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   1  <?php
   2  /**
   3   * $Horde: framework/Text_Diff/Diff/Mapped.php,v 1.3.2.3 2008/01/04 10:37:27 jan Exp $
   4   *
   5   * Copyright 2007-2008 The Horde Project (http://www.horde.org/)
   6   *
   7   * See the enclosed file COPYING for license information (LGPL). If you did
   8   * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
   9   *
  10   * @package Text_Diff
  11   * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
  12   */
  13  class Text_Diff_Mapped extends Text_Diff {
  14  
  15      /**
  16       * Computes a diff between sequences of strings.
  17       *
  18       * This can be used to compute things like case-insensitve diffs, or diffs
  19       * which ignore changes in white-space.
  20       *
  21       * @param array $from_lines         An array of strings.
  22       * @param array $to_lines           An array of strings.
  23       * @param array $mapped_from_lines  This array should have the same size
  24       *                                  number of elements as $from_lines.  The
  25       *                                  elements in $mapped_from_lines and
  26       *                                  $mapped_to_lines are what is actually
  27       *                                  compared when computing the diff.
  28       * @param array $mapped_to_lines    This array should have the same number
  29       *                                  of elements as $to_lines.
  30       */
  31      function Text_Diff_Mapped($from_lines, $to_lines,
  32                                $mapped_from_lines, $mapped_to_lines)
  33      {
  34          assert(count($from_lines) == count($mapped_from_lines));
  35          assert(count($to_lines) == count($mapped_to_lines));
  36  
  37          parent::Text_Diff($mapped_from_lines, $mapped_to_lines);
  38  
  39          $xi = $yi = 0;
  40          for ($i = 0; $i < count($this->_edits); $i++) {
  41              $orig = &$this->_edits[$i]->orig;
  42              if (is_array($orig)) {
  43                  $orig = array_slice($from_lines, $xi, count($orig));
  44                  $xi += count($orig);
  45              }
  46  
  47              $final = &$this->_edits[$i]->final;
  48              if (is_array($final)) {
  49                  $final = array_slice($to_lines, $yi, count($final));
  50                  $yi += count($final);
  51              }
  52          }
  53      }
  54  
  55  }