lib/diff.php

   1 <?php // -*-php-*-
   2 // rcs_id('$Id$');
   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 require_once('lib/HtmlElement.php');
  13
  14 class _HWLDF_WordAccumulator {
  15     function _HWLDF_WordAccumulator () {
  16         $this->_lines = array();
  17         $this->_line = false;
  18         $this->_group = false;
  19         $this->_tag = '~begin';
  20     }
  21
  22     function _flushGroup ($new_tag) {
  23         if ($this->_group !== false) {
  24             if (!$this->_line)
  25                 $this->_line = HTML();
  26             $this->_line->pushContent($this->_tag
  27                                       ? new HtmlElement($this->_tag,
  28                                                         $this->_group)
  29                                       : $this->_group);
  30         }
  31         $this->_group = '';
  32         $this->_tag = $new_tag;
  33     }
  34
  35     function _flushLine ($new_tag) {
  36         $this->_flushGroup($new_tag);
  37         if ($this->_line)
  38             $this->_lines[] = $this->_line;
  39         $this->_line = HTML();
  40     }
  41
  42     function addWords ($words, $tag = '') {
  43         if ($tag != $this->_tag)
  44             $this->_flushGroup($tag);
  45
  46         foreach ($words as $word) {
  47             // new-line should only come as first char of word.
  48             if ($word === "")
  49                 continue;
  50             if ($word[0] == "\n") {
  51                 $this->_group .= " ";
  52                 $this->_flushLine($tag);
  53                 $word = substr($word, 1);
  54             }
  55             assert(!strstr($word, "\n"));
  56             $this->_group .= $word;
  57         }
  58     }
  59
  60     function getLines() {
  61         $this->_flushLine('~done');
  62         return $this->_lines;
  63     }
  64 }
  65
  66 class WordLevelDiff extends MappedDiff
  67 {
  68     function WordLevelDiff ($orig_lines, $final_lines) {
  69         list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
  70         list ($final_words, $final_stripped) = $this->_split($final_lines);
  71
  72
  73         $this->MappedDiff($orig_words, $final_words,
  74                           $orig_stripped, $final_stripped);
  75     }
  76
  77     function _split($lines) {
  78         // FIXME: fix POSIX char class.
  79         if (!preg_match_all('/ ( [^\S\n]+ | [[:alnum:]]+ | . ) (?: (?!< \n) [^\S\n])? /xs',
  80                             implode("\n", $lines),
  81                             $m)) {
  82             return array(array(''), array(''));
  83         }
  84         return array($m[0], $m[1]);
  85     }
  86
  87     function orig () {
  88         $orig = new _HWLDF_WordAccumulator;
  89
  90         foreach ($this->edits as $edit) {
  91             if ($edit->type == 'copy')
  92                 $orig->addWords($edit->orig);
  93             elseif ($edit->orig)
  94                 $orig->addWords($edit->orig, 'del');
  95         }
  96         return $orig->getLines();
  97     }
  98
  99     function _final () {
 100         $final = new _HWLDF_WordAccumulator;
 101
 102         foreach ($this->edits as $edit) {
 103             if ($edit->type == 'copy')
 104                 $final->addWords($edit->final);
 105             elseif ($edit->final)
 106                 $final->addWords($edit->final, 'ins');
 107         }
 108         return $final->getLines();
 109     }
 110 }
 111
 112
 113 /**
 114  * HTML unified diff formatter.
 115  *
 116  * This class formats a diff into a CSS-based
 117  * unified diff format.
 118  *
 119  * Within groups of changed lines, diffs are highlit
 120  * at the character-diff level.
 121  */
 122 class HtmlUnifiedDiffFormatter extends UnifiedDiffFormatter
 123 {
 124     function HtmlUnifiedDiffFormatter($context_lines = 4) {
 125         $this->UnifiedDiffFormatter($context_lines);
 126     }
 127
 128     function _start_diff() {
 129         $this->_top = HTML::div(array('class' => 'diff'));
 130     }
 131     function _end_diff() {
 132         $val = $this->_top;
 133         unset($this->_top);
 134         return $val;
 135     }
 136
 137     function _start_block($header) {
 138         $this->_block = HTML::div(array('class' => 'block'),
 139                                   HTML::tt($header));
 140     }
 141
 142     function _end_block() {
 143         $this->_top->pushContent($this->_block);
 144         unset($this->_block);
 145     }
 146
 147     function _lines($lines, $class, $prefix = false, $elem = false) {
 148         if (!$prefix)
 149             $prefix = HTML::raw('&nbsp;');
 150         $div = HTML::div(array('class' => 'difftext'));
 151         foreach ($lines as $line) {
 152             if ($elem)
 153                 $line = new HtmlElement($elem, $line);
 154             $div->pushContent(HTML::div(array('class' => $class),
 155                                         HTML::tt(array('class' => 'prefix'),
 156                                                  $prefix),
 157                                         $line, HTML::raw('&nbsp;')));
 158         }
 159         $this->_block->pushContent($div);
 160     }
 161
 162     function _context($lines) {
 163         $this->_lines($lines, 'context');
 164     }
 165     function _deleted($lines) {
 166         $this->_lines($lines, 'deleted', '-', 'del');
 167     }
 168
 169     function _added($lines) {
 170         $this->_lines($lines, 'added', '+', 'ins');
 171     }
 172
 173     function _changed($orig, $final) {
 174         $diff = new WordLevelDiff($orig, $final);
 175         $this->_lines($diff->orig(), 'original', '-');
 176         $this->_lines($diff->_final(), 'final', '+');
 177     }
 178 }
 179
 180 /**
 181  * HTML table-based unified diff formatter.
 182  *
 183  * This class formats a diff into a table-based
 184  * unified diff format.  (Similar to what was produced
 185  * by previous versions of PhpWiki.)
 186  *
 187  * Within groups of changed lines, diffs are highlit
 188  * at the character-diff level.
 189  */
 190 class TableUnifiedDiffFormatter extends HtmlUnifiedDiffFormatter
 191 {
 192     function TableUnifiedDiffFormatter($context_lines = 4) {
 193         $this->HtmlUnifiedDiffFormatter($context_lines);
 194     }
 195
 196     function _start_diff() {
 197         $this->_top = HTML::table(array('width' => '100%',
 198                                         'class' => 'diff',
 199                                         'cellspacing' => 1,
 200                                         'cellpadding' => 1,
 201                                         'border' => 1));
 202     }
 203
 204     function _start_block($header) {
 205         $this->_block = HTML::table(array('width' => '100%',
 206                                           'class' => 'block',
 207                                           'cellspacing' => 0,
 208                                           'cellpadding' => 1,
 209                                           'border' => 0),
 210                                     HTML::tr(HTML::td(array('colspan' => 2),
 211                                                       HTML::tt($header))));
 212     }
 213
 214     function _end_block() {
 215         $this->_top->pushContent(HTML::tr(HTML::td($this->_block)));
 216         unset($this->_block);
 217     }
 218
 219     function _lines($lines, $class, $prefix = false, $elem = false) {
 220         if (!$prefix)
 221             $prefix = HTML::raw('&nbsp;');
 222         $prefix = HTML::td(array('class' => 'prefix',
 223                                  'width' => "1%"), $prefix);
 224         foreach ($lines as $line) {
 225             if (! trim($line))
 226                 $line = HTML::raw('&nbsp;');
 227             elseif ($elem)
 228                 $line = new HtmlElement($elem, $line);
 229             $this->_block->pushContent(HTML::tr(array('valign' => 'top'),
 230                                                 $prefix,
 231                                                 HTML::td(array('class' => $class),
 232                                                          $line)));
 233         }
 234     }
 235 }
 236
 237 /////////////////////////////////////////////////////////////////
 238
 239 function PageInfoRow ($label, $rev, &$request, $is_current = false)
 240 {
 241     global $WikiTheme;
 242
 243     $row = HTML::tr(HTML::td(array('align' => 'right'), $label));
 244     if ($rev) {
 245         $author = $rev->get('author');
 246         $dbi = $request->getDbh();
 247
 248         $iswikipage = (isWikiWord($author) && $dbi->isWikiPage($author));
 249         $authorlink = $iswikipage ? WikiLink($author) : $author;
 250         $version = $rev->getVersion();
 251         $linked_version = WikiLink($rev, 'existing', $version);
 252         if ($is_current)
 253             $revertbutton = HTML();
 254         else
 255             $revertbutton = $WikiTheme->makeActionButton(array('action' => 'revert',
 256                                                                'version' => $version),
 257                                                          false, $rev);
 258         $row->pushContent(HTML::td(fmt("version %s", $linked_version)),
 259                           HTML::td($WikiTheme->getLastModifiedMessage($rev,
 260                                                                       false)),
 261                           HTML::td(fmt("by %s", $authorlink)),
 262                           HTML::td($revertbutton)
 263                           );
 264     } else {
 265         $row->pushContent(HTML::td(array('colspan' => '4'), _("None")));
 266     }
 267     return $row;
 268 }
 269
 270 function showDiff (&$request) {
 271     $pagename = $request->getArg('pagename');
 272     if (is_array($versions = $request->getArg('versions'))) {
 273         // Version selection from pageinfo.php display:
 274         rsort($versions);
 275         list ($version, $previous) = $versions;
 276     }
 277     else {
 278         $version = $request->getArg('version');
 279         $previous = $request->getArg('previous');
 280     }
 281
 282     // abort if page doesn't exist
 283     $dbi = $request->getDbh();
 284     $page = $request->getPage();
 285     $current = $page->getCurrentRevision(false);
 286     if ($current->getVersion() < 1) {
 287         $html = HTML::div(array('class'=>'wikitext','id'=>'difftext'),
 288                           HTML::p(fmt("I'm sorry, there is no such page as %s.",
 289                                       WikiLink($pagename, 'unknown'))));
 290         require_once('lib/Template.php');
 291         GeneratePage($html, sprintf(_("Diff: %s"), $pagename), false);
 292         return; //early return
 293     }
 294
 295     if ($version) {
 296         if (!($new = $page->getRevision($version)))
 297             NoSuchRevision($request, $page, $version);
 298         $new_version = fmt("version %d", $version);
 299     }
 300     else {
 301         $new = $current;
 302         $new_version = _("current version");
 303     }
 304
 305     if (preg_match('/^\d+$/', $previous)) {
 306         if ( !($old = $page->getRevision($previous)) )
 307             NoSuchRevision($request, $page, $previous);
 308         $old_version = fmt("version %d", $previous);
 309         $others = array('major', 'minor', 'author');
 310     }
 311     else {
 312         switch ($previous) {
 313         case 'author':
 314             $old = $new;
 315             while ($old = $page->getRevisionBefore($old)) {
 316                 if ($old->get('author') != $new->get('author'))
 317                     break;
 318             }
 319             $old_version = _("revision by previous author");
 320             $others = array('major', 'minor');
 321             break;
 322         case 'minor':
 323             $previous='minor';
 324             $old = $page->getRevisionBefore($new);
 325             $old_version = _("previous revision");
 326             $others = array('major', 'author');
 327             break;
 328         case 'major':
 329         default:
 330             $old = $new;
 331             while ($old && $old->get('is_minor_edit'))
 332                 $old = $page->getRevisionBefore($old);
 333             if ($old)
 334                 $old = $page->getRevisionBefore($old);
 335             $old_version = _("predecessor to the previous major change");
 336             $others = array('minor', 'author');
 337             break;
 338         }
 339     }
 340
 341     $new_link = WikiLink($new, '', $new_version);
 342     $old_link = $old ? WikiLink($old, '', $old_version) : $old_version;
 343     $page_link = WikiLink($page);
 344
 345     $html = HTML::div(array('class'=>'wikitext','id'=>'difftext'),
 346                      HTML::p(fmt("Differences between %s and %s of %s.",
 347                                  $new_link, $old_link, $page_link)));
 348
 349     $otherdiffs = HTML::p(_("Other diffs:"));
 350     $label = array('major' => _("Previous Major Revision"),
 351                    'minor' => _("Previous Revision"),
 352                    'author'=> _("Previous Author"));
 353     foreach ($others as $other) {
 354         $args = array('action' => 'diff', 'previous' => $other);
 355         if ($version)
 356             $args['version'] = $version;
 357         if (count($otherdiffs->getContent()) > 1)
 358             $otherdiffs->pushContent(", ");
 359         else
 360             $otherdiffs->pushContent(" ");
 361         $otherdiffs->pushContent(Button($args, $label[$other]));
 362     }
 363     $html->pushContent($otherdiffs);
 364
 365     if ($old and $old->getVersion() == 0)
 366         $old = false;
 367
 368     $html->pushContent(HTML::Table(PageInfoRow(_("Newer page:"), $new,
 369                                                $request, empty($version)),
 370                                    PageInfoRow(_("Older page:"), $old,
 371                                                $request, false)));
 372
 373     if ($new && $old) {
 374         $diff = new Diff($old->getContent(), $new->getContent());
 375
 376         if ($diff->isEmpty()) {
 377             $html->pushContent(HTML::hr(),
 378                                HTML::p(_("Content of versions "), $old->getVersion(),
 379                                        _(" and "), $new->getVersion(), _(" is identical.")));
 380             // If two consecutive versions have the same content, it is because the page was
 381             // renamed, or metadata changed: ACL, owner, markup.
 382             // We give the reason by printing the summary.
 383             if (($new->getVersion() - $old->getVersion()) == 1) {
 384                 $html->pushContent(HTML::p(_("Version "), $new->getVersion(),
 385                                            _(" was created because: "), $new->get('summary')));
 386             }
 387         } else {
 388             $fmt = new HtmlUnifiedDiffFormatter;
 389             $html->pushContent($fmt->format($diff));
 390         }
 391
 392         $html->pushContent(HTML::hr(), HTML::h2($new_version));
 393         require_once("lib/BlockParser.php");
 394         $html->pushContent(TransformText($new,$new->get('markup'),$pagename));
 395     }
 396
 397     require_once('lib/Template.php');
 398     GeneratePage($html, sprintf(_("Diff: %s"), $pagename), $new);
 399 }
 400
 401 // Local Variables:
 402 // mode: php
 403 // tab-width: 8
 404 // c-basic-offset: 4
 405 // c-hanging-comment-ender-p: nil
 406 // indent-tabs-mode: nil
 407 // End:
 408 ?>