348 lines
13 KiB
PHP
348 lines
13 KiB
PHP
<?php
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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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# ***** BEGIN LICENSE BLOCK *****
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# This file is part of InDefero, an open source project management application.
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# Copyright (C) 2008 Céondo Ltd and contributors.
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#
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# InDefero is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# InDefero is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ***** END LICENSE BLOCK ***** */
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/**
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* Diff parser.
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*
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*/
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class IDF_Diff
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{
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public $path_strip_level = 0;
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protected $lines = array();
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public $files = array();
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public function __construct($diff, $path_strip_level = 0)
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{
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$this->path_strip_level = $path_strip_level;
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// this works because in unified diff format even empty lines are
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// either prefixed with a '+', '-' or ' '
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$this->lines = preg_split("/\015\012|\015|\012/", $diff, -1, PREG_SPLIT_NO_EMPTY);
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}
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public function parse()
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{
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$current_file = '';
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$current_chunk = 0;
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$lline = 0;
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$rline = 0;
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$files = array();
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$indiff = false; // Used to skip the headers in the git patches
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$i = 0; // Used to skip the end of a git patch with --\nversion number
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$diffsize = count($this->lines);
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while ($i < $diffsize) {
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// look for the potential beginning of a diff
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if (substr($this->lines[$i], 0, 4) !== '--- ') {
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$i++;
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continue;
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}
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// we're inside a diff candiate
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$oldfileline = $this->lines[$i++];
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$newfileline = $this->lines[$i++];
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if (substr($newfileline, 0, 4) !== '+++ ') {
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// not a valid diff here, move on
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continue;
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}
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// use new file name by default
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preg_match("/^\+\+\+ ([^\t]+)/", $newfileline, $m);
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$current_file = $m[1];
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if ($current_file === '/dev/null') {
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// except if it's /dev/null, use the old one instead
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// eg. mtn 0.48 and newer
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preg_match("/^--- ([^\t]+)/", $oldfileline, $m);
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$current_file = $m[1];
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}
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if ($this->path_strip_level > 0) {
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$fileparts = explode('/', $current_file, $this->path_strip_level+1);
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$current_file = array_pop($fileparts);
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}
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$current_chunk = 0;
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$files[$current_file] = array();
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$files[$current_file]['chunks'] = array();
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$files[$current_file]['chunks_def'] = array();
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while ($i < $diffsize && substr($this->lines[$i], 0, 3) === '@@ ') {
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$elems = preg_match('/@@ -(\d+),?(\d*) \+(\d+),?(\d*) @@.*/',
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$this->lines[$i++], $results);
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if ($elems != 1) {
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// hunk is badly formatted
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break;
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}
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$delstart = $results[1];
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$dellines = $results[2] === '' ? 1 : $results[2];
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$addstart = $results[3];
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$addlines = $results[4] === '' ? 1 : $results[4];
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$files[$current_file]['chunks_def'][] = array(
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array($delstart, $dellines), array($addstart, $addlines)
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);
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$files[$current_file]['chunks'][] = array();
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while ($i < $diffsize && ($addlines >= 0 || $dellines >= 0)) {
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$linetype = $this->lines[$i] != '' ? $this->lines[$i][0] : ' ';
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switch ($linetype) {
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case ' ':
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$files[$current_file]['chunks'][$current_chunk][] =
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array($delstart, $addstart, substr($this->lines[$i++], 1));
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$dellines--;
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$addlines--;
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$delstart++;
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$addstart++;
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break;
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case '+':
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$files[$current_file]['chunks'][$current_chunk][] =
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array('', $addstart, substr($this->lines[$i++], 1));
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$addlines--;
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$addstart++;
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break;
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case '-':
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$files[$current_file]['chunks'][$current_chunk][] =
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array($delstart, '', substr($this->lines[$i++], 1));
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$dellines--;
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$delstart++;
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break;
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case '\\':
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// ignore newline handling for now, see issue 636
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$i++;
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continue;
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default:
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break 2;
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}
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}
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$current_chunk++;
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}
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}
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$this->files = $files;
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return $files;
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}
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/**
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* Return the html version of a parsed diff.
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*/
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public function as_html()
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{
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$out = '';
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foreach ($this->files as $filename=>$file) {
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$pretty = '';
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$fileinfo = IDF_FileUtil::getMimeType($filename);
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if (IDF_FileUtil::isSupportedExtension($fileinfo[2])) {
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$pretty = ' prettyprint';
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}
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$out .= "\n".'<table class="diff" summary="">'."\n";
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$out .= '<tr id="diff-'.md5($filename).'"><th colspan="3">'.Pluf_esc($filename).'</th></tr>'."\n";
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$cc = 1;
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foreach ($file['chunks'] as $chunk) {
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foreach ($chunk as $line) {
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if ($line[0] and $line[1]) {
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$class = 'diff-c';
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} elseif ($line[0]) {
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$class = 'diff-r';
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} else {
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$class = 'diff-a';
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}
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$line_content = self::padLine(Pluf_esc($line[2]));
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$out .= sprintf('<tr class="diff-line"><td class="diff-lc">%s</td><td class="diff-lc">%s</td><td class="%s%s mono">%s</td></tr>'."\n", $line[0], $line[1], $class, $pretty, $line_content);
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}
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if (count($file['chunks']) > $cc)
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$out .= '<tr class="diff-next"><td>...</td><td>...</td><td> </td></tr>'."\n";
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$cc++;
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}
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$out .= '</table>';
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}
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return Pluf_Template::markSafe($out);
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}
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public static function padLine($line)
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{
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$line = str_replace("\t", ' ', $line);
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$n = strlen($line);
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for ($i=0;$i<$n;$i++) {
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if (substr($line, $i, 1) != ' ') {
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break;
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}
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}
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return str_repeat(' ', $i).substr($line, $i);
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}
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/**
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* Review patch.
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*
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* Given the original file as a string and the parsed
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* corresponding diff chunks, generate a side by side view of the
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* original file and new file with added/removed lines.
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*
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* Example of use:
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*
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* $diff = new IDF_Diff(file_get_contents($diff_file));
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* $orig = file_get_contents($orig_file);
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* $diff->parse();
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* echo $diff->fileCompare($orig, $diff->files[$orig_file], $diff_file);
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*
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* @param string Original file
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* @param array Chunk description of the diff corresponding to the file
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* @param string Original file name
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* @param int Number of lines before/after the chunk to be displayed (10)
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* @return Pluf_Template_SafeString The table body
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*/
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public function fileCompare($orig, $chunks, $filename, $context=10)
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{
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$orig_lines = preg_split("/\015\012|\015|\012/", $orig);
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$new_chunks = $this->mergeChunks($orig_lines, $chunks, $context);
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return $this->renderCompared($new_chunks, $filename);
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}
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public function mergeChunks($orig_lines, $chunks, $context=10)
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{
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$spans = array();
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$new_chunks = array();
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$min_line = 0;
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$max_line = 0;
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//if (count($chunks['chunks_def']) == 0) return '';
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foreach ($chunks['chunks_def'] as $chunk) {
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$start = ($chunk[0][0] > $context) ? $chunk[0][0]-$context : 0;
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$end = (($chunk[0][0]+$chunk[0][1]+$context-1) < count($orig_lines)) ? $chunk[0][0]+$chunk[0][1]+$context-1 : count($orig_lines);
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$spans[] = array($start, $end);
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}
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// merge chunks/get the chunk lines
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// these are reference lines
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$chunk_lines = array();
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foreach ($chunks['chunks'] as $chunk) {
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foreach ($chunk as $line) {
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$chunk_lines[] = $line;
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}
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}
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$i = 0;
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foreach ($chunks['chunks'] as $chunk) {
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$n_chunk = array();
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// add lines before
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if ($chunk[0][0] > $spans[$i][0]) {
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for ($lc=$spans[$i][0];$lc<$chunk[0][0];$lc++) {
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$exists = false;
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foreach ($chunk_lines as $line) {
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if ($lc == $line[0]
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or ($chunk[0][1]-$chunk[0][0]+$lc) == $line[1]) {
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$exists = true;
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break;
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}
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}
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if (!$exists) {
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$orig = isset($orig_lines[$lc-1]) ? $orig_lines[$lc-1] : '';
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$n_chunk[] = array(
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$lc,
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$chunk[0][1]-$chunk[0][0]+$lc,
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$orig
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);
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}
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}
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}
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// add chunk lines
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foreach ($chunk as $line) {
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$n_chunk[] = $line;
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}
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// add lines after
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$lline = $line;
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if (!empty($lline[0]) and $lline[0] < $spans[$i][1]) {
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for ($lc=$lline[0];$lc<=$spans[$i][1];$lc++) {
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$exists = false;
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foreach ($chunk_lines as $line) {
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if ($lc == $line[0] or ($lline[1]-$lline[0]+$lc) == $line[1]) {
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$exists = true;
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break;
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}
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}
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if (!$exists) {
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$n_chunk[] = array(
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$lc,
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$lline[1]-$lline[0]+$lc,
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$orig_lines[$lc-1]
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);
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}
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}
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}
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$new_chunks[] = $n_chunk;
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$i++;
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}
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// Now, each chunk has the right length, we need to merge them
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// when needed
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$nnew_chunks = array();
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$i = 0;
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foreach ($new_chunks as $chunk) {
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if ($i>0) {
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$lline = end($nnew_chunks[$i-1]);
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if ($chunk[0][0] <= $lline[0]+1) {
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// need merging
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foreach ($chunk as $line) {
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if ($line[0] > $lline[0] or empty($line[0])) {
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$nnew_chunks[$i-1][] = $line;
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}
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}
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} else {
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$nnew_chunks[] = $chunk;
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$i++;
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}
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} else {
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$nnew_chunks[] = $chunk;
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$i++;
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}
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}
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return $nnew_chunks;
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}
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public function renderCompared($chunks, $filename)
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{
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$fileinfo = IDF_FileUtil::getMimeType($filename);
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$pretty = '';
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if (IDF_FileUtil::isSupportedExtension($fileinfo[2])) {
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$pretty = ' prettyprint';
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}
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$out = '';
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$cc = 1;
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$i = 0;
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foreach ($chunks as $chunk) {
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foreach ($chunk as $line) {
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$line1 = ' ';
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$line2 = ' ';
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$line[2] = (strlen($line[2])) ? self::padLine(Pluf_esc($line[2])) : ' ';
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if ($line[0] and $line[1]) {
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$class = 'diff-c';
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$line1 = $line2 = $line[2];
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} elseif ($line[0]) {
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$class = 'diff-r';
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$line1 = $line[2];
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} else {
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$class = 'diff-a';
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$line2 = $line[2];
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}
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$out .= sprintf('<tr class="diff-line"><td class="diff-lc">%s</td><td class="%s mono%s"><code>%s</code></td><td class="diff-lc">%s</td><td class="%s mono%s"><code>%s</code></td></tr>'."\n", $line[0], $class, $pretty, $line1, $line[1], $class, $pretty, $line2);
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}
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if (count($chunks) > $cc)
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$out .= '<tr class="diff-next"><td>...</td><td> </td><td>...</td><td> </td></tr>'."\n";
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$cc++;
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$i++;
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}
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return Pluf_Template::markSafe($out);
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}
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}
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