Method: Music::Transcription::Parsing::Pitch#_nt_letter_g

Defined in:

lib/music-transcription/parsing/pitch_parsing.rb

#_nt_letter_g ⇒ Object

# File 'lib/music-transcription/parsing/pitch_parsing.rb', line 416

def _nt_letter_g
  start_index = index
  if node_cache[:letter_g].has_key?(index)
    cached = node_cache[:letter_g][index]
    if cached
      node_cache[:letter_g][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if has_terminal?(@regexps[gr = '\A[Gg]'] ||= Regexp.new(gr), :regexp, index)
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    r0.extend(LetterG0)
    @index += 1
  else
    terminal_parse_failure('[Gg]')
    r0 = nil
  end

  node_cache[:letter_g][start_index] = r0

  r0
end