Class: JSON::LD::Reader

Inherits:
RDF::Reader
  • Object
show all
Defined in:
lib/json/ld/reader.rb

Overview

A JSON-LD parser in Ruby.

See Also:

Author:

Instance Method Summary collapse

Constructor Details

#initialize(input = $stdin, options = {}) {|reader| ... } ⇒ Reader

Initializes the RDF/JSON reader instance.

Parameters:

  • input (IO, File, String) (defaults to: $stdin)
  • options (Hash{Symbol => Object}) (defaults to: {}) —

    any additional options (see ‘RDF::Reader#initialize` and API.initialize)

Yields:

  • (reader) —

    ‘self`

Yield Parameters:

  • reader (RDF::Reader)

Yield Returns:

  • (void) —

    ignored

Raises:

  • (RDF::ReaderError) —

    if the JSON document cannot be loaded



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# File 'lib/json/ld/reader.rb', line 20

def initialize(input = $stdin, options = {}, &block)
  options[:base_uri] ||= options[:base]
  super do
    @options[:base] ||= base_uri.to_s if base_uri
    begin
      # Trim non-JSON stuff in script.
      @doc = if input.respond_to?(:read)
        input
      else
        StringIO.new(input.to_s.sub(%r(\A[^{\[]*)m, '').sub(%r([^}\]]*\Z)m, ''))
      end
    rescue JSON::ParserError => e
      raise RDF::ReaderError, "Failed to parse input document: #{e.message}" if validate?
      @doc = StringIO.new("{}")
    end

    if block_given?
      case block.arity
        when 0 then instance_eval(&block)
        else block.call(self)
      end
    end
  end
end

Instance Method Details

#each_statement(&block) ⇒ Object

See Also:

  • RDF::Reader#each_statement


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# File 'lib/json/ld/reader.rb', line 48

def each_statement(&block)
  JSON::LD::API.toRdf(@doc, @options, &block)
rescue ::JSON::LD::JsonLdError => e
  raise RDF::ReaderError, e.message
end

#each_triple(&block) ⇒ Object

See Also:

  • RDF::Reader#each_triple


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# File 'lib/json/ld/reader.rb', line 57

def each_triple(&block)
  if block_given?
    JSON::LD::API.toRdf(@doc, @options) do |statement|
      yield *statement.to_triple
    end
  end
  enum_for(:each_triple)
end