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Developer Documentation
See Release Notes
Long Term Support Release
- Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
- Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
- PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.
/lib/minify/matthiasmullie-minify/src/ -> JS.php (source)
<?php
/**
* JavaScript minifier
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @author Matthias Mullie <minify@mullie.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
namespace MatthiasMullie\Minify;
/**
* JavaScript Minifier Class
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @package Minify
* @author Matthias Mullie <minify@mullie.eu>
* @author Tijs Verkoyen <minify@verkoyen.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
class JS extends Minify
{
/**
* Var-matching regex based on http://stackoverflow.com/a/9337047/802993.
*
* Note that regular expressions using that bit must have the PCRE_UTF8
* pattern modifier (/u) set.
*
* @var string
*/
const REGEX_VARIABLE = 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/**
* Full list of JavaScript reserved words.
* Will be loaded from /data/js/keywords_reserved.txt.
*
* @see https://mathiasbynens.be/notes/reserved-keywords
*
* @var string[]
*/
protected $keywordsReserved = array();
/**
* List of JavaScript reserved words that accept a <variable, value, ...>
* after them. Some end of lines are not the end of a statement, like with
* these keywords.
*
* E.g.: we shouldn't insert a ; after this else
* else
* console.log('this is quite fine')
*
* Will be loaded from /data/js/keywords_before.txt
*
* @var string[]
*/
protected $keywordsBefore = array();
/**
* List of JavaScript reserved words that accept a <variable, value, ...>
* before them. Some end of lines are not the end of a statement, like when
* continued by one of these keywords on the newline.
*
* E.g.: we shouldn't insert a ; before this instanceof
* variable
* instanceof String
*
* Will be loaded from /data/js/keywords_after.txt
*
* @var string[]
*/
protected $keywordsAfter = array();
/**
* List of all JavaScript operators.
*
* Will be loaded from /data/js/operators.txt
*
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
*
* @var string[]
*/
protected $operators = array();
/**
* List of JavaScript operators that accept a <variable, value, ...> after
* them. Some end of lines are not the end of a statement, like with these
* operators.
*
* Note: Most operators are fine, we've only removed ++ and --.
* ++ & -- have to be joined with the value they're in-/decrementing.
*
* Will be loaded from /data/js/operators_before.txt
*
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
*
* @var string[]
*/
protected $operatorsBefore = array();
/**
* List of JavaScript operators that accept a <variable, value, ...> before
* them. Some end of lines are not the end of a statement, like when
* continued by one of these operators on the newline.
*
* Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~.
* There can't be a newline separating ! or ~ and whatever it is negating.
* ++ & -- have to be joined with the value they're in-/decrementing.
* ) & ] are "special" in that they have lots or usecases. () for example
* is used for function calls, for grouping, in if () and for (), ...
*
* Will be loaded from /data/js/operators_after.txt
*
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
*
* @var string[]
*/
protected $operatorsAfter = array();
/**
* {@inheritdoc}
*/
public function __construct()
{
call_user_func_array(array('parent', '__construct'), func_get_args());
$dataDir = __DIR__.'/../data/js/';
$options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
$this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options);
$this->keywordsBefore = file($dataDir.'keywords_before.txt', $options);
$this->keywordsAfter = file($dataDir.'keywords_after.txt', $options);
$this->operators = file($dataDir.'operators.txt', $options);
$this->operatorsBefore = file($dataDir.'operators_before.txt', $options);
$this->operatorsAfter = file($dataDir.'operators_after.txt', $options);
}
/**
* Minify the data.
* Perform JS optimizations.
*
* @param string[optional] $path Path to write the data to
*
* @return string The minified data
*/
public function execute($path = null)
{
$content = '';
/*
* Let's first take out strings, comments and regular expressions.
* All of these can contain JS code-like characters, and we should make
* sure any further magic ignores anything inside of these.
*
* Consider this example, where we should not strip any whitespace:
* var str = "a test";
*
* Comments will be removed altogether, strings and regular expressions
* will be replaced by placeholder text, which we'll restore later.
*/
$this->extractStrings('\'"`');
$this->stripComments();
$this->extractRegex();
// loop files
foreach ($this->data as $source => $js) {
// take out strings, comments & regex (for which we've registered
// the regexes just a few lines earlier)
$js = $this->replace($js);
$js = $this->propertyNotation($js);
$js = $this->shortenBools($js);
$js = $this->stripWhitespace($js);
// combine js: separating the scripts by a ;
$content .= $js.";";
}
// clean up leftover `;`s from the combination of multiple scripts
$content = ltrim($content, ';');
$content = (string) substr($content, 0, -1);
/*
* Earlier, we extracted strings & regular expressions and replaced them
* with placeholder text. This will restore them.
*/
$content = $this->restoreExtractedData($content);
return $content;
}
/**
* Strip comments from source code.
*/
protected function stripComments()
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$callback = function ($match) use ($minifier) {
> if (
$count = count($minifier->extracted);
> substr($match[2], 0, 1) === '!' ||
$placeholder = '/*'.$count.'*/';
> strpos($match[2], '@license') !== false ||
$minifier->extracted[$placeholder] = $match[0];
> strpos($match[2], '@preserve') !== false
> ) {
return $placeholder;
> // preserve multi-line comments that start with /*!
};
> // or contain @license or @preserve annotations
< return $placeholder;
> return $match[1] . $placeholder . $match[3];
> }
>
> return $match[1] . $match[3];
$this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);
>
< $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);
< $this->registerPattern('/\/\*.*?\*\//s', '');
> $this->registerPattern('/(\n?)\/\*(.*?)\*\/(\n?)/s', $callback);
// single-line comments
$this->registerPattern('/\/\/.*$/m', '');
}
/**
* JS can have /-delimited regular expressions, like: /ab+c/.match(string).
*
* The content inside the regex can contain characters that may be confused
* for JS code: e.g. it could contain whitespace it needs to match & we
* don't want to strip whitespace in there.
*
* The regex can be pretty simple: we don't have to care about comments,
* (which also use slashes) because stripComments() will have stripped those
* already.
*
* This method will replace all string content with simple REGEX#
* placeholder text, so we've rid all regular expressions from characters
* that may be misinterpreted. Original regex content will be saved in
* $this->extracted and after doing all other minifying, we can restore the
* original content via restoreRegex()
*/
protected function extractRegex()
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$callback = function ($match) use ($minifier) {
$count = count($minifier->extracted);
$placeholder = '"'.$count.'"';
$minifier->extracted[$placeholder] = $match[0];
return $placeholder;
};
// match all chars except `/` and `\`
// `\` is allowed though, along with whatever char follows (which is the
// one being escaped)
// this should allow all chars, except for an unescaped `/` (= the one
// closing the regex)
// then also ignore bare `/` inside `[]`, where they don't need to be
// escaped: anything inside `[]` can be ignored safely
$pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*';
// a regular expression can only be followed by a few operators or some
// of the RegExp methods (a `\` followed by a variable or value is
// likely part of a division, not a regex)
$keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof');
< $before = '([=:,;\+\-\*\/\}\(\{\[&\|!]|^|'.implode('|', $keywords).')\s*';
> $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|'.implode('|', $keywords).')\s*';
$propertiesAndMethods = array(
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
'constructor',
'flags',
'global',
'ignoreCase',
'multiline',
'source',
'sticky',
'unicode',
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
'compile(',
'exec(',
'test(',
'toSource(',
'toString(',
);
$delimiters = array_fill(0, count($propertiesAndMethods), '/');
$propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
< $after = '(?=\s*([\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))';
> $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))';
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
// regular expressions following a `)` are rather annoying to detect...
// quite often, `/` after `)` is a division operator & if it happens to
// be followed by another one (or a comment), it is likely to be
// confused for a regular expression
// however, it's perfectly possible for a regex to follow a `)`: after
// a single-line `if()`, `while()`, ... statement, for example
// since, when they occur like that, they're always the start of a
// statement, there's only a limited amount of ways they can be useful:
// by calling the regex methods directly
// if a regex following `)` is not followed by `.<property or method>`,
// it's quite likely not a regex
$before = '\)\s*';
$after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))';
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
// 1 more edge case: a regex can be followed by a lot more operators or
// keywords if there's a newline (ASI) in between, where the operator
// actually starts a new statement
// (https://github.com/matthiasmullie/minify/issues/56)
$operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
$operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
$after = '(?=\s*\n\s*('.implode('|', $operators).'))';
$this->registerPattern('/'.$pattern.$after.'/', $callback);
}
/**
* Strip whitespace.
*
* We won't strip *all* whitespace, but as much as possible. The thing that
* we'll preserve are newlines we're unsure about.
* JavaScript doesn't require statements to be terminated with a semicolon.
* It will automatically fix missing semicolons with ASI (automatic semi-
* colon insertion) at the end of line causing errors (without semicolon.)
*
* Because it's sometimes hard to tell if a newline is part of a statement
* that should be terminated or not, we'll just leave some of them alone.
*
* @param string $content The content to strip the whitespace for
*
* @return string
*/
protected function stripWhitespace($content)
{
// uniform line endings, make them all line feed
$content = str_replace(array("\r\n", "\r"), "\n", $content);
// collapse all non-line feed whitespace into a single space
$content = preg_replace('/[^\S\n]+/', ' ', $content);
// strip leading & trailing whitespace
$content = str_replace(array(" \n", "\n "), "\n", $content);
// collapse consecutive line feeds into just 1
$content = preg_replace('/\n+/', "\n", $content);
$operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
$operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
$operators = $this->getOperatorsForRegex($this->operators, '/');
$keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
$keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
// strip whitespace that ends in (or next line begin with) an operator
// that allows statements to be broken up over multiple lines
unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
$content = preg_replace(
array(
'/('.implode('|', $operatorsBefore).')\s+/',
'/\s+('.implode('|', $operatorsAfter).')/',
),
'\\1',
$content
);
// make sure + and - can't be mistaken for, or joined into ++ and --
$content = preg_replace(
array(
'/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
'/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
),
'\\1',
$content
);
// collapse whitespace around reserved words into single space
$content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
$content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
/*
* We didn't strip whitespace after a couple of operators because they
* could be used in different contexts and we can't be sure it's ok to
* strip the newlines. However, we can safely strip any non-line feed
* whitespace that follows them.
*/
$operatorsDiffBefore = array_diff($operators, $operatorsBefore);
$operatorsDiffAfter = array_diff($operators, $operatorsAfter);
$content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
$content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
/*
* Whitespace after `return` can be omitted in a few occasions
* (such as when followed by a string or regex)
* Same for whitespace in between `)` and `{`, or between `{` and some
* keywords.
*/
$content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
$content = preg_replace('/\)\s+\{/', '){', $content);
$content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content);
/*
* Get rid of double semicolons, except where they can be used like:
* "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
* I'll safeguard these double semicolons inside for-loops by
* temporarily replacing them with an invalid condition: they won't have
* a double semicolon and will be easy to spot to restore afterwards.
*/
$content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
$content = preg_replace('/;+/', ';', $content);
$content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
/*
* Next, we'll be removing all semicolons where ASI kicks in.
* for-loops however, can have an empty body (ending in only a
* semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
* Here, nothing happens during the loop; it's just used to keep
* increasing `i`. With that ; omitted, the next line would be expected
* to be the for-loop's body... Same goes for while loops.
* I'm going to double that semicolon (if any) so after the next line,
* which strips semicolons here & there, we're still left with this one.
< */
< $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);
> * Note the special recursive construct in the three inner parts of the for:
> * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline
> * functions bodies, e.g.: i<arr.map(function(e){return e}).length.
> * Also note that the construct is applied only once and multiplied
> * for each part of the for, otherwise it risks a catastrophic backtracking.
> * The limitation is that it will not allow closures in more than one
> * of the three parts for a specific for() case.
> * REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content);
> */
> $content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
> $content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
> $content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content);
>
$content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
>
/*
> /*
* Below will also keep `;` after a `do{}while();` along with `while();`
> * Do the same for the if's that don't have a body but are followed by ;}
* While these could be stripped after do-while, detecting this
> */
* distinction is cumbersome, so I'll play it safe and make sure `;`
> $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content);
* after any kind of `while` is kept.
>
*/
$content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
/*
* We also can't strip empty else-statements. Even though they're
* useless and probably shouldn't be in the code in the first place, we
* shouldn't be stripping the `;` that follows it as it breaks the code.
* We can just remove those useless else-statements completely.
*
* @see https://github.com/matthiasmullie/minify/issues/91
*/
$content = preg_replace('/else;/s', '', $content);
/*
* We also don't really want to terminate statements followed by closing
* curly braces (which we've ignored completely up until now) or end-of-
* script: ASI will kick in here & we're all about minifying.
* Semicolons at beginning of the file don't make any sense either.
*/
$content = preg_replace('/;(\}|$)/s', '\\1', $content);
$content = ltrim($content, ';');
// get rid of remaining whitespace af beginning/end
return trim($content);
}
/**
* We'll strip whitespace around certain operators with regular expressions.
* This will prepare the given array by escaping all characters.
*
* @param string[] $operators
* @param string $delimiter
*
* @return string[]
*/
protected function getOperatorsForRegex(array $operators, $delimiter = '/')
{
// escape operators for use in regex
$delimiters = array_fill(0, count($operators), $delimiter);
$escaped = array_map('preg_quote', $operators, $delimiters);
$operators = array_combine($operators, $escaped);
// ignore + & - for now, they'll get special treatment
unset($operators['+'], $operators['-']);
// dot can not just immediately follow a number; it can be confused for
// decimal point, or calling a method on it, e.g. 42 .toString()
$operators['.'] = '(?<![0-9]\s)\.';
// don't confuse = with other assignment shortcuts (e.g. +=)
$chars = preg_quote('+-*\=<>%&|', $delimiter);
$operators['='] = '(?<!['.$chars.'])\=';
return $operators;
}
/**
* We'll strip whitespace around certain keywords with regular expressions.
* This will prepare the given array by escaping all characters.
*
* @param string[] $keywords
* @param string $delimiter
*
* @return string[]
*/
protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
{
// escape keywords for use in regex
$delimiter = array_fill(0, count($keywords), $delimiter);
$escaped = array_map('preg_quote', $keywords, $delimiter);
// add word boundaries
array_walk($keywords, function ($value) {
return '\b'.$value.'\b';
});
$keywords = array_combine($keywords, $escaped);
return $keywords;
}
/**
* Replaces all occurrences of array['key'] by array.key.
*
* @param string $content
*
* @return string
*/
protected function propertyNotation($content)
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$keywords = $this->keywordsReserved;
$callback = function ($match) use ($minifier, $keywords) {
$property = trim($minifier->extracted[$match[1]], '\'"');
/*
* Check if the property is a reserved keyword. In this context (as
* property of an object literal/array) it shouldn't matter, but IE8
* freaks out with "Expected identifier".
*/
if (in_array($property, $keywords)) {
return $match[0];
}
/*
* See if the property is in a variable-like format (e.g.
* array['key-here'] can't be replaced by array.key-here since '-'
* is not a valid character there.
*/
if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
return $match[0];
}
return '.'.$property;
};
/*
* Figure out if previous character is a variable name (of the array
* we want to use property notation on) - this is to make sure
* standalone ['value'] arrays aren't confused for keys-of-an-array.
* We can (and only have to) check the last character, because PHP's
* regex implementation doesn't allow unfixed-length look-behind
* assertions.
*/
preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
$previousChar = $previousChar[1];
/*
* Make sure word preceding the ['value'] is not a keyword, e.g.
* return['x']. Because -again- PHP's regex implementation doesn't allow
* unfixed-length look-behind assertions, I'm just going to do a lot of
* separate look-behind assertions, one for each keyword.
*/
$keywords = $this->getKeywordsForRegex($keywords);
$keywords = '(?<!'.implode(')(?<!', $keywords).')';
return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
}
/**
* Replaces true & false by !0 and !1.
*
* @param string $content
*
* @return string
*/
protected function shortenBools($content)
{
/*
* 'true' or 'false' could be used as property names (which may be
* followed by whitespace) - we must not replace those!
* Since PHP doesn't allow variable-length (to account for the
* whitespace) lookbehind assertions, I need to capture the leading
* character and check if it's a `.`
*/
$callback = function ($match) {
if (trim($match[1]) === '.') {
return $match[0];
}
return $match[1].($match[2] === 'true' ? '!0' : '!1');
};
$content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
// for(;;) is exactly the same as while(true), but shorter :)
$content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
// now make sure we didn't turn any do ... while(true) into do ... for(;;)
preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
// go backward to make sure positional offsets aren't altered when $content changes
$dos = array_reverse($dos);
foreach ($dos as $do) {
$offsetDo = $do[0][1];
// find all `while` (now `for`) following `do`: one of those must be
// associated with the `do` and be turned back into `while`
preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
foreach ($whiles as $while) {
$offsetWhile = $while[0][1];
$open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
$close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
if ($open === $close) {
// only restore `while` if amount of `{` and `}` are the same;
// otherwise, that `for` isn't associated with this `do`
$content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
break;
}
}
}
return $content;
}
}
