Text_Diff

18class Text_Diff {19 20    /**21     * Array of changes.22     *23     * @var array24     */25    var $_edits;26 27    /**28     * Computes diffs between sequences of strings.29     *30     * @param string $engine     Name of the diffing engine to use.  'auto'31     *                           will automatically select the best.32     * @param array $params      Parameters to pass to the diffing engine.33     *                           Normally an array of two arrays, each34     *                           containing the lines from a file.35     */36    function __construct( $engine, $params )37    {38        // Backward compatibility workaround.39        if (!is_string($engine)) {40            $params = array($engine, $params);41            $engine = 'auto';42        }43 44        if ($engine == 'auto') {45            $engine = extension_loaded('xdiff') ? 'xdiff' : 'native';46        } else {47            $engine = basename($engine);48        }49 50        // WP #739151        require_once dirname(__FILE__).'/Diff/Engine/' . $engine . '.php';52        $class = 'Text_Diff_Engine_' . $engine;53        $diff_engine = new $class();54 55        $this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params);56    }57 58	/**59	 * PHP4 constructor.60	 */61	public function Text_Diff( $engine, $params ) {62		self::__construct( $engine, $params );63	}64 65    /**66     * Returns the array of differences.67     */68    function getDiff()69    {70        return $this->_edits;71    }72 73    /**74     * returns the number of new (added) lines in a given diff.75     *76     * @since Text_Diff 1.1.077     *78     * @return int The number of new lines79     */80    function countAddedLines()81    {82        $count = 0;83        foreach ($this->_edits as $edit) {84            if (is_a($edit, 'Text_Diff_Op_add') ||85                is_a($edit, 'Text_Diff_Op_change')) {86                $count += $edit->nfinal();87            }88        }89        return $count;90    }91 92    /**93     * Returns the number of deleted (removed) lines in a given diff.94     *95     * @since Text_Diff 1.1.096     *97     * @return int The number of deleted lines