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TurtleRdfWriter.php
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TurtleRdfWriter.php
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<?php
namespace Wikimedia\Purtle;
/**
* RdfWriter implementation for generating Turtle output.
*
* @license GPL-2.0-or-later
* @author Daniel Kinzler
*/
class TurtleRdfWriter extends N3RdfWriterBase {
/**
* @var bool
*/
private $trustIRIs = true;
/**
* @return bool
*/
public function getTrustIRIs() {
return $this->trustIRIs;
}
/**
* @param bool $trustIRIs
*/
public function setTrustIRIs( $trustIRIs ) {
$this->trustIRIs = $trustIRIs;
}
/**
* @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 );
$this->transitionTable[self::STATE_OBJECT] = [
self::STATE_DOCUMENT => " .\n",
self::STATE_SUBJECT => " .\n\n",
self::STATE_PREDICATE => " ;\n\t",
self::STATE_OBJECT => ",\n\t\t",
];
$this->transitionTable[self::STATE_DOCUMENT][self::STATE_SUBJECT] = "\n";
$this->transitionTable[self::STATE_SUBJECT][self::STATE_PREDICATE] = ' ';
$this->transitionTable[self::STATE_PREDICATE][self::STATE_OBJECT] = ' ';
$this->transitionTable[self::STATE_START][self::STATE_DOCUMENT] = function () {
$this->beginDocument();
};
}
/**
* Write prefixes
*/
private function beginDocument() {
foreach ( $this->getPrefixes() as $prefix => $uri ) {
$this->write( "@prefix $prefix: <" . $this->quoter->escapeIRI( $uri ) . "> .\n" );
}
}
/**
* @inheritDoc
*/
protected function writeSubject( $base, $local = null ) {
if ( $local !== null ) {
$this->write( "$base:$local" );
} else {
$this->writeIRI( $base, $this->trustIRIs );
}
}
/**
* @inheritDoc
*/
protected function writePredicate( $base, $local = null ) {
if ( $base === 'a' ) {
$this->write( 'a' );
return;
}
if ( $local !== null ) {
$this->write( "$base:$local" );
} else {
$this->writeIRI( $base, $this->trustIRIs );
}
}
/**
* @inheritDoc
*/
protected function writeResource( $base, $local = null ) {
if ( $local !== null ) {
$this->write( "$base:$local" );
} else {
$this->writeIRI( $base );
}
}
/**
* @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() {
return 'text/turtle; charset=UTF-8';
}
}

File Metadata

Mime Type
text/x-php
Expires
Sat, Oct 3, 12:18 (3 d, 8 h ago)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
9d/e4/09527f43bef925bca3a04e0f3b0d
Default Alt Text
TurtleRdfWriter.php (2 KB)

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