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Support new document loader API.

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This commit is contained in:
Dave Longley 2013-07-15 12:30:28 -04:00
parent cf815ece8a
commit 8a0eb2150e
2 changed files with 215 additions and 103 deletions
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3
jsonld-tests.php
View file

@ -464,7 +464,8 @@ class TestRunner {
'@type' => 'earl:Assertion',
'earl:assertedBy' => $earl->{'doap:developer'}->{'@id'},
'earl:mode' => 'earl:automatic',
'earl:test' => $idBase . $test->{'@id'},
'earl:test' => $idBase . (property_exists($test, '@id') ?
$test->{'@id'} : ''),
'earl:result' => (object)array(
'@type' => 'earl:TestResult',
'dc:date' => gmdate(DateTime::ISO8601),

315
jsonld.php
View file

@ -1,7 +1,7 @@
<?php
/**
* PHP implementation of the JSON-LD API.
* Version: 0.0.37
* Version: 0.0.38
*
* @author Dave Longley
*
@ -43,9 +43,8 @@
* @param mixed $ctx the context to compact with.
* @param assoc [$options] options to use:
* [base] the base IRI to use.
* [strict] use strict mode (default: true).
* [graph] true to always output a top-level graph (default: false).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the compacted JSON-LD output.
*/
@ -60,7 +59,7 @@ function jsonld_compact($input, $ctx, $options=array()) {
* @param mixed $input the JSON-LD object to expand.
* @param assoc[$options] the options to use:
* [base] the base IRI to use.
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return array the expanded JSON-LD output.
*/
@ -77,7 +76,7 @@ function jsonld_expand($input, $options=array()) {
* null.
* @param [options] the options to use:
* [base] the base IRI to use.
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the flattened JSON-LD output.
*/
@ -96,7 +95,7 @@ function jsonld_flatten($input, $ctx, $options=array()) {
* [embed] default @embed flag (default: true).
* [explicit] default @explicit flag (default: false).
* [omitDefault] default @omitDefault flag (default: false).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return stdClass the framed JSON-LD output.
*/
@ -114,7 +113,7 @@ function jsonld_frame($input, $frame, $options=array()) {
* [base] the base IRI to use.
* [format] the format if output is a string:
* 'application/nquads' for N-Quads (default).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the normalized output.
*/
@ -151,7 +150,7 @@ function jsonld_from_rdf($input, $options=array()) {
* [base] the base IRI to use.
* [format] the format to use to output a string:
* 'application/nquads' for N-Quads (default).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the resulting RDF dataset (or a serialization of it).
*/
@ -177,18 +176,18 @@ $jsonld_cache = new stdClass();
/** The default active context cache. */
$jsonld_cache->activeCtx = new ActiveContextCache();
/** The default JSON-LD context loader. */
global $jsonld_default_load_context;
$jsonld_default_load_context = null;
/** Stores the default JSON-LD document loader. */
global $jsonld_default_load_document;
$jsonld_default_load_document = null;
/**
* Sets the default JSON-LD context loader.
* Sets the default JSON-LD document loader.
*
* @param callable load_context(url) the context loader.
* @param callable load_document(url) the document loader.
*/
function jsonld_set_context_loader($load_context) {
global $jsonld_default_load_context;
$jsonld_default_load_context = $load_context;
function jsonld_set_document_loader($load_document) {
global $jsonld_default_load_document;
$jsonld_default_load_document = $load_document;
}
/**
@ -199,13 +198,19 @@ function jsonld_set_context_loader($load_context) {
* @return the JSON-LD.
*/
function jsonld_get_url($url) {
global $jsonld_default_load_context;
if($jsonld_default_load_context !== null) {
return call_user_func($jsonld_default_load_context, $url);
global $jsonld_default_load_document;
if($jsonld_default_load_document !== null) {
$document_loader = $jsonld_default_load_document;
}
else {
$document_loader = $jsonld_default_document_loader;
}
// default JSON-LD GET implementation
return jsonld_default_get_url($url);
$remote_doc = $document_loader($url);
if($remote_doc) {
return $remote_doc->document;
}
return null;
}
/**
@ -213,28 +218,45 @@ function jsonld_get_url($url) {
*
* @param string $url the URL to to retrieve.
*
* @return the JSON-LD.
* @return stdClass the RemoteDocument object.
*/
function jsonld_default_get_url($url) {
// default JSON-LD GET implementation
function jsonld_default_document_loader($url) {
$redirects = array();
$opts = array(
'http' => array(
'method' => "GET",
'method' => 'GET',
'header' =>
"Accept: application/ld+json\r\n" .
"User-Agent: PaySwarm PHP Client/1.0\r\n"),
"User-Agent: JSON-LD PHP Client/1.0\r\n"),
'https' => array(
'verify_peer' => true,
'method' => "GET",
'method' => 'GET',
'header' =>
"Accept: application/ld+json\r\n" .
"User-Agent: PaySwarm PHP Client/1.0\r\n"));
"User-Agent: JSON-LD PHP Client/1.0\r\n"));
$stream = stream_context_create($opts);
stream_context_set_params($stream, array('notification' =>
function($notification_code, $severity, $message) use (&$redirects) {
switch($notification_code) {
case STREAM_NOTIFY_REDIRECTED:
$redirects[] = $message;
break;
};
}));
$result = @file_get_contents($url, false, $stream);
if($result === false) {
throw new Exception("Could not GET url: '$url'");
}
return $result;
$redirs = count($redirects);
if($redirs > 0) {
$url = $redirects[$redirs - 1];
}
// return RemoteDocument
return (object)array(
'contextUrl' => null,
'document' => $result,
'documentUrl' => $url);
}
/**
@ -242,9 +264,9 @@ function jsonld_default_get_url($url) {
*
* @param string $url the secure URL to to retrieve.
*
* @return the JSON-LD.
* @return stdClass the RemoteDocument object.
*/
function jsonld_default_get_secure_url($url) {
function jsonld_default_secure_document_loader($url) {
if(strpos($url, 'https') !== 0) {
throw new Exception("Could not GET url: '$url'; 'https' is required.");
}
@ -258,7 +280,7 @@ function jsonld_default_get_secure_url($url) {
'method' => "GET",
'header' =>
"Accept: application/ld+json\r\n" .
"User-Agent: PaySwarm PHP Client/1.0\r\n"));
"User-Agent: JSON-LD PHP Client/1.0\r\n"));
$stream = stream_context_create($opts);
stream_context_set_params($stream, array('notification' =>
function($notification_code, $severity, $message) use (&$redirects) {
@ -277,8 +299,13 @@ function jsonld_default_get_secure_url($url) {
throw new Exception(
"Could not GET redirected url: '$redirect'; 'https' is required.");
}
$url = $redirect;
}
return $result;
// return RemoteDocument
return (object)array(
'contextUrl' => null,
'document' => $result,
'documentUrl' => $url);
}
/** Registered global RDF dataset parsers hashed by content-type. */
@ -292,7 +319,7 @@ $jsonld_rdf_parsers = new stdClass();
*
* @param string $content_type the content-type for the parser.
* @param callable $parser(input) the parser function (takes a string as
* a parameter and returns an RDF dataset).
* a parameter and returns an RDF dataset).
*/
function jsonld_register_rdf_parser($content_type, $parser) {
global $jsonld_rdf_parsers;
@ -606,14 +633,13 @@ class JsonLdProcessor {
* @param mixed $ctx the context to compact with.
* @param assoc $options the compaction options.
* [base] the base IRI to use.
* [strict] use strict mode (default: true).
* [compactArrays] true to compact arrays to single values when
* appropriate, false not to (default: true).
* [graph] true to always output a top-level graph (default: false).
* [skipExpansion] true to assume the input is expanded and skip
* expansion, false not to, defaults to false.
* [activeCtx] true to also return the active context used.
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the compacted JSON-LD output.
*/
@ -629,15 +655,13 @@ class JsonLdProcessor {
return null;
}
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['strict']) or $options['strict'] = true;
isset($options['compactArrays']) or $options['compactArrays'] = true;
isset($options['graph']) or $options['graph'] = false;
isset($options['skipExpansion']) or $options['skipExpansion'] = false;
isset($options['activeCtx']) or $options['activeCtx'] = false;
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'compactArrays' => true,
'graph' => false,
'skipExpansion' => false,
'activeCtx' => false,
'loadDocument' => 'jsonld_default_document_loader'));
if($options['skipExpansion'] === true) {
$expanded = $input;
@ -743,25 +767,40 @@ class JsonLdProcessor {
* @param mixed $input the JSON-LD object to expand.
* @param assoc $options the options to use:
* [base] the base IRI to use.
* [expandContext] a context to expand with.
* [keepFreeFloatingNodes] true to keep free-floating nodes,
* false not to, defaults to false.
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return array the expanded JSON-LD output.
*/
public function expand($input, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['keepFreeFloatingNodes']) or
$options['keepFreeFloatingNodes'] = false;
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'keepFreeFloatingNodes' => false,
'loadDocument' => 'jsonld_default_document_loader'));
// if input is a string, attempt to dereference remote document
if(is_string($input)) {
$remote_doc = $options['loadDocument']($input);
}
else {
$remote_doc = (object)array(
'contextUrl' => null,
'documentUrl' => null,
'document' => $input);
}
// build meta-object and retrieve all @context urls
$input = (object)array(
'document' => self::copy($input),
'remoteContext' => (object)array(
'@context' => $remote_doc->contextUrl));
// retrieve all @context URLs in the input
$input = self::copy($input);
try {
$this->_retrieveContextUrls(
$input, new stdClass(), $options['loadContext'], $options['base']);
$input, new stdClass(), $options['loadDocument'], $options['base']);
}
catch(Exception $e) {
throw new JsonLdException(
@ -769,9 +808,22 @@ class JsonLdProcessor {
'jsonld.ExpandError', null, $e);
}
// do expansion
$active_ctx = $this->_getInitialContext($options);
$expanded = $this->_expand($active_ctx, null, $input, $options, false);
$document = $input->document;
$remote_context = $input->remoteContext->{'@context'};
// process optional expandContext
if(isset($options['expandContext'])) {
self::_processContext($active_ctx, $options->expandContext, $options);
}
// process remote context from HTTP Link Header
if($remote_context) {
self::_processContext($active_ctx, $remote_context, $options);
}
// do expansion
$expanded = $this->_expand($active_ctx, null, $document, $options, false);
// optimize away @graph with no other properties
if(is_object($expanded) && property_exists($expanded, '@graph') &&
@ -792,15 +844,15 @@ class JsonLdProcessor {
* @param ctx the context to use to compact the flattened output, or null.
* @param assoc $options the options to use:
* [base] the base IRI to use.
* [loadContext(url)] the context loader.
* [expandContext] a context to expand with.
* [loadDocument(url)] the document loader.
*
* @return array the flattened output.
*/
public function flatten($input, $ctx, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'loadDocument' => 'jsonld_default_document_loader'));
try {
// expand input
@ -841,26 +893,50 @@ class JsonLdProcessor {
* @param stdClass $frame the JSON-LD frame to use.
* @param $options the framing options.
* [base] the base IRI to use.
* [expandContext] a context to expand with.
* [embed] default @embed flag (default: true).
* [explicit] default @explicit flag (default: false).
* [omitDefault] default @omitDefault flag (default: false).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return stdClass the framed JSON-LD output.
*/
public function frame($input, $frame, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['compactArrays']) or $options['compactArrays'] = true;
isset($options['embed']) or $options['embed'] = true;
isset($options['explicit']) or $options['explicit'] = false;
isset($options['omitDefault']) or $options['omitDefault'] = false;
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'compactArrays' => true,
'embed' => true,
'explicit' => false,
'omitDefault' => false,
'loadDocument' => 'jsonld_default_document_loader'));
// if frame is a string, attempt to dereference remote document
if(is_string($frame)) {
$remote_frame = $options['loadDocument']($frame);
}
else {
$remote_frame = (object)array(
'contextUrl' => null,
'documentUrl' => null,
'document' => $frame);
}
// preserve frame context
$ctx = (property_exists($frame, '@context') ?
$frame->{'@context'} : new stdClass());
$frame = $remote_frame->document;
if($frame !== null) {
$ctx = (property_exists($frame, '@context') ?
$frame->{'@context'} : new stdClass());
if($remote_frame->contextUrl !== null) {
if($ctx !== null) {
$ctx = $remote_frame->contextUrl;
}
else {
$ctx = self::arrayify($ctx);
$ctx[] = $remote_frame->contextUrl;
}
$frame->{'@context'} = $ctx;
}
}
try {
// expand input
@ -917,17 +993,17 @@ class JsonLdProcessor {
* @param mixed $input the JSON-LD object to normalize.
* @param assoc $options the options to use:
* [base] the base IRI to use.
* [expandContext] a context to expand with.
* [format] the format if output is a string:
* 'application/nquads' for N-Quads.
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the normalized output.
*/
public function normalize($input, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'loadDocument' => 'jsonld_default_document_loader'));
try {
// convert to RDF dataset then do normalization
@ -965,9 +1041,9 @@ class JsonLdProcessor {
public function fromRDF($dataset, $options) {
global $jsonld_rdf_parsers;
// set default options
isset($options['useRdfType']) or $options['useRdfType'] = false;
isset($options['useNativeTypes']) or $options['useNativeTypes'] = false;
self::setdefaults($options, array(
'useRdfType' => false,
'useNativeTypes' => false));
if(!isset($options['format']) && is_string($dataset)) {
// set default format to nquads
@ -991,7 +1067,7 @@ class JsonLdProcessor {
else {
$callable = $jsonld_rdf_parsers->{$options['format']};
}
$dataset = call_user_func($callable, $dataset);
$dataset = $callable($dataset);
}
// convert from RDF
@ -1004,17 +1080,17 @@ class JsonLdProcessor {
* @param mixed $input the JSON-LD object.
* @param assoc $options the options to use:
* [base] the base IRI to use.
* [expandContext] a context to expand with.
* [format] the format to use to output a string:
* 'application/nquads' for N-Quads (default).
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return mixed the resulting RDF dataset (or a serialization of it).
*/
public function toRDF($input, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'base' => is_string($input) ? $input : '',
'loadDocument' => 'jsonld_default_document_loader'));
try {
// expand input
@ -1065,15 +1141,13 @@ class JsonLdProcessor {
* @param stdClass $active_ctx the current active context.
* @param mixed $local_ctx the local context to process.
* @param assoc $options the options to use:
* [loadContext(url)] the context loader.
* [loadDocument(url)] the document loader.
*
* @return stdClass the new active context.
*/
public function processContext($active_ctx, $local_ctx, $options) {
// set default options
isset($options['base']) or $options['base'] = '';
isset($options['loadContext']) or $options['loadContext'] =
'jsonld_get_url';
self::setdefaults($options, array(
'loadDocument' => 'jsonld_default_document_loader'));
// return initial context early for null context
if($local_ctx === null) {
@ -1088,7 +1162,7 @@ class JsonLdProcessor {
}
try {
$this->_retrieveContextUrls(
$local_ctx, new stdClass(), $options['loadContext'], $options['base']);
$local_ctx, new stdClass(), $options['loadDocument'], $options['base']);
}
catch(Exception $e) {
throw new JsonLdException(
@ -1170,8 +1244,9 @@ class JsonLdProcessor {
*/
public static function addValue(
$subject, $property, $value, $options=array()) {
isset($options['allowDuplicate']) or $options['allowDuplicate'] = true;
isset($options['propertyIsArray']) or $options['propertyIsArray'] = false;
self::setdefaults($options, array(
'allowDuplicate' => true,
'propertyIsArray' => false));
if(is_array($value)) {
if(count($value) === 0 && $options['propertyIsArray'] &&
@ -1241,7 +1316,8 @@ class JsonLdProcessor {
*/
public static function removeValue(
$subject, $property, $value, $options=array()) {
isset($options['propertyIsArray']) or $options['propertyIsArray'] = false;
self::setdefaults($options, array(
'propertyIsArray' => false));
// filter out value
$filter = function($e) use ($value) {
@ -1646,6 +1722,30 @@ class JsonLdProcessor {
}
}
/**
* Sets the value of a key for the given array if that property
* has not already been set.
*
* @param &assoc $arr the object to update.
* @param string $key the key to update.
* @param mixed $value the value to set.
*/
public static function setdefault(&$arr, $key, $value) {
isset($arr[$key]) or $arr[$key] = $value;
}
/**
* Sets default values for keys in the given array.
*
* @param &assoc $arr the object to update.
* @param assoc $defaults the default keys and values.
*/
public static function setdefaults(&$arr, $defaults) {
foreach($defaults as $key => $value) {
self::setdefault($arr, $key, $value);
}
}
/**
* Recursively compacts an element using the given active context. All values
* must be in expanded form before this method is called.
@ -4221,7 +4321,8 @@ class JsonLdProcessor {
// determine if vocab is a prefix of the iri
$vocab = $active_ctx->{'@vocab'};
if(strpos($iri, $vocab) === 0 && $iri !== $vocab) {
// use suffix as relative iri if it is not a term in the active context
// use suffix as relative iri if it is not a term in the active
// context
$suffix = substr($iri, strlen($vocab));
if(!property_exists($active_ctx->mappings, $suffix)) {
return $suffix;
@ -4741,19 +4842,19 @@ class JsonLdProcessor {
}
/**
* Retrieves external @context URLs using the given context loader. Each
* Retrieves external @context URLs using the given document loader. Each
* instance of @context in the input that refers to a URL will be replaced
* with the JSON @context found at that URL.
*
* @param mixed $input the JSON-LD input with possible contexts.
* @param stdClass $cycles an object for tracking context cycles.
* @param callable $load_context(url) the context loader.
* @param callable $load_document(url) the document loader.
* @param base $base the base URL to resolve relative URLs against.
*
* @return mixed the result.
*/
protected function _retrieveContextUrls(
&$input, $cycles, $load_context, $base='') {
&$input, $cycles, $load_document, $base='') {
if(count(get_object_vars($cycles)) > self::MAX_CONTEXT_URLS) {
throw new JsonLdException(
'Maximum number of @context URLs exceeded.',
@ -4786,7 +4887,8 @@ class JsonLdProcessor {
$_cycles->{$url} = true;
// retrieve URL
$ctx = $load_context($url);
$remote_doc = $load_document($url);
$ctx = $remote_doc->document;
// parse string context as JSON
if(is_string($ctx)) {
@ -4829,9 +4931,18 @@ class JsonLdProcessor {
if(!property_exists($ctx, '@context')) {
$ctx = (object)array('@context' => new stdClass());
}
else {
$ctx = (object)array('@context' => $ctx->{'@context'});
}
// append context URL to context if given
if($remote_doc->contextUrl !== null) {
$ctx->{'@context'} = self::arrayify($ctx->{'@context'});
$ctx->{'@context'}[] = $remote_doc->contextUrl;
}
// recurse
$this->_retrieveContextUrls($ctx, $_cycles, $load_context, $url);
$this->_retrieveContextUrls($ctx, $_cycles, $load_document, $url);
$urls->{$url} = $ctx->{'@context'};
}
@ -5202,7 +5313,7 @@ class JsonLdProcessor {
// register the N-Quads RDF parser
jsonld_register_rdf_parser(
'application/nquads', 'JsonLdProcessor::parseNQuads');
'application/nquads', array('JsonLdProcessor', 'parseNQuads'));
/**
* A JSON-LD Exception.