forked from friendica/php-json-ld
Update fromRDF to comply with recent changes to the spec.
This commit is contained in:
Dave Longley
parent
66bddc2ab9
commit
4d4334ea43
243
jsonld.php
243
jsonld.php
|
|
@ -1,7 +1,7 @@
|
|||
<?php
|
||||
/**
|
||||
* PHP implementation of the JSON-LD API.
|
||||
* Version: 0.0.32
|
||||
* Version: 0.0.33
|
||||
*
|
||||
* @author Dave Longley
|
||||
*
|
||||
|
|
@ -2502,153 +2502,147 @@ class JsonLdProcessor {
|
|||
* @return array the JSON-LD output.
|
||||
*/
|
||||
protected function _fromRDF($dataset, $options) {
|
||||
// prepare graph map (maps graph name => subjects, lists)
|
||||
$default_graph = (object)array(
|
||||
'subjects' => new stdClass(), 'listMap' => new stdClass());
|
||||
$graphs = (object)array('@default' => $default_graph);
|
||||
$default_graph = new stdClass();
|
||||
$graph_map = (object)array('@default' => $default_graph);
|
||||
|
||||
foreach($dataset as $graph_name => $triples) {
|
||||
foreach($triples as $triple) {
|
||||
foreach($dataset as $name => $graph) {
|
||||
if(!property_exists($graph_map, $name)) {
|
||||
$graph_map->{$name} = new stdClass();
|
||||
}
|
||||
if($name !== '@default' && !property_exists($default_graph, $name)) {
|
||||
$default_graph->{$name} = (object)array('@id' => $name);
|
||||
}
|
||||
$node_map = $graph_map->{$name};
|
||||
foreach($graph as $triple) {
|
||||
// get subject, predicate, object
|
||||
$s = $triple->subject->value;
|
||||
$p = $triple->predicate->value;
|
||||
$o = $triple->object;
|
||||
|
||||
// create a named graph entry as needed
|
||||
if(!property_exists($graphs, $graph_name)) {
|
||||
$graph = $graphs->{$graph_name} = (object)array(
|
||||
'subjects' => new stdClass(), 'listMap' => new stdClass());
|
||||
if(!property_exists($node_map, $s)) {
|
||||
$node_map->{$s} = (object)array('@id' => $s);
|
||||
}
|
||||
else {
|
||||
$graph = $graphs->{$graph_name};
|
||||
$node = $node_map->{$s};
|
||||
|
||||
$object_is_id = ($o->type === 'IRI' || $o->type === 'blank node');
|
||||
if($object_is_id && $o->value !== self::RDF_NIL &&
|
||||
!property_exists($node_map, $o->value)) {
|
||||
$node_map->{$o->value} = (object)array('@id' => $o->value);
|
||||
}
|
||||
|
||||
// handle element in @list
|
||||
if($p === self::RDF_FIRST) {
|
||||
// create list entry as needed
|
||||
$list_map = $graph->listMap;
|
||||
if(!property_exists($list_map, $s)) {
|
||||
$entry = $list_map->{$s} = new stdClass();
|
||||
}
|
||||
else {
|
||||
$entry = $list_map->{$s};
|
||||
}
|
||||
// set object value
|
||||
$entry->first = $this->_RDFToObject($o, $options['useNativeTypes']);
|
||||
continue;
|
||||
}
|
||||
|
||||
// handle other element in @list
|
||||
if($p === self::RDF_REST) {
|
||||
// set next in list
|
||||
if($o->type === 'blank node') {
|
||||
// create list entry as needed
|
||||
$list_map = $graph->listMap;
|
||||
if(!property_exists($list_map, $s)) {
|
||||
$entry = $list_map->{$s} = new stdClass();
|
||||
}
|
||||
else {
|
||||
$entry = $list_map->{$s};
|
||||
}
|
||||
$entry->rest = $o->value;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// add graph subject to the default graph as needed
|
||||
if($graph_name !== '@default' &&
|
||||
!property_exists($default_graph->subjects, $graph_name)) {
|
||||
$default_graph->subjects->{$graph_name} = (object)array(
|
||||
'@id' => $graph_name);
|
||||
}
|
||||
|
||||
// add subject to graph as needed
|
||||
$subjects = $graph->subjects;
|
||||
if(!property_exists($subjects, $s)) {
|
||||
$value = $subjects->{$s} = (object)array('@id' => $s);
|
||||
}
|
||||
// use existing subject value
|
||||
else {
|
||||
$value = $subjects->{$s};
|
||||
}
|
||||
|
||||
// convert to @type unless options indicate to treat rdf:type as property
|
||||
if($p === self::RDF_TYPE && !$options['useRdfType']) {
|
||||
// add value of object as @type
|
||||
if($p === self::RDF_TYPE && $object_is_id) {
|
||||
self::addValue(
|
||||
$value, '@type', $o->value, array('propertyIsArray' => true));
|
||||
$node, '@type', $o->value, array('propertyIsArray' => true));
|
||||
continue;
|
||||
}
|
||||
|
||||
if($object_is_id &&
|
||||
$o->value === self::RDF_NIL && $p !== self::RDF_REST) {
|
||||
// empty list detected
|
||||
$value = (object)array('@list' => array());
|
||||
}
|
||||
else {
|
||||
// add property to value as needed
|
||||
$object = $this->_RDFToObject($o, $options['useNativeTypes']);
|
||||
self::addValue($value, $p, $object, array('propertyIsArray' => true));
|
||||
$value = self::_RDFToObject($o, $options['useNativeTypes']);
|
||||
}
|
||||
self::addValue($node, $p, $value, array('propertyIsArray' => true));
|
||||
|
||||
// a bnode might be the beginning of a list, so add it to the list map
|
||||
if($o->type === 'blank node') {
|
||||
$id = $object->{'@id'};
|
||||
$list_map = $graph->listMap;
|
||||
if(!property_exists($list_map, $id)) {
|
||||
$entry = $list_map->{$id} = new stdClass();
|
||||
}
|
||||
else {
|
||||
$entry = $list_map->{$id};
|
||||
}
|
||||
$entry->head = $object;
|
||||
// object may be the head of an RDF list but we can't know easily
|
||||
// until all triples are read
|
||||
if($o->type === 'blank node' &&
|
||||
!($p === self::RDF_FIRST || $p === self::RDF_REST)) {
|
||||
$object = $node_map->{$o->value};
|
||||
if(!property_exists($object, 'listHeadFor')) {
|
||||
$object->listHeadFor = $value;
|
||||
}
|
||||
// can't be a list head if referenced more than once
|
||||
else {
|
||||
$object->listHeadFor = null;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// build @lists
|
||||
foreach($graphs as $graph_name => $graph) {
|
||||
// find list head
|
||||
$list_map = $graph->listMap;
|
||||
foreach($list_map as $subject => $entry) {
|
||||
// head found, build lists
|
||||
if(property_exists($entry, 'head') &&
|
||||
property_exists($entry, 'first')) {
|
||||
// replace bnode @id with @list
|
||||
$value = $entry->head;
|
||||
unset($value->{'@id'});
|
||||
$list = array($entry->first);
|
||||
while(property_exists($entry, 'rest')) {
|
||||
$rest = $entry->rest;
|
||||
$entry = $list_map->{$rest};
|
||||
if(!property_exists($entry, 'first')) {
|
||||
throw new JsonLdException(
|
||||
'Invalid RDF list entry.',
|
||||
'jsonld.RdfError', array('bnode' => $rest));
|
||||
}
|
||||
$list[] = $entry->first;
|
||||
// convert linked lists to @list arrays
|
||||
foreach($graph_map as $name => $graph_object) {
|
||||
foreach($graph_object as $subject => $node) {
|
||||
// if subject not in graph_object, it has been removed as it was
|
||||
// part of an RDF list, continue
|
||||
if(!property_exists($graph_object, $subject)) {
|
||||
continue;
|
||||
}
|
||||
// if value is not an object, it can't be a list head, continue
|
||||
$value = (property_exists($node, 'listHeadFor') ?
|
||||
$node->listHeadFor : null);
|
||||
if(!is_object($value)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
$list = array();
|
||||
$eliminated_nodes = new stdClass();
|
||||
while($subject !== self::RDF_NIL && $list !== null) {
|
||||
// ensure node is a valid list node; node must:
|
||||
// 1. Be a blank node
|
||||
// 2. Have no keys other than: @id, listHeadFor, rdf:first, rdf:rest.
|
||||
// 3. Have an array for rdf:first that has 1 item.
|
||||
// 4. Have an array for rdf:rest that has 1 object with @id.
|
||||
// 5. Not already be in a list (it is in the eliminated nodes map).
|
||||
$node_key_count = (is_object($node) ?
|
||||
count(array_keys((array)$node)) : 0);
|
||||
if(!(is_object($node) && strpos($node->{'@id'}, '_:') === 0 &&
|
||||
($node_key_count === 3 || ($node_key_count === 4 &&
|
||||
property_exists($node, 'listHeadFor'))) &&
|
||||
is_array($node->{self::RDF_FIRST}) &&
|
||||
count($node->{self::RDF_FIRST}) === 1 &&
|
||||
is_array($node->{self::RDF_REST}) &&
|
||||
count($node->{self::RDF_REST}) === 1 &&
|
||||
is_object($node->{self::RDF_REST}[0]) &&
|
||||
property_exists($node->{self::RDF_REST}[0], '@id') &&
|
||||
!property_exists($eliminated_nodes, $subject))) {
|
||||
$list = null;
|
||||
break;
|
||||
}
|
||||
$value->{'@list'} = $list;
|
||||
|
||||
$list[] = $node->{self::RDF_FIRST}[0];
|
||||
$eliminated_nodes->{$node->{'@id'}} = true;
|
||||
$subject = $node->{self::RDF_REST}[0]->{'@id'};
|
||||
$node = (property_exists($graph_object, $subject) ?
|
||||
$graph_object->{$subject} : null);
|
||||
}
|
||||
|
||||
// bad list detected, skip it
|
||||
if($list === null) {
|
||||
continue;
|
||||
}
|
||||
|
||||
unset($value->{'@id'});
|
||||
$value->{'@list'} = $list;
|
||||
foreach($eliminated_nodes as $id => $b) {
|
||||
unset($graph_object->{$id});
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// build default graph in subject @id order
|
||||
$output = array();
|
||||
$subjects = $default_graph->subjects;
|
||||
$ids = array_keys((array)$subjects);
|
||||
sort($ids);
|
||||
foreach($ids as $i => $id) {
|
||||
// add subject to default graph
|
||||
$subject = $subjects->{$id};
|
||||
$output[] = $subject;
|
||||
|
||||
// output named graph in subject @id order
|
||||
if(property_exists($graphs, $id)) {
|
||||
$graph = array();
|
||||
$subjects_ = $graphs->{$id}->subjects;
|
||||
$ids_ = array_keys((array)$subjects_);
|
||||
sort($ids_);
|
||||
foreach($ids_ as $i_ => $id_) {
|
||||
$graph[] = $subjects_->{$id_};
|
||||
$result = array();
|
||||
$subjects = array_keys((array)$default_graph);
|
||||
sort($subjects);
|
||||
foreach($subjects as $subject) {
|
||||
$node = $default_graph->{$subject};
|
||||
if(property_exists($graph_map, $subject)) {
|
||||
$node->{'@graph'} = array();
|
||||
$graph_object = $graph_map->{$subject};
|
||||
$subjects_ = array_keys((array)$graph_object);
|
||||
sort($subjects_);
|
||||
foreach($subjects_ as $subject_) {
|
||||
$node_ = $graph_object->{$subject_};
|
||||
unset($node_->listHeadFor);
|
||||
$node->{'@graph'}[] = $node_;
|
||||
}
|
||||
$subject->{'@graph'} = $graph;
|
||||
}
|
||||
unset($node->listHeadFor);
|
||||
$result[] = $node;
|
||||
}
|
||||
return $output;
|
||||
|
||||
return $result;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -3081,11 +3075,6 @@ class JsonLdProcessor {
|
|||
* @return stdClass the JSON-LD object.
|
||||
*/
|
||||
protected function _RDFToObject($o, $use_native_types) {
|
||||
// convert empty list
|
||||
if($o->type === 'IRI' && $o->value === self::RDF_NIL) {
|
||||
return (object)array('@list' => array());
|
||||
}
|
||||
|
||||
// convert IRI/blank node object to JSON-LD
|
||||
if($o->type === 'IRI' || $o->type === 'blank node') {
|
||||
return (object)array('@id' => $o->value);
|
||||
|
|
|
|||
Loading…
Reference in a new issue