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Ensure non-rdf:nil list node references are stored across graphs.

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This commit is contained in:
Dave Longley 2014-09-15 17:04:50 -04:00
parent 8ca3291bc0
commit 8fb6a75e67
1 changed files with 27 additions and 21 deletions
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34
jsonld.php
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@ -2809,8 +2809,7 @@ class JsonLdProcessor {
protected function _fromRDF($dataset, $options) {
$default_graph = new stdClass();
$graph_map = (object)array('@default' => $default_graph);
// TODO: seems like usages could be replaced by this single map
$node_references = (object)array();
$referenced_once = (object)array();
foreach($dataset as $name => $graph) {
if(!property_exists($graph_map, $name)) {
@ -2848,9 +2847,7 @@ class JsonLdProcessor {
// object may be an RDF list/partial list node but we can't know
// easily until all triples are read
if($object_is_id) {
self::addValue(
$node_references, $o->value, $node->{'@id'}, array(
'propertyIsArray' => true));
if($o->value === self::RDF_NIL) {
$object = $node_map->{$o->value};
if(!property_exists($object, 'usages')) {
$object->usages = array();
@ -2859,6 +2856,16 @@ class JsonLdProcessor {
'node' => $node,
'property' => $p,
'value' => $value);
} else if(property_exists($referenced_once, $o->value)) {
// object referenced more than once
$referenced_once->{$o->value} = false;
} else {
// track single reference
$referenced_once->{$o->value} = (object)array(
'node' => $node,
'property' => $p,
'value' => $value);
}
}
}
}
@ -2880,23 +2887,22 @@ class JsonLdProcessor {
$list_nodes = array();
// ensure node is a well-formed list node; it must:
// 1. Be referenced only once and used only once in a list.
// 1. Be referenced only once.
// 2. Have an array for rdf:first that has 1 item.
// 3. Have an array for rdf:rest that has 1 item.
// 4. Have no keys other than: @id, usages, rdf:first, rdf:rest, and,
// 4. Have no keys other than: @id, rdf:first, rdf:rest, and,
// optionally, @type where the value is rdf:List.
$node_key_count = count(array_keys((array)$node));
while($property === self::RDF_REST &&
property_exists($node_references, $node->{'@id'}) &&
count($node_references->{$node->{'@id'}}) === 1 &&
count($node->usages) === 1 &&
property_exists($referenced_once, $node->{'@id'}) &&
is_object($referenced_once->{$node->{'@id'}}) &&
property_exists($node, self::RDF_FIRST) &&
property_exists($node, self::RDF_REST) &&
is_array($node->{self::RDF_FIRST}) &&
is_array($node->{self::RDF_REST}) &&
count($node->{self::RDF_FIRST}) === 1 &&
count($node->{self::RDF_REST}) === 1 &&
($node_key_count === 4 || ($node_key_count === 5 &&
($node_key_count === 3 || ($node_key_count === 4 &&
property_exists($node, '@type') && is_array($node->{'@type'}) &&
count($node->{'@type'}) === 1 &&
$node->{'@type'}[0] === self::RDF_LIST))) {
@ -2904,7 +2910,7 @@ class JsonLdProcessor {
$list_nodes[] = $node->{'@id'};
// get next node, moving backwards through list
$usage = $node->usages[0];
$usage = $referenced_once->{$node->{'@id'}};
$node = $usage->node;
$property = $usage->property;
$head = $usage->value;
@ -2938,6 +2944,8 @@ class JsonLdProcessor {
unset($graph_object->{$list_node});
}
}
unset($nil->usages);
}
$result = array();
@ -2952,14 +2960,12 @@ class JsonLdProcessor {
sort($subjects_);
foreach($subjects_ as $subject_) {
$node_ = $graph_object->{$subject_};
unset($node_->usages);
// only add full subjects to top-level
if(!self::_isSubjectReference($node_)) {
$node->{'@graph'}[] = $node_;
}
}
}
unset($node->usages);
// only add full subjects to top-level
if(!self::_isSubjectReference($node)) {
$result[] = $node;