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208 lines
5.3 KiB
208 lines
5.3 KiB
<?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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* $Horde: framework/Text_Diff/Diff/Renderer.php,v 1.5 2004/10/13 09:30:20 jan Exp $
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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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/**
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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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protected $_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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protected $_trailing_context_lines = 0;
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/**
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* Constructor.
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*/
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public function __construct($params = [])
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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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* Renders a diff.
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*
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* @param Text_Diff $diff A Text_Diff object.
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*
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* @return string The formatted output.
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*/
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public function render($diff)
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{
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$xi = $yi = 1;
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$block = false;
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$context = [];
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$nlead = $this->_leading_context_lines;
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$ntrail = $this->_trailing_context_lines;
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$this->_startDiff();
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foreach ($diff->getDiff() as $edit) {
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if (is_a($edit, 'Text_Diff_Op_copy')) {
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if (is_array($block)) {
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if (count($edit->orig) <= $nlead + $ntrail) {
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$block[] = $edit;
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} else {
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if ($ntrail) {
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$context = array_slice($edit->orig, 0, $ntrail);
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$block[] = new Text_Diff_Op_copy($context);
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}
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$this->_block(
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$x0,
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$ntrail + $xi - $x0,
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$y0,
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$ntrail + $yi - $y0,
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$block
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);
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$block = false;
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}
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}
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$context = $edit->orig;
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} else {
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if (! is_array($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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$block = [];
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if ($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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$this->_block(
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$x0,
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$xi - $x0,
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$y0,
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$yi - $y0,
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$block
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);
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}
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return $this->_endDiff();
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}
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protected function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)
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{
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$this->_startBlock($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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$this->_context($edit->orig);
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break;
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case 'text_diff_op_add':
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$this->_added($edit->final);
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break;
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case 'text_diff_op_delete':
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$this->_deleted($edit->orig);
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break;
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case 'text_diff_op_change':
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$this->_changed($edit->orig, $edit->final);
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break;
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default:
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trigger_error("Unknown edit type", E_USER_ERROR);
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}
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$this->_endBlock();
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}
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}
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protected function _startDiff()
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{
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ob_start();
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}
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protected function _endDiff()
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{
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$val = ob_get_contents();
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ob_end_clean();
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return $val;
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}
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protected function _blockHeader($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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return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
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}
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protected function _startBlock($header)
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{
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// TODO: What's this output for? It breaks XML pages
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// echo $header . "\n";
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}
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protected function _endBlock()
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{
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}
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protected function _lines($lines, $prefix = '', $suffix = '', $type = '')
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{
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foreach ($lines as $line) {
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echo "$prefix$line$suffix\n";
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}
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}
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protected function _context($lines)
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{
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$this->_lines($lines, ' ');
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}
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protected function _added($lines)
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{
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$this->_lines($lines, '>');
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}
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protected function _deleted($lines)
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{
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$this->_lines($lines, '<');
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}
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protected function _changed($orig, $final)
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{
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$this->_deleted($orig);
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echo "---\n";
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$this->_added($final);
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}
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}
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