yiiapi/framework/gii/components/Pear/Text/Diff.php

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<?php
/**
 * General API for generating and formatting diffs - the differences between
 * two sequences of strings.
 *
 * The original PHP version of this code was written by Geoffrey T. Dairiki
 * <dairiki@dairiki.org>, and is used/adapted with his permission.
 *
 * $Horde: framework/Text_Diff/Diff.php,v 1.11.2.12 2009/01/06 15:23:41 jan Exp $
 *
 * Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org>
 * Copyright 2004-2009 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.
 *
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 */
class Text_Diff {

    /**
     * Array of changes.
     *
     * @var array
     */
    var $_edits;

    /**
     * Computes diffs between sequences of strings.
     *
     * @param string $engine     Name of the diffing engine to use.  'auto'
     *                           will automatically select the best.
     * @param array $params      Parameters to pass to the diffing engine.
     *                           Normally an array of two arrays, each
     *                           containing the lines from a file.
     */
    function __construct($engine, $params)
    {
        // Backward compatibility workaround.
        if (!is_string($engine)) {
            $params = array($engine, $params);
            $engine = 'auto';
        }

        if ($engine == 'auto') {
            $engine = extension_loaded('xdiff') ? 'xdiff' : 'native';
        } else {
            $engine = basename($engine);
        }

        require_once 'Text/Diff/Engine/' . $engine . '.php';
        $class = 'Text_Diff_Engine_' . $engine;
        $diff_engine = new $class();

        $this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params);
    }

    /**
     * Returns the array of differences.