includes/content/TextContentHandler.php

   1 <?php
   2 /**
   3  * Base content handler class for flat text contents.
   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  * @since 1.21
  21  *
  22  * @file
  23  * @ingroup Content
  24  */
  25
  26 /**
  27  * Base content handler implementation for flat text contents.
  28  *
  29  * @ingroup Content
  30  */
  31 class TextContentHandler extends ContentHandler {
  32
  33         // @codingStandardsIgnoreStart bug 57585
  34         public function __construct( $modelId = CONTENT_MODEL_TEXT,
  35                 $formats = array( CONTENT_FORMAT_TEXT ) ) {
  36                 parent::__construct( $modelId, $formats );
  37         }
  38         // @codingStandardsIgnoreEnd
  39
  40         /**
  41          * Returns the content's text as-is.
  42          *
  43          * @param Content $content
  44          * @param string $format The serialization format to check
  45          *
  46          * @return mixed
  47          */
  48         public function serializeContent( Content $content, $format = null ) {
  49                 $this->checkFormat( $format );
  50
  51                 return $content->getNativeData();
  52         }
  53
  54         /**
  55          * Attempts to merge differences between three versions. Returns a new
  56          * Content object for a clean merge and false for failure or a conflict.
  57          *
  58          * All three Content objects passed as parameters must have the same
  59          * content model.
  60          *
  61          * This text-based implementation uses wfMerge().
  62          *
  63          * @param Content $oldContent The page's previous content.
  64          * @param Content $myContent One of the page's conflicting contents.
  65          * @param Content $yourContent One of the page's conflicting contents.
  66          *
  67          * @return Content|bool
  68          */
  69         public function merge3( Content $oldContent, Content $myContent, Content $yourContent ) {
  70                 $this->checkModelID( $oldContent->getModel() );
  71                 $this->checkModelID( $myContent->getModel() );
  72                 $this->checkModelID( $yourContent->getModel() );
  73
  74                 $format = $this->getDefaultFormat();
  75
  76                 $old = $this->serializeContent( $oldContent, $format );
  77                 $mine = $this->serializeContent( $myContent, $format );
  78                 $yours = $this->serializeContent( $yourContent, $format );
  79
  80                 $ok = wfMerge( $old, $mine, $yours, $result );
  81
  82                 if ( !$ok ) {
  83                         return false;
  84                 }
  85
  86                 if ( !$result ) {
  87                         return $this->makeEmptyContent();
  88                 }
  89
  90                 $mergedContent = $this->unserializeContent( $result, $format );
  91
  92                 return $mergedContent;
  93         }
  94
  95         /**
  96          * Returns the name of the associated Content class, to
  97          * be used when creating new objects. Override expected
  98          * by subclasses.
  99          *
 100          * @since 1.24
 101          *
 102          * @return string
 103          */
 104         protected function getContentClass() {
 105                 return 'TextContent';
 106         }
 107
 108         /**
 109          * Unserializes a Content object of the type supported by this ContentHandler.
 110          *
 111          * @since 1.21
 112          *
 113          * @param string $text Serialized form of the content
 114          * @param string $format The format used for serialization
 115          *
 116          * @return Content The TextContent object wrapping $text
 117          */
 118         public function unserializeContent( $text, $format = null ) {
 119                 $this->checkFormat( $format );
 120
 121                 $class = $this->getContentClass();
 122                 return new $class( $text );
 123         }
 124
 125         /**
 126          * Creates an empty TextContent object.
 127          *
 128          * @since 1.21
 129          *
 130          * @return Content A new TextContent object with empty text.
 131          */
 132         public function makeEmptyContent() {
 133                 $class = $this->getContentClass();
 134                 return new $class( '' );
 135         }
 136
 137 }