lib/classes/minify.php

   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         try {
  39             $minifier = new MatthiasMullie\Minify\JS($content);
  40             return $minifier->minify();
  41         } catch (Exception $e) {
  42             ob_end_clean();
  43             $error = $e->getMessage();
  44         }
  45
  46         $return = <<<EOD
  47
  48 try {console.log('Error: Minimisation of JavaScript failed!');} catch (e) {}
  49
  50 // Error: $error
  51 // Problem detected during JavaScript minimisation, please review the following code
  52 // =================================================================================
  53
  54
  55 EOD;
  56
  57         return $return.$content;
  58     }
  59
  60     /**
  61      * Minify JS files.
  62      *
  63      * @param array $files
  64      * @return string minified JS code
  65      */
  66     public static function js_files(array $files) {
  67         if (empty($files)) {
  68             return '';
  69         }
  70
  71         $compressed = array();
  72         foreach ($files as $file) {
  73             $content = file_get_contents($file);
  74             if ($content === false) {
  75                 $compressed[] = "\n\n// Cannot read JS file ".basename(dirname(dirname($file))).'/'.basename(dirname($file)).'/'.basename($file)."\n\n";
  76                 continue;
  77             }
  78             $compressed[] = self::js($content);
  79         }
  80
  81         return implode(";\n", $compressed);
  82     }
  83
  84     /**
  85      * Minify CSS code.
  86      *
  87      * @param string $content
  88      * @return string minified CSS
  89      */
  90     public static function css($content) {
  91         $error = 'unknown';
  92         try {
  93             $minifier = new MatthiasMullie\Minify\CSS($content);
  94             return $minifier->minify();
  95         } catch (Exception $e) {
  96             $error = $e->getMessage();
  97         }
  98
  99         $return = <<<EOD
 100
 101 /* Error: $error */
 102 /* Problem detected during CSS minimisation, please review the following code */
 103 /* ========================================================================== */
 104
 105
 106 EOD;
 107
 108         return $return.$content;
 109     }
 110
 111     /**
 112      * Minify CSS files.
 113      *
 114      * @param array $files
 115      * @return string minified CSS code
 116      */
 117     public static function css_files(array $files) {
 118         if (empty($files)) {
 119             return '';
 120         }
 121
 122         $compressed = array();
 123         foreach ($files as $file) {
 124             $content = file_get_contents($file);
 125             if ($content === false) {
 126                 $compressed[] = "\n\n/* Cannot read CSS file ".basename(dirname(dirname($file))).'/'.basename(dirname($file)).'/'.basename($file)."*/\n\n";
 127                 continue;
 128             }
 129             $compressed[] = self::css($content);
 130         }
 131
 132         return implode("\n", $compressed);
 133     }
 134 }