module RDF::TriG::StreamingWriter

Streaming writer interface @author [Gregg Kellogg](greggkellogg.net/)

Public Instance Methods

stream_epilogue() click to toggle source

Complete open statements @return [void] ‘self`

# File lib/rdf/trig/streaming_writer.rb, line 38
def stream_epilogue
  case
  when @previous_statement.nil? ;
  when @streaming_graph then @output.puts " }"
  else @output.puts " ."
  end
end
stream_statement(statement) click to toggle source

Write out a statement, retaining current ‘subject` and `predicate` to create more compact output @return [void] `self`

# File lib/rdf/trig/streaming_writer.rb, line 10
def stream_statement(statement)
  if statement.graph_name != @streaming_graph
    stream_epilogue
    if statement.graph_name
      @output.write "#{format_term(statement.graph_name, **options)} {"
    end
    @streaming_graph, @streaming_subject, @streaming_predicate = statement.graph_name, statement.subject, statement.predicate
    @output.write "#{format_term(statement.subject, **options)} "
    @output.write "#{statement.predicate == RDF.type ? 'a' : format_term(statement.predicate, **options)} "
  elsif statement.subject != @streaming_subject
    @output.puts " ." if @previous_statement
    @output.write "#{indent(@streaming_subject ? 1 : 0)}"
    @streaming_subject, @streaming_predicate = statement.subject, statement.predicate
    @output.write "#{format_term(statement.subject, **options)} "
    @output.write "#{statement.predicate == RDF.type ? 'a' : format_term(statement.predicate, **options)} "
  elsif statement.predicate != @streaming_predicate
    @streaming_predicate = statement.predicate
    @output.write ";\n#{indent(@streaming_subject ? 2 : 1)}#{statement.predicate == RDF.type ? 'a' : format_term(statement.predicate, **options)} "
  else
    @output.write ",\n#{indent(@streaming_subject ? 3 : 2)}"
  end
  @output.write("#{format_term(statement.object, **options)}")
  @previous_statement = statement
end