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242 lines
6.7 KiB
242 lines
6.7 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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* 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 __construct( $params = array() ) |
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{ |
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foreach ($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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* PHP4 constructor. |
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*/ |
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public function Text_Diff_Renderer( $params = array() ) { |
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self::__construct( $params ); |
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} |
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/** |
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* Get any renderer parameters. |
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* |
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* @return array All parameters of this renderer object. |
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*/ |
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function getParams() |
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{ |
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$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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