Module: RDF::TriG::StreamingWriter

Included in:
Writer
Defined in:
lib/rdf/trig/streaming_writer.rb

Overview

Streaming writer interface

Author:

Instance Method Summary collapse

Instance Method Details

#stream_epilogue ⇒ void

This method returns an undefined value.

Complete open statements



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# 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) ⇒ void

This method returns an undefined value.

Write out a statement, retaining current ‘subject` and `predicate` to create more compact output



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# 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