includes/parser/Preprocessor_DOM.php

   1 <?php
   2 /**
   3  * Preprocessor using PHP's dom extension
   4  *
   5  * @file
   6  * @ingroup Parser
   7  */
   8
   9 /**
  10  * @ingroup Parser
  11  */
  12 class Preprocessor_DOM implements Preprocessor {
  13         var $parser, $memoryLimit;
  14
  15         const CACHE_VERSION = 1;
  16
  17         function __construct( $parser ) {
  18                 $this->parser = $parser;
  19                 $mem = ini_get( 'memory_limit' );
  20                 $this->memoryLimit = false;
  21                 if ( strval( $mem ) !== '' && $mem != -1 ) {
  22                         if ( preg_match( '/^\d+$/', $mem ) ) {
  23                                 $this->memoryLimit = $mem;
  24                         } elseif ( preg_match( '/^(\d+)M$/i', $mem, $m ) ) {
  25                                 $this->memoryLimit = $m[1] * 1048576;
  26                         }
  27                 }
  28         }
  29
  30         /**
  31          * @return PPFrame_DOM
  32          */
  33         function newFrame() {
  34                 return new PPFrame_DOM( $this );
  35         }
  36
  37         /**
  38          * @param $args
  39          * @return PPCustomFrame_DOM
  40          */
  41         function newCustomFrame( $args ) {
  42                 return new PPCustomFrame_DOM( $this, $args );
  43         }
  44
  45         function newPartNodeArray( $values ) {
  46                 //NOTE: DOM manipulation is slower than building & parsing XML! (or so Tim sais)
  47                 $xml = "<list>";
  48
  49                 foreach ( $values as $k => $val ) {
  50
  51                         if ( is_int( $k ) ) {
  52                                 $xml .= "<part><name index=\"$k\"/><value>" . htmlspecialchars( $val ) ."</value></part>";
  53                         } else {
  54                                 $xml .= "<part><name>" . htmlspecialchars( $k ) . "</name>=<value>" . htmlspecialchars( $val ) . "</value></part>";
  55                         }
  56                 }
  57
  58                 $xml .= "</list>";
  59
  60                 $dom = new DOMDocument();
  61                 $dom->loadXML( $xml );
  62                 $root = $dom->documentElement;
  63
  64                 $node = new PPNode_DOM( $root->childNodes );
  65                 return $node;
  66         }
  67
  68         function memCheck() {
  69                 if ( $this->memoryLimit === false ) {
  70                         return;
  71                 }
  72                 $usage = memory_get_usage();
  73                 if ( $usage > $this->memoryLimit * 0.9 ) {
  74                         $limit = intval( $this->memoryLimit * 0.9 / 1048576 + 0.5 );
  75                         throw new MWException( "Preprocessor hit 90% memory limit ($limit MB)" );
  76                 }
  77                 return $usage <= $this->memoryLimit * 0.8;
  78         }
  79
  80         /**
  81          * Preprocess some wikitext and return the document tree.
  82          * This is the ghost of Parser::replace_variables().
  83          *
  84          * @param $text String: the text to parse
  85          * @param $flags Integer: bitwise combination of:
  86          *          Parser::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
  87          *                                     included. Default is to assume a direct page view.
  88          *
  89          * The generated DOM tree must depend only on the input text and the flags.
  90          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
  91          *
  92          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
  93          * change in the DOM tree for a given text, must be passed through the section identifier
  94          * in the section edit link and thus back to extractSections().
  95          *
  96          * The output of this function is currently only cached in process memory, but a persistent
  97          * cache may be implemented at a later date which takes further advantage of these strict
  98          * dependency requirements.
  99          *
 100          * @private
 101          */
 102         function preprocessToObj( $text, $flags = 0 ) {
 103                 wfProfileIn( __METHOD__ );
 104                 global $wgMemc, $wgPreprocessorCacheThreshold;
 105
 106                 $xml = false;
 107                 $cacheable = $wgPreprocessorCacheThreshold !== false && strlen( $text ) > $wgPreprocessorCacheThreshold;
 108                 if ( $cacheable ) {
 109                         wfProfileIn( __METHOD__.'-cacheable' );
 110
 111                         $cacheKey = wfMemcKey( 'preprocess-xml', md5($text), $flags );
 112                         $cacheValue = $wgMemc->get( $cacheKey );
 113                         if ( $cacheValue ) {
 114                                 $version = substr( $cacheValue, 0, 8 );
 115                                 if ( intval( $version ) == self::CACHE_VERSION ) {
 116                                         $xml = substr( $cacheValue, 8 );
 117                                         // From the cache
 118                                         wfDebugLog( "Preprocessor", "Loaded preprocessor XML from memcached (key $cacheKey)" );
 119                                 }
 120                         }
 121                 }
 122                 if ( $xml === false ) {
 123                         if ( $cacheable ) {
 124                                 wfProfileIn( __METHOD__.'-cache-miss' );
 125                                 $xml = $this->preprocessToXml( $text, $flags );
 126                                 $cacheValue = sprintf( "%08d", self::CACHE_VERSION ) . $xml;
 127                                 $wgMemc->set( $cacheKey, $cacheValue, 86400 );
 128                                 wfProfileOut( __METHOD__.'-cache-miss' );
 129                                 wfDebugLog( "Preprocessor", "Saved preprocessor XML to memcached (key $cacheKey)" );
 130                         } else {
 131                                 $xml = $this->preprocessToXml( $text, $flags );
 132                         }
 133
 134                 }
 135                 wfProfileIn( __METHOD__.'-loadXML' );
 136                 $dom = new DOMDocument;
 137                 wfSuppressWarnings();
 138                 $result = $dom->loadXML( $xml );
 139                 wfRestoreWarnings();
 140                 if ( !$result ) {
 141                         // Try running the XML through UtfNormal to get rid of invalid characters
 142                         $xml = UtfNormal::cleanUp( $xml );
 143                         $result = $dom->loadXML( $xml );
 144                         if ( !$result ) {
 145                                 throw new MWException( __METHOD__.' generated invalid XML' );
 146                         }
 147                 }
 148                 $obj = new PPNode_DOM( $dom->documentElement );
 149                 wfProfileOut( __METHOD__.'-loadXML' );
 150                 if ( $cacheable ) {
 151                         wfProfileOut( __METHOD__.'-cacheable' );
 152                 }
 153                 wfProfileOut( __METHOD__ );
 154                 return $obj;
 155         }
 156
 157         function preprocessToXml( $text, $flags = 0 ) {
 158                 wfProfileIn( __METHOD__ );
 159                 $rules = array(
 160                         '{' => array(
 161                                 'end' => '}',
 162                                 'names' => array(
 163                                         2 => 'template',
 164                                         3 => 'tplarg',
 165                                 ),
 166                                 'min' => 2,
 167                                 'max' => 3,
 168                         ),
 169                         '[' => array(
 170                                 'end' => ']',
 171                                 'names' => array( 2 => null ),
 172                                 'min' => 2,
 173                                 'max' => 2,
 174                         )
 175                 );
 176
 177                 $forInclusion = $flags & Parser::PTD_FOR_INCLUSION;
 178
 179                 $xmlishElements = $this->parser->getStripList();
 180                 $enableOnlyinclude = false;
 181                 if ( $forInclusion ) {
 182                         $ignoredTags = array( 'includeonly', '/includeonly' );
 183                         $ignoredElements = array( 'noinclude' );
 184                         $xmlishElements[] = 'noinclude';
 185                         if ( strpos( $text, '<onlyinclude>' ) !== false && strpos( $text, '</onlyinclude>' ) !== false ) {
 186                                 $enableOnlyinclude = true;
 187                         }
 188                 } else {
 189                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude' );
 190                         $ignoredElements = array( 'includeonly' );
 191                         $xmlishElements[] = 'includeonly';
 192                 }
 193                 $xmlishRegex = implode( '|', array_merge( $xmlishElements, $ignoredTags ) );
 194
 195                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
 196                 $elementsRegex = "~($xmlishRegex)(?:\s|\/>|>)|(!--)~iA";
 197
 198                 $stack = new PPDStack;
 199
 200                 $searchBase = "[{<\n"; #}
 201                 $revText = strrev( $text ); // For fast reverse searches
 202
 203                 $i = 0;                     # Input pointer, starts out pointing to a pseudo-newline before the start
 204                 $accum =& $stack->getAccum();   # Current accumulator
 205                 $accum = '<root>';
 206                 $findEquals = false;            # True to find equals signs in arguments
 207                 $findPipe = false;              # True to take notice of pipe characters
 208                 $headingIndex = 1;
 209                 $inHeading = false;        # True if $i is inside a possible heading
 210                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
 211                 $findOnlyinclude = $enableOnlyinclude; # True to ignore all input up to the next <onlyinclude>
 212                 $fakeLineStart = true;     # Do a line-start run without outputting an LF character
 213
 214                 while ( true ) {
 215                         //$this->memCheck();
 216
 217                         if ( $findOnlyinclude ) {
 218                                 // Ignore all input up to the next <onlyinclude>
 219                                 $startPos = strpos( $text, '<onlyinclude>', $i );
 220                                 if ( $startPos === false ) {
 221                                         // Ignored section runs to the end
 222                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i ) ) . '</ignore>';
 223                                         break;
 224                                 }
 225                                 $tagEndPos = $startPos + strlen( '<onlyinclude>' ); // past-the-end
 226                                 $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i, $tagEndPos - $i ) ) . '</ignore>';
 227                                 $i = $tagEndPos;
 228                                 $findOnlyinclude = false;
 229                         }
 230
 231                         if ( $fakeLineStart ) {
 232                                 $found = 'line-start';
 233                                 $curChar = '';
 234                         } else {
 235                                 # Find next opening brace, closing brace or pipe
 236                                 $search = $searchBase;
 237                                 if ( $stack->top === false ) {
 238                                         $currentClosing = '';
 239                                 } else {
 240                                         $currentClosing = $stack->top->close;
 241                                         $search .= $currentClosing;
 242                                 }
 243                                 if ( $findPipe ) {
 244                                         $search .= '|';
 245                                 }
 246                                 if ( $findEquals ) {
 247                                         // First equals will be for the template
 248                                         $search .= '=';
 249                                 }
 250                                 $rule = null;
 251                                 # Output literal section, advance input counter
 252                                 $literalLength = strcspn( $text, $search, $i );
 253                                 if ( $literalLength > 0 ) {
 254                                         $accum .= htmlspecialchars( substr( $text, $i, $literalLength ) );
 255                                         $i += $literalLength;
 256                                 }
 257                                 if ( $i >= strlen( $text ) ) {
 258                                         if ( $currentClosing == "\n" ) {
 259                                                 // Do a past-the-end run to finish off the heading
 260                                                 $curChar = '';
 261                                                 $found = 'line-end';
 262                                         } else {
 263                                                 # All done
 264                                                 break;
 265                                         }
 266                                 } else {
 267                                         $curChar = $text[$i];
 268                                         if ( $curChar == '|' ) {
 269                                                 $found = 'pipe';
 270                                         } elseif ( $curChar == '=' ) {
 271                                                 $found = 'equals';
 272                                         } elseif ( $curChar == '<' ) {
 273                                                 $found = 'angle';
 274                                         } elseif ( $curChar == "\n" ) {
 275                                                 if ( $inHeading ) {
 276                                                         $found = 'line-end';
 277                                                 } else {
 278                                                         $found = 'line-start';
 279                                                 }
 280                                         } elseif ( $curChar == $currentClosing ) {
 281                                                 $found = 'close';
 282                                         } elseif ( isset( $rules[$curChar] ) ) {
 283                                                 $found = 'open';
 284                                                 $rule = $rules[$curChar];
 285                                         } else {
 286                                                 # Some versions of PHP have a strcspn which stops on null characters
 287                                                 # Ignore and continue
 288                                                 ++$i;
 289                                                 continue;
 290                                         }
 291                                 }
 292                         }
 293
 294                         if ( $found == 'angle' ) {
 295                                 $matches = false;
 296                                 // Handle </onlyinclude>
 297                                 if ( $enableOnlyinclude && substr( $text, $i, strlen( '</onlyinclude>' ) ) == '</onlyinclude>' ) {
 298                                         $findOnlyinclude = true;
 299                                         continue;
 300                                 }
 301
 302                                 // Determine element name
 303                                 if ( !preg_match( $elementsRegex, $text, $matches, 0, $i + 1 ) ) {
 304                                         // Element name missing or not listed
 305                                         $accum .= '&lt;';
 306                                         ++$i;
 307                                         continue;
 308                                 }
 309                                 // Handle comments
 310                                 if ( isset( $matches[2] ) && $matches[2] == '!--' ) {
 311                                         // To avoid leaving blank lines, when a comment is both preceded
 312                                         // and followed by a newline (ignoring spaces), trim leading and
 313                                         // trailing spaces and one of the newlines.
 314
 315                                         // Find the end
 316                                         $endPos = strpos( $text, '-->', $i + 4 );
 317                                         if ( $endPos === false ) {
 318                                                 // Unclosed comment in input, runs to end
 319                                                 $inner = substr( $text, $i );
 320                                                 $accum .= '<comment>' . htmlspecialchars( $inner ) . '</comment>';
 321                                                 $i = strlen( $text );
 322                                         } else {
 323                                                 // Search backwards for leading whitespace
 324                                                 $wsStart = $i ? ( $i - strspn( $revText, ' ', strlen( $text ) - $i ) ) : 0;
 325                                                 // Search forwards for trailing whitespace
 326                                                 // $wsEnd will be the position of the last space (or the '>' if there's none)
 327                                                 $wsEnd = $endPos + 2 + strspn( $text, ' ', $endPos + 3 );
 328                                                 // Eat the line if possible
 329                                                 // TODO: This could theoretically be done if $wsStart == 0, i.e. for comments at
 330                                                 // the overall start. That's not how Sanitizer::removeHTMLcomments() did it, but
 331                                                 // it's a possible beneficial b/c break.
 332                                                 if ( $wsStart > 0 && substr( $text, $wsStart - 1, 1 ) == "\n"
 333                                                         && substr( $text, $wsEnd + 1, 1 ) == "\n" )
 334                                                 {
 335                                                         $startPos = $wsStart;
 336                                                         $endPos = $wsEnd + 1;
 337                                                         // Remove leading whitespace from the end of the accumulator
 338                                                         // Sanity check first though
 339                                                         $wsLength = $i - $wsStart;
 340                                                         if ( $wsLength > 0 && substr( $accum, -$wsLength ) === str_repeat( ' ', $wsLength ) ) {
 341                                                                 $accum = substr( $accum, 0, -$wsLength );
 342                                                         }
 343                                                         // Do a line-start run next time to look for headings after the comment
 344                                                         $fakeLineStart = true;
 345                                                 } else {
 346                                                         // No line to eat, just take the comment itself
 347                                                         $startPos = $i;
 348                                                         $endPos += 2;
 349                                                 }
 350
 351                                                 if ( $stack->top ) {
 352                                                         $part = $stack->top->getCurrentPart();
 353                                                         if ( ! (isset( $part->commentEnd ) && $part->commentEnd == $wsStart - 1 )) {
 354                                                                 $part->visualEnd = $wsStart;
 355                                                         }
 356                                                         // Else comments abutting, no change in visual end
 357                                                         $part->commentEnd = $endPos;
 358                                                 }
 359                                                 $i = $endPos + 1;
 360                                                 $inner = substr( $text, $startPos, $endPos - $startPos + 1 );
 361                                                 $accum .= '<comment>' . htmlspecialchars( $inner ) . '</comment>';
 362                                         }
 363                                         continue;
 364                                 }
 365                                 $name = $matches[1];
 366                                 $lowerName = strtolower( $name );
 367                                 $attrStart = $i + strlen( $name ) + 1;
 368
 369                                 // Find end of tag
 370                                 $tagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
 371                                 if ( $tagEndPos === false ) {
 372                                         // Infinite backtrack
 373                                         // Disable tag search to prevent worst-case O(N^2) performance
 374                                         $noMoreGT = true;
 375                                         $accum .= '&lt;';
 376                                         ++$i;
 377                                         continue;
 378                                 }
 379
 380                                 // Handle ignored tags
 381                                 if ( in_array( $lowerName, $ignoredTags ) ) {
 382                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i, $tagEndPos - $i + 1 ) ) . '</ignore>';
 383                                         $i = $tagEndPos + 1;
 384                                         continue;
 385                                 }
 386
 387                                 $tagStartPos = $i;
 388                                 if ( $text[$tagEndPos-1] == '/' ) {
 389                                         $attrEnd = $tagEndPos - 1;
 390                                         $inner = null;
 391                                         $i = $tagEndPos + 1;
 392                                         $close = '';
 393                                 } else {
 394                                         $attrEnd = $tagEndPos;
 395                                         // Find closing tag
 396                                         if ( preg_match( "/<\/" . preg_quote( $name, '/' ) . "\s*>/i",
 397                                                         $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) )
 398                                         {
 399                                                 $inner = substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 );
 400                                                 $i = $matches[0][1] + strlen( $matches[0][0] );
 401                                                 $close = '<close>' . htmlspecialchars( $matches[0][0] ) . '</close>';
 402                                         } else {
 403                                                 // No end tag -- let it run out to the end of the text.
 404                                                 $inner = substr( $text, $tagEndPos + 1 );
 405                                                 $i = strlen( $text );
 406                                                 $close = '';
 407                                         }
 408                                 }
 409                                 // <includeonly> and <noinclude> just become <ignore> tags
 410                                 if ( in_array( $lowerName, $ignoredElements ) ) {
 411                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $tagStartPos, $i - $tagStartPos ) )
 412                                                 . '</ignore>';
 413                                         continue;
 414                                 }
 415
 416                                 $accum .= '<ext>';
 417                                 if ( $attrEnd <= $attrStart ) {
 418                                         $attr = '';
 419                                 } else {
 420                                         $attr = substr( $text, $attrStart, $attrEnd - $attrStart );
 421                                 }
 422                                 $accum .= '<name>' . htmlspecialchars( $name ) . '</name>' .
 423                                         // Note that the attr element contains the whitespace between name and attribute,
 424                                         // this is necessary for precise reconstruction during pre-save transform.
 425                                         '<attr>' . htmlspecialchars( $attr ) . '</attr>';
 426                                 if ( $inner !== null ) {
 427                                         $accum .= '<inner>' . htmlspecialchars( $inner ) . '</inner>';
 428                                 }
 429                                 $accum .= $close . '</ext>';
 430                         }
 431
 432                         elseif ( $found == 'line-start' ) {
 433                                 // Is this the start of a heading?
 434                                 // Line break belongs before the heading element in any case
 435                                 if ( $fakeLineStart ) {
 436                                         $fakeLineStart = false;
 437                                 } else {
 438                                         $accum .= $curChar;
 439                                         $i++;
 440                                 }
 441
 442                                 $count = strspn( $text, '=', $i, 6 );
 443                                 if ( $count == 1 && $findEquals ) {
 444                                         // DWIM: This looks kind of like a name/value separator
 445                                         // Let's let the equals handler have it and break the potential heading
 446                                         // This is heuristic, but AFAICT the methods for completely correct disambiguation are very complex.
 447                                 } elseif ( $count > 0 ) {
 448                                         $piece = array(
 449                                                 'open' => "\n",
 450                                                 'close' => "\n",
 451                                                 'parts' => array( new PPDPart( str_repeat( '=', $count ) ) ),
 452                                                 'startPos' => $i,
 453                                                 'count' => $count );
 454                                         $stack->push( $piece );
 455                                         $accum =& $stack->getAccum();
 456                                         $flags = $stack->getFlags();
 457                                         extract( $flags );
 458                                         $i += $count;
 459                                 }
 460                         }
 461
 462                         elseif ( $found == 'line-end' ) {
 463                                 $piece = $stack->top;
 464                                 // A heading must be open, otherwise \n wouldn't have been in the search list
 465                                 assert( $piece->open == "\n" );
 466                                 $part = $piece->getCurrentPart();
 467                                 // Search back through the input to see if it has a proper close
 468                                 // Do this using the reversed string since the other solutions (end anchor, etc.) are inefficient
 469                                 $wsLength = strspn( $revText, " \t", strlen( $text ) - $i );
 470                                 $searchStart = $i - $wsLength;
 471                                 if ( isset( $part->commentEnd ) && $searchStart - 1 == $part->commentEnd ) {
 472                                         // Comment found at line end
 473                                         // Search for equals signs before the comment
 474                                         $searchStart = $part->visualEnd;
 475                                         $searchStart -= strspn( $revText, " \t", strlen( $text ) - $searchStart );
 476                                 }
 477                                 $count = $piece->count;
 478                                 $equalsLength = strspn( $revText, '=', strlen( $text ) - $searchStart );
 479                                 if ( $equalsLength > 0 ) {
 480                                         if ( $searchStart - $equalsLength == $piece->startPos ) {
 481                                                 // This is just a single string of equals signs on its own line
 482                                                 // Replicate the doHeadings behaviour /={count}(.+)={count}/
 483                                                 // First find out how many equals signs there really are (don't stop at 6)
 484                                                 $count = $equalsLength;
 485                                                 if ( $count < 3 ) {
 486                                                         $count = 0;
 487                                                 } else {
 488                                                         $count = min( 6, intval( ( $count - 1 ) / 2 ) );
 489                                                 }
 490                                         } else {
 491                                                 $count = min( $equalsLength, $count );
 492                                         }
 493                                         if ( $count > 0 ) {
 494                                                 // Normal match, output <h>
 495                                                 $element = "<h level=\"$count\" i=\"$headingIndex\">$accum</h>";
 496                                                 $headingIndex++;
 497                                         } else {
 498                                                 // Single equals sign on its own line, count=0
 499                                                 $element = $accum;
 500                                         }
 501                                 } else {
 502                                         // No match, no <h>, just pass down the inner text
 503                                         $element = $accum;
 504                                 }
 505                                 // Unwind the stack
 506                                 $stack->pop();
 507                                 $accum =& $stack->getAccum();
 508                                 $flags = $stack->getFlags();
 509                                 extract( $flags );
 510
 511                                 // Append the result to the enclosing accumulator
 512                                 $accum .= $element;
 513                                 // Note that we do NOT increment the input pointer.
 514                                 // This is because the closing linebreak could be the opening linebreak of
 515                                 // another heading. Infinite loops are avoided because the next iteration MUST
 516                                 // hit the heading open case above, which unconditionally increments the
 517                                 // input pointer.
 518                         } elseif ( $found == 'open' ) {
 519                                 # count opening brace characters
 520                                 $count = strspn( $text, $curChar, $i );
 521
 522                                 # we need to add to stack only if opening brace count is enough for one of the rules
 523                                 if ( $count >= $rule['min'] ) {
 524                                         # Add it to the stack
 525                                         $piece = array(
 526                                                 'open' => $curChar,
 527                                                 'close' => $rule['end'],
 528                                                 'count' => $count,
 529                                                 'lineStart' => ($i == 0 || $text[$i-1] == "\n"),
 530                                         );
 531
 532                                         $stack->push( $piece );
 533                                         $accum =& $stack->getAccum();
 534                                         $flags = $stack->getFlags();
 535                                         extract( $flags );
 536                                 } else {
 537                                         # Add literal brace(s)
 538                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
 539                                 }
 540                                 $i += $count;
 541                         } elseif ( $found == 'close' ) {
 542                                 $piece = $stack->top;
 543                                 # lets check if there are enough characters for closing brace
 544                                 $maxCount = $piece->count;
 545                                 $count = strspn( $text, $curChar, $i, $maxCount );
 546
 547                                 # check for maximum matching characters (if there are 5 closing
 548                                 # characters, we will probably need only 3 - depending on the rules)
 549                                 $rule = $rules[$piece->open];
 550                                 if ( $count > $rule['max'] ) {
 551                                         # The specified maximum exists in the callback array, unless the caller
 552                                         # has made an error
 553                                         $matchingCount = $rule['max'];
 554                                 } else {
 555                                         # Count is less than the maximum
 556                                         # Skip any gaps in the callback array to find the true largest match
 557                                         # Need to use array_key_exists not isset because the callback can be null
 558                                         $matchingCount = $count;
 559                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
 560                                                 --$matchingCount;
 561                                         }
 562                                 }
 563
 564                                 if ($matchingCount <= 0) {
 565                                         # No matching element found in callback array
 566                                         # Output a literal closing brace and continue
 567                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
 568                                         $i += $count;
 569                                         continue;
 570                                 }
 571                                 $name = $rule['names'][$matchingCount];
 572                                 if ( $name === null ) {
 573                                         // No element, just literal text
 574                                         $element = $piece->breakSyntax( $matchingCount ) . str_repeat( $rule['end'], $matchingCount );
 575                                 } else {
 576                                         # Create XML element
 577                                         # Note: $parts is already XML, does not need to be encoded further
 578                                         $parts = $piece->parts;
 579                                         $title = $parts[0]->out;
 580                                         unset( $parts[0] );
 581
 582                                         # The invocation is at the start of the line if lineStart is set in
 583                                         # the stack, and all opening brackets are used up.
 584                                         if ( $maxCount == $matchingCount && !empty( $piece->lineStart ) ) {
 585                                                 $attr = ' lineStart="1"';
 586                                         } else {
 587                                                 $attr = '';
 588                                         }
 589
 590                                         $element = "<$name$attr>";
 591                                         $element .= "<title>$title</title>";
 592                                         $argIndex = 1;
 593                                         foreach ( $parts as $part ) {
 594                                                 if ( isset( $part->eqpos ) ) {
 595                                                         $argName = substr( $part->out, 0, $part->eqpos );
 596                                                         $argValue = substr( $part->out, $part->eqpos + 1 );
 597                                                         $element .= "<part><name>$argName</name>=<value>$argValue</value></part>";
 598                                                 } else {
 599                                                         $element .= "<part><name index=\"$argIndex\" /><value>{$part->out}</value></part>";
 600                                                         $argIndex++;
 601                                                 }
 602                                         }
 603                                         $element .= "</$name>";
 604                                 }
 605
 606                                 # Advance input pointer
 607                                 $i += $matchingCount;
 608
 609                                 # Unwind the stack
 610                                 $stack->pop();
 611                                 $accum =& $stack->getAccum();
 612
 613                                 # Re-add the old stack element if it still has unmatched opening characters remaining
 614                                 if ($matchingCount < $piece->count) {
 615                                         $piece->parts = array( new PPDPart );
 616                                         $piece->count -= $matchingCount;
 617                                         # do we still qualify for any callback with remaining count?
 618                                         $names = $rules[$piece->open]['names'];
 619                                         $skippedBraces = 0;
 620                                         $enclosingAccum =& $accum;
 621                                         while ( $piece->count ) {
 622                                                 if ( array_key_exists( $piece->count, $names ) ) {
 623                                                         $stack->push( $piece );
 624                                                         $accum =& $stack->getAccum();
 625                                                         break;
 626                                                 }
 627                                                 --$piece->count;
 628                                                 $skippedBraces ++;
 629                                         }
 630                                         $enclosingAccum .= str_repeat( $piece->open, $skippedBraces );
 631                                 }
 632                                 $flags = $stack->getFlags();
 633                                 extract( $flags );
 634
 635                                 # Add XML element to the enclosing accumulator
 636                                 $accum .= $element;
 637                         }
 638
 639                         elseif ( $found == 'pipe' ) {
 640                                 $findEquals = true; // shortcut for getFlags()
 641                                 $stack->addPart();
 642                                 $accum =& $stack->getAccum();
 643                                 ++$i;
 644                         }
 645
 646                         elseif ( $found == 'equals' ) {
 647                                 $findEquals = false; // shortcut for getFlags()
 648                                 $stack->getCurrentPart()->eqpos = strlen( $accum );
 649                                 $accum .= '=';
 650                                 ++$i;
 651                         }
 652                 }
 653
 654                 # Output any remaining unclosed brackets
 655                 foreach ( $stack->stack as $piece ) {
 656                         $stack->rootAccum .= $piece->breakSyntax();
 657                 }
 658                 $stack->rootAccum .= '</root>';
 659                 $xml = $stack->rootAccum;
 660
 661                 wfProfileOut( __METHOD__ );
 662
 663                 return $xml;
 664         }
 665 }
 666
 667 /**
 668  * Stack class to help Preprocessor::preprocessToObj()
 669  * @ingroup Parser
 670  */
 671 class PPDStack {
 672         var $stack, $rootAccum, $top;
 673         var $out;
 674         var $elementClass = 'PPDStackElement';
 675
 676         static $false = false;
 677
 678         function __construct() {
 679                 $this->stack = array();
 680                 $this->top = false;
 681                 $this->rootAccum = '';
 682                 $this->accum =& $this->rootAccum;
 683         }
 684
 685         function count() {
 686                 return count( $this->stack );
 687         }
 688
 689         function &getAccum() {
 690                 return $this->accum;
 691         }
 692
 693         function getCurrentPart() {
 694                 if ( $this->top === false ) {
 695                         return false;
 696                 } else {
 697                         return $this->top->getCurrentPart();
 698                 }
 699         }
 700
 701         function push( $data ) {
 702                 if ( $data instanceof $this->elementClass ) {
 703                         $this->stack[] = $data;
 704                 } else {
 705                         $class = $this->elementClass;
 706                         $this->stack[] = new $class( $data );
 707                 }
 708                 $this->top = $this->stack[ count( $this->stack ) - 1 ];
 709                 $this->accum =& $this->top->getAccum();
 710         }
 711
 712         function pop() {
 713                 if ( !count( $this->stack ) ) {
 714                         throw new MWException( __METHOD__.': no elements remaining' );
 715                 }
 716                 $temp = array_pop( $this->stack );
 717
 718                 if ( count( $this->stack ) ) {
 719                         $this->top = $this->stack[ count( $this->stack ) - 1 ];
 720                         $this->accum =& $this->top->getAccum();
 721                 } else {
 722                         $this->top = self::$false;
 723                         $this->accum =& $this->rootAccum;
 724                 }
 725                 return $temp;
 726         }
 727
 728         function addPart( $s = '' ) {
 729                 $this->top->addPart( $s );
 730                 $this->accum =& $this->top->getAccum();
 731         }
 732
 733         function getFlags() {
 734                 if ( !count( $this->stack ) ) {
 735                         return array(
 736                                 'findEquals' => false,
 737                                 'findPipe' => false,
 738                                 'inHeading' => false,
 739                         );
 740                 } else {
 741                         return $this->top->getFlags();
 742                 }
 743         }
 744 }
 745
 746 /**
 747  * @ingroup Parser
 748  */
 749 class PPDStackElement {
 750         var $open,                      // Opening character (\n for heading)
 751                 $close,             // Matching closing character
 752                 $count,             // Number of opening characters found (number of "=" for heading)
 753                 $parts,             // Array of PPDPart objects describing pipe-separated parts.
 754                 $lineStart;         // True if the open char appeared at the start of the input line. Not set for headings.
 755
 756         var $partClass = 'PPDPart';
 757
 758         function __construct( $data = array() ) {
 759                 $class = $this->partClass;
 760                 $this->parts = array( new $class );
 761
 762                 foreach ( $data as $name => $value ) {
 763                         $this->$name = $value;
 764                 }
 765         }
 766
 767         function &getAccum() {
 768                 return $this->parts[count($this->parts) - 1]->out;
 769         }
 770
 771         function addPart( $s = '' ) {
 772                 $class = $this->partClass;
 773                 $this->parts[] = new $class( $s );
 774         }
 775
 776         function getCurrentPart() {
 777                 return $this->parts[count($this->parts) - 1];
 778         }
 779
 780         function getFlags() {
 781                 $partCount = count( $this->parts );
 782                 $findPipe = $this->open != "\n" && $this->open != '[';
 783                 return array(
 784                         'findPipe' => $findPipe,
 785                         'findEquals' => $findPipe && $partCount > 1 && !isset( $this->parts[$partCount - 1]->eqpos ),
 786                         'inHeading' => $this->open == "\n",
 787                 );
 788         }
 789
 790         /**
 791          * Get the output string that would result if the close is not found.
 792          */
 793         function breakSyntax( $openingCount = false ) {
 794                 if ( $this->open == "\n" ) {
 795                         $s = $this->parts[0]->out;
 796                 } else {
 797                         if ( $openingCount === false ) {
 798                                 $openingCount = $this->count;
 799                         }
 800                         $s = str_repeat( $this->open, $openingCount );
 801                         $first = true;
 802                         foreach ( $this->parts as $part ) {
 803                                 if ( $first ) {
 804                                         $first = false;
 805                                 } else {
 806                                         $s .= '|';
 807                                 }
 808                                 $s .= $part->out;
 809                         }
 810                 }
 811                 return $s;
 812         }
 813 }
 814
 815 /**
 816  * @ingroup Parser
 817  */
 818 class PPDPart {
 819         var $out; // Output accumulator string
 820
 821         // Optional member variables:
 822         //   eqpos        Position of equals sign in output accumulator
 823         //   commentEnd   Past-the-end input pointer for the last comment encountered
 824         //   visualEnd    Past-the-end input pointer for the end of the accumulator minus comments
 825
 826         function __construct( $out = '' ) {
 827                 $this->out = $out;
 828         }
 829 }
 830
 831 /**
 832  * An expansion frame, used as a context to expand the result of preprocessToObj()
 833  * @ingroup Parser
 834  */
 835 class PPFrame_DOM implements PPFrame {
 836         var $preprocessor, $parser, $title;
 837         var $titleCache;
 838
 839         /**
 840          * Hashtable listing templates which are disallowed for expansion in this frame,
 841          * having been encountered previously in parent frames.
 842          */
 843         var $loopCheckHash;
 844
 845         /**
 846          * Recursion depth of this frame, top = 0
 847          * Note that this is NOT the same as expansion depth in expand()
 848          */
 849         var $depth;
 850
 851
 852         /**
 853          * Construct a new preprocessor frame.
 854          * @param $preprocessor Preprocessor: The parent preprocessor
 855          */
 856         function __construct( $preprocessor ) {
 857                 $this->preprocessor = $preprocessor;
 858                 $this->parser = $preprocessor->parser;
 859                 $this->title = $this->parser->mTitle;
 860                 $this->titleCache = array( $this->title ? $this->title->getPrefixedDBkey() : false );
 861                 $this->loopCheckHash = array();
 862                 $this->depth = 0;
 863         }
 864
 865         /**
 866          * Create a new child frame
 867          * $args is optionally a multi-root PPNode or array containing the template arguments
 868          */
 869         function newChild( $args = false, $title = false ) {
 870                 $namedArgs = array();
 871                 $numberedArgs = array();
 872                 if ( $title === false ) {
 873                         $title = $this->title;
 874                 }
 875                 if ( $args !== false ) {
 876                         $xpath = false;
 877                         if ( $args instanceof PPNode ) {
 878                                 $args = $args->node;
 879                         }
 880                         foreach ( $args as $arg ) {
 881                                 if ( !$xpath ) {
 882                                         $xpath = new DOMXPath( $arg->ownerDocument );
 883                                 }
 884
 885                                 $nameNodes = $xpath->query( 'name', $arg );
 886                                 $value = $xpath->query( 'value', $arg );
 887                                 if ( $nameNodes->item( 0 )->hasAttributes() ) {
 888                                         // Numbered parameter
 889                                         $index = $nameNodes->item( 0 )->attributes->getNamedItem( 'index' )->textContent;
 890                                         $numberedArgs[$index] = $value->item( 0 );
 891                                         unset( $namedArgs[$index] );
 892                                 } else {
 893                                         // Named parameter
 894                                         $name = trim( $this->expand( $nameNodes->item( 0 ), PPFrame::STRIP_COMMENTS ) );
 895                                         $namedArgs[$name] = $value->item( 0 );
 896                                         unset( $numberedArgs[$name] );
 897                                 }
 898                         }
 899                 }
 900                 return new PPTemplateFrame_DOM( $this->preprocessor, $this, $numberedArgs, $namedArgs, $title );
 901         }
 902
 903         function expand( $root, $flags = 0 ) {
 904                 static $expansionDepth = 0;
 905                 if ( is_string( $root ) ) {
 906                         return $root;
 907                 }
 908
 909                 if ( ++$this->parser->mPPNodeCount > $this->parser->mOptions->getMaxPPNodeCount() )
 910                 {
 911                         return '<span class="error">Node-count limit exceeded</span>';
 912                 }
 913
 914                 if ( $expansionDepth > $this->parser->mOptions->getMaxPPExpandDepth() ) {
 915                         return '<span class="error">Expansion depth limit exceeded</span>';
 916                 }
 917                 wfProfileIn( __METHOD__ );
 918                 ++$expansionDepth;
 919
 920                 if ( $root instanceof PPNode_DOM ) {
 921                         $root = $root->node;
 922                 }
 923                 if ( $root instanceof DOMDocument ) {
 924                         $root = $root->documentElement;
 925                 }
 926
 927                 $outStack = array( '', '' );
 928                 $iteratorStack = array( false, $root );
 929                 $indexStack = array( 0, 0 );
 930
 931                 while ( count( $iteratorStack ) > 1 ) {
 932                         $level = count( $outStack ) - 1;
 933                         $iteratorNode =& $iteratorStack[ $level ];
 934                         $out =& $outStack[$level];
 935                         $index =& $indexStack[$level];
 936
 937                         if ( $iteratorNode instanceof PPNode_DOM ) $iteratorNode = $iteratorNode->node;
 938
 939                         if ( is_array( $iteratorNode ) ) {
 940                                 if ( $index >= count( $iteratorNode ) ) {
 941                                         // All done with this iterator
 942                                         $iteratorStack[$level] = false;
 943                                         $contextNode = false;
 944                                 } else {
 945                                         $contextNode = $iteratorNode[$index];
 946                                         $index++;
 947                                 }
 948                         } elseif ( $iteratorNode instanceof DOMNodeList ) {
 949                                 if ( $index >= $iteratorNode->length ) {
 950                                         // All done with this iterator
 951                                         $iteratorStack[$level] = false;
 952                                         $contextNode = false;
 953                                 } else {
 954                                         $contextNode = $iteratorNode->item( $index );
 955                                         $index++;
 956                                 }
 957                         } else {
 958                                 // Copy to $contextNode and then delete from iterator stack,
 959                                 // because this is not an iterator but we do have to execute it once
 960                                 $contextNode = $iteratorStack[$level];
 961                                 $iteratorStack[$level] = false;
 962                         }
 963
 964                         if ( $contextNode instanceof PPNode_DOM ) {
 965                                 $contextNode = $contextNode->node;
 966                         }
 967
 968                         $newIterator = false;
 969
 970                         if ( $contextNode === false ) {
 971                                 // nothing to do
 972                         } elseif ( is_string( $contextNode ) ) {
 973                                 $out .= $contextNode;
 974                         } elseif ( is_array( $contextNode ) || $contextNode instanceof DOMNodeList ) {
 975                                 $newIterator = $contextNode;
 976                         } elseif ( $contextNode instanceof DOMNode ) {
 977                                 if ( $contextNode->nodeType == XML_TEXT_NODE ) {
 978                                         $out .= $contextNode->nodeValue;
 979                                 } elseif ( $contextNode->nodeName == 'template' ) {
 980                                         # Double-brace expansion
 981                                         $xpath = new DOMXPath( $contextNode->ownerDocument );
 982                                         $titles = $xpath->query( 'title', $contextNode );
 983                                         $title = $titles->item( 0 );
 984                                         $parts = $xpath->query( 'part', $contextNode );
 985                                         if ( $flags & PPFrame::NO_TEMPLATES ) {
 986                                                 $newIterator = $this->virtualBracketedImplode( '{{', '|', '}}', $title, $parts );
 987                                         } else {
 988                                                 $lineStart = $contextNode->getAttribute( 'lineStart' );
 989                                                 $params = array(
 990                                                         'title' => new PPNode_DOM( $title ),
 991                                                         'parts' => new PPNode_DOM( $parts ),
 992                                                         'lineStart' => $lineStart );
 993                                                 $ret = $this->parser->braceSubstitution( $params, $this );
 994                                                 if ( isset( $ret['object'] ) ) {
 995                                                         $newIterator = $ret['object'];
 996                                                 } else {
 997                                                         $out .= $ret['text'];
 998                                                 }
 999                                         }
1000                                 } elseif ( $contextNode->nodeName == 'tplarg' ) {
1001                                         # Triple-brace expansion
1002                                         $xpath = new DOMXPath( $contextNode->ownerDocument );
1003                                         $titles = $xpath->query( 'title', $contextNode );
1004                                         $title = $titles->item( 0 );
1005                                         $parts = $xpath->query( 'part', $contextNode );
1006                                         if ( $flags & PPFrame::NO_ARGS ) {
1007                                                 $newIterator = $this->virtualBracketedImplode( '{{{', '|', '}}}', $title, $parts );
1008                                         } else {
1009                                                 $params = array(
1010                                                         'title' => new PPNode_DOM( $title ),
1011                                                         'parts' => new PPNode_DOM( $parts ) );
1012                                                 $ret = $this->parser->argSubstitution( $params, $this );
1013                                                 if ( isset( $ret['object'] ) ) {
1014                                                         $newIterator = $ret['object'];
1015                                                 } else {
1016                                                         $out .= $ret['text'];
1017                                                 }
1018                                         }
1019                                 } elseif ( $contextNode->nodeName == 'comment' ) {
1020                                         # HTML-style comment
1021                                         # Remove it in HTML, pre+remove and STRIP_COMMENTS modes
1022                                         if ( $this->parser->ot['html']
1023                                                 || ( $this->parser->ot['pre'] && $this->parser->mOptions->getRemoveComments() )
1024                                                 || ( $flags & PPFrame::STRIP_COMMENTS ) )
1025                                         {
1026                                                 $out .= '';
1027                                         }
1028                                         # Add a strip marker in PST mode so that pstPass2() can run some old-fashioned regexes on the result
1029                                         # Not in RECOVER_COMMENTS mode (extractSections) though
1030                                         elseif ( $this->parser->ot['wiki'] && ! ( $flags & PPFrame::RECOVER_COMMENTS ) ) {
1031                                                 $out .= $this->parser->insertStripItem( $contextNode->textContent );
1032                                         }
1033                                         # Recover the literal comment in RECOVER_COMMENTS and pre+no-remove
1034                                         else {
1035                                                 $out .= $contextNode->textContent;
1036                                         }
1037                                 } elseif ( $contextNode->nodeName == 'ignore' ) {
1038                                         # Output suppression used by <includeonly> etc.
1039                                         # OT_WIKI will only respect <ignore> in substed templates.
1040                                         # The other output types respect it unless NO_IGNORE is set.
1041                                         # extractSections() sets NO_IGNORE and so never respects it.
1042                                         if ( ( !isset( $this->parent ) && $this->parser->ot['wiki'] ) || ( $flags & PPFrame::NO_IGNORE ) ) {
1043                                                 $out .= $contextNode->textContent;
1044                                         } else {
1045                                                 $out .= '';
1046                                         }
1047                                 } elseif ( $contextNode->nodeName == 'ext' ) {
1048                                         # Extension tag
1049                                         $xpath = new DOMXPath( $contextNode->ownerDocument );
1050                                         $names = $xpath->query( 'name', $contextNode );
1051                                         $attrs = $xpath->query( 'attr', $contextNode );
1052                                         $inners = $xpath->query( 'inner', $contextNode );
1053                                         $closes = $xpath->query( 'close', $contextNode );
1054                                         $params = array(
1055                                                 'name' => new PPNode_DOM( $names->item( 0 ) ),
1056                                                 'attr' => $attrs->length > 0 ? new PPNode_DOM( $attrs->item( 0 ) ) : null,
1057                                                 'inner' => $inners->length > 0 ? new PPNode_DOM( $inners->item( 0 ) ) : null,
1058                                                 'close' => $closes->length > 0 ? new PPNode_DOM( $closes->item( 0 ) ) : null,
1059                                         );
1060                                         $out .= $this->parser->extensionSubstitution( $params, $this );
1061                                 } elseif ( $contextNode->nodeName == 'h' ) {
1062                                         # Heading
1063                                         $s = $this->expand( $contextNode->childNodes, $flags );
1064
1065                                         # Insert a heading marker only for <h> children of <root>
1066                                         # This is to stop extractSections from going over multiple tree levels
1067                                         if ( $contextNode->parentNode->nodeName == 'root'
1068                                           && $this->parser->ot['html'] )
1069                                         {
1070                                                 # Insert heading index marker
1071                                                 $headingIndex = $contextNode->getAttribute( 'i' );
1072                                                 $titleText = $this->title->getPrefixedDBkey();
1073                                                 $this->parser->mHeadings[] = array( $titleText, $headingIndex );
1074                                                 $serial = count( $this->parser->mHeadings ) - 1;
1075                                                 $marker = "{$this->parser->mUniqPrefix}-h-$serial-" . Parser::MARKER_SUFFIX;
1076                                                 $count = $contextNode->getAttribute( 'level' );
1077                                                 $s = substr( $s, 0, $count ) . $marker . substr( $s, $count );
1078                                                 $this->parser->mStripState->addGeneral( $marker, '' );
1079                                         }
1080                                         $out .= $s;
1081                                 } else {
1082                                         # Generic recursive expansion
1083                                         $newIterator = $contextNode->childNodes;
1084                                 }
1085                         } else {
1086                                 wfProfileOut( __METHOD__ );
1087                                 throw new MWException( __METHOD__.': Invalid parameter type' );
1088                         }
1089
1090                         if ( $newIterator !== false ) {
1091                                 if ( $newIterator instanceof PPNode_DOM ) {
1092                                         $newIterator = $newIterator->node;
1093                                 }
1094                                 $outStack[] = '';
1095                                 $iteratorStack[] = $newIterator;
1096                                 $indexStack[] = 0;
1097                         } elseif ( $iteratorStack[$level] === false ) {
1098                                 // Return accumulated value to parent
1099                                 // With tail recursion
1100                                 while ( $iteratorStack[$level] === false && $level > 0 ) {
1101                                         $outStack[$level - 1] .= $out;
1102                                         array_pop( $outStack );
1103                                         array_pop( $iteratorStack );
1104                                         array_pop( $indexStack );
1105                                         $level--;
1106                                 }
1107                         }
1108                 }
1109                 --$expansionDepth;
1110                 wfProfileOut( __METHOD__ );
1111                 return $outStack[0];
1112         }
1113
1114         function implodeWithFlags( $sep, $flags /*, ... */ ) {
1115                 $args = array_slice( func_get_args(), 2 );
1116
1117                 $first = true;
1118                 $s = '';
1119                 foreach ( $args as $root ) {
1120                         if ( $root instanceof PPNode_DOM ) $root = $root->node;
1121                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
1122                                 $root = array( $root );
1123                         }
1124                         foreach ( $root as $node ) {
1125                                 if ( $first ) {
1126                                         $first = false;
1127                                 } else {
1128                                         $s .= $sep;
1129                                 }
1130                                 $s .= $this->expand( $node, $flags );
1131                         }
1132                 }
1133                 return $s;
1134         }
1135
1136         /**
1137          * Implode with no flags specified
1138          * This previously called implodeWithFlags but has now been inlined to reduce stack depth
1139          */
1140         function implode( $sep /*, ... */ ) {
1141                 $args = array_slice( func_get_args(), 1 );
1142
1143                 $first = true;
1144                 $s = '';
1145                 foreach ( $args as $root ) {
1146                         if ( $root instanceof PPNode_DOM ) {
1147                                 $root = $root->node;
1148                         }
1149                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
1150                                 $root = array( $root );
1151                         }
1152                         foreach ( $root as $node ) {
1153                                 if ( $first ) {
1154                                         $first = false;
1155                                 } else {
1156                                         $s .= $sep;
1157                                 }
1158                                 $s .= $this->expand( $node );
1159                         }
1160                 }
1161                 return $s;
1162         }
1163
1164         /**
1165          * Makes an object that, when expand()ed, will be the same as one obtained
1166          * with implode()
1167          *
1168          * @return array
1169          */
1170         function virtualImplode( $sep /*, ... */ ) {
1171                 $args = array_slice( func_get_args(), 1 );
1172                 $out = array();
1173                 $first = true;
1174
1175                 foreach ( $args as $root ) {
1176                         if ( $root instanceof PPNode_DOM ) {
1177                                 $root = $root->node;
1178                         }
1179                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
1180                                 $root = array( $root );
1181                         }
1182                         foreach ( $root as $node ) {
1183                                 if ( $first ) {
1184                                         $first = false;
1185                                 } else {
1186                                         $out[] = $sep;
1187                                 }
1188                                 $out[] = $node;
1189                         }
1190                 }
1191                 return $out;
1192         }
1193
1194         /**
1195          * Virtual implode with brackets
1196          */
1197         function virtualBracketedImplode( $start, $sep, $end /*, ... */ ) {
1198                 $args = array_slice( func_get_args(), 3 );
1199                 $out = array( $start );
1200                 $first = true;
1201
1202                 foreach ( $args as $root ) {
1203                         if ( $root instanceof PPNode_DOM ) {
1204                                 $root = $root->node;
1205                         }
1206                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
1207                                 $root = array( $root );
1208                         }
1209                         foreach ( $root as $node ) {
1210                                 if ( $first ) {
1211                                         $first = false;
1212                                 } else {
1213                                         $out[] = $sep;
1214                                 }
1215                                 $out[] = $node;
1216                         }
1217                 }
1218                 $out[] = $end;
1219                 return $out;
1220         }
1221
1222         function __toString() {
1223                 return 'frame{}';
1224         }
1225
1226         function getPDBK( $level = false ) {
1227                 if ( $level === false ) {
1228                         return $this->title->getPrefixedDBkey();
1229                 } else {
1230                         return isset( $this->titleCache[$level] ) ? $this->titleCache[$level] : false;
1231                 }
1232         }
1233
1234         function getArguments() {
1235                 return array();
1236         }
1237
1238         function getNumberedArguments() {
1239                 return array();
1240         }
1241
1242         function getNamedArguments() {
1243                 return array();
1244         }
1245
1246         /**
1247          * Returns true if there are no arguments in this frame
1248          */
1249         function isEmpty() {
1250                 return true;
1251         }
1252
1253         function getArgument( $name ) {
1254                 return false;
1255         }
1256
1257         /**
1258          * Returns true if the infinite loop check is OK, false if a loop is detected
1259          */
1260         function loopCheck( $title ) {
1261                 return !isset( $this->loopCheckHash[$title->getPrefixedDBkey()] );
1262         }
1263
1264         /**
1265          * Return true if the frame is a template frame
1266          */
1267         function isTemplate() {
1268                 return false;
1269         }
1270 }
1271
1272 /**
1273  * Expansion frame with template arguments
1274  * @ingroup Parser
1275  */
1276 class PPTemplateFrame_DOM extends PPFrame_DOM {
1277         var $numberedArgs, $namedArgs, $parent;
1278         var $numberedExpansionCache, $namedExpansionCache;
1279
1280         function __construct( $preprocessor, $parent = false, $numberedArgs = array(), $namedArgs = array(), $title = false ) {
1281                 parent::__construct( $preprocessor );
1282
1283                 $this->parent = $parent;
1284                 $this->numberedArgs = $numberedArgs;
1285                 $this->namedArgs = $namedArgs;
1286                 $this->title = $title;
1287                 $pdbk = $title ? $title->getPrefixedDBkey() : false;
1288                 $this->titleCache = $parent->titleCache;
1289                 $this->titleCache[] = $pdbk;
1290                 $this->loopCheckHash = /*clone*/ $parent->loopCheckHash;
1291                 if ( $pdbk !== false ) {
1292                         $this->loopCheckHash[$pdbk] = true;
1293                 }
1294                 $this->depth = $parent->depth + 1;
1295                 $this->numberedExpansionCache = $this->namedExpansionCache = array();
1296         }
1297
1298         function __toString() {
1299                 $s = 'tplframe{';
1300                 $first = true;
1301                 $args = $this->numberedArgs + $this->namedArgs;
1302                 foreach ( $args as $name => $value ) {
1303                         if ( $first ) {
1304                                 $first = false;
1305                         } else {
1306                                 $s .= ', ';
1307                         }
1308                         $s .= "\"$name\":\"" .
1309                                 str_replace( '"', '\\"', $value->ownerDocument->saveXML( $value ) ) . '"';
1310                 }
1311                 $s .= '}';
1312                 return $s;
1313         }
1314         /**
1315          * Returns true if there are no arguments in this frame
1316          */
1317         function isEmpty() {
1318                 return !count( $this->numberedArgs ) && !count( $this->namedArgs );
1319         }
1320
1321         function getArguments() {
1322                 $arguments = array();
1323                 foreach ( array_merge(
1324                                 array_keys($this->numberedArgs),
1325                                 array_keys($this->namedArgs)) as $key ) {
1326                         $arguments[$key] = $this->getArgument($key);
1327                 }
1328                 return $arguments;
1329         }
1330
1331         function getNumberedArguments() {
1332                 $arguments = array();
1333                 foreach ( array_keys($this->numberedArgs) as $key ) {
1334                         $arguments[$key] = $this->getArgument($key);
1335                 }
1336                 return $arguments;
1337         }
1338
1339         function getNamedArguments() {
1340                 $arguments = array();
1341                 foreach ( array_keys($this->namedArgs) as $key ) {
1342                         $arguments[$key] = $this->getArgument($key);
1343                 }
1344                 return $arguments;
1345         }
1346
1347         function getNumberedArgument( $index ) {
1348                 if ( !isset( $this->numberedArgs[$index] ) ) {
1349                         return false;
1350                 }
1351                 if ( !isset( $this->numberedExpansionCache[$index] ) ) {
1352                         # No trimming for unnamed arguments
1353                         $this->numberedExpansionCache[$index] = $this->parent->expand( $this->numberedArgs[$index], PPFrame::STRIP_COMMENTS );
1354                 }
1355                 return $this->numberedExpansionCache[$index];
1356         }
1357
1358         function getNamedArgument( $name ) {
1359                 if ( !isset( $this->namedArgs[$name] ) ) {
1360                         return false;
1361                 }
1362                 if ( !isset( $this->namedExpansionCache[$name] ) ) {
1363                         # Trim named arguments post-expand, for backwards compatibility
1364                         $this->namedExpansionCache[$name] = trim(
1365                                 $this->parent->expand( $this->namedArgs[$name], PPFrame::STRIP_COMMENTS ) );
1366                 }
1367                 return $this->namedExpansionCache[$name];
1368         }
1369
1370         function getArgument( $name ) {
1371                 $text = $this->getNumberedArgument( $name );
1372                 if ( $text === false ) {
1373                         $text = $this->getNamedArgument( $name );
1374                 }
1375                 return $text;
1376         }
1377
1378         /**
1379          * Return true if the frame is a template frame
1380          */
1381         function isTemplate() {
1382                 return true;
1383         }
1384 }
1385
1386 /**
1387  * Expansion frame with custom arguments
1388  * @ingroup Parser
1389  */
1390 class PPCustomFrame_DOM extends PPFrame_DOM {
1391         var $args;
1392
1393         function __construct( $preprocessor, $args ) {
1394                 parent::__construct( $preprocessor );
1395                 $this->args = $args;
1396         }
1397
1398         function __toString() {
1399                 $s = 'cstmframe{';
1400                 $first = true;
1401                 foreach ( $this->args as $name => $value ) {
1402                         if ( $first ) {
1403                                 $first = false;
1404                         } else {
1405                                 $s .= ', ';
1406                         }
1407                         $s .= "\"$name\":\"" .
1408                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1409                 }
1410                 $s .= '}';
1411                 return $s;
1412         }
1413
1414         function isEmpty() {
1415                 return !count( $this->args );
1416         }
1417
1418         function getArgument( $index ) {
1419                 if ( !isset( $this->args[$index] ) ) {
1420                         return false;
1421                 }
1422                 return $this->args[$index];
1423         }
1424 }
1425
1426 /**
1427  * @ingroup Parser
1428  */
1429 class PPNode_DOM implements PPNode {
1430         var $node, $xpath;
1431
1432         function __construct( $node, $xpath = false ) {
1433                 $this->node = $node;
1434         }
1435
1436         /**
1437          * @return DOMXPath
1438          */
1439         function getXPath() {
1440                 if ( $this->xpath === null ) {
1441                         $this->xpath = new DOMXPath( $this->node->ownerDocument );
1442                 }
1443                 return $this->xpath;
1444         }
1445
1446         function __toString() {
1447                 if ( $this->node instanceof DOMNodeList ) {
1448                         $s = '';
1449                         foreach ( $this->node as $node ) {
1450                                 $s .= $node->ownerDocument->saveXML( $node );
1451                         }
1452                 } else {
1453                         $s = $this->node->ownerDocument->saveXML( $this->node );
1454                 }
1455                 return $s;
1456         }
1457
1458         /**
1459          * @return bool|PPNode_DOM
1460          */
1461         function getChildren() {
1462                 return $this->node->childNodes ? new self( $this->node->childNodes ) : false;
1463         }
1464
1465         /**
1466          * @return bool|PPNode_DOM
1467          */
1468         function getFirstChild() {
1469                 return $this->node->firstChild ? new self( $this->node->firstChild ) : false;
1470         }
1471
1472         /**
1473          * @return bool|PPNode_DOM
1474          */
1475         function getNextSibling() {
1476                 return $this->node->nextSibling ? new self( $this->node->nextSibling ) : false;
1477         }
1478
1479         /**
1480          * @param $type
1481          *
1482          * @return bool|PPNode_DOM
1483          */
1484         function getChildrenOfType( $type ) {
1485                 return new self( $this->getXPath()->query( $type, $this->node ) );
1486         }
1487
1488         /**
1489          * @return int
1490          */
1491         function getLength() {
1492                 if ( $this->node instanceof DOMNodeList ) {
1493                         return $this->node->length;
1494                 } else {
1495                         return false;
1496                 }
1497         }
1498
1499         /**
1500          * @param $i
1501          * @return bool|PPNode_DOM
1502          */
1503         function item( $i ) {
1504                 $item = $this->node->item( $i );
1505                 return $item ? new self( $item ) : false;
1506         }
1507
1508         /**
1509          * @return string
1510          */
1511         function getName() {
1512                 if ( $this->node instanceof DOMNodeList ) {
1513                         return '#nodelist';
1514                 } else {
1515                         return $this->node->nodeName;
1516                 }
1517         }
1518
1519         /**
1520          * Split a <part> node into an associative array containing:
1521          *    name          PPNode name
1522          *    index         String index
1523          *    value         PPNode value
1524          *
1525          * @return array
1526          */
1527         function splitArg() {
1528                 $xpath = $this->getXPath();
1529                 $names = $xpath->query( 'name', $this->node );
1530                 $values = $xpath->query( 'value', $this->node );
1531                 if ( !$names->length || !$values->length ) {
1532                         throw new MWException( 'Invalid brace node passed to ' . __METHOD__ );
1533                 }
1534                 $name = $names->item( 0 );
1535                 $index = $name->getAttribute( 'index' );
1536                 return array(
1537                         'name' => new self( $name ),
1538                         'index' => $index,
1539                         'value' => new self( $values->item( 0 ) ) );
1540         }
1541
1542         /**
1543          * Split an <ext> node into an associative array containing name, attr, inner and close
1544          * All values in the resulting array are PPNodes. Inner and close are optional.
1545          *
1546          * @return array
1547          */
1548         function splitExt() {
1549                 $xpath = $this->getXPath();
1550                 $names = $xpath->query( 'name', $this->node );
1551                 $attrs = $xpath->query( 'attr', $this->node );
1552                 $inners = $xpath->query( 'inner', $this->node );
1553                 $closes = $xpath->query( 'close', $this->node );
1554                 if ( !$names->length || !$attrs->length ) {
1555                         throw new MWException( 'Invalid ext node passed to ' . __METHOD__ );
1556                 }
1557                 $parts = array(
1558                         'name' => new self( $names->item( 0 ) ),
1559                         'attr' => new self( $attrs->item( 0 ) ) );
1560                 if ( $inners->length ) {
1561                         $parts['inner'] = new self( $inners->item( 0 ) );
1562                 }
1563                 if ( $closes->length ) {
1564                         $parts['close'] = new self( $closes->item( 0 ) );
1565                 }
1566                 return $parts;
1567         }
1568
1569         /**
1570          * Split a <h> node
1571          */
1572         function splitHeading() {
1573                 if ( $this->getName() !== 'h' ) {
1574                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1575                 }
1576                 return array(
1577                         'i' => $this->node->getAttribute( 'i' ),
1578                         'level' => $this->node->getAttribute( 'level' ),
1579                         'contents' => $this->getChildren()
1580                 );
1581         }
1582 }