Class: RDF::TriG::Reader

Inherits:
RDF::Turtle::Reader show all
Defined in:
vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb

Overview

A parser for the TriG

Leverages the Turtle reader

Constant Summary

Constants included from RDF::Turtle::Terminals

RDF::Turtle::Terminals::ANON, RDF::Turtle::Terminals::BASE, RDF::Turtle::Terminals::BLANK_NODE_LABEL, RDF::Turtle::Terminals::DECIMAL, RDF::Turtle::Terminals::DOUBLE, RDF::Turtle::Terminals::ECHAR, RDF::Turtle::Terminals::EXPONENT, RDF::Turtle::Terminals::INTEGER, RDF::Turtle::Terminals::IRIREF, RDF::Turtle::Terminals::IRI_RANGE, RDF::Turtle::Terminals::LANGTAG, RDF::Turtle::Terminals::PERCENT, RDF::Turtle::Terminals::PLX, RDF::Turtle::Terminals::PNAME_LN, RDF::Turtle::Terminals::PNAME_NS, RDF::Turtle::Terminals::PN_CHARS, RDF::Turtle::Terminals::PN_CHARS_BASE, RDF::Turtle::Terminals::PN_CHARS_BODY, RDF::Turtle::Terminals::PN_CHARS_U, RDF::Turtle::Terminals::PN_LOCAL, RDF::Turtle::Terminals::PN_LOCAL_BODY, RDF::Turtle::Terminals::PN_LOCAL_ESC, RDF::Turtle::Terminals::PN_PREFIX, RDF::Turtle::Terminals::PREFIX, RDF::Turtle::Terminals::STRING_LITERAL_LONG_QUOTE, RDF::Turtle::Terminals::STRING_LITERAL_LONG_SINGLE_QUOTE, RDF::Turtle::Terminals::STRING_LITERAL_QUOTE, RDF::Turtle::Terminals::STRING_LITERAL_SINGLE_QUOTE, RDF::Turtle::Terminals::UCHAR, RDF::Turtle::Terminals::U_CHARS1, RDF::Turtle::Terminals::U_CHARS2, RDF::Turtle::Terminals::WS

Instance Attribute Summary

Attributes inherited from Reader

#options

Instance Method Summary collapse

Methods inherited from RDF::Turtle::Reader

#bnode, #each_triple, #error, #initialize, #inspect, #literal, options, #pname, #prefix, #process_iri, #prod, #read_BlankNode, #read_blankNodePropertyList, #read_collection, #read_directive, #read_iri, #read_literal, #read_object, #read_objectList, #read_predicateObjectList, #read_statement, #read_subject, #read_triples, #read_verb

Methods included from Util::Logger

#log_debug, #log_depth, #log_error, #log_fatal, #log_info, #log_recover, #log_recovering?, #log_statistics, #log_warn, #logger

Methods inherited from Reader

#base_uri, #canonicalize?, #close, each, #each_triple, #encoding, #fail_object, #fail_predicate, #fail_subject, for, format, #initialize, #intern?, #lineno, open, options, #prefix, #prefixes, #prefixes=, #read_statement, #read_triple, #rewind, #to_sym, to_sym, #valid?, #validate?

Methods included from Util::Aliasing::LateBound

#alias_method

Methods included from Enumerable

add_entailment, #dump, #each_graph, #each_object, #each_predicate, #each_subject, #each_term, #each_triple, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph_names, #has_graph?, #has_object?, #has_predicate?, #has_quad?, #has_statement?, #has_subject?, #has_term?, #has_triple?, #invalid?, #method_missing, #objects, #predicates, #project_graph, #quads, #respond_to_missing?, #statements, #subjects, #supports?, #terms, #to_a, #to_h, #to_set, #triples, #valid?, #validate!

Methods included from Isomorphic

#bijection_to, #isomorphic_with?

Methods included from Countable

#count, #empty?

Methods included from Readable

#readable?

Constructor Details

This class inherits a constructor from RDF::Turtle::Reader

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Enumerable

Instance Method Details

#add_statement(production, statement) ⇒ RDF::Statement

add a statement, object can be literal or URI or bnode

Parameters:

Returns:

Raises:

  • (RDF::ReaderError)

    Checks parameter types and raises if they are incorrect if parsing mode is validate.



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 83

def add_statement(production, statement)
  error("Statement is invalid: #{statement.inspect.inspect}", production: produciton) if validate? && statement.invalid?
  statement.graph_name = @graph_name if @graph_name
  @callback.call(statement) if statement.subject &&
                               statement.predicate &&
                               statement.object &&
                               (validate? ? statement.valid? : true)
end

#each_quad {|subject, predicate, object, graph_name| ... }

This method returns an undefined value.

Iterates the given block for each RDF quad in the input.

Yields:

  • (subject, predicate, object, graph_name)

Yield Parameters:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 68

def each_quad(&block)
  if block_given?
    each_statement do |statement|
      block.call(*statement.to_quad)
    end
  end
  enum_for(:each_quad)
end

#each_statement {|statement| ... }

This method returns an undefined value.

Iterates the given block for each RDF statement in the input.

Yields:

  • (statement)

Yield Parameters:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 39

def each_statement(&block)
  if block_given?
    @recovering = false
    @callback = block

    begin
      while (@lexer.first rescue true)
        read_trigDoc
      end
    rescue EBNF::LL1::Lexer::Error, SyntaxError, EOFError, Recovery
      # Terminate loop if EOF found while recovering
    end

    if validate? && log_statistics[:error]
      raise RDF::ReaderError, "Errors found during processing"
    end
  end
  enum_for(:each_statement)
end

#read_blockObject (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 101

def read_block
  prod(:block, %(})) do
    @graph_name = nil
    token = @lexer.first
    case token && (token.type || token.value)
    when :GRAPH
      @lexer.shift
      @graph_name = read_labelOrSubject || error("Expected label or subject", production: :block, token: @lexer.first)
      read_wrappedGraph || error("Expected wrappedGraph", production: :block, token: @lexer.first)
      @graph_name = nil
    when :IRIREF, :BLANK_NODE_LABEL, :ANON, :PNAME_LN, :PNAME_NS
      read_triplesOrGraph || error("Expected triplesOrGraph", production: :block, token: @lexer.first)
    when '{'
      read_wrappedGraph || error("Expected wrappedGraph", production: :block, token: @lexer.first)
    when '(', '['
      read_triples2 || error("Expected collection or blankNodePropertyList", production: :block, token: @lexer.first)
    when nil
      # End of input
    else
      error("Unexpected token: #{@lexer.first.inspect}", production: :block, token: @lexer.first)
    end
  end
end

#read_labelOrSubjectRDF::Resource (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 223

def read_labelOrSubject
  prod(:labelOrSubject) do
    read_iri || read_BlankNode
  end
end

#read_trigDocObject (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 94

def read_trigDoc
  prod(:trigDoc, %(} .)) do
    read_directive || read_block
  end
end

#read_triples2Object (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 152

def read_triples2
  token = @lexer.first
  case token && token.value
  when '['
    prod(:triples2) do
      # blankNodePropertyList predicateObjectList? 
      subject = read_blankNodePropertyList || error("Failed to parse blankNodePropertyList", production: :triples2, token: @lexer.first)
      read_predicateObjectList(subject)
      if !@recovering || @lexer.first === '.'
        # If recovering, we will have eaten the closing '.'
        token = @lexer.shift
        unless token && token.value == '.'
          error("Expected '.' following triple", production: :triples2, token: token)
        end
      end
      true
    end
  when '('
    prod(:triples2) do
      subject = read_collection || error("Failed to parse read_collection", production: :triples2, token: @lexer.first)
      token = @lexer.first
      case token && (token.type || token.value)
      when 'a', :IRIREF, :PNAME_LN, :PNAME_NS then read_predicateObjectList(subject)
      else error("Expected predicateObjectList after collection subject", production: :triples2, token: token)
      end
      if !@recovering || @lexer.first === '.'
        # If recovering, we will have eaten the closing '.'
        token = @lexer.shift
        unless token && token.value == '.'
          error("Expected '.' following triple", production: :triples2, token: token)
        end
      end
      true
    end
  end
end

#read_triplesBlockObject (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 211

def read_triplesBlock
  prod(:triplesBlock, %w(.)) do
    while (token = @lexer.first) && token.value != '}' && read_triples
      unless log_recovering?
        break unless @lexer.first === '.'
        @lexer.shift
      end
    end
  end
end

#read_triplesOrGraphObject (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 126

def read_triplesOrGraph
  while name = read_labelOrSubject
    prod(:triplesOrGraph, %(} .)) do
      token = @lexer.first
      case token && token.value
      when '{'
        @graph_name = name
        read_wrappedGraph || error("Expected wrappedGraph", production: :triplesOrGraph, token: @lexer.first)
        @graph_name = nil
        true
      else
        read_predicateObjectList(name) || error("Expected predicateObjectList", production: :triplesOrGraph, token: @lexer.first)
        unless @recovering
          # If recovering, we will have eaten the closing '.'
          token = @lexer.shift
          unless token && token.value == '.'
            error("Expected '.' following triple", production: :triplesOrGraph, token: token)
          end
        end
      end
    end
  end
  true
end

#read_wrappedGraphObject (protected)

Returns:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/rdf-trig-b2bcf1b9c9ab/lib/rdf/trig/reader.rb', line 190

def read_wrappedGraph
  token = @lexer.first
  if token && token.value == '{'
    prod(:wrappedGraph, %w(})) do
      @lexer.shift
      while read_triplesBlock
        # Read until nothing found
      end
      if !@recovering || @lexer.first === '}'
        # If recovering, we will have eaten the closing '}'
        token = @lexer.shift
        unless token && token.value == '}'
          error("Expected '}' following triple", production: :wrappedGraph, token: token)
        end
      end
      true
    end
  end
end