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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\MathSearch\StackExchange; |
| 4 | |
| 5 | use ArrayIterator; |
| 6 | use XMLReader; |
| 7 | |
| 8 | class WikitextGenerator { |
| 9 | |
| 10 | /** @var IdMap */ |
| 11 | private $idGen; |
| 12 | /** @var Formula[] */ |
| 13 | private $formulae = []; |
| 14 | |
| 15 | /** |
| 16 | * @param IdMap|null $idGen |
| 17 | */ |
| 18 | public function __construct( IdMap $idGen = null ) { |
| 19 | if ( $idGen === null ) { |
| 20 | $idGen = IdMap::getInstance(); |
| 21 | } |
| 22 | $this->idGen = $idGen; |
| 23 | } |
| 24 | |
| 25 | public function getNextElement( XMLReader $xml, $postQId ): string { |
| 26 | if ( $xml->nodeType == XMLReader::ELEMENT ) { |
| 27 | if ( $xml->name === 'a' ) { |
| 28 | $href = $xml->getAttribute( 'href' ); |
| 29 | if ( $href ) { |
| 30 | $xml->read(); |
| 31 | if ( preg_match( '#http://en\.wikipedia\.org/wiki/(.*)#', $href, $matches ) ) { |
| 32 | return "[[w:{$matches[1]}|$xml->value]]"; |
| 33 | } else { |
| 34 | return "[$href $xml->value]"; |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | if ( $xml->name === 'span' && $xml->getAttribute( 'class' ) === 'math-container' ) { |
| 39 | $fid = (int)$xml->getAttribute( 'id' ); |
| 40 | $qid = $this->getQId( $fid ); |
| 41 | $xml->read(); |
| 42 | $tagText = $xml->value; |
| 43 | $this->formulae[] = new Formula( $fid, $qid, $tagText, $postQId ); |
| 44 | return "<math id='$fid' qid='$qid'>$tagText</math>"; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | return $xml->value; |
| 49 | } |
| 50 | |
| 51 | public function toWikitext( $html, $postQId = null ) { |
| 52 | $xml = new XMLReader(); |
| 53 | $xml->XML( "<text>$html</text>" ); |
| 54 | $out = ""; |
| 55 | while ( $xml->read() ) { |
| 56 | $out .= $this->getNextElement( $xml, $postQId ); |
| 57 | } |
| 58 | return $out; |
| 59 | } |
| 60 | |
| 61 | private function getQId( int $fid ) { |
| 62 | return $this->idGen->addQid( $fid, 0 ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * @return ArrayIterator|Formula[] |
| 67 | */ |
| 68 | public function getFormulae() { |
| 69 | return new ArrayIterator( $this->formulae ); |
| 70 | } |
| 71 | |
| 72 | } |