includes/parser/Preprocessor_Hash.php

   1 <?php
   2 /**
   3  * Preprocessor using PHP arrays
   4  *
   5  * @file
   6  * @ingroup Parser
   7  */
   8
   9 /**
  10  * Differences from DOM schema:
  11  *   * attribute nodes are children
  12  *   * <h> nodes that aren't at the top are replaced with <possible-h>
  13  * @ingroup Parser
  14  */
  15 class Preprocessor_Hash implements Preprocessor {
  16         var $parser;
  17
  18         const CACHE_VERSION = 1;
  19
  20         function __construct( $parser ) {
  21                 $this->parser = $parser;
  22         }
  23
  24         function newFrame() {
  25                 return new PPFrame_Hash( $this );
  26         }
  27
  28         function newCustomFrame( $args ) {
  29                 return new PPCustomFrame_Hash( $this, $args );
  30         }
  31
  32         function newPartNodeArray( $values ) {
  33                 $list = array();
  34
  35                 foreach ( $values as $k => $val ) {
  36                         $partNode = new PPNode_Hash_Tree( 'part' );
  37                         $nameNode = new PPNode_Hash_Tree( 'name' );
  38
  39                         if ( is_int( $k ) ) {
  40                                 $nameNode->addChild( new PPNode_Hash_Attr( 'index', $k ) );
  41                                 $partNode->addChild( $nameNode );
  42                         } else {
  43                                 $nameNode->addChild( new PPNode_Hash_Text( $k ) );
  44                                 $partNode->addChild( $nameNode );
  45                                 $partNode->addChild( new PPNode_Hash_Text( '=' ) );
  46                         }
  47
  48                         $valueNode = new PPNode_Hash_Tree( 'value' );
  49                         $valueNode->addChild( new PPNode_Hash_Text( $val ) );
  50                         $partNode->addChild( $valueNode );
  51
  52                         $list[] = $partNode;
  53                 }
  54
  55                 $node = new PPNode_Hash_Array( $list );
  56                 return $node;
  57         }
  58
  59         /**
  60          * Preprocess some wikitext and return the document tree.
  61          * This is the ghost of Parser::replace_variables().
  62          *
  63          * @param $text String: the text to parse
  64          * @param $flags Integer: bitwise combination of:
  65          *          Parser::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
  66          *                                     included. Default is to assume a direct page view.
  67          *
  68          * The generated DOM tree must depend only on the input text and the flags.
  69          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
  70          *
  71          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
  72          * change in the DOM tree for a given text, must be passed through the section identifier
  73          * in the section edit link and thus back to extractSections().
  74          *
  75          * The output of this function is currently only cached in process memory, but a persistent
  76          * cache may be implemented at a later date which takes further advantage of these strict
  77          * dependency requirements.
  78          *
  79          * @private
  80          */
  81         function preprocessToObj( $text, $flags = 0 ) {
  82                 wfProfileIn( __METHOD__ );
  83
  84
  85                 // Check cache.
  86                 global $wgMemc, $wgPreprocessorCacheThreshold;
  87
  88                 $cacheable = strlen( $text ) > $wgPreprocessorCacheThreshold;
  89                 if ( $cacheable ) {
  90                         wfProfileIn( __METHOD__.'-cacheable' );
  91
  92                         $cacheKey = wfMemcKey( 'preprocess-hash', md5($text), $flags );
  93                         $cacheValue = $wgMemc->get( $cacheKey );
  94                         if ( $cacheValue ) {
  95                                 $version = substr( $cacheValue, 0, 8 );
  96                                 if ( intval( $version ) == self::CACHE_VERSION ) {
  97                                         $hash = unserialize( substr( $cacheValue, 8 ) );
  98                                         // From the cache
  99                                         wfDebugLog( "Preprocessor",
 100                                                 "Loaded preprocessor hash from memcached (key $cacheKey)" );
 101                                         wfProfileOut( __METHOD__.'-cacheable' );
 102                                         wfProfileOut( __METHOD__ );
 103                                         return $hash;
 104                                 }
 105                         }
 106                         wfProfileIn( __METHOD__.'-cache-miss' );
 107                 }
 108
 109                 $rules = array(
 110                         '{' => array(
 111                                 'end' => '}',
 112                                 'names' => array(
 113                                         2 => 'template',
 114                                         3 => 'tplarg',
 115                                 ),
 116                                 'min' => 2,
 117                                 'max' => 3,
 118                         ),
 119                         '[' => array(
 120                                 'end' => ']',
 121                                 'names' => array( 2 => null ),
 122                                 'min' => 2,
 123                                 'max' => 2,
 124                         )
 125                 );
 126
 127                 $forInclusion = $flags & Parser::PTD_FOR_INCLUSION;
 128
 129                 $xmlishElements = $this->parser->getStripList();
 130                 $enableOnlyinclude = false;
 131                 if ( $forInclusion ) {
 132                         $ignoredTags = array( 'includeonly', '/includeonly' );
 133                         $ignoredElements = array( 'noinclude' );
 134                         $xmlishElements[] = 'noinclude';
 135                         if ( strpos( $text, '<onlyinclude>' ) !== false && strpos( $text, '</onlyinclude>' ) !== false ) {
 136                                 $enableOnlyinclude = true;
 137                         }
 138                 } else {
 139                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude' );
 140                         $ignoredElements = array( 'includeonly' );
 141                         $xmlishElements[] = 'includeonly';
 142                 }
 143                 $xmlishRegex = implode( '|', array_merge( $xmlishElements, $ignoredTags ) );
 144
 145                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
 146                 $elementsRegex = "~($xmlishRegex)(?:\s|\/>|>)|(!--)~iA";
 147
 148                 $stack = new PPDStack_Hash;
 149
 150                 $searchBase = "[{<\n";
 151                 $revText = strrev( $text ); // For fast reverse searches
 152
 153                 $i = 0;                     # Input pointer, starts out pointing to a pseudo-newline before the start
 154                 $accum =& $stack->getAccum();   # Current accumulator
 155                 $findEquals = false;            # True to find equals signs in arguments
 156                 $findPipe = false;              # True to take notice of pipe characters
 157                 $headingIndex = 1;
 158                 $inHeading = false;        # True if $i is inside a possible heading
 159                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
 160                 $findOnlyinclude = $enableOnlyinclude; # True to ignore all input up to the next <onlyinclude>
 161                 $fakeLineStart = true;     # Do a line-start run without outputting an LF character
 162
 163                 while ( true ) {
 164                         //$this->memCheck();
 165
 166                         if ( $findOnlyinclude ) {
 167                                 // Ignore all input up to the next <onlyinclude>
 168                                 $startPos = strpos( $text, '<onlyinclude>', $i );
 169                                 if ( $startPos === false ) {
 170                                         // Ignored section runs to the end
 171                                         $accum->addNodeWithText( 'ignore', substr( $text, $i ) );
 172                                         break;
 173                                 }
 174                                 $tagEndPos = $startPos + strlen( '<onlyinclude>' ); // past-the-end
 175                                 $accum->addNodeWithText( 'ignore', substr( $text, $i, $tagEndPos - $i ) );
 176                                 $i = $tagEndPos;
 177                                 $findOnlyinclude = false;
 178                         }
 179
 180                         if ( $fakeLineStart ) {
 181                                 $found = 'line-start';
 182                                 $curChar = '';
 183                         } else {
 184                                 # Find next opening brace, closing brace or pipe
 185                                 $search = $searchBase;
 186                                 if ( $stack->top === false ) {
 187                                         $currentClosing = '';
 188                                 } else {
 189                                         $currentClosing = $stack->top->close;
 190                                         $search .= $currentClosing;
 191                                 }
 192                                 if ( $findPipe ) {
 193                                         $search .= '|';
 194                                 }
 195                                 if ( $findEquals ) {
 196                                         // First equals will be for the template
 197                                         $search .= '=';
 198                                 }
 199                                 $rule = null;
 200                                 # Output literal section, advance input counter
 201                                 $literalLength = strcspn( $text, $search, $i );
 202                                 if ( $literalLength > 0 ) {
 203                                         $accum->addLiteral( substr( $text, $i, $literalLength ) );
 204                                         $i += $literalLength;
 205                                 }
 206                                 if ( $i >= strlen( $text ) ) {
 207                                         if ( $currentClosing == "\n" ) {
 208                                                 // Do a past-the-end run to finish off the heading
 209                                                 $curChar = '';
 210                                                 $found = 'line-end';
 211                                         } else {
 212                                                 # All done
 213                                                 break;
 214                                         }
 215                                 } else {
 216                                         $curChar = $text[$i];
 217                                         if ( $curChar == '|' ) {
 218                                                 $found = 'pipe';
 219                                         } elseif ( $curChar == '=' ) {
 220                                                 $found = 'equals';
 221                                         } elseif ( $curChar == '<' ) {
 222                                                 $found = 'angle';
 223                                         } elseif ( $curChar == "\n" ) {
 224                                                 if ( $inHeading ) {
 225                                                         $found = 'line-end';
 226                                                 } else {
 227                                                         $found = 'line-start';
 228                                                 }
 229                                         } elseif ( $curChar == $currentClosing ) {
 230                                                 $found = 'close';
 231                                         } elseif ( isset( $rules[$curChar] ) ) {
 232                                                 $found = 'open';
 233                                                 $rule = $rules[$curChar];
 234                                         } else {
 235                                                 # Some versions of PHP have a strcspn which stops on null characters
 236                                                 # Ignore and continue
 237                                                 ++$i;
 238                                                 continue;
 239                                         }
 240                                 }
 241                         }
 242
 243                         if ( $found == 'angle' ) {
 244                                 $matches = false;
 245                                 // Handle </onlyinclude>
 246                                 if ( $enableOnlyinclude && substr( $text, $i, strlen( '</onlyinclude>' ) ) == '</onlyinclude>' ) {
 247                                         $findOnlyinclude = true;
 248                                         continue;
 249                                 }
 250
 251                                 // Determine element name
 252                                 if ( !preg_match( $elementsRegex, $text, $matches, 0, $i + 1 ) ) {
 253                                         // Element name missing or not listed
 254                                         $accum->addLiteral( '<' );
 255                                         ++$i;
 256                                         continue;
 257                                 }
 258                                 // Handle comments
 259                                 if ( isset( $matches[2] ) && $matches[2] == '!--' ) {
 260                                         // To avoid leaving blank lines, when a comment is both preceded
 261                                         // and followed by a newline (ignoring spaces), trim leading and
 262                                         // trailing spaces and one of the newlines.
 263
 264                                         // Find the end
 265                                         $endPos = strpos( $text, '-->', $i + 4 );
 266                                         if ( $endPos === false ) {
 267                                                 // Unclosed comment in input, runs to end
 268                                                 $inner = substr( $text, $i );
 269                                                 $accum->addNodeWithText( 'comment', $inner );
 270                                                 $i = strlen( $text );
 271                                         } else {
 272                                                 // Search backwards for leading whitespace
 273                                                 $wsStart = $i ? ( $i - strspn( $revText, ' ', strlen( $text ) - $i ) ) : 0;
 274                                                 // Search forwards for trailing whitespace
 275                                                 // $wsEnd will be the position of the last space
 276                                                 $wsEnd = $endPos + 2 + strspn( $text, ' ', $endPos + 3 );
 277                                                 // Eat the line if possible
 278                                                 // TODO: This could theoretically be done if $wsStart == 0, i.e. for comments at
 279                                                 // the overall start. That's not how Sanitizer::removeHTMLcomments() did it, but
 280                                                 // it's a possible beneficial b/c break.
 281                                                 if ( $wsStart > 0 && substr( $text, $wsStart - 1, 1 ) == "\n"
 282                                                         && substr( $text, $wsEnd + 1, 1 ) == "\n" )
 283                                                 {
 284                                                         $startPos = $wsStart;
 285                                                         $endPos = $wsEnd + 1;
 286                                                         // Remove leading whitespace from the end of the accumulator
 287                                                         // Sanity check first though
 288                                                         $wsLength = $i - $wsStart;
 289                                                         if ( $wsLength > 0
 290                                                                 && $accum->lastNode instanceof PPNode_Hash_Text
 291                                                                 && substr( $accum->lastNode->value, -$wsLength ) === str_repeat( ' ', $wsLength ) )
 292                                                         {
 293                                                                 $accum->lastNode->value = substr( $accum->lastNode->value, 0, -$wsLength );
 294                                                         }
 295                                                         // Do a line-start run next time to look for headings after the comment
 296                                                         $fakeLineStart = true;
 297                                                 } else {
 298                                                         // No line to eat, just take the comment itself
 299                                                         $startPos = $i;
 300                                                         $endPos += 2;
 301                                                 }
 302
 303                                                 if ( $stack->top ) {
 304                                                         $part = $stack->top->getCurrentPart();
 305                                                         if ( isset( $part->commentEnd ) && $part->commentEnd == $wsStart - 1 ) {
 306                                                                 // Comments abutting, no change in visual end
 307                                                                 $part->commentEnd = $wsEnd;
 308                                                         } else {
 309                                                                 $part->visualEnd = $wsStart;
 310                                                                 $part->commentEnd = $endPos;
 311                                                         }
 312                                                 }
 313                                                 $i = $endPos + 1;
 314                                                 $inner = substr( $text, $startPos, $endPos - $startPos + 1 );
 315                                                 $accum->addNodeWithText( 'comment', $inner );
 316                                         }
 317                                         continue;
 318                                 }
 319                                 $name = $matches[1];
 320                                 $lowerName = strtolower( $name );
 321                                 $attrStart = $i + strlen( $name ) + 1;
 322
 323                                 // Find end of tag
 324                                 $tagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
 325                                 if ( $tagEndPos === false ) {
 326                                         // Infinite backtrack
 327                                         // Disable tag search to prevent worst-case O(N^2) performance
 328                                         $noMoreGT = true;
 329                                         $accum->addLiteral( '<' );
 330                                         ++$i;
 331                                         continue;
 332                                 }
 333
 334                                 // Handle ignored tags
 335                                 if ( in_array( $lowerName, $ignoredTags ) ) {
 336                                         $accum->addNodeWithText( 'ignore', substr( $text, $i, $tagEndPos - $i + 1 ) );
 337                                         $i = $tagEndPos + 1;
 338                                         continue;
 339                                 }
 340
 341                                 $tagStartPos = $i;
 342                                 if ( $text[$tagEndPos-1] == '/' ) {
 343                                         // Short end tag
 344                                         $attrEnd = $tagEndPos - 1;
 345                                         $inner = null;
 346                                         $i = $tagEndPos + 1;
 347                                         $close = null;
 348                                 } else {
 349                                         $attrEnd = $tagEndPos;
 350                                         // Find closing tag
 351                                         if ( preg_match( "/<\/" . preg_quote( $name, '/' ) . "\s*>/i",
 352                                                         $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) )
 353                                         {
 354                                                 $inner = substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 );
 355                                                 $i = $matches[0][1] + strlen( $matches[0][0] );
 356                                                 $close = $matches[0][0];
 357                                         } else {
 358                                                 // No end tag -- let it run out to the end of the text.
 359                                                 $inner = substr( $text, $tagEndPos + 1 );
 360                                                 $i = strlen( $text );
 361                                                 $close = null;
 362                                         }
 363                                 }
 364                                 // <includeonly> and <noinclude> just become <ignore> tags
 365                                 if ( in_array( $lowerName, $ignoredElements ) ) {
 366                                         $accum->addNodeWithText(  'ignore', substr( $text, $tagStartPos, $i - $tagStartPos ) );
 367                                         continue;
 368                                 }
 369
 370                                 if ( $attrEnd <= $attrStart ) {
 371                                         $attr = '';
 372                                 } else {
 373                                         // Note that the attr element contains the whitespace between name and attribute,
 374                                         // this is necessary for precise reconstruction during pre-save transform.
 375                                         $attr = substr( $text, $attrStart, $attrEnd - $attrStart );
 376                                 }
 377
 378                                 $extNode = new PPNode_Hash_Tree( 'ext' );
 379                                 $extNode->addChild( PPNode_Hash_Tree::newWithText( 'name', $name ) );
 380                                 $extNode->addChild( PPNode_Hash_Tree::newWithText( 'attr', $attr ) );
 381                                 if ( $inner !== null ) {
 382                                         $extNode->addChild( PPNode_Hash_Tree::newWithText( 'inner', $inner ) );
 383                                 }
 384                                 if ( $close !== null ) {
 385                                         $extNode->addChild( PPNode_Hash_Tree::newWithText( 'close', $close ) );
 386                                 }
 387                                 $accum->addNode( $extNode );
 388                         }
 389
 390                         elseif ( $found == 'line-start' ) {
 391                                 // Is this the start of a heading?
 392                                 // Line break belongs before the heading element in any case
 393                                 if ( $fakeLineStart ) {
 394                                         $fakeLineStart = false;
 395                                 } else {
 396                                         $accum->addLiteral( $curChar );
 397                                         $i++;
 398                                 }
 399
 400                                 $count = strspn( $text, '=', $i, 6 );
 401                                 if ( $count == 1 && $findEquals ) {
 402                                         // DWIM: This looks kind of like a name/value separator
 403                                         // Let's let the equals handler have it and break the potential heading
 404                                         // This is heuristic, but AFAICT the methods for completely correct disambiguation are very complex.
 405                                 } elseif ( $count > 0 ) {
 406                                         $piece = array(
 407                                                 'open' => "\n",
 408                                                 'close' => "\n",
 409                                                 'parts' => array( new PPDPart_Hash( str_repeat( '=', $count ) ) ),
 410                                                 'startPos' => $i,
 411                                                 'count' => $count );
 412                                         $stack->push( $piece );
 413                                         $accum =& $stack->getAccum();
 414                                         extract( $stack->getFlags() );
 415                                         $i += $count;
 416                                 }
 417                         }
 418
 419                         elseif ( $found == 'line-end' ) {
 420                                 $piece = $stack->top;
 421                                 // A heading must be open, otherwise \n wouldn't have been in the search list
 422                                 assert( $piece->open == "\n" );
 423                                 $part = $piece->getCurrentPart();
 424                                 // Search back through the input to see if it has a proper close
 425                                 // Do this using the reversed string since the other solutions (end anchor, etc.) are inefficient
 426                                 $wsLength = strspn( $revText, " \t", strlen( $text ) - $i );
 427                                 $searchStart = $i - $wsLength;
 428                                 if ( isset( $part->commentEnd ) && $searchStart - 1 == $part->commentEnd ) {
 429                                         // Comment found at line end
 430                                         // Search for equals signs before the comment
 431                                         $searchStart = $part->visualEnd;
 432                                         $searchStart -= strspn( $revText, " \t", strlen( $text ) - $searchStart );
 433                                 }
 434                                 $count = $piece->count;
 435                                 $equalsLength = strspn( $revText, '=', strlen( $text ) - $searchStart );
 436                                 if ( $equalsLength > 0 ) {
 437                                         if ( $searchStart - $equalsLength == $piece->startPos ) {
 438                                                 // This is just a single string of equals signs on its own line
 439                                                 // Replicate the doHeadings behaviour /={count}(.+)={count}/
 440                                                 // First find out how many equals signs there really are (don't stop at 6)
 441                                                 $count = $equalsLength;
 442                                                 if ( $count < 3 ) {
 443                                                         $count = 0;
 444                                                 } else {
 445                                                         $count = min( 6, intval( ( $count - 1 ) / 2 ) );
 446                                                 }
 447                                         } else {
 448                                                 $count = min( $equalsLength, $count );
 449                                         }
 450                                         if ( $count > 0 ) {
 451                                                 // Normal match, output <h>
 452                                                 $element = new PPNode_Hash_Tree( 'possible-h' );
 453                                                 $element->addChild( new PPNode_Hash_Attr( 'level', $count ) );
 454                                                 $element->addChild( new PPNode_Hash_Attr( 'i', $headingIndex++ ) );
 455                                                 $element->lastChild->nextSibling = $accum->firstNode;
 456                                                 $element->lastChild = $accum->lastNode;
 457                                         } else {
 458                                                 // Single equals sign on its own line, count=0
 459                                                 $element = $accum;
 460                                         }
 461                                 } else {
 462                                         // No match, no <h>, just pass down the inner text
 463                                         $element = $accum;
 464                                 }
 465                                 // Unwind the stack
 466                                 $stack->pop();
 467                                 $accum =& $stack->getAccum();
 468                                 extract( $stack->getFlags() );
 469
 470                                 // Append the result to the enclosing accumulator
 471                                 if ( $element instanceof PPNode ) {
 472                                         $accum->addNode( $element );
 473                                 } else {
 474                                         $accum->addAccum( $element );
 475                                 }
 476                                 // Note that we do NOT increment the input pointer.
 477                                 // This is because the closing linebreak could be the opening linebreak of
 478                                 // another heading. Infinite loops are avoided because the next iteration MUST
 479                                 // hit the heading open case above, which unconditionally increments the
 480                                 // input pointer.
 481                         }
 482
 483                         elseif ( $found == 'open' ) {
 484                                 # count opening brace characters
 485                                 $count = strspn( $text, $curChar, $i );
 486
 487                                 # we need to add to stack only if opening brace count is enough for one of the rules
 488                                 if ( $count >= $rule['min'] ) {
 489                                         # Add it to the stack
 490                                         $piece = array(
 491                                                 'open' => $curChar,
 492                                                 'close' => $rule['end'],
 493                                                 'count' => $count,
 494                                                 'lineStart' => ($i > 0 && $text[$i-1] == "\n"),
 495                                         );
 496
 497                                         $stack->push( $piece );
 498                                         $accum =& $stack->getAccum();
 499                                         extract( $stack->getFlags() );
 500                                 } else {
 501                                         # Add literal brace(s)
 502                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 503                                 }
 504                                 $i += $count;
 505                         }
 506
 507                         elseif ( $found == 'close' ) {
 508                                 $piece = $stack->top;
 509                                 # lets check if there are enough characters for closing brace
 510                                 $maxCount = $piece->count;
 511                                 $count = strspn( $text, $curChar, $i, $maxCount );
 512
 513                                 # check for maximum matching characters (if there are 5 closing
 514                                 # characters, we will probably need only 3 - depending on the rules)
 515                                 $rule = $rules[$piece->open];
 516                                 if ( $count > $rule['max'] ) {
 517                                         # The specified maximum exists in the callback array, unless the caller
 518                                         # has made an error
 519                                         $matchingCount = $rule['max'];
 520                                 } else {
 521                                         # Count is less than the maximum
 522                                         # Skip any gaps in the callback array to find the true largest match
 523                                         # Need to use array_key_exists not isset because the callback can be null
 524                                         $matchingCount = $count;
 525                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
 526                                                 --$matchingCount;
 527                                         }
 528                                 }
 529
 530                                 if ($matchingCount <= 0) {
 531                                         # No matching element found in callback array
 532                                         # Output a literal closing brace and continue
 533                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 534                                         $i += $count;
 535                                         continue;
 536                                 }
 537                                 $name = $rule['names'][$matchingCount];
 538                                 if ( $name === null ) {
 539                                         // No element, just literal text
 540                                         $element = $piece->breakSyntax( $matchingCount );
 541                                         $element->addLiteral( str_repeat( $rule['end'], $matchingCount ) );
 542                                 } else {
 543                                         # Create XML element
 544                                         # Note: $parts is already XML, does not need to be encoded further
 545                                         $parts = $piece->parts;
 546                                         $titleAccum = $parts[0]->out;
 547                                         unset( $parts[0] );
 548
 549                                         $element = new PPNode_Hash_Tree( $name );
 550
 551                                         # The invocation is at the start of the line if lineStart is set in
 552                                         # the stack, and all opening brackets are used up.
 553                                         if ( $maxCount == $matchingCount && !empty( $piece->lineStart ) ) {
 554                                                 $element->addChild( new PPNode_Hash_Attr( 'lineStart', 1 ) );
 555                                         }
 556                                         $titleNode = new PPNode_Hash_Tree( 'title' );
 557                                         $titleNode->firstChild = $titleAccum->firstNode;
 558                                         $titleNode->lastChild = $titleAccum->lastNode;
 559                                         $element->addChild( $titleNode );
 560                                         $argIndex = 1;
 561                                         foreach ( $parts as $part ) {
 562                                                 if ( isset( $part->eqpos ) ) {
 563                                                         // Find equals
 564                                                         $lastNode = false;
 565                                                         for ( $node = $part->out->firstNode; $node; $node = $node->nextSibling ) {
 566                                                                 if ( $node === $part->eqpos ) {
 567                                                                         break;
 568                                                                 }
 569                                                                 $lastNode = $node;
 570                                                         }
 571                                                         if ( !$node ) {
 572                                                                 throw new MWException( __METHOD__. ': eqpos not found' );
 573                                                         }
 574                                                         if ( $node->name !== 'equals' ) {
 575                                                                 throw new MWException( __METHOD__ .': eqpos is not equals' );
 576                                                         }
 577                                                         $equalsNode = $node;
 578
 579                                                         // Construct name node
 580                                                         $nameNode = new PPNode_Hash_Tree( 'name' );
 581                                                         if ( $lastNode !== false ) {
 582                                                                 $lastNode->nextSibling = false;
 583                                                                 $nameNode->firstChild = $part->out->firstNode;
 584                                                                 $nameNode->lastChild = $lastNode;
 585                                                         }
 586
 587                                                         // Construct value node
 588                                                         $valueNode = new PPNode_Hash_Tree( 'value' );
 589                                                         if ( $equalsNode->nextSibling !== false ) {
 590                                                                 $valueNode->firstChild = $equalsNode->nextSibling;
 591                                                                 $valueNode->lastChild = $part->out->lastNode;
 592                                                         }
 593                                                         $partNode = new PPNode_Hash_Tree( 'part' );
 594                                                         $partNode->addChild( $nameNode );
 595                                                         $partNode->addChild( $equalsNode->firstChild );
 596                                                         $partNode->addChild( $valueNode );
 597                                                         $element->addChild( $partNode );
 598                                                 } else {
 599                                                         $partNode = new PPNode_Hash_Tree( 'part' );
 600                                                         $nameNode = new PPNode_Hash_Tree( 'name' );
 601                                                         $nameNode->addChild( new PPNode_Hash_Attr( 'index', $argIndex++ ) );
 602                                                         $valueNode = new PPNode_Hash_Tree( 'value' );
 603                                                         $valueNode->firstChild = $part->out->firstNode;
 604                                                         $valueNode->lastChild = $part->out->lastNode;
 605                                                         $partNode->addChild( $nameNode );
 606                                                         $partNode->addChild( $valueNode );
 607                                                         $element->addChild( $partNode );
 608                                                 }
 609                                         }
 610                                 }
 611
 612                                 # Advance input pointer
 613                                 $i += $matchingCount;
 614
 615                                 # Unwind the stack
 616                                 $stack->pop();
 617                                 $accum =& $stack->getAccum();
 618
 619                                 # Re-add the old stack element if it still has unmatched opening characters remaining
 620                                 if ($matchingCount < $piece->count) {
 621                                         $piece->parts = array( new PPDPart_Hash );
 622                                         $piece->count -= $matchingCount;
 623                                         # do we still qualify for any callback with remaining count?
 624                                         $names = $rules[$piece->open]['names'];
 625                                         $skippedBraces = 0;
 626                                         $enclosingAccum =& $accum;
 627                                         while ( $piece->count ) {
 628                                                 if ( array_key_exists( $piece->count, $names ) ) {
 629                                                         $stack->push( $piece );
 630                                                         $accum =& $stack->getAccum();
 631                                                         break;
 632                                                 }
 633                                                 --$piece->count;
 634                                                 $skippedBraces ++;
 635                                         }
 636                                         $enclosingAccum->addLiteral( str_repeat( $piece->open, $skippedBraces ) );
 637                                 }
 638
 639                                 extract( $stack->getFlags() );
 640
 641                                 # Add XML element to the enclosing accumulator
 642                                 if ( $element instanceof PPNode ) {
 643                                         $accum->addNode( $element );
 644                                 } else {
 645                                         $accum->addAccum( $element );
 646                                 }
 647                         }
 648
 649                         elseif ( $found == 'pipe' ) {
 650                                 $findEquals = true; // shortcut for getFlags()
 651                                 $stack->addPart();
 652                                 $accum =& $stack->getAccum();
 653                                 ++$i;
 654                         }
 655
 656                         elseif ( $found == 'equals' ) {
 657                                 $findEquals = false; // shortcut for getFlags()
 658                                 $accum->addNodeWithText( 'equals', '=' );
 659                                 $stack->getCurrentPart()->eqpos = $accum->lastNode;
 660                                 ++$i;
 661                         }
 662                 }
 663
 664                 # Output any remaining unclosed brackets
 665                 foreach ( $stack->stack as $piece ) {
 666                         $stack->rootAccum->addAccum( $piece->breakSyntax() );
 667                 }
 668
 669                 # Enable top-level headings
 670                 for ( $node = $stack->rootAccum->firstNode; $node; $node = $node->nextSibling ) {
 671                         if ( isset( $node->name ) && $node->name === 'possible-h' ) {
 672                                 $node->name = 'h';
 673                         }
 674                 }
 675
 676                 $rootNode = new PPNode_Hash_Tree( 'root' );
 677                 $rootNode->firstChild = $stack->rootAccum->firstNode;
 678                 $rootNode->lastChild = $stack->rootAccum->lastNode;
 679
 680                 // Cache
 681                 if ($cacheable) {
 682                         $cacheValue = sprintf( "%08d", self::CACHE_VERSION ) . serialize( $rootNode );
 683                         $wgMemc->set( $cacheKey, $cacheValue, 86400 );
 684                         wfProfileOut( __METHOD__.'-cache-miss' );
 685                         wfProfileOut( __METHOD__.'-cacheable' );
 686                         wfDebugLog( "Preprocessor", "Saved preprocessor Hash to memcached (key $cacheKey)" );
 687                 }
 688
 689                 wfProfileOut( __METHOD__ );
 690                 return $rootNode;
 691         }
 692 }
 693
 694 /**
 695  * Stack class to help Preprocessor::preprocessToObj()
 696  * @ingroup Parser
 697  */
 698 class PPDStack_Hash extends PPDStack {
 699         function __construct() {
 700                 $this->elementClass = 'PPDStackElement_Hash';
 701                 parent::__construct();
 702                 $this->rootAccum = new PPDAccum_Hash;
 703         }
 704 }
 705
 706 /**
 707  * @ingroup Parser
 708  */
 709 class PPDStackElement_Hash extends PPDStackElement {
 710         function __construct( $data = array() ) {
 711                 $this->partClass = 'PPDPart_Hash';
 712                 parent::__construct( $data );
 713         }
 714
 715         /**
 716          * Get the accumulator that would result if the close is not found.
 717          */
 718         function breakSyntax( $openingCount = false ) {
 719                 if ( $this->open == "\n" ) {
 720                         $accum = $this->parts[0]->out;
 721                 } else {
 722                         if ( $openingCount === false ) {
 723                                 $openingCount = $this->count;
 724                         }
 725                         $accum = new PPDAccum_Hash;
 726                         $accum->addLiteral( str_repeat( $this->open, $openingCount ) );
 727                         $first = true;
 728                         foreach ( $this->parts as $part ) {
 729                                 if ( $first ) {
 730                                         $first = false;
 731                                 } else {
 732                                         $accum->addLiteral( '|' );
 733                                 }
 734                                 $accum->addAccum( $part->out );
 735                         }
 736                 }
 737                 return $accum;
 738         }
 739 }
 740
 741 /**
 742  * @ingroup Parser
 743  */
 744 class PPDPart_Hash extends PPDPart {
 745         function __construct( $out = '' ) {
 746                 $accum = new PPDAccum_Hash;
 747                 if ( $out !== '' ) {
 748                         $accum->addLiteral( $out );
 749                 }
 750                 parent::__construct( $accum );
 751         }
 752 }
 753
 754 /**
 755  * @ingroup Parser
 756  */
 757 class PPDAccum_Hash {
 758         var $firstNode, $lastNode;
 759
 760         function __construct() {
 761                 $this->firstNode = $this->lastNode = false;
 762         }
 763
 764         /**
 765          * Append a string literal
 766          */
 767         function addLiteral( $s ) {
 768                 if ( $this->lastNode === false ) {
 769                         $this->firstNode = $this->lastNode = new PPNode_Hash_Text( $s );
 770                 } elseif ( $this->lastNode instanceof PPNode_Hash_Text ) {
 771                         $this->lastNode->value .= $s;
 772                 } else {
 773                         $this->lastNode->nextSibling = new PPNode_Hash_Text( $s );
 774                         $this->lastNode = $this->lastNode->nextSibling;
 775                 }
 776         }
 777
 778         /**
 779          * Append a PPNode
 780          */
 781         function addNode( PPNode $node ) {
 782                 if ( $this->lastNode === false ) {
 783                         $this->firstNode = $this->lastNode = $node;
 784                 } else {
 785                         $this->lastNode->nextSibling = $node;
 786                         $this->lastNode = $node;
 787                 }
 788         }
 789
 790         /**
 791          * Append a tree node with text contents
 792          */
 793         function addNodeWithText( $name, $value ) {
 794                 $node = PPNode_Hash_Tree::newWithText( $name, $value );
 795                 $this->addNode( $node );
 796         }
 797
 798         /**
 799          * Append a PPAccum_Hash
 800          * Takes over ownership of the nodes in the source argument. These nodes may
 801          * subsequently be modified, especially nextSibling.
 802          */
 803         function addAccum( $accum ) {
 804                 if ( $accum->lastNode === false ) {
 805                         // nothing to add
 806                 } elseif ( $this->lastNode === false ) {
 807                         $this->firstNode = $accum->firstNode;
 808                         $this->lastNode = $accum->lastNode;
 809                 } else {
 810                         $this->lastNode->nextSibling = $accum->firstNode;
 811                         $this->lastNode = $accum->lastNode;
 812                 }
 813         }
 814 }
 815
 816 /**
 817  * An expansion frame, used as a context to expand the result of preprocessToObj()
 818  * @ingroup Parser
 819  */
 820 class PPFrame_Hash implements PPFrame {
 821         var $preprocessor, $parser, $title;
 822         var $titleCache;
 823
 824         /**
 825          * Hashtable listing templates which are disallowed for expansion in this frame,
 826          * having been encountered previously in parent frames.
 827          */
 828         var $loopCheckHash;
 829
 830         /**
 831          * Recursion depth of this frame, top = 0
 832          * Note that this is NOT the same as expansion depth in expand()
 833          */
 834         var $depth;
 835
 836
 837         /**
 838          * Construct a new preprocessor frame.
 839          * @param $preprocessor Preprocessor: the parent preprocessor
 840          */
 841         function __construct( $preprocessor ) {
 842                 $this->preprocessor = $preprocessor;
 843                 $this->parser = $preprocessor->parser;
 844                 $this->title = $this->parser->mTitle;
 845                 $this->titleCache = array( $this->title ? $this->title->getPrefixedDBkey() : false );
 846                 $this->loopCheckHash = array();
 847                 $this->depth = 0;
 848         }
 849
 850         /**
 851          * Create a new child frame
 852          * $args is optionally a multi-root PPNode or array containing the template arguments
 853          */
 854         function newChild( $args = false, $title = false ) {
 855                 $namedArgs = array();
 856                 $numberedArgs = array();
 857                 if ( $title === false ) {
 858                         $title = $this->title;
 859                 }
 860                 if ( $args !== false ) {
 861                         if ( $args instanceof PPNode_Hash_Array ) {
 862                                 $args = $args->value;
 863                         } elseif ( !is_array( $args ) ) {
 864                                 throw new MWException( __METHOD__ . ': $args must be array or PPNode_Hash_Array' );
 865                         }
 866                         foreach ( $args as $arg ) {
 867                                 $bits = $arg->splitArg();
 868                                 if ( $bits['index'] !== '' ) {
 869                                         // Numbered parameter
 870                                         $numberedArgs[$bits['index']] = $bits['value'];
 871                                         unset( $namedArgs[$bits['index']] );
 872                                 } else {
 873                                         // Named parameter
 874                                         $name = trim( $this->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
 875                                         $namedArgs[$name] = $bits['value'];
 876                                         unset( $numberedArgs[$name] );
 877                                 }
 878                         }
 879                 }
 880                 return new PPTemplateFrame_Hash( $this->preprocessor, $this, $numberedArgs, $namedArgs, $title );
 881         }
 882
 883         function expand( $root, $flags = 0 ) {
 884                 static $expansionDepth = 0;
 885                 if ( is_string( $root ) ) {
 886                         return $root;
 887                 }
 888
 889                 if ( ++$this->parser->mPPNodeCount > $this->parser->mOptions->getMaxPPNodeCount() )
 890                 {
 891                         return '<span class="error">Node-count limit exceeded</span>';
 892                 }
 893                 if ( $expansionDepth > $this->parser->mOptions->getMaxPPExpandDepth() ) {
 894                         return '<span class="error">Expansion depth limit exceeded</span>';
 895                 }
 896                 ++$expansionDepth;
 897
 898                 $outStack = array( '', '' );
 899                 $iteratorStack = array( false, $root );
 900                 $indexStack = array( 0, 0 );
 901
 902                 while ( count( $iteratorStack ) > 1 ) {
 903                         $level = count( $outStack ) - 1;
 904                         $iteratorNode =& $iteratorStack[ $level ];
 905                         $out =& $outStack[$level];
 906                         $index =& $indexStack[$level];
 907
 908                         if ( is_array( $iteratorNode ) ) {
 909                                 if ( $index >= count( $iteratorNode ) ) {
 910                                         // All done with this iterator
 911                                         $iteratorStack[$level] = false;
 912                                         $contextNode = false;
 913                                 } else {
 914                                         $contextNode = $iteratorNode[$index];
 915                                         $index++;
 916                                 }
 917                         } elseif ( $iteratorNode instanceof PPNode_Hash_Array ) {
 918                                 if ( $index >= $iteratorNode->getLength() ) {
 919                                         // All done with this iterator
 920                                         $iteratorStack[$level] = false;
 921                                         $contextNode = false;
 922                                 } else {
 923                                         $contextNode = $iteratorNode->item( $index );
 924                                         $index++;
 925                                 }
 926                         } else {
 927                                 // Copy to $contextNode and then delete from iterator stack,
 928                                 // because this is not an iterator but we do have to execute it once
 929                                 $contextNode = $iteratorStack[$level];
 930                                 $iteratorStack[$level] = false;
 931                         }
 932
 933                         $newIterator = false;
 934
 935                         if ( $contextNode === false ) {
 936                                 // nothing to do
 937                         } elseif ( is_string( $contextNode ) ) {
 938                                 $out .= $contextNode;
 939                         } elseif ( is_array( $contextNode ) || $contextNode instanceof PPNode_Hash_Array ) {
 940                                 $newIterator = $contextNode;
 941                         } elseif ( $contextNode instanceof PPNode_Hash_Attr ) {
 942                                 // No output
 943                         } elseif ( $contextNode instanceof PPNode_Hash_Text ) {
 944                                 $out .= $contextNode->value;
 945                         } elseif ( $contextNode instanceof PPNode_Hash_Tree ) {
 946                                 if ( $contextNode->name == 'template' ) {
 947                                         # Double-brace expansion
 948                                         $bits = $contextNode->splitTemplate();
 949                                         if ( $flags & PPFrame::NO_TEMPLATES ) {
 950                                                 $newIterator = $this->virtualBracketedImplode( '{{', '|', '}}', $bits['title'], $bits['parts'] );
 951                                         } else {
 952                                                 $ret = $this->parser->braceSubstitution( $bits, $this );
 953                                                 if ( isset( $ret['object'] ) ) {
 954                                                         $newIterator = $ret['object'];
 955                                                 } else {
 956                                                         $out .= $ret['text'];
 957                                                 }
 958                                         }
 959                                 } elseif ( $contextNode->name == 'tplarg' ) {
 960                                         # Triple-brace expansion
 961                                         $bits = $contextNode->splitTemplate();
 962                                         if ( $flags & PPFrame::NO_ARGS ) {
 963                                                 $newIterator = $this->virtualBracketedImplode( '{{{', '|', '}}}', $bits['title'], $bits['parts'] );
 964                                         } else {
 965                                                 $ret = $this->parser->argSubstitution( $bits, $this );
 966                                                 if ( isset( $ret['object'] ) ) {
 967                                                         $newIterator = $ret['object'];
 968                                                 } else {
 969                                                         $out .= $ret['text'];
 970                                                 }
 971                                         }
 972                                 } elseif ( $contextNode->name == 'comment' ) {
 973                                         # HTML-style comment
 974                                         # Remove it in HTML, pre+remove and STRIP_COMMENTS modes
 975                                         if ( $this->parser->ot['html']
 976                                                 || ( $this->parser->ot['pre'] && $this->parser->mOptions->getRemoveComments() )
 977                                                 || ( $flags & PPFrame::STRIP_COMMENTS ) )
 978                                         {
 979                                                 $out .= '';
 980                                         }
 981                                         # Add a strip marker in PST mode so that pstPass2() can run some old-fashioned regexes on the result
 982                                         # Not in RECOVER_COMMENTS mode (extractSections) though
 983                                         elseif ( $this->parser->ot['wiki'] && ! ( $flags & PPFrame::RECOVER_COMMENTS ) ) {
 984                                                 $out .= $this->parser->insertStripItem( $contextNode->firstChild->value );
 985                                         }
 986                                         # Recover the literal comment in RECOVER_COMMENTS and pre+no-remove
 987                                         else {
 988                                                 $out .= $contextNode->firstChild->value;
 989                                         }
 990                                 } elseif ( $contextNode->name == 'ignore' ) {
 991                                         # Output suppression used by <includeonly> etc.
 992                                         # OT_WIKI will only respect <ignore> in substed templates.
 993                                         # The other output types respect it unless NO_IGNORE is set.
 994                                         # extractSections() sets NO_IGNORE and so never respects it.
 995                                         if ( ( !isset( $this->parent ) && $this->parser->ot['wiki'] ) || ( $flags & PPFrame::NO_IGNORE ) ) {
 996                                                 $out .= $contextNode->firstChild->value;
 997                                         } else {
 998                                                 //$out .= '';
 999                                         }
1000                                 } elseif ( $contextNode->name == 'ext' ) {
1001                                         # Extension tag
1002                                         $bits = $contextNode->splitExt() + array( 'attr' => null, 'inner' => null, 'close' => null );
1003                                         $out .= $this->parser->extensionSubstitution( $bits, $this );
1004                                 } elseif ( $contextNode->name == 'h' ) {
1005                                         # Heading
1006                                         if ( $this->parser->ot['html'] ) {
1007                                                 # Expand immediately and insert heading index marker
1008                                                 $s = '';
1009                                                 for ( $node = $contextNode->firstChild; $node; $node = $node->nextSibling ) {
1010                                                         $s .= $this->expand( $node, $flags );
1011                                                 }
1012
1013                                                 $bits = $contextNode->splitHeading();
1014                                                 $titleText = $this->title->getPrefixedDBkey();
1015                                                 $this->parser->mHeadings[] = array( $titleText, $bits['i'] );
1016                                                 $serial = count( $this->parser->mHeadings ) - 1;
1017                                                 $marker = "{$this->parser->mUniqPrefix}-h-$serial-" . Parser::MARKER_SUFFIX;
1018                                                 $s = substr( $s, 0, $bits['level'] ) . $marker . substr( $s, $bits['level'] );
1019                                                 $this->parser->mStripState->general->setPair( $marker, '' );
1020                                                 $out .= $s;
1021                                         } else {
1022                                                 # Expand in virtual stack
1023                                                 $newIterator = $contextNode->getChildren();
1024                                         }
1025                                 } else {
1026                                         # Generic recursive expansion
1027                                         $newIterator = $contextNode->getChildren();
1028                                 }
1029                         } else {
1030                                 throw new MWException( __METHOD__.': Invalid parameter type' );
1031                         }
1032
1033                         if ( $newIterator !== false ) {
1034                                 $outStack[] = '';
1035                                 $iteratorStack[] = $newIterator;
1036                                 $indexStack[] = 0;
1037                         } elseif ( $iteratorStack[$level] === false ) {
1038                                 // Return accumulated value to parent
1039                                 // With tail recursion
1040                                 while ( $iteratorStack[$level] === false && $level > 0 ) {
1041                                         $outStack[$level - 1] .= $out;
1042                                         array_pop( $outStack );
1043                                         array_pop( $iteratorStack );
1044                                         array_pop( $indexStack );
1045                                         $level--;
1046                                 }
1047                         }
1048                 }
1049                 --$expansionDepth;
1050                 return $outStack[0];
1051         }
1052
1053         function implodeWithFlags( $sep, $flags /*, ... */ ) {
1054                 $args = array_slice( func_get_args(), 2 );
1055
1056                 $first = true;
1057                 $s = '';
1058                 foreach ( $args as $root ) {
1059                         if ( $root instanceof PPNode_Hash_Array ) {
1060                                 $root = $root->value;
1061                         }
1062                         if ( !is_array( $root ) ) {
1063                                 $root = array( $root );
1064                         }
1065                         foreach ( $root as $node ) {
1066                                 if ( $first ) {
1067                                         $first = false;
1068                                 } else {
1069                                         $s .= $sep;
1070                                 }
1071                                 $s .= $this->expand( $node, $flags );
1072                         }
1073                 }
1074                 return $s;
1075         }
1076
1077         /**
1078          * Implode with no flags specified
1079          * This previously called implodeWithFlags but has now been inlined to reduce stack depth
1080          */
1081         function implode( $sep /*, ... */ ) {
1082                 $args = array_slice( func_get_args(), 1 );
1083
1084                 $first = true;
1085                 $s = '';
1086                 foreach ( $args as $root ) {
1087                         if ( $root instanceof PPNode_Hash_Array ) {
1088                                 $root = $root->value;
1089                         }
1090                         if ( !is_array( $root ) ) {
1091                                 $root = array( $root );
1092                         }
1093                         foreach ( $root as $node ) {
1094                                 if ( $first ) {
1095                                         $first = false;
1096                                 } else {
1097                                         $s .= $sep;
1098                                 }
1099                                 $s .= $this->expand( $node );
1100                         }
1101                 }
1102                 return $s;
1103         }
1104
1105         /**
1106          * Makes an object that, when expand()ed, will be the same as one obtained
1107          * with implode()
1108          */
1109         function virtualImplode( $sep /*, ... */ ) {
1110                 $args = array_slice( func_get_args(), 1 );
1111                 $out = array();
1112                 $first = true;
1113
1114                 foreach ( $args as $root ) {
1115                         if ( $root instanceof PPNode_Hash_Array ) {
1116                                 $root = $root->value;
1117                         }
1118                         if ( !is_array( $root ) ) {
1119                                 $root = array( $root );
1120                         }
1121                         foreach ( $root as $node ) {
1122                                 if ( $first ) {
1123                                         $first = false;
1124                                 } else {
1125                                         $out[] = $sep;
1126                                 }
1127                                 $out[] = $node;
1128                         }
1129                 }
1130                 return new PPNode_Hash_Array( $out );
1131         }
1132
1133         /**
1134          * Virtual implode with brackets
1135          */
1136         function virtualBracketedImplode( $start, $sep, $end /*, ... */ ) {
1137                 $args = array_slice( func_get_args(), 3 );
1138                 $out = array( $start );
1139                 $first = true;
1140
1141                 foreach ( $args as $root ) {
1142                         if ( $root instanceof PPNode_Hash_Array ) {
1143                                 $root = $root->value;
1144                         }
1145                         if ( !is_array( $root ) ) {
1146                                 $root = array( $root );
1147                         }
1148                         foreach ( $root as $node ) {
1149                                 if ( $first ) {
1150                                         $first = false;
1151                                 } else {
1152                                         $out[] = $sep;
1153                                 }
1154                                 $out[] = $node;
1155                         }
1156                 }
1157                 $out[] = $end;
1158                 return new PPNode_Hash_Array( $out );
1159         }
1160
1161         function __toString() {
1162                 return 'frame{}';
1163         }
1164
1165         function getPDBK( $level = false ) {
1166                 if ( $level === false ) {
1167                         return $this->title->getPrefixedDBkey();
1168                 } else {
1169                         return isset( $this->titleCache[$level] ) ? $this->titleCache[$level] : false;
1170                 }
1171         }
1172
1173         function getArguments() {
1174                 return array();
1175         }
1176
1177         function getNumberedArguments() {
1178                 return array();
1179         }
1180
1181         function getNamedArguments() {
1182                 return array();
1183         }
1184
1185         /**
1186          * Returns true if there are no arguments in this frame
1187          */
1188         function isEmpty() {
1189                 return true;
1190         }
1191
1192         function getArgument( $name ) {
1193                 return false;
1194         }
1195
1196         /**
1197          * Returns true if the infinite loop check is OK, false if a loop is detected
1198          */
1199         function loopCheck( $title ) {
1200                 return !isset( $this->loopCheckHash[$title->getPrefixedDBkey()] );
1201         }
1202
1203         /**
1204          * Return true if the frame is a template frame
1205          */
1206         function isTemplate() {
1207                 return false;
1208         }
1209 }
1210
1211 /**
1212  * Expansion frame with template arguments
1213  * @ingroup Parser
1214  */
1215 class PPTemplateFrame_Hash extends PPFrame_Hash {
1216         var $numberedArgs, $namedArgs, $parent;
1217         var $numberedExpansionCache, $namedExpansionCache;
1218
1219         function __construct( $preprocessor, $parent = false, $numberedArgs = array(), $namedArgs = array(), $title = false ) {
1220                 parent::__construct( $preprocessor );
1221
1222                 $this->parent = $parent;
1223                 $this->numberedArgs = $numberedArgs;
1224                 $this->namedArgs = $namedArgs;
1225                 $this->title = $title;
1226                 $pdbk = $title ? $title->getPrefixedDBkey() : false;
1227                 $this->titleCache = $parent->titleCache;
1228                 $this->titleCache[] = $pdbk;
1229                 $this->loopCheckHash = /*clone*/ $parent->loopCheckHash;
1230                 if ( $pdbk !== false ) {
1231                         $this->loopCheckHash[$pdbk] = true;
1232                 }
1233                 $this->depth = $parent->depth + 1;
1234                 $this->numberedExpansionCache = $this->namedExpansionCache = array();
1235         }
1236
1237         function __toString() {
1238                 $s = 'tplframe{';
1239                 $first = true;
1240                 $args = $this->numberedArgs + $this->namedArgs;
1241                 foreach ( $args as $name => $value ) {
1242                         if ( $first ) {
1243                                 $first = false;
1244                         } else {
1245                                 $s .= ', ';
1246                         }
1247                         $s .= "\"$name\":\"" .
1248                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1249                 }
1250                 $s .= '}';
1251                 return $s;
1252         }
1253         /**
1254          * Returns true if there are no arguments in this frame
1255          */
1256         function isEmpty() {
1257                 return !count( $this->numberedArgs ) && !count( $this->namedArgs );
1258         }
1259
1260         function getArguments() {
1261                 $arguments = array();
1262                 foreach ( array_merge(
1263                                 array_keys($this->numberedArgs),
1264                                 array_keys($this->namedArgs)) as $key ) {
1265                         $arguments[$key] = $this->getArgument($key);
1266                 }
1267                 return $arguments;
1268         }
1269
1270         function getNumberedArguments() {
1271                 $arguments = array();
1272                 foreach ( array_keys($this->numberedArgs) as $key ) {
1273                         $arguments[$key] = $this->getArgument($key);
1274                 }
1275                 return $arguments;
1276         }
1277
1278         function getNamedArguments() {
1279                 $arguments = array();
1280                 foreach ( array_keys($this->namedArgs) as $key ) {
1281                         $arguments[$key] = $this->getArgument($key);
1282                 }
1283                 return $arguments;
1284         }
1285
1286         function getNumberedArgument( $index ) {
1287                 if ( !isset( $this->numberedArgs[$index] ) ) {
1288                         return false;
1289                 }
1290                 if ( !isset( $this->numberedExpansionCache[$index] ) ) {
1291                         # No trimming for unnamed arguments
1292                         $this->numberedExpansionCache[$index] = $this->parent->expand( $this->numberedArgs[$index], PPFrame::STRIP_COMMENTS );
1293                 }
1294                 return $this->numberedExpansionCache[$index];
1295         }
1296
1297         function getNamedArgument( $name ) {
1298                 if ( !isset( $this->namedArgs[$name] ) ) {
1299                         return false;
1300                 }
1301                 if ( !isset( $this->namedExpansionCache[$name] ) ) {
1302                         # Trim named arguments post-expand, for backwards compatibility
1303                         $this->namedExpansionCache[$name] = trim(
1304                                 $this->parent->expand( $this->namedArgs[$name], PPFrame::STRIP_COMMENTS ) );
1305                 }
1306                 return $this->namedExpansionCache[$name];
1307         }
1308
1309         function getArgument( $name ) {
1310                 $text = $this->getNumberedArgument( $name );
1311                 if ( $text === false ) {
1312                         $text = $this->getNamedArgument( $name );
1313                 }
1314                 return $text;
1315         }
1316
1317         /**
1318          * Return true if the frame is a template frame
1319          */
1320         function isTemplate() {
1321                 return true;
1322         }
1323 }
1324
1325 /**
1326  * Expansion frame with custom arguments
1327  * @ingroup Parser
1328  */
1329 class PPCustomFrame_Hash extends PPFrame_Hash {
1330         var $args;
1331
1332         function __construct( $preprocessor, $args ) {
1333                 parent::__construct( $preprocessor );
1334                 $this->args = $args;
1335         }
1336
1337         function __toString() {
1338                 $s = 'cstmframe{';
1339                 $first = true;
1340                 foreach ( $this->args as $name => $value ) {
1341                         if ( $first ) {
1342                                 $first = false;
1343                         } else {
1344                                 $s .= ', ';
1345                         }
1346                         $s .= "\"$name\":\"" .
1347                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1348                 }
1349                 $s .= '}';
1350                 return $s;
1351         }
1352
1353         function isEmpty() {
1354                 return !count( $this->args );
1355         }
1356
1357         function getArgument( $index ) {
1358                 if ( !isset( $this->args[$index] ) ) {
1359                         return false;
1360                 }
1361                 return $this->args[$index];
1362         }
1363 }
1364
1365 /**
1366  * @ingroup Parser
1367  */
1368 class PPNode_Hash_Tree implements PPNode {
1369         var $name, $firstChild, $lastChild, $nextSibling;
1370
1371         function __construct( $name ) {
1372                 $this->name = $name;
1373                 $this->firstChild = $this->lastChild = $this->nextSibling = false;
1374         }
1375
1376         function __toString() {
1377                 $inner = '';
1378                 $attribs = '';
1379                 for ( $node = $this->firstChild; $node; $node = $node->nextSibling ) {
1380                         if ( $node instanceof PPNode_Hash_Attr ) {
1381                                 $attribs .= ' ' . $node->name . '="' . htmlspecialchars( $node->value ) . '"';
1382                         } else {
1383                                 $inner .= $node->__toString();
1384                         }
1385                 }
1386                 if ( $inner === '' ) {
1387                         return "<{$this->name}$attribs/>";
1388                 } else {
1389                         return "<{$this->name}$attribs>$inner</{$this->name}>";
1390                 }
1391         }
1392
1393         static function newWithText( $name, $text ) {
1394                 $obj = new self( $name );
1395                 $obj->addChild( new PPNode_Hash_Text( $text ) );
1396                 return $obj;
1397         }
1398
1399         function addChild( $node ) {
1400                 if ( $this->lastChild === false ) {
1401                         $this->firstChild = $this->lastChild = $node;
1402                 } else {
1403                         $this->lastChild->nextSibling = $node;
1404                         $this->lastChild = $node;
1405                 }
1406         }
1407
1408         function getChildren() {
1409                 $children = array();
1410                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1411                         $children[] = $child;
1412                 }
1413                 return new PPNode_Hash_Array( $children );
1414         }
1415
1416         function getFirstChild() {
1417                 return $this->firstChild;
1418         }
1419
1420         function getNextSibling() {
1421                 return $this->nextSibling;
1422         }
1423
1424         function getChildrenOfType( $name ) {
1425                 $children = array();
1426                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1427                         if ( isset( $child->name ) && $child->name === $name ) {
1428                                 $children[] = $name;
1429                         }
1430                 }
1431                 return $children;
1432         }
1433
1434         function getLength() { return false; }
1435         function item( $i ) { return false; }
1436
1437         function getName() {
1438                 return $this->name;
1439         }
1440
1441         /**
1442          * Split a <part> node into an associative array containing:
1443          *    name          PPNode name
1444          *    index         String index
1445          *    value         PPNode value
1446          */
1447         function splitArg() {
1448                 $bits = array();
1449                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1450                         if ( !isset( $child->name ) ) {
1451                                 continue;
1452                         }
1453                         if ( $child->name === 'name' ) {
1454                                 $bits['name'] = $child;
1455                                 if ( $child->firstChild instanceof PPNode_Hash_Attr
1456                                         && $child->firstChild->name === 'index' )
1457                                 {
1458                                         $bits['index'] = $child->firstChild->value;
1459                                 }
1460                         } elseif ( $child->name === 'value' ) {
1461                                 $bits['value'] = $child;
1462                         }
1463                 }
1464
1465                 if ( !isset( $bits['name'] ) ) {
1466                         throw new MWException( 'Invalid brace node passed to ' . __METHOD__ );
1467                 }
1468                 if ( !isset( $bits['index'] ) ) {
1469                         $bits['index'] = '';
1470                 }
1471                 return $bits;
1472         }
1473
1474         /**
1475          * Split an <ext> node into an associative array containing name, attr, inner and close
1476          * All values in the resulting array are PPNodes. Inner and close are optional.
1477          */
1478         function splitExt() {
1479                 $bits = array();
1480                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1481                         if ( !isset( $child->name ) ) {
1482                                 continue;
1483                         }
1484                         if ( $child->name == 'name' ) {
1485                                 $bits['name'] = $child;
1486                         } elseif ( $child->name == 'attr' ) {
1487                                 $bits['attr'] = $child;
1488                         } elseif ( $child->name == 'inner' ) {
1489                                 $bits['inner'] = $child;
1490                         } elseif ( $child->name == 'close' ) {
1491                                 $bits['close'] = $child;
1492                         }
1493                 }
1494                 if ( !isset( $bits['name'] ) ) {
1495                         throw new MWException( 'Invalid ext node passed to ' . __METHOD__ );
1496                 }
1497                 return $bits;
1498         }
1499
1500         /**
1501          * Split an <h> node
1502          */
1503         function splitHeading() {
1504                 if ( $this->name !== 'h' ) {
1505                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1506                 }
1507                 $bits = array();
1508                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1509                         if ( !isset( $child->name ) ) {
1510                                 continue;
1511                         }
1512                         if ( $child->name == 'i' ) {
1513                                 $bits['i'] = $child->value;
1514                         } elseif ( $child->name == 'level' ) {
1515                                 $bits['level'] = $child->value;
1516                         }
1517                 }
1518                 if ( !isset( $bits['i'] ) ) {
1519                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1520                 }
1521                 return $bits;
1522         }
1523
1524         /**
1525          * Split a <template> or <tplarg> node
1526          */
1527         function splitTemplate() {
1528                 $parts = array();
1529                 $bits = array( 'lineStart' => '' );
1530                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1531                         if ( !isset( $child->name ) ) {
1532                                 continue;
1533                         }
1534                         if ( $child->name == 'title' ) {
1535                                 $bits['title'] = $child;
1536                         }
1537                         if ( $child->name == 'part' ) {
1538                                 $parts[] = $child;
1539                         }
1540                         if ( $child->name == 'lineStart' ) {
1541                                 $bits['lineStart'] = '1';
1542                         }
1543                 }
1544                 if ( !isset( $bits['title'] ) ) {
1545                         throw new MWException( 'Invalid node passed to ' . __METHOD__ );
1546                 }
1547                 $bits['parts'] = new PPNode_Hash_Array( $parts );
1548                 return $bits;
1549         }
1550 }
1551
1552 /**
1553  * @ingroup Parser
1554  */
1555 class PPNode_Hash_Text implements PPNode {
1556         var $value, $nextSibling;
1557
1558         function __construct( $value ) {
1559                 if ( is_object( $value ) ) {
1560                         throw new MWException( __CLASS__ . ' given object instead of string' );
1561                 }
1562                 $this->value = $value;
1563         }
1564
1565         function __toString() {
1566                 return htmlspecialchars( $this->value );
1567         }
1568
1569         function getNextSibling() {
1570                 return $this->nextSibling;
1571         }
1572
1573         function getChildren() { return false; }
1574         function getFirstChild() { return false; }
1575         function getChildrenOfType( $name ) { return false; }
1576         function getLength() { return false; }
1577         function item( $i ) { return false; }
1578         function getName() { return '#text'; }
1579         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1580         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1581         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1582 }
1583
1584 /**
1585  * @ingroup Parser
1586  */
1587 class PPNode_Hash_Array implements PPNode {
1588         var $value, $nextSibling;
1589
1590         function __construct( $value ) {
1591                 $this->value = $value;
1592         }
1593
1594         function __toString() {
1595                 return var_export( $this, true );
1596         }
1597
1598         function getLength() {
1599                 return count( $this->value );
1600         }
1601
1602         function item( $i ) {
1603                 return $this->value[$i];
1604         }
1605
1606         function getName() { return '#nodelist'; }
1607
1608         function getNextSibling() {
1609                 return $this->nextSibling;
1610         }
1611
1612         function getChildren() { return false; }
1613         function getFirstChild() { return false; }
1614         function getChildrenOfType( $name ) { return false; }
1615         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1616         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1617         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1618 }
1619
1620 /**
1621  * @ingroup Parser
1622  */
1623 class PPNode_Hash_Attr implements PPNode {
1624         var $name, $value, $nextSibling;
1625
1626         function __construct( $name, $value ) {
1627                 $this->name = $name;
1628                 $this->value = $value;
1629         }
1630
1631         function __toString() {
1632                 return "<@{$this->name}>" . htmlspecialchars( $this->value ) . "</@{$this->name}>";
1633         }
1634
1635         function getName() {
1636                 return $this->name;
1637         }
1638
1639         function getNextSibling() {
1640                 return $this->nextSibling;
1641         }
1642
1643         function getChildren() { return false; }
1644         function getFirstChild() { return false; }
1645         function getChildrenOfType( $name ) { return false; }
1646         function getLength() { return false; }
1647         function item( $i ) { return false; }
1648         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1649         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1650         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1651 }