Text_Diff_Renderer

15class Text_Diff_Renderer {16 17    /**18     * Number of leading context "lines" to preserve.19     *20     * This should be left at zero for this class, but subclasses may want to21     * set this to other values.22     */23    var $_leading_context_lines = 0;24 25    /**26     * Number of trailing context "lines" to preserve.27     *28     * This should be left at zero for this class, but subclasses may want to29     * set this to other values.30     */31    var $_trailing_context_lines = 0;32 33    /**34     * Constructor.35     */36    function __construct( $params = array() )37    {38        foreach ($params as $param => $value) {39            $v = '_' . $param;40            if (isset($this->$v)) {41                $this->$v = $value;42            }43        }44    }45 46	/**47	 * PHP4 constructor.48	 */49	public function Text_Diff_Renderer( $params = array() ) {50		self::__construct( $params );51	}52 53    /**54     * Get any renderer parameters.55     *56     * @return array  All parameters of this renderer object.57     */58    function getParams()59    {60        $params = array();61        foreach (get_object_vars($this) as $k => $v) {62            if ($k[0] == '_') {63                $params[substr($k, 1)] = $v;64            }65        }66 67        return $params;68    }69 70    /**71     * Renders a diff.72     *73     * @param Text_Diff $diff  A Text_Diff object.74     *75     * @return string  The formatted output.76     */77    function render($diff)78    {79        $xi = $yi = 1;80        $block = false;81        $context = array();82 83        $nlead = $this->_leading_context_lines;84        $ntrail = $this->_trailing_context_lines;85 86        $output = $this->_startDiff();87 88        $diffs = $diff->getDiff();89        foreach ($diffs as $i => $edit) {90            /* If these are unchanged (copied) lines, and we want to keep91             * leading or trailing context lines, extract them from the copy92             * block. */93            if (is_a($edit, 'Text_Diff_Op_copy')) {94                /* Do we have any diff blocks yet? */