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<?php declare( strict_types = 1 ); namespace Wikimedia\Parsoid\Wt2Html\TT; use Wikimedia\Parsoid\NodeData\DataParsoid; use Wikimedia\Parsoid\Tokens\EndTagTk; use Wikimedia\Parsoid\Tokens\EOFTk; use Wikimedia\Parsoid\Tokens\NlTk; use Wikimedia\Parsoid\Tokens\SourceRange; use Wikimedia\Parsoid\Tokens\TagTk; use Wikimedia\Parsoid\Tokens\Token; use Wikimedia\Parsoid\Utils\PHPUtils; use Wikimedia\Parsoid\Utils\TokenUtils; use Wikimedia\Parsoid\Wt2Html\TokenTransformManager; /** * Create list tag around list items and map wiki bullet levels to html. / class ListHandler extends TokenHandler { /* @var array<ListFrame> / private $listFrames; /* @var ?ListFrame / private $currListFrame; /* @var int / private $nestedTableCount; /* * Debug string output of bullet character mappings. * @var array<string,array<string,string>> / private static $bullet_chars_map = [ '' => [ 'list' => 'ul', 'item' => 'li' ], '#' => [ 'list' => 'ol', 'item' => 'li' ], ';' => [ 'list' => 'dl', 'item' => 'dt' ], ':' => [ 'list' => 'dl', 'item' => 'dd' ] ]; /** * The HTML5 parsing spec says that when encountering a closing tag for a * certain set of open tags we should generate implied ends to list items, * https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inbody:generate-implied-end-tags-5 * * So, in order to roundtrip accurately, we should follow suit. However, * we choose an ostensible superset of those tags, our wikitext blocks, to * have this behaviour. Hopefully the differences aren't relevant. * * @param string $tagName * @return bool / private static function generateImpliedEndTags( string $tagName ): bool { return TokenUtils::isWikitextBlockTag( $tagName ); } /* * @param TokenTransformManager $manager manager environment * @param array $options options / public function __construct( TokenTransformManager $manager, array $options ) { parent::__construct( $manager, $options ); $this->listFrames = []; $this->reset(); } /* * Resets the list handler / private function reset(): void { $this->onAnyEnabled = false; $this->nestedTableCount = 0; $this->resetCurrListFrame(); } /* * Resets the current list frame / private function resetCurrListFrame(): void { $this->currListFrame = null; } /* * @inheritDoc / public function onTag( Token $token ): ?TokenHandlerResult { return $token->getName() === 'listItem' ? $this->onListItem( $token ) : null; } /* * @inheritDoc / public function onAny( $token ): ?TokenHandlerResult { $this->env->log( 'trace/list', $this->pipelineId, 'ANY:', static function () use ( $token ) { return PHPUtils::jsonEncode( $token ); } ); $tokens = null; if ( !$this->currListFrame ) { // this.currListFrame will be null only when we are in a table // that in turn was seen in a list context. // // Since we are not in a list within the table, nothing to do. // Just send the token back unchanged. if ( $token instanceof EndTagTk && $token->getName() === 'table' ) { if ( $this->nestedTableCount === 0 ) { $this->currListFrame = array_pop( $this->listFrames ); } else { $this->nestedTableCount--; } } elseif ( $token instanceof TagTk && $token->getName() === 'table' ) { $this->nestedTableCount++; } $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $token ); return null; } // Keep track of open tags per list frame in order to prevent colons // starting lists illegally. Php's findColonNoLinks. if ( $token instanceof TagTk // Table tokens will push the frame and remain balanced. // They're safe to ignore in the bookkeeping. && $token->getName() !== 'table' ) { $this->currListFrame->numOpenTags += 1; } elseif ( $token instanceof EndTagTk && $this->currListFrame->numOpenTags > 0 ) { $this->currListFrame->numOpenTags -= 1; } if ( $token instanceof EndTagTk ) { if ( $token->getName() === 'table' ) { // close all open lists and pop a frame $ret = $this->closeLists( $token ); $this->currListFrame = array_pop( $this->listFrames ); return new TokenHandlerResult( $ret ); } elseif ( self::generateImpliedEndTags( $token->getName() ) ) { if ( $this->currListFrame->numOpenBlockTags === 0 ) { // Unbalanced closing block tag in a list context ==> close all previous lists return new TokenHandlerResult( $this->closeLists( $token ) ); } else { $this->currListFrame->numOpenBlockTags--; if ( $this->currListFrame->atEOL ) { // Non-list item in newline context ==> close all previous lists return new TokenHandlerResult( $this->closeLists( $token ) ); } else { $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $token ); return null; } } } / Non-block tag -- fall-through to other tests below / } if ( $this->currListFrame->atEOL ) { if ( !$token instanceof NlTk && TokenUtils::isSolTransparent( $this->env, $token ) ) { // Hold on to see where the token stream goes from here // - another list item, or // - end of list if ( $this->currListFrame->nlTk ) { $this->currListFrame->solTokens[] = $this->currListFrame->nlTk; $this->currListFrame->nlTk = null; } $this->currListFrame->solTokens[] = $token; return new TokenHandlerResult( [] ); } else { // Non-list item in newline context ==> close all previous lists return new TokenHandlerResult( $this->closeLists( $token ) ); } } if ( $token instanceof NlTk ) { $this->currListFrame->atEOL = true; $this->currListFrame->nlTk = $token; // php's findColonNoLinks is run in doBlockLevels, which examines // the text line-by-line. At nltk, any open tags will cease having // an effect. $this->currListFrame->numOpenTags = 0; return new TokenHandlerResult( [] ); } if ( $token instanceof TagTk ) { if ( $token->getName() === 'table' ) { $this->listFrames[] = $this->currListFrame; $this->resetCurrListFrame(); } elseif ( self::generateImpliedEndTags( $token->getName() ) ) { $this->currListFrame->numOpenBlockTags++; } $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $token ); return null; } // Nothing else left to do $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $token ); return null; } /* * @inheritDoc / public function onEnd( EOFTk $token ): ?TokenHandlerResult { $this->env->log( 'trace/list', $this->pipelineId, 'END:', static function () use ( $token ) { return PHPUtils::jsonEncode( $token ); } ); $this->listFrames = []; if ( !$this->currListFrame ) { // init here so we dont have to have a check in closeLists // That way, if we get a null frame there, we know we have a bug. $this->currListFrame = new ListFrame; } $toks = $this->closeLists( $token ); $this->reset(); return new TokenHandlerResult( $toks ); } /* * Handle close list processing * * @param Token\|string $token * @return array / private function closeLists( $token ): array { // pop all open list item tokens $tokens = $this->popTags( count( $this->currListFrame->bstack ) ); // purge all stashed sol-tokens PHPUtils::pushArray( $tokens, $this->currListFrame->solTokens ); if ( $this->currListFrame->nlTk ) { $tokens[] = $this->currListFrame->nlTk; } $tokens[] = $token; // remove any transform if we dont have any stashed list frames if ( count( $this->listFrames ) === 0 ) { $this->onAnyEnabled = false; } $this->resetCurrListFrame(); $this->env->log( 'trace/list', $this->pipelineId, '----closing all lists----' ); $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $tokens ); return $tokens; } /* * Handle a list item * * @param Token $token * @return TokenHandlerResult\|null / private function onListItem( Token $token ): ?TokenHandlerResult { if ( $token instanceof TagTk ) { $this->onAnyEnabled = true; if ( $this->currListFrame ) { // Ignoring colons inside tags to prevent illegal overlapping. // Attempts to mimic findColonNoLinks in the php parser. $bullets = $token->getAttribute( 'bullets' ); if ( PHPUtils::lastItem( $bullets ) === ':' && $this->currListFrame->numOpenTags > 0 ) { $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', ':' ); return new TokenHandlerResult( [ ':' ] ); } } else { $this->currListFrame = new ListFrame; } // convert listItem to list and list item tokens $res = $this->doListItem( $this->currListFrame->bstack, $token->getAttribute( 'bullets' ), $token ); return new TokenHandlerResult( $res ); } $this->env->log( 'trace/list', $this->pipelineId, 'RET: ', $token ); return null; } /* * Determine the minimum common prefix length * * @param array $x * @param array $y * @return int / private function commonPrefixLength( array $x, array $y ): int { $minLength = min( count( $x ), count( $y ) ); $i = 0; for ( ; $i < $minLength; $i++ ) { if ( $x[$i] !== $y[$i] ) { break; } } return $i; } /* * Push a list * * @param array $container * @param DataParsoid $dp1 * @param DataParsoid $dp2 * @return array / private function pushList( array $container, DataParsoid $dp1, DataParsoid $dp2 ): array { $this->currListFrame->endtags[] = new EndTagTk( $container['list'] ); $this->currListFrame->endtags[] = new EndTagTk( $container['item'] ); return [ new TagTk( $container['list'], [], $dp1 ), new TagTk( $container['item'], [], $dp2 ) ]; } /* * Handle popping tags after processing * * @param int $n * @return array / private function popTags( int $n ): array { $tokens = []; while ( $n > 0 ) { // push list item.. $temp = array_pop( $this->currListFrame->endtags ); if ( !empty( $temp ) ) { $tokens[] = $temp; } // and the list end tag $temp = array_pop( $this->currListFrame->endtags ); if ( !empty( $temp ) ) { $tokens[] = $temp; } $n--; } return $tokens; } /* * Check for Dt Dd sequence * * @param string $a * @param string $b * @return bool / private function isDtDd( string $a, string $b ): bool { $ab = [ $a, $b ]; sort( $ab ); return ( $ab[0] === ':' && $ab[1] === ';' ); } /* * Handle do list item processing * * @param array $bs * @param array $bn * @param Token $token * @return array / private function doListItem( array $bs, array $bn, Token $token ): array { $this->env->log( 'trace/list', $this->pipelineId, 'BEGIN:', static function () use ( $token ) { return PHPUtils::jsonEncode( $token ); } ); $prefixLen = $this->commonPrefixLength( $bs, $bn ); $prefix = array_slice( $bn, 0, $prefixLen/CHECK THIS/ ); $dp = $token->dataAttribs; $makeDP = static function ( $k, $j ) use ( $dp ) { $newDP = $dp->clone(); $tsr = $dp->tsr ?? null; if ( $tsr ) { $newDP->tsr = new SourceRange( $tsr->start + $k, $tsr->start + $j ); } return $newDP; }; $this->currListFrame->bstack = $bn; $res = null; $itemToken = null; // emit close tag tokens for closed lists $this->env->log( 'trace/list', $this->pipelineId, static function () use ( $bs, $bn ) { return ' bs: ' . PHPUtils::jsonEncode( $bs ) . '; bn: ' . PHPUtils::jsonEncode( $bn ); } ); if ( count( $prefix ) === count( $bs ) && count( $bn ) === count( $bs ) ) { $this->env->log( 'trace/list', $this->pipelineId, ' -> no nesting change' ); // same list item types and same nesting level $itemToken = array_pop( $this->currListFrame->endtags ); $this->currListFrame->endtags[] = new EndTagTk( $itemToken->getName() ); $res = array_merge( [ $itemToken ], $this->currListFrame->solTokens, [ // this list item gets all the bullets since this is // a list item at the same level // // a // b $this->currListFrame->nlTk ?: '', new TagTk( $itemToken->getName(), [], $makeDP( 0, count( $bn ) ) ) ] ); } else { $prefixCorrection = 0; $tokens = []; if ( count( $bs ) > $prefixLen && count( $bn ) > $prefixLen && $this->isDtDd( $bs[$prefixLen], $bn[$prefixLen] ) ) { / ------------------------------------------------ * Handle dd/dt transitions * * Example: * * *;:: foo *::: bar * the 3rd bullet is the dt-dd transition * ------------------------------------------------ / $tokens = $this->popTags( count( $bs ) - $prefixLen - 1 ); $tokens = array_merge( $this->currListFrame->solTokens, $tokens ); $newName = self::$bullet_chars_map[$bn[$prefixLen]]['item']; $endTag = array_pop( $this->currListFrame->endtags ); $this->currListFrame->endtags[] = new EndTagTk( $newName ); $newTag = null; if ( isset( $dp->stx ) && $dp->stx === 'row' ) { // stx='row' is only set for single-line dt-dd lists (see tokenizer) // In this scenario, the dd token we are building a token for has no prefix // Ex: ;a:b, ;a:b, #*;a:b, etc. Compare with ;a\n:b, #;a\n#:b $this->env->log( 'trace/list', $this->pipelineId, ' -> single-line dt->dd transition' ); $newTag = new TagTk( $newName, [], $makeDP( 0, 1 ) ); } else { $this->env->log( 'trace/list', $this->pipelineId, ' -> other dt/dd transition' ); $newTag = new TagTk( $newName, [], $makeDP( 0, $prefixLen + 1 ) ); } $tokens[] = $endTag; $tokens[] = $this->currListFrame->nlTk ?: ''; $tokens[] = $newTag; $prefixCorrection = 1; } else { $this->env->log( 'trace/list', $this->pipelineId, ' -> reduced nesting' ); $tokens = array_merge( $this->currListFrame->solTokens, $tokens, $this->popTags( count( $bs ) - $prefixLen ) ); if ( $this->currListFrame->nlTk ) { $tokens[] = $this->currListFrame->nlTk; } if ( $prefixLen > 0 && count( $bn ) === $prefixLen ) { $itemToken = array_pop( $this->currListFrame->endtags ); $tokens[] = $itemToken; // this list item gets all bullets upto the shared prefix $tokens[] = new TagTk( $itemToken->getName(), [], $makeDP( 0, count( $bn ) ) ); $this->currListFrame->endtags[] = new EndTagTk( $itemToken->getName() ); } } for ( $i = $prefixLen + $prefixCorrection; $i < count( $bn ); $i++ ) { if ( !self::$bullet_chars_map[$bn[$i]] ) { throw new \Exception( 'Unknown node prefix ' . $prefix[$i] ); } // Each list item in the chain gets one bullet. // However, the first item also includes the shared prefix. // // Example: // // a // **b // // Yields: // // <ul><li-> // <ul><li->a // <ul><li-FIRST-ONE-gets-*> // <ul><li->b</li></ul> // </li></ul> // </li></ul> // </li></ul> // // Unless prefixCorrection is > 0, in which case we've // already accounted for the initial bullets. // // prefixCorrection is for handling dl-dts like this // // ;a:b // ;;c:d // // ";c:d" is embedded within a dt that is 1 char wide(;) $listDP = null; $listItemDP = null; if ( $i === $prefixLen ) { $this->env->log( 'trace/list', $this->pipelineId, ' -> increased nesting: first' ); $listDP = $makeDP( 0, 0 ); $listItemDP = $makeDP( 0, $i + 1 ); } else { $this->env->log( 'trace/list', $this->pipelineId, ' -> increased nesting: 2nd and higher' ); $listDP = $makeDP( $i, $i ); $listItemDP = $makeDP( $i, $i + 1 ); } PHPUtils::pushArray( $tokens, $this->pushList( self::$bullet_chars_map[$bn[$i]], $listDP, $listItemDP ) ); } $res = $tokens; } // clear out sol-tokens $this->currListFrame->solTokens = []; $this->currListFrame->nlTk = null; $this->currListFrame->atEOL = false; $this->env->log( 'trace/list', $this->pipelineId, 'RET:', static function () use ( $res ) { return PHPUtils::jsonEncode( $res ); } ); return $res; } }

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