Class: JSON::LD::API

Inherits:
Object
  • Object
show all
Includes:
Compact, Expand, Flatten, Frame, FromRDF, ToRDF, RDF::Util::Logger
Defined in:
lib/json/ld/api.rb,
lib/json/ld/html/rexml.rb,
lib/json/ld/html/nokogiri.rb

Overview

A JSON-LD processor based on the JsonLdProcessor interface.

This API provides a clean mechanism that enables developers to convert JSON-LD data into a a variety of output formats that are easier to work with in various programming languages. If a JSON-LD API is provided in a programming environment, the entirety of the following API must be implemented.

Note that the API method signatures are somewhat different than what is specified, as the use of Futures and explicit callback parameters is not as relevant for Ruby-based interfaces.

See Also:

Author:

Defined Under Namespace

Modules: Nokogiri, REXML Classes: RemoteDocument

Constant Summary collapse

OPEN_OPTS =

Options used for open_file

{
  headers: { "Accept" => "application/ld+json, text/html;q=0.8, application/xhtml+xml;q=0.8, application/json;q=0.5" }
}
%w[rel http://www.w3.org/ns/json-ld#context].freeze
%w[rel alternate].freeze
%w[type application/ld+json].freeze
JSON_LD_PROCESSING_MODES = 
%w[json-ld-1.0 json-ld-1.1].freeze
SCRIPT_LOADERS =

Hash of recognized script types and the loaders that decode them into a hash or array of hashes.

{
  'application/ld+json' => ->(content, url:, **options) do
      validate_input(content, url: url) if options[:validate]
      mj_opts = options.keep_if { |k, v| k != :adapter || MUTLI_JSON_ADAPTERS.include?(v) }
      MultiJson.load(content, **mj_opts)
    end
}

Constants included from Compact

Compact::CONTAINER_MAPPING_LANGUAGE_INDEX_ID_TYPE, Compact::EXPANDED_PROPERTY_DIRECTION_INDEX_LANGUAGE_VALUE

Constants included from Expand

Expand::CONTAINER_INDEX_ID_TYPE, Expand::KEYS_INCLUDED_TYPE_REVERSE, Expand::KEYS_SET_LIST_INDEX, Expand::KEYS_VALUE_LANGUAGE_TYPE_INDEX_DIRECTION, Expand::KEY_ID

Instance Attribute Summary collapse

Class Method Summary collapse

Methods included from Frame

#cleanup_null, #cleanup_preserve, #count_blank_node_identifiers, #count_blank_node_identifiers_internal, #frame, #prune_bnodes, #remove_dependents

Methods included from Utils

#add_value, #as_array, #as_resource, #blank_node?, #compare_values, #graph?, #has_value?, #index?, #list?, #node?, #node_or_ref?, #node_reference?, #property?, #simple_graph?, #value?

Methods included from FromRDF

#from_statements

Methods included from Flatten

#create_annotations, #create_node_map, #rename_bnodes

Methods included from ToRDF

#item_to_rdf, #node, #parse_list

Methods included from Compact

#compact

Methods included from Expand

#expand

Instance Attribute Details

#context ⇒ JSON::LD::Context

Input evaluation context

Returns:



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# File 'lib/json/ld/api.rb', line 58

def context
  @context
end

#input ⇒ String, ...

Current input

Returns:

  • (String, #read, Hash, Array) 


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# File 'lib/json/ld/api.rb', line 53

attr_accessor :value

#namer ⇒ JSON::LD::BlankNodeNamer (readonly)

Current Blank Node Namer

Returns:



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# File 'lib/json/ld/api.rb', line 63

def namer
  @namer
end

#value ⇒ String, ...

Current input

Returns:

  • (String, #read, Hash, Array) 


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# File 'lib/json/ld/api.rb', line 53

def value
  @value
end

Class Method Details

.add_script_loader(type, loader) ⇒ Object

Adds a loader for some specific content type

Parameters:

  • type (String)
  • loader (Proc) 


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# File 'lib/json/ld/api.rb', line 780

def self.add_script_loader(type, loader)
  SCRIPT_LOADERS[type] = loader
end

.compact(input, context, expanded: false, serializer: nil, **options) {|jsonld| ... } ⇒ Object, Hash

Compacts the given input according to the steps in the Compaction Algorithm. The input must be copied, compacted and returned if there are no errors. If the compaction fails, an appropirate exception must be thrown.

If no context is provided, the input document is compacted using the top-level context of the document

The resulting Hash is either returned or yielded, if a block is given.

Parameters:

  • input (String, #read, Hash, Array) —

    The JSON-LD object to copy and perform the compaction upon.

  • context (String, #read, Hash, Array, JSON::LD::Context) —

    The base context to use when compacting the input.

  • serializer (Proc) (defaults to: nil) —

    (nil) A Serializer instance used for generating the JSON serialization of the result. If absent, the internal Ruby objects are returned, which can be transformed to JSON externally via #to_json. See serializer.

  • expanded (Boolean) (defaults to: false) —

    (false) Input is already expanded

  • options (Hash{Symbol => Object})

Options Hash (**options):

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • jsonld

Yield Parameters:

  • jsonld (Hash) —

    The compacted JSON-LD document

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, Hash) —

    If a block is given, the result of evaluating the block is returned, otherwise, the compacted JSON-LD document

Raises:

See Also:



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# File 'lib/json/ld/api.rb', line 235

def self.compact(input, context, expanded: false, serializer: nil, **options)
  result = nil
  options = { compactToRelative: true }.merge(options)

  # 1) Perform the Expansion Algorithm on the JSON-LD input.
  #    This removes any existing context to allow the given context to be cleanly applied.
  expanded_input = if expanded
    input
  else
    API.expand(input, ordered: false, **options) do |res, base_iri|
      options[:base] ||= RDF::URI(base_iri) if base_iri && options[:compactToRelative]
      res
    end
  end

  API.new(expanded_input, context, no_default_base: true, **options) do
    # log_debug(".compact") {"expanded input: #{expanded_input.to_json(JSON_STATE) rescue 'malformed json'}"}
    result = compact(value)

    # xxx) Add the given context to the output
    ctx = self.context.serialize(provided_context: context)
    if result.is_a?(Array)
      kwgraph = self.context.compact_iri('@graph', vocab: true)
      result = result.empty? ? {} : { kwgraph => result }
    end
    result = ctx.merge(result) unless ctx.fetch('@context', {}).empty?
  end
  result = serializer.call(result, **options) if serializer
  block_given? ? yield(result) : result
end

.documentLoader(url, extractAllScripts: false, profile: nil, requestProfile: nil, **options) {|remote_document| ... } ⇒ Object

Default document loader.

Parameters:

  • url (RDF::URI, String)
  • extractAllScripts (Boolean) (defaults to: false) —

    If set to true, when extracting JSON-LD script elements from HTML, unless a specific fragment identifier is targeted, extracts all encountered JSON-LD script elements using an array form, if necessary.

  • profile (String) (defaults to: nil) —

    When the resulting contentType is text/html or application/xhtml+xml, this option determines the profile to use for selecting a JSON-LD script elements.

  • requestProfile (String) (defaults to: nil) —

    One or more IRIs to use in the request as a profile parameter.

  • options (Hash<Symbol => Object>)

Yields:

  • remote_document

Yield Parameters:

Raises:

  • (IOError) 


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# File 'lib/json/ld/api.rb', line 734

def self.documentLoader(url, extractAllScripts: false, profile: nil, requestProfile: nil, **options, &block)
  case url
  when IO, StringIO
    base_uri = options[:base]
    base_uri ||= url.base_uri if url.respond_to?(:base_uri)
    content_type = options[:content_type]
    content_type ||= url.content_type if url.respond_to?(:content_type)
    context_url = if url.respond_to?(:links) && url.links &&
                     (content_type == 'application/json' || content_type.match?(%r{application/(^ld)+json}))
      link = url.links.find_link(LINK_REL_CONTEXT)
      link&.href
    end

    yield(RemoteDocument.new(url.read,
      documentUrl: base_uri,
      contentType: content_type,
      contextUrl: context_url))
  else
    RDF::Util::File.open_file(url, **options, &block)
  end
end

.expand(input, framing: false, serializer: nil, **options) {|jsonld, base_iri| ... } ⇒ Object, Array<Hash>

Expands the given input according to the steps in the Expansion Algorithm. The input must be copied, expanded and returned if there are no errors. If the expansion fails, an appropriate exception must be thrown.

The resulting Array either returned or yielded

Parameters:

  • input (String, #read, Hash, Array) —

    The JSON-LD object to copy and perform the expansion upon.

  • serializer (Proc) (defaults to: nil) —

    (nil) A Serializer method used for generating the JSON serialization of the result. If absent, the internal Ruby objects are returned, which can be transformed to JSON externally via #to_json. See serializer.

  • options (Hash{Symbol => Object})

Options Hash (**options):

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • jsonld, base_iri

Yield Parameters:

  • jsonld (Array<Hash>) —

    The expanded JSON-LD document

  • base_iri (RDF::URI) —

    The document base as determined during expansion

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, Array<Hash>) —

    If a block is given, the result of evaluating the block is returned, otherwise, the expanded JSON-LD document

Raises:

See Also:



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# File 'lib/json/ld/api.rb', line 183

def self.expand(input, framing: false, serializer: nil, **options, &block)
  result = doc_base = nil
  API.new(input, options[:expandContext], **options) do
    result = expand(value, nil, context,
      framing: framing)
    doc_base = @options[:base]
  end

  # If, after the algorithm outlined above is run, the resulting element is an JSON object with just a @graph property, element is set to the value of @graph's value.
  result = result['@graph'] if result.is_a?(Hash) && result.length == 1 && result.key?('@graph')

  # Finally, if element is a JSON object, it is wrapped into an array.
  result = [result].compact unless result.is_a?(Array)
  result = serializer.call(result, **options) if serializer

  if block
    case block.arity
    when 1 then yield(result)
    when 2 then yield(result, doc_base)
    else
      raise "Unexpected number of yield parameters to expand"
    end
  else
    result
  end
end

.flatten(input, context, expanded: false, serializer: nil, **options) {|jsonld| ... } ⇒ Object, Hash

This algorithm flattens an expanded JSON-LD document by collecting all properties of a node in a single JSON object and labeling all blank nodes with blank node identifiers. This resulting uniform shape of the document, may drastically simplify the code required to process JSON-LD data in certain applications.

The resulting Array is either returned, or yielded if a block is given.

Parameters:

  • input (String, #read, Hash, Array) —

    The JSON-LD object or array of JSON-LD objects to flatten or an IRI referencing the JSON-LD document to flatten.

  • context (String, #read, Hash, Array, JSON::LD::EvaluationContext) —

    An optional external context to use additionally to the context embedded in input when expanding the input.

  • expanded (Boolean) (defaults to: false) —

    (false) Input is already expanded

  • serializer (Proc) (defaults to: nil) —

    (nil) A Serializer instance used for generating the JSON serialization of the result. If absent, the internal Ruby objects are returned, which can be transformed to JSON externally via #to_json. See serializer.

  • options (Hash{Symbol => Object})

Options Hash (**options):

  • :createAnnotations (Boolean) —

    Unfold embedded nodes which can be represented using @annotation.

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • jsonld

Yield Parameters:

  • jsonld (Hash) —

    The flattened JSON-LD document

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, Hash) —

    If a block is given, the result of evaluating the block is returned, otherwise, the flattened JSON-LD document

See Also:



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# File 'lib/json/ld/api.rb', line 290

def self.flatten(input, context, expanded: false, serializer: nil, **options)
  flattened = []
  options = {
    compactToRelative: true
  }.merge(options)

  # Expand input to simplify processing
  expanded_input = if expanded
    input
  else
    API.expand(input, **options) do |result, base_iri|
      options[:base] ||= RDF::URI(base_iri) if base_iri && options[:compactToRelative]
      result
    end
  end

  # Initialize input using
  API.new(expanded_input, context, no_default_base: true, **options) do
    # log_debug(".flatten") {"expanded input: #{value.to_json(JSON_STATE) rescue 'malformed json'}"}

    # Rename blank nodes recusively. Note that this does not create new blank node identifiers where none exist, which is performed in the node map generation algorithm.
    @value = rename_bnodes(@value) if @options[:rename_bnodes]

    # Initialize node map to a JSON object consisting of a single member whose key is @default and whose value is an empty JSON object.
    graph_maps = { '@default' => {} }
    create_node_map(value, graph_maps)

    # If create annotations flag is set, then update each node map in graph maps with the result of calling the create annotations algorithm.
    if options[:createAnnotations]
      graph_maps.each_value do |node_map|
        create_annotations(node_map)
      end
    end

    default_graph = graph_maps['@default']
    graph_maps.keys.opt_sort(ordered: @options[:ordered]).each do |graph_name|
      next if graph_name == '@default'

      graph = graph_maps[graph_name]
      entry = default_graph[graph_name] ||= { '@id' => graph_name }
      nodes = entry['@graph'] ||= []
      graph.keys.opt_sort(ordered: @options[:ordered]).each do |id|
        nodes << graph[id] unless node_reference?(graph[id])
      end
    end
    default_graph.keys.opt_sort(ordered: @options[:ordered]).each do |id|
      flattened << default_graph[id] unless node_reference?(default_graph[id])
    end

    if context && !flattened.empty?
      # Otherwise, return the result of compacting flattened according the Compaction algorithm passing context ensuring that the compaction result uses the @graph keyword (or its alias) at the top-level, even if the context is empty or if there is only one element to put in the @graph array. This ensures that the returned document has a deterministic structure.
      compacted = as_array(compact(flattened))
      kwgraph = self.context.compact_iri('@graph', vocab: true)
      flattened = self.context
        .serialize(provided_context: context)
        .merge(kwgraph => compacted)
    end
  end

  flattened = serializer.call(flattened, **options) if serializer
  block_given? ? yield(flattened) : flattened
end

.frame(input, frame, expanded: false, serializer: nil, **options) {|jsonld| ... } ⇒ Object, Hash

Frames the given input using the frame according to the steps in the Framing Algorithm. The input is used to build the framed output and is returned if there are no errors. If there are no matches for the frame, null must be returned. Exceptions must be thrown if there are errors.

The resulting Array is either returned, or yielded if a block is given.

Parameters:

  • input (String, #read, Hash, Array) —

    The JSON-LD object to copy and perform the framing on.

  • frame (String, #read, Hash, Array) —

    The frame to use when re-arranging the data.

  • expanded (Boolean) (defaults to: false) —

    (false) Input is already expanded

  • options (Hash) —

    a customizable set of options

Options Hash (**options):

  • :embed ('@always', '@link', '@once', '@never') — default: '@once' —

    a flag specifying that objects should be directly embedded in the output, instead of being referred to by their IRI.

  • :explicit (Boolean) — default: false —

    a flag specifying that for properties to be included in the output, they must be explicitly declared in the framing context.

  • :requireAll (Boolean) — default: false —

    A flag specifying that all properties present in the input frame must either have a default value or be present in the JSON-LD input for the frame to match.

  • :omitDefault (Boolean) — default: false —

    a flag specifying that properties that are missing from the JSON-LD input should be omitted from the output.

  • :pruneBlankNodeIdentifiers (Boolean) — default: true —

    removes blank node identifiers that are only used once.

  • :omitGraph (Boolean) —

    does not use @graph at top level unless necessary to describe multiple objects, defaults to true if processingMode is 1.1, otherwise false.

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • jsonld

Yield Parameters:

  • jsonld (Hash) —

    The framed JSON-LD document

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, Hash) —

    If a block is given, the result of evaluating the block is returned, otherwise, the framed JSON-LD document

Raises:

  • (InvalidFrame)

See Also:



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# File 'lib/json/ld/api.rb', line 382

def self.frame(input, frame, expanded: false, serializer: nil, **options)
  result = nil
  options = {
    base: (RDF::URI(input) if input.is_a?(String)),
    compactArrays: true,
    compactToRelative: true,
    embed: '@once',
    explicit: false,
    requireAll: false,
    omitDefault: false
  }.merge(options)

  framing_state = {
    graphMap: {},
    graphStack: [],
    subjectStack: [],
    link: {},
    embedded: false # False at the top-level
  }

  # de-reference frame to create the framing object
  frame = case frame
  when Hash then frame.dup
  when IO, StringIO, String
    remote_doc = loadRemoteDocument(frame,
      profile: 'http://www.w3.org/ns/json-ld#frame',
      requestProfile: 'http://www.w3.org/ns/json-ld#frame',
                                    **options)
    if remote_doc.document.is_a?(String)
      mj_opts = options.keep_if { |k, v| k != :adapter || MUTLI_JSON_ADAPTERS.include?(v) }
      MultiJson.load(remote_doc.document, **mj_opts)
    else
      remote_doc.document
    end
  end

  # Expand input to simplify processing
  expanded_input = if expanded
    input
  else
    API.expand(input, ordered: false, **options) do |res, base_iri|
      options[:base] ||= RDF::URI(base_iri) if base_iri && options[:compactToRelative]
      res
    end
  end

  # Expand frame to simplify processing
  expanded_frame = API.expand(frame, framing: true, ordered: false, **options)

  # Initialize input using frame as context
  API.new(expanded_input, frame['@context'], no_default_base: true, **options) do
    # log_debug(".frame") {"expanded input: #{expanded_input.to_json(JSON_STATE) rescue 'malformed json'}"}
    # log_debug(".frame") {"expanded frame: #{expanded_frame.to_json(JSON_STATE) rescue 'malformed json'}"}

    if %w[@first @last].include?(options[:embed]) && context.processingMode('json-ld-1.1')
      if @options[:validate]
        raise JSON::LD::JsonLdError::InvalidEmbedValue,
          "#{options[:embed]} is not a valid value of @embed in 1.1 mode"
      end

      warn "[DEPRECATION] #{options[:embed]}  is not a valid value of @embed in 1.1 mode.\n"
    end

    # Set omitGraph option, if not present, based on processingMode
    options[:omitGraph] = context.processingMode('json-ld-1.1') unless options.key?(:omitGraph)

    # Rename blank nodes recusively. Note that this does not create new blank node identifiers where none exist, which is performed in the node map generation algorithm.
    @value = rename_bnodes(@value)

    # Get framing nodes from expanded input, replacing Blank Node identifiers as necessary
    create_node_map(value, framing_state[:graphMap], active_graph: '@default')

    frame_keys = frame.keys.map { |k| context.expand_iri(k, vocab: true) }
    if frame_keys.include?('@graph')
      # If frame contains @graph, it matches the default graph.
      framing_state[:graph] = '@default'
    else
      # If frame does not contain @graph used the merged graph.
      framing_state[:graph] = '@merged'
      framing_state[:link]['@merged'] = {}
      framing_state[:graphMap]['@merged'] = merge_node_map_graphs(framing_state[:graphMap])
    end

    framing_state[:subjects] = framing_state[:graphMap][framing_state[:graph]]

    result = []
    frame(framing_state, framing_state[:subjects].keys.opt_sort(ordered: @options[:ordered]),
      (expanded_frame.first || {}), parent: result, **options)

    # Default to based on processinMode
    unless options.key?(:pruneBlankNodeIdentifiers)
      options[:pruneBlankNodeIdentifiers] = context.processingMode('json-ld-1.1')
    end

    # Count blank node identifiers used in the document, if pruning
    if options[:pruneBlankNodeIdentifiers]
      bnodes_to_clear = count_blank_node_identifiers(result).collect { |k, v| k if v == 1 }.compact
      result = prune_bnodes(result, bnodes_to_clear)
    end

    # Replace values with `@preserve` with the content of its entry.
    result = cleanup_preserve(result)
    # log_debug(".frame") {"expanded result: #{result.to_json(JSON_STATE) rescue 'malformed json'}"}

    # Compact result
    compacted = compact(result)

    # @replace `@null` with nil, compacting arrays
    compacted = cleanup_null(compacted)
    compacted = [compacted] unless options[:omitGraph] || compacted.is_a?(Array)

    # Add the given context to the output
    result = if compacted.is_a?(Array)
      kwgraph = context.compact_iri('@graph', vocab: true)
      { kwgraph => compacted }
    else
      compacted
    end
    # Only add context if one was provided
    result = context.serialize(provided_context: frame).merge(result) if frame['@context']

    # log_debug(".frame") {"after compact: #{result.to_json(JSON_STATE) rescue 'malformed json'}"}
    result
  end

  result = serializer.call(result, **options) if serializer
  block_given? ? yield(result) : result
end

.fromRdf(input, useRdfType: false, useNativeTypes: false, serializer: nil, **options) {|jsonld| ... } ⇒ Object, Hash Also known as: fromRDF

Take an ordered list of RDF::Statements and turn them into a JSON-LD document.

The resulting Array is either returned or yielded, if a block is given.

Parameters:

  • input (RDF::Enumerable)
  • useRdfType (Boolean) (defaults to: false) —

    (false) If set to true, the JSON-LD processor will treat rdf:type like a normal property instead of using @type.

  • useNativeTypes (Boolean) (defaults to: false) —

    (false) use native representations

  • serializer (Proc) (defaults to: nil) —

    (nil) A Serializer instance used for generating the JSON serialization of the result. If absent, the internal Ruby objects are returned, which can be transformed to JSON externally via #to_json. See serializer.

  • options (Hash{Symbol => Object})

Options Hash (**options):

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • jsonld

Yield Parameters:

  • jsonld (Hash) —

    The JSON-LD document in expanded form

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, Hash) —

    If a block is given, the result of evaluating the block is returned, otherwise, the expanded JSON-LD document



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# File 'lib/json/ld/api.rb', line 585

def self.fromRdf(input, useRdfType: false, useNativeTypes: false, serializer: nil, **options)
  result = nil

  API.new(nil, nil, **options) do
    result = from_statements(input,
      extendedRepresentation: options[:extendedRepresentation],
      useRdfType: useRdfType,
      useNativeTypes: useNativeTypes)
  end

  result = serializer.call(result, **options) if serializer
  block_given? ? yield(result) : result
end

.load_html(input, url:, library: nil, extractAllScripts: false, profile: nil, **options) ⇒ Object

Load one or more script tags from an HTML source. Unescapes and uncomments input, returns the internal representation Yields document base

Parameters:

  • input (String)
  • url (String) —

    Original URL

  • library (:nokogiri, :rexml) (defaults to: nil) —

    (nil)

  • extractAllScripts (Boolean) (defaults to: false) —

    (false)

  • profile (Boolean) (defaults to: nil) —

    (nil) Optional priortized profile when loading a single script by type.

  • options (Hash{Symbol => Object}) 


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# File 'lib/json/ld/api.rb', line 794

def self.load_html(input, url:,
                   library: nil,
                   extractAllScripts: false,
                   profile: nil,
                   **options)

  if input.is_a?(String)
    library ||= begin
      require 'nokogiri'
      :nokogiri
    rescue LoadError
      :rexml
    end
    require "json/ld/html/#{library}"

    # Parse HTML using the appropriate library
    implementation = case library
    when :nokogiri then Nokogiri
    when :rexml then REXML
    end
    extend(implementation)

    input = begin
      send("initialize_html_#{library}".to_sym, input, **options)
    rescue StandardError
      raise JSON::LD::JsonLdError::LoadingDocumentFailed, "Malformed HTML document: #{$ERROR_INFO.message}"
    end

    # Potentially update options[:base]
    if (html_base = input.at_xpath("/html/head/base/@href"))
      base = RDF::URI(url) if url
      html_base = RDF::URI(html_base)
      html_base = base.join(html_base) if base
      yield html_base
    end
  end

  url = RDF::URI.parse(url)
  if url.fragment
    id = CGI.unescape(url.fragment)
    # Find script with an ID based on that fragment.
    element = input.at_xpath("//script[@id='#{id}']")
    raise JSON::LD::JsonLdError::LoadingDocumentFailed, "No script tag found with id=#{id}" unless element

    script_type = SCRIPT_LOADERS.keys.detect {|type| element.attributes['type'].to_s.start_with?(type)}
    unless script_type
      raise JSON::LD::JsonLdError::LoadingDocumentFailed,
        "Script tag has type=#{element.attributes['type']}"
    end

    loader = SCRIPT_LOADERS[script_type]
    loader.call(element.inner_html, url: url, **options)
  elsif extractAllScripts
    res = []

    SCRIPT_LOADERS.each do |type, loader|
      elements = if profile
        es = input.xpath("//script[starts-with(@type, '#{type};profile=#{profile}')]")
        # If no profile script, just take a single script without profile
        es = [input.at_xpath("//script[starts-with(@type, '#{type}')]")].compact if es.empty?
        es
      else
        input.xpath("//script[starts-with(@type, '#{type}')]")
      end
      elements.each do |element|
        content = element.inner_html
        r = loader.call(content, url: url, extractAllScripts: true, **options)
        if r.is_a?(Hash)
          res << r
        elsif r.is_a?(Array)
          res.concat(r)
        end
      end
    end
    res
  else
    # Find the first script with a known type
    script_type, element = nil, nil
    SCRIPT_LOADERS.keys.each do |type|
      next if script_type # already found the type
      element = input.at_xpath("//script[starts-with(@type, '#{type};profile=#{profile}')]") if profile
      element ||= input.at_xpath("//script[starts-with(@type, '#{type}')]")
      script_type = type if element
    end
    unless script_type
      raise JSON::LD::JsonLdError::LoadingDocumentFailed, "No script tag found" unless element
    end

    content = element.inner_html
    SCRIPT_LOADERS[script_type].call(content, url: url, **options)
  end
rescue MultiJson::ParseError => e
  raise JSON::LD::JsonLdError::InvalidScriptElement, e.message
end

.loadRemoteDocument(url, allowed_content_types: nil, base: nil, documentLoader: nil, extractAllScripts: false, profile: nil, requestProfile: nil, validate: false, **options) {|remote_document| ... } ⇒ Object, RemoteDocument

Uses built-in or provided documentLoader to retrieve a parsed document.

Parameters:

  • url (RDF::URI, String)
  • allowed_content_types (Regexp) (defaults to: nil) —

    A regular expression matching other content types allowed beyond types for JSON and HTML.

  • base (String, RDF::URI) (defaults to: nil) —

    Location to use as documentUrl instead of url.

  • extractAllScripts (Boolean) (defaults to: false) —

    If set to true, when extracting JSON-LD script elements from HTML, unless a specific fragment identifier is targeted, extracts all encountered JSON-LD script elements using an array form, if necessary.

  • profile (String) (defaults to: nil) —

    When the resulting contentType is text/html or application/xhtml+xml, this option determines the profile to use for selecting a JSON-LD script elements.

  • requestProfile (String) (defaults to: nil) —

    One or more IRIs to use in the request as a profile parameter.

  • validate (Boolean) (defaults to: false) —

    (false) Allow only appropriate content types

  • options (Hash<Symbol => Object>)

Options Hash (**options):

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts.

Yields:

  • remote_document

Yield Parameters:

  • remote_document (RemoteDocumentRemoteDocument, RDF::Util::File::RemoteDocument)

Yield Returns:

  • (Object) —

    returned object

Returns:

  • (Object, RemoteDocument) —

    If a block is given, the result of evaluating the block is returned, otherwise, the retrieved remote document and context information unless block given

Raises:



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# File 'lib/json/ld/api.rb', line 625

def self.loadRemoteDocument(url,
                            allowed_content_types: nil,
                            base: nil,
                            documentLoader: nil,
                            extractAllScripts: false,
                            profile: nil,
                            requestProfile: nil,
                            validate: false,
                            **options)
  documentLoader ||= method(:documentLoader)
  options = OPEN_OPTS.merge(options)
  if requestProfile
    # Add any request profile
    options[:headers]['Accept'] =
      options[:headers]['Accept'].sub('application/ld+json,',
        "application/ld+json;profile=#{requestProfile}, application/ld+json;q=0.9,")
  end
  documentLoader.call(url, extractAllScripts: extractAllScripts, **options) do |remote_doc|
    case remote_doc
    when RDF::Util::File::RemoteDocument
      # Convert to RemoteDocument
      context_url = if remote_doc.content_type != 'application/ld+json' &&
                       (remote_doc.content_type == 'application/json' ||
                        remote_doc.content_type.to_s.match?(%r{application/\w+\+json}))
        # Get context link(s)
        # Note, we can't simply use #find_link, as we need to detect multiple
        links = remote_doc.links.links.select do |link|
          link.attr_pairs.include?(LINK_REL_CONTEXT)
        end
        if links.length > 1
          raise JSON::LD::JsonLdError::MultipleContextLinkHeaders,
            "expected at most 1 Link header with rel=jsonld:context, got #{links.length}"
        end
        Array(links.first).first
      end

      # If content-type is not application/ld+json, nor any other +json and a link with rel=alternate and type='application/ld+json' is found, use that instead
      alternate = !remote_doc.content_type.match?(%r{application/(\w*\+)?json}) && remote_doc.links.links.detect do |link|
        link.attr_pairs.include?(LINK_REL_ALTERNATE) &&
          link.attr_pairs.include?(LINK_TYPE_JSONLD)
      end

      remote_doc = if alternate
        # Load alternate relative to URL
        loadRemoteDocument(RDF::URI(url).join(alternate.href),
          extractAllScripts: extractAllScripts,
          profile: profile,
          requestProfile: requestProfile,
          validate: validate,
          base: base,
            **options)
      else
        RemoteDocument.new(remote_doc.read,
          documentUrl: remote_doc.base_uri,
          contentType: remote_doc.content_type,
          contextUrl: context_url)
      end
    when RemoteDocument
      # Pass through
    else
      raise JSON::LD::JsonLdError::LoadingDocumentFailed,
        "unknown result from documentLoader: #{remote_doc.class}"
    end

    # Use specified document location
    remote_doc.documentUrl = base if base

    # Parse any HTML
    if remote_doc.document.is_a?(String)
      remote_doc.document = case remote_doc.contentType
      when 'text/html', 'application/xhtml+xml'
        load_html(remote_doc.document,
          url: remote_doc.documentUrl,
          extractAllScripts: extractAllScripts,
          profile: profile,
                  **options) do |base|
          remote_doc.documentUrl = base
        end
      else
        validate_input(remote_doc.document, url: remote_doc.documentUrl) if validate
        mj_opts = options.keep_if { |k, v| k != :adapter || MUTLI_JSON_ADAPTERS.include?(v) }
        MultiJson.load(remote_doc.document, **mj_opts)
      end
    end

    if remote_doc.contentType && validate && !(remote_doc.contentType.match?(%r{application/(.+\+)?json|text/html|application/xhtml\+xml}) ||
        (allowed_content_types && remote_doc.contentType.match?(allowed_content_types)))
      raise IOError, "url: #{url}, contentType: #{remote_doc.contentType}"
    end

    block_given? ? yield(remote_doc) : remote_doc
  end
rescue IOError, MultiJson::ParseError => e
  raise JSON::LD::JsonLdError::LoadingDocumentFailed, e.message
end

.serializer(object, *_args, **options) ⇒ Object

The default serializer for serialzing Ruby Objects to JSON.

Defaults to MultiJson.dump

Parameters:

  • object (Object)
  • args (Array<Object>) —

    other arguments that may be passed for some specific implementation.

  • options (Hash<Symbol, Object>) —

    options passed from the invoking context.

Options Hash (**options):

  • :serializer_opts (Object) — default: JSON_STATE 


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# File 'lib/json/ld/api.rb', line 900

def self.serializer(object, *_args, **options)
  serializer_opts = options.fetch(:serializer_opts, JSON_STATE)
  MultiJson.dump(object, serializer_opts)
end

.toRdf(input, expanded: false, **options) {|statement| ... } ⇒ RDF::Enumerable Also known as: toRDF

Processes the input according to the RDF Conversion Algorithm, calling the provided callback for each triple generated.

Parameters:

  • input (String, #read, Hash, Array) —

    The JSON-LD object to process when outputting statements.

  • expanded (Boolean) (defaults to: false) —

    (false) Input is already expanded

  • options (Hash) —

    a customizable set of options

Options Hash (**options):

  • :produceGeneralizedRdf (Boolean) — default: false —

    If true, output will include statements having blank node predicates, otherwise they are dropped.

  • :extractAllScripts (Boolean) — default: true —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :adapter (Symbol) —

    used with MultiJson

  • :base (RDF::URI, String, #to_s) —

    The Base IRI to use when expanding the document. This overrides the value of input if it is a IRI. If not specified and input is not an IRI, the base IRI defaults to the current document IRI if in a browser context, or the empty string if there is no document context. If not specified, and a base IRI is found from input, options will be modified with this value.

  • :compactArrays (Boolean) — default: true —

    If set to true, the JSON-LD processor replaces arrays with just one element with that element during compaction. If set to false, all arrays will remain arrays even if they have just one element.

  • :compactToRelative (Boolean) — default: true —

    Creates document relative IRIs when compacting, if true, otherwise leaves expanded.

  • :documentLoader (Proc) —

    The callback of the loader to be used to retrieve remote documents and contexts. If specified, it must be used to retrieve remote documents and contexts; otherwise, if not specified, the processor’s built-in loader must be used. See documentLoader for the method signature.

  • :expandContext (String, #read, Hash, Array, JSON::LD::Context) —

    A context that is used to initialize the active context when expanding a document.

  • :extendedRepresentation (Boolean) — default: false —

    Use the extended internal representation.

  • :extractAllScripts (Boolean) —

    If set, when given an HTML input without a fragment identifier, extracts all script elements with type application/ld+json into an array during expansion.

  • :flatten (Boolean, String, RDF::URI) —

    If set to a value that is not false, the JSON-LD processor must modify the output of the Compaction Algorithm or the Expansion Algorithm by coalescing all properties associated with each subject via the Flattening Algorithm. The value of flatten must be either an IRI value representing the name of the graph to flatten, or true. If the value is true, then the first graph encountered in the input document is selected and flattened.

  • :language (String) —

    When set, this has the effect of inserting a context definition with @language set to the associated value, creating a default language for interpreting string values.

  • :library (Symbol) —

    One of :nokogiri or :rexml. If nil/unspecified uses :nokogiri if available, :rexml otherwise.

  • :lowercaseLanguage (Boolean) —

    By default, language tags are left as is. To normalize to lowercase, set this option to true.

  • :ordered (Boolean) — default: true —

    Order traversal of dictionary members by key when performing algorithms.

  • :processingMode (String) —

    Processing mode, json-ld-1.0 or json-ld-1.1.

  • :rdfstar (Boolean) — default: false —

    support parsing JSON-LD-star statement resources.

  • :rename_bnodes (Boolean) — default: true —

    Rename bnodes as part of expansion, or keep them the same.

  • :unique_bnodes (Boolean) — default: false —

    Use unique bnode identifiers, defaults to using the identifier which the node was originally initialized with (if any).

  • :validate (Boolean) —

    Validate input, if a string or readable object.

Yields:

  • statement

Yield Parameters:

Returns:

  • (RDF::Enumerable) —

    set of statements, unless a block is given.

Raises:



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# File 'lib/json/ld/api.rb', line 526

def self.toRdf(input, expanded: false, **options)
  unless block_given?
    results = []
    results.extend(RDF::Enumerable)
    toRdf(input, expanded: expanded, **options) do |stmt|
      results << stmt
    end
    return results
  end

  options = {
    extractAllScripts: true
  }.merge(options)

  # Flatten input to simplify processing
  flattened_input = API.flatten(input, nil, expanded: expanded, ordered: false, **options)

  API.new(flattened_input, nil, **options) do
    # 1) Perform the Expansion Algorithm on the JSON-LD input.
    #    This removes any existing context to allow the given context to be cleanly applied.
    # log_debug(".toRdf") {"flattened input: #{flattened_input.to_json(JSON_STATE) rescue 'malformed json'}"}

    # Recurse through input
    flattened_input.each do |node|
      item_to_rdf(node) do |statement|
        next if statement.predicate.node? && !options[:produceGeneralizedRdf]

        # Drop invalid statements (other than IRIs)
        unless statement.valid_extended?
          # log_debug(".toRdf") {"drop invalid statement: #{statement.to_nquads}"}
          next
        end

        yield statement
      end
    end
  end
end

.validate_input(input, url:) ⇒ Object

Validate JSON using JsonLint, if loaded



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# File 'lib/json/ld/api.rb', line 908

def self.validate_input(input, url:)
  return unless defined?(JsonLint)

  jsonlint = JsonLint::Linter.new
  input = StringIO.new(input) unless input.respond_to?(:read)
  unless jsonlint.check_stream(input)
    raise JsonLdError::LoadingDocumentFailed, "url: #{url}\n" + jsonlint.errors[''].join("\n")
  end

  input.rewind
end