<?php

/**

 * "Unified" diff renderer.

 *

 * This class renders the diff in classic "unified diff" format.

 *

 * $Horde: framework/Text_Diff/Diff/Renderer/unified.php,v 1.5 2006/01/08 00:06:57 jan Exp $

 *

 * @package Text_Diff

 */

class Text_Diff_Renderer_unified extends Text_Diff_Renderer {

    /**

     * Number of leading context "lines" to preserve.

     */

    var $_leading_context_lines = 4;

    /**

     * Number of trailing context "lines" to preserve.

     */

    var $_trailing_context_lines = 4;

    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)

    {

        if ($xlen != 1) {

            $xbeg .= ',' . $xlen;

        }

        if ($ylen != 1) {

            $ybeg .= ',' . $ylen;

        }

        return "@@ -$xbeg +$ybeg @@";

    }

    function _added($lines)

    {

        return $this->_lines($lines, '+');

    }

    function _deleted($lines)

    {

        return $this->_lines($lines, '-');

    }

    function _changed($orig, $final)

    {

        return $this->_deleted($orig) . $this->_added($final);

    }

}