includes/parser/Preprocessor_Hash.php

   1 <?php
   2
   3 /**
   4  * Differences from DOM schema:
   5  *   * attribute nodes are children
   6  *   * <h> nodes that aren't at the top are replaced with <possible-h>
   7  * @ingroup Parser
   8  */
   9 class Preprocessor_Hash implements Preprocessor {
  10         var $parser;
  11
  12         const CACHE_VERSION = 1;
  13
  14         function __construct( $parser ) {
  15                 $this->parser = $parser;
  16         }
  17
  18         function newFrame() {
  19                 return new PPFrame_Hash( $this );
  20         }
  21
  22         function newCustomFrame( $args ) {
  23                 return new PPCustomFrame_Hash( $this, $args );
  24         }
  25
  26         function newPartNodeArray( $values ) {
  27                 $list = array();
  28
  29                 foreach ( $values as $k => $val ) {
  30                         $partNode = new PPNode_Hash_Tree( 'part' );
  31                         $nameNode = new PPNode_Hash_Tree( 'name' );
  32
  33                         if ( is_int( $k ) ) {
  34                                 $nameNode->addChild( new PPNode_Hash_Attr( 'index', $k ) );
  35                                 $partNode->addChild( $nameNode );
  36                         } else {
  37                                 $nameNode->addChild( new PPNode_Hash_Text( $k ) );
  38                                 $partNode->addChild( $nameNode );
  39                                 $partNode->addChild( new PPNode_Hash_Text( '=' ) );
  40                         }
  41
  42                         $valueNode = new PPNode_Hash_Tree( 'value' );
  43                         $valueNode->addChild( new PPNode_Hash_Text( $val ) );
  44                         $partNode->addChild( $valueNode );
  45
  46                         $list[] = $partNode;
  47                 }
  48
  49                 $node = new PPNode_Hash_Array( $list );
  50                 return $node;
  51         }
  52
  53         /**
  54          * Preprocess some wikitext and return the document tree.
  55          * This is the ghost of Parser::replace_variables().
  56          *
  57          * @param $text String: the text to parse
  58          * @param $flags Integer: bitwise combination of:
  59          *          Parser::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
  60          *                                     included. Default is to assume a direct page view.
  61          *
  62          * The generated DOM tree must depend only on the input text and the flags.
  63          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
  64          *
  65          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
  66          * change in the DOM tree for a given text, must be passed through the section identifier
  67          * in the section edit link and thus back to extractSections().
  68          *
  69          * The output of this function is currently only cached in process memory, but a persistent
  70          * cache may be implemented at a later date which takes further advantage of these strict
  71          * dependency requirements.
  72          *
  73          * @private
  74          */
  75         function preprocessToObj( $text, $flags = 0 ) {
  76                 wfProfileIn( __METHOD__ );
  77
  78
  79                 // Check cache.
  80                 global $wgMemc, $wgPreprocessorCacheThreshold;
  81
  82                 $cacheable = strlen( $text ) > $wgPreprocessorCacheThreshold;
  83                 if ( $cacheable ) {
  84                         wfProfileIn( __METHOD__.'-cacheable' );
  85
  86                         $cacheKey = wfMemcKey( 'preprocess-hash', md5($text), $flags );
  87                         $cacheValue = $wgMemc->get( $cacheKey );
  88                         if ( $cacheValue ) {
  89                                 $version = substr( $cacheValue, 0, 8 );
  90                                 if ( intval( $version ) == self::CACHE_VERSION ) {
  91                                         $hash = unserialize( substr( $cacheValue, 8 ) );
  92                                         // From the cache
  93                                         wfDebugLog( "Preprocessor",
  94                                                 "Loaded preprocessor hash from memcached (key $cacheKey)" );
  95                                         wfProfileOut( __METHOD__.'-cacheable' );
  96                                         wfProfileOut( __METHOD__ );
  97                                         return $hash;
  98                                 }
  99                         }
 100                         wfProfileIn( __METHOD__.'-cache-miss' );
 101                 }
 102
 103                 $rules = array(
 104                         '{' => array(
 105                                 'end' => '}',
 106                                 'names' => array(
 107                                         2 => 'template',
 108                                         3 => 'tplarg',
 109                                 ),
 110                                 'min' => 2,
 111                                 'max' => 3,
 112                         ),
 113                         '[' => array(
 114                                 'end' => ']',
 115                                 'names' => array( 2 => null ),
 116                                 'min' => 2,
 117                                 'max' => 2,
 118                         )
 119                 );
 120
 121                 $forInclusion = $flags & Parser::PTD_FOR_INCLUSION;
 122
 123                 $xmlishElements = $this->parser->getStripList();
 124                 $enableOnlyinclude = false;
 125                 if ( $forInclusion ) {
 126                         $ignoredTags = array( 'includeonly', '/includeonly' );
 127                         $ignoredElements = array( 'noinclude' );
 128                         $xmlishElements[] = 'noinclude';
 129                         if ( strpos( $text, '<onlyinclude>' ) !== false && strpos( $text, '</onlyinclude>' ) !== false ) {
 130                                 $enableOnlyinclude = true;
 131                         }
 132                 } else {
 133                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude' );
 134                         $ignoredElements = array( 'includeonly' );
 135                         $xmlishElements[] = 'includeonly';
 136                 }
 137                 $xmlishRegex = implode( '|', array_merge( $xmlishElements, $ignoredTags ) );
 138
 139                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
 140                 $elementsRegex = "~($xmlishRegex)(?:\s|\/>|>)|(!--)~iA";
 141
 142                 $stack = new PPDStack_Hash;
 143
 144                 $searchBase = "[{<\n";
 145                 $revText = strrev( $text ); // For fast reverse searches
 146
 147                 $i = 0;                     # Input pointer, starts out pointing to a pseudo-newline before the start
 148                 $accum =& $stack->getAccum();   # Current accumulator
 149                 $findEquals = false;            # True to find equals signs in arguments
 150                 $findPipe = false;              # True to take notice of pipe characters
 151                 $headingIndex = 1;
 152                 $inHeading = false;        # True if $i is inside a possible heading
 153                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
 154                 $findOnlyinclude = $enableOnlyinclude; # True to ignore all input up to the next <onlyinclude>
 155                 $fakeLineStart = true;     # Do a line-start run without outputting an LF character
 156
 157                 while ( true ) {
 158                         //$this->memCheck();
 159
 160                         if ( $findOnlyinclude ) {
 161                                 // Ignore all input up to the next <onlyinclude>
 162                                 $startPos = strpos( $text, '<onlyinclude>', $i );
 163                                 if ( $startPos === false ) {
 164                                         // Ignored section runs to the end
 165                                         $accum->addNodeWithText( 'ignore', substr( $text, $i ) );
 166                                         break;
 167                                 }
 168                                 $tagEndPos = $startPos + strlen( '<onlyinclude>' ); // past-the-end
 169                                 $accum->addNodeWithText( 'ignore', substr( $text, $i, $tagEndPos - $i ) );
 170                                 $i = $tagEndPos;
 171                                 $findOnlyinclude = false;
 172                         }
 173
 174                         if ( $fakeLineStart ) {
 175                                 $found = 'line-start';
 176                                 $curChar = '';
 177                         } else {
 178                                 # Find next opening brace, closing brace or pipe
 179                                 $search = $searchBase;
 180                                 if ( $stack->top === false ) {
 181                                         $currentClosing = '';
 182                                 } else {
 183                                         $currentClosing = $stack->top->close;
 184                                         $search .= $currentClosing;
 185                                 }
 186                                 if ( $findPipe ) {
 187                                         $search .= '|';
 188                                 }
 189                                 if ( $findEquals ) {
 190                                         // First equals will be for the template
 191                                         $search .= '=';
 192                                 }
 193                                 $rule = null;
 194                                 # Output literal section, advance input counter
 195                                 $literalLength = strcspn( $text, $search, $i );
 196                                 if ( $literalLength > 0 ) {
 197                                         $accum->addLiteral( substr( $text, $i, $literalLength ) );
 198                                         $i += $literalLength;
 199                                 }
 200                                 if ( $i >= strlen( $text ) ) {
 201                                         if ( $currentClosing == "\n" ) {
 202                                                 // Do a past-the-end run to finish off the heading
 203                                                 $curChar = '';
 204                                                 $found = 'line-end';
 205                                         } else {
 206                                                 # All done
 207                                                 break;
 208                                         }
 209                                 } else {
 210                                         $curChar = $text[$i];
 211                                         if ( $curChar == '|' ) {
 212                                                 $found = 'pipe';
 213                                         } elseif ( $curChar == '=' ) {
 214                                                 $found = 'equals';
 215                                         } elseif ( $curChar == '<' ) {
 216                                                 $found = 'angle';
 217                                         } elseif ( $curChar == "\n" ) {
 218                                                 if ( $inHeading ) {
 219                                                         $found = 'line-end';
 220                                                 } else {
 221                                                         $found = 'line-start';
 222                                                 }
 223                                         } elseif ( $curChar == $currentClosing ) {
 224                                                 $found = 'close';
 225                                         } elseif ( isset( $rules[$curChar] ) ) {
 226                                                 $found = 'open';
 227                                                 $rule = $rules[$curChar];
 228                                         } else {
 229                                                 # Some versions of PHP have a strcspn which stops on null characters
 230                                                 # Ignore and continue
 231                                                 ++$i;
 232                                                 continue;
 233                                         }
 234                                 }
 235                         }
 236
 237                         if ( $found == 'angle' ) {
 238                                 $matches = false;
 239                                 // Handle </onlyinclude>
 240                                 if ( $enableOnlyinclude && substr( $text, $i, strlen( '</onlyinclude>' ) ) == '</onlyinclude>' ) {
 241                                         $findOnlyinclude = true;
 242                                         continue;
 243                                 }
 244
 245                                 // Determine element name
 246                                 if ( !preg_match( $elementsRegex, $text, $matches, 0, $i + 1 ) ) {
 247                                         // Element name missing or not listed
 248                                         $accum->addLiteral( '<' );
 249                                         ++$i;
 250                                         continue;
 251                                 }
 252                                 // Handle comments
 253                                 if ( isset( $matches[2] ) && $matches[2] == '!--' ) {
 254                                         // To avoid leaving blank lines, when a comment is both preceded
 255                                         // and followed by a newline (ignoring spaces), trim leading and
 256                                         // trailing spaces and one of the newlines.
 257
 258                                         // Find the end
 259                                         $endPos = strpos( $text, '-->', $i + 4 );
 260                                         if ( $endPos === false ) {
 261                                                 // Unclosed comment in input, runs to end
 262                                                 $inner = substr( $text, $i );
 263                                                 $accum->addNodeWithText( 'comment', $inner );
 264                                                 $i = strlen( $text );
 265                                         } else {
 266                                                 // Search backwards for leading whitespace
 267                                                 $wsStart = $i ? ( $i - strspn( $revText, ' ', strlen( $text ) - $i ) ) : 0;
 268                                                 // Search forwards for trailing whitespace
 269                                                 // $wsEnd will be the position of the last space
 270                                                 $wsEnd = $endPos + 2 + strspn( $text, ' ', $endPos + 3 );
 271                                                 // Eat the line if possible
 272                                                 // TODO: This could theoretically be done if $wsStart == 0, i.e. for comments at
 273                                                 // the overall start. That's not how Sanitizer::removeHTMLcomments() did it, but
 274                                                 // it's a possible beneficial b/c break.
 275                                                 if ( $wsStart > 0 && substr( $text, $wsStart - 1, 1 ) == "\n"
 276                                                         && substr( $text, $wsEnd + 1, 1 ) == "\n" )
 277                                                 {
 278                                                         $startPos = $wsStart;
 279                                                         $endPos = $wsEnd + 1;
 280                                                         // Remove leading whitespace from the end of the accumulator
 281                                                         // Sanity check first though
 282                                                         $wsLength = $i - $wsStart;
 283                                                         if ( $wsLength > 0
 284                                                                 && $accum->lastNode instanceof PPNode_Hash_Text
 285                                                                 && substr( $accum->lastNode->value, -$wsLength ) === str_repeat( ' ', $wsLength ) )
 286                                                         {
 287                                                                 $accum->lastNode->value = substr( $accum->lastNode->value, 0, -$wsLength );
 288                                                         }
 289                                                         // Do a line-start run next time to look for headings after the comment
 290                                                         $fakeLineStart = true;
 291                                                 } else {
 292                                                         // No line to eat, just take the comment itself
 293                                                         $startPos = $i;
 294                                                         $endPos += 2;
 295                                                 }
 296
 297                                                 if ( $stack->top ) {
 298                                                         $part = $stack->top->getCurrentPart();
 299                                                         if ( isset( $part->commentEnd ) && $part->commentEnd == $wsStart - 1 ) {
 300                                                                 // Comments abutting, no change in visual end
 301                                                                 $part->commentEnd = $wsEnd;
 302                                                         } else {
 303                                                                 $part->visualEnd = $wsStart;
 304                                                                 $part->commentEnd = $endPos;
 305                                                         }
 306                                                 }
 307                                                 $i = $endPos + 1;
 308                                                 $inner = substr( $text, $startPos, $endPos - $startPos + 1 );
 309                                                 $accum->addNodeWithText( 'comment', $inner );
 310                                         }
 311                                         continue;
 312                                 }
 313                                 $name = $matches[1];
 314                                 $lowerName = strtolower( $name );
 315                                 $attrStart = $i + strlen( $name ) + 1;
 316
 317                                 // Find end of tag
 318                                 $tagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
 319                                 if ( $tagEndPos === false ) {
 320                                         // Infinite backtrack
 321                                         // Disable tag search to prevent worst-case O(N^2) performance
 322                                         $noMoreGT = true;
 323                                         $accum->addLiteral( '<' );
 324                                         ++$i;
 325                                         continue;
 326                                 }
 327
 328                                 // Handle ignored tags
 329                                 if ( in_array( $lowerName, $ignoredTags ) ) {
 330                                         $accum->addNodeWithText( 'ignore', substr( $text, $i, $tagEndPos - $i + 1 ) );
 331                                         $i = $tagEndPos + 1;
 332                                         continue;
 333                                 }
 334
 335                                 $tagStartPos = $i;
 336                                 if ( $text[$tagEndPos-1] == '/' ) {
 337                                         // Short end tag
 338                                         $attrEnd = $tagEndPos - 1;
 339                                         $inner = null;
 340                                         $i = $tagEndPos + 1;
 341                                         $close = null;
 342                                 } else {
 343                                         $attrEnd = $tagEndPos;
 344                                         // Find closing tag
 345                                         if ( preg_match( "/<\/" . preg_quote( $name, '/' ) . "\s*>/i",
 346                                                         $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) )
 347                                         {
 348                                                 $inner = substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 );
 349                                                 $i = $matches[0][1] + strlen( $matches[0][0] );
 350                                                 $close = $matches[0][0];
 351                                         } else {
 352                                                 // No end tag -- let it run out to the end of the text.
 353                                                 $inner = substr( $text, $tagEndPos + 1 );
 354                                                 $i = strlen( $text );
 355                                                 $close = null;
 356                                         }
 357                                 }
 358                                 // <includeonly> and <noinclude> just become <ignore> tags
 359                                 if ( in_array( $lowerName, $ignoredElements ) ) {
 360                                         $accum->addNodeWithText(  'ignore', substr( $text, $tagStartPos, $i - $tagStartPos ) );
 361                                         continue;
 362                                 }
 363
 364                                 if ( $attrEnd <= $attrStart ) {
 365                                         $attr = '';
 366                                 } else {
 367                                         // Note that the attr element contains the whitespace between name and attribute,
 368                                         // this is necessary for precise reconstruction during pre-save transform.
 369                                         $attr = substr( $text, $attrStart, $attrEnd - $attrStart );
 370                                 }
 371
 372                                 $extNode = new PPNode_Hash_Tree( 'ext' );
 373                                 $extNode->addChild( PPNode_Hash_Tree::newWithText( 'name', $name ) );
 374                                 $extNode->addChild( PPNode_Hash_Tree::newWithText( 'attr', $attr ) );
 375                                 if ( $inner !== null ) {
 376                                         $extNode->addChild( PPNode_Hash_Tree::newWithText( 'inner', $inner ) );
 377                                 }
 378                                 if ( $close !== null ) {
 379                                         $extNode->addChild( PPNode_Hash_Tree::newWithText( 'close', $close ) );
 380                                 }
 381                                 $accum->addNode( $extNode );
 382                         }
 383
 384                         elseif ( $found == 'line-start' ) {
 385                                 // Is this the start of a heading?
 386                                 // Line break belongs before the heading element in any case
 387                                 if ( $fakeLineStart ) {
 388                                         $fakeLineStart = false;
 389                                 } else {
 390                                         $accum->addLiteral( $curChar );
 391                                         $i++;
 392                                 }
 393
 394                                 $count = strspn( $text, '=', $i, 6 );
 395                                 if ( $count == 1 && $findEquals ) {
 396                                         // DWIM: This looks kind of like a name/value separator
 397                                         // Let's let the equals handler have it and break the potential heading
 398                                         // This is heuristic, but AFAICT the methods for completely correct disambiguation are very complex.
 399                                 } elseif ( $count > 0 ) {
 400                                         $piece = array(
 401                                                 'open' => "\n",
 402                                                 'close' => "\n",
 403                                                 'parts' => array( new PPDPart_Hash( str_repeat( '=', $count ) ) ),
 404                                                 'startPos' => $i,
 405                                                 'count' => $count );
 406                                         $stack->push( $piece );
 407                                         $accum =& $stack->getAccum();
 408                                         extract( $stack->getFlags() );
 409                                         $i += $count;
 410                                 }
 411                         }
 412
 413                         elseif ( $found == 'line-end' ) {
 414                                 $piece = $stack->top;
 415                                 // A heading must be open, otherwise \n wouldn't have been in the search list
 416                                 assert( $piece->open == "\n" );
 417                                 $part = $piece->getCurrentPart();
 418                                 // Search back through the input to see if it has a proper close
 419                                 // Do this using the reversed string since the other solutions (end anchor, etc.) are inefficient
 420                                 $wsLength = strspn( $revText, " \t", strlen( $text ) - $i );
 421                                 $searchStart = $i - $wsLength;
 422                                 if ( isset( $part->commentEnd ) && $searchStart - 1 == $part->commentEnd ) {
 423                                         // Comment found at line end
 424                                         // Search for equals signs before the comment
 425                                         $searchStart = $part->visualEnd;
 426                                         $searchStart -= strspn( $revText, " \t", strlen( $text ) - $searchStart );
 427                                 }
 428                                 $count = $piece->count;
 429                                 $equalsLength = strspn( $revText, '=', strlen( $text ) - $searchStart );
 430                                 if ( $equalsLength > 0 ) {
 431                                         if ( $searchStart - $equalsLength == $piece->startPos ) {
 432                                                 // This is just a single string of equals signs on its own line
 433                                                 // Replicate the doHeadings behaviour /={count}(.+)={count}/
 434                                                 // First find out how many equals signs there really are (don't stop at 6)
 435                                                 $count = $equalsLength;
 436                                                 if ( $count < 3 ) {
 437                                                         $count = 0;
 438                                                 } else {
 439                                                         $count = min( 6, intval( ( $count - 1 ) / 2 ) );
 440                                                 }
 441                                         } else {
 442                                                 $count = min( $equalsLength, $count );
 443                                         }
 444                                         if ( $count > 0 ) {
 445                                                 // Normal match, output <h>
 446                                                 $element = new PPNode_Hash_Tree( 'possible-h' );
 447                                                 $element->addChild( new PPNode_Hash_Attr( 'level', $count ) );
 448                                                 $element->addChild( new PPNode_Hash_Attr( 'i', $headingIndex++ ) );
 449                                                 $element->lastChild->nextSibling = $accum->firstNode;
 450                                                 $element->lastChild = $accum->lastNode;
 451                                         } else {
 452                                                 // Single equals sign on its own line, count=0
 453                                                 $element = $accum;
 454                                         }
 455                                 } else {
 456                                         // No match, no <h>, just pass down the inner text
 457                                         $element = $accum;
 458                                 }
 459                                 // Unwind the stack
 460                                 $stack->pop();
 461                                 $accum =& $stack->getAccum();
 462                                 extract( $stack->getFlags() );
 463
 464                                 // Append the result to the enclosing accumulator
 465                                 if ( $element instanceof PPNode ) {
 466                                         $accum->addNode( $element );
 467                                 } else {
 468                                         $accum->addAccum( $element );
 469                                 }
 470                                 // Note that we do NOT increment the input pointer.
 471                                 // This is because the closing linebreak could be the opening linebreak of
 472                                 // another heading. Infinite loops are avoided because the next iteration MUST
 473                                 // hit the heading open case above, which unconditionally increments the
 474                                 // input pointer.
 475                         }
 476
 477                         elseif ( $found == 'open' ) {
 478                                 # count opening brace characters
 479                                 $count = strspn( $text, $curChar, $i );
 480
 481                                 # we need to add to stack only if opening brace count is enough for one of the rules
 482                                 if ( $count >= $rule['min'] ) {
 483                                         # Add it to the stack
 484                                         $piece = array(
 485                                                 'open' => $curChar,
 486                                                 'close' => $rule['end'],
 487                                                 'count' => $count,
 488                                                 'lineStart' => ($i > 0 && $text[$i-1] == "\n"),
 489                                         );
 490
 491                                         $stack->push( $piece );
 492                                         $accum =& $stack->getAccum();
 493                                         extract( $stack->getFlags() );
 494                                 } else {
 495                                         # Add literal brace(s)
 496                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 497                                 }
 498                                 $i += $count;
 499                         }
 500
 501                         elseif ( $found == 'close' ) {
 502                                 $piece = $stack->top;
 503                                 # lets check if there are enough characters for closing brace
 504                                 $maxCount = $piece->count;
 505                                 $count = strspn( $text, $curChar, $i, $maxCount );
 506
 507                                 # check for maximum matching characters (if there are 5 closing
 508                                 # characters, we will probably need only 3 - depending on the rules)
 509                                 $matchingCount = 0;
 510                                 $rule = $rules[$piece->open];
 511                                 if ( $count > $rule['max'] ) {
 512                                         # The specified maximum exists in the callback array, unless the caller
 513                                         # has made an error
 514                                         $matchingCount = $rule['max'];
 515                                 } else {
 516                                         # Count is less than the maximum
 517                                         # Skip any gaps in the callback array to find the true largest match
 518                                         # Need to use array_key_exists not isset because the callback can be null
 519                                         $matchingCount = $count;
 520                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
 521                                                 --$matchingCount;
 522                                         }
 523                                 }
 524
 525                                 if ($matchingCount <= 0) {
 526                                         # No matching element found in callback array
 527                                         # Output a literal closing brace and continue
 528                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 529                                         $i += $count;
 530                                         continue;
 531                                 }
 532                                 $name = $rule['names'][$matchingCount];
 533                                 if ( $name === null ) {
 534                                         // No element, just literal text
 535                                         $element = $piece->breakSyntax( $matchingCount );
 536                                         $element->addLiteral( str_repeat( $rule['end'], $matchingCount ) );
 537                                 } else {
 538                                         # Create XML element
 539                                         # Note: $parts is already XML, does not need to be encoded further
 540                                         $parts = $piece->parts;
 541                                         $titleAccum = $parts[0]->out;
 542                                         unset( $parts[0] );
 543
 544                                         $element = new PPNode_Hash_Tree( $name );
 545
 546                                         # The invocation is at the start of the line if lineStart is set in
 547                                         # the stack, and all opening brackets are used up.
 548                                         if ( $maxCount == $matchingCount && !empty( $piece->lineStart ) ) {
 549                                                 $element->addChild( new PPNode_Hash_Attr( 'lineStart', 1 ) );
 550                                         }
 551                                         $titleNode = new PPNode_Hash_Tree( 'title' );
 552                                         $titleNode->firstChild = $titleAccum->firstNode;
 553                                         $titleNode->lastChild = $titleAccum->lastNode;
 554                                         $element->addChild( $titleNode );
 555                                         $argIndex = 1;
 556                                         foreach ( $parts as $partIndex => $part ) {
 557                                                 if ( isset( $part->eqpos ) ) {
 558                                                         // Find equals
 559                                                         $lastNode = false;
 560                                                         for ( $node = $part->out->firstNode; $node; $node = $node->nextSibling ) {
 561                                                                 if ( $node === $part->eqpos ) {
 562                                                                         break;
 563                                                                 }
 564                                                                 $lastNode = $node;
 565                                                         }
 566                                                         if ( !$node ) {
 567                                                                 throw new MWException( __METHOD__. ': eqpos not found' );
 568                                                         }
 569                                                         if ( $node->name !== 'equals' ) {
 570                                                                 throw new MWException( __METHOD__ .': eqpos is not equals' );
 571                                                         }
 572                                                         $equalsNode = $node;
 573
 574                                                         // Construct name node
 575                                                         $nameNode = new PPNode_Hash_Tree( 'name' );
 576                                                         if ( $lastNode !== false ) {
 577                                                                 $lastNode->nextSibling = false;
 578                                                                 $nameNode->firstChild = $part->out->firstNode;
 579                                                                 $nameNode->lastChild = $lastNode;
 580                                                         }
 581
 582                                                         // Construct value node
 583                                                         $valueNode = new PPNode_Hash_Tree( 'value' );
 584                                                         if ( $equalsNode->nextSibling !== false ) {
 585                                                                 $valueNode->firstChild = $equalsNode->nextSibling;
 586                                                                 $valueNode->lastChild = $part->out->lastNode;
 587                                                         }
 588                                                         $partNode = new PPNode_Hash_Tree( 'part' );
 589                                                         $partNode->addChild( $nameNode );
 590                                                         $partNode->addChild( $equalsNode->firstChild );
 591                                                         $partNode->addChild( $valueNode );
 592                                                         $element->addChild( $partNode );
 593                                                 } else {
 594                                                         $partNode = new PPNode_Hash_Tree( 'part' );
 595                                                         $nameNode = new PPNode_Hash_Tree( 'name' );
 596                                                         $nameNode->addChild( new PPNode_Hash_Attr( 'index', $argIndex++ ) );
 597                                                         $valueNode = new PPNode_Hash_Tree( 'value' );
 598                                                         $valueNode->firstChild = $part->out->firstNode;
 599                                                         $valueNode->lastChild = $part->out->lastNode;
 600                                                         $partNode->addChild( $nameNode );
 601                                                         $partNode->addChild( $valueNode );
 602                                                         $element->addChild( $partNode );
 603                                                 }
 604                                         }
 605                                 }
 606
 607                                 # Advance input pointer
 608                                 $i += $matchingCount;
 609
 610                                 # Unwind the stack
 611                                 $stack->pop();
 612                                 $accum =& $stack->getAccum();
 613
 614                                 # Re-add the old stack element if it still has unmatched opening characters remaining
 615                                 if ($matchingCount < $piece->count) {
 616                                         $piece->parts = array( new PPDPart_Hash );
 617                                         $piece->count -= $matchingCount;
 618                                         # do we still qualify for any callback with remaining count?
 619                                         $names = $rules[$piece->open]['names'];
 620                                         $skippedBraces = 0;
 621                                         $enclosingAccum =& $accum;
 622                                         while ( $piece->count ) {
 623                                                 if ( array_key_exists( $piece->count, $names ) ) {
 624                                                         $stack->push( $piece );
 625                                                         $accum =& $stack->getAccum();
 626                                                         break;
 627                                                 }
 628                                                 --$piece->count;
 629                                                 $skippedBraces ++;
 630                                         }
 631                                         $enclosingAccum->addLiteral( str_repeat( $piece->open, $skippedBraces ) );
 632                                 }
 633
 634                                 extract( $stack->getFlags() );
 635
 636                                 # Add XML element to the enclosing accumulator
 637                                 if ( $element instanceof PPNode ) {
 638                                         $accum->addNode( $element );
 639                                 } else {
 640                                         $accum->addAccum( $element );
 641                                 }
 642                         }
 643
 644                         elseif ( $found == 'pipe' ) {
 645                                 $findEquals = true; // shortcut for getFlags()
 646                                 $stack->addPart();
 647                                 $accum =& $stack->getAccum();
 648                                 ++$i;
 649                         }
 650
 651                         elseif ( $found == 'equals' ) {
 652                                 $findEquals = false; // shortcut for getFlags()
 653                                 $accum->addNodeWithText( 'equals', '=' );
 654                                 $stack->getCurrentPart()->eqpos = $accum->lastNode;
 655                                 ++$i;
 656                         }
 657                 }
 658
 659                 # Output any remaining unclosed brackets
 660                 foreach ( $stack->stack as $piece ) {
 661                         $stack->rootAccum->addAccum( $piece->breakSyntax() );
 662                 }
 663
 664                 # Enable top-level headings
 665                 for ( $node = $stack->rootAccum->firstNode; $node; $node = $node->nextSibling ) {
 666                         if ( isset( $node->name ) && $node->name === 'possible-h' ) {
 667                                 $node->name = 'h';
 668                         }
 669                 }
 670
 671                 $rootNode = new PPNode_Hash_Tree( 'root' );
 672                 $rootNode->firstChild = $stack->rootAccum->firstNode;
 673                 $rootNode->lastChild = $stack->rootAccum->lastNode;
 674
 675                 // Cache
 676                 if ($cacheable) {
 677                         $cacheValue = sprintf( "%08d", self::CACHE_VERSION ) . serialize( $rootNode );;
 678                         $wgMemc->set( $cacheKey, $cacheValue, 86400 );
 679                         wfProfileOut( __METHOD__.'-cache-miss' );
 680                         wfProfileOut( __METHOD__.'-cacheable' );
 681                         wfDebugLog( "Preprocessor", "Saved preprocessor Hash to memcached (key $cacheKey)" );
 682                 }
 683
 684                 wfProfileOut( __METHOD__ );
 685                 return $rootNode;
 686         }
 687 }
 688
 689 /**
 690  * Stack class to help Preprocessor::preprocessToObj()
 691  * @ingroup Parser
 692  */
 693 class PPDStack_Hash extends PPDStack {
 694         function __construct() {
 695                 $this->elementClass = 'PPDStackElement_Hash';
 696                 parent::__construct();
 697                 $this->rootAccum = new PPDAccum_Hash;
 698         }
 699 }
 700
 701 /**
 702  * @ingroup Parser
 703  */
 704 class PPDStackElement_Hash extends PPDStackElement {
 705         function __construct( $data = array() ) {
 706                 $this->partClass = 'PPDPart_Hash';
 707                 parent::__construct( $data );
 708         }
 709
 710         /**
 711          * Get the accumulator that would result if the close is not found.
 712          */
 713         function breakSyntax( $openingCount = false ) {
 714                 if ( $this->open == "\n" ) {
 715                         $accum = $this->parts[0]->out;
 716                 } else {
 717                         if ( $openingCount === false ) {
 718                                 $openingCount = $this->count;
 719                         }
 720                         $accum = new PPDAccum_Hash;
 721                         $accum->addLiteral( str_repeat( $this->open, $openingCount ) );
 722                         $first = true;
 723                         foreach ( $this->parts as $part ) {
 724                                 if ( $first ) {
 725                                         $first = false;
 726                                 } else {
 727                                         $accum->addLiteral( '|' );
 728                                 }
 729                                 $accum->addAccum( $part->out );
 730                         }
 731                 }
 732                 return $accum;
 733         }
 734 }
 735
 736 /**
 737  * @ingroup Parser
 738  */
 739 class PPDPart_Hash extends PPDPart {
 740         function __construct( $out = '' ) {
 741                 $accum = new PPDAccum_Hash;
 742                 if ( $out !== '' ) {
 743                         $accum->addLiteral( $out );
 744                 }
 745                 parent::__construct( $accum );
 746         }
 747 }
 748
 749 /**
 750  * @ingroup Parser
 751  */
 752 class PPDAccum_Hash {
 753         var $firstNode, $lastNode;
 754
 755         function __construct() {
 756                 $this->firstNode = $this->lastNode = false;
 757         }
 758
 759         /**
 760          * Append a string literal
 761          */
 762         function addLiteral( $s ) {
 763                 if ( $this->lastNode === false ) {
 764                         $this->firstNode = $this->lastNode = new PPNode_Hash_Text( $s );
 765                 } elseif ( $this->lastNode instanceof PPNode_Hash_Text ) {
 766                         $this->lastNode->value .= $s;
 767                 } else {
 768                         $this->lastNode->nextSibling = new PPNode_Hash_Text( $s );
 769                         $this->lastNode = $this->lastNode->nextSibling;
 770                 }
 771         }
 772
 773         /**
 774          * Append a PPNode
 775          */
 776         function addNode( PPNode $node ) {
 777                 if ( $this->lastNode === false ) {
 778                         $this->firstNode = $this->lastNode = $node;
 779                 } else {
 780                         $this->lastNode->nextSibling = $node;
 781                         $this->lastNode = $node;
 782                 }
 783         }
 784
 785         /**
 786          * Append a tree node with text contents
 787          */
 788         function addNodeWithText( $name, $value ) {
 789                 $node = PPNode_Hash_Tree::newWithText( $name, $value );
 790                 $this->addNode( $node );
 791         }
 792
 793         /**
 794          * Append a PPAccum_Hash
 795          * Takes over ownership of the nodes in the source argument. These nodes may
 796          * subsequently be modified, especially nextSibling.
 797          */
 798         function addAccum( $accum ) {
 799                 if ( $accum->lastNode === false ) {
 800                         // nothing to add
 801                 } elseif ( $this->lastNode === false ) {
 802                         $this->firstNode = $accum->firstNode;
 803                         $this->lastNode = $accum->lastNode;
 804                 } else {
 805                         $this->lastNode->nextSibling = $accum->firstNode;
 806                         $this->lastNode = $accum->lastNode;
 807                 }
 808         }
 809 }
 810
 811 /**
 812  * An expansion frame, used as a context to expand the result of preprocessToObj()
 813  * @ingroup Parser
 814  */
 815 class PPFrame_Hash implements PPFrame {
 816         var $preprocessor, $parser, $title;
 817         var $titleCache;
 818
 819         /**
 820          * Hashtable listing templates which are disallowed for expansion in this frame,
 821          * having been encountered previously in parent frames.
 822          */
 823         var $loopCheckHash;
 824
 825         /**
 826          * Recursion depth of this frame, top = 0
 827          * Note that this is NOT the same as expansion depth in expand()
 828          */
 829         var $depth;
 830
 831
 832         /**
 833          * Construct a new preprocessor frame.
 834          * @param $preprocessor Preprocessor: the parent preprocessor
 835          */
 836         function __construct( $preprocessor ) {
 837                 $this->preprocessor = $preprocessor;
 838                 $this->parser = $preprocessor->parser;
 839                 $this->title = $this->parser->mTitle;
 840                 $this->titleCache = array( $this->title ? $this->title->getPrefixedDBkey() : false );
 841                 $this->loopCheckHash = array();
 842                 $this->depth = 0;
 843         }
 844
 845         /**
 846          * Create a new child frame
 847          * $args is optionally a multi-root PPNode or array containing the template arguments
 848          */
 849         function newChild( $args = false, $title = false ) {
 850                 $namedArgs = array();
 851                 $numberedArgs = array();
 852                 if ( $title === false ) {
 853                         $title = $this->title;
 854                 }
 855                 if ( $args !== false ) {
 856                         if ( $args instanceof PPNode_Hash_Array ) {
 857                                 $args = $args->value;
 858                         } elseif ( !is_array( $args ) ) {
 859                                 throw new MWException( __METHOD__ . ': $args must be array or PPNode_Hash_Array' );
 860                         }
 861                         foreach ( $args as $arg ) {
 862                                 $bits = $arg->splitArg();
 863                                 if ( $bits['index'] !== '' ) {
 864                                         // Numbered parameter
 865                                         $numberedArgs[$bits['index']] = $bits['value'];
 866                                         unset( $namedArgs[$bits['index']] );
 867                                 } else {
 868                                         // Named parameter
 869                                         $name = trim( $this->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 870                                         $namedArgs[$name] = $bits['value'];
 871                                         unset( $numberedArgs[$name] );
 872                                 }
 873                         }
 874                 }
 875                 return new PPTemplateFrame_Hash( $this->preprocessor, $this, $numberedArgs, $namedArgs, $title );
 876         }
 877
 878         function expand( $root, $flags = 0 ) {
 879                 static $expansionDepth = 0;
 880                 if ( is_string( $root ) ) {
 881                         return $root;
 882                 }
 883
 884                 if ( ++$this->parser->mPPNodeCount > $this->parser->mOptions->getMaxPPNodeCount() )
 885                 {
 886                         return '<span class="error">Node-count limit exceeded</span>';
 887                 }
 888                 if ( $expansionDepth > $this->parser->mOptions->getMaxPPExpandDepth() ) {
 889                         return '<span class="error">Expansion depth limit exceeded</span>';
 890                 }
 891                 ++$expansionDepth;
 892
 893                 $outStack = array( '', '' );
 894                 $iteratorStack = array( false, $root );
 895                 $indexStack = array( 0, 0 );
 896
 897                 while ( count( $iteratorStack ) > 1 ) {
 898                         $level = count( $outStack ) - 1;
 899                         $iteratorNode =& $iteratorStack[ $level ];
 900                         $out =& $outStack[$level];
 901                         $index =& $indexStack[$level];
 902
 903                         if ( is_array( $iteratorNode ) ) {
 904                                 if ( $index >= count( $iteratorNode ) ) {
 905                                         // All done with this iterator
 906                                         $iteratorStack[$level] = false;
 907                                         $contextNode = false;
 908                                 } else {
 909                                         $contextNode = $iteratorNode[$index];
 910                                         $index++;
 911                                 }
 912                         } elseif ( $iteratorNode instanceof PPNode_Hash_Array ) {
 913                                 if ( $index >= $iteratorNode->getLength() ) {
 914                                         // All done with this iterator
 915                                         $iteratorStack[$level] = false;
 916                                         $contextNode = false;
 917                                 } else {
 918                                         $contextNode = $iteratorNode->item( $index );
 919                                         $index++;
 920                                 }
 921                         } else {
 922                                 // Copy to $contextNode and then delete from iterator stack,
 923                                 // because this is not an iterator but we do have to execute it once
 924                                 $contextNode = $iteratorStack[$level];
 925                                 $iteratorStack[$level] = false;
 926                         }
 927
 928                         $newIterator = false;
 929
 930                         if ( $contextNode === false ) {
 931                                 // nothing to do
 932                         } elseif ( is_string( $contextNode ) ) {
 933                                 $out .= $contextNode;
 934                         } elseif ( is_array( $contextNode ) || $contextNode instanceof PPNode_Hash_Array ) {
 935                                 $newIterator = $contextNode;
 936                         } elseif ( $contextNode instanceof PPNode_Hash_Attr ) {
 937                                 // No output
 938                         } elseif ( $contextNode instanceof PPNode_Hash_Text ) {
 939                                 $out .= $contextNode->value;
 940                         } elseif ( $contextNode instanceof PPNode_Hash_Tree ) {
 941                                 if ( $contextNode->name == 'template' ) {
 942                                         # Double-brace expansion
 943                                         $bits = $contextNode->splitTemplate();
 944                                         if ( $flags & PPFrame::NO_TEMPLATES ) {
 945                                                 $newIterator = $this->virtualBracketedImplode( '{{', '|', '}}', $bits['title'], $bits['parts'] );
 946                                         } else {
 947                                                 $ret = $this->parser->braceSubstitution( $bits, $this );
 948                                                 if ( isset( $ret['object'] ) ) {
 949                                                         $newIterator = $ret['object'];
 950                                                 } else {
 951                                                         $out .= $ret['text'];
 952                                                 }
 953                                         }
 954                                 } elseif ( $contextNode->name == 'tplarg' ) {
 955                                         # Triple-brace expansion
 956                                         $bits = $contextNode->splitTemplate();
 957                                         if ( $flags & PPFrame::NO_ARGS ) {
 958                                                 $newIterator = $this->virtualBracketedImplode( '{{{', '|', '}}}', $bits['title'], $bits['parts'] );
 959                                         } else {
 960                                                 $ret = $this->parser->argSubstitution( $bits, $this );
 961                                                 if ( isset( $ret['object'] ) ) {
 962                                                         $newIterator = $ret['object'];
 963                                                 } else {
 964                                                         $out .= $ret['text'];
 965                                                 }
 966                                         }
 967                                 } elseif ( $contextNode->name == 'comment' ) {
 968                                         # HTML-style comment
 969                                         # Remove it in HTML, pre+remove and STRIP_COMMENTS modes
 970                                         if ( $this->parser->ot['html']
 971                                                 || ( $this->parser->ot['pre'] && $this->parser->mOptions->getRemoveComments() )
 972                                                 || ( $flags & PPFrame::STRIP_COMMENTS ) )
 973                                         {
 974                                                 $out .= '';
 975                                         }
 976                                         # Add a strip marker in PST mode so that pstPass2() can run some old-fashioned regexes on the result
 977                                         # Not in RECOVER_COMMENTS mode (extractSections) though
 978                                         elseif ( $this->parser->ot['wiki'] && ! ( $flags & PPFrame::RECOVER_COMMENTS ) ) {
 979                                                 $out .= $this->parser->insertStripItem( $contextNode->firstChild->value );
 980                                         }
 981                                         # Recover the literal comment in RECOVER_COMMENTS and pre+no-remove
 982                                         else {
 983                                                 $out .= $contextNode->firstChild->value;
 984                                         }
 985                                 } elseif ( $contextNode->name == 'ignore' ) {
 986                                         # Output suppression used by <includeonly> etc.
 987                                         # OT_WIKI will only respect <ignore> in substed templates.
 988                                         # The other output types respect it unless NO_IGNORE is set.
 989                                         # extractSections() sets NO_IGNORE and so never respects it.
 990                                         if ( ( !isset( $this->parent ) && $this->parser->ot['wiki'] ) || ( $flags & PPFrame::NO_IGNORE ) ) {
 991                                                 $out .= $contextNode->firstChild->value;
 992                                         } else {
 993                                                 //$out .= '';
 994                                         }
 995                                 } elseif ( $contextNode->name == 'ext' ) {
 996                                         # Extension tag
 997                                         $bits = $contextNode->splitExt() + array( 'attr' => null, 'inner' => null, 'close' => null );
 998                                         $out .= $this->parser->extensionSubstitution( $bits, $this );
 999                                 } elseif ( $contextNode->name == 'h' ) {
1000                                         # Heading
1001                                         if ( $this->parser->ot['html'] ) {
1002                                                 # Expand immediately and insert heading index marker
1003                                                 $s = '';
1004                                                 for ( $node = $contextNode->firstChild; $node; $node = $node->nextSibling ) {
1005                                                         $s .= $this->expand( $node, $flags );
1006                                                 }
1007
1008                                                 $bits = $contextNode->splitHeading();
1009                                                 $titleText = $this->title->getPrefixedDBkey();
1010                                                 $this->parser->mHeadings[] = array( $titleText, $bits['i'] );
1011                                                 $serial = count( $this->parser->mHeadings ) - 1;
1012                                                 $marker = "{$this->parser->mUniqPrefix}-h-$serial-" . Parser::MARKER_SUFFIX;
1013                                                 $s = substr( $s, 0, $bits['level'] ) . $marker . substr( $s, $bits['level'] );
1014                                                 $this->parser->mStripState->general->setPair( $marker, '' );
1015                                                 $out .= $s;
1016                                         } else {
1017                                                 # Expand in virtual stack
1018                                                 $newIterator = $contextNode->getChildren();
1019                                         }
1020                                 } else {
1021                                         # Generic recursive expansion
1022                                         $newIterator = $contextNode->getChildren();
1023                                 }
1024                         } else {
1025                                 throw new MWException( __METHOD__.': Invalid parameter type' );
1026                         }
1027
1028                         if ( $newIterator !== false ) {
1029                                 $outStack[] = '';
1030                                 $iteratorStack[] = $newIterator;
1031                                 $indexStack[] = 0;
1032                         } elseif ( $iteratorStack[$level] === false ) {
1033                                 // Return accumulated value to parent
1034                                 // With tail recursion
1035                                 while ( $iteratorStack[$level] === false && $level > 0 ) {
1036                                         $outStack[$level - 1] .= $out;
1037                                         array_pop( $outStack );
1038                                         array_pop( $iteratorStack );
1039                                         array_pop( $indexStack );
1040                                         $level--;
1041                                 }
1042                         }
1043                 }
1044                 --$expansionDepth;
1045                 return $outStack[0];
1046         }
1047
1048         function implodeWithFlags( $sep, $flags /*, ... */ ) {
1049                 $args = array_slice( func_get_args(), 2 );
1050
1051                 $first = true;
1052                 $s = '';
1053                 foreach ( $args as $root ) {
1054                         if ( $root instanceof PPNode_Hash_Array ) {
1055                                 $root = $root->value;
1056                         }
1057                         if ( !is_array( $root ) ) {
1058                                 $root = array( $root );
1059                         }
1060                         foreach ( $root as $node ) {
1061                                 if ( $first ) {
1062                                         $first = false;
1063                                 } else {
1064                                         $s .= $sep;
1065                                 }
1066                                 $s .= $this->expand( $node, $flags );
1067                         }
1068                 }
1069                 return $s;
1070         }
1071
1072         /**
1073          * Implode with no flags specified
1074          * This previously called implodeWithFlags but has now been inlined to reduce stack depth
1075          */
1076         function implode( $sep /*, ... */ ) {
1077                 $args = array_slice( func_get_args(), 1 );
1078
1079                 $first = true;
1080                 $s = '';
1081                 foreach ( $args as $root ) {
1082                         if ( $root instanceof PPNode_Hash_Array ) {
1083                                 $root = $root->value;
1084                         }
1085                         if ( !is_array( $root ) ) {
1086                                 $root = array( $root );
1087                         }
1088                         foreach ( $root as $node ) {
1089                                 if ( $first ) {
1090                                         $first = false;
1091                                 } else {
1092                                         $s .= $sep;
1093                                 }
1094                                 $s .= $this->expand( $node );
1095                         }
1096                 }
1097                 return $s;
1098         }
1099
1100         /**
1101          * Makes an object that, when expand()ed, will be the same as one obtained
1102          * with implode()
1103          */
1104         function virtualImplode( $sep /*, ... */ ) {
1105                 $args = array_slice( func_get_args(), 1 );
1106                 $out = array();
1107                 $first = true;
1108
1109                 foreach ( $args as $root ) {
1110                         if ( $root instanceof PPNode_Hash_Array ) {
1111                                 $root = $root->value;
1112                         }
1113                         if ( !is_array( $root ) ) {
1114                                 $root = array( $root );
1115                         }
1116                         foreach ( $root as $node ) {
1117                                 if ( $first ) {
1118                                         $first = false;
1119                                 } else {
1120                                         $out[] = $sep;
1121                                 }
1122                                 $out[] = $node;
1123                         }
1124                 }
1125                 return new PPNode_Hash_Array( $out );
1126         }
1127
1128         /**
1129          * Virtual implode with brackets
1130          */
1131         function virtualBracketedImplode( $start, $sep, $end /*, ... */ ) {
1132                 $args = array_slice( func_get_args(), 3 );
1133                 $out = array( $start );
1134                 $first = true;
1135
1136                 foreach ( $args as $root ) {
1137                         if ( $root instanceof PPNode_Hash_Array ) {
1138                                 $root = $root->value;
1139                         }
1140                         if ( !is_array( $root ) ) {
1141                                 $root = array( $root );
1142                         }
1143                         foreach ( $root as $node ) {
1144                                 if ( $first ) {
1145                                         $first = false;
1146                                 } else {
1147                                         $out[] = $sep;
1148                                 }
1149                                 $out[] = $node;
1150                         }
1151                 }
1152                 $out[] = $end;
1153                 return new PPNode_Hash_Array( $out );
1154         }
1155
1156         function __toString() {
1157                 return 'frame{}';
1158         }
1159
1160         function getPDBK( $level = false ) {
1161                 if ( $level === false ) {
1162                         return $this->title->getPrefixedDBkey();
1163                 } else {
1164                         return isset( $this->titleCache[$level] ) ? $this->titleCache[$level] : false;
1165                 }
1166         }
1167
1168         function getArguments() {
1169                 return array();
1170         }
1171
1172         function getNumberedArguments() {
1173                 return array();
1174         }
1175
1176         function getNamedArguments() {
1177                 return array();
1178         }
1179
1180         /**
1181          * Returns true if there are no arguments in this frame
1182          */
1183         function isEmpty() {
1184                 return true;
1185         }
1186
1187         function getArgument( $name ) {
1188                 return false;
1189         }
1190
1191         /**
1192          * Returns true if the infinite loop check is OK, false if a loop is detected
1193          */
1194         function loopCheck( $title ) {
1195                 return !isset( $this->loopCheckHash[$title->getPrefixedDBkey()] );
1196         }
1197
1198         /**
1199          * Return true if the frame is a template frame
1200          */
1201         function isTemplate() {
1202                 return false;
1203         }
1204 }
1205
1206 /**
1207  * Expansion frame with template arguments
1208  * @ingroup Parser
1209  */
1210 class PPTemplateFrame_Hash extends PPFrame_Hash {
1211         var $numberedArgs, $namedArgs, $parent;
1212         var $numberedExpansionCache, $namedExpansionCache;
1213
1214         function __construct( $preprocessor, $parent = false, $numberedArgs = array(), $namedArgs = array(), $title = false ) {
1215                 parent::__construct( $preprocessor );
1216
1217                 $this->parent = $parent;
1218                 $this->numberedArgs = $numberedArgs;
1219                 $this->namedArgs = $namedArgs;
1220                 $this->title = $title;
1221                 $pdbk = $title ? $title->getPrefixedDBkey() : false;
1222                 $this->titleCache = $parent->titleCache;
1223                 $this->titleCache[] = $pdbk;
1224                 $this->loopCheckHash = /*clone*/ $parent->loopCheckHash;
1225                 if ( $pdbk !== false ) {
1226                         $this->loopCheckHash[$pdbk] = true;
1227                 }
1228                 $this->depth = $parent->depth + 1;
1229                 $this->numberedExpansionCache = $this->namedExpansionCache = array();
1230         }
1231
1232         function __toString() {
1233                 $s = 'tplframe{';
1234                 $first = true;
1235                 $args = $this->numberedArgs + $this->namedArgs;
1236                 foreach ( $args as $name => $value ) {
1237                         if ( $first ) {
1238                                 $first = false;
1239                         } else {
1240                                 $s .= ', ';
1241                         }
1242                         $s .= "\"$name\":\"" .
1243                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1244                 }
1245                 $s .= '}';
1246                 return $s;
1247         }
1248         /**
1249          * Returns true if there are no arguments in this frame
1250          */
1251         function isEmpty() {
1252                 return !count( $this->numberedArgs ) && !count( $this->namedArgs );
1253         }
1254
1255         function getArguments() {
1256                 $arguments = array();
1257                 foreach ( array_merge(
1258                                 array_keys($this->numberedArgs),
1259                                 array_keys($this->namedArgs)) as $key ) {
1260                         $arguments[$key] = $this->getArgument($key);
1261                 }
1262                 return $arguments;
1263         }
1264
1265         function getNumberedArguments() {
1266                 $arguments = array();
1267                 foreach ( array_keys($this->numberedArgs) as $key ) {
1268                         $arguments[$key] = $this->getArgument($key);
1269                 }
1270                 return $arguments;
1271         }
1272
1273         function getNamedArguments() {
1274                 $arguments = array();
1275                 foreach ( array_keys($this->namedArgs) as $key ) {
1276                         $arguments[$key] = $this->getArgument($key);
1277                 }
1278                 return $arguments;
1279         }
1280
1281         function getNumberedArgument( $index ) {
1282                 if ( !isset( $this->numberedArgs[$index] ) ) {
1283                         return false;
1284                 }
1285                 if ( !isset( $this->numberedExpansionCache[$index] ) ) {
1286                         # No trimming for unnamed arguments
1287                         $this->numberedExpansionCache[$index] = $this->parent->expand( $this->numberedArgs[$index], PPFrame::STRIP_COMMENTS );
1288                 }
1289                 return $this->numberedExpansionCache[$index];
1290         }
1291
1292         function getNamedArgument( $name ) {
1293                 if ( !isset( $this->namedArgs[$name] ) ) {
1294                         return false;
1295                 }
1296                 if ( !isset( $this->namedExpansionCache[$name] ) ) {
1297                         # Trim named arguments post-expand, for backwards compatibility
1298                         $this->namedExpansionCache[$name] = trim(
1299                                 $this->parent->expand( $this->namedArgs[$name], PPFrame::STRIP_COMMENTS ) );
1300                 }
1301                 return $this->namedExpansionCache[$name];
1302         }
1303
1304         function getArgument( $name ) {
1305                 $text = $this->getNumberedArgument( $name );
1306                 if ( $text === false ) {
1307                         $text = $this->getNamedArgument( $name );
1308                 }
1309                 return $text;
1310         }
1311
1312         /**
1313          * Return true if the frame is a template frame
1314          */
1315         function isTemplate() {
1316                 return true;
1317         }
1318 }
1319
1320 /**
1321  * Expansion frame with custom arguments
1322  * @ingroup Parser
1323  */
1324 class PPCustomFrame_Hash extends PPFrame_Hash {
1325         var $args;
1326
1327         function __construct( $preprocessor, $args ) {
1328                 parent::__construct( $preprocessor );
1329                 $this->args = $args;
1330         }
1331
1332         function __toString() {
1333                 $s = 'cstmframe{';
1334                 $first = true;
1335                 foreach ( $this->args as $name => $value ) {
1336                         if ( $first ) {
1337                                 $first = false;
1338                         } else {
1339                                 $s .= ', ';
1340                         }
1341                         $s .= "\"$name\":\"" .
1342                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1343                 }
1344                 $s .= '}';
1345                 return $s;
1346         }
1347
1348         function isEmpty() {
1349                 return !count( $this->args );
1350         }
1351
1352         function getArgument( $index ) {
1353                 if ( !isset( $this->args[$index] ) ) {
1354                         return false;
1355                 }
1356                 return $this->args[$index];
1357         }
1358 }
1359
1360 /**
1361  * @ingroup Parser
1362  */
1363 class PPNode_Hash_Tree implements PPNode {
1364         var $name, $firstChild, $lastChild, $nextSibling;
1365
1366         function __construct( $name ) {
1367                 $this->name = $name;
1368                 $this->firstChild = $this->lastChild = $this->nextSibling = false;
1369         }
1370
1371         function __toString() {
1372                 $inner = '';
1373                 $attribs = '';
1374                 for ( $node = $this->firstChild; $node; $node = $node->nextSibling ) {
1375                         if ( $node instanceof PPNode_Hash_Attr ) {
1376                                 $attribs .= ' ' . $node->name . '="' . htmlspecialchars( $node->value ) . '"';
1377                         } else {
1378                                 $inner .= $node->__toString();
1379                         }
1380                 }
1381                 if ( $inner === '' ) {
1382                         return "<{$this->name}$attribs/>";
1383                 } else {
1384                         return "<{$this->name}$attribs>$inner</{$this->name}>";
1385                 }
1386         }
1387
1388         static function newWithText( $name, $text ) {
1389                 $obj = new self( $name );
1390                 $obj->addChild( new PPNode_Hash_Text( $text ) );
1391                 return $obj;
1392         }
1393
1394         function addChild( $node ) {
1395                 if ( $this->lastChild === false ) {
1396                         $this->firstChild = $this->lastChild = $node;
1397                 } else {
1398                         $this->lastChild->nextSibling = $node;
1399                         $this->lastChild = $node;
1400                 }
1401         }
1402
1403         function getChildren() {
1404                 $children = array();
1405                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1406                         $children[] = $child;
1407                 }
1408                 return new PPNode_Hash_Array( $children );
1409         }
1410
1411         function getFirstChild() {
1412                 return $this->firstChild;
1413         }
1414
1415         function getNextSibling() {
1416                 return $this->nextSibling;
1417         }
1418
1419         function getChildrenOfType( $name ) {
1420                 $children = array();
1421                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1422                         if ( isset( $child->name ) && $child->name === $name ) {
1423                                 $children[] = $name;
1424                         }
1425                 }
1426                 return $children;
1427         }
1428
1429         function getLength() { return false; }
1430         function item( $i ) { return false; }
1431
1432         function getName() {
1433                 return $this->name;
1434         }
1435
1436         /**
1437          * Split a <part> node into an associative array containing:
1438          *    name          PPNode name
1439          *    index         String index
1440          *    value         PPNode value
1441          */
1442         function splitArg() {
1443                 $bits = array();
1444                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1445                         if ( !isset( $child->name ) ) {
1446                                 continue;
1447                         }
1448                         if ( $child->name === 'name' ) {
1449                                 $bits['name'] = $child;
1450                                 if ( $child->firstChild instanceof PPNode_Hash_Attr
1451                                         && $child->firstChild->name === 'index' )
1452                                 {
1453                                         $bits['index'] = $child->firstChild->value;
1454                                 }
1455                         } elseif ( $child->name === 'value' ) {
1456                                 $bits['value'] = $child;
1457                         }
1458                 }
1459
1460                 if ( !isset( $bits['name'] ) ) {
1461                         throw new MWException( 'Invalid brace node passed to ' . __METHOD__ );
1462                 }
1463                 if ( !isset( $bits['index'] ) ) {
1464                         $bits['index'] = '';
1465                 }
1466                 return $bits;
1467         }
1468
1469         /**
1470          * Split an <ext> node into an associative array containing name, attr, inner and close
1471          * All values in the resulting array are PPNodes. Inner and close are optional.
1472          */
1473         function splitExt() {
1474                 $bits = array();
1475                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1476                         if ( !isset( $child->name ) ) {
1477                                 continue;
1478                         }
1479                         if ( $child->name == 'name' ) {
1480                                 $bits['name'] = $child;
1481                         } elseif ( $child->name == 'attr' ) {
1482                                 $bits['attr'] = $child;
1483                         } elseif ( $child->name == 'inner' ) {
1484                                 $bits['inner'] = $child;
1485                         } elseif ( $child->name == 'close' ) {
1486                                 $bits['close'] = $child;
1487                         }
1488                 }
1489                 if ( !isset( $bits['name'] ) ) {
1490                         throw new MWException( 'Invalid ext node passed to ' . __METHOD__ );
1491                 }
1492                 return $bits;
1493         }
1494
1495         /**
1496          * Split an <h> node
1497          */
1498         function splitHeading() {
1499                 if ( $this->name !== 'h' ) {
1500                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1501                 }
1502                 $bits = array();
1503                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1504                         if ( !isset( $child->name ) ) {
1505                                 continue;
1506                         }
1507                         if ( $child->name == 'i' ) {
1508                                 $bits['i'] = $child->value;
1509                         } elseif ( $child->name == 'level' ) {
1510                                 $bits['level'] = $child->value;
1511                         }
1512                 }
1513                 if ( !isset( $bits['i'] ) ) {
1514                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1515                 }
1516                 return $bits;
1517         }
1518
1519         /**
1520          * Split a <template> or <tplarg> node
1521          */
1522         function splitTemplate() {
1523                 $parts = array();
1524                 $bits = array( 'lineStart' => '' );
1525                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1526                         if ( !isset( $child->name ) ) {
1527                                 continue;
1528                         }
1529                         if ( $child->name == 'title' ) {
1530                                 $bits['title'] = $child;
1531                         }
1532                         if ( $child->name == 'part' ) {
1533                                 $parts[] = $child;
1534                         }
1535                         if ( $child->name == 'lineStart' ) {
1536                                 $bits['lineStart'] = '1';
1537                         }
1538                 }
1539                 if ( !isset( $bits['title'] ) ) {
1540                         throw new MWException( 'Invalid node passed to ' . __METHOD__ );
1541                 }
1542                 $bits['parts'] = new PPNode_Hash_Array( $parts );
1543                 return $bits;
1544         }
1545 }
1546
1547 /**
1548  * @ingroup Parser
1549  */
1550 class PPNode_Hash_Text implements PPNode {
1551         var $value, $nextSibling;
1552
1553         function __construct( $value ) {
1554                 if ( is_object( $value ) ) {
1555                         throw new MWException( __CLASS__ . ' given object instead of string' );
1556                 }
1557                 $this->value = $value;
1558         }
1559
1560         function __toString() {
1561                 return htmlspecialchars( $this->value );
1562         }
1563
1564         function getNextSibling() {
1565                 return $this->nextSibling;
1566         }
1567
1568         function getChildren() { return false; }
1569         function getFirstChild() { return false; }
1570         function getChildrenOfType( $name ) { return false; }
1571         function getLength() { return false; }
1572         function item( $i ) { return false; }
1573         function getName() { return '#text'; }
1574         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1575         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1576         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1577 }
1578
1579 /**
1580  * @ingroup Parser
1581  */
1582 class PPNode_Hash_Array implements PPNode {
1583         var $value, $nextSibling;
1584
1585         function __construct( $value ) {
1586                 $this->value = $value;
1587         }
1588
1589         function __toString() {
1590                 return var_export( $this, true );
1591         }
1592
1593         function getLength() {
1594                 return count( $this->value );
1595         }
1596
1597         function item( $i ) {
1598                 return $this->value[$i];
1599         }
1600
1601         function getName() { return '#nodelist'; }
1602
1603         function getNextSibling() {
1604                 return $this->nextSibling;
1605         }
1606
1607         function getChildren() { return false; }
1608         function getFirstChild() { return false; }
1609         function getChildrenOfType( $name ) { return false; }
1610         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1611         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1612         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1613 }
1614
1615 /**
1616  * @ingroup Parser
1617  */
1618 class PPNode_Hash_Attr implements PPNode {
1619         var $name, $value, $nextSibling;
1620
1621         function __construct( $name, $value ) {
1622                 $this->name = $name;
1623                 $this->value = $value;
1624         }
1625
1626         function __toString() {
1627                 return "<@{$this->name}>" . htmlspecialchars( $this->value ) . "</@{$this->name}>";
1628         }
1629
1630         function getName() {
1631                 return $this->name;
1632         }
1633
1634         function getNextSibling() {
1635                 return $this->nextSibling;
1636         }
1637
1638         function getChildren() { return false; }
1639         function getFirstChild() { return false; }
1640         function getChildrenOfType( $name ) { return false; }
1641         function getLength() { return false; }
1642         function item( $i ) { return false; }
1643         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1644         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1645         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1646 }