forked from friendica/php-json-ld
Handle scalars before objects.
This commit is contained in:
Dave Longley
parent
d1501c7c08
commit
12a9ccc9e8
601
jsonld.php
601
jsonld.php
|
|
@ -2102,351 +2102,352 @@ class JsonLdProcessor {
|
|||
return $rval;
|
||||
}
|
||||
|
||||
// recursively expand object
|
||||
if(is_object($element)) {
|
||||
// if element has a context, process it
|
||||
if(property_exists($element, '@context')) {
|
||||
$active_ctx = $this->_processContext(
|
||||
$active_ctx, $element->{'@context'}, $options);
|
||||
if(!is_object($element)) {
|
||||
// drop top-level scalars that are not in lists
|
||||
if(!$inside_list &&
|
||||
($active_property === null ||
|
||||
$this->_expandIri($active_ctx, $active_property,
|
||||
array('vocab' => true)) === '@graph')) {
|
||||
return null;
|
||||
}
|
||||
|
||||
// expand the active property
|
||||
$expanded_active_property = $this->_expandIri(
|
||||
$active_ctx, $active_property, array('vocab' => true));
|
||||
// expand element according to value expansion rules
|
||||
return $this->_expandValue($active_ctx, $active_property, $element);
|
||||
}
|
||||
|
||||
$rval = new stdClass();
|
||||
$keys = array_keys((array)$element);
|
||||
sort($keys);
|
||||
foreach($keys as $key) {
|
||||
$value = $element->{$key};
|
||||
// recursively expand object:
|
||||
|
||||
if($key === '@context') {
|
||||
continue;
|
||||
}
|
||||
// if element has a context, process it
|
||||
if(property_exists($element, '@context')) {
|
||||
$active_ctx = $this->_processContext(
|
||||
$active_ctx, $element->{'@context'}, $options);
|
||||
}
|
||||
|
||||
// get term definition for key
|
||||
if(property_exists($active_ctx->mappings, $key)) {
|
||||
$mapping = $active_ctx->mappings->{$key};
|
||||
}
|
||||
else {
|
||||
$mapping = null;
|
||||
}
|
||||
// expand the active property
|
||||
$expanded_active_property = $this->_expandIri(
|
||||
$active_ctx, $active_property, array('vocab' => true));
|
||||
|
||||
// expand key to IRI
|
||||
$expanded_property = $this->_expandIri(
|
||||
$active_ctx, $key, array('vocab' => true));
|
||||
$rval = new stdClass();
|
||||
$keys = array_keys((array)$element);
|
||||
sort($keys);
|
||||
foreach($keys as $key) {
|
||||
$value = $element->{$key};
|
||||
|
||||
// drop non-absolute IRI keys that aren't keywords
|
||||
if($expanded_property === null ||
|
||||
!(self::_isAbsoluteIri($expanded_property) ||
|
||||
self::_isKeyword($expanded_property))) {
|
||||
continue;
|
||||
}
|
||||
if($key === '@context') {
|
||||
continue;
|
||||
}
|
||||
|
||||
if(self::_isKeyword($expanded_property) &&
|
||||
$expanded_active_property === '@reverse') {
|
||||
// get term definition for key
|
||||
if(property_exists($active_ctx->mappings, $key)) {
|
||||
$mapping = $active_ctx->mappings->{$key};
|
||||
}
|
||||
else {
|
||||
$mapping = null;
|
||||
}
|
||||
|
||||
// expand key to IRI
|
||||
$expanded_property = $this->_expandIri(
|
||||
$active_ctx, $key, array('vocab' => true));
|
||||
|
||||
// drop non-absolute IRI keys that aren't keywords
|
||||
if($expanded_property === null ||
|
||||
!(self::_isAbsoluteIri($expanded_property) ||
|
||||
self::_isKeyword($expanded_property))) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if(self::_isKeyword($expanded_property) &&
|
||||
$expanded_active_property === '@reverse') {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; a keyword cannot be used as a @reverse ' .
|
||||
'property.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// syntax error if @id is not a string
|
||||
if($expanded_property === '@id' && !is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@id" value must a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// validate @type value
|
||||
if($expanded_property === '@type') {
|
||||
$this->_validateTypeValue($value);
|
||||
}
|
||||
|
||||
// @graph must be an array or an object
|
||||
if($expanded_property === '@graph' &&
|
||||
!(is_object($value) || is_array($value))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@value" value must not be an ' .
|
||||
'object or an array.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// @value must not be an object or an array
|
||||
if($expanded_property === '@value' &&
|
||||
(is_object($value) || is_array($value))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@value" value must not be an ' .
|
||||
'object or an array.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// @language must be a string
|
||||
if($expanded_property === '@language' && !is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@language" value must not be a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
// ensure language value is lowercase
|
||||
$value = strtolower($value);
|
||||
}
|
||||
|
||||
// @index must be a string
|
||||
if($expanded_property === '@index') {
|
||||
if(!is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; a keyword cannot be used as a @reverse ' .
|
||||
'property.',
|
||||
'Invalid JSON-LD syntax; "@index" value must be a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
}
|
||||
|
||||
// @reverse must be an object
|
||||
if($expanded_property === '@reverse') {
|
||||
if(!is_object($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@reverse" value must be an object.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// syntax error if @id is not a string
|
||||
if($expanded_property === '@id' && !is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@id" value must a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, '@reverse', $value, $options, $inside_list);
|
||||
|
||||
// validate @type value
|
||||
if($expanded_property === '@type') {
|
||||
$this->_validateTypeValue($value);
|
||||
}
|
||||
|
||||
// @graph must be an array or an object
|
||||
if($expanded_property === '@graph' &&
|
||||
!(is_object($value) || is_array($value))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@value" value must not be an ' .
|
||||
'object or an array.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// @value must not be an object or an array
|
||||
if($expanded_property === '@value' &&
|
||||
(is_object($value) || is_array($value))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@value" value must not be an ' .
|
||||
'object or an array.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
// @language must be a string
|
||||
if($expanded_property === '@language' && !is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@language" value must not be a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
// ensure language value is lowercase
|
||||
$value = strtolower($value);
|
||||
}
|
||||
|
||||
// @index must be a string
|
||||
if($expanded_property === '@index') {
|
||||
if(!is_string($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@index" value must be a string.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
}
|
||||
|
||||
// @reverse must be an object
|
||||
if($expanded_property === '@reverse') {
|
||||
if(!is_object($value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@reverse" value must be an object.',
|
||||
'jsonld.SyntaxError', array('value' => $value));
|
||||
}
|
||||
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, '@reverse', $value, $options, $inside_list);
|
||||
|
||||
// properties double-reversed
|
||||
if(property_exists($expanded_value, '@reverse')) {
|
||||
foreach($expanded_value->{'@reverse'} as $rproperty => $rvalue) {
|
||||
self::addValue(
|
||||
$rval, $rproperty, $rvalue, array('propertyIsArray' => true));
|
||||
}
|
||||
}
|
||||
|
||||
// FIXME: can this be merged with code below to simplify?
|
||||
// merge in all reversed properties
|
||||
if(property_exists($rval, '@reverse')) {
|
||||
$reverse_map = $rval->{'@reverse'};
|
||||
}
|
||||
else {
|
||||
$reverse_map = null;
|
||||
}
|
||||
foreach($expanded_value as $property => $items) {
|
||||
if($property === '@reverse') {
|
||||
continue;
|
||||
}
|
||||
if($reverse_map === null) {
|
||||
$reverse_map = $rval->{'@reverse'} = new stdClass();
|
||||
}
|
||||
// properties double-reversed
|
||||
if(property_exists($expanded_value, '@reverse')) {
|
||||
foreach($expanded_value->{'@reverse'} as $rproperty => $rvalue) {
|
||||
self::addValue(
|
||||
$reverse_map, $property, array(),
|
||||
array('propertyIsArray' => true));
|
||||
foreach($items as $item) {
|
||||
if(self::_isValue($item) || self::_isList($item)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@reverse" value must not be a ' +
|
||||
'@value or an @list.',
|
||||
'jsonld.SyntaxError',
|
||||
array('value' => $expanded_value));
|
||||
}
|
||||
self::addValue(
|
||||
$reverse_map, $property, $item,
|
||||
array('propertyIsArray' => true));
|
||||
}
|
||||
$rval, $rproperty, $rvalue, array('propertyIsArray' => true));
|
||||
}
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
$container = self::getContextValue($active_ctx, $key, '@container');
|
||||
|
||||
// handle language map container (skip if value is not an object)
|
||||
if($container === '@language' && is_object($value)) {
|
||||
$expanded_value = $this->_expandLanguageMap($value);
|
||||
}
|
||||
// handle index container (skip if value is not an object)
|
||||
else if($container === '@index' && is_object($value)) {
|
||||
$expanded_value = array();
|
||||
$value_keys = array_keys((array)$value);
|
||||
sort($value_keys);
|
||||
foreach($value_keys as $value_key) {
|
||||
$val = $value->{$value_key};
|
||||
$val = self::arrayify($val);
|
||||
$val = $this->_expand($active_ctx, $key, $val, $options, false);
|
||||
foreach($val as $item) {
|
||||
if(!property_exists($item, '@index')) {
|
||||
$item->{'@index'} = $value_key;
|
||||
}
|
||||
$expanded_value[] = $item;
|
||||
}
|
||||
}
|
||||
// FIXME: can this be merged with code below to simplify?
|
||||
// merge in all reversed properties
|
||||
if(property_exists($rval, '@reverse')) {
|
||||
$reverse_map = $rval->{'@reverse'};
|
||||
}
|
||||
else {
|
||||
// recurse into @list or @set keeping the active property
|
||||
$is_list = ($expanded_property === '@list');
|
||||
if($is_list || $expanded_property === '@set') {
|
||||
$next_active_property = $active_property;
|
||||
if($is_list && $expanded_active_property === '@graph') {
|
||||
$next_active_property = null;
|
||||
}
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, $next_active_property, $value, $options, $is_list);
|
||||
if($is_list && self::_isList($expanded_value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; lists of lists are not permitted.',
|
||||
'jsonld.SyntaxError');
|
||||
}
|
||||
$reverse_map = null;
|
||||
}
|
||||
foreach($expanded_value as $property => $items) {
|
||||
if($property === '@reverse') {
|
||||
continue;
|
||||
}
|
||||
else {
|
||||
// recursively expand value with key as new active property
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, $key, $value, $options, false);
|
||||
if($reverse_map === null) {
|
||||
$reverse_map = $rval->{'@reverse'} = new stdClass();
|
||||
}
|
||||
}
|
||||
|
||||
// drop null values if property is not @value
|
||||
if($expanded_value === null && $expanded_property !== '@value') {
|
||||
continue;
|
||||
}
|
||||
|
||||
// convert expanded value to @list if container specifies it
|
||||
if($expanded_property !== '@list' && !self::_isList($expanded_value) &&
|
||||
$container === '@list') {
|
||||
// ensure expanded value is an array
|
||||
$expanded_value = (object)array(
|
||||
'@list' => self::arrayify($expanded_value));
|
||||
}
|
||||
|
||||
// FIXME: can this be merged with code above to simplify?
|
||||
// merge in reverse properties
|
||||
if(property_exists($active_ctx->mappings, $key) &&
|
||||
$active_ctx->mappings->{$key} &&
|
||||
$active_ctx->mappings->{$key}->reverse) {
|
||||
$reverse_map = $rval->{'@reverse'} = new stdClass();
|
||||
$expanded_value = self::arrayify($expanded_value);
|
||||
foreach($expanded_value as $item) {
|
||||
self::addValue(
|
||||
$reverse_map, $property, array(),
|
||||
array('propertyIsArray' => true));
|
||||
foreach($items as $item) {
|
||||
if(self::_isValue($item) || self::_isList($item)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@reverse" value must not be a ' +
|
||||
'@value or an @list.',
|
||||
'jsonld.SyntaxError', array('value' => $expanded_value));
|
||||
'jsonld.SyntaxError',
|
||||
array('value' => $expanded_value));
|
||||
}
|
||||
self::addValue(
|
||||
$reverse_map, $expanded_property, $item,
|
||||
$reverse_map, $property, $item,
|
||||
array('propertyIsArray' => true));
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// add value for property
|
||||
// use an array except for certain keywords
|
||||
$use_array = (!in_array(
|
||||
$expanded_property, array(
|
||||
'@index', '@id', '@type', '@value', '@language')));
|
||||
self::addValue(
|
||||
$rval, $expanded_property, $expanded_value,
|
||||
array('propertyIsArray' => $use_array));
|
||||
continue;
|
||||
}
|
||||
|
||||
// get property count on expanded output
|
||||
$keys = array_keys((array)$rval);
|
||||
$count = count($keys);
|
||||
$container = self::getContextValue($active_ctx, $key, '@container');
|
||||
|
||||
// @value must only have @language or @type
|
||||
if(property_exists($rval, '@value')) {
|
||||
// @value must only have @language or @type
|
||||
if(property_exists($rval, '@type') &&
|
||||
property_exists($rval, '@language')) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; an element containing "@value" may not ' .
|
||||
'contain both "@type" and "@language".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
$valid_count = $count - 1;
|
||||
if(property_exists($rval, '@type')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if(property_exists($rval, '@index')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if(property_exists($rval, '@language')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if($valid_count !== 0) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; an element containing "@value" may only ' .
|
||||
'have an "@index" property and at most one other property ' .
|
||||
'which can be "@type" or "@language".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
// drop null @values
|
||||
if($rval->{'@value'} === null) {
|
||||
$rval = null;
|
||||
}
|
||||
// drop @language if @value isn't a string
|
||||
else if(property_exists($rval, '@language') &&
|
||||
!is_string($rval->{'@value'})) {
|
||||
unset($rval->{'@language'});
|
||||
// handle language map container (skip if value is not an object)
|
||||
if($container === '@language' && is_object($value)) {
|
||||
$expanded_value = $this->_expandLanguageMap($value);
|
||||
}
|
||||
// handle index container (skip if value is not an object)
|
||||
else if($container === '@index' && is_object($value)) {
|
||||
$expanded_value = array();
|
||||
$value_keys = array_keys((array)$value);
|
||||
sort($value_keys);
|
||||
foreach($value_keys as $value_key) {
|
||||
$val = $value->{$value_key};
|
||||
$val = self::arrayify($val);
|
||||
$val = $this->_expand($active_ctx, $key, $val, $options, false);
|
||||
foreach($val as $item) {
|
||||
if(!property_exists($item, '@index')) {
|
||||
$item->{'@index'} = $value_key;
|
||||
}
|
||||
$expanded_value[] = $item;
|
||||
}
|
||||
}
|
||||
}
|
||||
// convert @type to an array
|
||||
else if(property_exists($rval, '@type') && !is_array($rval->{'@type'})) {
|
||||
$rval->{'@type'} = array($rval->{'@type'});
|
||||
}
|
||||
// handle @set and @list
|
||||
else if(property_exists($rval, '@set') ||
|
||||
property_exists($rval, '@list')) {
|
||||
if($count > 1 && ($count !== 2 && property_exists($rval, '@index'))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; if an element has the property "@set" ' .
|
||||
'or "@list", then it can have at most one other property that is ' .
|
||||
'"@index".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
// optimize away @set
|
||||
if(property_exists($rval, '@set')) {
|
||||
$rval = $rval->{'@set'};
|
||||
$keys = array_keys((array)$rval);
|
||||
$count = count($keys);
|
||||
}
|
||||
}
|
||||
// drop objects with only @language
|
||||
else if($count === 1 && property_exists($rval, '@language')) {
|
||||
$rval = null;
|
||||
}
|
||||
|
||||
// drop certain top-level objects that do not occur in lists
|
||||
if(is_object($rval) &&
|
||||
!$options['keepFreeFloatingNodes'] && !$inside_list &&
|
||||
($active_property === null || $expanded_active_property === '@graph')) {
|
||||
// drop empty object or top-level @value
|
||||
if($count === 0 || property_exists($rval, '@value')) {
|
||||
$rval = null;
|
||||
else {
|
||||
// recurse into @list or @set keeping the active property
|
||||
$is_list = ($expanded_property === '@list');
|
||||
if($is_list || $expanded_property === '@set') {
|
||||
$next_active_property = $active_property;
|
||||
if($is_list && $expanded_active_property === '@graph') {
|
||||
$next_active_property = null;
|
||||
}
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, $next_active_property, $value, $options, $is_list);
|
||||
if($is_list && self::_isList($expanded_value)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; lists of lists are not permitted.',
|
||||
'jsonld.SyntaxError');
|
||||
}
|
||||
}
|
||||
else {
|
||||
// drop subjects that generate no triples
|
||||
$has_triples = false;
|
||||
$ignore = array('@graph', '@type');
|
||||
foreach($keys as $key) {
|
||||
if(!self::_isKeyword($key) || in_array($key, $ignore)) {
|
||||
$has_triples = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(!$has_triples) {
|
||||
$rval = null;
|
||||
}
|
||||
// recursively expand value with key as new active property
|
||||
$expanded_value = $this->_expand(
|
||||
$active_ctx, $key, $value, $options, false);
|
||||
}
|
||||
}
|
||||
|
||||
return $rval;
|
||||
// drop null values if property is not @value
|
||||
if($expanded_value === null && $expanded_property !== '@value') {
|
||||
continue;
|
||||
}
|
||||
|
||||
// convert expanded value to @list if container specifies it
|
||||
if($expanded_property !== '@list' && !self::_isList($expanded_value) &&
|
||||
$container === '@list') {
|
||||
// ensure expanded value is an array
|
||||
$expanded_value = (object)array(
|
||||
'@list' => self::arrayify($expanded_value));
|
||||
}
|
||||
|
||||
// FIXME: can this be merged with code above to simplify?
|
||||
// merge in reverse properties
|
||||
if(property_exists($active_ctx->mappings, $key) &&
|
||||
$active_ctx->mappings->{$key} &&
|
||||
$active_ctx->mappings->{$key}->reverse) {
|
||||
$reverse_map = $rval->{'@reverse'} = new stdClass();
|
||||
$expanded_value = self::arrayify($expanded_value);
|
||||
foreach($expanded_value as $item) {
|
||||
if(self::_isValue($item) || self::_isList($item)) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; "@reverse" value must not be a ' +
|
||||
'@value or an @list.',
|
||||
'jsonld.SyntaxError', array('value' => $expanded_value));
|
||||
}
|
||||
self::addValue(
|
||||
$reverse_map, $expanded_property, $item,
|
||||
array('propertyIsArray' => true));
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
// add value for property
|
||||
// use an array except for certain keywords
|
||||
$use_array = (!in_array(
|
||||
$expanded_property, array(
|
||||
'@index', '@id', '@type', '@value', '@language')));
|
||||
self::addValue(
|
||||
$rval, $expanded_property, $expanded_value,
|
||||
array('propertyIsArray' => $use_array));
|
||||
}
|
||||
|
||||
// drop top-level scalars that are not in lists
|
||||
if(!$inside_list &&
|
||||
($active_property === null ||
|
||||
$this->_expandIri($active_ctx, $active_property,
|
||||
array('vocab' => true)) === '@graph')) {
|
||||
return null;
|
||||
// get property count on expanded output
|
||||
$keys = array_keys((array)$rval);
|
||||
$count = count($keys);
|
||||
|
||||
// @value must only have @language or @type
|
||||
if(property_exists($rval, '@value')) {
|
||||
// @value must only have @language or @type
|
||||
if(property_exists($rval, '@type') &&
|
||||
property_exists($rval, '@language')) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; an element containing "@value" may not ' .
|
||||
'contain both "@type" and "@language".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
$valid_count = $count - 1;
|
||||
if(property_exists($rval, '@type')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if(property_exists($rval, '@index')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if(property_exists($rval, '@language')) {
|
||||
$valid_count -= 1;
|
||||
}
|
||||
if($valid_count !== 0) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; an element containing "@value" may only ' .
|
||||
'have an "@index" property and at most one other property ' .
|
||||
'which can be "@type" or "@language".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
// drop null @values
|
||||
if($rval->{'@value'} === null) {
|
||||
$rval = null;
|
||||
}
|
||||
// drop @language if @value isn't a string
|
||||
else if(property_exists($rval, '@language') &&
|
||||
!is_string($rval->{'@value'})) {
|
||||
unset($rval->{'@language'});
|
||||
}
|
||||
}
|
||||
// convert @type to an array
|
||||
else if(property_exists($rval, '@type') && !is_array($rval->{'@type'})) {
|
||||
$rval->{'@type'} = array($rval->{'@type'});
|
||||
}
|
||||
// handle @set and @list
|
||||
else if(property_exists($rval, '@set') ||
|
||||
property_exists($rval, '@list')) {
|
||||
if($count > 1 && ($count !== 2 && property_exists($rval, '@index'))) {
|
||||
throw new JsonLdException(
|
||||
'Invalid JSON-LD syntax; if an element has the property "@set" ' .
|
||||
'or "@list", then it can have at most one other property that is ' .
|
||||
'"@index".',
|
||||
'jsonld.SyntaxError', array('element' => $rval));
|
||||
}
|
||||
// optimize away @set
|
||||
if(property_exists($rval, '@set')) {
|
||||
$rval = $rval->{'@set'};
|
||||
$keys = array_keys((array)$rval);
|
||||
$count = count($keys);
|
||||
}
|
||||
}
|
||||
// drop objects with only @language
|
||||
else if($count === 1 && property_exists($rval, '@language')) {
|
||||
$rval = null;
|
||||
}
|
||||
|
||||
// expand element according to value expansion rules
|
||||
return $this->_expandValue($active_ctx, $active_property, $element);
|
||||
// drop certain top-level objects that do not occur in lists
|
||||
if(is_object($rval) &&
|
||||
!$options['keepFreeFloatingNodes'] && !$inside_list &&
|
||||
($active_property === null || $expanded_active_property === '@graph')) {
|
||||
// drop empty object or top-level @value
|
||||
if($count === 0 || property_exists($rval, '@value')) {
|
||||
$rval = null;
|
||||
}
|
||||
else {
|
||||
// drop subjects that generate no triples
|
||||
$has_triples = false;
|
||||
$ignore = array('@graph', '@type');
|
||||
foreach($keys as $key) {
|
||||
if(!self::_isKeyword($key) || in_array($key, $ignore)) {
|
||||
$has_triples = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(!$has_triples) {
|
||||
$rval = null;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return $rval;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in a new issue