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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\Purtle; |
| 4 | |
| 5 | /** |
| 6 | * RdfWriter implementation for generating Turtle output. |
| 7 | * |
| 8 | * @license GPL-2.0-or-later |
| 9 | * @author Daniel Kinzler |
| 10 | */ |
| 11 | class TurtleRdfWriter extends N3RdfWriterBase { |
| 12 | |
| 13 | /** |
| 14 | * @var bool |
| 15 | */ |
| 16 | private $trustIRIs = true; |
| 17 | |
| 18 | /** |
| 19 | * @return bool |
| 20 | */ |
| 21 | public function getTrustIRIs() { |
| 22 | return $this->trustIRIs; |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * @param bool $trustIRIs |
| 27 | */ |
| 28 | public function setTrustIRIs( $trustIRIs ) { |
| 29 | $this->trustIRIs = $trustIRIs; |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * @param string $role |
| 34 | * @param BNodeLabeler|null $labeler |
| 35 | * @param N3Quoter|null $quoter |
| 36 | */ |
| 37 | public function __construct( |
| 38 | $role = parent::DOCUMENT_ROLE, |
| 39 | ?BNodeLabeler $labeler = null, |
| 40 | ?N3Quoter $quoter = null |
| 41 | ) { |
| 42 | parent::__construct( $role, $labeler, $quoter ); |
| 43 | $this->transitionTable[self::STATE_OBJECT] = [ |
| 44 | self::STATE_DOCUMENT => " .\n", |
| 45 | self::STATE_SUBJECT => " .\n\n", |
| 46 | self::STATE_PREDICATE => " ;\n\t", |
| 47 | self::STATE_OBJECT => ",\n\t\t", |
| 48 | ]; |
| 49 | $this->transitionTable[self::STATE_DOCUMENT][self::STATE_SUBJECT] = "\n"; |
| 50 | $this->transitionTable[self::STATE_SUBJECT][self::STATE_PREDICATE] = ' '; |
| 51 | $this->transitionTable[self::STATE_PREDICATE][self::STATE_OBJECT] = ' '; |
| 52 | $this->transitionTable[self::STATE_START][self::STATE_DOCUMENT] = function () { |
| 53 | $this->beginDocument(); |
| 54 | }; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Write prefixes |
| 59 | */ |
| 60 | private function beginDocument() { |
| 61 | foreach ( $this->getPrefixes() as $prefix => $uri ) { |
| 62 | $this->write( "@prefix $prefix: <" . $this->quoter->escapeIRI( $uri ) . "> .\n" ); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @inheritDoc |
| 68 | */ |
| 69 | protected function writeSubject( $base, $local = null ) { |
| 70 | if ( $local !== null ) { |
| 71 | $this->write( "$base:$local" ); |
| 72 | } else { |
| 73 | $this->writeIRI( $base, $this->trustIRIs ); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * @inheritDoc |
| 79 | */ |
| 80 | protected function writePredicate( $base, $local = null ) { |
| 81 | if ( $base === 'a' ) { |
| 82 | $this->write( 'a' ); |
| 83 | return; |
| 84 | } |
| 85 | if ( $local !== null ) { |
| 86 | $this->write( "$base:$local" ); |
| 87 | } else { |
| 88 | $this->writeIRI( $base, $this->trustIRIs ); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @inheritDoc |
| 94 | */ |
| 95 | protected function writeResource( $base, $local = null ) { |
| 96 | if ( $local !== null ) { |
| 97 | $this->write( "$base:$local" ); |
| 98 | } else { |
| 99 | $this->writeIRI( $base ); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * @param string $role |
| 105 | * @param BNodeLabeler $labeler |
| 106 | * |
| 107 | * @return RdfWriterBase |
| 108 | */ |
| 109 | protected function newSubWriter( $role, BNodeLabeler $labeler ) { |
| 110 | $writer = new self( $role, $labeler, $this->quoter ); |
| 111 | |
| 112 | return $writer; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * @return string a MIME type |
| 117 | */ |
| 118 | public function getMimeType() { |
| 119 | return 'text/turtle; charset=UTF-8'; |
| 120 | } |
| 121 | |
| 122 | } |