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NTriplesRdfWriter.php
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NTriplesRdfWriter.php
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<?php
namespace Wikimedia\Purtle;
/**
* @license GPL-2.0-or-later
* @author Daniel Kinzler
*/
class NTriplesRdfWriter extends N3RdfWriterBase {
/**
* @param string $role
* @param BNodeLabeler|null $labeler
* @param N3Quoter|null $quoter
*/
public function __construct(
$role = parent::DOCUMENT_ROLE,
?BNodeLabeler $labeler = null,
?N3Quoter $quoter = null
) {
parent::__construct( $role, $labeler, $quoter );
// NOTE: The RDF 1.1 spec of N-Triples allows full UTF-8, so escaping would not be required.
// However, as of 2015, many consumers of N-Triples still expect non-ASCII characters
// to be escaped.
// NOTE: if this is changed, getMimeType must be changed accordingly.
$this->quoter->setEscapeUnicode( true );
$this->transitionTable[self::STATE_OBJECT] = [
self::STATE_DOCUMENT => " .\n",
self::STATE_SUBJECT => " .\n",
self::STATE_PREDICATE => " .\n",
self::STATE_OBJECT => " .\n",
];
}
/**
* @inheritDoc
*/
protected function expandSubject( &$base, &$local ) {
$this->expandQName( $base, $local );
}
/**
* @inheritDoc
*/
protected function writeSubject( $base, $local = null ) {
// noop
}
/**
* @inheritDoc
*/
protected function expandPredicate( &$base, &$local ) {
$this->expandShorthand( $base, $local ); // e.g. ( 'a', null ) => ( 'rdf', 'type' )
$this->expandQName( $base, $local ); // e.g. ( 'acme', 'foo' ) => ( 'http://acme.test/foo', null )
}
/**
* @inheritDoc
*/
protected function writePredicate( $base, $local = null ) {
// noop
}
private function writeSubjectAndObject() {
$this->writeRef( $this->currentSubject[0], $this->currentSubject[1] );
$this->write( ' ' );
$this->writeRef( $this->currentPredicate[0], $this->currentPredicate[1] );
}
/**
* @inheritDoc
*/
protected function expandResource( &$base, &$local ) {
$this->expandQName( $base, $local );
}
/**
* @inheritDoc
*/
protected function expandType( &$base, &$local ) {
$this->expandQName( $base, $local );
}
/**
* @inheritDoc
*/
protected function writeResource( $base, $local = null ) {
$this->writeSubjectAndObject();
$this->write( ' ' );
$this->writeRef( $base, $local );
}
/**
* @inheritDoc
*/
protected function writeText( $text, $language = null ) {
$this->writeSubjectAndObject();
$this->write( ' ' );
parent::writeText( $text, $language );
}
/**
* @param string $value
* @param string|null $typeBase
* @param string|null $typeLocal
*/
protected function writeValue( $value, $typeBase, $typeLocal = null ) {
$this->writeSubjectAndObject();
$this->write( ' ' );
parent::writeValue( $value, $typeBase, $typeLocal );
}
/**
* @param string $role
* @param BNodeLabeler $labeler
*
* @return RdfWriterBase
*/
protected function newSubWriter( $role, BNodeLabeler $labeler ) {
$writer = new self( $role, $labeler, $this->quoter );
return $writer;
}
/**
* @return string a MIME type
*/
public function getMimeType() {
// NOTE: Add charset=UTF-8 if and when the constructor configures $this->quoter
// to write utf-8.
return 'application/n-triples';
}
}

File Metadata

Mime Type
text/x-php
Expires
Oct 4 2026, 05:52 (5 w, 18 h ago)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
96/d4/8ee9cc06c839667772fcd6c45754
Default Alt Text
NTriplesRdfWriter.php (3 KB)

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