lib/diff.php

   1 <?php // -*-php-*-
   2 // $Id$
   3 // diff.php
   4 //
   5 // PhpWiki diff output code.
   6 //
   7 // Copyright (C) 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org>
   8 // You may copy this code freely under the conditions of the GPL.
   9 //
  10
  11 require_once('lib/difflib.php');
  12
  13 class _HWLDF_WordAccumulator {
  14     function _HWLDF_WordAccumulator () {
  15         $this->_lines = array();
  16         $this->_line = false;
  17         $this->_group = false;
  18         $this->_tag = '~begin';
  19     }
  20
  21     function _flushGroup ($new_tag) {
  22         if ($this->_group !== false) {
  23             if (!$this->_line)
  24                 $this->_line = HTML();
  25             $this->_line->pushContent($this->_tag
  26                                       ? new HtmlElement($this->_tag,
  27                                                         $this->_group)
  28                                       : $this->_group);
  29         }
  30         $this->_group = '';
  31         $this->_tag = $new_tag;
  32     }
  33
  34     function _flushLine ($new_tag) {
  35         $this->_flushGroup($new_tag);
  36         if ($this->_line)
  37             $this->_lines[] = $this->_line;
  38         $this->_line = HTML();
  39     }
  40
  41     function addWords ($words, $tag = '') {
  42         if ($tag != $this->_tag)
  43             $this->_flushGroup($tag);
  44
  45         foreach ($words as $word) {
  46             // new-line should only come as first char of word.
  47             if ($word === "")
  48                 continue;
  49             if ($word[0] == "\n") {
  50                 $this->_group .= " ";
  51                 $this->_flushLine($tag);
  52                 $word = substr($word, 1);
  53             }
  54             assert(!strstr($word, "\n"));
  55             $this->_group .= $word;
  56         }
  57     }
  58
  59     function getLines() {
  60         $this->_flushLine('~done');
  61         return $this->_lines;
  62     }
  63 }
  64
  65 class WordLevelDiff extends MappedDiff
  66 {
  67     function WordLevelDiff ($orig_lines, $final_lines) {
  68         list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
  69         list ($final_words, $final_stripped) = $this->_split($final_lines);
  70
  71
  72         $this->MappedDiff($orig_words, $final_words,
  73                           $orig_stripped, $final_stripped);
  74     }
  75
  76     function _split($lines) {
  77         // FIXME: fix POSIX char class.
  78         if (!preg_match_all('/ ( [^\S\n]+ | [[:alnum:]]+ | . ) (?: (?!< \n) [^\S\n])? /xs',
  79                             implode("\n", $lines),
  80                             $m)) {
  81             return array(array(''), array(''));
  82         }
  83         return array($m[0], $m[1]);
  84     }
  85
  86     function orig () {
  87         $orig = new _HWLDF_WordAccumulator;
  88
  89         foreach ($this->edits as $edit) {
  90             if ($edit->type == 'copy')
  91                 $orig->addWords($edit->orig);
  92             elseif ($edit->orig)
  93                 $orig->addWords($edit->orig, 'del');
  94         }
  95         return $orig->getLines();
  96     }
  97
  98     function _final () {
  99         $final = new _HWLDF_WordAccumulator;
 100
 101         foreach ($this->edits as $edit) {
 102             if ($edit->type == 'copy')
 103                 $final->addWords($edit->final);
 104             elseif ($edit->final)
 105                 $final->addWords($edit->final, 'ins');
 106         }
 107         return $final->getLines();
 108     }
 109 }
 110
 111
 112 /**
 113  * HTML unified diff formatter.
 114  *
 115  * This class formats a diff into a CSS-based
 116  * unified diff format.
 117  *
 118  * Within groups of changed lines, diffs are highlit
 119  * at the character-diff level.
 120  */
 121 class HtmlUnifiedDiffFormatter extends UnifiedDiffFormatter
 122 {
 123     function HtmlUnifiedDiffFormatter($context_lines = 4) {
 124         $this->UnifiedDiffFormatter($context_lines);
 125     }
 126
 127     function _start_diff() {
 128         $this->_top = HTML::div(array('class' => 'diff'));
 129     }
 130     function _end_diff() {
 131         $val = $this->_top;
 132         unset($this->_top);
 133         return $val;
 134     }
 135
 136     function _start_block($header) {
 137         $this->_block = HTML::div(array('class' => 'block'),
 138                                   HTML::tt($header));
 139     }
 140
 141     function _end_block() {
 142         $this->_top->pushContent($this->_block);
 143         unset($this->_block);
 144     }
 145
 146     function _lines($lines, $class, $prefix = false, $elem = false) {
 147         if (!$prefix)
 148             $prefix = HTML::raw('&nbsp;');
 149         $div = HTML::div(array('class' => 'difftext'));
 150         foreach ($lines as $line) {
 151             if ($elem)
 152                 $line = new HtmlElement($elem, $line);
 153             $div->pushContent(HTML::div(array('class' => $class),
 154                                         HTML::tt(array('class' => 'prefix'),
 155                                                  $prefix),
 156                                         $line, HTML::raw('&nbsp;')));
 157         }
 158         $this->_block->pushContent($div);
 159     }
 160
 161     function _context($lines) {
 162         $this->_lines($lines, 'context');
 163     }
 164     function _deleted($lines) {
 165         $this->_lines($lines, 'deleted', '-', 'del');
 166     }
 167
 168     function _added($lines) {
 169         $this->_lines($lines, 'added', '+', 'ins');
 170     }
 171
 172     function _changed($orig, $final) {
 173         $diff = new WordLevelDiff($orig, $final);
 174         $this->_lines($diff->orig(), 'original', '-');
 175         $this->_lines($diff->_final(), 'final', '+');
 176     }
 177 }
 178
 179 /////////////////////////////////////////////////////////////////
 180
 181 function PageInfoRow ($label, $rev, &$request, $is_current = false)
 182 {
 183     global $WikiTheme;
 184
 185     $row = HTML::tr(HTML::td(array('align' => 'right'), $label));
 186     if ($rev) {
 187         $author = $rev->get('author');
 188         $dbi = $request->getDbh();
 189
 190         $iswikipage = (isWikiWord($author) && $dbi->isWikiPage($author));
 191         $authorlink = $iswikipage ? WikiLink($author) : $author;
 192         $version = $rev->getVersion();
 193         $linked_version = WikiLink($rev, 'existing', $version);
 194         if ($is_current)
 195             $revertbutton = HTML();
 196         else
 197             $revertbutton = $WikiTheme->makeActionButton(array('action' => 'revert',
 198                                                                'version' => $version),
 199                                                          false, $rev);
 200         $row->pushContent(HTML::td(fmt("version %s", $linked_version)),
 201                           HTML::td($WikiTheme->getLastModifiedMessage($rev,
 202                                                                       false)),
 203                           HTML::td(fmt("by %s", $authorlink)),
 204                           HTML::td($revertbutton)
 205                           );
 206     } else {
 207         $row->pushContent(HTML::td(array('colspan' => '4'), _("None")));
 208     }
 209     return $row;
 210 }
 211
 212 function showDiff (&$request) {
 213     $pagename = $request->getArg('pagename');
 214     if (is_array($versions = $request->getArg('versions'))) {
 215         // Version selection from pageinfo.php display:
 216         rsort($versions);
 217         list ($version, $previous) = $versions;
 218     }
 219     else {
 220         $version = $request->getArg('version');
 221         $previous = $request->getArg('previous');
 222     }
 223
 224     // abort if page doesn't exist
 225     $dbi = $request->getDbh();
 226     $page = $request->getPage();
 227     $current = $page->getCurrentRevision(false);
 228     if ($current->getVersion() < 1) {
 229         $html = HTML::div(array('class'=>'wikitext','id'=>'difftext'),
 230                           HTML::p(fmt("I'm sorry, there is no such page as %s.",
 231                                       WikiLink($pagename, 'unknown'))));
 232         require_once('lib/Template.php');
 233         GeneratePage($html, sprintf(_("Diff: %s"), $pagename), false);
 234         return; //early return
 235     }
 236
 237     if ($version) {
 238         if (!($new = $page->getRevision($version)))
 239             NoSuchRevision($request, $page, $version);
 240         $new_version = fmt("version %d", $version);
 241     }
 242     else {
 243         $new = $current;
 244         $new_version = _("current version");
 245     }
 246
 247     if (preg_match('/^\d+$/', $previous)) {
 248         if ( !($old = $page->getRevision($previous)) )
 249             NoSuchRevision($request, $page, $previous);
 250         $old_version = fmt("version %d", $previous);
 251         $others = array('major', 'minor', 'author');
 252     }
 253     else {
 254         switch ($previous) {
 255         case 'author':
 256             $old = $new;
 257             while ($old = $page->getRevisionBefore($old)) {
 258                 if ($old->get('author') != $new->get('author'))
 259                     break;
 260             }
 261             $old_version = _("revision by previous author");
 262             $others = array('major', 'minor');
 263             break;
 264         case 'minor':
 265             $previous='minor';
 266             $old = $page->getRevisionBefore($new);
 267             $old_version = _("previous revision");
 268             $others = array('major', 'author');
 269             break;
 270         case 'major':
 271         default:
 272             $old = $new;
 273             while ($old && $old->get('is_minor_edit'))
 274                 $old = $page->getRevisionBefore($old);
 275             if ($old)
 276                 $old = $page->getRevisionBefore($old);
 277             $old_version = _("predecessor to the previous major change");
 278             $others = array('minor', 'author');
 279             break;
 280         }
 281     }
 282
 283     $new_link = WikiLink($new, '', $new_version);
 284     $old_link = $old ? WikiLink($old, '', $old_version) : $old_version;
 285     $page_link = WikiLink($page);
 286
 287     $html = HTML::div(array('class'=>'wikitext','id'=>'difftext'),
 288                      HTML::p(fmt("Differences between %s and %s of %s.",
 289                                  $new_link, $old_link, $page_link)));
 290
 291     $otherdiffs = HTML::p(_("Other diffs:"));
 292     $label = array('major' => _("Previous Major Revision"),
 293                    'minor' => _("Previous Revision"),
 294                    'author'=> _("Previous Author"));
 295     foreach ($others as $other) {
 296         $args = array('action' => 'diff', 'previous' => $other);
 297         if ($version)
 298             $args['version'] = $version;
 299         if (count($otherdiffs->getContent()) > 1)
 300             $otherdiffs->pushContent(", ");
 301         else
 302             $otherdiffs->pushContent(" ");
 303         $otherdiffs->pushContent(Button($args, $label[$other]));
 304     }
 305     $html->pushContent($otherdiffs);
 306
 307     if ($old and $old->getVersion() == 0)
 308         $old = false;
 309
 310     $html->pushContent(HTML::Table(PageInfoRow(_("Newer page:"), $new,
 311                                                $request, empty($version)),
 312                                    PageInfoRow(_("Older page:"), $old,
 313                                                $request, false)));
 314
 315     if ($new && $old) {
 316         $diff = new Diff($old->getContent(), $new->getContent());
 317
 318         if ($diff->isEmpty()) {
 319             $html->pushContent(HTML::hr(),
 320                                HTML::p(sprintf(_("Content of versions %1$s and %2$s is identical."),
 321                                                $old->getVersion(),
 322                                                $new->getVersion())));
 323             // If two consecutive versions have the same content, it is because the page was
 324             // renamed, or metadata changed: ACL, owner, markup.
 325             // We give the reason by printing the summary.
 326             if (($new->getVersion() - $old->getVersion()) == 1) {
 327                 $html->pushContent(HTML::p(sprintf(_("Version %1$s was created because: %2$s"),
 328                                                    $new->getVersion(),
 329                                                    $new->get('summary'))));
 330             }
 331         } else {
 332             $fmt = new HtmlUnifiedDiffFormatter;
 333             $html->pushContent($fmt->format($diff));
 334         }
 335
 336         $html->pushContent(HTML::hr(), HTML::h2($new_version));
 337         require_once("lib/BlockParser.php");
 338         $html->pushContent(TransformText($new,$new->get('markup'),$pagename));
 339     }
 340
 341     require_once('lib/Template.php');
 342     GeneratePage($html, sprintf(_("Diff: %s"), $pagename), $new);
 343 }
 344
 345 // Local Variables:
 346 // mode: php
 347 // tab-width: 8
 348 // c-basic-offset: 4
 349 // c-hanging-comment-ender-p: nil
 350 // indent-tabs-mode: nil
 351 // End:
 352 ?>