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   1  <?php
   2  /**
   3   * "Inline" diff renderer.
   4   *
   5   * $Horde: framework/Text_Diff/Diff/Renderer/inline.php,v 1.4.10.14 2008/01/04 10:37:27 jan Exp $
   6   *
   7   * Copyright 2004-2008 The Horde Project (http://www.horde.org/)
   8   *
   9   * See the enclosed file COPYING for license information (LGPL). If you did
  10   * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
  11   *
  12   * @author  Ciprian Popovici
  13   * @package Text_Diff
  14   */
  15  
  16  // Disallow direct access to this file for security reasons
  17  if(!defined("IN_MYBB"))
  18  {
  19      die("Direct initialization of this file is not allowed.<br /><br />Please make sure IN_MYBB is defined.");
  20  }
  21   
  22  /** Text_Diff_Renderer */
  23  require_once  MYBB_ROOT.'inc/3rdparty/diff/Diff/Renderer.php';
  24  
  25  /**
  26   * "Inline" diff renderer.
  27   *
  28   * This class renders diffs in the Wiki-style "inline" format.
  29   *
  30   * @author  Ciprian Popovici
  31   * @package Text_Diff
  32   */
  33  class Text_Diff_Renderer_inline extends Text_Diff_Renderer {
  34  
  35      /**
  36       * Number of leading context "lines" to preserve.
  37       */
  38      var $_leading_context_lines = 10000;
  39  
  40      /**
  41       * Number of trailing context "lines" to preserve.
  42       */
  43      var $_trailing_context_lines = 10000;
  44  
  45      /**
  46       * Prefix for inserted text.
  47       */
  48      var $_ins_prefix = '<ins>';
  49  
  50      /**
  51       * Suffix for inserted text.
  52       */
  53      var $_ins_suffix = '</ins>';
  54  
  55      /**
  56       * Prefix for deleted text.
  57       */
  58      var $_del_prefix = '<del>';
  59  
  60      /**
  61       * Suffix for deleted text.
  62       */
  63      var $_del_suffix = '</del>';
  64  
  65      /**
  66       * Header for each change block.
  67       */
  68      var $_block_header = '';
  69  
  70      /**
  71       * What are we currently splitting on? Used to recurse to show word-level
  72       * changes.
  73       */
  74      var $_split_level = 'lines';
  75  
  76      function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
  77      {
  78          return $this->_block_header;
  79      }
  80  
  81      function _startBlock($header)
  82      {
  83          return $header;
  84      }
  85  
  86      function _lines($lines, $prefix = ' ', $encode = true)
  87      {
  88          if ($encode) {
  89              array_walk($lines, array(&$this, '_encode'));
  90          }
  91  
  92          if ($this->_split_level == 'words') {
  93              return implode('', $lines);
  94          } else {
  95              return implode("\n", $lines) . "\n";
  96          }
  97      }
  98  
  99      function _added($lines)
 100      {
 101          array_walk($lines, array(&$this, '_encode'));
 102          $lines[0] = $this->_ins_prefix . $lines[0];
 103          $lines[count($lines) - 1] .= $this->_ins_suffix;
 104          return $this->_lines($lines, ' ', false);
 105      }
 106  
 107      function _deleted($lines, $words = false)
 108      {
 109          array_walk($lines, array(&$this, '_encode'));
 110          $lines[0] = $this->_del_prefix . $lines[0];
 111          $lines[count($lines) - 1] .= $this->_del_suffix;
 112          return $this->_lines($lines, ' ', false);
 113      }
 114  
 115      function _changed($orig, $final)
 116      {
 117          /* If we've already split on words, don't try to do so again - just
 118           * display. */
 119          if ($this->_split_level == 'words') {
 120              $prefix = '';
 121              while ($orig[0] !== false && $final[0] !== false &&
 122                     substr($orig[0], 0, 1) == ' ' &&
 123                     substr($final[0], 0, 1) == ' ') {
 124                  $prefix .= substr($orig[0], 0, 1);
 125                  $orig[0] = substr($orig[0], 1);
 126                  $final[0] = substr($final[0], 1);
 127              }
 128              return $prefix . $this->_deleted($orig) . $this->_added($final);
 129          }
 130  
 131          $text1 = implode("\n", $orig);
 132          $text2 = implode("\n", $final);
 133  
 134          /* Non-printing newline marker. */
 135          $nl = "\0";
 136  
 137          /* We want to split on word boundaries, but we need to
 138           * preserve whitespace as well. Therefore we split on words,
 139           * but include all blocks of whitespace in the wordlist. */
 140          $diff = new Text_Diff($this->_splitOnWords($text1, $nl),
 141                                $this->_splitOnWords($text2, $nl));
 142  
 143          /* Get the diff in inline format. */
 144          $renderer = new Text_Diff_Renderer_inline(array_merge($this->getParams(),
 145                                                                array('split_level' => 'words')));
 146  
 147          /* Run the diff and get the output. */
 148          return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
 149      }
 150  
 151      function _splitOnWords($string, $newlineEscape = "\n")
 152      {
 153          // Ignore \0; otherwise the while loop will never finish.
 154          $string = str_replace("\0", '', $string);
 155  
 156          $words = array();
 157          $length = strlen($string);
 158          $pos = 0;
 159  
 160          while ($pos < $length) {
 161              // Eat a word with any preceding whitespace.
 162              $spaces = strspn(substr($string, $pos), " \n");
 163              $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
 164              $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
 165              $pos += $spaces + $nextpos;
 166          }
 167  
 168          return $words;
 169      }
 170  
 171      function _encode(&$string)
 172      {
 173          $string = htmlspecialchars($string);
 174      }
 175  
 176  }