg) {


            if (! empty($arg[0])) {
                $hasKeywordArgument = true;


<                 $name = $arg[0][1];



>                 assert(\is_string($arg[0][1]));
>                 $name = str_replace('_', '-', $arg[0][1]);




<                 if (! isset($args[$name])) {
<                     foreach (array_keys($args) as $an) {
<                         if (str_replace('_', '-', $an) === str_replace('_', '-', $name)) {
<                             $name = $an;
<                             break;
<                         }
<                     }



>                 if (isset($keywordArgs[$name])) {
>                     throw new SassScriptException(sprintf('Duplicate named argument $%s.', $arg[0][1]));


                }


<                 if (! isset($args[$name]) || $args[$name][3]) {
<                     if ($hasVariable) {
<                         $deferredNamedKeywordArgs[$name] = $arg[1];
<                     } else {
<                         throw $this->error("Mixin or function doesn't have an argument named $%s.", $arg[0][1]);
<                     }
<                 } elseif ($args[$name][0] < \count($remaining)) {
<                     throw $this->error("The argument $%s was passed both by position and by name.", $arg[0][1]);
<                 } else {
<                     $keywordArgs[$name] = $arg[1];
<                 }



>                 $keywordArgs[$name] = $this->maybeReduce($reduce, $arg[1]);
>                 $names[$name] = $name;


            } elseif (! empty($arg[2])) {
                // $arg[2] means a var followed by ... in the arg ($list... )
                $val = $this->reduce($arg[1], true);

>                 $hasSplat = true;



                if ($val[0] === Type::T_LIST) {

<                     foreach ($val[2] as $name => $item) {
<                         if (! is_numeric($name)) {
<                             if (! isset($args[$name])) {
<                                 foreach (array_keys($args) as $an) {
<                                     if (str_replace('_', '-', $an) === str_replace('_', '-', $name)) {
<                                         $name = $an;
<                                         break;
<                                     }
<                                 }



>                     foreach ($val[2] as $item) {
>                         if (\is_null($splatSeparator)) {
>                             $splatSeparator = $val[1];


                            }


<                             if ($hasVariable) {
<                                 $deferredKeywordArgs[$name] = $item;
<                             } else {
<                                 $keywordArgs[$name] = $item;



>                         $positionalArgs[] = $this->maybeReduce($reduce, $item);


                            }

<                         } else {
<                             if (\is_null($splatSeparator)) {
<                                 $splatSeparator = $val[1];



> 
>                     if (isset($val[3]) && \is_array($val[3])) {
>                         foreach ($val[3] as $name => $item) {
>                             assert(\is_string($name));
> 
>                             $normalizedName = str_replace('_', '-', $name);
> 
>                             if (isset($keywordArgs[$normalizedName])) {
>                                 throw new SassScriptException(sprintf('Duplicate named argument $%s.', $name));


                            }


<                             $remaining[] = $item;



>                             $keywordArgs[$normalizedName] = $this->maybeReduce($reduce, $item);
>                             $names[$normalizedName] = $normalizedName;
>                             $hasKeywordArgument = true;


                        }
                    }
                } elseif ($val[0] === Type::T_MAP) {
                    foreach ($val[1] as $i => $name) {
                        $name = $this->compileStringContent($this->coerceString($name));
                        $item = $val[2][$i];

                        if (! is_numeric($name)) {

<                             if (! isset($args[$name])) {
<                                 foreach (array_keys($args) as $an) {
<                                     if (str_replace('_', '-', $an) === str_replace('_', '-', $name)) {
<                                         $name = $an;
<                                         break;
<                                     }
<                                 }
<                             }



>                             $normalizedName = str_replace('_', '-', $name);




<                             if ($hasVariable) {
<                                 $deferredKeywordArgs[$name] = $item;
<                             } else {
<                                 $keywordArgs[$name] = $item;



>                             if (isset($keywordArgs[$normalizedName])) {
>                                 throw new SassScriptException(sprintf('Duplicate named argument $%s.', $name));


                            }

> 
                        } else {
>                             $keywordArgs[$normalizedName] = $this->maybeReduce($reduce, $item);
                            if (\is_null($splatSeparator)) {
>                             $names[$normalizedName] = $normalizedName;
                                $splatSeparator = $val[1];
>                             $hasKeywordArgument = true;


                            }


<                             $remaining[] = $item;



>                             $positionalArgs[] = $this->maybeReduce($reduce, $item);


                        }
                    }

<                 } else {
<                     $remaining[] = $val;



>                 } elseif ($val[0] !== Type::T_NULL) { // values other than null are treated a single-element lists, while null is the empty list
>                     $positionalArgs[] = $this->maybeReduce($reduce, $val);


                }
            } elseif ($hasKeywordArgument) {

<                 throw $this->error('Positional arguments must come before keyword arguments.');



>                 throw new SassScriptException('Positional arguments must come before keyword arguments.');


            } else {

<                 $remaining[] = $arg[1];



>                 $positionalArgs[] = $this->maybeReduce($reduce, $arg[1]);


            }
        }


<         foreach ($args as $arg) {
<             list($i, $name, $default, $isVariable) = $arg;



>         return [$positionalArgs, $keywordArgs, $names, $splatSeparator, $hasSplat];
>     }




<             if ($isVariable) {
<                 // only if more than one arg : can not be passed as position and value
<                 // see https://github.com/sass/libsass/issues/2927
<                 if (count($args) > 1) {
<                     if (isset($remaining[$i]) && isset($deferredNamedKeywordArgs[$name])) {
<                         throw $this->error("The argument $%s was passed both by position and by name.", $name);



>     /**
>      * @param bool         $reduce
>      * @param array|Number $value
>      *
>      * @return array|Number
>      */
>     private function maybeReduce($reduce, $value)
>     {
>         if ($reduce) {
>             return $this->reduce($value, true);


                    }

> 
                }
>         return $value;




<                 $val = [Type::T_LIST, \is_null($splatSeparator) ? ',' : $splatSeparator , [], $isVariable];



>     /**
>      * Apply argument values per definition
>      *
>      * @param array[]    $argDef
>      * @param array|null $argValues
>      * @param bool       $storeInEnv
>      * @param bool       $reduce     only used if $storeInEnv = false
>      *
>      * @return array<string, array|Number>
>      *
>      * @phpstan-param list<array{0: string, 1: array|Number|null, 2: bool}> $argDef
>      *
>      * @throws \Exception
>      */
>     protected function applyArguments($argDef, $argValues, $storeInEnv = true, $reduce = true)
>     {
>         $output = [];




<                 for ($count = \count($remaining); $i < $count; $i++) {
<                     $val[2][] = $remaining[$i];



>         if (\is_null($argValues)) {
>             $argValues = [];


                }


<                 foreach ($deferredKeywordArgs as $itemName => $item) {
<                     $val[2][$itemName] = $item;



>         if ($storeInEnv) {
>             $storeEnv = $this->getStoreEnv();
> 
>             $env = new Environment();
>             $env->store = $storeEnv->store;


                }


<                 foreach ($deferredNamedKeywordArgs as $itemName => $item) {
<                     $val[2][$itemName] = $item;



>         $prototype = ['arguments' => [], 'rest_argument' => null];
>         $originalRestArgumentName = null;
> 
>         foreach ($argDef as $arg) {
>             list($name, $default, $isVariable) = $arg;
>             $normalizedName = str_replace('_', '-', $name);
> 
>             if ($isVariable) {
>                 $originalRestArgumentName = $name;
>                 $prototype['rest_argument'] = $normalizedName;
>             } else {
>                 $prototype['arguments'][] = [$normalizedName, $name, !empty($default) ? $default : null];


                }

<             } elseif (isset($remaining[$i])) {
<                 $val = $remaining[$i];
<             } elseif (isset($keywordArgs[$name])) {
<                 $val = $keywordArgs[$name];
<             } elseif (! empty($default)) {



>         }
> 
>         list($positionalArgs, $namedArgs, $names, $splatSeparator, $hasSplat) = $this->evaluateArguments($argValues, $reduce);
> 
>         $this->verifyPrototype($prototype, \count($positionalArgs), $names, $hasSplat);
> 
>         $vars = $this->applyArgumentsToDeclaration($prototype, $positionalArgs, $namedArgs, $splatSeparator);
> 
>         foreach ($prototype['arguments'] as $argument) {
>             list($normalizedName, $name) = $argument;
> 
>             if (!isset($vars[$normalizedName])) {


                continue;

>             }
            } else {
> 
                throw $this->error("Missing argument $name");
>             $val = $vars[$normalizedName];
            }
> 

>             if ($storeInEnv) {
            if ($storeInEnv) {
>                 $this->set($name, $this->reduce($val, true), true, $env);



<                 throw $this->error("Missing argument $name");



>                 $output[$name] = ($reduce ? $this->reduce($val, true) : $val);
>             }


            } else {

>         if ($prototype['rest_argument'] !== null) {
                $output[$name] = ($reduce ? $this->reduce($val, true) : $val);
>             assert($originalRestArgumentName !== null);
            }
>             $name = $originalRestArgumentName;
        }
>             $val = $vars[$prototype['rest_argument']];

> 


        if ($storeInEnv) {
            $storeEnv->store = $env->store;
        }


<         foreach ($args as $arg) {
<             list($i, $name, $default, $isVariable) = $arg;



>         foreach ($prototype['arguments'] as $argument) {
>             list($normalizedName, $name, $default) = $argument;




<             if ($isVariable || isset($remaining[$i]) || isset($keywordArgs[$name]) || empty($default)) {



>             if (isset($vars[$normalizedName])) {


                continue;
            }

>             assert($default !== null);



            if ($storeInEnv) {
                $this->set($name, $this->reduce($default, true), true);
            } else {
                $output[$name] = ($reduce ? $this->reduce($default, true) : $default);
            }
        }

        return $output;
    }

    /**

>      * Apply argument values per definition.
     * Coerce a php value into a scss one
>      *
     *
>      * This method assumes that the arguments are valid for the provided prototype.
     * @param mixed $value
>      * The validation with {@see verifyPrototype} must have been run before calling
     *
>      * it.
     * @return array|Number
>      * Arguments are returned as a map from the normalized argument names to the
     */
>      * value. Additional arguments are collected in a sass argument list available
    protected function coerceValue($value)
>      * under the name of the rest argument in the result.
    {
>      *
        if (\is_array($value) || $value instanceof \ArrayAccess) {
>      * Defaults are not applied as they are resolved in a different environment.
            return $value;
>      *
        }
>      * @param array                       $prototype

>      * @param array<array|Number>         $positionalArgs
        if (\is_bool($value)) {
>      * @param array<string, array|Number> $namedArgs
            return $this->toBool($value);
>      * @param string|null                 $splatSeparator
        }
>      *

>      * @return array<string, array|Number>
        if (\is_null($value)) {
>      *
            return static::$null;
>      * @phpstan-param array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null} $prototype
        }
>      */

>     private function applyArgumentsToDeclaration(array $prototype, array $positionalArgs, array $namedArgs, $splatSeparator)
        if (is_numeric($value)) {
>     {
            return new Number($value, '');
>         $output = [];
        }
>         $minLength = min(\count($positionalArgs), \count($prototype['arguments']));

> 
        if ($value === '') {
>         for ($i = 0; $i < $minLength; $i++) {
            return static::$emptyString;
>             list($name) = $prototype['arguments'][$i];
        }
>             $val = $positionalArgs[$i];

> 
        $value = [Type::T_KEYWORD, $value];
>             $output[$name] = $val;
        $color = $this->coerceColor($value);
>         }

> 
        if ($color) {
>         $restNamed = $namedArgs;
            return $color;
> 
        }
>         for ($i = \count($positionalArgs); $i < \count($prototype['arguments']); $i++) {

>             $argument = $prototype['arguments'][$i];
        return $value;
>             list($name) = $argument;
    }
> 

>             if (isset($namedArgs[$name])) {
    /**
>                 $val = $namedArgs[$name];
     * Coerce something to map
>                 unset($restNamed[$name]);
     *
>             } else {
     * @param array|Number $item
>                 continue;
     *
>             }
     * @return array|Number
> 
     */
>             $output[$name] = $val;
    protected function coerceMap($item)
>         }
    {
> 
        if ($item[0] === Type::T_MAP) {
>         if ($prototype['rest_argument'] !== null) {
            return $item;
>             $name = $prototype['rest_argument'];
        }
>             $rest = array_values(array_slice($positionalArgs, \count($prototype['arguments'])));

> 
        if (
>             $val = [Type::T_LIST, \is_null($splatSeparator) ? ',' : $splatSeparator , $rest, $restNamed];
            $item[0] === static::$emptyList[0] &&
> 
            $item[1] === static::$emptyList[1] &&
>             $output[$name] = $val;
            $item[2] === static::$emptyList[2]
>         }
        ) {
> 
            return static::$emptyMap;
>         return $output;
        }
>     }

> 
        return $item;
>     /**



<         if (\is_array($value) || $value instanceof \ArrayAccess) {



>         if (\is_array($value) || $value instanceof Number) {



<      * Coerce something to map



>      * Tries to convert an item to a Sass map



<      * @param array|Number $item



>      * @param Number|array $item



<      * @return array|Number



>      * @return array|null



<     protected function coerceMap($item)



>     private function tryMap($item)


     * @param array   $item

>         if ($item instanceof Number) {
     * @param string  $delim
>             return null;
     * @param boolean $removeTrailingNull
>         }
     *
> 



<             $item[0] === static::$emptyList[0] &&
<             $item[1] === static::$emptyList[1] &&
<             $item[2] === static::$emptyList[2]



>             $item[0] === Type::T_LIST &&
>             $item[2] === []


    {

>         return null;
        if (isset($item) && $item[0] === Type::T_LIST) {
>     }
            // remove trailing null from the list
> 
            if ($removeTrailingNull && end($item[2]) === static::$null) {
>     /**
                array_pop($item[2]);
>      * Coerce something to map
            }
>      *

>      * @param array|Number $item
            return $item;
>      *
        }
>      * @return array|Number

>      */
        if (isset($item) && $item[0] === Type::T_MAP) {
>     protected function coerceMap($item)
            $keys = $item[1];
>     {
            $values = $item[2];
>         $map = $this->tryMap($item);
            $list = [];
> 

>         if ($map !== null) {
            for ($i = 0, $s = \count($keys); $i < $s; $i++) {
>             return $map;
                $key = $keys[$i];
>         }
                $value = $values[$i];
> 



<      * @param array   $item



>      * @param array|Number $item



<      * @param boolean $removeTrailingNull



>      * @param bool         $removeTrailingNull



<         if (isset($item) && $item[0] === Type::T_LIST) {



>         if ($item instanceof Number) {
>             return [Type::T_LIST, '', [$item]];
>         }
> 
>         if ($item[0] === Type::T_LIST) {



<         if (isset($item) && $item[0] === Type::T_MAP) {



>         if ($item[0] === Type::T_MAP) {



<                 switch ($key[0]) {
<                     case Type::T_LIST:
<                     case Type::T_MAP:
<                     case Type::T_STRING:
<                     case Type::T_NULL:
<                         break;
< 
<                     default:
<                         $key = [Type::T_KEYWORD, $this->compileStringContent($this->coerceString($key))];
<                         break;
<                 }
< 


                    [$key, $value]
                ];
            }


<             return [Type::T_LIST, ',', $list];



>             return [Type::T_LIST, $list ? ',' : '', $list];


        }


<         return [Type::T_LIST, $delim, ! isset($item) ? [] : [$item]];



>         return [Type::T_LIST, '', [$item]];


    }

    /**
     * Coerce color for expression
     *
     * @param array|Number $value
     *
     * @return array|Number
     */
    protected function coerceForExpression($value)
    {
        if ($color = $this->coerceColor($value)) {
            return $color;
        }

        return $value;
    }

    /**
     * Coerce value to color
     *
     * @param array|Number $value
     * @param bool         $inRGBFunction
     *
     * @return array|null
     */
    protected function coerceColor($value, $inRGBFunction = false)
    {

>         if ($value instanceof Number) {
        switch ($value[0]) {
>             return null;
            case Type::T_COLOR:
>         }
                for ($i = 1; $i <= 3; $i++) {
> 


                    if (! is_numeric($value[$i])) {
                        $cv = $this->compileRGBAValue($value[$i]);

                        if (! is_numeric($cv)) {
                            return null;
                        }

                        $value[$i] = $cv;
                    }

                    if (isset($value[4])) {
                        if (! is_numeric($value[4])) {
                            $cv = $this->compileRGBAValue($value[4], true);

                            if (! is_numeric($cv)) {
                                return null;
                            }

                            $value[4] = $cv;
                        }
                    }
                }

                return $value;

            case Type::T_LIST:
                if ($inRGBFunction) {
                    if (\count($value[2]) == 3 || \count($value[2]) == 4) {
                        $color = $value[2];
                        array_unshift($color, Type::T_COLOR);

                        return $this->coerceColor($color);
                    }
                }

                return null;

            case Type::T_KEYWORD:
                if (! \is_string($value[1])) {
                    return null;
                }

                $name = strtolower($value[1]);

                // hexa color?
                if (preg_match('/^#([0-9a-f]+)$/i', $name, $m)) {
                    $nofValues = \strlen($m[1]);

                    if (\in_array($nofValues, [3, 4, 6, 8])) {
                        $nbChannels = 3;
                        $color      = [];
                        $num        = hexdec($m[1]);

                        switch ($nofValues) {
                            case 4:
                                $nbChannels = 4;
                                // then continuing with the case 3:
                            case 3:
                                for ($i = 0; $i < $nbChannels; $i++) {
                                    $t = $num & 0xf;
                                    array_unshift($color, $t << 4 | $t);
                                    $num >>= 4;
                                }

                                break;

                            case 8:
                                $nbChannels = 4;
                                // then continuing with the case 6:
                            case 6:
                                for ($i = 0; $i < $nbChannels; $i++) {
                                    array_unshift($color, $num & 0xff);
                                    $num >>= 8;
                                }

                                break;
                        }

                        if ($nbChannels === 4) {
                            if ($color[3] === 255) {
                                $color[3] = 1; // fully opaque
                            } else {
                                $color[3] = round($color[3] / 255, Number::PRECISION);
                            }
                        }

                        array_unshift($color, Type::T_COLOR);

                        return $color;
                    }
                }

                if ($rgba = Colors::colorNameToRGBa($name)) {
                    return isset($rgba[3])
                        ? [Type::T_COLOR, $rgba[0], $rgba[1], $rgba[2], $rgba[3]]
                        : [Type::T_COLOR, $rgba[0], $rgba[1], $rgba[2]];
                }

                return null;
        }

        return null;
    }

    /**

<      * @param integer|Number $value
<      * @param boolean        $isAlpha



>      * @param int|Number $value
>      * @param bool       $isAlpha


     *

<      * @return integer|mixed



>      * @return int|mixed


     */
    protected function compileRGBAValue($value, $isAlpha = false)
    {
        if ($isAlpha) {
            return $this->compileColorPartValue($value, 0, 1, false);
        }

        return $this->compileColorPartValue($value, 0, 255, true);
    }

    /**
     * @param mixed         $value

<      * @param integer|float $min
<      * @param integer|float $max
<      * @param boolean       $isInt



>      * @param int|float $min
>      * @param int|float $max
>      * @param bool      $isInt


     *

<      * @return integer|mixed



>      * @return int|mixed


     */
    protected function compileColorPartValue($value, $min, $max, $isInt = true)
    {
        if (! is_numeric($value)) {
            if (\is_array($value)) {
                $reduced = $this->reduce($value);

                if ($reduced instanceof Number) {
                    $value = $reduced;
                }
            }

            if ($value instanceof Number) {
                if ($value->unitless()) {
                    $num = $value->getDimension();
                } elseif ($value->hasUnit('%')) {
                    $num = $max * $value->getDimension() / 100;
                } else {
                    throw $this->error('Expected %s to have no units or "%%".', $value);
                }

                $value = $num;
            } elseif (\is_array($value)) {
                $value = $this->compileValue($value);
            }
        }

        if (is_numeric($value)) {
            if ($isInt) {
                $value = round($value);
            }

            $value = min($max, max($min, $value));

            return $value;
        }

        return $value;
    }

    /**
     * Coerce value to string
     *
     * @param array|Number $value
     *
     * @return array
     */
    protected function coerceString($value)
    {
        if ($value[0] === Type::T_STRING) {

>             assert(\is_array($value));
            return $value;
> 


        }

        return [Type::T_STRING, '', [$this->compileValue($value)]];
    }

    /**

<      * Assert value is a string (or keyword)



>      * Assert value is a string
>      *
>      * This method deals with internal implementation details of the value
>      * representation where unquoted strings can sometimes be stored under
>      * other types.
>      * The returned value is always using the T_STRING type.


     *
     * @api
     *
     * @param array|Number $value

<      * @param string $varName



>      * @param string|null  $varName


     *
     * @return array
     *

<      * @throws \Exception



>      * @throws SassScriptException


     */
    public function assertString($value, $varName = null)
    {
        // case of url(...) parsed a a function
        if ($value[0] === Type::T_FUNCTION) {
            $value = $this->coerceString($value);
        }

        if (! \in_array($value[0], [Type::T_STRING, Type::T_KEYWORD])) {
            $value = $this->compileValue($value);

<             $var_display = ($varName ? " \${$varName}:" : '');
<             throw $this->error("Error:{$var_display} $value is not a string.");



>             throw SassScriptException::forArgument("$value is not a string.", $varName);


        }


<         $value = $this->coerceString($value);
< 
<         return $value;



>         return $this->coerceString($value);


    }

    /**
     * Coerce value to a percentage
     *
     * @param array|Number $value
     *

<      * @return integer|float



>      * @return int|float
>      *
>      * @deprecated


     */
    protected function coercePercent($value)
    {

>         @trigger_error(sprintf('"%s" is deprecated since 1.7.0.', __METHOD__), E_USER_DEPRECATED);
        if ($value instanceof Number) {
> 


            if ($value->hasUnit('%')) {
                return $value->getDimension() / 100;
            }

            return $value->getDimension();
        }

        return 0;
    }

    /**
     * Assert value is a map
     *
     * @api
     *
     * @param array|Number $value

>      * @param string|null  $varName


     *
     * @return array
     *

<      * @throws \Exception



>      * @throws SassScriptException


     */

<     public function assertMap($value)



>     public function assertMap($value, $varName = null)


    {

<         $value = $this->coerceMap($value);



>         $map = $this->tryMap($value);
> 
>         if ($map === null) {
>             $value = $this->compileValue($value);




<         if ($value[0] !== Type::T_MAP) {
<             throw $this->error('expecting map, %s received', $value[0]);



>             throw SassScriptException::forArgument("$value is not a map.", $varName);


        }


<         return $value;



>         return $map;


    }

    /**
     * Assert value is a list
     *
     * @api
     *
     * @param array|Number $value
     *
     * @return array
     *
     * @throws \Exception
     */
    public function assertList($value)
    {
        if ($value[0] !== Type::T_LIST) {
            throw $this->error('expecting list, %s received', $value[0]);
        }

>         assert(\is_array($value));



        return $value;
    }

    /**

>      * Gets the keywords of an argument list.
     * Assert value is a color
>      *
     *
>      * Keys in the returned array are normalized names (underscores are replaced with dashes)
     * @api
>      * without the leading `$`.
     *
>      * Calling this helper with anything that an argument list received for a rest argument
     * @param array|Number $value
>      * of the function argument declaration is not supported.
     *
>      *
     * @return array
>      * @param array|Number $value
     *
>      *
     * @throws \Exception
>      * @return array<string, array|Number>
     */
>      */
    public function assertColor($value)
>     public function getArgumentListKeywords($value)
    {
>     {
        if ($color = $this->coerceColor($value)) {
>         if ($value[0] !== Type::T_LIST || !isset($value[3]) || !\is_array($value[3])) {
            return $color;
>             throw new \InvalidArgumentException('The argument is not a sass argument list.');
        }
>         }

> 
        throw $this->error('expecting color, %s received', $value[0]);
>         return $value[3];
    }
>     }

> 
    /**
>     /**


     * Assert value is a number

>      * @param string|null  $varName



<      * @throws \Exception



>      * @throws SassScriptException



<     public function assertColor($value)



>     public function assertColor($value, $varName = null)



<         throw $this->error('expecting color, %s received', $value[0]);



>         $value = $this->compileValue($value);
> 
>         throw SassScriptException::forArgument("$value is not a color.", $varName);


     * @param array|Number $value

<      * @param string $varName



>      * @param string|null  $varName


     *
     * @return Number
     *

<      * @throws \Exception



>      * @throws SassScriptException


     */
    public function assertNumber($value, $varName = null)
    {
        if (!$value instanceof Number) {
            $value = $this->compileValue($value);

<             $var_display = ($varName ? " \${$varName}:" : '');
<             throw $this->error("Error:{$var_display} $value is not a number.");



>             throw SassScriptException::forArgument("$value is not a number.", $varName);


        }

        return $value;
    }

    /**
     * Assert value is a integer
     *
     * @api
     *
     * @param array|Number $value

<      * @param string $varName



>      * @param string|null  $varName


     *

<      * @return integer



>      * @return int


     *

<      * @throws \Exception



>      * @throws SassScriptException


     */
    public function assertInteger($value, $varName = null)
    {

< 


        $value = $this->assertNumber($value, $varName)->getDimension();
        if (round($value - \intval($value), Number::PRECISION) > 0) {

<             $var_display = ($varName ? " \${$varName}:" : '');
<             throw $this->error("Error:{$var_display} $value is not an integer.");



>             throw SassScriptException::forArgument("$value is not an integer.", $varName);


        }

        return intval($value);
    }


>     /**

>      * Extract the  ... / alpha on the last argument of channel arg
    /**
>      * in color functions
     * Make sure a color's components don't go out of bounds
>      *
     *
>      * @param array $args
     * @param array $c
>      * @return array
     *
>      */
     * @return array
>     private function extractSlashAlphaInColorFunction($args)
     */
>     {
    protected function fixColor($c)
>         $last = end($args);
    {
>         if (\count($args) === 3 && $last[0] === Type::T_EXPRESSION && $last[1] === '/') {
        foreach ([1, 2, 3] as $i) {
>             array_pop($args);
            if ($c[$i] < 0) {
>             $args[] = $last[2];
                $c[$i] = 0;
>             $args[] = $last[3];
            }
>         }

>         return $args;
            if ($c[$i] > 255) {
>     }
                $c[$i] = 255;
> 


            }

> 
        }
>             if (!\is_int($c[$i])) {

>                 $c[$i] = round($c[$i]);
        return $c;
>             }


    }

    /**
     * Convert RGB to HSL
     *

<      * @api



>      * @internal


     *

<      * @param integer $red
<      * @param integer $green
<      * @param integer $blue



>      * @param int $red
>      * @param int $green
>      * @param int $blue


     *
     * @return array
     */
    public function toHSL($red, $green, $blue)
    {
        $min = min($red, $green, $blue);
        $max = max($red, $green, $blue);

        $l = $min + $max;
        $d = $max - $min;

        if ((int) $d === 0) {
            $h = $s = 0;
        } else {
            if ($l < 255) {
                $s = $d / $l;
            } else {
                $s = $d / (510 - $l);
            }

            if ($red == $max) {
                $h = 60 * ($green - $blue) / $d;
            } elseif ($green == $max) {
                $h = 60 * ($blue - $red) / $d + 120;

<             } elseif ($blue == $max) {



>             } else {


                $h = 60 * ($red - $green) / $d + 240;
            }
        }


<         return [Type::T_HSL, fmod($h, 360), $s * 100, $l / 5.1];



>         return [Type::T_HSL, fmod($h + 360, 360), $s * 100, $l / 5.1];


    }

    /**
     * Hue to RGB helper
     *
     * @param float $m1
     * @param float $m2
     * @param float $h
     *
     * @return float
     */
    protected function hueToRGB($m1, $m2, $h)
    {
        if ($h < 0) {
            $h += 1;
        } elseif ($h > 1) {
            $h -= 1;
        }

        if ($h * 6 < 1) {
            return $m1 + ($m2 - $m1) * $h * 6;
        }

        if ($h * 2 < 1) {
            return $m2;
        }

        if ($h * 3 < 2) {
            return $m1 + ($m2 - $m1) * (2 / 3 - $h) * 6;
        }

        return $m1;
    }

    /**
     * Convert HSL to RGB
     *

<      * @api



>      * @internal


     *

<      * @param integer $hue        H from 0 to 360
<      * @param integer $saturation S from 0 to 100
<      * @param integer $lightness  L from 0 to 100



>      * @param int|float $hue        H from 0 to 360
>      * @param int|float $saturation S from 0 to 100
>      * @param int|float $lightness  L from 0 to 100


     *
     * @return array
     */
    public function toRGB($hue, $saturation, $lightness)
    {
        if ($hue < 0) {
            $hue += 360;
        }

        $h = $hue / 360;
        $s = min(100, max(0, $saturation)) / 100;
        $l = min(100, max(0, $lightness)) / 100;

        $m2 = $l <= 0.5 ? $l * ($s + 1) : $l + $s - $l * $s;
        $m1 = $l * 2 - $m2;

        $r = $this->hueToRGB($m1, $m2, $h + 1 / 3) * 255;
        $g = $this->hueToRGB($m1, $m2, $h) * 255;
        $b = $this->hueToRGB($m1, $m2, $h - 1 / 3) * 255;

        $out = [Type::T_COLOR, $r, $g, $b];

        return $out;
    }


>     /**
    // Built in functions
>      * Convert HWB to RGB

>      * https://www.w3.org/TR/css-color-4/#hwb-to-rgb
    protected static $libCall = ['function', 'args...'];
>      *
    protected function libCall($args, $kwargs)
>      * @api
    {
>      *
        $functionReference = array_shift($args);
>      * @param int|float $hue        H from 0 to 360

>      * @param int|float $whiteness  W from 0 to 100
        if (in_array($functionReference[0], [Type::T_STRING, Type::T_KEYWORD])) {
>      * @param int|float $blackness  B from 0 to 100
            $name = $this->compileStringContent($this->coerceString($functionReference));
>      *
            $warning = "DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal\n"
>      * @return array
                . "in Sass 4.0. Use call(function-reference($name)) instead.";
>      */
            fwrite($this->stderr, "$warning\n\n");
>     private function HWBtoRGB($hue, $whiteness, $blackness)
            $functionReference = $this->libGetFunction([$functionReference]);
>     {
        }
>         $w = min(100, max(0, $whiteness)) / 100;

>         $b = min(100, max(0, $blackness)) / 100;
        if ($functionReference === static::$null) {
> 
            return static::$null;
>         $sum = $w + $b;
        }
>         if ($sum > 1.0) {

>             $w = $w / $sum;
        if (! in_array($functionReference[0], [Type::T_FUNCTION_REFERENCE, Type::T_FUNCTION])) {
>             $b = $b / $sum;
            throw $this->error('Function reference expected, got ' . $functionReference[0]);
>         }
        }
>         $b = min(1.0 - $w, $b);

> 
        $callArgs = [];
>         $rgb = $this->toRGB($hue, 100, 50);

>         for($i = 1; $i < 4; $i++) {
        // $kwargs['args'] is [Type::T_LIST, ',', [..]]
>           $rgb[$i] *= (1.0 - $w - $b);
        foreach ($kwargs['args'][2] as $varname => $arg) {
>           $rgb[$i] = round($rgb[$i] + 255 * $w + 0.0001);
            if (is_numeric($varname)) {
>         }
                $varname = null;
> 
            } else {
>         return $rgb;
                $varname = [ 'var', $varname];
>     }
            }
> 

>     /**
            $callArgs[] = [$varname, $arg, false];
>      * Convert RGB to HWB
        }
>      *

>      * @api
        return $this->reduce([Type::T_FUNCTION_CALL, $functionReference, $callArgs]);
>      *
    }
>      * @param int $red

>      * @param int $green

>      * @param int $blue
    protected static $libGetFunction = [
>      *
        ['name'],
>      * @return array
        ['name', 'css']
>      */
    ];
>     private function RGBtoHWB($red, $green, $blue)
    protected function libGetFunction($args)
>     {
    {
>         $min = min($red, $green, $blue);
        $name = $this->compileStringContent($this->coerceString(array_shift($args)));
>         $max = max($red, $green, $blue);
        $isCss = false;
> 

>         $d = $max - $min;
        if (count($args)) {
> 
            $isCss = array_shift($args);
>         if ((int) $d === 0) {
            $isCss = (($isCss === static::$true) ? true : false);
>             $h = 0;
        }
>         } else {

> 
        if ($isCss) {
>             if ($red == $max) {
            return [Type::T_FUNCTION, $name, [Type::T_LIST, ',', []]];
>                 $h = 60 * ($green - $blue) / $d;
        }
>             } elseif ($green == $max) {

>                 $h = 60 * ($blue - $red) / $d + 120;
        return $this->getFunctionReference($name, true);
>             } else {
    }
>                 $h = 60 * ($red - $green) / $d + 240;

>             }
    protected static $libIf = ['condition', 'if-true', 'if-false:'];
>         }
    protected function libIf($args)
> 
    {
>         return [Type::T_HWB, fmod($h, 360), $min / 255 * 100, 100 - $max / 255 *100];
        list($cond, $t, $f) = $args;
>     }

> 
        if (! $this->isTruthy($this->reduce($cond, true))) {
> 



<     protected function libCall($args, $kwargs)



>     protected function libCall($args)



<         $functionReference = array_shift($args);



>         $functionReference = $args[0];



<             $warning = "DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal\n"



>             $warning = "Passing a string to call() is deprecated and will be illegal\n"



<             fwrite($this->stderr, "$warning\n\n");
<             $functionReference = $this->libGetFunction([$functionReference]);



>             Warn::deprecation($warning);
>             $functionReference = $this->libGetFunction([$this->assertString($functionReference, 'function')]);



<         $callArgs = [];
< 
<         // $kwargs['args'] is [Type::T_LIST, ',', [..]]
<         foreach ($kwargs['args'][2] as $varname => $arg) {
<             if (is_numeric($varname)) {
<                 $varname = null;
<             } else {
<                 $varname = [ 'var', $varname];
<             }
< 
<             $callArgs[] = [$varname, $arg, false];
<         }



>         $callArgs = [
>             [null, $args[1], true]
>         ];



<         $name = $this->compileStringContent($this->coerceString(array_shift($args)));



>         $name = $this->compileStringContent($this->assertString(array_shift($args), 'name'));


        }

        if ($list[0] !== Type::T_LIST) {
            return static::$null;
        }

        // Numbers are represented with value objects, for which the PHP equality operator does not
        // match the Sass rules (and we cannot overload it). As they are the only type of values
        // represented with a value object for now, they require a special case.
        if ($value instanceof Number) {
            $key = 0;
            foreach ($list[2] as $item) {
                $key++;
                $itemValue = $this->normalizeValue($item);

                if ($itemValue instanceof Number && $value->equals($itemValue)) {
                    return new Number($key, '');
                }
            }
            return static::$null;
        }

        $values = [];


< 


        foreach ($list[2] as $item) {
            $values[] = $this->normalizeValue($item);
        }

        $key = array_search($this->normalizeValue($value), $values);


<         return false === $key ? static::$null : $key + 1;



>         return false === $key ? static::$null : new Number($key + 1, '');


    }

    protected static $libRgb = [
        ['color'],
        ['color', 'alpha'],
        ['channels'],
        ['red', 'green', 'blue'],
        ['red', 'green', 'blue', 'alpha'] ];

> 
    protected function libRgb($args, $kwargs, $funcName = 'rgb')
>     /**
    {
>      * @param array $args
        switch (\count($args)) {
>      * @param array $kwargs
            case 1:
>      * @param string $funcName
                if (! $color = $this->coerceColor($args[0], true)) {
>      *
                    $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ')']];
>      * @return array
                }
>      */


                break;

            case 3:
                $color = [Type::T_COLOR, $args[0], $args[1], $args[2]];

                if (! $color = $this->coerceColor($color)) {
                    $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ', ', $args[1], ', ', $args[2], ')']];
                }

                return $color;

            case 2:
                if ($color = $this->coerceColor($args[0], true)) {
                    $alpha = $this->compileRGBAValue($args[1], true);

                    if (is_numeric($alpha)) {
                        $color[4] = $alpha;
                    } else {
                        $color = [Type::T_STRING, '',
                            [$funcName . '(', $color[1], ', ', $color[2], ', ', $color[3], ', ', $alpha, ')']];
                    }
                } else {

<                     $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ')']];



>                     $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ', ', $args[1], ')']];


                }
                break;

            case 4:
            default:
                $color = [Type::T_COLOR, $args[0], $args[1], $args[2], $args[3]];

                if (! $color = $this->coerceColor($color)) {
                    $color = [Type::T_STRING, '',
                        [$funcName . '(', $args[0], ', ', $args[1], ', ', $args[2], ', ', $args[3], ')']];
                }
                break;
        }

        return $color;
    }

    protected static $libRgba = [
        ['color'],
        ['color', 'alpha'],
        ['channels'],
        ['red', 'green', 'blue'],
        ['red', 'green', 'blue', 'alpha'] ];
    protected function libRgba($args, $kwargs)
    {
        return $this->libRgb($args, $kwargs, 'rgba');
    }

    /**
     * Helper function for adjust_color, change_color, and scale_color
     *
     * @param array<array|Number> $args

>      * @param string $operation


     * @param callable $fn
     *
     * @return array

>      *
     */
>      * @phpstan-param callable(float|int, float|int|null, float|int): (float|int) $fn



<     protected function alterColor($args, $fn)



>     protected function alterColor(array $args, $operation, $fn)


    {

<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');
> 
>         if ($args[1][2]) {
>             throw new SassScriptException('Only one positional argument is allowed. All other arguments must be passed by name.');
>         }




<         foreach ([1 => 1, 2 => 2, 3 => 3, 7 => 4] as $iarg => $irgba) {
<             if (isset($args[$iarg])) {
<                 $val = $this->assertNumber($args[$iarg])->getDimension();



>         $kwargs = $this->getArgumentListKeywords($args[1]);




<                 if (! isset($color[$irgba])) {
<                     $color[$irgba] = (($irgba < 4) ? 0 : 1);



>         $scale = $operation === 'scale';
>         $change = $operation === 'change';
> 
>         /** @phpstan-var callable(string, float|int, bool=, bool=): (float|int|null) $getParam */
>         $getParam = function ($name, $max, $checkPercent = false, $assertPercent = false) use (&$kwargs, $scale, $change) {
>             if (!isset($kwargs[$name])) {
>                 return null;


                }


<                 $color[$irgba] = \call_user_func($fn, $color[$irgba], $val, $iarg);



>             $number = $this->assertNumber($kwargs[$name], $name);
>             unset($kwargs[$name]);
> 
>             if (!$scale && $checkPercent) {
>                 if (!$number->hasUnit('%')) {
>                     $warning = $this->error("{$name} Passing a number `$number` without unit % is deprecated.");
>                     $this->logger->warn($warning->getMessage(), true);


            }
        }


<         if (! empty($args[4]) || ! empty($args[5]) || ! empty($args[6])) {
<             $hsl = $this->toHSL($color[1], $color[2], $color[3]);



>             if ($scale || $assertPercent) {
>                 $number->assertUnit('%', $name);
>             }
> 
>             if ($scale) {
>                 $max = 100;
>             }
> 
>             if ($scale || $assertPercent) {
>                 return $number->valueInRange($change ? 0 : -$max, $max, $name);
>             }
> 
>             return $number->valueInRangeWithUnit($change ? 0 : -$max, $max, $name, $checkPercent ? '%' : '');
>         };
> 
>         $alpha = $getParam('alpha', 1);
>         $red = $getParam('red', 255);
>         $green = $getParam('green', 255);
>         $blue = $getParam('blue', 255);
> 
>         if ($scale || !isset($kwargs['hue'])) {
>             $hue = null;
>         } else {
>             $hueNumber = $this->assertNumber($kwargs['hue'], 'hue');
>             unset($kwargs['hue']);
>             $hue = $hueNumber->getDimension();
>         }
>         $saturation = $getParam('saturation', 100, true);
>         $lightness = $getParam('lightness', 100, true);
>         $whiteness = $getParam('whiteness', 100, false, true);
>         $blackness = $getParam('blackness', 100, false, true);
> 
>         if (!empty($kwargs)) {
>             $unknownNames = array_keys($kwargs);
>             $lastName = array_pop($unknownNames);
>             $message = sprintf(
>                 'No argument%s named $%s%s.',
>                 $unknownNames ? 's' : '',
>                 $unknownNames ? implode(', $', $unknownNames) . ' or $' : '',
>                 $lastName
>             );
>             throw new SassScriptException($message);
>         }
> 
>         $hasRgb = $red !== null || $green !== null || $blue !== null;
>         $hasSL = $saturation !== null || $lightness !== null;
>         $hasWB = $whiteness !== null || $blackness !== null;
> 
>         if ($hasRgb && ($hasSL || $hasWB || $hue !== null)) {
>             throw new SassScriptException(sprintf('RGB parameters may not be passed along with %s parameters.', $hasWB ? 'HWB' : 'HSL'));
>         }
> 
>         if ($hasWB && $hasSL) {
>             throw new SassScriptException('HSL parameters may not be passed along with HWB parameters.');
>         }




<             foreach ([4 => 1, 5 => 2, 6 => 3] as $iarg => $ihsl) {
<                 if (! empty($args[$iarg])) {
<                     $val = $this->assertNumber($args[$iarg])->getDimension();
<                     $hsl[$ihsl] = \call_user_func($fn, $hsl[$ihsl], $val, $iarg);



>         if ($hasRgb) {
>             $color[1] = round($fn($color[1], $red, 255));
>             $color[2] = round($fn($color[2], $green, 255));
>             $color[3] = round($fn($color[3], $blue, 255));
>         } elseif ($hasWB) {
>             $hwb = $this->RGBtoHWB($color[1], $color[2], $color[3]);
>             if ($hue !== null) {
>                 $hwb[1] = $change ? $hue : $hwb[1] + $hue;


                }

>             $hwb[2] = $fn($hwb[2], $whiteness, 100);
            }
>             $hwb[3] = $fn($hwb[3], $blackness, 100);

> 
            $rgb = $this->toRGB($hsl[1], $hsl[2], $hsl[3]);
>             $rgb = $this->HWBtoRGB($hwb[1], $hwb[2], $hwb[3]);

> 
            if (isset($color[4])) {
>             if (isset($color[4])) {
                $rgb[4] = $color[4];
>                 $rgb[4] = $color[4];


            }

>             $color = $rgb;

>         } elseif ($hue !== null || $hasSL) {
            $color = $rgb;
>             $hsl = $this->toHSL($color[1], $color[2], $color[3]);
        }
> 

>             if ($hue !== null) {
        return $color;
>                 $hsl[1] = $change ? $hue : $hsl[1] + $hue;
    }
>             }

>             $hsl[2] = $fn($hsl[2], $saturation, 100);
    protected static $libAdjustColor = [
>             $hsl[3] = $fn($hsl[3], $lightness, 100);
        'color', 'red:null', 'green:null', 'blue:null',
> 


        'hue:null', 'saturation:null', 'lightness:null', 'alpha:null'

>         if ($alpha !== null) {
    ];
>             $existingAlpha = isset($color[4]) ? $color[4] : 1;
    protected function libAdjustColor($args)
>             $color[4] = $fn($existingAlpha, $alpha, 1);
    {
>         }
        return $this->alterColor($args, function ($base, $alter, $i) {
> 



<     protected static $libAdjustColor = [
<         'color', 'red:null', 'green:null', 'blue:null',
<         'hue:null', 'saturation:null', 'lightness:null', 'alpha:null'
<     ];



>     protected static $libAdjustColor = ['color', 'kwargs...'];



<         return $this->alterColor($args, function ($base, $alter, $i) {
<             return $base + $alter;



>         return $this->alterColor($args, 'adjust', function ($base, $alter, $max) {
>             if ($alter === null) {
>                 return $base;
>             }
> 
>             $new = $base + $alter;
> 
>             if ($new < 0) {
>                 return 0;
>             }
> 
>             if ($new > $max) {
>                 return $max;
>             }
> 
>             return $new;



<     protected static $libChangeColor = [
<         'color', 'red:null', 'green:null', 'blue:null',
<         'hue:null', 'saturation:null', 'lightness:null', 'alpha:null'
<     ];



>     protected static $libChangeColor = ['color', 'kwargs...'];



<         return $this->alterColor($args, function ($base, $alter, $i) {



>         return $this->alterColor($args,'change', function ($base, $alter, $max) {
>             if ($alter === null) {
>                 return $base;
>             }
> 


            return $alter;
        });
    }


<     protected static $libScaleColor = [
<         'color', 'red:null', 'green:null', 'blue:null',
<         'hue:null', 'saturation:null', 'lightness:null', 'alpha:null'
<     ];



>     protected static $libScaleColor = ['color', 'kwargs...'];


    protected function libScaleColor($args)
    {

<         return $this->alterColor($args, function ($base, $scale, $i) {
<             // 1, 2, 3 - rgb
<             // 4, 5, 6 - hsl
<             // 7 - a
<             switch ($i) {
<                 case 1:
<                 case 2:
<                 case 3:
<                     $max = 255;
<                     break;
< 
<                 case 4:
<                     $max = 360;
<                     break;
< 
<                 case 7:
<                     $max = 1;
<                     break;
< 
<                 default:
<                     $max = 100;



>         return $this->alterColor($args, 'scale', function ($base, $scale, $max) {
>             if ($scale === null) {
>                 return $base;


            }

            $scale = $scale / 100;

            if ($scale < 0) {
                return $base * $scale + $base;
            }

            return ($max - $base) * $scale + $base;
        });
    }

    protected static $libIeHexStr = ['color'];
    protected function libIeHexStr($args)
    {
        $color = $this->coerceColor($args[0]);

        if (\is_null($color)) {
            throw $this->error('Error: argument `$color` of `ie-hex-str($color)` must be a color');
        }

        $color[4] = isset($color[4]) ? round(255 * $color[4]) : 255;

        return [Type::T_STRING, '', [sprintf('#%02X%02X%02X%02X', $color[4], $color[1], $color[2], $color[3])]];
    }

    protected static $libRed = ['color'];
    protected function libRed($args)
    {
        $color = $this->coerceColor($args[0]);

        if (\is_null($color)) {
            throw $this->error('Error: argument `$color` of `red($color)` must be a color');
        }


<         return $color[1];



>         return new Number((int) $color[1], '');


    }

    protected static $libGreen = ['color'];
    protected function libGreen($args)
    {
        $color = $this->coerceColor($args[0]);

        if (\is_null($color)) {
            throw $this->error('Error: argument `$color` of `green($color)` must be a color');
        }


<         return $color[2];



>         return new Number((int) $color[2], '');


    }

    protected static $libBlue = ['color'];
    protected function libBlue($args)
    {
        $color = $this->coerceColor($args[0]);

        if (\is_null($color)) {
            throw $this->error('Error: argument `$color` of `blue($color)` must be a color');
        }


<         return $color[3];



>         return new Number((int) $color[3], '');


    }

    protected static $libAlpha = ['color'];
    protected function libAlpha($args)
    {
        if ($color = $this->coerceColor($args[0])) {

<             return isset($color[4]) ? $color[4] : 1;



>             return new Number(isset($color[4]) ? $color[4] : 1, '');


        }

        // this might be the IE function, so return value unchanged
        return null;
    }

    protected static $libOpacity = ['color'];
    protected function libOpacity($args)
    {
        $value = $args[0];

        if ($value instanceof Number) {
            return null;
        }

        return $this->libAlpha($args);
    }

    // mix two colors
    protected static $libMix = [

<         ['color1', 'color2', 'weight:0.5'],
<         ['color-1', 'color-2', 'weight:0.5']



>         ['color1', 'color2', 'weight:50%'],
>         ['color-1', 'color-2', 'weight:50%']


        ];
    protected function libMix($args)
    {
        list($first, $second, $weight) = $args;


<         $first = $this->assertColor($first);
<         $second = $this->assertColor($second);
< 
<         if (! isset($weight)) {
<             $weight = 0.5;
<         } else {
<             $weight = $this->coercePercent($weight);
<         }



>         $first = $this->assertColor($first, 'color1');
>         $second = $this->assertColor($second, 'color2');
>         $weightScale = $this->assertNumber($weight, 'weight')->valueInRange(0, 100, 'weight') / 100;



        $firstAlpha = isset($first[4]) ? $first[4] : 1;
        $secondAlpha = isset($second[4]) ? $second[4] : 1;


<         $w = $weight * 2 - 1;
<         $a = $firstAlpha - $secondAlpha;



>         $normalizedWeight = $weightScale * 2 - 1;
>         $alphaDistance = $firstAlpha - $secondAlpha;




<         $w1 = (($w * $a === -1 ? $w : ($w + $a) / (1 + $w * $a)) + 1) / 2.0;
<         $w2 = 1.0 - $w1;



>         $combinedWeight = $normalizedWeight * $alphaDistance == -1 ? $normalizedWeight : ($normalizedWeight + $alphaDistance) / (1 + $normalizedWeight * $alphaDistance);
>         $weight1 = ($combinedWeight + 1) / 2.0;
>         $weight2 = 1.0 - $weight1;



        $new = [Type::T_COLOR,

<             $w1 * $first[1] + $w2 * $second[1],
<             $w1 * $first[2] + $w2 * $second[2],
<             $w1 * $first[3] + $w2 * $second[3],



>             $weight1 * $first[1] + $weight2 * $second[1],
>             $weight1 * $first[2] + $weight2 * $second[2],
>             $weight1 * $first[3] + $weight2 * $second[3],


        ];

        if ($firstAlpha != 1.0 || $secondAlpha != 1.0) {

<             $new[] = $firstAlpha * $weight + $secondAlpha * (1 - $weight);



>             $new[] = $firstAlpha * $weightScale + $secondAlpha * (1 - $weightScale);


        }

        return $this->fixColor($new);
    }

    protected static $libHsl = [
        ['channels'],

>         ['hue', 'saturation'],


        ['hue', 'saturation', 'lightness'],
        ['hue', 'saturation', 'lightness', 'alpha'] ];

> 
    protected function libHsl($args, $kwargs, $funcName = 'hsl')
>     /**
    {
>      * @param array $args
        $args_to_check = $args;
>      * @param array $kwargs

>      * @param string $funcName
        if (\count($args) == 1) {
>      *
            if ($args[0][0] !== Type::T_LIST || \count($args[0][2]) < 3 || \count($args[0][2]) > 4) {
>      * @return array|null
                return [Type::T_STRING, '', [$funcName . '(', $args[0], ')']];
>      */


            }

            $args = $args[0][2];
            $args_to_check = $kwargs['channels'][2];
        }


<         foreach ($kwargs as $k => $arg) {
<             if (in_array($arg[0], [Type::T_FUNCTION_CALL]) && in_array($arg[1], ['min', 'max'])) {



>         if (\count($args) === 2) {
>             // if var() is used as an argument, return as a css function
>             foreach ($args as $arg) {
>                 if ($arg[0] === Type::T_FUNCTION && in_array($arg[1], ['var'])) {
>                     return null;
>                 }
>             }
> 
>             throw new SassScriptException('Missing argument $lightness.');
>         }
> 
>         foreach ($kwargs as $arg) {
>             if (in_array($arg[0], [Type::T_FUNCTION_CALL, Type::T_FUNCTION]) && in_array($arg[1], ['min', 'max'])) {


                return null;
            }
        }

        foreach ($args_to_check as $k => $arg) {

<             if (in_array($arg[0], [Type::T_FUNCTION_CALL]) && in_array($arg[1], ['min', 'max'])) {



>             if (in_array($arg[0], [Type::T_FUNCTION_CALL, Type::T_FUNCTION]) && in_array($arg[1], ['min', 'max'])) {


                if (count($kwargs) > 1 || ($k >= 2 && count($args) === 4)) {
                    return null;
                }

                $args[$k] = $this->stringifyFncallArgs($arg);
            }

            if (
                $k >= 2 && count($args) === 4 &&
                in_array($arg[0], [Type::T_FUNCTION_CALL, Type::T_FUNCTION]) &&
                in_array($arg[1], ['calc','env'])
            ) {
                return null;
            }
        }

        $hue = $this->reduce($args[0]);
        $saturation = $this->reduce($args[1]);
        $lightness = $this->reduce($args[2]);
        $alpha = null;

        if (\count($args) === 4) {
            $alpha = $this->compileColorPartValue($args[3], 0, 100, false);

            if (!$hue instanceof Number || !$saturation instanceof Number || ! $lightness instanceof Number || ! is_numeric($alpha)) {
                return [Type::T_STRING, '',
                    [$funcName . '(', $args[0], ', ', $args[1], ', ', $args[2], ', ', $args[3], ')']];
            }
        } else {
            if (!$hue instanceof Number || !$saturation instanceof Number || ! $lightness instanceof Number) {
                return [Type::T_STRING, '', [$funcName . '(', $args[0], ', ', $args[1], ', ', $args[2], ')']];
            }
        }


<         $hueValue = $hue->getDimension() % 360;



>         $hueValue = fmod($hue->getDimension(), 360);



        while ($hueValue < 0) {
            $hueValue += 360;
        }

        $color = $this->toRGB($hueValue, max(0, min($saturation->getDimension(), 100)), max(0, min($lightness->getDimension(), 100)));

        if (! \is_null($alpha)) {
            $color[4] = $alpha;
        }

        return $color;
    }

    protected static $libHsla = [
            ['channels'],

>             ['hue', 'saturation'],


            ['hue', 'saturation', 'lightness'],
            ['hue', 'saturation', 'lightness', 'alpha']];
    protected function libHsla($args, $kwargs)
    {
        return $this->libHsl($args, $kwargs, 'hsla');
    }

    protected static $libHue = ['color'];
    protected function libHue($args)
    {

<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');


        $hsl = $this->toHSL($color[1], $color[2], $color[3]);

        return new Number($hsl[1], 'deg');
    }

    protected static $libSaturation = ['color'];
    protected function libSaturation($args)
    {

<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');


        $hsl = $this->toHSL($color[1], $color[2], $color[3]);

        return new Number($hsl[2], '%');
    }

    protected static $libLightness = ['color'];
    protected function libLightness($args)
    {

<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');


        $hsl = $this->toHSL($color[1], $color[2], $color[3]);

        return new Number($hsl[3], '%');
    }


>     /*
    protected function adjustHsl($color, $idx, $amount)
>      * Todo : a integrer dans le futur module color
    {
>     protected static $libHwb = [
        $hsl = $this->toHSL($color[1], $color[2], $color[3]);
>         ['channels'],
        $hsl[$idx] += $amount;
>         ['hue', 'whiteness', 'blackness'],
        $out = $this->toRGB($hsl[1], $hsl[2], $hsl[3]);
>         ['hue', 'whiteness', 'blackness', 'alpha'] ];

>     protected function libHwb($args, $kwargs, $funcName = 'hwb')
        if (isset($color[4])) {
>     {
            $out[4] = $color[4];
>         $args_to_check = $args;
        }
> 

>         if (\count($args) == 1) {
        return $out;
>             if ($args[0][0] !== Type::T_LIST) {
    }
>                 throw $this->error("Missing elements \$whiteness and \$blackness");

>             }
    protected static $libAdjustHue = ['color', 'degrees'];
> 
    protected function libAdjustHue($args)
>             if (\trim($args[0][1])) {
    {
>                 throw $this->error("\$channels must be a space-separated list.");
        $color = $this->assertColor($args[0]);
>             }
        $degrees = $this->assertNumber($args[1])->getDimension();
> 

>             if (! empty($args[0]['enclosing'])) {
        return $this->adjustHsl($color, 1, $degrees);
>                 throw $this->error("\$channels must be an unbracketed list.");
    }
>             }

> 
    protected static $libLighten = ['color', 'amount'];
>             $args = $args[0][2];
    protected function libLighten($args)
>             if (\count($args) > 3) {
    {
>                 throw $this->error("hwb() : Only 3 elements are allowed but ". \count($args) . "were passed");
        $color = $this->assertColor($args[0]);
>             }
        $amount = Util::checkRange('amount', new Range(0, 100), $args[1], '%');
> 

>             $args_to_check = $this->extractSlashAlphaInColorFunction($kwargs['channels'][2]);
        return $this->adjustHsl($color, 3, $amount);
>             if (\count($args_to_check) !== \count($kwargs['channels'][2])) {
    }
>                 $args = $args_to_check;

>             }
    protected static $libDarken = ['color', 'amount'];
>         }
    protected function libDarken($args)
> 
    {
>         if (\count($args_to_check) < 2) {
        $color = $this->assertColor($args[0]);
>             throw $this->error("Missing elements \$whiteness and \$blackness");
        $amount = Util::checkRange('amount', new Range(0, 100), $args[1], '%');
>         }

>         if (\count($args_to_check) < 3) {
        return $this->adjustHsl($color, 3, -$amount);
>             throw $this->error("Missing element \$blackness");
    }
>         }

>         if (\count($args_to_check) > 4) {
    protected static $libSaturate = [['color', 'amount'], ['amount']];
>             throw $this->error("hwb() : Only 4 elements are allowed but ". \count($args) . "were passed");
    protected function libSaturate($args)
>         }
    {
> 
        $value = $args[0];
>         foreach ($kwargs as $k => $arg) {

>             if (in_array($arg[0], [Type::T_FUNCTION_CALL]) && in_array($arg[1], ['min', 'max'])) {
        if ($value instanceof Number) {
>                 return null;
            return null;
>             }
        }
>         }

> 
        if (count($args) === 1) {
>         foreach ($args_to_check as $k => $arg) {
            $val = $this->compileValue($value);
>             if (in_array($arg[0], [Type::T_FUNCTION_CALL]) && in_array($arg[1], ['min', 'max'])) {
            throw $this->error("\$amount: $val is not a number");
>                 if (count($kwargs) > 1 || ($k >= 2 && count($args) === 4)) {
        }
>                     return null;

>                 }
        $color = $this->assertColor($value);
> 
        $amount = 100 * $this->coercePercent($args[1]);
>                 $args[$k] = $this->stringifyFncallArgs($arg);

>             }
        return $this->adjustHsl($color, 2, $amount);
> 
    }
>             if (

>                 $k >= 2 && count($args) === 4 &&
    protected static $libDesaturate = ['color', 'amount'];
>                 in_array($arg[0], [Type::T_FUNCTION_CALL, Type::T_FUNCTION]) &&
    protected function libDesaturate($args)
>                 in_array($arg[1], ['calc','env'])
    {
>             ) {
        $color = $this->assertColor($args[0]);
>                 return null;
        $amount = 100 * $this->coercePercent($args[1]);
>             }

>         }
        return $this->adjustHsl($color, 2, -$amount);
> 
    }
>         $hue = $this->reduce($args[0]);

>         $whiteness = $this->reduce($args[1]);
    protected static $libGrayscale = ['color'];
>         $blackness = $this->reduce($args[2]);
    protected function libGrayscale($args)
>         $alpha = null;
    {
> 
        $value = $args[0];
>         if (\count($args) === 4) {

>             $alpha = $this->compileColorPartValue($args[3], 0, 1, false);
        if ($value instanceof Number) {
> 
            return null;
>             if (! \is_numeric($alpha)) {
        }
>                 $val = $this->compileValue($args[3]);

>                 throw $this->error("\$alpha: $val is not a number");
        return $this->adjustHsl($this->assertColor($value), 2, -100);
>             }
    }
>         }

> 
    protected static $libComplement = ['color'];
>         $this->assertNumber($hue, 'hue');
    protected function libComplement($args)
>         $this->assertUnit($whiteness, ['%'], 'whiteness');
    {
>         $this->assertUnit($blackness, ['%'], 'blackness');
        return $this->adjustHsl($this->assertColor($args[0]), 1, 180);
> 
    }
>         $this->assertRange($whiteness, 0, 100, "0% and 100%", "whiteness");

>         $this->assertRange($blackness, 0, 100, "0% and 100%", "blackness");
    protected static $libInvert = ['color', 'weight:1'];
> 
    protected function libInvert($args)
>         $w = $whiteness->getDimension();
    {
>         $b = $blackness->getDimension();
        list($value, $weight) = $args;
> 

>         $hueValue = $hue->getDimension() % 360;
        if (! isset($weight)) {
> 
            $weight = 1;
>         while ($hueValue < 0) {
        } else {
>             $hueValue += 360;
            $weight = $this->coercePercent($weight);
>         }
        }
> 

>         $color = $this->HWBtoRGB($hueValue, $w, $b);
        if ($value instanceof Number) {
> 
            return null;
>         if (! \is_null($alpha)) {
        }
>             $color[4] = $alpha;

>         }
        $color = $this->assertColor($value);
> 
        $inverted = $color;
>         return $color;
        $inverted[1] = 255 - $inverted[1];
>     }
        $inverted[2] = 255 - $inverted[2];
> 
        $inverted[3] = 255 - $inverted[3];
>     protected static $libWhiteness = ['color'];

>     protected function libWhiteness($args, $kwargs, $funcName = 'whiteness') {
        if ($weight < 1) {
> 
            return $this->libMix([$inverted, $color, new Number($weight, '')]);
>         $color = $this->assertColor($args[0]);
        }
>         $hwb = $this->RGBtoHWB($color[1], $color[2], $color[3]);

> 
        return $inverted;
>         return new Number($hwb[2], '%');
    }
>     }

> 
    // increases opacity by amount
>     protected static $libBlackness = ['color'];
    protected static $libOpacify = ['color', 'amount'];
>     protected function libBlackness($args, $kwargs, $funcName = 'blackness') {
    protected function libOpacify($args)
> 
    {
>         $color = $this->assertColor($args[0]);
        $color = $this->assertColor($args[0]);
>         $hwb = $this->RGBtoHWB($color[1], $color[2], $color[3]);
        $amount = $this->coercePercent($args[1]);
> 

>         return new Number($hwb[3], '%');
        $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount;
>     }
        $color[4] = min(1, max(0, $color[4]));
>     */

> 
        return $color;
>     /**
    }
>      * @param array     $color

>      * @param int       $idx
    protected static $libFadeIn = ['color', 'amount'];
>      * @param int|float $amount
    protected function libFadeIn($args)
>      *
    {
>      * @return array
        return $this->libOpacify($args);
>      */


    }

> 

>         if ($idx !== 1) {
    // decreases opacity by amount
>             // Clamp the saturation and lightness
    protected static $libTransparentize = ['color', 'amount'];
>             $hsl[$idx] = min(max(0, $hsl[$idx]), 100);
    protected function libTransparentize($args)
>         }
    {
> 



<         $color = $this->assertColor($args[0]);
<         $degrees = $this->assertNumber($args[1])->getDimension();



>         $color = $this->assertColor($args[0], 'color');
>         $degrees = $this->assertNumber($args[1], 'degrees')->getDimension();



<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');



<         $color = $this->assertColor($args[0]);



>         $color = $this->assertColor($args[0], 'color');



<         if ($value instanceof Number) {
<             return null;
<         }
< 



<             $val = $this->compileValue($value);
<             throw $this->error("\$amount: $val is not a number");



>             $this->assertNumber($args[0], 'amount');
> 
>             return null;



<         $color = $this->assertColor($value);
<         $amount = 100 * $this->coercePercent($args[1]);



>         $color = $this->assertColor($args[0], 'color');
>         $amount = $this->assertNumber($args[1], 'amount');



<         return $this->adjustHsl($color, 2, $amount);



>         return $this->adjustHsl($color, 2, $amount->valueInRange(0, 100, 'amount'));



<         $color = $this->assertColor($args[0]);
<         $amount = 100 * $this->coercePercent($args[1]);



>         $color = $this->assertColor($args[0], 'color');
>         $amount = $this->assertNumber($args[1], 'amount');



<         return $this->adjustHsl($color, 2, -$amount);



>         return $this->adjustHsl($color, 2, -$amount->valueInRange(0, 100, 'amount'));



<         return $this->adjustHsl($this->assertColor($value), 2, -100);



>         return $this->adjustHsl($this->assertColor($value, 'color'), 2, -100);



<         return $this->adjustHsl($this->assertColor($args[0]), 1, 180);



>         return $this->adjustHsl($this->assertColor($args[0], 'color'), 1, 180);



<     protected static $libInvert = ['color', 'weight:1'];



>     protected static $libInvert = ['color', 'weight:100%'];



<         list($value, $weight) = $args;



>         $value = $args[0];



<         if (! isset($weight)) {
<             $weight = 1;
<         } else {
<             $weight = $this->coercePercent($weight);
<         }



>         $weight = $this->assertNumber($args[1], 'weight');


    }

>             if ($weight->getDimension() != 100 || !$weight->hasUnit('%')) {

>                 throw new SassScriptException('Only one argument may be passed to the plain-CSS invert() function.');
    protected static $libQuote = ['string'];
>             }
    protected function libQuote($args)
> 



<         $color = $this->assertColor($value);



>         $color = $this->assertColor($value, 'color');



<         if ($weight < 1) {
<             return $this->libMix([$inverted, $color, new Number($weight, '')]);
<         }
< 
<         return $inverted;



>         return $this->libMix([$inverted, $color, $weight]);



<         $color = $this->assertColor($args[0]);
<         $amount = $this->coercePercent($args[1]);



>         $color = $this->assertColor($args[0], 'color');
>         $amount = $this->assertNumber($args[1], 'amount');



<         $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount;



>         $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount->valueInRangeWithUnit(0, 1, 'amount', '');



<         $color = $this->assertColor($args[0]);
<         $amount = $this->coercePercent($args[1]);



>         $color = $this->assertColor($args[0], 'color');
>         $amount = $this->assertNumber($args[1], 'amount');



<         $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount;



>         $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount->valueInRangeWithUnit(0, 1, 'amount', '');



<         $str = $args[0];



>         try {
>             $str = $this->assertString($args[0], 'string');
>         } catch (SassScriptException $e) {
>             $value = $this->compileValue($args[0]);
>             $fname = $this->getPrettyPath($this->sourceNames[$this->sourceIndex]);
>             $line  = $this->sourceLine;



<         if ($str[0] === Type::T_STRING) {
<             $str[1] = '';



>             $message = "Passing $value, a non-string value, to unquote()
> will be an error in future versions of Sass.\n         on line $line of $fname";
> 
>             $this->logger->warn($message, true);
> 
>             return $args[0];


        $num->assertNoUnits('number');

>         $str[1] = '';

> 



<         $value = $args[0];



>         $value = $this->assertString($args[0], 'string');



<         if ($value[0] === Type::T_STRING && ! empty($value[1])) {



<             return $value;
<         }



<         return [Type::T_STRING, '"', [$value]];



>         return $value;


    {
        $num = $this->assertNumber($args[0], 'number');

        return new Number(round($num->getDimension()), $num->getNumeratorUnits(), $num->getDenominatorUnits());
    }

    protected static $libFloor = ['number'];
    protected function libFloor($args)
    {
        $num = $this->assertNumber($args[0], 'number');

        return new Number(floor($num->getDimension()), $num->getNumeratorUnits(), $num->getDenominatorUnits());
    }

    protected static $libCeil = ['number'];
    protected function libCeil($args)
    {
        $num = $this->assertNumber($args[0], 'number');

        return new Number(ceil($num->getDimension()), $num->getNumeratorUnits(), $num->getDenominatorUnits());
    }

    protected static $libAbs = ['number'];
    protected function libAbs($args)
    {
        $num = $this->assertNumber($args[0], 'number');

        return new Number(abs($num->getDimension()), $num->getNumeratorUnits(), $num->getDenominatorUnits());
    }


>     protected static $libMin = ['numbers...'];


    protected function libMin($args)
    {
        /**
         * @var Number|null
         */
        $min = null;


<         foreach ($args as $arg) {



>         foreach ($args[0][2] as $arg) {


            $number = $this->assertNumber($arg);

            if (\is_null($min) || $min->greaterThan($number)) {
                $min = $number;
            }
        }

        if (!\is_null($min)) {
            return $min;
        }

        throw $this->error('At least one argument must be passed.');
    }


>     protected static $libMax = ['numbers...'];


    protected function libMax($args)
    {
        /**
         * @var Number|null
         */
        $max = null;


<         foreach ($args as $arg) {



>         foreach ($args[0][2] as $arg) {


            $number = $this->assertNumber($arg);

            if (\is_null($max) || $max->lessThan($number)) {
                $max = $number;
            }
        }

        if (!\is_null($max)) {
            return $max;
        }

        throw $this->error('At least one argument must be passed.');
    }

    protected static $libLength = ['list'];
    protected function libLength($args)
    {
        $list = $this->coerceList($args[0], ',', true);


<         return \count($list[2]);



>         return new Number(\count($list[2]), '');


    }


<     //protected static $libListSeparator = ['list...'];



>     protected static $libListSeparator = ['list'];


    protected function libListSeparator($args)
    {

<         if (\count($args) > 1) {
<             return 'comma';
<         }
< 


        if (! \in_array($args[0][0], [Type::T_LIST, Type::T_MAP])) {

<             return 'space';



>             return [Type::T_KEYWORD, 'space'];


        }

        $list = $this->coerceList($args[0]);


<         if (\count($list[2]) <= 1 && empty($list['enclosing'])) {
<             return 'space';



>         if ($list[1] === '' && \count($list[2]) <= 1 && empty($list['enclosing'])) {
>             return [Type::T_KEYWORD, 'space'];


        }

        if ($list[1] === ',') {

<             return 'comma';



>             return [Type::T_KEYWORD, 'comma'];
>         }
> 
>         if ($list[1] === '/') {
>             return [Type::T_KEYWORD, 'slash'];


        }


<         return 'space';



>         return [Type::T_KEYWORD, 'space'];


    }

    protected static $libNth = ['list', 'n'];
    protected function libNth($args)
    {
        $list = $this->coerceList($args[0], ',', false);

<         $n = $this->assertNumber($args[1])->getDimension();



>         $n = $this->assertInteger($args[1]);



        if ($n > 0) {
            $n--;
        } elseif ($n < 0) {
            $n += \count($list[2]);
        }

        return isset($list[2][$n]) ? $list[2][$n] : static::$defaultValue;
    }

    protected static $libSetNth = ['list', 'n', 'value'];
    protected function libSetNth($args)
    {
        $list = $this->coerceList($args[0]);

<         $n = $this->assertNumber($args[1])->getDimension();



>         $n = $this->assertInteger($args[1]);



        if ($n > 0) {
            $n--;
        } elseif ($n < 0) {
            $n += \count($list[2]);
        }

        if (! isset($list[2][$n])) {
            throw $this->error('Invalid argument for "n"');
        }

        $list[2][$n] = $args[2];

        return $list;
    }


<     protected static $libMapGet = ['map', 'key'];



>     protected static $libMapGet = ['map', 'key', 'keys...'];


    protected function libMapGet($args)
    {

<         $map = $this->assertMap($args[0]);
<         $key = $args[1];



>         $map = $this->assertMap($args[0], 'map');
>         if (!isset($args[2])) {
>             // BC layer for usages of the function from PHP code rather than from the Sass function
>             $args[2] = self::$emptyArgumentList;
>         }
>         $keys = array_merge([$args[1]], $args[2][2]);
>         $value = static::$null;
> 
>         foreach ($keys as $key) {
>             if (!\is_array($map) || $map[0] !== Type::T_MAP) {
>                 return static::$null;
>             }
> 
>             $map = $this->mapGet($map, $key);
> 
>             if ($map === null) {
>                 return static::$null;
>             }
> 
>             $value = $map;
>         }
> 
>         return $value;
>     }
> 
>     /**
>      * Gets the value corresponding to that key in the map
>      *
>      * @param array        $map
>      * @param Number|array $key
>      *
>      * @return Number|array|null
>      */
>     private function mapGet(array $map, $key)
>     {
>         $index = $this->mapGetEntryIndex($map, $key);




<         if (! \is_null($key)) {



>         if ($index !== null) {
>             return $map[2][$index];
>         }
> 
>         return null;
>     }
> 
>     /**
>      * Gets the index corresponding to that key in the map entries
>      *
>      * @param array        $map
>      * @param Number|array $key
>      *
>      * @return int|null
>      */
>     private function mapGetEntryIndex(array $map, $key)
>     {


            $key = $this->compileStringContent($this->coerceString($key));

            for ($i = \count($map[1]) - 1; $i >= 0; $i--) {
                if ($key === $this->compileStringContent($this->coerceString($map[1][$i]))) {

<                     return $map[2][$i];
<                 }



>                 return $i;


            }
        }


<         return static::$null;



>         return null;


    }

    protected static $libMapKeys = ['map'];
    protected function libMapKeys($args)
    {

<         $map = $this->assertMap($args[0]);



>         $map = $this->assertMap($args[0], 'map');


        $keys = $map[1];

        return [Type::T_LIST, ',', $keys];
    }

    protected static $libMapValues = ['map'];
    protected function libMapValues($args)
    {

<         $map = $this->assertMap($args[0]);



>         $map = $this->assertMap($args[0], 'map');


        $values = $map[2];

        return [Type::T_LIST, ',', $values];
    }


<     protected static $libMapRemove = ['map', 'key...'];



>     protected static $libMapRemove = [
>         ['map'],
>         ['map', 'key', 'keys...'],
>     ];


    protected function libMapRemove($args)
    {

<         $map = $this->assertMap($args[0]);
<         $keyList = $this->assertList($args[1]);



>         $map = $this->assertMap($args[0], 'map');
> 
>         if (\count($args) === 1) {
>             return $map;
>         }



        $keys = [];

>         $keys[] = $this->compileStringContent($this->coerceString($args[1]));




<         foreach ($keyList[2] as $key) {



>         foreach ($args[2][2] as $key) {


            $keys[] = $this->compileStringContent($this->coerceString($key));
        }

        for ($i = \count($map[1]) - 1; $i >= 0; $i--) {
            if (in_array($this->compileStringContent($this->coerceString($map[1][$i])), $keys)) {
                array_splice($map[1], $i, 1);
                array_splice($map[2], $i, 1);
            }
        }

        return $map;
    }


<     protected static $libMapHasKey = ['map', 'key'];



>     protected static $libMapHasKey = ['map', 'key', 'keys...'];


    protected function libMapHasKey($args)
    {

<         $map = $this->assertMap($args[0]);
<         $key = $this->compileStringContent($this->coerceString($args[1]));



>         $map = $this->assertMap($args[0], 'map');
>         if (!isset($args[2])) {
>             // BC layer for usages of the function from PHP code rather than from the Sass function
>             $args[2] = self::$emptyArgumentList;
>         }
>         $keys = array_merge([$args[1]], $args[2][2]);
>         $lastKey = array_pop($keys);
> 
>         foreach ($keys as $key) {
>             $value = $this->mapGet($map, $key);
> 
>             if ($value === null || $value instanceof Number || $value[0] !== Type::T_MAP) {
>                 return self::$false;
>             }
> 
>             $map = $value;
>         }
> 
>         return $this->toBool($this->mapHasKey($map, $lastKey));
>     }
> 
>     /**
>      * @param array|Number $keyValue
>      *
>      * @return bool
>      */
>     private function mapHasKey(array $map, $keyValue)
>     {
>         $key = $this->compileStringContent($this->coerceString($keyValue));



        for ($i = \count($map[1]) - 1; $i >= 0; $i--) {
            if ($key === $this->compileStringContent($this->coerceString($map[1][$i]))) {
                return true;
            }
        }

        return false;
    }

    protected static $libMapMerge = [
        ['map1', 'map2'],

<         ['map-1', 'map-2']



>         ['map-1', 'map-2'],
>         ['map1', 'args...']


    ];
    protected function libMapMerge($args)
    {

<         $map1 = $this->assertMap($args[0]);
<         $map2 = $this->assertMap($args[1]);



>         $map1 = $this->assertMap($args[0], 'map1');
>         $map2 = $args[1];
>         $keys = [];
>         if ($map2[0] === Type::T_LIST && isset($map2[3]) && \is_array($map2[3])) {
>             // This is an argument list for the variadic signature
>             if (\count($map2[2]) === 0) {
>                 throw new SassScriptException('Expected $args to contain a key.');
>             }
>             if (\count($map2[2]) === 1) {
>                 throw new SassScriptException('Expected $args to contain a value.');
>             }
>             $keys = $map2[2];
>             $map2 = array_pop($keys);
>         }
>         $map2 = $this->assertMap($map2, 'map2');




<         foreach ($map2[1] as $i2 => $key2) {
<             $key = $this->compileStringContent($this->coerceString($key2));



>         return $this->modifyMap($map1, $keys, function ($oldValue) use ($map2) {
>             $nestedMap = $this->tryMap($oldValue);




<             foreach ($map1[1] as $i1 => $key1) {
<                 if ($key === $this->compileStringContent($this->coerceString($key1))) {
<                     $map1[2][$i1] = $map2[2][$i2];
<                     continue 2;



>             if ($nestedMap === null) {
>                 return $map2;
>             }
> 
>             return $this->mergeMaps($nestedMap, $map2);
>         });
>     }
> 
>     /**
>      * @param array    $map
>      * @param array    $keys
>      * @param callable $modify
>      * @param bool     $addNesting
>      *
>      * @return Number|array
>      *
>      * @phpstan-param array<Number|array> $keys
>      * @phpstan-param callable(Number|array): (Number|array) $modify
>      */
>     private function modifyMap(array $map, array $keys, callable $modify, $addNesting = true)
>     {
>         if ($keys === []) {
>             return $modify($map);
>         }
> 
>         return $this->modifyNestedMap($map, $keys, $modify, $addNesting);
>     }
> 
>     /**
>      * @param array    $map
>      * @param array    $keys
>      * @param callable $modify
>      * @param bool     $addNesting
>      *
>      * @return array
>      *
>      * @phpstan-param non-empty-array<Number|array> $keys
>      * @phpstan-param callable(Number|array): (Number|array) $modify
>      */
>     private function modifyNestedMap(array $map, array $keys, callable $modify, $addNesting)
>     {
>         $key = array_shift($keys);
> 
>         $nestedValueIndex = $this->mapGetEntryIndex($map, $key);
> 
>         if ($keys === []) {
>             if ($nestedValueIndex !== null) {
>                 $map[2][$nestedValueIndex] = $modify($map[2][$nestedValueIndex]);
>             } else {
>                 $map[1][] = $key;
>                 $map[2][] = $modify(self::$null);
>             }
> 
>             return $map;
>         }
> 
>         $nestedMap = $nestedValueIndex !== null ? $this->tryMap($map[2][$nestedValueIndex]) : null;
> 
>         if ($nestedMap === null && !$addNesting) {
>             return $map;
>         }
> 
>         if ($nestedMap === null) {
>             $nestedMap = self::$emptyMap;
>         }
> 
>         $newNestedMap = $this->modifyNestedMap($nestedMap, $keys, $modify, $addNesting);
> 
>         if ($nestedValueIndex !== null) {
>             $map[2][$nestedValueIndex] = $newNestedMap;
>         } else {
>             $map[1][] = $key;
>             $map[2][] = $newNestedMap;
>         }
> 
>         return $map;


                }

> 
            }
>     /**

>      * Merges 2 Sass maps together
            $map1[1][] = $map2[1][$i2];
>      *
            $map1[2][] = $map2[2][$i2];
>      * @param array $map1
        }
>      * @param array $map2

>      *
        return $map1;
>      * @return array
    }
>      */

>     private function mergeMaps(array $map1, array $map2)
    protected static $libKeywords = ['args'];
>     {
    protected function libKeywords($args)
>         foreach ($map2[1] as $i2 => $key2) {
    {
>             $map1EntryIndex = $this->mapGetEntryIndex($map1, $key2);
        $this->assertList($args[0]);
> 

>             if ($map1EntryIndex !== null) {
        $keys = [];
>                 $map1[2][$map1EntryIndex] = $map2[2][$i2];
        $values = [];
>                 continue;



<             $map1[1][] = $map2[1][$i2];



>             $map1[1][] = $key2;



<         $this->assertList($args[0]);



>         $value = $args[0];
> 
>         if ($value[0] !== Type::T_LIST || !isset($value[3]) || !\is_array($value[3])) {
>             $compiledValue = $this->compileValue($value);
> 
>             throw SassScriptException::forArgument($compiledValue . ' is not an argument list.', 'args');
>         }



<         foreach ($args[0][2] as $name => $arg) {



>         foreach ($this->getArgumentListKeywords($value) as $name => $arg) {


            $values[] = $arg;
        }

        return [Type::T_MAP, $keys, $values];
    }

    protected static $libIsBracketed = ['list'];
    protected function libIsBracketed($args)
    {
        $list = $args[0];
        $this->coerceList($list, ' ');

        if (! empty($list['enclosing']) && $list['enclosing'] === 'bracket') {

<             return true;



>             return self::$true;


        }


<         return false;



>         return self::$false;


    }

    /**
     * @param array $list1
     * @param array|Number|null $sep
     *
     * @return string
     * @throws CompilerException

>      *
     */
>      * @deprecated


    protected function listSeparatorForJoin($list1, $sep)
    {

>         @trigger_error(sprintf('The "%s" method is deprecated.', __METHOD__), E_USER_DEPRECATED);
        if (! isset($sep)) {
> 


            return $list1[1];
        }

        switch ($this->compileValue($sep)) {
            case 'comma':
                return ',';

            case 'space':
                return ' ';

            default:
                return $list1[1];
        }
    }


<     protected static $libJoin = ['list1', 'list2', 'separator:null', 'bracketed:auto'];



>     protected static $libJoin = ['list1', 'list2', 'separator:auto', 'bracketed:auto'];


    protected function libJoin($args)
    {
        list($list1, $list2, $sep, $bracketed) = $args;

        $list1 = $this->coerceList($list1, ' ', true);
        $list2 = $this->coerceList($list2, ' ', true);

<         $sep   = $this->listSeparatorForJoin($list1, $sep);



> 
>         switch ($this->compileStringContent($this->assertString($sep, 'separator'))) {
>             case 'comma':
>                 $separator = ',';
>                 break;
> 
>             case 'space':
>                 $separator = ' ';
>                 break;
> 
>             case 'slash':
>                 $separator = '/';
>                 break;
> 
>             case 'auto':
>                 if ($list1[1] !== '' || count($list1[2]) > 1 || !empty($list1['enclosing']) && $list1['enclosing'] !== 'parent') {
>                     $separator = $list1[1] ?: ' ';
>                 } elseif ($list2[1] !== '' || count($list2[2]) > 1 || !empty($list2['enclosing']) && $list2['enclosing'] !== 'parent') {
>                     $separator = $list2[1] ?: ' ';
>                 } else {
>                     $separator = ' ';
>                 }
>                 break;
> 
>             default:
>                 throw SassScriptException::forArgument('Must be "space", "comma", "slash", or "auto".', 'separator');
>         }



        if ($bracketed === static::$true) {
            $bracketed = true;
        } elseif ($bracketed === static::$false) {
            $bracketed = false;
        } elseif ($bracketed === [Type::T_KEYWORD, 'auto']) {
            $bracketed = 'auto';
        } elseif ($bracketed === static::$null) {
            $bracketed = false;
        } else {
            $bracketed = $this->compileValue($bracketed);
            $bracketed = ! ! $bracketed;

            if ($bracketed === true) {
                $bracketed = true;
            }
        }

        if ($bracketed === 'auto') {
            $bracketed = false;

            if (! empty($list1['enclosing']) && $list1['enclosing'] === 'bracket') {
                $bracketed = true;
            }
        }


<         $res = [Type::T_LIST, $sep, array_merge($list1[2], $list2[2])];
< 
<         if (isset($list1['enclosing'])) {
<             $res['enlcosing'] = $list1['enclosing'];
<         }



>         $res = [Type::T_LIST, $separator, array_merge($list1[2], $list2[2])];



        if ($bracketed) {
            $res['enclosing'] = 'bracket';
        }

        return $res;
    }


<     protected static $libAppend = ['list', 'val', 'separator:null'];



>     protected static $libAppend = ['list', 'val', 'separator:auto'];


    protected function libAppend($args)
    {
        list($list1, $value, $sep) = $args;

        $list1 = $this->coerceList($list1, ' ', true);

<         $sep   = $this->listSeparatorForJoin($list1, $sep);
<         $res   = [Type::T_LIST, $sep, array_merge($list1[2], [$value])];



> 
>         switch ($this->compileStringContent($this->assertString($sep, 'separator'))) {
>             case 'comma':
>                 $separator = ',';
>                 break;
> 
>             case 'space':
>                 $separator = ' ';
>                 break;
> 
>             case 'slash':
>                 $separator = '/';
>                 break;
> 
>             case 'auto':
>                 $separator = $list1[1] === '' && \count($list1[2]) <= 1 && (empty($list1['enclosing']) || $list1['enclosing'] === 'parent') ? ' ' : $list1[1];
>                 break;
> 
>             default:
>                 throw SassScriptException::forArgument('Must be "space", "comma", "slash", or "auto".', 'separator');
>         }
> 
>         $res = [Type::T_LIST, $separator, array_merge($list1[2], [$value])];



        if (isset($list1['enclosing'])) {
            $res['enclosing'] = $list1['enclosing'];
        }

        return $res;
    }


>     protected static $libZip = ['lists...'];


    protected function libZip($args)
    {

<         foreach ($args as $key => $arg) {
<             $args[$key] = $this->coerceList($arg);



>         $argLists = [];
>         foreach ($args[0][2] as $arg) {
>             $argLists[] = $this->coerceList($arg);


        }

        $lists = [];

<         $firstList = array_shift($args);



>         $firstList = array_shift($argLists);



        $result = [Type::T_LIST, ',', $lists];
        if (! \is_null($firstList)) {
            foreach ($firstList[2] as $key => $item) {
                $list = [Type::T_LIST, '', [$item]];


<                 foreach ($args as $arg) {



>                 foreach ($argLists as $arg) {


                    if (isset($arg[2][$key])) {
                        $list[2][] = $arg[2][$key];
                    } else {
                        break 2;
                    }
                }

                $lists[] = $list;
            }

            $result[2] = $lists;
        } else {
            $result['enclosing'] = 'parent';
        }

        return $result;
    }

    protected static $libTypeOf = ['value'];
    protected function libTypeOf($args)
    {
        $value = $args[0];


>         return [Type::T_KEYWORD, $this->getTypeOf($value)];
        switch ($value[0]) {
>     }
            case Type::T_KEYWORD:
> 
                if ($value === static::$true || $value === static::$false) {
>     /**
                    return 'bool';
>      * @param array|Number $value
                }
>      *

>      * @return string
                if ($this->coerceColor($value)) {
>      */
                    return 'color';
>     private function getTypeOf($value)
                }
>     {



                // fall-thru
            case Type::T_FUNCTION:
                return 'string';

            case Type::T_FUNCTION_REFERENCE:
                return 'function';

            case Type::T_LIST:

<                 if (isset($value[3]) && $value[3]) {



>                 if (isset($value[3]) && \is_array($value[3])) {


                    return 'arglist';
                }

                // fall-thru
            default:
                return $value[0];
        }
    }

    protected static $libUnit = ['number'];
    protected function libUnit($args)
    {

<         $num = $args[0];



>         $num = $this->assertNumber($args[0], 'number');




<         if ($num instanceof Number) {


            return [Type::T_STRING, '"', [$num->unitStr()]];
        }


<         return '';
<     }
< 


    protected static $libUnitless = ['number'];
    protected function libUnitless($args)
    {

<         $value = $args[0];



>         $value = $this->assertNumber($args[0], 'number');




<         return $value instanceof Number && $value->unitless();



>         return $this->toBool($value->unitless());


    }

    protected static $libComparable = [
        ['number1', 'number2'],
        ['number-1', 'number-2']
    ];
    protected function libComparable($args)
    {
        list($number1, $number2) = $args;

        if (
            ! $number1 instanceof Number ||
            ! $number2 instanceof Number
        ) {
            throw $this->error('Invalid argument(s) for "comparable"');
        }


<         return $number1->isComparableTo($number2);



>         return $this->toBool($number1->isComparableTo($number2));


    }

    protected static $libStrIndex = ['string', 'substring'];
    protected function libStrIndex($args)
    {
        $string = $this->assertString($args[0], 'string');
        $stringContent = $this->compileStringContent($string);

        $substring = $this->assertString($args[1], 'substring');
        $substringContent = $this->compileStringContent($substring);

        if (! \strlen($substringContent)) {
            $result = 0;
        } else {
            $result = Util::mbStrpos($stringContent, $substringContent);
        }

        return $result === false ? static::$null : new Number($result + 1, '');
    }

    protected static $libStrInsert = ['string', 'insert', 'index'];
    protected function libStrInsert($args)
    {
        $string = $this->assertString($args[0], 'string');
        $stringContent = $this->compileStringContent($string);

        $insert = $this->assertString($args[1], 'insert');
        $insertContent = $this->compileStringContent($insert);

        $index = $this->assertInteger($args[2], 'index');
        if ($index > 0) {
            $index = $index - 1;
        }
        if ($index < 0) {

<             $index = Util::mbStrlen($stringContent) + 1 + $index;



>             $index = max(Util::mbStrlen($stringContent) + 1 + $index, 0);


        }

        $string[2] = [
            Util::mbSubstr($stringContent, 0, $index),
            $insertContent,
            Util::mbSubstr($stringContent, $index)
        ];

        return $string;
    }

    protected static $libStrLength = ['string'];
    protected function libStrLength($args)
    {
        $string = $this->assertString($args[0], 'string');
        $stringContent = $this->compileStringContent($string);

        return new Number(Util::mbStrlen($stringContent), '');
    }

    protected static $libStrSlice = ['string', 'start-at', 'end-at:-1'];
    protected function libStrSlice($args)
    {

<         if (isset($args[2]) && ! $args[2][1]) {
<             return static::$nullString;



>         $string = $this->assertString($args[0], 'string');
>         $stringContent = $this->compileStringContent($string);
> 
>         $start = $this->assertNumber($args[1], 'start-at');
>         $start->assertNoUnits('start-at');
>         $startInt = $this->assertInteger($start, 'start-at');
>         $end = $this->assertNumber($args[2], 'end-at');
>         $end->assertNoUnits('end-at');
>         $endInt = $this->assertInteger($end, 'end-at');
> 
>         if ($endInt === 0) {
>             return [Type::T_STRING, $string[1], []];


        }


<         $string = $this->coerceString($args[0]);
<         $stringContent = $this->compileStringContent($string);



>         if ($startInt > 0) {
>             $startInt--;
>         }




<         $start = (int) $args[1][1];



>         if ($endInt < 0) {
>             $endInt = Util::mbStrlen($stringContent) + $endInt;
>         } else {
>             $endInt--;
>         }




<         if ($start > 0) {
<             $start--;



>         if ($endInt < $startInt) {
>             return [Type::T_STRING, $string[1], []];


        }


<         $end    = isset($args[2]) ? (int) $args[2][1] : -1;
<         $length = $end < 0 ? $end + 1 : ($end > 0 ? $end - $start : $end);



>         $length = $endInt - $startInt + 1; // The end of the slice is inclusive




<         $string[2] = $length
<             ? [substr($stringContent, $start, $length)]
<             : [substr($stringContent, $start)];



>         $string[2] = [Util::mbSubstr($stringContent, $startInt, $length)];



        return $string;
    }

    protected static $libToLowerCase = ['string'];
    protected function libToLowerCase($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'string');


        $stringContent = $this->compileStringContent($string);

        $string[2] = [$this->stringTransformAsciiOnly($stringContent, 'strtolower')];

        return $string;
    }

    protected static $libToUpperCase = ['string'];
    protected function libToUpperCase($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'string');


        $stringContent = $this->compileStringContent($string);

        $string[2] = [$this->stringTransformAsciiOnly($stringContent, 'strtoupper')];

        return $string;
    }

    /**
     * Apply a filter on a string content, only on ascii chars
     * let extended chars untouched
     *
     * @param string $stringContent
     * @param callable $filter
     * @return string
     */
    protected function stringTransformAsciiOnly($stringContent, $filter)
    {
        $mblength = Util::mbStrlen($stringContent);
        if ($mblength === strlen($stringContent)) {
            return $filter($stringContent);
        }
        $filteredString = "";
        for ($i = 0; $i < $mblength; $i++) {
            $char = Util::mbSubstr($stringContent, $i, 1);
            if (strlen($char) > 1) {
                $filteredString .= $char;
            } else {
                $filteredString .= $filter($char);
            }
        }

        return $filteredString;
    }

    protected static $libFeatureExists = ['feature'];
    protected function libFeatureExists($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'feature');


        $name = $this->compileStringContent($string);

        return $this->toBool(
            \array_key_exists($name, $this->registeredFeatures) ? $this->registeredFeatures[$name] : false
        );
    }

    protected static $libFunctionExists = ['name'];
    protected function libFunctionExists($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'name');


        $name = $this->compileStringContent($string);

        // user defined functions
        if ($this->has(static::$namespaces['function'] . $name)) {

<             return true;



>             return self::$true;


        }

        $name = $this->normalizeName($name);

        if (isset($this->userFunctions[$name])) {

<             return true;



>             return self::$true;


        }

        // built-in functions
        $f = $this->getBuiltinFunction($name);

        return $this->toBool(\is_callable($f));
    }

    protected static $libGlobalVariableExists = ['name'];
    protected function libGlobalVariableExists($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'name');


        $name = $this->compileStringContent($string);


<         return $this->has($name, $this->rootEnv);



>         return $this->toBool($this->has($name, $this->rootEnv));


    }

    protected static $libMixinExists = ['name'];
    protected function libMixinExists($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'name');


        $name = $this->compileStringContent($string);


<         return $this->has(static::$namespaces['mixin'] . $name);



>         return $this->toBool($this->has(static::$namespaces['mixin'] . $name));


    }

    protected static $libVariableExists = ['name'];
    protected function libVariableExists($args)
    {

<         $string = $this->coerceString($args[0]);



>         $string = $this->assertString($args[0], 'name');


        $name = $this->compileStringContent($string);


<         return $this->has($name);



>         return $this->toBool($this->has($name));


    }


>     protected static $libCounter = ['args...'];


    /**
     * Workaround IE7's content counter bug.
     *
     * @param array $args
     *
     * @return array
     */
    protected function libCounter($args)
    {

<         $list = array_map([$this, 'compileValue'], $args);



>         $list = array_map([$this, 'compileValue'], $args[0][2]);



        return [Type::T_STRING, '', ['counter(' . implode(',', $list) . ')']];
    }

    protected static $libRandom = ['limit:null'];
    protected function libRandom($args)
    {

<         if (isset($args[0]) & $args[0] !== static::$null) {
<             $n = $this->assertNumber($args[0])->getDimension();



>         if (isset($args[0]) && $args[0] !== static::$null) {
>             $limit = $this->assertNumber($args[0], 'limit');




<             if ($n < 1) {
<                 throw $this->error("\$limit must be greater than or equal to 1");



>             if ($limit->hasUnits()) {
>                 $unitString = $limit->unitStr();
>                 $message = <<<TXT
> random() will no longer ignore \$limit units ($limit) in a future release.
> 
> Recommendation: random(\$limit / 1$unitString) * 1$unitString
> 
> To preserve current behavior: random(\$limit / 1$unitString)
> 
> More info: https://sass-lang.com/d/random-with-units
> 
> TXT;
> 
>                 Warn::deprecation($this->addLocationToMessage($message));


            }


<             if (round($n - \intval($n), Number::PRECISION) > 0) {
<                 throw $this->error("Expected \$limit to be an integer but got $n for `random`");



>             $n = $this->assertInteger($limit, 'limit');
> 
>             if ($n < 1) {
>                 throw new SassScriptException("\$limit: Must be greater than 0, was $n.");


            }


<             return new Number(mt_rand(1, \intval($n)), '');



>             return new Number(mt_rand(1, $n), '');


        }

        $max = mt_getrandmax();
        return new Number(mt_rand(0, $max - 1) / $max, '');
    }


>     protected static $libUniqueId = [];


    protected function libUniqueId()
    {
        static $id;

        if (! isset($id)) {
            $id = PHP_INT_SIZE === 4
                ? mt_rand(0, pow(36, 5)) . str_pad(mt_rand(0, pow(36, 5)) % 10000000, 7, '0', STR_PAD_LEFT)
                : mt_rand(0, pow(36, 8));
        }

        $id += mt_rand(0, 10) + 1;

        return [Type::T_STRING, '', ['u' . str_pad(base_convert($id, 10, 36), 8, '0', STR_PAD_LEFT)]];
    }


>     /**
    protected function inspectFormatValue($value, $force_enclosing_display = false)
>      * @param array|Number $value
    {
>      * @param bool         $force_enclosing_display
        if ($value === static::$null) {
>      *
            $value = [Type::T_KEYWORD, 'null'];
>      * @return array
        }
>      */



        $stringValue = [$value];


>         if ($value instanceof Number) {
        if ($value[0] === Type::T_LIST) {
>             return [Type::T_STRING, '', $stringValue];
            if (end($value[2]) === static::$null) {
>         }
                array_pop($value[2]);
> 


                $value[2][] = [Type::T_STRING, '', ['']];
                $force_enclosing_display = true;
            }

            if (
                ! empty($value['enclosing']) &&
                ($force_enclosing_display ||
                    ($value['enclosing'] === 'bracket') ||
                    ! \count($value[2]))
            ) {
                $value['enclosing'] = 'forced_' . $value['enclosing'];
                $force_enclosing_display = true;

>             } elseif (! \count($value[2])) {
            }
>                 $value['enclosing'] = 'forced_parent';



            foreach ($value[2] as $k => $listelement) {
                $value[2][$k] = $this->inspectFormatValue($listelement, $force_enclosing_display);
            }

            $stringValue = [$value];
        }

        return [Type::T_STRING, '', $stringValue];
    }

    protected static $libInspect = ['value'];
    protected function libInspect($args)
    {
        $value = $args[0];

        return $this->inspectFormatValue($value);
    }

    /**
     * Preprocess selector args
     *
     * @param array $arg

>      * @param string|null $varname
     *
>      * @param bool        $allowParent



<      * @return array|boolean



>      * @return array


     */
    protected function getSelectorArg($arg, $varname = null, $allowParent = false)
    {
        static $parser = null;

        if (\is_null($parser)) {
            $parser = $this->parserFactory(__METHOD__);
        }

        if (! $this->checkSelectorArgType($arg)) {

<             $var_display = ($varname ? ' $' . $varname . ':' : '');


            $var_value = $this->compileValue($arg);

<             throw $this->error("Error:{$var_display} $var_value is not a valid selector: it must be a string,"
<                 . " a list of strings, or a list of lists of strings");



>             throw SassScriptException::forArgument("$var_value is not a valid selector: it must be a string, a list of strings, or a list of lists of strings", $varname);


        }


<         $arg = $this->libUnquote([$arg]);



> 
>         if ($arg[0] === Type::T_STRING) {
>             $arg[1] = '';
>         }


        $arg = $this->compileValue($arg);

        $parsedSelector = [];

        if ($parser->parseSelector($arg, $parsedSelector, true)) {
            $selector = $this->evalSelectors($parsedSelector);
            $gluedSelector = $this->glueFunctionSelectors($selector);

            if (! $allowParent) {
                foreach ($gluedSelector as $selector) {
                    foreach ($selector as $s) {
                        if (in_array(static::$selfSelector, $s)) {

<                             $var_display = ($varname ? ' $' . $varname . ':' : '');
<                             throw $this->error("Error:{$var_display} Parent selectors aren't allowed here.");



>                             throw SassScriptException::forArgument("Parent selectors aren't allowed here.", $varname);


                        }
                    }
                }
            }

            return $gluedSelector;
        }


<         $var_display = ($varname ? ' $' . $varname . ':' : '');
<         throw $this->error("Error:{$var_display} expected more input, invalid selector.");



>         throw SassScriptException::forArgument("expected more input, invalid selector.", $varname);


    }

    /**
     * Check variable type for getSelectorArg() function
     * @param array $arg
     * @param int $maxDepth
     * @return bool
     */
    protected function checkSelectorArgType($arg, $maxDepth = 2)
    {
        if ($arg[0] === Type::T_LIST && $maxDepth > 0) {
            foreach ($arg[2] as $elt) {
                if (! $this->checkSelectorArgType($elt, $maxDepth - 1)) {
                    return false;
                }
            }
            return true;
        }
        if (!in_array($arg[0], [Type::T_STRING, Type::T_KEYWORD])) {
            return false;
        }
        return true;
    }

    /**
     * Postprocess selector to output in right format
     *
     * @param array $selectors
     *

<      * @return string



>      * @return array


     */
    protected function formatOutputSelector($selectors)
    {

<         $selectors = $this->collapseSelectors($selectors, true);



>         $selectors = $this->collapseSelectorsAsList($selectors);



        return $selectors;
    }

    protected static $libIsSuperselector = ['super', 'sub'];
    protected function libIsSuperselector($args)
    {
        list($super, $sub) = $args;

        $super = $this->getSelectorArg($super, 'super');
        $sub = $this->getSelectorArg($sub, 'sub');


<         return $this->isSuperSelector($super, $sub);



>         return $this->toBool($this->isSuperSelector($super, $sub));


    }

    /**
     * Test a $super selector again $sub
     *
     * @param array $super
     * @param array $sub
     *

<      * @return boolean



>      * @return bool


     */
    protected function isSuperSelector($super, $sub)
    {
        // one and only one selector for each arg
        if (! $super) {
            throw $this->error('Invalid super selector for isSuperSelector()');
        }

        if (! $sub) {
            throw $this->error('Invalid sub selector for isSuperSelector()');
        }

        if (count($sub) > 1) {
            foreach ($sub as $s) {
                if (! $this->isSuperSelector($super, [$s])) {
                    return false;
                }
            }
            return true;
        }

        if (count($super) > 1) {
            foreach ($super as $s) {
                if ($this->isSuperSelector([$s], $sub)) {
                    return true;
                }
            }
            return false;
        }

        $super = reset($super);
        $sub = reset($sub);

        $i = 0;
        $nextMustMatch = false;

        foreach ($super as $node) {
            $compound = '';

            array_walk_recursive(
                $node,
                function ($value, $key) use (&$compound) {
                    $compound .= $value;
                }
            );

            if ($this->isImmediateRelationshipCombinator($compound)) {
                if ($node !== $sub[$i]) {
                    return false;
                }

                $nextMustMatch = true;
                $i++;
            } else {
                while ($i < \count($sub) && ! $this->isSuperPart($node, $sub[$i])) {
                    if ($nextMustMatch) {
                        return false;
                    }

                    $i++;
                }

                if ($i >= \count($sub)) {
                    return false;
                }

                $nextMustMatch = false;
                $i++;
            }
        }

        return true;
    }

    /**
     * Test a part of super selector again a part of sub selector
     *
     * @param array $superParts
     * @param array $subParts
     *

<      * @return boolean



>      * @return bool


     */
    protected function isSuperPart($superParts, $subParts)
    {
        $i = 0;

        foreach ($superParts as $superPart) {
            while ($i < \count($subParts) && $subParts[$i] !== $superPart) {
                $i++;
            }

            if ($i >= \count($subParts)) {
                return false;
            }

            $i++;
        }

        return true;
    }

    protected static $libSelectorAppend = ['selector...'];
    protected function libSelectorAppend($args)
    {
        // get the selector... list
        $args = reset($args);
        $args = $args[2];

        if (\count($args) < 1) {
            throw $this->error('selector-append() needs at least 1 argument');
        }

        $selectors = [];
        foreach ($args as $arg) {
            $selectors[] = $this->getSelectorArg($arg, 'selector');
        }

        return $this->formatOutputSelector($this->selectorAppend($selectors));
    }

    /**
     * Append parts of the last selector in the list to the previous, recursively
     *
     * @param array $selectors
     *
     * @return array
     *
     * @throws \ScssPhp\ScssPhp\Exception\CompilerException
     */
    protected function selectorAppend($selectors)
    {
        $lastSelectors = array_pop($selectors);

        if (! $lastSelectors) {
            throw $this->error('Invalid selector list in selector-append()');
        }

        while (\count($selectors)) {
            $previousSelectors = array_pop($selectors);

            if (! $previousSelectors) {
                throw $this->error('Invalid selector list in selector-append()');
            }

            // do the trick, happening $lastSelector to $previousSelector
            $appended = [];


>             foreach ($previousSelectors as $previousSelector) {


            foreach ($lastSelectors as $lastSelector) {

<                 $previous = $previousSelectors;
< 



>                     $previous = $previousSelector;
>                     foreach ($previousSelector as $j => $previousSelectorParts) {


                foreach ($lastSelector as $lastSelectorParts) {
                    foreach ($lastSelectorParts as $lastSelectorPart) {

<                         foreach ($previous as $i => $previousSelector) {
<                             foreach ($previousSelector as $j => $previousSelectorParts) {
<                                 $previous[$i][$j][] = $lastSelectorPart;
<                             }



>                                 $previous[$j][] = $lastSelectorPart;


                        }
                    }
                }


<                 foreach ($previous as $ps) {
<                     $appended[] = $ps;



>                     $appended[] = $previous;


                }
            }

            $lastSelectors = $appended;
        }

        return $lastSelectors;
    }

    protected static $libSelectorExtend = [
        ['selector', 'extendee', 'extender'],
        ['selectors', 'extendee', 'extender']
    ];
    protected function libSelectorExtend($args)
    {
        list($selectors, $extendee, $extender) = $args;

        $selectors = $this->getSelectorArg($selectors, 'selector');
        $extendee  = $this->getSelectorArg($extendee, 'extendee');
        $extender  = $this->getSelectorArg($extender, 'extender');

        if (! $selectors || ! $extendee || ! $extender) {
            throw $this->error('selector-extend() invalid arguments');
        }

        $extended = $this->extendOrReplaceSelectors($selectors, $extendee, $extender);

        return $this->formatOutputSelector($extended);
    }

    protected static $libSelectorReplace = [
        ['selector', 'original', 'replacement'],
        ['selectors', 'original', 'replacement']
    ];
    protected function libSelectorReplace($args)
    {
        list($selectors, $original, $replacement) = $args;

        $selectors   = $this->getSelectorArg($selectors, 'selector');
        $original    = $this->getSelectorArg($original, 'original');
        $replacement = $this->getSelectorArg($replacement, 'replacement');

        if (! $selectors || ! $original || ! $replacement) {
            throw $this->error('selector-replace() invalid arguments');
        }

        $replaced = $this->extendOrReplaceSelectors($selectors, $original, $replacement, true);

        return $this->formatOutputSelector($replaced);
    }

    /**
     * Extend/replace in selectors
     * used by selector-extend and selector-replace that use the same logic
     *
     * @param array   $selectors
     * @param array   $extendee
     * @param array   $extender

<      * @param boolean $replace



>      * @param bool  $replace


     *
     * @return array
     */
    protected function extendOrReplaceSelectors($selectors, $extendee, $extender, $replace = false)
    {
        $saveExtends = $this->extends;
        $saveExtendsMap = $this->extendsMap;

        $this->extends = [];
        $this->extendsMap = [];

        foreach ($extendee as $es) {

>             if (\count($es) !== 1) {
            // only use the first one
>                 throw $this->error('Can\'t extend complex selector.');
            $this->pushExtends(reset($es), $extender, null);
>             }
        }
> 



        $extended = [];

        foreach ($selectors as $selector) {
            if (! $replace) {
                $extended[] = $selector;
            }

            $n = \count($extended);

            $this->matchExtends($selector, $extended);

            // if didnt match, keep the original selector if we are in a replace operation
            if ($replace && \count($extended) === $n) {
                $extended[] = $selector;
            }
        }

        $this->extends = $saveExtends;
        $this->extendsMap = $saveExtendsMap;

        return $extended;
    }

    protected static $libSelectorNest = ['selector...'];
    protected function libSelectorNest($args)
    {
        // get the selector... list
        $args = reset($args);
        $args = $args[2];

        if (\count($args) < 1) {
            throw $this->error('selector-nest() needs at least 1 argument');
        }

        $selectorsMap = [];
        foreach ($args as $arg) {
            $selectorsMap[] = $this->getSelectorArg($arg, 'selector', true);
        }


>         assert(!empty($selectorsMap));
        $envs = [];
> 



        foreach ($selectorsMap as $selectors) {
            $env = new Environment();
            $env->selectors = $selectors;

            $envs[] = $env;
        }

        $envs            = array_reverse($envs);
        $env             = $this->extractEnv($envs);
        $outputSelectors = $this->multiplySelectors($env);

        return $this->formatOutputSelector($outputSelectors);
    }

    protected static $libSelectorParse = [
        ['selector'],
        ['selectors']
    ];
    protected function libSelectorParse($args)
    {
        $selectors = reset($args);
        $selectors = $this->getSelectorArg($selectors, 'selector');

        return $this->formatOutputSelector($selectors);
    }

    protected static $libSelectorUnify = ['selectors1', 'selectors2'];
    protected function libSelectorUnify($args)
    {
        list($selectors1, $selectors2) = $args;

        $selectors1 = $this->getSelectorArg($selectors1, 'selectors1');
        $selectors2 = $this->getSelectorArg($selectors2, 'selectors2');

        if (! $selectors1 || ! $selectors2) {
            throw $this->error('selector-unify() invalid arguments');
        }

        // only consider the first compound of each
        $compound1 = reset($selectors1);
        $compound2 = reset($selectors2);

        // unify them and that's it
        $unified = $this->unifyCompoundSelectors($compound1, $compound2);

        return $this->formatOutputSelector($unified);
    }

    /**
     * The selector-unify magic as its best
     * (at least works as expected on test cases)
     *
     * @param array $compound1
     * @param array $compound2
     *

<      * @return array|mixed



>      * @return array


     */
    protected function unifyCompoundSelectors($compound1, $compound2)
    {
        if (! \count($compound1)) {
            return $compound2;
        }

        if (! \count($compound2)) {
            return $compound1;
        }

        // check that last part are compatible
        $lastPart1 = array_pop($compound1);
        $lastPart2 = array_pop($compound2);
        $last      = $this->mergeParts($lastPart1, $lastPart2);

        if (! $last) {
            return [[]];
        }

        $unifiedCompound = [$last];
        $unifiedSelectors = [$unifiedCompound];

        // do the rest
        while (\count($compound1) || \count($compound2)) {
            $part1 = end($compound1);
            $part2 = end($compound2);

            if ($part1 && ($match2 = $this->matchPartInCompound($part1, $compound2))) {
                list($compound2, $part2, $after2) = $match2;

                if ($after2) {
                    $unifiedSelectors = $this->prependSelectors($unifiedSelectors, $after2);
                }

                $c = $this->mergeParts($part1, $part2);
                $unifiedSelectors = $this->prependSelectors($unifiedSelectors, [$c]);

                $part1 = $part2 = null;

                array_pop($compound1);
            }

            if ($part2 && ($match1 = $this->matchPartInCompound($part2, $compound1))) {
                list($compound1, $part1, $after1) = $match1;

                if ($after1) {
                    $unifiedSelectors = $this->prependSelectors($unifiedSelectors, $after1);
                }

                $c = $this->mergeParts($part2, $part1);
                $unifiedSelectors = $this->prependSelectors($unifiedSelectors, [$c]);

                $part1 = $part2 = null;

                array_pop($compound2);
            }

            $new = [];

            if ($part1 && $part2) {
                array_pop($compound1);
                array_pop($compound2);

                $s   = $this->prependSelectors($unifiedSelectors, [$part2]);
                $new = array_merge($new, $this->prependSelectors($s, [$part1]));
                $s   = $this->prependSelectors($unifiedSelectors, [$part1]);
                $new = array_merge($new, $this->prependSelectors($s, [$part2]));
            } elseif ($part1) {
                array_pop($compound1);

                $new = array_merge($new, $this->prependSelectors($unifiedSelectors, [$part1]));
            } elseif ($part2) {
                array_pop($compound2);

                $new = array_merge($new, $this->prependSelectors($unifiedSelectors, [$part2]));
            }

            if ($new) {
                $unifiedSelectors = $new;
            }
        }

        return $unifiedSelectors;
    }

    /**
     * Prepend each selector from $selectors with $parts
     *
     * @param array $selectors
     * @param array $parts
     *
     * @return array
     */
    protected function prependSelectors($selectors, $parts)
    {
        $new = [];

        foreach ($selectors as $compoundSelector) {
            array_unshift($compoundSelector, $parts);

            $new[] = $compoundSelector;
        }

        return $new;
    }

    /**
     * Try to find a matching part in a compound:
     * - with same html tag name
     * - with some class or id or something in common
     *
     * @param array $part
     * @param array $compound
     *
     * @return array|false
     */
    protected function matchPartInCompound($part, $compound)
    {
        $partTag = $this->findTagName($part);
        $before  = $compound;
        $after   = [];

        // try to find a match by tag name first
        while (\count($before)) {
            $p = array_pop($before);

            if ($partTag && $partTag !== '*' && $partTag == $this->findTagName($p)) {
                return [$before, $p, $after];
            }

            $after[] = $p;
        }

        // try again matching a non empty intersection and a compatible tagname
        $before = $compound;
        $after = [];

        while (\count($before)) {
            $p = array_pop($before);

            if ($this->checkCompatibleTags($partTag, $this->findTagName($p))) {
                if (\count(array_intersect($part, $p))) {
                    return [$before, $p, $after];
                }
            }

            $after[] = $p;
        }

        return false;
    }

    /**
     * Merge two part list taking care that
     * - the html tag is coming first - if any
     * - the :something are coming last
     *
     * @param array $parts1
     * @param array $parts2
     *
     * @return array
     */
    protected function mergeParts($parts1, $parts2)
    {
        $tag1 = $this->findTagName($parts1);
        $tag2 = $this->findTagName($parts2);
        $tag  = $this->checkCompatibleTags($tag1, $tag2);

        // not compatible tags
        if ($tag === false) {
            return [];
        }

        if ($tag) {
            if ($tag1) {
                $parts1 = array_diff($parts1, [$tag1]);
            }

            if ($tag2) {
                $parts2 = array_diff($parts2, [$tag2]);
            }
        }

        $mergedParts = array_merge($parts1, $parts2);
        $mergedOrderedParts = [];

        foreach ($mergedParts as $part) {
            if (strpos($part, ':') === 0) {
                $mergedOrderedParts[] = $part;
            }
        }

        $mergedParts = array_diff($mergedParts, $mergedOrderedParts);
        $mergedParts = array_merge($mergedParts, $mergedOrderedParts);

        if ($tag) {
            array_unshift($mergedParts, $tag);
        }

        return $mergedParts;
    }

    /**
     * Check the compatibility between two tag names:
     * if both are defined they should be identical or one has to be '*'
     *
     * @param string $tag1
     * @param string $tag2
     *
     * @return array|false
     */
    protected function checkCompatibleTags($tag1, $tag2)
    {
        $tags = [$tag1, $tag2];
        $tags = array_unique($tags);
        $tags = array_filter($tags);

        if (\count($tags) > 1) {
            $tags = array_diff($tags, ['*']);
        }

        // not compatible nodes
        if (\count($tags) > 1) {
            return false;
        }

        return $tags;
    }

    /**
     * Find the html tag name in a selector parts list
     *

<      * @param array $parts



>      * @param string[] $parts


     *

<      * @return mixed|string



>      * @return string


     */
    protected function findTagName($parts)
    {
        foreach ($parts as $part) {
            if (! preg_match('/^[\[.:#%_-]/', $part)) {
                return $part;
            }
        }

        return '';
    }

    protected static $libSimpleSelectors = ['selector'];
    protected function libSimpleSelectors($args)
    {
        $selector = reset($args);
        $selector = $this->getSelectorArg($selector, 'selector');

        // remove selectors list layer, keeping the first one
        $selector = reset($selector);

        // remove parts list layer, keeping the first part
        $part = reset($selector);

        $listParts = [];

        foreach ($part as $p) {
            $listParts[] = [Type::T_STRING, '', [$p]];
        }

        return [Type::T_LIST, ',', $listParts];
    }

    protected static $libScssphpGlob = ['pattern'];
    protected function libScssphpGlob($args)
    {

<         $string = $this->coerceString($args[0]);



>         @trigger_error(sprintf('The "scssphp-glob" function is deprecated an will be removed in ScssPhp 2.0. Register your own alternative through "%s::registerFunction', __CLASS__), E_USER_DEPRECATED);
> 
>         $this->logger->warn('The "scssphp-glob" function is deprecated an will be removed in ScssPhp 2.0.', true);
> 
>         $string = $this->assertString($args[0], 'pattern');


        $pattern = $this->compileStringContent($string);
        $matches = glob($pattern);
        $listParts = [];

        foreach ($matches as $match) {
            if (! is_file($match)) {
                continue;
            }

            $listParts[] = [Type::T_STRING, '"', [$match]];
        }

        return [Type::T_LIST, ',', $listParts];
    }
}