forked from friendica/php-json-ld
Make nquad methods public.
This commit is contained in:
Dave Longley
parent
f1f8c46542
commit
a4d73b0bb7
356
jsonld.php
356
jsonld.php
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@ -572,7 +572,7 @@ class JsonLdProcessor {
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if($options['format'] === 'application/nquads') {
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$nquads = array();
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foreach($statements as $statement) {
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$nquads[] = $this->_toNQuad($statement);
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$nquads[] = $this->toNQuad($statement);
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}
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sort($nquads);
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$statements = implode($nquads);
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@ -856,6 +856,179 @@ class JsonLdProcessor {
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return $rval;
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}
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/**
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* Parses statements in the form of N-Quads.
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*
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* @param string $input the N-Quads input to parse.
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*
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* @return array the resulting RDF statements.
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*/
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public static function parseNQuads($input) {
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// define partial regexes
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$iri = '(?:<([^:]+:[^>]*)>)';
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$bnode = '(_:(?:[A-Za-z][A-Za-z0-9]*))';
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$plain = '"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"';
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$datatype = "(?:\\^\\^$iri)";
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$language = '(?:@([a-z]+(?:-[a-z0-9]+)*))';
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$literal = "(?:$plain(?:$datatype|$language)?)";
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$ws = '[ \\t]';
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$eoln = '/(?:\r\n)|(?:\n)|(?:\r)/';
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$empty = "/^$ws*$/";
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// define quad part regexes
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$subject = "(?:$iri|$bnode)$ws+";
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$property = "$iri$ws+";
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$object = "(?:$iri|$bnode|$literal)$ws*";
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$graph = "(?:\\.|(?:(?:$iri|$bnode)$ws*\\.))";
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// full quad regex
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$quad = "/^$ws*$subject$property$object$graph$ws*$/";
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// build RDF statements
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$statements = array();
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// split N-Quad input into lines
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$lines = preg_split($eoln, $input);
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$line_number = 0;
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foreach($lines as $line) {
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$line_number += 1;
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// skip empty lines
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if(preg_match($empty, $line)) {
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continue;
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}
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// parse quad
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if(!preg_match($quad, $line, $match)) {
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throw new JsonLdException(
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'Error while parsing N-Quads; invalid quad.',
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'jsonld.ParseError', array('line' => $line_number));
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}
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// create RDF statement
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$s = (object)array(
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'subject' => new stdClass(),
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'property' => new stdClass(),
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'object' => new stdClass());
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// get subject
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if($match[1] !== '') {
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$s->subject->nominalValue = $match[1];
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$s->subject->interfaceName = 'IRI';
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}
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else {
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$s->subject->nominalValue = $match[2];
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$s->subject->interfaceName = 'BlankNode';
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}
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// get property
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$s->property->nominalValue = $match[3];
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$s->property->interfaceName = 'IRI';
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// get object
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if($match[4] !== '') {
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$s->object->nominalValue = $match[4];
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$s->object->interfaceName = 'IRI';
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}
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else if($match[5] !== '') {
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$s->object->nominalValue = $match[5];
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$s->object->interfaceName = 'BlankNode';
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}
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else {
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$s->object->nominalValue = $match[6];
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$s->object->interfaceName = 'LiteralNode';
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if(isset($match[7]) && $match[7] !== '') {
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$s->object->datatype = (object)array(
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'nominalValue' => $match[7], 'interfaceName' => 'IRI');
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}
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else if(isset($match[8]) && $match[8] !== '') {
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$s->object->language = $match[8];
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}
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}
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// get graph
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if(isset($match[9]) && $match[9] !== '') {
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$s->name = (object)array(
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'nominalValue' => $match[9], 'interfaceName' => 'IRI');
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}
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else if(isset($match[10]) && $match[10] !== '') {
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$s->name = (object)array(
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'nominalValue' => $match[10], 'interfaceName' => 'BlankNode');
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}
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// add statement
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$statements[] = $s;
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}
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return $statements;
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}
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/**
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* Converts an RDF statement to an N-Quad string (a single quad).
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*
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* @param stdClass $statement the RDF statement to convert.
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* @param string $bnode the bnode the staetment is mapped to (optional, for
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* use during normalization only).
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*
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* @return the N-Quad string.
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*/
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public static function toNQuad($statement, $bnode=null) {
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$s = $statement->subject;
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$p = $statement->property;
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$o = $statement->object;
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$g = property_exists($statement, 'name') ? $statement->name : null;
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$quad = '';
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// subject is an IRI or bnode
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if($s->interfaceName === 'IRI') {
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$quad .= "<{$s->nominalValue}>";
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}
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// normalization mode
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else if($bnode !== null) {
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$quad .= ($s->nominalValue === $bnode) ? '_:a' : '_:z';
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}
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// normal mode
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else {
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$quad .= $s->nominalValue;
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}
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// property is always an IRI
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$quad .= " <{$p->nominalValue}> ";
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// object is IRI, bnode, or literal
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if($o->interfaceName === 'IRI') {
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$quad .= "<{$o->nominalValue}>";
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}
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else if($o->interfaceName === 'BlankNode') {
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// normalization mode
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if($bnode !== null) {
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$quad .= ($o->nominalValue === $bnode) ? '_:a' : '_:z';
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}
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// normal mode
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else {
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$quad .= $o->nominalValue;
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}
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}
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else {
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$quad .= '"' . $o->nominalValue . '"';
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if(property_exists($o, 'datatype')) {
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$quad .= "^^<{$o->datatype->nominalValue}>";
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}
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else if(property_exists($o, 'language')) {
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$quad .= '@' . $o->language;
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}
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}
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// graph
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if($g !== null) {
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$quad .= " <{$g->nominalValue}>";
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}
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$quad .= " .\n";
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return $quad;
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}
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/**
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* Registers a processor-specific RDF Statement parser by content-type.
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* Global parsers will no longer be used by this processor.
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@ -1415,7 +1588,7 @@ class JsonLdProcessor {
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$statement->{$node}->nominalValue);
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}
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}
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$normalized[] = $this->_toNQuad($statement);
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$normalized[] = $this->toNQuad($statement);
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}
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// sort normalized output
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@ -1434,7 +1607,7 @@ class JsonLdProcessor {
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}
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// return parsed RDF statements
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return $this->_parseNQuads(implode($normalized));
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return $this->parseNQuads(implode($normalized));
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}
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/**
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@ -1952,7 +2125,7 @@ class JsonLdProcessor {
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$statements = $bnodes->{$id}->statements;
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$nquads = array();
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foreach($statements as $statement) {
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$nquads[] = $this->_toNQuad($statement, $id);
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$nquads[] = $this->toNQuad($statement, $id);
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}
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// sort serialized quads
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@ -3591,184 +3764,11 @@ class JsonLdProcessor {
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protected static function _isAbsoluteIri($v) {
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return strpos($v, ':') !== false;
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}
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/**
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* Parses statements in the form of N-Quads.
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*
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* @param string $input the N-Quads input to parse.
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*
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* @return array the resulting RDF statements.
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*/
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protected static function _parseNQuads($input) {
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// define partial regexes
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$iri = '(?:<([^:]+:[^>]*)>)';
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$bnode = '(_:(?:[A-Za-z][A-Za-z0-9]*))';
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$plain = '"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"';
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$datatype = "(?:\\^\\^$iri)";
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$language = '(?:@([a-z]+(?:-[a-z0-9]+)*))';
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$literal = "(?:$plain(?:$datatype|$language)?)";
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$ws = '[ \\t]';
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$eoln = '/(?:\r\n)|(?:\n)|(?:\r)/';
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$empty = "/^$ws*$/";
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// define quad part regexes
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$subject = "(?:$iri|$bnode)$ws+";
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$property = "$iri$ws+";
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$object = "(?:$iri|$bnode|$literal)$ws*";
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$graph = "(?:\\.|(?:(?:$iri|$bnode)$ws*\\.))";
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// full quad regex
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$quad = "/^$ws*$subject$property$object$graph$ws*$/";
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// build RDF statements
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$statements = array();
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// split N-Quad input into lines
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$lines = preg_split($eoln, $input);
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$line_number = 0;
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foreach($lines as $line) {
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$line_number += 1;
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// skip empty lines
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if(preg_match($empty, $line)) {
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continue;
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}
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// parse quad
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if(!preg_match($quad, $line, $match)) {
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throw new JsonLdException(
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'Error while parsing N-Quads; invalid quad.',
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'jsonld.ParseError', array('line' => $line_number));
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}
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// create RDF statement
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$s = (object)array(
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'subject' => new stdClass(),
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'property' => new stdClass(),
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'object' => new stdClass());
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// get subject
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if($match[1] !== '') {
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$s->subject->nominalValue = $match[1];
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$s->subject->interfaceName = 'IRI';
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}
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else {
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$s->subject->nominalValue = $match[2];
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$s->subject->interfaceName = 'BlankNode';
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}
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// get property
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$s->property->nominalValue = $match[3];
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$s->property->interfaceName = 'IRI';
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// get object
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if($match[4] !== '') {
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$s->object->nominalValue = $match[4];
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$s->object->interfaceName = 'IRI';
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}
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else if($match[5] !== '') {
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$s->object->nominalValue = $match[5];
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$s->object->interfaceName = 'BlankNode';
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}
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else {
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$s->object->nominalValue = $match[6];
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$s->object->interfaceName = 'LiteralNode';
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if(isset($match[7]) && $match[7] !== '') {
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$s->object->datatype = (object)array(
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'nominalValue' => $match[7], 'interfaceName' => 'IRI');
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}
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else if(isset($match[8]) && $match[8] !== '') {
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$s->object->language = $match[8];
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}
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}
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// get graph
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if(isset($match[9]) && $match[9] !== '') {
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$s->name = (object)array(
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'nominalValue' => $match[9], 'interfaceName' => 'IRI');
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}
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else if(isset($match[10]) && $match[10] !== '') {
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$s->name = (object)array(
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'nominalValue' => $match[10], 'interfaceName' => 'BlankNode');
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}
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// add statement
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$statements[] = $s;
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}
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return $statements;
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}
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/**
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* Converts an RDF statement to an N-Quad string (a single quad).
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*
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* @param stdClass $statement the RDF statement to convert.
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* @param string $bnode the bnode the staetment is mapped to (optional, for
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* use during normalization only).
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*
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* @return the N-Quad string.
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*/
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protected static function _toNQuad($statement, $bnode=null) {
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$s = $statement->subject;
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$p = $statement->property;
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$o = $statement->object;
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$g = property_exists($statement, 'name') ? $statement->name : null;
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$quad = '';
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// subject is an IRI or bnode
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if($s->interfaceName === 'IRI') {
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$quad .= "<{$s->nominalValue}>";
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}
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// normalization mode
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else if($bnode !== null) {
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$quad .= ($s->nominalValue === $bnode) ? '_:a' : '_:z';
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}
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// normal mode
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else {
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$quad .= $s->nominalValue;
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}
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// property is always an IRI
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$quad .= " <{$p->nominalValue}> ";
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// object is IRI, bnode, or literal
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if($o->interfaceName === 'IRI') {
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$quad .= "<{$o->nominalValue}>";
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}
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else if($o->interfaceName === 'BlankNode') {
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// normalization mode
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if($bnode !== null) {
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$quad .= ($o->nominalValue === $bnode) ? '_:a' : '_:z';
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}
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// normal mode
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else {
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$quad .= $o->nominalValue;
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}
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}
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else {
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$quad .= '"' . $o->nominalValue . '"';
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if(property_exists($o, 'datatype')) {
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$quad .= "^^<{$o->datatype->nominalValue}>";
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}
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else if(property_exists($o, 'language')) {
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$quad .= '@' . $o->language;
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}
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}
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// graph
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if($g !== null) {
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$quad .= " <{$g->nominalValue}>";
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}
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$quad .= " .\n";
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return $quad;
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}
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}
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// register the N-Quads RDF parser
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jsonld_register_rdf_parser(
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'application/nquads', 'JsonLdProcessor::_parseNQuads');
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'application/nquads', 'JsonLdProcessor::parseNQuads');
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/**
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* A JSON-LD Exception.
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