Class: JSON::LD::Format

Inherits:
RDF::Format
  • Object
show all
Defined in:
lib/json/ld/format.rb

Overview

JSON-LD format specification.

Examples:

Obtaining an JSON-LD format class

RDF::Format.for(:jsonld)           #=> JSON::LD::Format
RDF::Format.for("etc/foaf.jsonld")
RDF::Format.for(:file_name         => "etc/foaf.jsonld")
RDF::Format.for(file_extension: "jsonld")
RDF::Format.for(:content_type   => "application/ld+json")

Obtaining serialization format MIME types

RDF::Format.content_types      #=> {"application/ld+json" => [JSON::LD::Format],
                                    "application/x-ld+json" => [JSON::LD::Format]}

Obtaining serialization format file extension mappings

RDF::Format.file_extensions    #=> {:jsonld => [JSON::LD::Format] }

See Also:

Class Method Summary collapse

Class Method Details

.cli_commands ⇒ Hash{Symbol => Hash}

Hash of CLI commands appropriate for this format

Returns:

  • (Hash{Symbol => Hash}) 


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# File 'lib/json/ld/format.rb', line 50

def self.cli_commands
  {
    expand: {
      description: "Expand JSON-LD or parsed RDF",
      parse: false,
      help: "expand [--context <context-file>] files ...",
      lambda: ->(files, options) do
        out = options[:output] || $stdout
        out.set_encoding(Encoding::UTF_8) if RUBY_PLATFORM == "java"
        options = options.merge(expandContext: options.delete(:context)) if options.has_key?(:context)
        if options[:format] == :jsonld
          if files.empty?
            # If files are empty, either use options[:execute]
            input = options[:evaluate] ? StringIO.new(options[:evaluate]) : STDIN
            input.set_encoding(options.fetch(:encoding, Encoding::UTF_8))
            JSON::LD::API.expand(input, options.merge(validate: false)) do |expanded|
              out.puts expanded.to_json(JSON::LD::JSON_STATE)
            end
          else
            files.each do |file|
              JSON::LD::API.expand(file, options.merge(validate: false)) do |expanded|
                out.puts expanded.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        else
          # Turn RDF into JSON-LD first
          RDF::CLI.parse(files, options) do |reader|
            JSON::LD::API.fromRdf(reader) do |expanded|
              out.puts expanded.to_json(JSON::LD::JSON_STATE)
            end
          end
        end
      end
    },
    compact: {
      description: "Compact JSON-LD or parsed RDF",
      parse: false,
      help: "compact --context <context-file> files ...",
      lambda: ->(files, options) do
        raise ArgumentError, "Compacting requires a context" unless options[:context]
        out = options[:output] || $stdout
        out.set_encoding(Encoding::UTF_8) if RUBY_PLATFORM == "java"
        if options[:format] == :jsonld
          if files.empty?
            # If files are empty, either use options[:execute]
            input = options[:evaluate] ? StringIO.new(options[:evaluate]) : STDIN
            input.set_encoding(options.fetch(:encoding, Encoding::UTF_8))
            JSON::LD::API.compact(input, options[:context], options) do |compacted|
              out.puts compacted.to_json(JSON::LD::JSON_STATE)
            end
          else
            files.each do |file|
              JSON::LD::API.compact(file, options[:context], options) do |compacted|
                out.puts compacted.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        else
          # Turn RDF into JSON-LD first
          RDF::CLI.parse(files, options) do |reader|
            JSON::LD::API.fromRdf(reader) do |expanded|
              JSON::LD::API.compact(expanded, options[:context], options) do |compacted|
                out.puts compacted.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        end
      end
    },
    flatten: {
      description: "Flatten JSON-LD or parsed RDF",
      parse: false,
      help: "flatten [--context <context-file>] files ...",
      lambda: ->(files, options) do
        out = options[:output] || $stdout
        out.set_encoding(Encoding::UTF_8) if RUBY_PLATFORM == "java"
        if options[:format] == :jsonld
          if files.empty?
            # If files are empty, either use options[:execute]
            input = options[:evaluate] ? StringIO.new(options[:evaluate]) : STDIN
            input.set_encoding(options.fetch(:encoding, Encoding::UTF_8))
            JSON::LD::API.flatten(input, options[:context], options) do |flattened|
              out.puts flattened.to_json(JSON::LD::JSON_STATE)
            end
          else
            files.each do |file|
              JSON::LD::API.flatten(file, options[:context], options) do |flattened|
                out.puts flattened.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        else
          # Turn RDF into JSON-LD first
          RDF::CLI.parse(files, options) do |reader|
            JSON::LD::API.fromRdf(reader) do |expanded|
              JSON::LD::API.flatten(expanded, options[:context], options) do |flattened|
                out.puts flattened.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        end
      end
    },
    frame: {
      description: "Frame JSON-LD or parsed RDF",
      parse: false,
      help: "frame --frame <frame-file>  files ...",
      lambda: ->(files, options) do
        raise ArgumentError, "Framing requires a frame" unless options[:frame]
        out = options[:output] || $stdout
        out.set_encoding(Encoding::UTF_8) if RUBY_PLATFORM == "java"
        if options[:format] == :jsonld
          if files.empty?
            # If files are empty, either use options[:execute]
            input = options[:evaluate] ? StringIO.new(options[:evaluate]) : STDIN
            input.set_encoding(options.fetch(:encoding, Encoding::UTF_8))
            JSON::LD::API.frame(input, options[:frame], options) do |framed|
              out.puts framed.to_json(JSON::LD::JSON_STATE)
            end
          else
            files.each do |file|
              JSON::LD::API.frame(file, options[:frame], options) do |framed|
                out.puts framed.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        else
          # Turn RDF into JSON-LD first
          RDF::CLI.parse(files, options) do |reader|
            JSON::LD::API.fromRdf(reader) do |expanded|
              JSON::LD::API.frame(expanded, options[:frame], options) do |framed|
                out.puts framed.to_json(JSON::LD::JSON_STATE)
              end
            end
          end
        end
      end
    },
  }
end

.detect(sample) ⇒ Boolean

Sample detection to see if it matches JSON-LD

Use a text sample to detect the format of an input file. Sub-classes implement a matcher sufficient to detect probably format matches, including disambiguating between other similar formats.

Parameters:

  • sample (String) —

    Beginning several bytes (~ 1K) of input.

Returns:

  • (Boolean) 


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# File 'lib/json/ld/format.rb', line 41

def self.detect(sample)
  !!sample.match(/\{\s*"@(id|context|type)"/m) &&
    # Exclude CSVW metadata
    !sample.include?("http://www.w3.org/ns/csvw")
end

.name ⇒ Object

Override normal format name



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# File 'lib/json/ld/format.rb', line 200

def self.name
  "JSON-LD"
end

.to_sym ⇒ Object

Override normal symbol generation



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# File 'lib/json/ld/format.rb', line 194

def self.to_sym
  :jsonld
end