Method: Brevity::Note#_nt_polyphonic_note

Defined in:

lib/brevity/parsing/note/note.rb

#_nt_polyphonic_note ⇒ Object

# File 'lib/brevity/parsing/note/note.rb', line 170

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

  i0, s0 = index, []
  r1 = _nt_duration
  s0 << r1
  if r1
    r2 = _nt_pitch_link
    s0 << r2
    if r2
      s3, i3 = [], index
      loop do
        i4, s4 = index, []
        if (match_len = has_terminal?(",", false, index))
          r5 = true
          @index += match_len
        else
          terminal_parse_failure(",")
          r5 = nil
        end
        s4 << r5
        if r5
          r6 = _nt_pitch_link
          s4 << r6
        end
        if s4.last
          r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
          r4.extend(PolyphonicNote0)
        else
          @index = i4
          r4 = nil
        end
        if r4
          s3 << r4
        else
          break
        end
      end
      if s3.empty?
        @index = i3
        r3 = nil
      else
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
      end
      s0 << r3
      if r3
        r8 = _nt_accent
        if r8
          r7 = r8
        else
          r7 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r7
      end
    end
  end
  if s0.last
    r0 = instantiate_node(PolyphonicNoteNode,input, i0...index, s0)
    r0.extend(PolyphonicNote1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:polyphonic_note][start_index] = r0

  r0
end