Add support for partial lists.
This commit is contained in:
Dave Longley
parent
ff79a799ba
commit
281d8ee797
158
jsonld.php
158
jsonld.php
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@ -610,6 +610,7 @@ class JsonLdProcessor {
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const XSD_STRING = 'http://www.w3.org/2001/XMLSchema#string';
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/** RDF constants */
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const RDF_LIST = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#List';
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const RDF_FIRST = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#first';
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const RDF_REST = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#rest';
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const RDF_NIL = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#nil';
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@ -2431,7 +2432,11 @@ class JsonLdProcessor {
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$ids = array_keys((array)$node_map);
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sort($ids);
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foreach($ids as $id) {
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$subject->{'@graph'}[] = $node_map->{$id};
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$node = $node_map->{$id};
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// only add full subjects
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if(!self::_isSubjectReference($node)) {
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$subject->{'@graph'}[] = $node;
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}
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}
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}
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@ -2440,7 +2445,11 @@ class JsonLdProcessor {
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$keys = array_keys((array)$default_graph);
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sort($keys);
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foreach($keys as $key) {
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$flattened[] = $default_graph->{$key};
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$node = $default_graph->{$key};
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// only add full subjects to top-level
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if(self::_isSubjectReference($node)) {
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$flattened[] = $node;
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}
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}
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return $flattened;
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}
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@ -2665,8 +2674,7 @@ class JsonLdProcessor {
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$node = $node_map->{$s};
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$object_is_id = ($o->type === 'IRI' || $o->type === 'blank node');
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if($object_is_id && $o->value !== self::RDF_NIL &&
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!property_exists($node_map, $o->value)) {
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if($object_is_id && !property_exists($node_map, $o->value)) {
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$node_map->{$o->value} = (object)array('@id' => $o->value);
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}
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@ -2676,90 +2684,94 @@ class JsonLdProcessor {
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continue;
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}
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if($object_is_id &&
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$o->value === self::RDF_NIL && $p !== self::RDF_REST) {
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// empty list detected
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$value = (object)array('@list' => array());
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}
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else {
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$value = self::_RDFToObject($o, $options['useNativeTypes']);
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}
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$value = self::_RDFToObject($o, $options['useNativeTypes']);
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self::addValue($node, $p, $value, array('propertyIsArray' => true));
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// object may be the head of an RDF list but we can't know easily
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// until all triples are read
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if($o->type === 'blank node' &&
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!($p === self::RDF_FIRST || $p === self::RDF_REST)) {
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// object may be an RDF list/partial list node but we can't know
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// easily until all triples are read
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if($object_is_id) {
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$object = $node_map->{$o->value};
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if(!property_exists($object, 'listHeadFor')) {
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$object->listHeadFor = $value;
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}
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// can't be a list head if referenced more than once
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else {
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$object->listHeadFor = null;
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if(!property_exists($object, 'usages')) {
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$object->usages = array();
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}
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$object->usages[] = (object)array(
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'node' => $node,
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'property' => $p,
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'value' => $value);
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}
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}
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}
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// convert linked lists to @list arrays
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foreach($graph_map as $name => $graph_object) {
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foreach($graph_object as $subject => $node) {
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// if subject not in graph_object, it has been removed as it was
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// part of an RDF list, continue
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if(!property_exists($graph_object, $subject)) {
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continue;
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}
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// if value is not an object, it can't be a list head, continue
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$value = (property_exists($node, 'listHeadFor') ?
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$node->listHeadFor : null);
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if(!is_object($value)) {
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continue;
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}
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// no @lists to be converted, continue
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if(!property_exists($graph_object, self::RDF_NIL)) {
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continue;
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}
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$list = array();
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$eliminated_nodes = new stdClass();
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while($subject !== self::RDF_NIL && $list !== null) {
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// ensure node is a valid list node; node must:
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// 1. Be a blank node
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// 2. Have no keys other than: @id, listHeadFor, rdf:first, rdf:rest.
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// 3. Have an array for rdf:first that has 1 item.
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// 4. Have an array for rdf:rest that has 1 object with @id.
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// 5. Not already be in a list (it is in the eliminated nodes map).
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$node_key_count = (is_object($node) ?
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count(array_keys((array)$node)) : 0);
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if(!(is_object($node) && strpos($node->{'@id'}, '_:') === 0 &&
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($node_key_count === 3 || ($node_key_count === 4 &&
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property_exists($node, 'listHeadFor'))) &&
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property_exists($node, self::RDF_FIRST) &&
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property_exists($node, self::RDF_REST) &&
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is_array($node->{self::RDF_FIRST}) &&
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count($node->{self::RDF_FIRST}) === 1 &&
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is_array($node->{self::RDF_REST}) &&
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count($node->{self::RDF_REST}) === 1 &&
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is_object($node->{self::RDF_REST}[0]) &&
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property_exists($node->{self::RDF_REST}[0], '@id') &&
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!property_exists($eliminated_nodes, $subject))) {
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$list = null;
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// iterate backwards through each RDF list
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$nil = $graph_object->{self::RDF_NIL};
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foreach($nil->usages as $usage) {
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$node = $usage->node;
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$property = $usage->property;
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$head = $usage->value;
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$list = [];
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$list_nodes = [];
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// ensure node is a well-formed list node; it must:
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// 1. Be used only once in a list.
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// 2. Have an array for rdf:first that has 1 item.
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// 3. Have an array for rdf:rest that has 1 item.
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// 4. Have no keys other than: @id, usages, rdf:first, rdf:rest, and,
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// optionally, @type where the value is rdf:List.
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$node_key_count = count(array_keys((array)$node));
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while($property === self::RDF_REST && count($node->usages) === 1 &&
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property_exists($node, self::RDF_FIRST) &&
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property_exists($node, self::RDF_REST) &&
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is_array($node->{self::RDF_FIRST}) &&
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is_array($node->{self::RDF_REST}) &&
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count($node->{self::RDF_FIRST}) === 1 &&
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count($node->{self::RDF_REST}) === 1 &&
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($node_key_count === 4 || ($node_key_count === 5 &&
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property_exists($node, '@type') && is_array($node->{'@type'}) &&
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count($node->{'@type'}) === 1 &&
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$node->{'@type'}[0] === self::RDF_LIST))) {
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$list[] = $node->{self::RDF_FIRST}[0];
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$list_nodes[] = $node->{'@id'};
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// get next node, moving backwards through list
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$usage = $node->usages[0];
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$node = $usage->node;
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$property = $usage->property;
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$head = $usage->value;
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$node_key_count = count(array_keys((array)$node));
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// if node is not a blank node, then list head found
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if(strpos($node->{'@id'}, '_:') !== 0) {
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break;
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}
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$list[] = $node->{self::RDF_FIRST}[0];
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$eliminated_nodes->{$node->{'@id'}} = true;
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$subject = $node->{self::RDF_REST}[0]->{'@id'};
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$node = (property_exists($graph_object, $subject) ?
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$graph_object->{$subject} : null);
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}
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// bad list detected, skip it
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if($list === null) {
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continue;
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// list is nested in another list
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if($property === self::RDF_FIRST) {
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// empty list
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if($node->{'@id'} === self::RDF_NIL) {
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// can't convert rdf:nil to a @list object because it would
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// result in a list of lists which isn't supported
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continue;
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}
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// preserve list head
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$head = $graph_object->{$head->{'@id'}}->{self::RDF_REST}[0];
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array_pop($list);
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array_pop($list_nodes);
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}
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unset($value->{'@id'});
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$value->{'@list'} = $list;
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foreach($eliminated_nodes as $id => $b) {
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unset($graph_object->{$id});
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// transform list into @list object
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unset($head->{'@id'});
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$head->{'@list'} = array_reverse($list);
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foreach($list_nodes as $list_node) {
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unset($graph_object->{$list_node});
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}
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}
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}
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@ -2776,14 +2788,14 @@ class JsonLdProcessor {
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sort($subjects_);
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foreach($subjects_ as $subject_) {
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$node_ = $graph_object->{$subject_};
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unset($node_->listHeadFor);
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unset($node_->usages);
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// only add full subjects to top-level
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if(!self::_isSubjectReference($node_)) {
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$node->{'@graph'}[] = $node_;
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}
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}
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}
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unset($node->listHeadFor);
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unset($node->usages);
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// only add full subjects to top-level
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if(!self::_isSubjectReference($node)) {
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$result[] = $node;
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