Implement new experimental embed API.
- See: https://github.com/json-ld/json-ld.org/issues/377
This commit is contained in:
Dave Longley
parent
237a405175
commit
7be06f2ee2
439
jsonld.php
439
jsonld.php
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@ -105,6 +105,31 @@ function jsonld_frame($input, $frame, $options=array()) {
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return $p->frame($input, $frame, $options);
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}
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/**
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* **Experimental**
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*
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* Links a JSON-LD document's nodes in memory.
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*
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* @param mixed $input the JSON-LD document to link.
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* @param mixed $ctx the JSON-LD context to apply or null.
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* @param assoc [$options] the options to use:
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* [base] the base IRI to use.
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* [expandContext] a context to expand with.
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* [documentLoader(url)] the document loader.
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*
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* @return the linked JSON-LD output.
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*/
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function jsonld_link($input, $ctx, $options) {
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// API matches running frame with a wildcard frame and embed: '@link'
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// get arguments
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$frame = new stdClass();
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if($ctx) {
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$frame->{'@context'} = $ctx;
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}
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$frame->{'@embed'} = '@link';
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return jsonld_frame($input, $frame, $options);
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};
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/**
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* Performs RDF dataset normalization on the given JSON-LD input. The output
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* is an RDF dataset unless the 'format' option is used.
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@ -827,7 +852,13 @@ class JsonLdProcessor {
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'graph' => false,
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'skipExpansion' => false,
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'activeCtx' => false,
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'documentLoader' => $jsonld_default_load_document));
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'documentLoader' => $jsonld_default_load_document,
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'link' => false));
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if($options['link']) {
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// force skip expansion when linking, "link" is not part of the
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// public API, it should only be called from framing
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$options['skipExpansion'] = true;
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}
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if($options['skipExpansion'] === true) {
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$expanded = $input;
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@ -1080,7 +1111,8 @@ class JsonLdProcessor {
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* @param $options the framing options.
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* [base] the base IRI to use.
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* [expandContext] a context to expand with.
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* [embed] default @embed flag (default: true).
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* [embed] default @embed flag: '@last', '@always', '@never', '@link'
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* (default: '@last').
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* [explicit] default @explicit flag (default: false).
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* [requireAll] default @requireAll flag (default: true).
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* [omitDefault] default @omitDefault flag (default: false).
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@ -1093,7 +1125,7 @@ class JsonLdProcessor {
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self::setdefaults($options, array(
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'base' => is_string($input) ? $input : '',
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'compactArrays' => true,
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'embed' => true,
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'embed' => '@last',
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'explicit' => false,
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'requireAll' => true,
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'omitDefault' => false,
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@ -1165,9 +1197,11 @@ class JsonLdProcessor {
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$framed = $this->_frame($expanded, $expanded_frame, $options);
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try {
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// compact result (force @graph option to true)
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// compact result (force @graph option to true, skip expansion, check
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// for linked embeds)
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$options['graph'] = true;
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$options['skipExpansion'] = true;
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$options['link'] = new ArrayObject();
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$options['activeCtx'] = true;
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$result = $this->compact($framed, $ctx, $options);
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} catch(Exception $e) {
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@ -1182,6 +1216,7 @@ class JsonLdProcessor {
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// get graph alias
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$graph = $this->_compactIri($active_ctx, '@graph');
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// remove @preserve from results
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$options['link'] = new ArrayObject();
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$compacted->{$graph} = $this->_removePreserve(
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$active_ctx, $compacted->{$graph}, $options);
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return $compacted;
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@ -1968,18 +2003,48 @@ class JsonLdProcessor {
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// recursively compact object
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if(is_object($element)) {
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if($options['link'] && property_exists($element, '@id') &&
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isset($options['link'][$element->{'@id'}])) {
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// check for a linked element to reuse
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$linked = $options['link'][$element->{'@id'}];
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foreach($linked as $link) {
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if($link['expanded'] === $element) {
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return $link['compacted'];
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}
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}
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}
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// do value compaction on @values and subject references
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if(self::_isValue($element) || self::_isSubjectReference($element)) {
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return $this->_compactValue($active_ctx, $active_property, $element);
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$rval = $this->_compactValue($active_ctx, $active_property, $element);
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if($options['link'] && self::_isSubjectReference($element)) {
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// store linked element
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if(!isset($options['link'][$element->{'@id'}])) {
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$options['link'][$element->{'@id'}] = array();
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}
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$options['link'][$element->{'@id'}][] = array(
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'expanded' => $element, 'compacted' => $rval);
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}
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return $rval;
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}
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// FIXME: avoid misuse of active property as an expanded property?
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$inside_reverse = ($active_property === '@reverse');
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$rval = new stdClass();
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if($options['link'] && property_exists($element, '@id')) {
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// store linked element
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if(!isset($options['link'][$element->{'@id'}])) {
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$options['link'][$element->{'@id'}] = array();
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}
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$options['link'][$element->{'@id'}][] = array(
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'expanded' => $element, 'compacted' => $rval);
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}
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// process element keys in order
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$keys = array_keys((array)$element);
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sort($keys);
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$rval = new stdClass();
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foreach($keys as $expanded_property) {
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$expanded_value = $element->{$expanded_property};
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@ -2643,7 +2708,9 @@ class JsonLdProcessor {
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'options' => $options,
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'graphs' => (object)array(
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'@default' => new stdClass(),
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'@merged' => new stdClass()));
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'@merged' => new stdClass()),
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'subjectStack' => array(),
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'link' => new stdClass());
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// produce a map of all graphs and name each bnode
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// FIXME: currently uses subjects from @merged graph only
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@ -3699,157 +3766,187 @@ class JsonLdProcessor {
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protected function _matchFrame(
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$state, $subjects, $frame, $parent, $property) {
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// validate the frame
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$this->_validateFrame($state, $frame);
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$this->_validateFrame($frame);
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$frame = $frame[0];
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// get flags for current frame
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$options = $state->options;
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$embed_on = $this->_getFrameFlag($frame, $options, 'embed');
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$explicit_on = $this->_getFrameFlag($frame, $options, 'explicit');
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$require_all_on = $this->_getFrameFlag($frame, $options, 'requireAll');
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$flags = array(
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'embed' => $embed_on,
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'explicit' => $explicit_on,
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'requireAll' => $require_all_on);
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'embed' => $this->_getFrameFlag($frame, $options, 'embed'),
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'explicit' => $this->_getFrameFlag($frame, $options, 'explicit'),
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'requireAll' => $this->_getFrameFlag($frame, $options, 'requireAll'));
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// filter out subjects that match the frame
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$matches = $this->_filterSubjects($state, $subjects, $frame, $flags);
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// add matches to output
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foreach($matches as $id => $subject) {
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/* Note: In order to treat each top-level match as a compartmentalized
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result, create an independent copy of the embedded subjects map when the
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property is null, which only occurs at the top-level. */
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if($property === null) {
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$state->embeds = new stdClass();
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if($flags['embed'] === '@link' && property_exists($state->link, $id)) {
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// TODO: may want to also match an existing linked subject against
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// the current frame ... so different frames could produce different
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// subjects that are only shared in-memory when the frames are the same
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// add existing linked subject
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$this->_addFrameOutput($parent, $property, $state->link->{$id});
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continue;
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}
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// start output
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/* Note: In order to treat each top-level match as a compartmentalized
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result, clear the unique embedded subjects map when the property is null,
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which only occurs at the top-level. */
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if($property === null) {
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$state->uniqueEmbeds = new stdClass();
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}
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// start output for subject
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$output = new stdClass();
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$output->{'@id'} = $id;
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$state->link->{$id} = $output;
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// prepare embed meta info
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$embed = (object)array('parent' => $parent, 'property' => $property);
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// if embed is @never or if a circular reference would be created by an
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// embed, the subject cannot be embedded, just add the reference;
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// note that a circular reference won't occur when the embed flag is
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// `@link` as the above check will short-circuit before reaching this point
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if($flags['embed'] === '@never' ||
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$this->_createsCircularReference($subject, $state->subjectStack)) {
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$this->_addFrameOutput($parent, $property, $output);
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continue;
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}
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// if embed is on and there is an existing embed
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if($embed_on && property_exists($state->embeds, $id)) {
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// only overwrite an existing embed if it has already been added to its
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// parent -- otherwise its parent is somewhere up the tree from this
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// embed and the embed would occur twice once the tree is added
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$embed_on = false;
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// existing embed's parent is an array
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$existing = $state->embeds->{$id};
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if(is_array($existing->parent)) {
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foreach($existing->parent as $p) {
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if(self::compareValues($output, $p)) {
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$embed_on = true;
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break;
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}
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}
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} else if(self::hasValue(
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$existing->parent, $existing->property, $output)) {
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// existing embed's parent is an object
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$embed_on = true;
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}
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// existing embed has already been added, so allow an overwrite
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if($embed_on) {
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// if only the last match should be embedded
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if($flags['embed'] === '@last') {
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// remove any existing embed
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if(property_exists($state->uniqueEmbeds, $id)) {
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$this->_removeEmbed($state, $id);
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}
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$state->uniqueEmbeds->{$id} = array(
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'parent' => $parent, 'property' => $property);
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}
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// not embedding, add output without any other properties
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if(!$embed_on) {
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$this->_addFrameOutput($state, $parent, $property, $output);
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} else {
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// add embed meta info
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$state->embeds->{$id} = $embed;
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// push matching subject onto stack to enable circular embed checks
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$state->subjectStack[] = $subject;
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// iterate over subject properties
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$props = array_keys((array)$subject);
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sort($props);
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foreach($props as $prop) {
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// copy keywords to output
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if(self::_isKeyword($prop)) {
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$output->{$prop} = self::copy($subject->{$prop});
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continue;
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}
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// iterate over subject properties
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$props = array_keys((array)$subject);
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sort($props);
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foreach($props as $prop) {
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// copy keywords to output
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if(self::_isKeyword($prop)) {
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$output->{$prop} = self::copy($subject->{$prop});
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continue;
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}
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// if property isn't in the frame
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if(!property_exists($frame, $prop)) {
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// if explicit is off, embed values
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if(!$explicit_on) {
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$this->_embedValues($state, $subject, $prop, $output);
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}
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continue;
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}
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// explicit is on and property isn't in the frame, skip processing
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if($flags['explicit'] && !property_exists($frame, $prop)) {
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continue;
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}
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// add objects
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$objects = $subject->{$prop};
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foreach($objects as $o) {
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// recurse into list
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if(self::_isList($o)) {
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// add empty list
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$list = (object)array('@list' => array());
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$this->_addFrameOutput($state, $output, $prop, $list);
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// add objects
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$objects = $subject->{$prop};
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foreach($objects as $o) {
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// recurse into list
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if(self::_isList($o)) {
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// add empty list
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$list = (object)array('@list' => array());
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$this->_addFrameOutput($output, $prop, $list);
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// add list objects
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$src = $o->{'@list'};
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foreach($src as $o) {
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if(self::_isSubjectReference($o)) {
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// recurse into subject reference
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$this->_matchFrame(
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$state, array($o->{'@id'}), $frame->{$prop}[0]->{'@list'},
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$list, '@list');
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} else {
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// include other values automatically
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$this->_addFrameOutput(
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$state, $list, '@list', self::copy($o));
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}
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// add list objects
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$src = $o->{'@list'};
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foreach($src as $o) {
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if(self::_isSubjectReference($o)) {
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// recurse into subject reference
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$subframe = (property_exists($frame, $prop) ?
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$frame->{$prop}[0]->{'@list'} :
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$this->_createImplicitFrame($flags));
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$this->_matchFrame(
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$state, array($o->{'@id'}), $subframe, $list, '@list');
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} else {
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// include other values automatically
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$this->_addFrameOutput($list, '@list', self::copy($o));
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}
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continue;
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}
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if(self::_isSubjectReference($o)) {
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// recurse into subject reference
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$this->_matchFrame(
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$state, array($o->{'@id'}), $frame->{$prop}, $output, $prop);
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} else {
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// include other values automatically
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$this->_addFrameOutput($state, $output, $prop, self::copy($o));
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}
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}
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}
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// handle defaults
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$props = array_keys((array)$frame);
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sort($props);
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foreach($props as $prop) {
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// skip keywords
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if(self::_isKeyword($prop)) {
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continue;
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}
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// if omit default is off, then include default values for properties
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// that appear in the next frame but are not in the matching subject
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$next = $frame->{$prop}[0];
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$omit_default_on = $this->_getFrameFlag(
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$next, $options, 'omitDefault');
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if(!$omit_default_on && !property_exists($output, $prop)) {
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$preserve = '@null';
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if(property_exists($next, '@default')) {
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$preserve = self::copy($next->{'@default'});
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}
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$preserve = self::arrayify($preserve);
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$output->{$prop} = array((object)array('@preserve' => $preserve));
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if(self::_isSubjectReference($o)) {
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// recurse into subject reference
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$subframe = (property_exists($frame, $prop) ?
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$frame->{$prop} : $this->_createImplicitFrame($flags));
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$this->_matchFrame(
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$state, array($o->{'@id'}), $subframe, $output, $prop);
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} else {
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// include other values automatically
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$this->_addFrameOutput($output, $prop, self::copy($o));
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}
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}
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}
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// add output to parent
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$this->_addFrameOutput($state, $parent, $property, $output);
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// handle defaults
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$props = array_keys((array)$frame);
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sort($props);
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foreach($props as $prop) {
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// skip keywords
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if(self::_isKeyword($prop)) {
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continue;
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}
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// if omit default is off, then include default values for properties
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// that appear in the next frame but are not in the matching subject
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$next = $frame->{$prop}[0];
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$omit_default_on = $this->_getFrameFlag(
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$next, $options, 'omitDefault');
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if(!$omit_default_on && !property_exists($output, $prop)) {
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$preserve = '@null';
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if(property_exists($next, '@default')) {
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$preserve = self::copy($next->{'@default'});
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}
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$preserve = self::arrayify($preserve);
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$output->{$prop} = array((object)array('@preserve' => $preserve));
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}
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}
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// add output to parent
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$this->_addFrameOutput($parent, $property, $output);
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// pop matching subject from circular ref-checking stack
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array_pop($state->subjectStack);
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}
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}
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/**
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* Creates an implicit frame when recursing through subject matches. If
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* a frame doesn't have an explicit frame for a particular property, then
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* a wildcard child frame will be created that uses the same flags that the
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* parent frame used.
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*
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* @param assoc flags the current framing flags.
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*
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* @return array the implicit frame.
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*/
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function _createImplicitFrame($flags) {
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$frame = new stdClass();
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foreach($flags as $key => $value) {
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$frame->{'@' . $key} = array($flags[$key]);
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}
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return array($frame);
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}
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/**
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* Checks the current subject stack to see if embedding the given subject
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* would cause a circular reference.
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*
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* @param stdClass subject_to_embed the subject to embed.
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* @param assoc subject_stack the current stack of subjects.
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*
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* @return bool true if a circular reference would be created, false if not.
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*/
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function _createsCircularReference($subject_to_embed, $subject_stack) {
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for($i = count($subject_stack) - 1; $i >= 0; --$i) {
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if($subject_stack[$i]->{'@id'} === $subject_to_embed->{'@id'}) {
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return true;
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}
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}
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return false;
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}
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/**
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|
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@ -3863,17 +3960,31 @@ class JsonLdProcessor {
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*/
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protected function _getFrameFlag($frame, $options, $name) {
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$flag = "@$name";
|
||||
return (property_exists($frame, $flag) ?
|
||||
$rval = (property_exists($frame, $flag) ?
|
||||
$frame->{$flag}[0] : $options[$name]);
|
||||
if($name === 'embed') {
|
||||
// default is "@last"
|
||||
// backwards-compatibility support for "embed" maps:
|
||||
// true => "@last"
|
||||
// false => "@never"
|
||||
if($rval === true) {
|
||||
$rval = '@last';
|
||||
} else if($rval === false) {
|
||||
$rval = '@never';
|
||||
} else if($rval !== '@always' && $rval !== '@never' &&
|
||||
$rval !== '@link') {
|
||||
$rval = '@last';
|
||||
}
|
||||
}
|
||||
return $rval;
|
||||
}
|
||||
|
||||
/**
|
||||
* Validates a JSON-LD frame, throwing an exception if the frame is invalid.
|
||||
*
|
||||
* @param stdClass $state the current frame state.
|
||||
* @param array $frame the frame to validate.
|
||||
*/
|
||||
protected function _validateFrame($state, $frame) {
|
||||
protected function _validateFrame($frame) {
|
||||
if(!is_array($frame) || count($frame) !== 1 || !is_object($frame[0])) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; a JSON-LD frame must be a single object.',
|
||||
|
|
@ -3970,58 +4081,6 @@ class JsonLdProcessor {
|
|||
return $wildcard || $matches_some;
|
||||
}
|
||||
|
||||
/**
|
||||
* Embeds values for the given subject and property into the given output
|
||||
* during the framing algorithm.
|
||||
*
|
||||
* @param stdClass $state the current framing state.
|
||||
* @param stdClass $subject the subject.
|
||||
* @param string $property the property.
|
||||
* @param mixed $output the output.
|
||||
*/
|
||||
protected function _embedValues($state, $subject, $property, $output) {
|
||||
// embed subject properties in output
|
||||
$objects = $subject->{$property};
|
||||
foreach($objects as $o) {
|
||||
// recurse into @list
|
||||
if(self::_isList($o)) {
|
||||
$list = (object)array('@list' => new ArrayObject());
|
||||
$this->_addFrameOutput($state, $output, $property, $list);
|
||||
$this->_embedValues($state, $o, '@list', $list->{'@list'});
|
||||
$list->{'@list'} = (array)$list->{'@list'};
|
||||
return;
|
||||
}
|
||||
|
||||
// handle subject reference
|
||||
if(self::_isSubjectReference($o)) {
|
||||
$id = $o->{'@id'};
|
||||
|
||||
// embed full subject if isn't already embedded
|
||||
if(!property_exists($state->embeds, $id)) {
|
||||
// add embed
|
||||
$embed = (object)array('parent' => $output, 'property' => $property);
|
||||
$state->embeds->{$id} = $embed;
|
||||
|
||||
// recurse into subject
|
||||
$o = new stdClass();
|
||||
$s = $state->subjects->{$id};
|
||||
foreach($s as $prop => $v) {
|
||||
// copy keywords
|
||||
if(self::_isKeyword($prop)) {
|
||||
$o->{$prop} = self::copy($v);
|
||||
continue;
|
||||
}
|
||||
$this->_embedValues($state, $s, $prop, $o);
|
||||
}
|
||||
}
|
||||
$this->_addFrameOutput($state, $output, $property, $o);
|
||||
} else {
|
||||
// copy non-subject value
|
||||
$this->_addFrameOutput($state, $output, $property, self::copy($o));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes an existing embed.
|
||||
*
|
||||
|
|
@ -4030,7 +4089,7 @@ class JsonLdProcessor {
|
|||
*/
|
||||
protected function _removeEmbed($state, $id) {
|
||||
// get existing embed
|
||||
$embeds = $state->embeds;
|
||||
$embeds = $state->uniqueEmbeds;
|
||||
$embed = $embeds->{$id};
|
||||
$property = $embed->property;
|
||||
|
||||
|
|
@ -4074,12 +4133,11 @@ class JsonLdProcessor {
|
|||
/**
|
||||
* Adds framing output to the given parent.
|
||||
*
|
||||
* @param stdClass $state the current framing state.
|
||||
* @param mixed $parent the parent to add to.
|
||||
* @param string $property the parent property.
|
||||
* @param mixed $output the output to add.
|
||||
*/
|
||||
protected function _addFrameOutput($state, $parent, $property, $output) {
|
||||
protected function _addFrameOutput($parent, $property, $output) {
|
||||
if(is_object($parent) && !($parent instanceof ArrayObject)) {
|
||||
self::addValue(
|
||||
$parent, $property, $output, array('propertyIsArray' => true));
|
||||
|
|
@ -4130,6 +4188,25 @@ class JsonLdProcessor {
|
|||
return $input;
|
||||
}
|
||||
|
||||
// handle in-memory linked nodes
|
||||
$id_alias = $this->_compactIri($ctx, '@id');
|
||||
if(property_exists($input, $id_alias)) {
|
||||
$id = $input->{$id_alias};
|
||||
if(isset($options['link'][$id])) {
|
||||
$idx = array_search($input, $options['link'][$id]);
|
||||
if($idx === false) {
|
||||
// prevent circular visitation
|
||||
$options['link'][$id][] = $input;
|
||||
} else {
|
||||
// already visited
|
||||
return $options['link'][$id][$idx];
|
||||
}
|
||||
} else {
|
||||
// prevent circular visitation
|
||||
$options['link'][$id] = [$input];
|
||||
}
|
||||
}
|
||||
|
||||
// recurse through properties
|
||||
foreach($input as $prop => $v) {
|
||||
$result = $this->_removePreserve($ctx, $v, $options);
|
||||
|
|
|
|||
Loading…
Reference in a new issue