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git-svn-id: http://svn.automattic.com/wordpress/trunk@13211 1a063a9b-81f0-0310-95a4-ce76da25c4cd
236 lines
6.5 KiB
PHP
236 lines
6.5 KiB
PHP
<?php
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/**
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* A class to render Diffs in different formats.
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*
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* This class renders the diff in classic diff format. It is intended that
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* this class be customized via inheritance, to obtain fancier outputs.
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*
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* Copyright 2004-2010 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you did
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* not receive this file, see http://opensource.org/licenses/lgpl-license.php.
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*
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* @package Text_Diff
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*/
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class Text_Diff_Renderer {
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/**
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* Number of leading context "lines" to preserve.
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*
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* This should be left at zero for this class, but subclasses may want to
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* set this to other values.
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*/
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var $_leading_context_lines = 0;
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/**
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* Number of trailing context "lines" to preserve.
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*
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* This should be left at zero for this class, but subclasses may want to
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* set this to other values.
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*/
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var $_trailing_context_lines = 0;
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/**
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* Constructor.
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*/
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function Text_Diff_Renderer($params = array())
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{
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foreach ($params as $param => $value) {
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$v = '_' . $param;
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if (isset($this->$v)) {
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$this->$v = $value;
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}
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}
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}
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/**
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* Get any renderer parameters.
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*
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* @return array All parameters of this renderer object.
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*/
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function getParams()
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{
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$params = array();
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foreach (get_object_vars($this) as $k => $v) {
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if ($k[0] == '_') {
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$params[substr($k, 1)] = $v;
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}
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}
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return $params;
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}
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/**
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* Renders a diff.
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*
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* @param Text_Diff $diff A Text_Diff object.
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*
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* @return string The formatted output.
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*/
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function render($diff)
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{
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$xi = $yi = 1;
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$block = false;
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$context = array();
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$nlead = $this->_leading_context_lines;
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$ntrail = $this->_trailing_context_lines;
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$output = $this->_startDiff();
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$diffs = $diff->getDiff();
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foreach ($diffs as $i => $edit) {
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/* If these are unchanged (copied) lines, and we want to keep
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* leading or trailing context lines, extract them from the copy
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* block. */
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if (is_a($edit, 'Text_Diff_Op_copy')) {
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/* Do we have any diff blocks yet? */
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if (is_array($block)) {
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/* How many lines to keep as context from the copy
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* block. */
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$keep = $i == count($diffs) - 1 ? $ntrail : $nlead + $ntrail;
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if (count($edit->orig) <= $keep) {
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/* We have less lines in the block than we want for
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* context => keep the whole block. */
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$block[] = $edit;
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} else {
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if ($ntrail) {
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/* Create a new block with as many lines as we need
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* for the trailing context. */
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$context = array_slice($edit->orig, 0, $ntrail);
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$block[] = &new Text_Diff_Op_copy($context);
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}
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/* @todo */
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$output .= $this->_block($x0, $ntrail + $xi - $x0,
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$y0, $ntrail + $yi - $y0,
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$block);
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$block = false;
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}
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}
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/* Keep the copy block as the context for the next block. */
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$context = $edit->orig;
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} else {
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/* Don't we have any diff blocks yet? */
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if (!is_array($block)) {
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/* Extract context lines from the preceding copy block. */
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$context = array_slice($context, count($context) - $nlead);
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$x0 = $xi - count($context);
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$y0 = $yi - count($context);
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$block = array();
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if ($context) {
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$block[] = &new Text_Diff_Op_copy($context);
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}
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}
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$block[] = $edit;
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}
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if ($edit->orig) {
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$xi += count($edit->orig);
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}
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if ($edit->final) {
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$yi += count($edit->final);
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}
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}
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if (is_array($block)) {
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$output .= $this->_block($x0, $xi - $x0,
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$y0, $yi - $y0,
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$block);
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}
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return $output . $this->_endDiff();
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}
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function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)
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{
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$output = $this->_startBlock($this->_blockHeader($xbeg, $xlen, $ybeg, $ylen));
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foreach ($edits as $edit) {
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switch (strtolower(get_class($edit))) {
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case 'text_diff_op_copy':
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$output .= $this->_context($edit->orig);
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break;
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case 'text_diff_op_add':
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$output .= $this->_added($edit->final);
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break;
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case 'text_diff_op_delete':
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$output .= $this->_deleted($edit->orig);
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break;
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case 'text_diff_op_change':
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$output .= $this->_changed($edit->orig, $edit->final);
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break;
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}
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}
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return $output . $this->_endBlock();
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}
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function _startDiff()
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{
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return '';
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}
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function _endDiff()
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{
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return '';
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}
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function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
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{
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if ($xlen > 1) {
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$xbeg .= ',' . ($xbeg + $xlen - 1);
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}
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if ($ylen > 1) {
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$ybeg .= ',' . ($ybeg + $ylen - 1);
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}
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// this matches the GNU Diff behaviour
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if ($xlen && !$ylen) {
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$ybeg--;
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} elseif (!$xlen) {
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$xbeg--;
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}
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return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
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}
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function _startBlock($header)
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{
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return $header . "\n";
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}
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function _endBlock()
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{
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return '';
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}
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function _lines($lines, $prefix = ' ')
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{
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return $prefix . implode("\n$prefix", $lines) . "\n";
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}
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function _context($lines)
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{
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return $this->_lines($lines, ' ');
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}
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function _added($lines)
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{
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return $this->_lines($lines, '> ');
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}
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function _deleted($lines)
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{
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return $this->_lines($lines, '< ');
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}
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function _changed($orig, $final)
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{
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return $this->_deleted($orig) . "---\n" . $this->_added($final);
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}
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}
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