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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Parsoid; |
| 4 | |
| 5 | use DOMXPath; |
| 6 | use Flow\Conversion\Utils; |
| 7 | use Flow\Exception\InvalidReferenceException; |
| 8 | use Flow\Model\Reference; |
| 9 | use Flow\Model\UUID; |
| 10 | use Flow\Model\Workflow; |
| 11 | use LogicException; |
| 12 | use RuntimeException; |
| 13 | |
| 14 | /** |
| 15 | * Extracts references to templates, files and pages (in the form of links) |
| 16 | * from Parsoid HTML. |
| 17 | */ |
| 18 | class ReferenceExtractor { |
| 19 | /** |
| 20 | * @var Extractor[][] Map from revision type (AbstractRevision::getRevisionType()) |
| 21 | * to list of Extractor objects to use. |
| 22 | */ |
| 23 | protected $extractors; |
| 24 | |
| 25 | /** |
| 26 | * @param Extractor[][] $extractors Map from revision type (AbstractRevision::getRevisionType()) |
| 27 | * to a list of extractors to use. |
| 28 | */ |
| 29 | public function __construct( array $extractors ) { |
| 30 | $this->extractors = $extractors; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * @param Workflow $workflow |
| 35 | * @param string $objectType |
| 36 | * @param UUID $objectId |
| 37 | * @param string $text |
| 38 | * @return array |
| 39 | */ |
| 40 | public function getReferences( Workflow $workflow, $objectType, UUID $objectId, $text ) { |
| 41 | if ( isset( $this->extractors[$objectType] ) ) { |
| 42 | return $this->extractReferences( |
| 43 | new ReferenceFactory( $workflow, $objectType, $objectId ), |
| 44 | $this->extractors[$objectType], |
| 45 | $text |
| 46 | ); |
| 47 | } else { |
| 48 | throw new LogicException( "No extractors available for $objectType" ); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * @param ReferenceFactory $factory |
| 54 | * @param Extractor[] $extractors |
| 55 | * @param string $text |
| 56 | * @return Reference[] |
| 57 | */ |
| 58 | protected function extractReferences( ReferenceFactory $factory, array $extractors, $text ) { |
| 59 | $dom = Utils::createDOM( $text ); |
| 60 | |
| 61 | $output = []; |
| 62 | |
| 63 | $xpath = new DOMXPath( $dom ); |
| 64 | |
| 65 | foreach ( $extractors as $extractor ) { |
| 66 | $elements = $xpath->query( $extractor->getXPath() ); |
| 67 | |
| 68 | if ( !$elements ) { |
| 69 | $class = get_class( $extractor ); |
| 70 | throw new RuntimeException( "Malformed xpath from $class: " . $extractor->getXPath() ); |
| 71 | } |
| 72 | |
| 73 | foreach ( $elements as $element ) { |
| 74 | try { |
| 75 | $ref = $extractor->perform( $factory, $element ); |
| 76 | } catch ( InvalidReferenceException $e ) { |
| 77 | wfDebugLog( 'Flow', 'Invalid reference detected, skipping element' ); |
| 78 | $ref = null; |
| 79 | } |
| 80 | // no reference was generated |
| 81 | if ( $ref === null ) { |
| 82 | continue; |
| 83 | } |
| 84 | // reference points to a special page |
| 85 | if ( $ref->getSrcTitle()->isSpecialPage() ) { |
| 86 | continue; |
| 87 | } |
| 88 | |
| 89 | $output[] = $ref; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | return $output; |
| 94 | } |
| 95 | } |