includes/parser/MWTidy.php

   1 <?php
   2 /**
   3  * HTML validation and correction
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23
  24 /**
  25  * Class to interact with HTML tidy
  26  *
  27  * Either the external tidy program or the in-process tidy extension
  28  * will be used depending on availability. Override the default
  29  * $wgTidyInternal setting to disable the internal if it's not working.
  30  *
  31  * @ingroup Parser
  32  */
  33 class MWTidy {
  34         private static $instance;
  35
  36         /**
  37          * Interface with html tidy.
  38          * If tidy isn't able to correct the markup, the original will be
  39          * returned in all its glory with a warning comment appended.
  40          *
  41          * @param string $text HTML input fragment. This should not contain a
  42          *                     <body> or <html> tag.
  43          * @return string Corrected HTML output
  44          * @throws MWException
  45          */
  46         public static function tidy( $text ) {
  47                 $driver = self::singleton();
  48                 if ( !$driver ) {
  49                         throw new MWException( __METHOD__ .
  50                                 ': tidy is disabled, caller should have checked MWTidy::isEnabled()' );
  51                 }
  52                 return $driver->tidy( $text );
  53         }
  54
  55         /**
  56          * @return bool
  57          */
  58         public static function isEnabled() {
  59                 return self::singleton() !== false;
  60         }
  61
  62         /**
  63          * @return bool|\MediaWiki\Tidy\TidyDriverBase
  64          */
  65         public static function singleton() {
  66                 global $wgUseTidy, $wgTidyInternal, $wgTidyConf, $wgDebugTidy, $wgTidyConfig,
  67                         $wgTidyBin, $wgTidyOpts;
  68
  69                 if ( self::$instance === null ) {
  70                         if ( $wgTidyConfig !== null ) {
  71                                 $config = $wgTidyConfig;
  72                         } elseif ( $wgUseTidy ) {
  73                                 // b/c configuration
  74                                 $config = [
  75                                         'tidyConfigFile' => $wgTidyConf,
  76                                         'debugComment' => $wgDebugTidy,
  77                                         'tidyBin' => $wgTidyBin,
  78                                         'tidyCommandLine' => $wgTidyOpts ];
  79                                 if ( $wgTidyInternal ) {
  80                                         if ( wfIsHHVM() ) {
  81                                                 $config['driver'] = 'RaggettInternalHHVM';
  82                                         } else {
  83                                                 $config['driver'] = 'RaggettInternalPHP';
  84                                         }
  85                                 } else {
  86                                         $config['driver'] = 'RaggettExternal';
  87                                 }
  88                         } else {
  89                                 return false;
  90                         }
  91                         self::$instance = self::factory( $config );
  92                 }
  93                 return self::$instance;
  94         }
  95
  96         /**
  97          * Create a new Tidy driver object from configuration.
  98          * @see $wgTidyConfig
  99          * @param array $config
 100          * @return bool|\MediaWiki\Tidy\TidyDriverBase
 101          * @throws MWException
 102          */
 103         public static function factory( array $config ) {
 104                 switch ( $config['driver'] ) {
 105                         case 'RaggettInternalHHVM':
 106                                 $instance = new MediaWiki\Tidy\RaggettInternalHHVM( $config );
 107                                 break;
 108                         case 'RaggettInternalPHP':
 109                                 $instance = new MediaWiki\Tidy\RaggettInternalPHP( $config );
 110                                 break;
 111                         case 'RaggettExternal':
 112                                 $instance = new MediaWiki\Tidy\RaggettExternal( $config );
 113                                 break;
 114                         case 'RemexHtml':
 115                                 $instance = new MediaWiki\Tidy\RemexDriver( $config );
 116                                 break;
 117                         case 'disabled':
 118                                 return false;
 119                         default:
 120                                 throw new MWException( "Invalid tidy driver: \"{$config['driver']}\"" );
 121                 }
 122                 return $instance;
 123         }
 124
 125         /**
 126          * Set the driver to be used. This is for testing.
 127          * @param MediaWiki\Tidy\TidyDriverBase|false|null $instance
 128          */
 129         public static function setInstance( $instance ) {
 130                 self::$instance = $instance;
 131         }
 132
 133         /**
 134          * Destroy the current singleton instance
 135          */
 136         public static function destroySingleton() {
 137                 self::$instance = null;
 138         }
 139 }