text: <?php
  /**
   * "Inline" diff renderer.
   *
   * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
   *
   * See the enclosed file COPYING for license information (LGPL). If you did
   * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
   *
   * @author  Ciprian Popovici
   * @package Text_Diff
   */
  
  /** Text_Diff_Renderer */
  
  // WP #7391
  require_once dirname(dirname(__FILE__)) . '/Renderer.php';
  
  /**
   * "Inline" diff renderer.
   *
   * This class renders diffs in the Wiki-style "inline" format.
   *
   * @author  Ciprian Popovici
   * @package Text_Diff
   */
  class Text_Diff_Renderer_inline extends Text_Diff_Renderer {
  
      /**
       * Number of leading context "lines" to preserve.
       *
       * @var integer
       */
      var $_leading_context_lines = 10000;
  
      /**
       * Number of trailing context "lines" to preserve.
       *
       * @var integer
       */
      var $_trailing_context_lines = 10000;
  
      /**
       * Prefix for inserted text.
       *
       * @var string
       */
      var $_ins_prefix = '<ins>';
  
      /**
       * Suffix for inserted text.
       *
       * @var string
       */
      var $_ins_suffix = '</ins>';
  
      /**
       * Prefix for deleted text.
       *
       * @var string
       */
      var $_del_prefix = '<del>';
  
      /**
       * Suffix for deleted text.
       *
       * @var string
       */
      var $_del_suffix = '</del>';
  
      /**
       * Header for each change block.
       *
       * @var string
       */
      var $_block_header = '';
  
      /**
       * Whether to split down to character-level.
       *
       * @var boolean
       */
      var $_split_characters = false;
  
      /**
       * What are we currently splitting on? Used to recurse to show word-level
       * or character-level changes.
       *
       * @var string
       */
      var $_split_level = 'lines';
  
      function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
      {
          return $this->_block_header;
      }
  
      function _startBlock($header)
      {
          return $header;
      }
  
      function _lines($lines, $prefix = ' ', $encode = true)
      {
          if ($encode) {
              array_walk($lines, array(&$this, '_encode'));
          }
  
          if ($this->_split_level == 'lines') {
              return implode("\n", $lines) . "\n";
          } else {
              return implode('', $lines);
          }
      }
  
      function _added($lines)
      {
          array_walk($lines, array(&$this, '_encode'));
          $lines[0] = $this->_ins_prefix . $lines[0];
          $lines[count($lines) - 1] .= $this->_ins_suffix;
          return $this->_lines($lines, ' ', false);
      }
  
      function _deleted($lines, $words = false)
      {
          array_walk($lines, array(&$this, '_encode'));
          $lines[0] = $this->_del_prefix . $lines[0];
          $lines[count($lines) - 1] .= $this->_del_suffix;
          return $this->_lines($lines, ' ', false);
      }
  
      function _changed($orig, $final)
      {
          /* If we've already split on characters, just display. */
          if ($this->_split_level == 'characters') {
              return $this->_deleted($orig)
                  . $this->_added($final);
          }
  
          /* If we've already split on words, just display. */
          if ($this->_split_level == 'words') {
              $prefix = '';
              while ($orig[0] !== false && $final[0] !== false &&
                     substr($orig[0], 0, 1) == ' ' &&
                     substr($final[0], 0, 1) == ' ') {
                  $prefix .= substr($orig[0], 0, 1);
                  $orig[0] = substr($orig[0], 1);
                  $final[0] = substr($final[0], 1);
              }
              return $prefix . $this->_deleted($orig) . $this->_added($final);
          }
  
          $text1 = implode("\n", $orig);
          $text2 = implode("\n", $final);
  
          /* Non-printing newline marker. */
          $nl = "\0";
  
          if ($this->_split_characters) {
              $diff = new Text_Diff('native',
                                    array(preg_split('//', $text1),
                                          preg_split('//', $text2)));
          } else {
              /* We want to split on word boundaries, but we need to preserve
               * whitespace as well. Therefore we split on words, but include
               * all blocks of whitespace in the wordlist. */
              $diff = new Text_Diff('native',
                                    array($this->_splitOnWords($text1, $nl),
                                          $this->_splitOnWords($text2, $nl)));
          }
  
          /* Get the diff in inline format. */
          $renderer = new Text_Diff_Renderer_inline
              (array_merge($this->getParams(),
                           array('split_level' => $this->_split_characters ? 'characters' : 'words')));
  
          /* Run the diff and get the output. */
          return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
      }
  
      function _splitOnWords($string, $newlineEscape = "\n")
      {
          // Ignore \0; otherwise the while loop will never finish.
          $string = str_replace("\0", '', $string);
  
          $words = array();
          $length = strlen($string);
          $pos = 0;
  
          while ($pos < $length) {
              // Eat a word with any preceding whitespace.
              $spaces = strspn(substr($string, $pos), " \n");
              $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
              $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
              $pos += $spaces + $nextpos;
          }
  
          return $words;
      }
  
      function _encode(&$string)
      {
          $string = htmlspecialchars($string);
      }
  
  }
  