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Differences Between: [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Moodle implementation of SCSS.
  19   *
  20   * @package    core
  21   * @copyright  2016 Frédéric Massart
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  /**
  28   * Moodle SCSS compiler class.
  29   *
  30   * @package    core
  31   * @copyright  2016 Frédéric Massart
  32   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33   */
  34  class core_scss extends \ScssPhp\ScssPhp\Compiler {
  35  
  36      /** @var string The path to the SCSS file. */
  37      protected $scssfile;
  38      /** @var array Bits of SCSS content to prepend. */
  39      protected $scssprepend = array();
  40      /** @var array Bits of SCSS content. */
  41      protected $scsscontent = array();
  42  
  43      /**
  44       * Add variables.
  45       *
  46       * @param array $scss Associative array of variables and their values.
  47       * @return void
  48       */
  49      public function add_variables(array $variables) {
  50          $this->setVariables($variables);
  51      }
  52  
  53      /**
  54       * Append raw SCSS to what's to compile.
  55       *
  56       * @param string $scss SCSS code.
  57       * @return void
  58       */
  59      public function append_raw_scss($scss) {
  60          $this->scsscontent[] = $scss;
  61      }
  62  
  63      /**
  64       * Prepend raw SCSS to what's to compile.
  65       *
  66       * @param string $scss SCSS code.
  67       * @return void
  68       */
  69      public function prepend_raw_scss($scss) {
  70          $this->scssprepend[] = $scss;
  71      }
  72  
  73      /**
  74       * Set the file to compile from.
  75       *
  76       * The purpose of this method is to provide a way to import the
  77       * content of a file without messing with the import directories.
  78       *
  79       * @param string $filepath The path to the file.
  80       * @return void
  81       */
  82      public function set_file($filepath) {
  83          $this->scssfile = $filepath;
  84          $this->setImportPaths([dirname($filepath)]);
  85      }
  86  
  87      /**
  88       * Compiles to CSS.
  89       *
  90       * @return string
  91       */
  92      public function to_css() {
  93          $content = implode(';', $this->scssprepend);
  94          if (!empty($this->scssfile)) {
  95              $content .= file_get_contents($this->scssfile);
  96          }
  97          $content .= implode(';', $this->scsscontent);
  98          return $this->compile($content);
  99      }
 100  
 101      /**
 102       * Compile scss.
 103       *
 104       * Overrides ScssPHP's implementation, using the SassC compiler if it is available.
 105       *
 106       * @param string $code SCSS to compile.
 107       * @param string $path Path to SCSS to compile.
 108       *
 109       * @return string The compiled CSS.
 110       */
 111      public function compile($code, $path = null) {
 112          global $CFG;
 113  
 114          $pathtosassc = trim($CFG->pathtosassc ?? '');
 115  
 116          if (!empty($pathtosassc) && is_executable($pathtosassc) && !is_dir($pathtosassc)) {
 117              $process = proc_open(
 118                  $pathtosassc . ' -I' . implode(':', $this->importPaths) . ' -s',
 119                  [
 120                      ['pipe', 'r'], // Set the process stdin pipe to read mode.
 121                      ['pipe', 'w'], // Set the process stdout pipe to write mode.
 122                      ['pipe', 'w'] // Set the process stderr pipe to write mode.
 123                  ],
 124                  $pipes // Pipes become available in $pipes (pass by reference).
 125              );
 126              if (is_resource($process)) {
 127                  fwrite($pipes[0], $code); // Write the raw scss to the sassc process stdin.
 128                  fclose($pipes[0]);
 129  
 130                  $stdout = stream_get_contents($pipes[1]);
 131                  $stderr = stream_get_contents($pipes[2]);
 132  
 133                  fclose($pipes[1]);
 134                  fclose($pipes[2]);
 135  
 136                  // The proc_close function returns the process exit status. Anything other than 0 is bad.
 137                  if (proc_close($process) !== 0) {
 138                      throw new coding_exception($stderr);
 139                  }
 140  
 141                  // Compiled CSS code will be available from stdout.
 142                  return $stdout;
 143              }
 144          }
 145  
 146          return parent::compile($code, $path);
 147      }
 148  
 149      /**
 150       * Compile child; returns a value to halt execution
 151       *
 152       * @param array $child
 153       * @param \ScssPhp\ScssPhp\Formatter\OutputBlock $out
 154       *
 155       * @return array|null
 156       */
 157      protected function compileChild($child, \ScssPhp\ScssPhp\Formatter\OutputBlock $out) {
 158          switch($child[0]) {
 159              case \ScssPhp\ScssPhp\Type::T_SCSSPHP_IMPORT_ONCE:
 160              case \ScssPhp\ScssPhp\Type::T_IMPORT:
 161                  list(, $rawpath) = $child;
 162                  $rawpath = $this->reduce($rawpath);
 163                  $path = $this->compileStringContent($rawpath);
 164                  if ($path = $this->findImport($path)) {
 165                      if ($this->is_valid_file($path)) {
 166                          return parent::compileChild($child, $out);
 167                      } else {
 168                          // Sneaky stuff, don't let non scss file in.
 169                          debugging("Can't import scss file - " . $path, DEBUG_DEVELOPER);
 170                      }
 171                  }
 172                  break;
 173              default:
 174                  return parent::compileChild($child, $out);
 175          }
 176      }
 177  
 178      /**
 179       * Is the given file valid for import ?
 180       *
 181       * @param $path
 182       * @return bool
 183       */
 184      protected function is_valid_file($path) {
 185          global $CFG;
 186  
 187          $realpath = realpath($path);
 188  
 189          // Additional theme directory.
 190          $addthemedirectory = core_component::get_plugin_types()['theme'];
 191          $addrealroot = realpath($addthemedirectory);
 192  
 193          // Original theme directory.
 194          $themedirectory = $CFG->dirroot . "/theme";
 195          $realroot = realpath($themedirectory);
 196  
 197          // File should end in .scss and must be in sites theme directory, else ignore it.
 198          $pathvalid = $realpath !== false;
 199          $pathvalid = $pathvalid && (substr($path, -5) === '.scss');
 200          $pathvalid = $pathvalid && (strpos($realpath, $realroot) === 0 || strpos($realpath, $addrealroot) === 0);
 201          return $pathvalid;
 202      }
 203  }