forked from friendica/php-json-ld
Cleaned up compact handling of disjoint graphs.
- Simplification of add/remove/etc context methods. - Removed default context.
This commit is contained in:
Dave Longley
parent
a2924c8d2d
commit
334cac4986
167
jsonld.php
167
jsonld.php
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@ -17,39 +17,6 @@ define('JSONLD_XSD_DOUBLE', JSONLD_XSD . 'double');
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define('JSONLD_XSD_INTEGER', JSONLD_XSD . 'integer');
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define('JSONLD_XSD_ANY_URI', JSONLD_XSD . 'anyURI');
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/**
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* Creates the JSON-LD default context.
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*
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* @return the JSON-LD default context.
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*/
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function jsonld_create_default_context()
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{
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return (object)array(
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'rdf' => JSONLD_RDF,
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'rdfs' => 'http://www.w3.org/2000/01/rdf-schema#',
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'owl' => 'http://www.w3.org/2002/07/owl#',
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'xsd' => 'http://www.w3.org/2001/XMLSchema#',
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'dcterms' => 'http://purl.org/dc/terms/',
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'foaf' => 'http://xmlns.com/foaf/0.1/',
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'cal' => 'http://www.w3.org/2002/12/cal/ical#',
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'vcard' => 'http://www.w3.org/2006/vcard/ns#',
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'geo' => 'http://www.w3.org/2003/01/geo/wgs84_pos#',
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'cc' => 'http://creativecommons.org/ns#',
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'sioc' => 'http://rdfs.org/sioc/ns#',
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'doap' => 'http://usefulinc.com/ns/doap#',
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'com' => 'http://purl.org/commerce#',
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'ps' => 'http://purl.org/payswarm#',
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'gr' => 'http://purl.org/goodrelations/v1#',
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'sig' => 'http://purl.org/signature#',
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'ccard' => 'http://purl.org/commerce/creditcard#',
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'@coerce' => (object)array(
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'xsd:anyURI' => array('foaf:homepage', 'foaf:member'),
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'xsd:integer' => 'foaf:age'
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),
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'@vocab' => ''
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);
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}
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/**
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* Normalizes a JSON-LD object.
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*
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@ -64,89 +31,81 @@ function jsonld_normalize($input)
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};
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/**
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* Removes the context from a JSON-LD object.
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* Removes the context from a JSON-LD object, expanding it to full-form.
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*
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* @param input the JSON-LD object to remove the context from.
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*
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* @return the context-neutral JSON-LD object.
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*/
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function jsonld_remove_context($input)
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function jsonld_expand($input)
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{
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$rval = null;
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if($input !== null)
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{
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$ctx = jsonld_create_default_context();
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$rval = _expand($ctx, null, $input, false);
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$rval = _expand(new stdClass(), null, $input, false);
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}
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return $rval;
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};
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function jsonld_expand($input)
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{
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return jsonld_remove_context($input);
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}
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/**
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* Adds the given context to the given context-neutral JSON-LD object.
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*
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* @param ctx the new context to use.
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* @param input the context-neutral JSON-LD object to add the context to.
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*
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* @return the JSON-LD object with the new context.
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*/
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function jsonld_add_context($ctx, $input)
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{
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$rval;
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// TODO: should context simplification be optional? (ie: remove context
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// entries that are not used in the output)
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$ctx = jsonld_merge_contexts(jsonld_create_default_context(), $ctx);
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// setup output context
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$ctxOut = new stdClass();
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// compact
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$rval = _compact($ctx, null, $input, $ctxOut);
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// add context if used
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if(count(array_keys((array)$ctxOut)) > 0)
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{
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// add copy of context to every entry in output array
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if(is_array($rval))
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{
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foreach($rval as $v)
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{
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$v->{'@context'} = _clone($ctxOut);
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}
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}
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else
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{
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$rval->{'@context'} = $ctxOut;
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}
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}
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return $rval;
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}
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/**
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* Changes the context of JSON-LD object "input" to "context", returning the
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* output.
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* Expands the given JSON-LD object and then compacts it using the
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* given context.
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*
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* @param ctx the new context to use.
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* @param input the input JSON-LD object.
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*
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* @return the output JSON-LD object.
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*/
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function jsonld_change_context($ctx, $input)
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{
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// remove context and then add new one
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return jsonld_add_context($ctx, jsonld_remove_context($input));
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}
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function jsonld_compact($ctx, $input)
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{
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return jsonld_change_context($ctx, $input);
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$rval = null;
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// TODO: should context simplification be optional? (ie: remove context
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// entries that are not used in the output)
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if($input !== null)
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{
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// fully expand input
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$input = jsonld_expand($input);
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if(is_array($input))
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{
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$rval = array();
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$tmp = $input;
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}
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else
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{
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$tmp = array($input);
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}
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foreach($tmp as $value)
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{
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// setup output context
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$ctxOut = new stdClass();
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// compact
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$out = _compact(_clone($ctx), null, $value, $ctxOut);
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// add context if used
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if(count(array_keys((array)$ctxOut)) > 0)
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{
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$out->{'@context'} = $ctxOut;
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}
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if($rval === null)
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{
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$rval = $out;
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}
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else
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{
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$rval[] = $out;
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}
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}
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}
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return $rval;
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}
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/**
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@ -333,12 +292,11 @@ function jsonld_frame($input, $frame, $options=null)
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$ctx = null;
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if(property_exists($frame, '@context'))
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{
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$ctx = jsonld_merge_contexts(
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jsonld_create_default_context(), $frame->{'@context'});
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$ctx = _clone($frame->{'@context'});
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}
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// remove context from frame
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$frame = jsonld_remove_context($frame);
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$frame = jsonld_expand($frame);
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// create framing options
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// TODO: merge in options from function parameter
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@ -361,7 +319,7 @@ function jsonld_frame($input, $frame, $options=null)
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// apply context
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if($ctx !== null and $rval !== null)
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{
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$rval = jsonld_add_context($ctx, $rval);
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$rval = jsonld_compact($ctx, $rval);
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}
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return $rval;
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@ -503,10 +461,14 @@ function _expandTerm($ctx, $term, $usedCtx)
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// 5. The property is a relative IRI, prepend the default vocab.
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else
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{
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$rval = $ctx->{'@vocab'} . $term;
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if($usedCtx !== null)
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$rval = $term;
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if(property_exists($ctx, '@vocab'))
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{
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$usedCtx->{'@vocab'} = $ctx->{'@vocab'};
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$rval = $ctx->{'@vocab'} . $rval;
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if($usedCtx !== null)
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{
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$usedCtx->{'@vocab'} = $ctx->{'@vocab'};
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}
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}
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}
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@ -600,7 +562,7 @@ function _getCoerceType($ctx, $property, $usedCtx)
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$rval = JSONLD_XSD_ANY_URI;
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}
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// check type coercion for property
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else
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else if(property_exists($ctx, '@coerce'))
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{
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// force compacted property
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$p = _compactIri($ctx, $p, null);
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@ -1593,11 +1555,8 @@ class JsonLdProcessor
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if($input !== null)
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{
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// get default context
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$ctx = jsonld_create_default_context();
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// expand input
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$expanded = _expand($ctx, null, $input, true);
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$expanded = _expand(new stdClass(), null, $input, true);
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// assign names to unnamed bnodes
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$this->nameBlankNodes($expanded);
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