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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\Purtle; |
| 4 | |
| 5 | /** |
| 6 | * @license GPL-2.0-or-later |
| 7 | * @author Daniel Kinzler |
| 8 | */ |
| 9 | class NTriplesRdfWriter extends N3RdfWriterBase { |
| 10 | |
| 11 | /** |
| 12 | * @param string $role |
| 13 | * @param BNodeLabeler|null $labeler |
| 14 | * @param N3Quoter|null $quoter |
| 15 | */ |
| 16 | public function __construct( |
| 17 | $role = parent::DOCUMENT_ROLE, |
| 18 | BNodeLabeler $labeler = null, |
| 19 | N3Quoter $quoter = null |
| 20 | ) { |
| 21 | parent::__construct( $role, $labeler, $quoter ); |
| 22 | |
| 23 | // NOTE: The RDF 1.1 spec of N-Triples allows full UTF-8, so escaping would not be required. |
| 24 | // However, as of 2015, many consumers of N-Triples still expect non-ASCII characters |
| 25 | // to be escaped. |
| 26 | // NOTE: if this is changed, getMimeType must be changed accordingly. |
| 27 | $this->quoter->setEscapeUnicode( true ); |
| 28 | |
| 29 | $this->transitionTable[self::STATE_OBJECT] = [ |
| 30 | self::STATE_DOCUMENT => " .\n", |
| 31 | self::STATE_SUBJECT => " .\n", |
| 32 | self::STATE_PREDICATE => " .\n", |
| 33 | self::STATE_OBJECT => " .\n", |
| 34 | ]; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * @inheritDoc |
| 39 | */ |
| 40 | protected function expandSubject( &$base, &$local ) { |
| 41 | $this->expandQName( $base, $local ); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * @inheritDoc |
| 46 | */ |
| 47 | protected function writeSubject( $base, $local = null ) { |
| 48 | // noop |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * @inheritDoc |
| 53 | */ |
| 54 | protected function expandPredicate( &$base, &$local ) { |
| 55 | $this->expandShorthand( $base, $local ); // e.g. ( 'a', null ) => ( 'rdf', 'type' ) |
| 56 | $this->expandQName( $base, $local ); // e.g. ( 'acme', 'foo' ) => ( 'http://acme.test/foo', null ) |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * @inheritDoc |
| 61 | */ |
| 62 | protected function writePredicate( $base, $local = null ) { |
| 63 | // noop |
| 64 | } |
| 65 | |
| 66 | private function writeSubjectAndObject() { |
| 67 | $this->writeRef( $this->currentSubject[0], $this->currentSubject[1] ); |
| 68 | $this->write( ' ' ); |
| 69 | $this->writeRef( $this->currentPredicate[0], $this->currentPredicate[1] ); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * @inheritDoc |
| 74 | */ |
| 75 | protected function expandResource( &$base, &$local ) { |
| 76 | $this->expandQName( $base, $local ); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * @inheritDoc |
| 81 | */ |
| 82 | protected function expandType( &$base, &$local ) { |
| 83 | $this->expandQName( $base, $local ); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * @inheritDoc |
| 88 | */ |
| 89 | protected function writeResource( $base, $local = null ) { |
| 90 | $this->writeSubjectAndObject(); |
| 91 | $this->write( ' ' ); |
| 92 | $this->writeRef( $base, $local ); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * @inheritDoc |
| 97 | */ |
| 98 | protected function writeText( $text, $language = null ) { |
| 99 | $this->writeSubjectAndObject(); |
| 100 | $this->write( ' ' ); |
| 101 | |
| 102 | parent::writeText( $text, $language ); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * @param string $value |
| 107 | * @param string|null $typeBase |
| 108 | * @param string|null $typeLocal |
| 109 | */ |
| 110 | protected function writeValue( $value, $typeBase, $typeLocal = null ) { |
| 111 | $this->writeSubjectAndObject(); |
| 112 | $this->write( ' ' ); |
| 113 | |
| 114 | parent::writeValue( $value, $typeBase, $typeLocal ); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * @param string $role |
| 119 | * @param BNodeLabeler $labeler |
| 120 | * |
| 121 | * @return RdfWriterBase |
| 122 | */ |
| 123 | protected function newSubWriter( $role, BNodeLabeler $labeler ) { |
| 124 | $writer = new self( $role, $labeler, $this->quoter ); |
| 125 | |
| 126 | return $writer; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * @return string a MIME type |
| 131 | */ |
| 132 | public function getMimeType() { |
| 133 | // NOTE: Add charset=UTF-8 if and when the constructor configures $this->quoter |
| 134 | // to write utf-8. |
| 135 | return 'application/n-triples'; |
| 136 | } |
| 137 | |
| 138 | } |