Class: JSON::LD::Context
- Inherits:
-
Object
- Object
- JSON::LD::Context
- Includes:
- Utils
- Defined in:
- lib/json/ld/context.rb
Defined Under Namespace
Classes: TermDefinition
Instance Attribute Summary collapse
-
#base ⇒ RDF::URI
The base.
-
#context_base ⇒ RDF::URI
Base IRI of the context, if loaded remotely.
-
#default_language ⇒ String
Default language.
-
#doc_base ⇒ RDF::URI
readonly
The base.
-
#iri_to_term ⇒ Hash{RDF::URI => String}
Reverse mappings from IRI to term only for terms, not CURIEs XXX.
- #namer ⇒ BlankNodeNamer
-
#options ⇒ Hash{Symbol => Object}
Global options used in generating IRIs.
-
#provided_context ⇒ Context
A context provided to us that we can use without re-serializing XXX.
-
#term_definitions ⇒ Hash{String => TermDefinition}
readonly
Term definitions.
-
#vocab ⇒ RDF::URI
Default vocabulary.
Instance Method Summary collapse
-
#compact_iri(iri, options = {}) ⇒ String
Compacts an absolute IRI to the shortest matching term or compact IRI.
-
#compact_value(property, value, options = {}) ⇒ Hash
Compact a value.
-
#container(term) ⇒ String
Retrieve container mapping, add it if ‘value` is provided.
-
#create_term_definition(local_context, term, defined) ⇒ Object
Create Term Definition.
- #dup ⇒ Object
-
#expand_iri(value, options = {}) ⇒ RDF::URI, String
Expand an IRI.
-
#expand_value(property, value, options = {}) ⇒ Hash
If active property has a type mapping in the active context set to @id or @vocab, a JSON object with a single member @id whose value is the result of using the IRI Expansion algorithm on value is returned.
-
#find_definition(term) ⇒ Term
Find a term definition.
-
#from_vocabulary(graph) ⇒ self
Build a context from an RDF::Vocabulary definition.
-
#initialize(options = {}) {|ec| ... } ⇒ Context
constructor
Create new evaluation context.
- #inspect ⇒ Object
-
#language(term) ⇒ String
Retrieve the language associated with a term, or the default language otherwise.
-
#parse(local_context, remote_contexts = []) ⇒ Object
Create an Evaluation Context.
-
#reverse?(term) ⇒ Boolean
Is this a reverse term.
-
#reverse_term(term) ⇒ Term
Given a term or IRI, find a reverse term definition matching that term.
-
#serialize(options = {}) ⇒ Hash
Generate @context.
-
#set_mapping(term, value) ⇒ TermDefinition
Set term mapping.
Methods included from Utils
#as_resource, #blank_node?, #index?, #list?, #node?, #node_reference?, #value?
Constructor Details
#initialize(options = {}) {|ec| ... } ⇒ Context
Create new evaluation context
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# File 'lib/json/ld/context.rb', line 160 def initialize( = {}) if [:base] @base = @doc_base = RDF::URI([:base]) @doc_base.canonicalize! @doc_base.fragment = nil @doc_base.query = nil end [:documentLoader] ||= JSON::LD::API.method(:documentLoader) @term_definitions = {} @iri_to_term = { RDF.to_uri.to_s => "rdf", RDF::XSD.to_uri.to_s => "xsd" } @namer = BlankNodeMapper.new("t") @options = # Load any defined prefixes ([:prefixes] || {}).each_pair do |k, v| next if k.nil? @iri_to_term[v.to_s] = k @term_definitions[k.to_s] = TermDefinition.new(k, v.to_s) @term_definitions[k.to_s].simple = true end self.vocab = [:vocab] if [:vocab] self.default_language = [:language] if [:language] #debug("init") {"iri_to_term: #{iri_to_term.inspect}"} yield(self) if block_given? end |
Instance Attribute Details
#base ⇒ RDF::URI
The base.
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# File 'lib/json/ld/context.rb', line 99 def base @base end |
#context_base ⇒ RDF::URI
Returns base IRI of the context, if loaded remotely. XXX.
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# File 'lib/json/ld/context.rb', line 107 def context_base @context_base end |
#default_language ⇒ String
Default language
This adds a language to plain strings that aren’t otherwise coerced
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# File 'lib/json/ld/context.rb', line 123 def default_language @default_language end |
#doc_base ⇒ RDF::URI (readonly)
The base.
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# File 'lib/json/ld/context.rb', line 104 def doc_base @doc_base end |
#iri_to_term ⇒ Hash{RDF::URI => String}
Returns Reverse mappings from IRI to term only for terms, not CURIEs XXX.
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# File 'lib/json/ld/context.rb', line 115 def iri_to_term @iri_to_term end |
#options ⇒ Hash{Symbol => Object}
Returns Global options used in generating IRIs.
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# File 'lib/json/ld/context.rb', line 133 def @options end |
#provided_context ⇒ Context
Returns A context provided to us that we can use without re-serializing XXX.
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# File 'lib/json/ld/context.rb', line 136 def provided_context @provided_context end |
#term_definitions ⇒ Hash{String => TermDefinition} (readonly)
Term definitions
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# File 'lib/json/ld/context.rb', line 112 def term_definitions @term_definitions end |
#vocab ⇒ RDF::URI
Default vocabulary
Sets the default vocabulary used for expanding terms which aren’t otherwise absolute IRIs
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# File 'lib/json/ld/context.rb', line 130 def vocab @vocab end |
Instance Method Details
#compact_iri(iri, options = {}) ⇒ String
Compacts an absolute IRI to the shortest matching term or compact IRI
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# File 'lib/json/ld/context.rb', line 794 def compact_iri(iri, = {}) return if iri.nil? iri = iri.to_s debug("compact_iri(#{iri.inspect}", ) {.inspect} unless [:quiet] depth() do value = .fetch(:value, nil) if [:vocab] && inverse_context.has_key?(iri) debug("") {"vocab and key in inverse context"} unless [:quiet] default_language = self.default_language || @none containers = [] tl, tl_value = "@language", "@null" containers << '@index' if index?(value) if [:reverse] tl, tl_value = "@type", "@reverse" containers << '@set' elsif list?(value) debug("") {"list(#{value.inspect})"} unless [:quiet] # if value is a list object, then set type/language and type/language value to the most specific values that work for all items in the list as follows: containers << "@list" unless index?(value) list = value['@list'] common_type = nil common_language = default_language if list.empty? list.each do |item| item_language, item_type = "@none", "@none" if value?(item) if item.has_key?('@language') item_language = item['@language'] elsif item.has_key?('@type') item_type = item['@type'] else item_language = "@null" end else item_type = '@id' end common_language ||= item_language if item_language != common_language && value?(item) debug("") {"-- #{item_language} conflicts with #{common_language}, use @none"} unless [:quiet] common_language = '@none' end common_type ||= item_type if item_type != common_type common_type = '@none' debug("") {"#{item_type} conflicts with #{common_type}, use @none"} unless [:quiet] end end common_language ||= '@none' common_type ||= '@none' debug("") {"common type: #{common_type}, common language: #{common_language}"} unless [:quiet] if common_type != '@none' tl, tl_value = '@type', common_type else tl_value = common_language end debug("") {"list: containers: #{containers.inspect}, type/language: #{tl.inspect}, type/language value: #{tl_value.inspect}"} unless [:quiet] else if value?(value) if value.has_key?('@language') && !index?(value) tl_value = value['@language'] containers << '@language' elsif value.has_key?('@type') tl_value = value['@type'] tl = '@type' end else tl, tl_value = '@type', '@id' end containers << '@set' debug("") {"value: containers: #{containers.inspect}, type/language: #{tl.inspect}, type/language value: #{tl_value.inspect}"} unless [:quiet] end containers << '@none' tl_value ||= '@null' preferred_values = [] preferred_values << '@reverse' if tl_value == '@reverse' if %w(@id @reverse).include?(tl_value) && value.is_a?(Hash) && value.has_key?('@id') t_iri = compact_iri(value['@id'], :vocab => true, :document_relative => true) if (r_td = term_definitions[t_iri]) && r_td.id == value['@id'] preferred_values.concat(%w(@vocab @id @none)) else preferred_values.concat(%w(@id @vocab @none)) end else preferred_values.concat([tl_value, '@none']) end debug("") {"preferred_values: #{preferred_values.inspect}"} unless [:quiet] if p_term = select_term(iri, containers, tl, preferred_values) debug("") {"=> term: #{p_term.inspect}"} unless [:quiet] return p_term end end # At this point, there is no simple term that iri can be compacted to. If vocab is true and active context has a vocabulary mapping: if [:vocab] && vocab && iri.start_with?(vocab) && iri.length > vocab.length suffix = iri[vocab.length..-1] debug("") {"=> vocab suffix: #{suffix.inspect}"} unless [:quiet] return suffix unless term_definitions.has_key?(suffix) end # The iri could not be compacted using the active context's vocabulary mapping. Try to create a compact IRI, starting by initializing compact IRI to null. This variable will be used to tore the created compact IRI, if any. candidates = [] term_definitions.each do |term, td| next if term.include?(":") next if td.nil? || td.id.nil? || td.id == iri || !iri.start_with?(td.id) # Also skip term if it was not a simple term and the :simple_compact_iris flag is true next if @options[:simple_compact_iris] && !td.simple? suffix = iri[td.id.length..-1] ciri = "#{term}:#{suffix}" candidates << ciri unless value && term_definitions.has_key?(ciri) end if !candidates.empty? debug("") {"=> compact iri: #{candidates.term_sort.first.inspect}"} unless [:quiet] return candidates.term_sort.first end # If we still don't have any terms and we're using standard_prefixes, # try those, and add to mapping if @options[:standard_prefixes] candidates = RDF::Vocabulary. select {|v| iri.start_with?(v.to_uri.to_s) && iri != v.to_uri.to_s}. map do |v| prefix = v.__name__.to_s.split('::').last.downcase set_mapping(prefix, v.to_uri.to_s) iri.sub(v.to_uri.to_s, "#{prefix}:").sub(/:$/, '') end if !candidates.empty? debug("") {"=> standard prefies: #{candidates.term_sort.first.inspect}"} unless [:quiet] return candidates.term_sort.first end end if ![:vocab] # transform iri to a relative IRI using the document's base IRI iri = remove_base(iri) debug("") {"=> relative iri: #{iri.inspect}"} unless [:quiet] return iri else debug("") {"=> absolute iri: #{iri.inspect}"} unless [:quiet] return iri end end end |
#compact_value(property, value, options = {}) ⇒ Hash
Compact a value
FIXME: revisit the specification version of this.
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# File 'lib/json/ld/context.rb', line 1038 def compact_value(property, value, = {}) depth() do debug("compact_value") {"property: #{property.inspect}, value: #{value.inspect}"} num_members = value.keys.length num_members -= 1 if index?(value) && container(property) == '@index' if num_members > 2 debug("") {"can't compact value with # members > 2"} return value end result = case when coerce(property) == '@id' && value.has_key?('@id') && num_members == 1 # Compact an @id coercion debug("") {" (@id & coerce)"} compact_iri(value['@id']) when coerce(property) == '@vocab' && value.has_key?('@id') && num_members == 1 # Compact an @id coercion debug("") {" (@id & coerce & vocab)"} compact_iri(value['@id'], :vocab => true) when value.has_key?('@id') debug("") {" (@id)"} # return value as is value when value['@type'] && (value['@type'], :vocab => true) == coerce(property) # Compact common datatype debug("") {" (@type & coerce) == #{coerce(property)}"} value['@value'] when value['@language'] && (value['@language'] == language(property)) # Compact language debug("") {" (@language) == #{language(property).inspect}"} value['@value'] when num_members == 1 && !value['@value'].is_a?(String) debug("") {" (native)"} value['@value'] when num_members == 1 && default_language.nil? || language(property) == false debug("") {" (!@language)"} value['@value'] else # Otherwise, use original value debug("") {" (no change)"} value end # If the result is an object, tranform keys using any term keyword aliases if result.is_a?(Hash) && result.keys.any? {|k| self.alias(k) != k} debug("") {" (map to key aliases)"} new_element = {} result.each do |k, v| new_element[self.alias(k)] = v end result = new_element end debug("") {"=> #{result.inspect}"} result end end |
#container(term) ⇒ String
Retrieve container mapping, add it if ‘value` is provided
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# File 'lib/json/ld/context.rb', line 653 def container(term) return '@set' if term == '@graph' return term if KEYWORDS.include?(term) term = find_definition(term) term && term.container_mapping end |
#create_term_definition(local_context, term, defined) ⇒ Object
Create Term Definition
Term definitions are created by parsing the information in the given local context for the given term. If the given term is a compact IRI, it may omit an IRI mapping by depending on its prefix having its own term definition. If the prefix is a key in the local context, then its term definition must first be created, through recursion, before continuing. Because a term definition can depend on other term definitions, a mechanism must be used to detect cyclical dependencies. The solution employed here uses a map, defined, that keeps track of whether or not a term has been defined or is currently in the process of being defined. This map is checked before any recursion is attempted.
After all dependencies for a term have been defined, the rest of the information in the local context for the given term is taken into account, creating the appropriate IRI mapping, container mapping, and type mapping or language mapping for the term.
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# File 'lib/json/ld/context.rb', line 362 def create_term_definition(local_context, term, defined) # Expand a string value, unless it matches a keyword debug("create_term_definition") {"term = #{term.inspect}"} # If defined contains the key term, then the associated value must be true, indicating that the term definition has already been created, so return. Otherwise, a cyclical term definition has been detected, which is an error. case defined[term] when TrueClass then return when nil defined[term] = false else raise JsonLdError::CyclicIRIMapping, "Cyclical term dependency found: #{term.inspect}" end # Since keywords cannot be overridden, term must not be a keyword. Otherwise, an invalid value has been detected, which is an error. if KEYWORDS.include?(term) && !%w(@vocab @language).include?(term) raise JsonLdError::KeywordRedefinition, "term must not be a keyword: #{term.inspect}" if @options[:validate] elsif !term_valid?(term) && @options[:validate] raise JsonLdError::InvalidTermDefinition, "term is invalid: #{term.inspect}" end # Remove any existing term definition for term in active context. term_definitions.delete(term) # Initialize value to a the value associated with the key term in local context. value = local_context.fetch(term, false) simple_term = value.is_a?(String) value = {'@id' => value} if value.is_a?(String) case value when nil, {'@id' => nil} # If value equals null or value is a JSON object containing the key-value pair (@id-null), then set the term definition in active context to null, set the value associated with defined's key term to true, and return. debug("") {"=> nil"} term_definitions[term] = TermDefinition.new(term) defined[term] = true return when Hash debug("") {"Hash[#{term.inspect}] = #{value.inspect}"} definition = TermDefinition.new(term) definition.simple = simple_term if value.has_key?('@type') type = value['@type'] # SPEC FIXME: @type may be nil type = case type when nil type when String begin (type, :vocab => true, :documentRelative => false, :local_context => local_context, :defined => defined) rescue JsonLdError::InvalidIRIMapping raise JsonLdError::InvalidTypeMapping, "invalid mapping for '@type': #{type.inspect} on term #{term.inspect}" end else :error end unless %w(@id @vocab).include?(type) || type.is_a?(RDF::URI) && type.absolute? raise JsonLdError::InvalidTypeMapping, "unknown mapping for '@type': #{type.inspect} on term #{term.inspect}" end debug("") {"type_mapping: #{type.inspect}"} definition.type_mapping = type end if value.has_key?('@reverse') raise JsonLdError::InvalidReverseProperty, "unexpected key in #{value.inspect} on term #{term.inspect}" if value.keys.any? {|k| %w(@id).include?(k)} raise JsonLdError::InvalidIRIMapping, "expected value of @reverse to be a string: #{value['@reverse'].inspect} on term #{term.inspect}" unless value['@reverse'].is_a?(String) # Otherwise, set the IRI mapping of definition to the result of using the IRI Expansion algorithm, passing active context, the value associated with the @reverse key for value, true for vocab, true for document relative, local context, and defined. If the result is not an absolute IRI, i.e., it contains no colon (:), an invalid IRI mapping error has been detected and processing is aborted. definition.id = (value['@reverse'], :vocab => true, :documentRelative => true, :local_context => local_context, :defined => defined) raise JsonLdError::InvalidIRIMapping, "non-absolute @reverse IRI: #{definition.id} on term #{term.inspect}" unless definition.id.is_a?(RDF::URI) && definition.id.absolute? # If value contains an @container member, set the container mapping of definition to its value; if its value is neither @set, nor @index, nor null, an invalid reverse property error has been detected (reverse properties only support set- and index-containers) and processing is aborted. if (container = value.fetch('@container', false)) raise JsonLdError::InvalidReverseProperty, "unknown mapping for '@container' to #{container.inspect} on term #{term.inspect}" unless ['@set', '@index', nil].include?(container) definition.container_mapping = container end definition.reverse_property = true elsif value.has_key?('@id') && value['@id'] != term raise JsonLdError::InvalidIRIMapping, "expected value of @id to be a string: #{value['@id'].inspect} on term #{term.inspect}" unless value['@id'].is_a?(String) definition.id = (value['@id'], :vocab => true, :documentRelative => true, :local_context => local_context, :defined => defined) raise JsonLdError::InvalidKeywordAlias, "expected value of @id to not be @context on term #{term.inspect}" if definition.id == '@context' elsif term.include?(':') # If term is a compact IRI with a prefix that is a key in local context then a dependency has been found. Use this algorithm recursively passing active context, local context, the prefix as term, and defined. prefix, suffix = term.split(':') depth {create_term_definition(local_context, prefix, defined)} if local_context.has_key?(prefix) definition.id = if td = term_definitions[prefix] # If term's prefix has a term definition in active context, set the IRI mapping for definition to the result of concatenating the value associated with the prefix's IRI mapping and the term's suffix. td.id + suffix else # Otherwise, term is an absolute IRI. Set the IRI mapping for definition to term term end debug("") {"=> #{definition.id}"} else # Otherwise, active context must have a vocabulary mapping, otherwise an invalid value has been detected, which is an error. Set the IRI mapping for definition to the result of concatenating the value associated with the vocabulary mapping and term. raise JsonLdError::InvalidIRIMapping, "relative term definition without vocab: #{term} on term #{term.inspect}" unless vocab definition.id = vocab + term debug("") {"=> #{definition.id}"} end @iri_to_term[definition.id] = term if simple_term && definition.id if value.has_key?('@container') container = value['@container'] raise JsonLdError::InvalidContainerMapping, "unknown mapping for '@container' to #{container.inspect} on term #{term.inspect}" unless %w(@list @set @language @index).include?(container) debug("") {"container_mapping: #{container.inspect}"} definition.container_mapping = container end if value.has_key?('@language') language = value['@language'] raise JsonLdError::InvalidLanguageMapping, "language must be null or a string, was #{language.inspect}} on term #{term.inspect}" unless language.nil? || (language || "").is_a?(String) language = language.downcase if language.is_a?(String) debug("") {"language_mapping: #{language.inspect}"} definition.language_mapping = language || false end term_definitions[term] = definition defined[term] = true else raise JsonLdError::InvalidTermDefinition, "Term definition for #{term.inspect} is an #{value.class} on term #{term.inspect}" end end |
#dup ⇒ Object
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# File 'lib/json/ld/context.rb', line 1108 def dup # Also duplicate mappings, coerce and list that = self ec = super ec.instance_eval do @term_definitions = that.term_definitions.dup @iri_to_term = that.iri_to_term.dup end ec end |
#expand_iri(value, options = {}) ⇒ RDF::URI, String
Expand an IRI. Relative IRIs are expanded against any document base.
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# File 'lib/json/ld/context.rb', line 716 def (value, = {}) return value unless value.is_a?(String) return value if KEYWORDS.include?(value) depth() do debug("expand_iri") {"value: #{value.inspect}"} unless [:quiet] local_context = [:local_context] defined = .fetch(:defined, {}) # If local context is not null, it contains a key that equals value, and the value associated with the key that equals value in defined is not true, then invoke the Create Term Definition subalgorithm, passing active context, local context, value as term, and defined. This will ensure that a term definition is created for value in active context during Context Processing. if local_context && local_context.has_key?(value) && !defined[value] depth {create_term_definition(local_context, value, defined)} end # If vocab is true and the active context has a term definition for value, return the associated IRI mapping. if [:vocab] && (v_td = term_definitions[value]) debug("") {"match with #{v_td.id}"} unless [:quiet] return v_td.id end # If value contains a colon (:), it is either an absolute IRI or a compact IRI: if value.include?(':') prefix, suffix = value.split(':', 2) debug("") {"prefix: #{prefix.inspect}, suffix: #{suffix.inspect}, vocab: #{vocab.inspect}"} unless [:quiet] # If prefix is underscore (_) or suffix begins with double-forward-slash (//), return value as it is already an absolute IRI or a blank node identifier. return RDF::Node.new(namer.get_sym(suffix)) if prefix == '_' return RDF::URI(value) if suffix[0,2] == '//' # If local context is not null, it contains a key that equals prefix, and the value associated with the key that equals prefix in defined is not true, invoke the Create Term Definition algorithm, passing active context, local context, prefix as term, and defined. This will ensure that a term definition is created for prefix in active context during Context Processing. if local_context && local_context.has_key?(prefix) && !defined[prefix] create_term_definition(local_context, prefix, defined) end # If active context contains a term definition for prefix, return the result of concatenating the IRI mapping associated with prefix and suffix. result = if (td = term_definitions[prefix]) result = td.id + suffix else # (Otherwise) Return value as it is already an absolute IRI. RDF::URI(value) end debug("") {"=> #{result.inspect}"} unless [:quiet] return result end debug("") {"=> #{result.inspect}"} unless [:quiet] result = if [:vocab] && vocab # If vocab is true, and active context has a vocabulary mapping, return the result of concatenating the vocabulary mapping with value. vocab + value elsif [:documentRelative] && base = .fetch(:base, self.base) # Otherwise, if document relative is true, set value to the result of resolving value against the base IRI. Only the basic algorithm in section 5.2 of [RFC3986] is used; neither Syntax-Based Normalization nor Scheme-Based Normalization are performed. Characters additionally allowed in IRI references are treated in the same way that unreserved characters are treated in URI references, per section 6.5 of [RFC3987]. RDF::URI(base).join(value) elsif local_context && RDF::URI(value).relative? # If local context is not null and value is not an absolute IRI, an invalid IRI mapping error has been detected and processing is aborted. raise JSON::LD::JsonLdError::InvalidIRIMapping, "not an absolute IRI: #{value}" else RDF::URI(value) end debug("") {"=> #{result}"} unless [:quiet] result end end |
#expand_value(property, value, options = {}) ⇒ Hash
If active property has a type mapping in the active context set to @id or @vocab, a JSON object with a single member @id whose value is the result of using the IRI Expansion algorithm on value is returned.
Otherwise, the result will be a JSON object containing an @value member whose value is the passed value. Additionally, an @type member will be included if there is a type mapping associated with the active property or an @language member if value is a string and there is language mapping associated with the active property.
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# File 'lib/json/ld/context.rb', line 960 def (property, value, = {}) = {:useNativeTypes => false}.merge() depth() do debug("expand_value") {"property: #{property.inspect}, value: #{value.inspect}"} # If the active property has a type mapping in active context that is @id, return a new JSON object containing a single key-value pair where the key is @id and the value is the result of using the IRI Expansion algorithm, passing active context, value, and true for document relative. if (td = term_definitions.fetch(property, TermDefinition.new(property))) && td.type_mapping == '@id' debug("") {"as relative IRI: #{value.inspect}"} return {'@id' => (value, :documentRelative => true).to_s} end # If active property has a type mapping in active context that is @vocab, return a new JSON object containing a single key-value pair where the key is @id and the value is the result of using the IRI Expansion algorithm, passing active context, value, true for vocab, and true for document relative. if td.type_mapping == '@vocab' debug("") {"as vocab IRI: #{value.inspect}"} return {'@id' => (value, :vocab => true, :documentRelative => true).to_s} end value = RDF::Literal(value) if value.is_a?(Date) || value.is_a?(DateTime) || value.is_a?(Time) result = case value when RDF::URI, RDF::Node debug("URI | BNode") { value.to_s } {'@id' => value.to_s} when RDF::Literal debug("Literal") {"datatype: #{value.datatype.inspect}"} res = {} if [:useNativeTypes] && [RDF::XSD.boolean, RDF::XSD.integer, RDF::XSD.double].include?(value.datatype) res['@value'] = value.object res['@type'] = uri(coerce(property)) if coerce(property) else value.canonicalize! if value.datatype == RDF::XSD.double res['@value'] = value.to_s if coerce(property) res['@type'] = uri(coerce(property)).to_s elsif value.has_datatype? res['@type'] = uri(value.datatype).to_s elsif value.has_language? || language(property) res['@language'] = (value.language || language(property)).to_s end end res else # Otherwise, initialize result to a JSON object with an @value member whose value is set to value. res = {'@value' => value} if td.type_mapping res['@type'] = td.type_mapping.to_s elsif value.is_a?(String) if td.language_mapping res['@language'] = td.language_mapping elsif default_language && td.language_mapping.nil? res['@language'] = default_language end end res end debug("") {"=> #{result.inspect}"} result end end |
#find_definition(term) ⇒ Term
Find a term definition
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# File 'lib/json/ld/context.rb', line 644 def find_definition(term) term.is_a?(TermDefinition) ? term : term_definitions[term.to_s] end |
#from_vocabulary(graph) ⇒ self
Build a context from an RDF::Vocabulary definition.
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# File 'lib/json/ld/context.rb', line 560 def from_vocabulary(graph) statements = {} ranges = {} # Add term definitions for each class and property not in schema:, and # for those properties having an object range graph.each do |statement| next if statement.subject.node? (statements[statement.subject] ||= []) << statement # Keep track of predicate ranges if [RDF::RDFS.range, RDF::SCHEMA.rangeIncludes].include?(statement.predicate) (ranges[statement.subject] ||= []) << statement.object end end # Add term definitions for each class and property not in vocab, and # for those properties having an object range statements.each do |subject, values| types = values.select {|v| v.predicate == RDF.type}.map(&:object) is_property = types.any? {|t| t.to_s.include?("Property")} term = subject.to_s.split(/[\/\#]/).last if !is_property # Ignore if there's a default voabulary and this is not a property next if vocab && subject.to_s.start_with?(vocab) # otherwise, create a term definition td = term_definitions[term] = TermDefinition.new(term, subject.to_s) else prop_ranges = ranges.fetch(subject, []) # If any range is empty or member of range includes rdfs:Literal or schema:Text next if vocab && prop_ranges.empty? || prop_ranges.include?(RDF::SCHEMA.Text) || prop_ranges.include?(RDF::RDFS.Literal) td = term_definitions[term] = TermDefinition.new(term, subject.to_s) # Set context typing based on first element in range case r = prop_ranges.first when RDF::XSD.string if self.default_language td.language_mapping = false end when RDF::XSD.boolean, RDF::SCHEMA.Boolean, RDF::XSD.date, RDF::SCHEMA.Date, RDF::XSD.dateTime, RDF::SCHEMA.DateTime, RDF::XSD.time, RDF::SCHEMA.Time, RDF::XSD.duration, RDF::SCHEMA.Duration, RDF::XSD.decimal, RDF::SCHEMA.Number, RDF::XSD.float, RDF::SCHEMA.Float, RDF::XSD.integer, RDF::SCHEMA.Integer td.type_mapping = r td.simple = false else # It's an object range (includes schema:URL) td.type_mapping = '@id' end end end self end |
#inspect ⇒ Object
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# File 'lib/json/ld/context.rb', line 1099 def inspect v = %w([Context) v << "base=#{base}" if base v << "vocab=#{vocab}" if vocab v << "def_language=#{default_language}" if default_language v << "term_definitions[#{term_definitions.length}]=#{term_definitions}" v.join(" ") + "]" end |
#language(term) ⇒ String
Retrieve the language associated with a term, or the default language otherwise
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# File 'lib/json/ld/context.rb', line 664 def language(term) term = find_definition(term) lang = term && term.language_mapping lang.nil? ? @default_language : lang end |
#parse(local_context, remote_contexts = []) ⇒ Object
Create an Evaluation Context
When processing a JSON-LD data structure, each processing rule is applied using information provided by the active context. This section describes how to produce an active context.
The active context contains the active term definitions which specify how properties and values have to be interpreted as well as the current base IRI, the vocabulary mapping and the default language. Each term definition consists of an IRI mapping, a boolean flag reverse property, an optional type mapping or language mapping, and an optional container mapping. A term definition can not only be used to map a term to an IRI, but also to map a term to a keyword, in which case it is referred to as a keyword alias.
When processing, the active context is initialized without any term definitions, vocabulary mapping, or default language. If a local context is encountered during processing, a new active context is created by cloning the existing active context. Then the information from the local context is merged into the new active context. Given that local contexts may contain references to remote contexts, this includes their retrieval.
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# File 'lib/json/ld/context.rb', line 248 def parse(local_context, remote_contexts = []) result = self.dup local_context = [local_context] unless local_context.is_a?(Array) local_context.each do |context| depth do case context when nil # 3.1 If niil, set to a new empty context result = Context.new() when Context debug("parse") {"context: #{context.inspect}"} result = context.dup when IO, StringIO debug("parse") {"io: #{context}"} # Load context document, if it is a string begin ctx = JSON.load(context) raise JSON::LD::JsonLdError::InvalidRemoteContext, "Context missing @context key" if @options[:validate] && ctx['@context'].nil? result = parse(ctx["@context"] ? ctx["@context"].dup : {}) result.provided_context = ctx["@context"] result rescue JSON::ParserError => e debug("parse") {"Failed to parse @context from remote document at #{context}: #{e.}"} raise JSON::LD::JsonLdError::InvalidRemoteContext, "Failed to parse remote context at #{context}: #{e.}" if @options[:validate] self.dup end when String, RDF::URI debug("parse") {"remote: #{context}, base: #{result.context_base || result.base}"} # Load context document, if it is a string # 3.2.1) Set context to the result of resolving value against the base IRI which is established as specified in section 5.1 Establishing a Base URI of [RFC3986]. Only the basic algorithm in section 5.2 of [RFC3986] is used; neither Syntax-Based Normalization nor Scheme-Based Normalization are performed. Characters additionally allowed in IRI references are treated in the same way that unreserved characters are treated in URI references, per section 6.5 of [RFC3987]. context = RDF::URI(result.context_base || result.base).join(context) raise JsonLdError::RecursiveContextInclusion, "#{context}" if remote_contexts.include?(context.to_s) remote_contexts << context.to_s context_no_base = self.dup context_no_base.base = nil unless @options[:processingMode] == "json-ld-1.0" context_no_base.provided_context = context.to_s end context_no_base.context_base = context.to_s begin @options[:documentLoader].call(context.to_s) do |remote_doc| # 3.2.5) Dereference context. If the dereferenced document has no top-level JSON object with an @context member, an invalid remote context has been detected and processing is aborted; otherwise, set context to the value of that member. jo = case remote_doc.document when String then JSON.parse(remote_doc.document) else remote_doc.document end raise JsonLdError::InvalidRemoteContext, "#{context}" unless jo.is_a?(Hash) && jo.has_key?('@context') context = jo['@context'] if @options[:processingMode] == "json-ld-1.0" context_no_base.provided_context = context.dup end end rescue JsonLdError raise rescue Exception => e debug("parse") {"Failed to retrieve @context from remote document at #{context_no_base.context_base.inspect}: #{e.}"} raise JsonLdError::LoadingRemoteContextFailed, "#{context_no_base.context_base}", e.backtrace end # 3.2.6) Set context to the result of recursively calling this algorithm, passing context no base for active context, context for local context, and remote contexts. context = context_no_base.parse(context, remote_contexts.dup) context.provided_context = context_no_base.provided_context context.base ||= result.base result = context debug("parse") {"=> provided_context: #{context.inspect}"} when Hash # If context has a @vocab member: if its value is not a valid absolute IRI or null trigger an INVALID_VOCAB_MAPPING error; otherwise set the active context's vocabulary mapping to its value and remove the @vocab member from context. context = context.dup # keep from modifying a hash passed as a param { '@base' => :base=, '@language' => :default_language=, '@vocab' => :vocab= }.each do |key, setter| v = context.fetch(key, false) unless v == false context.delete(key) debug("parse") {"Set #{key} to #{v.inspect}"} result.send(setter, v) end end defined = {} # For each key-value pair in context invoke the Create Term Definition subalgorithm, passing result for active context, context for local context, key, and defined depth do context.keys.each do |key| result.create_term_definition(context, key, defined) end end else # 3.3) If context is not a JSON object, an invalid local context error has been detected and processing is aborted. raise JsonLdError::InvalidLocalContext, context.inspect end end end result end |
#reverse?(term) ⇒ Boolean
Is this a reverse term
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# File 'lib/json/ld/context.rb', line 674 def reverse?(term) term = find_definition(term) term && term.reverse_property end |
#reverse_term(term) ⇒ Term
Given a term or IRI, find a reverse term definition matching that term. If the term is already reversed, find a non-reversed version.
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# File 'lib/json/ld/context.rb', line 684 def reverse_term(term) # Direct lookup of term term = term_definitions[term.to_s] if term_definitions.has_key?(term.to_s) && !term.is_a?(TermDefinition) # Lookup term, assuming term is an IRI unless term.is_a?(TermDefinition) td = term_definitions.values.detect {|t| t.id == term.to_s} # Otherwise create a temporary term definition term = td || TermDefinition.new(term.to_s, (term, vocab:true)) end # Now, return a term, which reverses this term term_definitions.values.detect {|t| t.id == term.id && t.reverse_property != term.reverse_property} end |
#serialize(options = {}) ⇒ Hash
Generate @context
If a context was supplied in global options, use that, otherwise, generate one from this representation.
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# File 'lib/json/ld/context.rb', line 510 def serialize( = {}) depth() do # FIXME: not setting provided_context now use_context = case provided_context when String, RDF::URI debug "serlialize: reuse context: #{provided_context.inspect}" provided_context.to_s when Hash, Array debug "serlialize: reuse context: #{provided_context.inspect}" provided_context else debug("serlialize: generate context") debug("") {"=> context: #{inspect}"} ctx = {} ctx['@base'] = base.to_s if base && base != doc_base ctx['@language'] = default_language.to_s if default_language ctx['@vocab'] = vocab.to_s if vocab # Term Definitions term_definitions.keys.sort.each do |term| defn = term_definitions[term].to_context_definition(self) ctx[term] = defn if defn end debug("") {"start_doc: context=#{ctx.inspect}"} ctx end # Return hash with @context, or empty r = {} r['@context'] = use_context unless use_context.nil? || use_context.empty? r end end |
#set_mapping(term, value) ⇒ TermDefinition
Set term mapping
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# File 'lib/json/ld/context.rb', line 626 def set_mapping(term, value) debug("") {"map #{term.inspect} to #{value.inspect}"} term = term.to_s term_definitions[term] = TermDefinition.new(term, value) term_definitions[term].simple = true term_sym = term.empty? ? "" : term.to_sym iri_to_term.delete(term_definitions[term].id.to_s) if term_definitions[term].id.is_a?(String) @options[:prefixes][term_sym] = value if @options.has_key?(:prefixes) iri_to_term[value.to_s] = term term_definitions[term] end |