[Summary view] [Print] [Text view]

   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   * JS and CSS compression.
  19   *
  20   * @package    core
  21   * @copyright  2013 Petr Skoda {@link http://skodak.org}
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  /**
  28   * Collection of JS and CSS compression methods.
  29   */
  30  class core_minify {
  31      /**
  32       * Minify JS code.
  33       *
  34       * @param string $content
  35       * @return string minified JS code
  36       */
  37      public static function js($content) {
  38          global $CFG;
  39          require_once("$CFG->libdir/minify/lib/JSMinPlus.php");
  40  
  41          try {
  42              ob_start(); // JSMinPlus just echos errors, weird...
  43              $compressed = JSMinPlus::minify($content);
  44              if ($compressed !== false) {
  45                  ob_end_clean();
  46                  return $compressed;
  47              }
  48              $error = ob_get_clean();
  49  
  50          } catch (Exception $e) {
  51              ob_end_clean();
  52              $error = $e->getMessage();
  53          }
  54  
  55          $return = <<<EOD
  56  
  57  try {console.log('Error: Minimisation of JavaScript failed!');} catch (e) {}
  58  
  59  // Error: $error
  60  // Problem detected during JavaScript minimisation, please review the following code
  61  // =================================================================================
  62  
  63  
  64  EOD;
  65  
  66          return $return.$content;
  67      }
  68  
  69      /**
  70       * Minify JS files.
  71       *
  72       * @param array $files
  73       * @return string minified JS code
  74       */
  75      public static function js_files(array $files) {
  76          if (empty($files)) {
  77              return '';
  78          }
  79  
  80          $compressed = array();
  81          foreach ($files as $file) {
  82              $content = file_get_contents($file);
  83              if ($content === false) {
  84                  $compressed[] = "\n\n// Cannot read JS file ".basename(dirname(dirname($file))).'/'.basename(dirname($file)).'/'.basename($file)."\n\n";
  85                  continue;
  86              }
  87              $compressed[] = self::js($content);
  88          }
  89  
  90          return implode(";\n", $compressed);
  91      }
  92  
  93      /**
  94       * Minify CSS code.
  95       *
  96       * @param string $content
  97       * @return string minified CSS
  98       */
  99      public static function css($content) {
 100          global $CFG;
 101          require_once("$CFG->libdir/minify/lib/Minify/CSS/Compressor.php");
 102  
 103          $error = 'unknown';
 104          try {
 105              $compressed = Minify_CSS_Compressor::process($content);
 106              if ($compressed !== false) {
 107                  return $compressed;
 108              }
 109  
 110          } catch (Exception $e) {
 111              $error = $e->getMessage();
 112          }
 113  
 114          $return = <<<EOD
 115  
 116  /* Error: $error */
 117  /* Problem detected during CSS minimisation, please review the following code */
 118  /* ========================================================================== */
 119  
 120  
 121  EOD;
 122  
 123          return $return.$content;
 124      }
 125  
 126      /**
 127       * Minify CSS files.
 128       *
 129       * @param array $files
 130       * @return string minified CSS code
 131       */
 132      public static function css_files(array $files) {
 133          if (empty($files)) {
 134              return '';
 135          }
 136  
 137          $compressed = array();
 138          foreach ($files as $file) {
 139              $content = file_get_contents($file);
 140              if ($content === false) {
 141                  $compressed[] = "\n\n/* Cannot read CSS file ".basename(dirname(dirname($file))).'/'.basename(dirname($file)).'/'.basename($file)."*/\n\n";
 142                  continue;
 143              }
 144              $compressed[] = self::css($content);
 145          }
 146  
 147          return implode("\n", $compressed);
 148      }
 149  }