includes/parser/Preprocessor_HipHop.hphp

   1 <?php
   2 /**
   3  * A preprocessor optimised for HipHop, using HipHop-specific syntax.
   4  * vim: ft=php
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup Parser
  23  */
  24
  25 /**
  26  * @ingroup Parser
  27  */
  28 class Preprocessor_HipHop implements Preprocessor {
  29         /**
  30          * @var Parser
  31          */
  32         var $parser;
  33
  34         const CACHE_VERSION = 1;
  35
  36         /**
  37          * @param $parser Parser
  38          */
  39         function __construct( $parser ) {
  40                 $this->parser = $parser;
  41         }
  42
  43         /**
  44          * @return PPFrame_HipHop
  45          */
  46         function newFrame() {
  47                 return new PPFrame_HipHop( $this );
  48         }
  49
  50         /**
  51          * @param $args array
  52          * @return PPCustomFrame_HipHop
  53          */
  54         function newCustomFrame( array $args ) {
  55                 return new PPCustomFrame_HipHop( $this, $args );
  56         }
  57
  58         /**
  59          * @param $values array
  60          * @return PPNode_HipHop_Array
  61          */
  62         function newPartNodeArray( $values ) {
  63                 $list = array();
  64
  65                 foreach ( $values as $k => $val ) {
  66                         $partNode = new PPNode_HipHop_Tree( 'part' );
  67                         $nameNode = new PPNode_HipHop_Tree( 'name' );
  68
  69                         if ( is_int( $k ) ) {
  70                                 $nameNode->addChild( new PPNode_HipHop_Attr( 'index', $k ) );
  71                                 $partNode->addChild( $nameNode );
  72                         } else {
  73                                 $nameNode->addChild( new PPNode_HipHop_Text( $k ) );
  74                                 $partNode->addChild( $nameNode );
  75                                 $partNode->addChild( new PPNode_HipHop_Text( '=' ) );
  76                         }
  77
  78                         $valueNode = new PPNode_HipHop_Tree( 'value' );
  79                         $valueNode->addChild( new PPNode_HipHop_Text( $val ) );
  80                         $partNode->addChild( $valueNode );
  81
  82                         $list[] = $partNode;
  83                 }
  84
  85                 $node = new PPNode_HipHop_Array( $list );
  86                 return $node;
  87         }
  88
  89         /**
  90          * Preprocess some wikitext and return the document tree.
  91          * This is the ghost of Parser::replace_variables().
  92          *
  93          * @param $text String: the text to parse
  94          * @param $flags Integer: bitwise combination of:
  95          *          Parser::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
  96          *                                     included. Default is to assume a direct page view.
  97          *
  98          * The generated DOM tree must depend only on the input text and the flags.
  99          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
 100          *
 101          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
 102          * change in the DOM tree for a given text, must be passed through the section identifier
 103          * in the section edit link and thus back to extractSections().
 104          *
 105          * The output of this function is currently only cached in process memory, but a persistent
 106          * cache may be implemented at a later date which takes further advantage of these strict
 107          * dependency requirements.
 108          *
 109          * @throws MWException
 110          * @return PPNode_HipHop_Tree
 111          */
 112         function preprocessToObj( string $text, int $flags = 0 ) {
 113                 wfProfileIn( __METHOD__ );
 114
 115                 // Check cache.
 116                 global $wgMemc, $wgPreprocessorCacheThreshold;
 117
 118                 $lengthText = strlen( $text );
 119
 120                 $cacheable = ($wgPreprocessorCacheThreshold !== false && $lengthText > $wgPreprocessorCacheThreshold);
 121                 if ( $cacheable ) {
 122                         wfProfileIn( __METHOD__.'-cacheable' );
 123
 124                         $cacheKey = strval( wfMemcKey( 'preprocess-hash', md5($text), $flags ) );
 125                         $cacheValue = strval( $wgMemc->get( $cacheKey ) );
 126                         if ( $cacheValue !== '' ) {
 127                                 $version = substr( $cacheValue, 0, 8 );
 128                                 if ( intval( $version ) == self::CACHE_VERSION ) {
 129                                         $hash = unserialize( substr( $cacheValue, 8 ) );
 130                                         // From the cache
 131                                         wfDebugLog( "Preprocessor",
 132                                                 "Loaded preprocessor hash from memcached (key $cacheKey)" );
 133                                         wfProfileOut( __METHOD__.'-cacheable' );
 134                                         wfProfileOut( __METHOD__ );
 135                                         return $hash;
 136                                 }
 137                         }
 138                         wfProfileIn( __METHOD__.'-cache-miss' );
 139                 }
 140
 141                 $rules = array(
 142                         '{' => array(
 143                                 'end' => '}',
 144                                 'names' => array(
 145                                         2 => 'template',
 146                                         3 => 'tplarg',
 147                                 ),
 148                                 'min' => 2,
 149                                 'max' => 3,
 150                         ),
 151                         '[' => array(
 152                                 'end' => ']',
 153                                 'names' => array( 2 => 'LITERAL' ),
 154                                 'min' => 2,
 155                                 'max' => 2,
 156                         )
 157                 );
 158
 159                 $forInclusion = (bool)( $flags & Parser::PTD_FOR_INCLUSION );
 160
 161                 $xmlishElements = (array)$this->parser->getStripList();
 162                 $enableOnlyinclude = false;
 163                 if ( $forInclusion ) {
 164                         $ignoredTags = array( 'includeonly', '/includeonly' );
 165                         $ignoredElements = array( 'noinclude' );
 166                         $xmlishElements[] = 'noinclude';
 167                         if ( strpos( $text, '<onlyinclude>' ) !== false && strpos( $text, '</onlyinclude>' ) !== false ) {
 168                                 $enableOnlyinclude = true;
 169                         }
 170                 } else if ( $this->parser->ot['wiki'] ) {
 171                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude', 'includeonly', '/includeonly' );
 172                         $ignoredElements = array();
 173                 } else {
 174                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude' );
 175                         $ignoredElements = array( 'includeonly' );
 176                         $xmlishElements[] = 'includeonly';
 177                 }
 178                 $xmlishRegex = implode( '|', array_merge( $xmlishElements, $ignoredTags ) );
 179
 180                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
 181                 $elementsRegex = "~($xmlishRegex)(?:\s|\/>|>)|(!--)~iA";
 182
 183                 $stack = new PPDStack_HipHop;
 184
 185                 $searchBase = "[{<\n";
 186                 $revText = strrev( $text ); // For fast reverse searches
 187
 188                 $i = 0;                     # Input pointer, starts out pointing to a pseudo-newline before the start
 189                 $accum = $stack->getAccum();   # Current accumulator
 190                 $headingIndex = 1;
 191                 $stackFlags = array(
 192                         'findPipe' => false, # True to take notice of pipe characters
 193                         'findEquals' => false, # True to find equals signs in arguments
 194                         'inHeading' => false, # True if $i is inside a possible heading
 195                 );
 196                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
 197                 $findOnlyinclude = $enableOnlyinclude; # True to ignore all input up to the next <onlyinclude>
 198                 $fakeLineStart = true;     # Do a line-start run without outputting an LF character
 199
 200                 while ( true ) {
 201                         //$this->memCheck();
 202
 203                         if ( $findOnlyinclude ) {
 204                                 // Ignore all input up to the next <onlyinclude>
 205                                 $variantStartPos = strpos( $text, '<onlyinclude>', $i );
 206                                 if ( $variantStartPos === false ) {
 207                                         // Ignored section runs to the end
 208                                         $accum->addNodeWithText( 'ignore', strval( substr( $text, $i ) ) );
 209                                         break;
 210                                 }
 211                                 $startPos1 = intval( $variantStartPos );
 212                                 $tagEndPos = $startPos1 + strlen( '<onlyinclude>' ); // past-the-end
 213                                 $accum->addNodeWithText( 'ignore', strval( substr( $text, $i, $tagEndPos - $i ) ) );
 214                                 $i = $tagEndPos;
 215                                 $findOnlyinclude = false;
 216                         }
 217
 218                         if ( $fakeLineStart ) {
 219                                 $found = 'line-start';
 220                                 $curChar = '';
 221                         } else {
 222                                 # Find next opening brace, closing brace or pipe
 223                                 $search = $searchBase;
 224                                 if ( $stack->top === false ) {
 225                                         $currentClosing = '';
 226                                 } else {
 227                                         $currentClosing = strval( $stack->getTop()->close );
 228                                         $search .= $currentClosing;
 229                                 }
 230                                 if ( $stackFlags['findPipe'] ) {
 231                                         $search .= '|';
 232                                 }
 233                                 if ( $stackFlags['findEquals'] ) {
 234                                         // First equals will be for the template
 235                                         $search .= '=';
 236                                 }
 237                                 $rule = null;
 238                                 # Output literal section, advance input counter
 239                                 $literalLength = intval( strcspn( $text, $search, $i ) );
 240                                 if ( $literalLength > 0 ) {
 241                                         $accum->addLiteral( strval( substr( $text, $i, $literalLength ) ) );
 242                                         $i += $literalLength;
 243                                 }
 244                                 if ( $i >= $lengthText ) {
 245                                         if ( $currentClosing === "\n" ) {
 246                                                 // Do a past-the-end run to finish off the heading
 247                                                 $curChar = '';
 248                                                 $found = 'line-end';
 249                                         } else {
 250                                                 # All done
 251                                                 break;
 252                                         }
 253                                 } else {
 254                                         $curChar = $text[$i];
 255                                         if ( $curChar === '|' ) {
 256                                                 $found = 'pipe';
 257                                         } elseif ( $curChar === '=' ) {
 258                                                 $found = 'equals';
 259                                         } elseif ( $curChar === '<' ) {
 260                                                 $found = 'angle';
 261                                         } elseif ( $curChar === "\n" ) {
 262                                                 if ( $stackFlags['inHeading'] ) {
 263                                                         $found = 'line-end';
 264                                                 } else {
 265                                                         $found = 'line-start';
 266                                                 }
 267                                         } elseif ( $curChar === $currentClosing ) {
 268                                                 $found = 'close';
 269                                         } elseif ( isset( $rules[$curChar] ) ) {
 270                                                 $found = 'open';
 271                                                 $rule = $rules[$curChar];
 272                                         } else {
 273                                                 # Some versions of PHP have a strcspn which stops on null characters
 274                                                 # Ignore and continue
 275                                                 ++$i;
 276                                                 continue;
 277                                         }
 278                                 }
 279                         }
 280
 281                         if ( $found === 'angle' ) {
 282                                 $matches = false;
 283                                 // Handle </onlyinclude>
 284                                 if ( $enableOnlyinclude
 285                                         && substr( $text, $i, strlen( '</onlyinclude>' ) ) === '</onlyinclude>' )
 286                                 {
 287                                         $findOnlyinclude = true;
 288                                         continue;
 289                                 }
 290
 291                                 // Determine element name
 292                                 if ( !preg_match( $elementsRegex, $text, $matches, 0, $i + 1 ) ) {
 293                                         // Element name missing or not listed
 294                                         $accum->addLiteral( '<' );
 295                                         ++$i;
 296                                         continue;
 297                                 }
 298                                 // Handle comments
 299                                 if ( isset( $matches[2] ) && $matches[2] === '!--' ) {
 300                                         // To avoid leaving blank lines, when a comment is both preceded
 301                                         // and followed by a newline (ignoring spaces), trim leading and
 302                                         // trailing spaces and one of the newlines.
 303
 304                                         // Find the end
 305                                         $variantEndPos = strpos( $text, '-->', $i + 4 );
 306                                         if ( $variantEndPos === false ) {
 307                                                 // Unclosed comment in input, runs to end
 308                                                 $inner = strval( substr( $text, $i ) );
 309                                                 $accum->addNodeWithText( 'comment', $inner );
 310                                                 $i = $lengthText;
 311                                         } else {
 312                                                 $endPos = intval( $variantEndPos );
 313                                                 // Search backwards for leading whitespace
 314                                                 if ( $i ) {
 315                                                         $wsStart = $i - intval( strspn( $revText, ' ', $lengthText - $i ) );
 316                                                 } else {
 317                                                         $wsStart = 0;
 318                                                 }
 319                                                 // Search forwards for trailing whitespace
 320                                                 // $wsEnd will be the position of the last space (or the '>' if there's none)
 321                                                 $wsEnd = $endPos + 2 + intval( strspn( $text, ' ', $endPos + 3 ) );
 322                                                 // Eat the line if possible
 323                                                 // TODO: This could theoretically be done if $wsStart == 0, i.e. for comments at
 324                                                 // the overall start. That's not how Sanitizer::removeHTMLcomments() did it, but
 325                                                 // it's a possible beneficial b/c break.
 326                                                 if ( $wsStart > 0 && substr( $text, $wsStart - 1, 1 ) === "\n"
 327                                                         && substr( $text, $wsEnd + 1, 1 ) === "\n" )
 328                                                 {
 329                                                         $startPos2 = $wsStart;
 330                                                         $endPos = $wsEnd + 1;
 331                                                         // Remove leading whitespace from the end of the accumulator
 332                                                         // Sanity check first though
 333                                                         $wsLength = $i - $wsStart;
 334                                                         if ( $wsLength > 0
 335                                                                 && $accum->lastNode instanceof PPNode_HipHop_Text
 336                                                                 && substr( $accum->lastNode->value, -$wsLength ) === str_repeat( ' ', $wsLength ) )
 337                                                         {
 338                                                                 $accum->lastNode->value = strval( substr( $accum->lastNode->value, 0, -$wsLength ) );
 339                                                         }
 340                                                         // Do a line-start run next time to look for headings after the comment
 341                                                         $fakeLineStart = true;
 342                                                 } else {
 343                                                         // No line to eat, just take the comment itself
 344                                                         $startPos2 = $i;
 345                                                         $endPos += 2;
 346                                                 }
 347
 348                                                 if ( $stack->top ) {
 349                                                         $part = $stack->getTop()->getCurrentPart();
 350                                                         if ( ! (isset( $part->commentEnd ) && $part->commentEnd == $wsStart - 1 )) {
 351                                                                 $part->visualEnd = $wsStart;
 352                                                         }
 353                                                         // Else comments abutting, no change in visual end
 354                                                         $part->commentEnd = $endPos;
 355                                                 }
 356                                                 $i = $endPos + 1;
 357                                                 $inner = strval( substr( $text, $startPos2, $endPos - $startPos2 + 1 ) );
 358                                                 $accum->addNodeWithText( 'comment', $inner );
 359                                         }
 360                                         continue;
 361                                 }
 362                                 $name = strval( $matches[1] );
 363                                 $lowerName = strtolower( $name );
 364                                 $attrStart = $i + strlen( $name ) + 1;
 365
 366                                 // Find end of tag
 367                                 $variantTagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
 368                                 if ( $variantTagEndPos === false ) {
 369                                         // Infinite backtrack
 370                                         // Disable tag search to prevent worst-case O(N^2) performance
 371                                         $noMoreGT = true;
 372                                         $accum->addLiteral( '<' );
 373                                         ++$i;
 374                                         continue;
 375                                 }
 376                                 $tagEndPos = intval( $variantTagEndPos );
 377
 378                                 // Handle ignored tags
 379                                 if ( in_array( $lowerName, $ignoredTags ) ) {
 380                                         $accum->addNodeWithText( 'ignore', strval( substr( $text, $i, $tagEndPos - $i + 1 ) ) );
 381                                         $i = $tagEndPos + 1;
 382                                         continue;
 383                                 }
 384
 385                                 $tagStartPos = $i;
 386                                 $close = '';
 387                                 if ( $text[$tagEndPos-1] === '/' ) {
 388                                         // Short end tag
 389                                         $attrEnd = $tagEndPos - 1;
 390                                         $shortEnd = true;
 391                                         $inner = '';
 392                                         $i = $tagEndPos + 1;
 393                                         $haveClose = false;
 394                                 } else {
 395                                         $attrEnd = $tagEndPos;
 396                                         $shortEnd = false;
 397                                         // Find closing tag
 398                                         if ( preg_match( "/<\/" . preg_quote( $name, '/' ) . "\s*>/i",
 399                                                         $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) )
 400                                         {
 401                                                 $inner = strval( substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 ) );
 402                                                 $i = intval( $matches[0][1] ) + strlen( $matches[0][0] );
 403                                                 $close = strval( $matches[0][0] );
 404                                                 $haveClose = true;
 405                                         } else {
 406                                                 // No end tag -- let it run out to the end of the text.
 407                                                 $inner = strval( substr( $text, $tagEndPos + 1 ) );
 408                                                 $i = $lengthText;
 409                                                 $haveClose = false;
 410                                         }
 411                                 }
 412                                 // <includeonly> and <noinclude> just become <ignore> tags
 413                                 if ( in_array( $lowerName, $ignoredElements ) ) {
 414                                         $accum->addNodeWithText(  'ignore', strval( substr( $text, $tagStartPos, $i - $tagStartPos ) ) );
 415                                         continue;
 416                                 }
 417
 418                                 if ( $attrEnd <= $attrStart ) {
 419                                         $attr = '';
 420                                 } else {
 421                                         // Note that the attr element contains the whitespace between name and attribute,
 422                                         // this is necessary for precise reconstruction during pre-save transform.
 423                                         $attr = strval( substr( $text, $attrStart, $attrEnd - $attrStart ) );
 424                                 }
 425
 426                                 $extNode = new PPNode_HipHop_Tree( 'ext' );
 427                                 $extNode->addChild( PPNode_HipHop_Tree::newWithText( 'name', $name ) );
 428                                 $extNode->addChild( PPNode_HipHop_Tree::newWithText( 'attr', $attr ) );
 429                                 if ( !$shortEnd ) {
 430                                         $extNode->addChild( PPNode_HipHop_Tree::newWithText( 'inner', $inner ) );
 431                                 }
 432                                 if ( $haveClose ) {
 433                                         $extNode->addChild( PPNode_HipHop_Tree::newWithText( 'close', $close ) );
 434                                 }
 435                                 $accum->addNode( $extNode );
 436                         }
 437
 438                         elseif ( $found === 'line-start' ) {
 439                                 // Is this the start of a heading?
 440                                 // Line break belongs before the heading element in any case
 441                                 if ( $fakeLineStart ) {
 442                                         $fakeLineStart = false;
 443                                 } else {
 444                                         $accum->addLiteral( $curChar );
 445                                         $i++;
 446                                 }
 447
 448                                 $count = intval( strspn( $text, '=', $i, 6 ) );
 449                                 if ( $count == 1 && $stackFlags['findEquals'] ) {
 450                                         // DWIM: This looks kind of like a name/value separator
 451                                         // Let's let the equals handler have it and break the potential heading
 452                                         // This is heuristic, but AFAICT the methods for completely correct disambiguation are very complex.
 453                                 } elseif ( $count > 0 ) {
 454                                         $partData = array(
 455                                                 'open' => "\n",
 456                                                 'close' => "\n",
 457                                                 'parts' => array( new PPDPart_HipHop( str_repeat( '=', $count ) ) ),
 458                                                 'startPos' => $i,
 459                                                 'count' => $count );
 460                                         $stack->push( $partData );
 461                                         $accum = $stack->getAccum();
 462                                         $stackFlags = $stack->getFlags();
 463                                         $i += $count;
 464                                 }
 465                         } elseif ( $found === 'line-end' ) {
 466                                 $piece = $stack->getTop();
 467                                 // A heading must be open, otherwise \n wouldn't have been in the search list
 468                                 assert( $piece->open === "\n" ); // Passing the assert condition directly instead of string, as
 469                                                                  // HPHP /compiler/ chokes on strings when ASSERT_ACTIVE != 0.
 470                                 $part = $piece->getCurrentPart();
 471                                 // Search back through the input to see if it has a proper close
 472                                 // Do this using the reversed string since the other solutions (end anchor, etc.) are inefficient
 473                                 $wsLength = intval( strspn( $revText, " \t", $lengthText - $i ) );
 474                                 $searchStart = $i - $wsLength;
 475                                 if ( isset( $part->commentEnd ) && $searchStart - 1 == $part->commentEnd ) {
 476                                         // Comment found at line end
 477                                         // Search for equals signs before the comment
 478                                         $searchStart = intval( $part->visualEnd );
 479                                         $searchStart -= intval( strspn( $revText, " \t", $lengthText - $searchStart ) );
 480                                 }
 481                                 $count = intval( $piece->count );
 482                                 $equalsLength = intval( strspn( $revText, '=', $lengthText - $searchStart ) );
 483                                 $isTreeNode = false;
 484                                 $resultAccum = $accum;
 485                                 if ( $equalsLength > 0 ) {
 486                                         if ( $searchStart - $equalsLength == $piece->startPos ) {
 487                                                 // This is just a single string of equals signs on its own line
 488                                                 // Replicate the doHeadings behaviour /={count}(.+)={count}/
 489                                                 // First find out how many equals signs there really are (don't stop at 6)
 490                                                 $count = $equalsLength;
 491                                                 if ( $count < 3 ) {
 492                                                         $count = 0;
 493                                                 } else {
 494                                                         $count = intval( ( $count - 1 ) / 2 );
 495                                                         if ( $count > 6 ) {
 496                                                                 $count = 6;
 497                                                         }
 498                                                 }
 499                                         } else {
 500                                                 if ( $count > $equalsLength ) {
 501                                                         $count = $equalsLength;
 502                                                 }
 503                                         }
 504                                         if ( $count > 0 ) {
 505                                                 // Normal match, output <h>
 506                                                 $tree = new PPNode_HipHop_Tree( 'possible-h' );
 507                                                 $tree->addChild( new PPNode_HipHop_Attr( 'level', $count ) );
 508                                                 $tree->addChild( new PPNode_HipHop_Attr( 'i', $headingIndex++ ) );
 509                                                 $tree->lastChild->nextSibling = $accum->firstNode;
 510                                                 $tree->lastChild = $accum->lastNode;
 511                                                 $isTreeNode = true;
 512                                         } else {
 513                                                 // Single equals sign on its own line, count=0
 514                                                 // Output $resultAccum
 515                                         }
 516                                 } else {
 517                                         // No match, no <h>, just pass down the inner text
 518                                         // Output $resultAccum
 519                                 }
 520                                 // Unwind the stack
 521                                 $stack->pop();
 522                                 $accum = $stack->getAccum();
 523                                 $stackFlags = $stack->getFlags();
 524
 525                                 // Append the result to the enclosing accumulator
 526                                 if ( $isTreeNode ) {
 527                                         $accum->addNode( $tree );
 528                                 } else {
 529                                         $accum->addAccum( $resultAccum );
 530                                 }
 531                                 // Note that we do NOT increment the input pointer.
 532                                 // This is because the closing linebreak could be the opening linebreak of
 533                                 // another heading. Infinite loops are avoided because the next iteration MUST
 534                                 // hit the heading open case above, which unconditionally increments the
 535                                 // input pointer.
 536                         } elseif ( $found === 'open' ) {
 537                                 # count opening brace characters
 538                                 $count = intval( strspn( $text, $curChar, $i ) );
 539
 540                                 # we need to add to stack only if opening brace count is enough for one of the rules
 541                                 if ( $count >= $rule['min'] ) {
 542                                         # Add it to the stack
 543                                         $partData = array(
 544                                                 'open' => $curChar,
 545                                                 'close' => $rule['end'],
 546                                                 'count' => $count,
 547                                                 'lineStart' => ($i == 0 || $text[$i-1] === "\n"),
 548                                         );
 549
 550                                         $stack->push( $partData );
 551                                         $accum = $stack->getAccum();
 552                                         $stackFlags = $stack->getFlags();
 553                                 } else {
 554                                         # Add literal brace(s)
 555                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 556                                 }
 557                                 $i += $count;
 558                         } elseif ( $found === 'close' ) {
 559                                 $piece = $stack->getTop();
 560                                 # lets check if there are enough characters for closing brace
 561                                 $maxCount = intval( $piece->count );
 562                                 $count = intval( strspn( $text, $curChar, $i, $maxCount ) );
 563
 564                                 # check for maximum matching characters (if there are 5 closing
 565                                 # characters, we will probably need only 3 - depending on the rules)
 566                                 $rule = $rules[$piece->open];
 567                                 if ( $count > $rule['max'] ) {
 568                                         # The specified maximum exists in the callback array, unless the caller
 569                                         # has made an error
 570                                         $matchingCount = intval( $rule['max'] );
 571                                 } else {
 572                                         # Count is less than the maximum
 573                                         # Skip any gaps in the callback array to find the true largest match
 574                                         # Need to use array_key_exists not isset because the callback can be null
 575                                         $matchingCount = $count;
 576                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
 577                                                 --$matchingCount;
 578                                         }
 579                                 }
 580
 581                                 if ($matchingCount <= 0) {
 582                                         # No matching element found in callback array
 583                                         # Output a literal closing brace and continue
 584                                         $accum->addLiteral( str_repeat( $curChar, $count ) );
 585                                         $i += $count;
 586                                         continue;
 587                                 }
 588                                 $name = strval( $rule['names'][$matchingCount] );
 589                                 $isTreeNode = false;
 590                                 if ( $name === 'LITERAL' ) {
 591                                         // No element, just literal text
 592                                         $resultAccum = $piece->breakSyntax( $matchingCount );
 593                                         $resultAccum->addLiteral( str_repeat( $rule['end'], $matchingCount ) );
 594                                 } else {
 595                                         # Create XML element
 596                                         # Note: $parts is already XML, does not need to be encoded further
 597                                         $isTreeNode = true;
 598                                         $parts = $piece->parts;
 599                                         $titleAccum = PPDAccum_HipHop::cast( $parts[0]->out );
 600                                         unset( $parts[0] );
 601
 602                                         $tree = new PPNode_HipHop_Tree( $name );
 603
 604                                         # The invocation is at the start of the line if lineStart is set in
 605                                         # the stack, and all opening brackets are used up.
 606                                         if ( $maxCount == $matchingCount && !empty( $piece->lineStart ) ) {
 607                                                 $tree->addChild( new PPNode_HipHop_Attr( 'lineStart', 1 ) );
 608                                         }
 609                                         $titleNode = new PPNode_HipHop_Tree( 'title' );
 610                                         $titleNode->firstChild = $titleAccum->firstNode;
 611                                         $titleNode->lastChild = $titleAccum->lastNode;
 612                                         $tree->addChild( $titleNode );
 613                                         $argIndex = 1;
 614                                         foreach ( $parts as $variantPart ) {
 615                                                 $part = PPDPart_HipHop::cast( $variantPart );
 616                                                 if ( isset( $part->eqpos ) ) {
 617                                                         // Find equals
 618                                                         $lastNode = false;
 619                                                         for ( $node = $part->out->firstNode; $node; $node = $node->nextSibling ) {
 620                                                                 if ( $node === $part->eqpos ) {
 621                                                                         break;
 622                                                                 }
 623                                                                 $lastNode = $node;
 624                                                         }
 625                                                         if ( !$node ) {
 626                                                                 throw new MWException( __METHOD__. ': eqpos not found' );
 627                                                         }
 628                                                         if ( $node->name !== 'equals' ) {
 629                                                                 throw new MWException( __METHOD__ .': eqpos is not equals' );
 630                                                         }
 631                                                         $equalsNode = $node;
 632
 633                                                         // Construct name node
 634                                                         $nameNode = new PPNode_HipHop_Tree( 'name' );
 635                                                         if ( $lastNode !== false ) {
 636                                                                 $lastNode->nextSibling = false;
 637                                                                 $nameNode->firstChild = $part->out->firstNode;
 638                                                                 $nameNode->lastChild = $lastNode;
 639                                                         }
 640
 641                                                         // Construct value node
 642                                                         $valueNode = new PPNode_HipHop_Tree( 'value' );
 643                                                         if ( $equalsNode->nextSibling !== false ) {
 644                                                                 $valueNode->firstChild = $equalsNode->nextSibling;
 645                                                                 $valueNode->lastChild = $part->out->lastNode;
 646                                                         }
 647                                                         $partNode = new PPNode_HipHop_Tree( 'part' );
 648                                                         $partNode->addChild( $nameNode );
 649                                                         $partNode->addChild( $equalsNode->firstChild );
 650                                                         $partNode->addChild( $valueNode );
 651                                                         $tree->addChild( $partNode );
 652                                                 } else {
 653                                                         $partNode = new PPNode_HipHop_Tree( 'part' );
 654                                                         $nameNode = new PPNode_HipHop_Tree( 'name' );
 655                                                         $nameNode->addChild( new PPNode_HipHop_Attr( 'index', $argIndex++ ) );
 656                                                         $valueNode = new PPNode_HipHop_Tree( 'value' );
 657                                                         $valueNode->firstChild = $part->out->firstNode;
 658                                                         $valueNode->lastChild = $part->out->lastNode;
 659                                                         $partNode->addChild( $nameNode );
 660                                                         $partNode->addChild( $valueNode );
 661                                                         $tree->addChild( $partNode );
 662                                                 }
 663                                         }
 664                                 }
 665
 666                                 # Advance input pointer
 667                                 $i += $matchingCount;
 668
 669                                 # Unwind the stack
 670                                 $stack->pop();
 671                                 $accum = $stack->getAccum();
 672
 673                                 # Re-add the old stack element if it still has unmatched opening characters remaining
 674                                 if ($matchingCount < $piece->count) {
 675                                         $piece->parts = array( new PPDPart_HipHop );
 676                                         $piece->count -= $matchingCount;
 677                                         # do we still qualify for any callback with remaining count?
 678                                         $names = $rules[$piece->open]['names'];
 679                                         $skippedBraces = 0;
 680                                         $enclosingAccum = $accum;
 681                                         while ( $piece->count ) {
 682                                                 if ( array_key_exists( $piece->count, $names ) ) {
 683                                                         $stack->push( $piece );
 684                                                         $accum = $stack->getAccum();
 685                                                         break;
 686                                                 }
 687                                                 --$piece->count;
 688                                                 $skippedBraces ++;
 689                                         }
 690                                         $enclosingAccum->addLiteral( str_repeat( $piece->open, $skippedBraces ) );
 691                                 }
 692
 693                                 $stackFlags = $stack->getFlags();
 694
 695                                 # Add XML element to the enclosing accumulator
 696                                 if ( $isTreeNode ) {
 697                                         $accum->addNode( $tree );
 698                                 } else {
 699                                         $accum->addAccum( $resultAccum );
 700                                 }
 701                         } elseif ( $found === 'pipe' ) {
 702                                 $stackFlags['findEquals'] = true; // shortcut for getFlags()
 703                                 $stack->addPart();
 704                                 $accum = $stack->getAccum();
 705                                 ++$i;
 706                         } elseif ( $found === 'equals' ) {
 707                                 $stackFlags['findEquals'] = false; // shortcut for getFlags()
 708                                 $accum->addNodeWithText( 'equals', '=' );
 709                                 $stack->getCurrentPart()->eqpos = $accum->lastNode;
 710                                 ++$i;
 711                         }
 712                 }
 713
 714                 # Output any remaining unclosed brackets
 715                 foreach ( $stack->stack as $variantPiece ) {
 716                         $piece = PPDStackElement_HipHop::cast( $variantPiece );
 717                         $stack->rootAccum->addAccum( $piece->breakSyntax() );
 718                 }
 719
 720                 # Enable top-level headings
 721                 for ( $node = $stack->rootAccum->firstNode; $node; $node = $node->nextSibling ) {
 722                         if ( isset( $node->name ) && $node->name === 'possible-h' ) {
 723                                 $node->name = 'h';
 724                         }
 725                 }
 726
 727                 $rootNode = new PPNode_HipHop_Tree( 'root' );
 728                 $rootNode->firstChild = $stack->rootAccum->firstNode;
 729                 $rootNode->lastChild = $stack->rootAccum->lastNode;
 730
 731                 // Cache
 732                 if ($cacheable) {
 733                         $cacheValue = sprintf( "%08d", self::CACHE_VERSION ) . serialize( $rootNode );
 734                         $wgMemc->set( $cacheKey, $cacheValue, 86400 );
 735                         wfProfileOut( __METHOD__.'-cache-miss' );
 736                         wfProfileOut( __METHOD__.'-cacheable' );
 737                         wfDebugLog( "Preprocessor", "Saved preprocessor Hash to memcached (key $cacheKey)" );
 738                 }
 739
 740                 wfProfileOut( __METHOD__ );
 741                 return $rootNode;
 742         }
 743 }
 744
 745
 746
 747 /**
 748  * Stack class to help Preprocessor::preprocessToObj()
 749  * @ingroup Parser
 750  */
 751 class PPDStack_HipHop {
 752         var $stack, $rootAccum;
 753
 754         /**
 755          * @var PPDStack
 756          */
 757         var $top;
 758         var $out;
 759
 760         static $false = false;
 761
 762         function __construct() {
 763                 $this->stack = array();
 764                 $this->top = false;
 765                 $this->rootAccum = new PPDAccum_HipHop;
 766                 $this->accum = $this->rootAccum;
 767         }
 768
 769         /**
 770          * @return int
 771          */
 772         function count() {
 773                 return count( $this->stack );
 774         }
 775
 776         function getAccum() {
 777                 return PPDAccum_HipHop::cast( $this->accum );
 778         }
 779
 780         function getCurrentPart() {
 781                 return $this->getTop()->getCurrentPart();
 782         }
 783
 784         function getTop() {
 785                 return PPDStackElement_HipHop::cast( $this->top );
 786         }
 787
 788         function push( $data ) {
 789                 if ( $data instanceof PPDStackElement_HipHop ) {
 790                         $this->stack[] = $data;
 791                 } else {
 792                         $this->stack[] = new PPDStackElement_HipHop( $data );
 793                 }
 794                 $this->top = $this->stack[ count( $this->stack ) - 1 ];
 795                 $this->accum = $this->top->getAccum();
 796         }
 797
 798         function pop() {
 799                 if ( !count( $this->stack ) ) {
 800                         throw new MWException( __METHOD__.': no elements remaining' );
 801                 }
 802                 $temp = array_pop( $this->stack );
 803
 804                 if ( count( $this->stack ) ) {
 805                         $this->top = $this->stack[ count( $this->stack ) - 1 ];
 806                         $this->accum = $this->top->getAccum();
 807                 } else {
 808                         $this->top = self::$false;
 809                         $this->accum = $this->rootAccum;
 810                 }
 811                 return $temp;
 812         }
 813
 814         function addPart( $s = '' ) {
 815                 $this->top->addPart( $s );
 816                 $this->accum = $this->top->getAccum();
 817         }
 818
 819         /**
 820          * @return array
 821          */
 822         function getFlags() {
 823                 if ( !count( $this->stack ) ) {
 824                         return array(
 825                                 'findEquals' => false,
 826                                 'findPipe' => false,
 827                                 'inHeading' => false,
 828                         );
 829                 } else {
 830                         return $this->top->getFlags();
 831                 }
 832         }
 833 }
 834
 835 /**
 836  * @ingroup Parser
 837  */
 838 class PPDStackElement_HipHop {
 839         var $open,              // Opening character (\n for heading)
 840                 $close,             // Matching closing character
 841                 $count,             // Number of opening characters found (number of "=" for heading)
 842                 $parts,             // Array of PPDPart objects describing pipe-separated parts.
 843                 $lineStart;         // True if the open char appeared at the start of the input line. Not set for headings.
 844
 845         /**
 846          * @param $obj PPDStackElement_HipHop
 847          * @return PPDStackElement_HipHop
 848          */
 849         static function cast( PPDStackElement_HipHop $obj ) {
 850                 return $obj;
 851         }
 852
 853         /**
 854          * @param $data array
 855          */
 856         function __construct( $data = array() ) {
 857                 $this->parts = array( new PPDPart_HipHop );
 858
 859                 foreach ( $data as $name => $value ) {
 860                         $this->$name = $value;
 861                 }
 862         }
 863
 864         /**
 865          * @return PPDAccum_HipHop
 866          */
 867         function getAccum() {
 868                 return PPDAccum_HipHop::cast( $this->parts[count($this->parts) - 1]->out );
 869         }
 870
 871         /**
 872          * @param $s string
 873          */
 874         function addPart( $s = '' ) {
 875                 $this->parts[] = new PPDPart_HipHop( $s );
 876         }
 877
 878         /**
 879          * @return PPDPart_HipHop
 880          */
 881         function getCurrentPart() {
 882                 return PPDPart_HipHop::cast( $this->parts[count($this->parts) - 1] );
 883         }
 884
 885         /**
 886          * @return array
 887          */
 888         function getFlags() {
 889                 $partCount = count( $this->parts );
 890                 $findPipe = $this->open !== "\n" && $this->open !== '[';
 891                 return array(
 892                         'findPipe' => $findPipe,
 893                         'findEquals' => $findPipe && $partCount > 1 && !isset( $this->parts[$partCount - 1]->eqpos ),
 894                         'inHeading' => $this->open === "\n",
 895                 );
 896         }
 897
 898         /**
 899          * Get the accumulator that would result if the close is not found.
 900          *
 901          * @param $openingCount bool
 902          * @return PPDAccum_HipHop
 903          */
 904         function breakSyntax( $openingCount = false ) {
 905                 if ( $this->open === "\n" ) {
 906                         $accum = PPDAccum_HipHop::cast( $this->parts[0]->out );
 907                 } else {
 908                         if ( $openingCount === false ) {
 909                                 $openingCount = $this->count;
 910                         }
 911                         $accum = new PPDAccum_HipHop;
 912                         $accum->addLiteral( str_repeat( $this->open, $openingCount ) );
 913                         $first = true;
 914                         foreach ( $this->parts as $part ) {
 915                                 if ( $first ) {
 916                                         $first = false;
 917                                 } else {
 918                                         $accum->addLiteral( '|' );
 919                                 }
 920                                 $accum->addAccum( $part->out );
 921                         }
 922                 }
 923                 return $accum;
 924         }
 925 }
 926
 927 /**
 928  * @ingroup Parser
 929  */
 930 class PPDPart_HipHop {
 931         var $out; // Output accumulator object
 932
 933         // Optional member variables:
 934         //   eqpos        Position of equals sign in output accumulator
 935         //   commentEnd   Past-the-end input pointer for the last comment encountered
 936         //   visualEnd    Past-the-end input pointer for the end of the accumulator minus comments
 937
 938         function __construct( $out = '' ) {
 939                 $this->out = new PPDAccum_HipHop;
 940                 if ( $out !== '' ) {
 941                         $this->out->addLiteral( $out );
 942                 }
 943         }
 944
 945         static function cast( PPDPart_HipHop $obj ) {
 946                 return $obj;
 947         }
 948 }
 949
 950 /**
 951  * @ingroup Parser
 952  */
 953 class PPDAccum_HipHop {
 954         var $firstNode, $lastNode;
 955
 956         function __construct() {
 957                 $this->firstNode = $this->lastNode = false;
 958         }
 959
 960         static function cast( PPDAccum_HipHop $obj ) {
 961                 return $obj;
 962         }
 963
 964         /**
 965          * Append a string literal
 966          */
 967         function addLiteral( string $s ) {
 968                 if ( $this->lastNode === false ) {
 969                         $this->firstNode = $this->lastNode = new PPNode_HipHop_Text( $s );
 970                 } elseif ( $this->lastNode instanceof PPNode_HipHop_Text ) {
 971                         $this->lastNode->value .= $s;
 972                 } else {
 973                         $this->lastNode->nextSibling = new PPNode_HipHop_Text( $s );
 974                         $this->lastNode = $this->lastNode->nextSibling;
 975                 }
 976         }
 977
 978         /**
 979          * Append a PPNode
 980          */
 981         function addNode( PPNode $node ) {
 982                 if ( $this->lastNode === false ) {
 983                         $this->firstNode = $this->lastNode = $node;
 984                 } else {
 985                         $this->lastNode->nextSibling = $node;
 986                         $this->lastNode = $node;
 987                 }
 988         }
 989
 990         /**
 991          * Append a tree node with text contents
 992          */
 993         function addNodeWithText( string $name, string $value ) {
 994                 $node = PPNode_HipHop_Tree::newWithText( $name, $value );
 995                 $this->addNode( $node );
 996         }
 997
 998         /**
 999          * Append a PPDAccum_HipHop
1000          * Takes over ownership of the nodes in the source argument. These nodes may
1001          * subsequently be modified, especially nextSibling.
1002          */
1003         function addAccum( PPDAccum_HipHop $accum ) {
1004                 if ( $accum->lastNode === false ) {
1005                         // nothing to add
1006                 } elseif ( $this->lastNode === false ) {
1007                         $this->firstNode = $accum->firstNode;
1008                         $this->lastNode = $accum->lastNode;
1009                 } else {
1010                         $this->lastNode->nextSibling = $accum->firstNode;
1011                         $this->lastNode = $accum->lastNode;
1012                 }
1013         }
1014 }
1015
1016 /**
1017  * An expansion frame, used as a context to expand the result of preprocessToObj()
1018  * @ingroup Parser
1019  */
1020 class PPFrame_HipHop implements PPFrame {
1021
1022         /**
1023          * @var Parser
1024          */
1025         var $parser;
1026
1027         /**
1028          * @var Preprocessor
1029          */
1030         var $preprocessor;
1031
1032         /**
1033          * @var Title
1034          */
1035         var $title;
1036         var $titleCache;
1037
1038         /**
1039          * Hashtable listing templates which are disallowed for expansion in this frame,
1040          * having been encountered previously in parent frames.
1041          */
1042         var $loopCheckHash;
1043
1044         /**
1045          * Recursion depth of this frame, top = 0
1046          * Note that this is NOT the same as expansion depth in expand()
1047          */
1048         var $depth;
1049
1050         /**
1051          * Construct a new preprocessor frame.
1052          * @param $preprocessor Preprocessor: the parent preprocessor
1053          */
1054         function __construct( $preprocessor ) {
1055                 $this->preprocessor = $preprocessor;
1056                 $this->parser = $preprocessor->parser;
1057                 $this->title = $this->parser->mTitle;
1058                 $this->titleCache = array( $this->title ? $this->title->getPrefixedDBkey() : false );
1059                 $this->loopCheckHash = array();
1060                 $this->depth = 0;
1061         }
1062
1063         /**
1064          * Create a new child frame
1065          * $args is optionally a multi-root PPNode or array containing the template arguments
1066          *
1067          * @param $args PPNode_HipHop_Array|array|bool
1068          * @param $title Title|bool
1069          *
1070          * @throws MWException
1071          * @return PPTemplateFrame_HipHop
1072          */
1073         function newChild( $args = false, $title = false ) {
1074                 $namedArgs = array();
1075                 $numberedArgs = array();
1076                 if ( $title === false ) {
1077                         $title = $this->title;
1078                 }
1079                 if ( $args !== false ) {
1080                         if ( $args instanceof PPNode_HipHop_Array ) {
1081                                 $args = $args->value;
1082                         } elseif ( !is_array( $args ) ) {
1083                                 throw new MWException( __METHOD__ . ': $args must be array or PPNode_HipHop_Array' );
1084                         }
1085                         foreach ( $args as $arg ) {
1086                                 $bits = $arg->splitArg();
1087                                 if ( $bits['index'] !== '' ) {
1088                                         // Numbered parameter
1089                                         $numberedArgs[$bits['index']] = $bits['value'];
1090                                         unset( $namedArgs[$bits['index']] );
1091                                 } else {
1092                                         // Named parameter
1093                                         $name = trim( $this->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
1094                                         $namedArgs[$name] = $bits['value'];
1095                                         unset( $numberedArgs[$name] );
1096                                 }
1097                         }
1098                 }
1099                 return new PPTemplateFrame_HipHop( $this->preprocessor, $this, $numberedArgs, $namedArgs, $title );
1100         }
1101
1102         /**
1103          * @throws MWException
1104          * @param $root
1105          * @param $flags int
1106          * @return string
1107          */
1108         function expand( $root, $flags = 0 ) {
1109                 static $expansionDepth = 0;
1110                 if ( is_string( $root ) ) {
1111                         return $root;
1112                 }
1113
1114                 if ( ++$this->parser->mPPNodeCount > $this->parser->mOptions->getMaxPPNodeCount() ) {
1115                         $this->parser->limitationWarn( 'node-count-exceeded',
1116                                         $this->parser->mPPNodeCount,
1117                                         $this->parser->mOptions->getMaxPPNodeCount()
1118                         );
1119                         return '<span class="error">Node-count limit exceeded</span>';
1120                 }
1121                 if ( $expansionDepth > $this->parser->mOptions->getMaxPPExpandDepth() ) {
1122                         $this->parser->limitationWarn( 'expansion-depth-exceeded',
1123                                         $expansionDepth,
1124                                         $this->parser->mOptions->getMaxPPExpandDepth()
1125                         );
1126                         return '<span class="error">Expansion depth limit exceeded</span>';
1127                 }
1128                 ++$expansionDepth;
1129                 if ( $expansionDepth > $this->parser->mHighestExpansionDepth ) {
1130                         $this->parser->mHighestExpansionDepth = $expansionDepth;
1131                 }
1132
1133                 $outStack = array( '', '' );
1134                 $iteratorStack = array( false, $root );
1135                 $indexStack = array( 0, 0 );
1136
1137                 while ( count( $iteratorStack ) > 1 ) {
1138                         $level = count( $outStack ) - 1;
1139                         $iteratorNode =& $iteratorStack[ $level ];
1140                         $out =& $outStack[$level];
1141                         $index =& $indexStack[$level];
1142
1143                         if ( is_array( $iteratorNode ) ) {
1144                                 if ( $index >= count( $iteratorNode ) ) {
1145                                         // All done with this iterator
1146                                         $iteratorStack[$level] = false;
1147                                         $contextNode = false;
1148                                 } else {
1149                                         $contextNode = $iteratorNode[$index];
1150                                         $index++;
1151                                 }
1152                         } elseif ( $iteratorNode instanceof PPNode_HipHop_Array ) {
1153                                 if ( $index >= $iteratorNode->getLength() ) {
1154                                         // All done with this iterator
1155                                         $iteratorStack[$level] = false;
1156                                         $contextNode = false;
1157                                 } else {
1158                                         $contextNode = $iteratorNode->item( $index );
1159                                         $index++;
1160                                 }
1161                         } else {
1162                                 // Copy to $contextNode and then delete from iterator stack,
1163                                 // because this is not an iterator but we do have to execute it once
1164                                 $contextNode = $iteratorStack[$level];
1165                                 $iteratorStack[$level] = false;
1166                         }
1167
1168                         $newIterator = false;
1169
1170                         if ( $contextNode === false ) {
1171                                 // nothing to do
1172                         } elseif ( is_string( $contextNode ) ) {
1173                                 $out .= $contextNode;
1174                         } elseif ( is_array( $contextNode ) || $contextNode instanceof PPNode_HipHop_Array ) {
1175                                 $newIterator = $contextNode;
1176                         } elseif ( $contextNode instanceof PPNode_HipHop_Attr ) {
1177                                 // No output
1178                         } elseif ( $contextNode instanceof PPNode_HipHop_Text ) {
1179                                 $out .= $contextNode->value;
1180                         } elseif ( $contextNode instanceof PPNode_HipHop_Tree ) {
1181                                 if ( $contextNode->name === 'template' ) {
1182                                         # Double-brace expansion
1183                                         $bits = $contextNode->splitTemplate();
1184                                         if ( $flags & PPFrame::NO_TEMPLATES ) {
1185                                                 $newIterator = $this->virtualBracketedImplode( '{{', '|', '}}', $bits['title'], $bits['parts'] );
1186                                         } else {
1187                                                 $ret = $this->parser->braceSubstitution( $bits, $this );
1188                                                 if ( isset( $ret['object'] ) ) {
1189                                                         $newIterator = $ret['object'];
1190                                                 } else {
1191                                                         $out .= $ret['text'];
1192                                                 }
1193                                         }
1194                                 } elseif ( $contextNode->name === 'tplarg' ) {
1195                                         # Triple-brace expansion
1196                                         $bits = $contextNode->splitTemplate();
1197                                         if ( $flags & PPFrame::NO_ARGS ) {
1198                                                 $newIterator = $this->virtualBracketedImplode( '{{{', '|', '}}}', $bits['title'], $bits['parts'] );
1199                                         } else {
1200                                                 $ret = $this->parser->argSubstitution( $bits, $this );
1201                                                 if ( isset( $ret['object'] ) ) {
1202                                                         $newIterator = $ret['object'];
1203                                                 } else {
1204                                                         $out .= $ret['text'];
1205                                                 }
1206                                         }
1207                                 } elseif ( $contextNode->name === 'comment' ) {
1208                                         # HTML-style comment
1209                                         # Remove it in HTML, pre+remove and STRIP_COMMENTS modes
1210                                         if ( $this->parser->ot['html']
1211                                                 || ( $this->parser->ot['pre'] && $this->parser->mOptions->getRemoveComments() )
1212                                                 || ( $flags & PPFrame::STRIP_COMMENTS ) )
1213                                         {
1214                                                 $out .= '';
1215                                         }
1216                                         # Add a strip marker in PST mode so that pstPass2() can run some old-fashioned regexes on the result
1217                                         # Not in RECOVER_COMMENTS mode (extractSections) though
1218                                         elseif ( $this->parser->ot['wiki'] && ! ( $flags & PPFrame::RECOVER_COMMENTS ) ) {
1219                                                 $out .= $this->parser->insertStripItem( $contextNode->firstChild->value );
1220                                         }
1221                                         # Recover the literal comment in RECOVER_COMMENTS and pre+no-remove
1222                                         else {
1223                                                 $out .= $contextNode->firstChild->value;
1224                                         }
1225                                 } elseif ( $contextNode->name === 'ignore' ) {
1226                                         # Output suppression used by <includeonly> etc.
1227                                         # OT_WIKI will only respect <ignore> in substed templates.
1228                                         # The other output types respect it unless NO_IGNORE is set.
1229                                         # extractSections() sets NO_IGNORE and so never respects it.
1230                                         if ( ( !isset( $this->parent ) && $this->parser->ot['wiki'] ) || ( $flags & PPFrame::NO_IGNORE ) ) {
1231                                                 $out .= $contextNode->firstChild->value;
1232                                         } else {
1233                                                 //$out .= '';
1234                                         }
1235                                 } elseif ( $contextNode->name === 'ext' ) {
1236                                         # Extension tag
1237                                         $bits = $contextNode->splitExt() + array( 'attr' => null, 'inner' => null, 'close' => null );
1238                                         $out .= $this->parser->extensionSubstitution( $bits, $this );
1239                                 } elseif ( $contextNode->name === 'h' ) {
1240                                         # Heading
1241                                         if ( $this->parser->ot['html'] ) {
1242                                                 # Expand immediately and insert heading index marker
1243                                                 $s = '';
1244                                                 for ( $node = $contextNode->firstChild; $node; $node = $node->nextSibling ) {
1245                                                         $s .= $this->expand( $node, $flags );
1246                                                 }
1247
1248                                                 $bits = $contextNode->splitHeading();
1249                                                 $titleText = $this->title->getPrefixedDBkey();
1250                                                 $this->parser->mHeadings[] = array( $titleText, $bits['i'] );
1251                                                 $serial = count( $this->parser->mHeadings ) - 1;
1252                                                 $marker = "{$this->parser->mUniqPrefix}-h-$serial-" . Parser::MARKER_SUFFIX;
1253                                                 $s = substr( $s, 0, $bits['level'] ) . $marker . substr( $s, $bits['level'] );
1254                                                 $this->parser->mStripState->addGeneral( $marker, '' );
1255                                                 $out .= $s;
1256                                         } else {
1257                                                 # Expand in virtual stack
1258                                                 $newIterator = $contextNode->getChildren();
1259                                         }
1260                                 } else {
1261                                         # Generic recursive expansion
1262                                         $newIterator = $contextNode->getChildren();
1263                                 }
1264                         } else {
1265                                 throw new MWException( __METHOD__.': Invalid parameter type' );
1266                         }
1267
1268                         if ( $newIterator !== false ) {
1269                                 $outStack[] = '';
1270                                 $iteratorStack[] = $newIterator;
1271                                 $indexStack[] = 0;
1272                         } elseif ( $iteratorStack[$level] === false ) {
1273                                 // Return accumulated value to parent
1274                                 // With tail recursion
1275                                 while ( $iteratorStack[$level] === false && $level > 0 ) {
1276                                         $outStack[$level - 1] .= $out;
1277                                         array_pop( $outStack );
1278                                         array_pop( $iteratorStack );
1279                                         array_pop( $indexStack );
1280                                         $level--;
1281                                 }
1282                         }
1283                 }
1284                 --$expansionDepth;
1285                 return $outStack[0];
1286         }
1287
1288         /**
1289          * @param $sep
1290          * @param $flags
1291          * @return string
1292          */
1293         function implodeWithFlags( $sep, $flags /*, ... */ ) {
1294                 $args = array_slice( func_get_args(), 2 );
1295
1296                 $first = true;
1297                 $s = '';
1298                 foreach ( $args as $root ) {
1299                         if ( $root instanceof PPNode_HipHop_Array ) {
1300                                 $root = $root->value;
1301                         }
1302                         if ( !is_array( $root ) ) {
1303                                 $root = array( $root );
1304                         }
1305                         foreach ( $root as $node ) {
1306                                 if ( $first ) {
1307                                         $first = false;
1308                                 } else {
1309                                         $s .= $sep;
1310                                 }
1311                                 $s .= $this->expand( $node, $flags );
1312                         }
1313                 }
1314                 return $s;
1315         }
1316
1317         /**
1318          * Implode with no flags specified
1319          * This previously called implodeWithFlags but has now been inlined to reduce stack depth
1320          * @param $sep
1321          * @return string
1322          */
1323         function implode( $sep /*, ... */ ) {
1324                 $args = array_slice( func_get_args(), 1 );
1325
1326                 $first = true;
1327                 $s = '';
1328                 foreach ( $args as $root ) {
1329                         if ( $root instanceof PPNode_HipHop_Array ) {
1330                                 $root = $root->value;
1331                         }
1332                         if ( !is_array( $root ) ) {
1333                                 $root = array( $root );
1334                         }
1335                         foreach ( $root as $node ) {
1336                                 if ( $first ) {
1337                                         $first = false;
1338                                 } else {
1339                                         $s .= $sep;
1340                                 }
1341                                 $s .= $this->expand( $node );
1342                         }
1343                 }
1344                 return $s;
1345         }
1346
1347         /**
1348          * Makes an object that, when expand()ed, will be the same as one obtained
1349          * with implode()
1350          *
1351          * @param $sep
1352          * @return PPNode_HipHop_Array
1353          */
1354         function virtualImplode( $sep /*, ... */ ) {
1355                 $args = array_slice( func_get_args(), 1 );
1356                 $out = array();
1357                 $first = true;
1358
1359                 foreach ( $args as $root ) {
1360                         if ( $root instanceof PPNode_HipHop_Array ) {
1361                                 $root = $root->value;
1362                         }
1363                         if ( !is_array( $root ) ) {
1364                                 $root = array( $root );
1365                         }
1366                         foreach ( $root as $node ) {
1367                                 if ( $first ) {
1368                                         $first = false;
1369                                 } else {
1370                                         $out[] = $sep;
1371                                 }
1372                                 $out[] = $node;
1373                         }
1374                 }
1375                 return new PPNode_HipHop_Array( $out );
1376         }
1377
1378         /**
1379          * Virtual implode with brackets
1380          *
1381          * @param $start
1382          * @param $sep
1383          * @param $end
1384          * @return PPNode_HipHop_Array
1385          */
1386         function virtualBracketedImplode( $start, $sep, $end /*, ... */ ) {
1387                 $args = array_slice( func_get_args(), 3 );
1388                 $out = array( $start );
1389                 $first = true;
1390
1391                 foreach ( $args as $root ) {
1392                         if ( $root instanceof PPNode_HipHop_Array ) {
1393                                 $root = $root->value;
1394                         }
1395                         if ( !is_array( $root ) ) {
1396                                 $root = array( $root );
1397                         }
1398                         foreach ( $root as $node ) {
1399                                 if ( $first ) {
1400                                         $first = false;
1401                                 } else {
1402                                         $out[] = $sep;
1403                                 }
1404                                 $out[] = $node;
1405                         }
1406                 }
1407                 $out[] = $end;
1408                 return new PPNode_HipHop_Array( $out );
1409         }
1410
1411         function __toString() {
1412                 return 'frame{}';
1413         }
1414
1415         /**
1416          * @param $level bool
1417          * @return array|bool|String
1418          */
1419         function getPDBK( $level = false ) {
1420                 if ( $level === false ) {
1421                         return $this->title->getPrefixedDBkey();
1422                 } else {
1423                         return isset( $this->titleCache[$level] ) ? $this->titleCache[$level] : false;
1424                 }
1425         }
1426
1427         /**
1428          * @return array
1429          */
1430         function getArguments() {
1431                 return array();
1432         }
1433
1434         /**
1435          * @return array
1436          */
1437         function getNumberedArguments() {
1438                 return array();
1439         }
1440
1441         /**
1442          * @return array
1443          */
1444         function getNamedArguments() {
1445                 return array();
1446         }
1447
1448         /**
1449          * Returns true if there are no arguments in this frame
1450          *
1451          * @return bool
1452          */
1453         function isEmpty() {
1454                 return true;
1455         }
1456
1457         /**
1458          * @param $name
1459          * @return bool
1460          */
1461         function getArgument( $name ) {
1462                 return false;
1463         }
1464
1465         /**
1466          * Returns true if the infinite loop check is OK, false if a loop is detected
1467          *
1468          * @param $title Title
1469          *
1470          * @return bool
1471          */
1472         function loopCheck( $title ) {
1473                 return !isset( $this->loopCheckHash[$title->getPrefixedDBkey()] );
1474         }
1475
1476         /**
1477          * Return true if the frame is a template frame
1478          *
1479          * @return bool
1480          */
1481         function isTemplate() {
1482                 return false;
1483         }
1484
1485         /**
1486          * Get a title of frame
1487          *
1488          * @return Title
1489          */
1490         function getTitle() {
1491                 return $this->title;
1492         }
1493 }
1494
1495 /**
1496  * Expansion frame with template arguments
1497  * @ingroup Parser
1498  */
1499 class PPTemplateFrame_HipHop extends PPFrame_HipHop {
1500         var $numberedArgs, $namedArgs, $parent;
1501         var $numberedExpansionCache, $namedExpansionCache;
1502
1503         /**
1504          * @param $preprocessor Preprocessor_HipHop
1505          * @param $parent bool
1506          * @param $numberedArgs array
1507          * @param $namedArgs array
1508          * @param $title Title|bool
1509          */
1510         function __construct( $preprocessor, $parent = false, $numberedArgs = array(), $namedArgs = array(), $title = false ) {
1511                 parent::__construct( $preprocessor );
1512
1513                 $this->parent = $parent;
1514                 $this->numberedArgs = $numberedArgs;
1515                 $this->namedArgs = $namedArgs;
1516                 $this->title = $title;
1517                 $pdbk = $title ? $title->getPrefixedDBkey() : false;
1518                 $this->titleCache = $parent->titleCache;
1519                 $this->titleCache[] = $pdbk;
1520                 $this->loopCheckHash = /*clone*/ $parent->loopCheckHash;
1521                 if ( $pdbk !== false ) {
1522                         $this->loopCheckHash[$pdbk] = true;
1523                 }
1524                 $this->depth = $parent->depth + 1;
1525                 $this->numberedExpansionCache = $this->namedExpansionCache = array();
1526         }
1527
1528         function __toString() {
1529                 $s = 'tplframe{';
1530                 $first = true;
1531                 $args = $this->numberedArgs + $this->namedArgs;
1532                 foreach ( $args as $name => $value ) {
1533                         if ( $first ) {
1534                                 $first = false;
1535                         } else {
1536                                 $s .= ', ';
1537                         }
1538                         $s .= "\"$name\":\"" .
1539                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1540                 }
1541                 $s .= '}';
1542                 return $s;
1543         }
1544         /**
1545          * Returns true if there are no arguments in this frame
1546          *
1547          * @return bool
1548          */
1549         function isEmpty() {
1550                 return !count( $this->numberedArgs ) && !count( $this->namedArgs );
1551         }
1552
1553         /**
1554          * @return array
1555          */
1556         function getArguments() {
1557                 $arguments = array();
1558                 foreach ( array_merge(
1559                                 array_keys($this->numberedArgs),
1560                                 array_keys($this->namedArgs)) as $key ) {
1561                         $arguments[$key] = $this->getArgument($key);
1562                 }
1563                 return $arguments;
1564         }
1565
1566         /**
1567          * @return array
1568          */
1569         function getNumberedArguments() {
1570                 $arguments = array();
1571                 foreach ( array_keys($this->numberedArgs) as $key ) {
1572                         $arguments[$key] = $this->getArgument($key);
1573                 }
1574                 return $arguments;
1575         }
1576
1577         /**
1578          * @return array
1579          */
1580         function getNamedArguments() {
1581                 $arguments = array();
1582                 foreach ( array_keys($this->namedArgs) as $key ) {
1583                         $arguments[$key] = $this->getArgument($key);
1584                 }
1585                 return $arguments;
1586         }
1587
1588         /**
1589          * @param $index
1590          * @return array|bool
1591          */
1592         function getNumberedArgument( $index ) {
1593                 if ( !isset( $this->numberedArgs[$index] ) ) {
1594                         return false;
1595                 }
1596                 if ( !isset( $this->numberedExpansionCache[$index] ) ) {
1597                         # No trimming for unnamed arguments
1598                         $this->numberedExpansionCache[$index] = $this->parent->expand( $this->numberedArgs[$index], PPFrame::STRIP_COMMENTS );
1599                 }
1600                 return $this->numberedExpansionCache[$index];
1601         }
1602
1603         /**
1604          * @param $name
1605          * @return bool
1606          */
1607         function getNamedArgument( $name ) {
1608                 if ( !isset( $this->namedArgs[$name] ) ) {
1609                         return false;
1610                 }
1611                 if ( !isset( $this->namedExpansionCache[$name] ) ) {
1612                         # Trim named arguments post-expand, for backwards compatibility
1613                         $this->namedExpansionCache[$name] = trim(
1614                                 $this->parent->expand( $this->namedArgs[$name], PPFrame::STRIP_COMMENTS ) );
1615                 }
1616                 return $this->namedExpansionCache[$name];
1617         }
1618
1619         /**
1620          * @param $name
1621          * @return array|bool
1622          */
1623         function getArgument( $name ) {
1624                 $text = $this->getNumberedArgument( $name );
1625                 if ( $text === false ) {
1626                         $text = $this->getNamedArgument( $name );
1627                 }
1628                 return $text;
1629         }
1630
1631         /**
1632          * Return true if the frame is a template frame
1633          *
1634          * @return bool
1635          */
1636         function isTemplate() {
1637                 return true;
1638         }
1639 }
1640
1641 /**
1642  * Expansion frame with custom arguments
1643  * @ingroup Parser
1644  */
1645 class PPCustomFrame_HipHop extends PPFrame_HipHop {
1646         var $args;
1647
1648         function __construct( $preprocessor, $args ) {
1649                 parent::__construct( $preprocessor );
1650                 $this->args = $args;
1651         }
1652
1653         function __toString() {
1654                 $s = 'cstmframe{';
1655                 $first = true;
1656                 foreach ( $this->args as $name => $value ) {
1657                         if ( $first ) {
1658                                 $first = false;
1659                         } else {
1660                                 $s .= ', ';
1661                         }
1662                         $s .= "\"$name\":\"" .
1663                                 str_replace( '"', '\\"', $value->__toString() ) . '"';
1664                 }
1665                 $s .= '}';
1666                 return $s;
1667         }
1668
1669         /**
1670          * @return bool
1671          */
1672         function isEmpty() {
1673                 return !count( $this->args );
1674         }
1675
1676         /**
1677          * @param $index
1678          * @return bool
1679          */
1680         function getArgument( $index ) {
1681                 if ( !isset( $this->args[$index] ) ) {
1682                         return false;
1683                 }
1684                 return $this->args[$index];
1685         }
1686 }
1687
1688 /**
1689  * @ingroup Parser
1690  */
1691 class PPNode_HipHop_Tree implements PPNode {
1692         var $name, $firstChild, $lastChild, $nextSibling;
1693
1694         function __construct( $name ) {
1695                 $this->name = $name;
1696                 $this->firstChild = $this->lastChild = $this->nextSibling = false;
1697         }
1698
1699         function __toString() {
1700                 $inner = '';
1701                 $attribs = '';
1702                 for ( $node = $this->firstChild; $node; $node = $node->nextSibling ) {
1703                         if ( $node instanceof PPNode_HipHop_Attr ) {
1704                                 $attribs .= ' ' . $node->name . '="' . htmlspecialchars( $node->value ) . '"';
1705                         } else {
1706                                 $inner .= $node->__toString();
1707                         }
1708                 }
1709                 if ( $inner === '' ) {
1710                         return "<{$this->name}$attribs/>";
1711                 } else {
1712                         return "<{$this->name}$attribs>$inner</{$this->name}>";
1713                 }
1714         }
1715
1716         /**
1717          * @param $name
1718          * @param $text
1719          * @return PPNode_HipHop_Tree
1720          */
1721         static function newWithText( $name, $text ) {
1722                 $obj = new self( $name );
1723                 $obj->addChild( new PPNode_HipHop_Text( $text ) );
1724                 return $obj;
1725         }
1726
1727         function addChild( $node ) {
1728                 if ( $this->lastChild === false ) {
1729                         $this->firstChild = $this->lastChild = $node;
1730                 } else {
1731                         $this->lastChild->nextSibling = $node;
1732                         $this->lastChild = $node;
1733                 }
1734         }
1735
1736         /**
1737          * @return PPNode_HipHop_Array
1738          */
1739         function getChildren() {
1740                 $children = array();
1741                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1742                         $children[] = $child;
1743                 }
1744                 return new PPNode_HipHop_Array( $children );
1745         }
1746
1747         function getFirstChild() {
1748                 return $this->firstChild;
1749         }
1750
1751         function getNextSibling() {
1752                 return $this->nextSibling;
1753         }
1754
1755         /**
1756          * @param $name string
1757          * @return array
1758          */
1759         function getChildrenOfType( $name ) {
1760                 $children = array();
1761                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1762                         if ( isset( $child->name ) && $child->name === $name ) {
1763                                 $children[] = $child;
1764                         }
1765                 }
1766                 return $children;
1767         }
1768
1769         /**
1770          * @return bool
1771          */
1772         function getLength() {
1773                 return false;
1774         }
1775
1776         /**
1777          * @param  $i
1778          * @return bool
1779          */
1780         function item( $i ) {
1781                 return false;
1782         }
1783
1784         /**
1785          * @return string
1786          */
1787         function getName() {
1788                 return $this->name;
1789         }
1790
1791         /**
1792          * Split a <part> node into an associative array containing:
1793          *    name          PPNode name
1794          *    index         String index
1795          *    value         PPNode value
1796          *
1797          * @throws MWException
1798          * @return array
1799          */
1800         function splitArg() {
1801                 $bits = array();
1802                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1803                         if ( !isset( $child->name ) ) {
1804                                 continue;
1805                         }
1806                         if ( $child->name === 'name' ) {
1807                                 $bits['name'] = $child;
1808                                 if ( $child->firstChild instanceof PPNode_HipHop_Attr
1809                                         && $child->firstChild->name === 'index' )
1810                                 {
1811                                         $bits['index'] = $child->firstChild->value;
1812                                 }
1813                         } elseif ( $child->name === 'value' ) {
1814                                 $bits['value'] = $child;
1815                         }
1816                 }
1817
1818                 if ( !isset( $bits['name'] ) ) {
1819                         throw new MWException( 'Invalid brace node passed to ' . __METHOD__ );
1820                 }
1821                 if ( !isset( $bits['index'] ) ) {
1822                         $bits['index'] = '';
1823                 }
1824                 return $bits;
1825         }
1826
1827         /**
1828          * Split an <ext> node into an associative array containing name, attr, inner and close
1829          * All values in the resulting array are PPNodes. Inner and close are optional.
1830          *
1831          * @throws MWException
1832          * @return array
1833          */
1834         function splitExt() {
1835                 $bits = array();
1836                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1837                         if ( !isset( $child->name ) ) {
1838                                 continue;
1839                         }
1840                         if ( $child->name === 'name' ) {
1841                                 $bits['name'] = $child;
1842                         } elseif ( $child->name === 'attr' ) {
1843                                 $bits['attr'] = $child;
1844                         } elseif ( $child->name === 'inner' ) {
1845                                 $bits['inner'] = $child;
1846                         } elseif ( $child->name === 'close' ) {
1847                                 $bits['close'] = $child;
1848                         }
1849                 }
1850                 if ( !isset( $bits['name'] ) ) {
1851                         throw new MWException( 'Invalid ext node passed to ' . __METHOD__ );
1852                 }
1853                 return $bits;
1854         }
1855
1856         /**
1857          * Split an <h> node
1858          *
1859          * @throws MWException
1860          * @return array
1861          */
1862         function splitHeading() {
1863                 if ( $this->name !== 'h' ) {
1864                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1865                 }
1866                 $bits = array();
1867                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1868                         if ( !isset( $child->name ) ) {
1869                                 continue;
1870                         }
1871                         if ( $child->name === 'i' ) {
1872                                 $bits['i'] = $child->value;
1873                         } elseif ( $child->name === 'level' ) {
1874                                 $bits['level'] = $child->value;
1875                         }
1876                 }
1877                 if ( !isset( $bits['i'] ) ) {
1878                         throw new MWException( 'Invalid h node passed to ' . __METHOD__ );
1879                 }
1880                 return $bits;
1881         }
1882
1883         /**
1884          * Split a <template> or <tplarg> node
1885          *
1886          * @return array
1887          */
1888         function splitTemplate() {
1889                 $parts = array();
1890                 $bits = array( 'lineStart' => '' );
1891                 for ( $child = $this->firstChild; $child; $child = $child->nextSibling ) {
1892                         if ( !isset( $child->name ) ) {
1893                                 continue;
1894                         }
1895                         if ( $child->name === 'title' ) {
1896                                 $bits['title'] = $child;
1897                         }
1898                         if ( $child->name === 'part' ) {
1899                                 $parts[] = $child;
1900                         }
1901                         if ( $child->name === 'lineStart' ) {
1902                                 $bits['lineStart'] = '1';
1903                         }
1904                 }
1905                 if ( !isset( $bits['title'] ) ) {
1906                         throw new MWException( 'Invalid node passed to ' . __METHOD__ );
1907                 }
1908                 $bits['parts'] = new PPNode_HipHop_Array( $parts );
1909                 return $bits;
1910         }
1911 }
1912
1913 /**
1914  * @ingroup Parser
1915  */
1916 class PPNode_HipHop_Text implements PPNode {
1917         var $value, $nextSibling;
1918
1919         function __construct( $value ) {
1920                 if ( is_object( $value ) ) {
1921                         throw new MWException( __CLASS__ . ' given object instead of string' );
1922                 }
1923                 $this->value = $value;
1924         }
1925
1926         function __toString() {
1927                 return htmlspecialchars( $this->value );
1928         }
1929
1930         function getNextSibling() {
1931                 return $this->nextSibling;
1932         }
1933
1934         function getChildren() { return false; }
1935         function getFirstChild() { return false; }
1936         function getChildrenOfType( $name ) { return false; }
1937         function getLength() { return false; }
1938         function item( $i ) { return false; }
1939         function getName() { return '#text'; }
1940         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1941         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1942         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1943 }
1944
1945 /**
1946  * @ingroup Parser
1947  */
1948 class PPNode_HipHop_Array implements PPNode {
1949         var $value, $nextSibling;
1950
1951         function __construct( $value ) {
1952                 $this->value = $value;
1953         }
1954
1955         function __toString() {
1956                 return var_export( $this, true );
1957         }
1958
1959         function getLength() {
1960                 return count( $this->value );
1961         }
1962
1963         function item( $i ) {
1964                 return $this->value[$i];
1965         }
1966
1967         function getName() { return '#nodelist'; }
1968
1969         function getNextSibling() {
1970                 return $this->nextSibling;
1971         }
1972
1973         function getChildren() { return false; }
1974         function getFirstChild() { return false; }
1975         function getChildrenOfType( $name ) { return false; }
1976         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
1977         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
1978         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
1979 }
1980
1981 /**
1982  * @ingroup Parser
1983  */
1984 class PPNode_HipHop_Attr implements PPNode {
1985         var $name, $value, $nextSibling;
1986
1987         function __construct( $name, $value ) {
1988                 $this->name = $name;
1989                 $this->value = $value;
1990         }
1991
1992         function __toString() {
1993                 return "<@{$this->name}>" . htmlspecialchars( $this->value ) . "</@{$this->name}>";
1994         }
1995
1996         function getName() {
1997                 return $this->name;
1998         }
1999
2000         function getNextSibling() {
2001                 return $this->nextSibling;
2002         }
2003
2004         function getChildren() { return false; }
2005         function getFirstChild() { return false; }
2006         function getChildrenOfType( $name ) { return false; }
2007         function getLength() { return false; }
2008         function item( $i ) { return false; }
2009         function splitArg() { throw new MWException( __METHOD__ . ': not supported' ); }
2010         function splitExt() { throw new MWException( __METHOD__ . ': not supported' ); }
2011         function splitHeading() { throw new MWException( __METHOD__ . ': not supported' ); }
2012 }