Module: Treetop::Compiler::Metagrammar

Includes:
Runtime
Included in:
MetagrammarParser
Defined in:
lib/treetop/compiler/metagrammar.rb

Defined Under Namespace

Modules: CharacterClass0, CharacterClass1, CharacterClass2, CharacterClass3, CharacterClass4, Choice0, Choice1, Choice2, CommentToEol0, CommentToEol1, DeclarationSequence0, DeclarationSequence1, DeclarationSequence2, DeclarationSequence3, DoubleQuotedString0, DoubleQuotedString1, Grammar0, Grammar1, GrammarName0, IncludeDeclaration0, IncludeDeclaration1, InlineModule0, InlineModule1, KeywordInsideGrammar0, Label0, Label1, Label2, Label3, LabeledSequencePrimary0, LabeledSequencePrimary1, ModuleDeclaration0, ModuleDeclaration1, ModuleDeclaration2, ModuleDeclaration3, NestedParensInRegex0, NodeClassDeclarations0, NodeClassDeclarations1, NodeClassExpression0, NodeClassExpression1, NodeClassExpression2, NodeClassExpression3, NonSpaceChar0, Nonterminal0, Nonterminal1, ParenthesizedExpression0, ParenthesizedExpression1, ParsingRule0, ParsingRule1, PredicateBlock0, Primary0, Primary1, Primary2, Primary3, Primary4, Primary5, Primary6, Primary7, QuotedString0, Regex0, Regex1, RequireStatement0, Sequence0, Sequence1, Sequence2, SequencePrimary0, SequencePrimary1, SequencePrimary2, SequencePrimary3, SequencePrimary4, SequencePrimary5, SingleQuotedString0, SingleQuotedString1, TrailingInlineModule0, TrailingInlineModule1, TrailingInlineModule2, TreetopFile0, TreetopFile1, TreetopFile2

Instance Method Summary collapse

Instance Method Details

#_nt_alpha_char ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3191

def _nt_alpha_char
  start_index = index
  if node_cache[:alpha_char].has_key?(index)
    cached = node_cache[:alpha_char][index]
    @index = cached.interval.end if cached
    return cached
  end

  if has_terminal?('\G[A-Za-z_]', true, index)
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    r0 = nil
  end

  node_cache[:alpha_char][start_index] = r0

  r0
end

#_nt_alphanumeric_char ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3211

def _nt_alphanumeric_char
  start_index = index
  if node_cache[:alphanumeric_char].has_key?(index)
    cached = node_cache[:alphanumeric_char][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_alpha_char
  if r1
    r0 = r1
  else
    if has_terminal?('\G[0-9]', true, index)
      r2 = true
      @index += 1
    else
      r2 = nil
    end
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:alphanumeric_char][start_index] = r0

  r0
end

#_nt_alternative ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1119

def _nt_alternative
  start_index = index
  if node_cache[:alternative].has_key?(index)
    cached = node_cache[:alternative][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_sequence
  if r1
    r0 = r1
  else
    r2 = _nt_primary
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:alternative][start_index] = r0

  r0
end

#_nt_anything_symbol ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2704

def _nt_anything_symbol
  start_index = index
  if node_cache[:anything_symbol].has_key?(index)
    cached = node_cache[:anything_symbol][index]
    @index = cached.interval.end if cached
    return cached
  end

  if has_terminal?('.', false, index)
    r0 = instantiate_node(AnythingSymbol,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('.')
    r0 = nil
  end

  node_cache[:anything_symbol][start_index] = r0

  r0
end

#_nt_atomic ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1883

def _nt_atomic
  start_index = index
  if node_cache[:atomic].has_key?(index)
    cached = node_cache[:atomic][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_regex
  if r1
    r0 = r1
  else
    r2 = _nt_terminal
    if r2
      r0 = r2
    else
      r3 = _nt_nonterminal
      if r3
        r0 = r3
      else
        r4 = _nt_parenthesized_expression
        if r4
          r0 = r4
        else
          @index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:atomic][start_index] = r0

  r0
end

#_nt_character_class ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2550

def _nt_character_class
  start_index = index
  if node_cache[:character_class].has_key?(index)
    cached = node_cache[:character_class][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('[', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('[')
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      i4 = index
      if has_terminal?(']', false, index)
        r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure(']')
        r5 = nil
      end
      if r5
        r4 = nil
      else
        @index = i4
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        i6 = index
        i7, s7 = index, []
        if has_terminal?('\\', false, index)
          r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure('\\')
          r8 = nil
        end
        s7 << r8
        if r8
          if index < input_length
            r9 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure("any character")
            r9 = nil
          end
          s7 << r9
        end
        if s7.last
          r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
          r7.extend(CharacterClass0)
        else
          @index = i7
          r7 = nil
        end
        if r7
          r6 = r7
        else
          i10, s10 = index, []
          i11 = index
          if has_terminal?('\\', false, index)
            r12 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure('\\')
            r12 = nil
          end
          if r12
            r11 = nil
          else
            @index = i11
            r11 = instantiate_node(SyntaxNode,input, index...index)
          end
          s10 << r11
          if r11
            if index < input_length
              r13 = instantiate_node(SyntaxNode,input, index...(index + 1))
              @index += 1
            else
              terminal_parse_failure("any character")
              r13 = nil
            end
            s10 << r13
          end
          if s10.last
            r10 = instantiate_node(SyntaxNode,input, i10...index, s10)
            r10.extend(CharacterClass1)
          else
            @index = i10
            r10 = nil
          end
          if r10
            r6 = r10
          else
            @index = i6
            r6 = nil
          end
        end
        s3 << r6
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(CharacterClass2)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    if s2.empty?
      @index = i2
      r2 = nil
    else
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    end
    s0 << r2
    if r2
      if has_terminal?(']', false, index)
        r14 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure(']')
        r14 = nil
      end
      s0 << r14
    end
  end
  if s0.last
    r0 = instantiate_node(CharacterClass,input, i0...index, s0)
    r0.extend(CharacterClass3)
    r0.extend(CharacterClass4)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:character_class][start_index] = r0

  r0
end

#_nt_choice ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 935

def _nt_choice
  start_index = index
  if node_cache[:choice].has_key?(index)
    cached = node_cache[:choice][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_alternative
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      r5 = _nt_space
      if r5
        r4 = r5
      else
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        if has_terminal?('/', false, index)
          r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure('/')
          r6 = nil
        end
        s3 << r6
        if r6
          r8 = _nt_space
          if r8
            r7 = r8
          else
            r7 = instantiate_node(SyntaxNode,input, index...index)
          end
          s3 << r7
          if r7
            r9 = _nt_alternative
            s3 << r9
          end
        end
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(Choice0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    if s2.empty?
      @index = i2
      r2 = nil
    else
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    end
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(Choice,input, i0...index, s0)
    r0.extend(Choice1)
    r0.extend(Choice2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:choice][start_index] = r0

  r0
end

#_nt_comment_to_eol ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3290

def _nt_comment_to_eol
  start_index = index
  if node_cache[:comment_to_eol].has_key?(index)
    cached = node_cache[:comment_to_eol][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('#', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('#')
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      i4 = index
      if has_terminal?("\n", false, index)
        r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("\n")
        r5 = nil
      end
      if r5
        r4 = nil
      else
        @index = i4
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        if index < input_length
          r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("any character")
          r6 = nil
        end
        s3 << r6
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(CommentToEol0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(CommentToEol1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:comment_to_eol][start_index] = r0

  r0
end

#_nt_declaration ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 641

def _nt_declaration
  start_index = index
  if node_cache[:declaration].has_key?(index)
    cached = node_cache[:declaration][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_parsing_rule
  if r1
    r0 = r1
  else
    r2 = _nt_include_declaration
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:declaration][start_index] = r0

  r0
end

#_nt_declaration_sequence ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 571

def _nt_declaration_sequence
  start_index = index
  if node_cache[:declaration_sequence].has_key?(index)
    cached = node_cache[:declaration_sequence][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_declaration
  s1 << r2
  if r2
    s3, i3 = [], index
    loop do
      i4, s4 = index, []
      r5 = _nt_space
      s4 << r5
      if r5
        r6 = _nt_declaration
        s4 << r6
      end
      if s4.last
        r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
        r4.extend(DeclarationSequence0)
      else
        @index = i4
        r4 = nil
      end
      if r4
        s3 << r4
      else
        break
      end
    end
    r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
    s1 << r3
  end
  if s1.last
    r1 = instantiate_node(DeclarationSequence,input, i1...index, s1)
    r1.extend(DeclarationSequence1)
    r1.extend(DeclarationSequence2)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('', false, index)
      r7 = instantiate_node(SyntaxNode,input, index...(index + 0))
      r7.extend(DeclarationSequence3)
      @index += 0
    else
      terminal_parse_failure('')
      r7 = nil
    end
    if r7
      r0 = r7
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:declaration_sequence][start_index] = r0

  r0
end

#_nt_double_quoted_string ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2290

def _nt_double_quoted_string
  start_index = index
  if node_cache[:double_quoted_string].has_key?(index)
    cached = node_cache[:double_quoted_string][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('"', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('"')
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      i4 = index
      if has_terminal?('"', false, index)
        r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure('"')
        r5 = nil
      end
      if r5
        r4 = nil
      else
        @index = i4
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        i6 = index
        if has_terminal?("\\\\", false, index)
          r7 = instantiate_node(SyntaxNode,input, index...(index + 2))
          @index += 2
        else
          terminal_parse_failure("\\\\")
          r7 = nil
        end
        if r7
          r6 = r7
        else
          if has_terminal?('\"', false, index)
            r8 = instantiate_node(SyntaxNode,input, index...(index + 2))
            @index += 2
          else
            terminal_parse_failure('\"')
            r8 = nil
          end
          if r8
            r6 = r8
          else
            if index < input_length
              r9 = instantiate_node(SyntaxNode,input, index...(index + 1))
              @index += 1
            else
              terminal_parse_failure("any character")
              r9 = nil
            end
            if r9
              r6 = r9
            else
              @index = i6
              r6 = nil
            end
          end
        end
        s3 << r6
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(DoubleQuotedString0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
    if r2
      if has_terminal?('"', false, index)
        r10 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure('"')
        r10 = nil
      end
      s0 << r10
    end
  end
  if s0.last
    r0 = instantiate_node(Terminal,input, i0...index, s0)
    r0.extend(DoubleQuotedString1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:double_quoted_string][start_index] = r0

  r0
end

#_nt_grammar ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 398

def _nt_grammar
  start_index = index
  if node_cache[:grammar].has_key?(index)
    cached = node_cache[:grammar][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('grammar', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 7))
    @index += 7
  else
    terminal_parse_failure('grammar')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_space
    s0 << r2
    if r2
      r3 = _nt_grammar_name
      s0 << r3
      if r3
        r4 = _nt_space
        s0 << r4
        if r4
          i6, s6 = index, []
          if has_terminal?('do', false, index)
            r7 = instantiate_node(SyntaxNode,input, index...(index + 2))
            @index += 2
          else
            terminal_parse_failure('do')
            r7 = nil
          end
          s6 << r7
          if r7
            r8 = _nt_space
            s6 << r8
          end
          if s6.last
            r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
            r6.extend(Grammar0)
          else
            @index = i6
            r6 = nil
          end
          if r6
            r5 = r6
          else
            r5 = instantiate_node(SyntaxNode,input, index...index)
          end
          s0 << r5
          if r5
            r9 = _nt_declaration_sequence
            s0 << r9
            if r9
              r11 = _nt_space
              if r11
                r10 = r11
              else
                r10 = instantiate_node(SyntaxNode,input, index...index)
              end
              s0 << r10
              if r10
                if has_terminal?('end', false, index)
                  r12 = instantiate_node(SyntaxNode,input, index...(index + 3))
                  @index += 3
                else
                  terminal_parse_failure('end')
                  r12 = nil
                end
                s0 << r12
              end
            end
          end
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(Grammar,input, i0...index, s0)
    r0.extend(Grammar1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:grammar][start_index] = r0

  r0
end

#_nt_grammar_name ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 494

def _nt_grammar_name
  start_index = index
  if node_cache[:grammar_name].has_key?(index)
    cached = node_cache[:grammar_name][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('\G[A-Z]', true, index)
    r1 = true
    @index += 1
  else
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      r3 = _nt_alphanumeric_char
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(GrammarName0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:grammar_name][start_index] = r0

  r0
end

#_nt_include_declaration ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 681

def _nt_include_declaration
  start_index = index
  if node_cache[:include_declaration].has_key?(index)
    cached = node_cache[:include_declaration][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('include', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 7))
    @index += 7
  else
    terminal_parse_failure('include')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_space
    s0 << r2
    if r2
      if has_terminal?('\G[A-Z]', true, index)
        r3 = true
        @index += 1
      else
        r3 = nil
      end
      s0 << r3
      if r3
        s4, i4 = [], index
        loop do
          i5 = index
          r6 = _nt_alphanumeric_char
          if r6
            r5 = r6
          else
            if has_terminal?('::', false, index)
              r7 = instantiate_node(SyntaxNode,input, index...(index + 2))
              @index += 2
            else
              terminal_parse_failure('::')
              r7 = nil
            end
            if r7
              r5 = r7
            else
              @index = i5
              r5 = nil
            end
          end
          if r5
            s4 << r5
          else
            break
          end
        end
        r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
        s0 << r4
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(IncludeDeclaration0)
    r0.extend(IncludeDeclaration1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:include_declaration][start_index] = r0

  r0
end

#_nt_inline_module ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2989

def _nt_inline_module
  start_index = index
  if node_cache[:inline_module].has_key?(index)
    cached = node_cache[:inline_module][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('{', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('{')
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3 = index
      r4 = _nt_inline_module
      if r4
        r3 = r4
      else
        i5, s5 = index, []
        i6 = index
        if has_terminal?('\G[{}]', true, index)
          r7 = true
          @index += 1
        else
          r7 = nil
        end
        if r7
          r6 = nil
        else
          @index = i6
          r6 = instantiate_node(SyntaxNode,input, index...index)
        end
        s5 << r6
        if r6
          if index < input_length
            r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure("any character")
            r8 = nil
          end
          s5 << r8
        end
        if s5.last
          r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
          r5.extend(InlineModule0)
        else
          @index = i5
          r5 = nil
        end
        if r5
          r3 = r5
        else
          @index = i3
          r3 = nil
        end
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
    if r2
      if has_terminal?('}', false, index)
        r9 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure('}')
        r9 = nil
      end
      s0 << r9
    end
  end
  if s0.last
    r0 = instantiate_node(InlineModule,input, i0...index, s0)
    r0.extend(InlineModule1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:inline_module][start_index] = r0

  r0
end

#_nt_keyword_inside_grammar ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3088

def _nt_keyword_inside_grammar
  start_index = index
  if node_cache[:keyword_inside_grammar].has_key?(index)
    cached = node_cache[:keyword_inside_grammar][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1 = index
  if has_terminal?('rule', false, index)
    r2 = instantiate_node(SyntaxNode,input, index...(index + 4))
    @index += 4
  else
    terminal_parse_failure('rule')
    r2 = nil
  end
  if r2
    r1 = r2
  else
    if has_terminal?('end', false, index)
      r3 = instantiate_node(SyntaxNode,input, index...(index + 3))
      @index += 3
    else
      terminal_parse_failure('end')
      r3 = nil
    end
    if r3
      r1 = r3
    else
      @index = i1
      r1 = nil
    end
  end
  s0 << r1
  if r1
    i4 = index
    r5 = _nt_non_space_char
    if r5
      r4 = nil
    else
      @index = i4
      r4 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r4
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(KeywordInsideGrammar0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:keyword_inside_grammar][start_index] = r0

  r0
end

#_nt_label ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1447

def _nt_label
  start_index = index
  if node_cache[:label].has_key?(index)
    cached = node_cache[:label][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  i2, s2 = index, []
  r3 = _nt_alpha_char
  s2 << r3
  if r3
    s4, i4 = [], index
    loop do
      r5 = _nt_alphanumeric_char
      if r5
        s4 << r5
      else
        break
      end
    end
    r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
    s2 << r4
  end
  if s2.last
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    r2.extend(Label0)
  else
    @index = i2
    r2 = nil
  end
  s1 << r2
  if r2
    if has_terminal?(':', false, index)
      r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure(':')
      r6 = nil
    end
    s1 << r6
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(Label1)
    r1.extend(Label2)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('', false, index)
      r7 = instantiate_node(SyntaxNode,input, index...(index + 0))
      r7.extend(Label3)
      @index += 0
    else
      terminal_parse_failure('')
      r7 = nil
    end
    if r7
      r0 = r7
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:label][start_index] = r0

  r0
end

#_nt_labeled_sequence_primary ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1396

def _nt_labeled_sequence_primary
  start_index = index
  if node_cache[:labeled_sequence_primary].has_key?(index)
    cached = node_cache[:labeled_sequence_primary][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_label
  s0 << r1
  if r1
    r2 = _nt_sequence_primary
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(LabeledSequencePrimary0)
    r0.extend(LabeledSequencePrimary1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:labeled_sequence_primary][start_index] = r0

  r0
end

#_nt_module_declaration ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 264

def _nt_module_declaration
  start_index = index
  if node_cache[:module_declaration].has_key?(index)
    cached = node_cache[:module_declaration][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1, s1 = index, []
  if has_terminal?('module', false, index)
    r2 = instantiate_node(SyntaxNode,input, index...(index + 6))
    @index += 6
  else
    terminal_parse_failure('module')
    r2 = nil
  end
  s1 << r2
  if r2
    r3 = _nt_space
    s1 << r3
    if r3
      if has_terminal?('\G[A-Z]', true, index)
        r4 = true
        @index += 1
      else
        r4 = nil
      end
      s1 << r4
      if r4
        s5, i5 = [], index
        loop do
          r6 = _nt_alphanumeric_char
          if r6
            s5 << r6
          else
            break
          end
        end
        r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
        s1 << r5
        if r5
          r7 = _nt_space
          s1 << r7
        end
      end
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(ModuleDeclaration0)
  else
    @index = i1
    r1 = nil
  end
  s0 << r1
  if r1
    i8 = index
    r9 = _nt_module_declaration
    if r9
      r8 = r9
    else
      r10 = _nt_grammar
      if r10
        r8 = r10
      else
        @index = i8
        r8 = nil
      end
    end
    s0 << r8
    if r8
      i11, s11 = index, []
      r12 = _nt_space
      s11 << r12
      if r12
        if has_terminal?('end', false, index)
          r13 = instantiate_node(SyntaxNode,input, index...(index + 3))
          @index += 3
        else
          terminal_parse_failure('end')
          r13 = nil
        end
        s11 << r13
      end
      if s11.last
        r11 = instantiate_node(SyntaxNode,input, i11...index, s11)
        r11.extend(ModuleDeclaration1)
      else
        @index = i11
        r11 = nil
      end
      s0 << r11
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(ModuleDeclaration2)
    r0.extend(ModuleDeclaration3)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:module_declaration][start_index] = r0

  r0
end

#_nt_nested_parens_in_regex ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2026

def _nt_nested_parens_in_regex
  start_index = index
  if node_cache[:nested_parens_in_regex].has_key?(index)
    cached = node_cache[:nested_parens_in_regex][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('(', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('(')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_regex_body
    s0 << r2
    if r2
      if has_terminal?(')', false, index)
        r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure(')')
        r3 = nil
      end
      s0 << r3
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(NestedParensInRegex0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:nested_parens_in_regex][start_index] = r0

  r0
end

#_nt_node_class_declarations ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1765

def _nt_node_class_declarations
  start_index = index
  if node_cache[:node_class_declarations].has_key?(index)
    cached = node_cache[:node_class_declarations][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_node_class_expression
  s0 << r1
  if r1
    r2 = _nt_trailing_inline_module
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(NodeClassDeclarations0)
    r0.extend(NodeClassDeclarations1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:node_class_declarations][start_index] = r0

  r0
end

#_nt_node_class_expression ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2747

def _nt_node_class_expression
  start_index = index
  if node_cache[:node_class_expression].has_key?(index)
    cached = node_cache[:node_class_expression][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_space
  s1 << r2
  if r2
    if has_terminal?('<', false, index)
      r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure('<')
      r3 = nil
    end
    s1 << r3
    if r3
      s4, i4 = [], index
      loop do
        i5, s5 = index, []
        i6 = index
        if has_terminal?('>', false, index)
          r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure('>')
          r7 = nil
        end
        if r7
          r6 = nil
        else
          @index = i6
          r6 = instantiate_node(SyntaxNode,input, index...index)
        end
        s5 << r6
        if r6
          if index < input_length
            r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure("any character")
            r8 = nil
          end
          s5 << r8
        end
        if s5.last
          r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
          r5.extend(NodeClassExpression0)
        else
          @index = i5
          r5 = nil
        end
        if r5
          s4 << r5
        else
          break
        end
      end
      if s4.empty?
        @index = i4
        r4 = nil
      else
        r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      end
      s1 << r4
      if r4
        if has_terminal?('>', false, index)
          r9 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure('>')
          r9 = nil
        end
        s1 << r9
      end
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(NodeClassExpression1)
    r1.extend(NodeClassExpression2)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('', false, index)
      r10 = instantiate_node(SyntaxNode,input, index...(index + 0))
      r10.extend(NodeClassExpression3)
      @index += 0
    else
      terminal_parse_failure('')
      r10 = nil
    end
    if r10
      r0 = r10
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:node_class_expression][start_index] = r0

  r0
end

#_nt_non_space_char ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3150

def _nt_non_space_char
  start_index = index
  if node_cache[:non_space_char].has_key?(index)
    cached = node_cache[:non_space_char][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1 = index
  r2 = _nt_space
  if r2
    r1 = nil
  else
    @index = i1
    r1 = instantiate_node(SyntaxNode,input, index...index)
  end
  s0 << r1
  if r1
    if index < input_length
      r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("any character")
      r3 = nil
    end
    s0 << r3
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(NonSpaceChar0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:non_space_char][start_index] = r0

  r0
end

#_nt_nonterminal ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2156

def _nt_nonterminal
  start_index = index
  if node_cache[:nonterminal].has_key?(index)
    cached = node_cache[:nonterminal][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1 = index
  r2 = _nt_keyword_inside_grammar
  if r2
    r1 = nil
  else
    @index = i1
    r1 = instantiate_node(SyntaxNode,input, index...index)
  end
  s0 << r1
  if r1
    i3, s3 = index, []
    r4 = _nt_alpha_char
    s3 << r4
    if r4
      s5, i5 = [], index
      loop do
        r6 = _nt_alphanumeric_char
        if r6
          s5 << r6
        else
          break
        end
      end
      r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
      s3 << r5
    end
    if s3.last
      r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
      r3.extend(Nonterminal0)
    else
      @index = i3
      r3 = nil
    end
    s0 << r3
  end
  if s0.last
    r0 = instantiate_node(Nonterminal,input, i0...index, s0)
    r0.extend(Nonterminal1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:nonterminal][start_index] = r0

  r0
end

#_nt_optional_suffix ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1716

def _nt_optional_suffix
  start_index = index
  if node_cache[:optional_suffix].has_key?(index)
    cached = node_cache[:optional_suffix][index]
    @index = cached.interval.end if cached
    return cached
  end

  if has_terminal?('?', false, index)
    r0 = instantiate_node(Optional,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('?')
    r0 = nil
  end

  node_cache[:optional_suffix][start_index] = r0

  r0
end

#_nt_parenthesized_expression ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2083

def _nt_parenthesized_expression
  start_index = index
  if node_cache[:parenthesized_expression].has_key?(index)
    cached = node_cache[:parenthesized_expression][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('(', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('(')
    r1 = nil
  end
  s0 << r1
  if r1
    r3 = _nt_space
    if r3
      r2 = r3
    else
      r2 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r2
    if r2
      r4 = _nt_parsing_expression
      s0 << r4
      if r4
        r6 = _nt_space
        if r6
          r5 = r6
        else
          r5 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r5
        if r5
          if has_terminal?(')', false, index)
            r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure(')')
            r7 = nil
          end
          s0 << r7
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(ParenthesizedExpression,input, i0...index, s0)
    r0.extend(ParenthesizedExpression0)
    r0.extend(ParenthesizedExpression1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:parenthesized_expression][start_index] = r0

  r0
end

#_nt_parsing_expression ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 873

def _nt_parsing_expression
  start_index = index
  if node_cache[:parsing_expression].has_key?(index)
    cached = node_cache[:parsing_expression][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_choice
  if r1
    r0 = r1
  else
    r2 = _nt_sequence
    if r2
      r0 = r2
    else
      r3 = _nt_primary
      if r3
        r0 = r3
      else
        @index = i0
        r0 = nil
      end
    end
  end

  node_cache[:parsing_expression][start_index] = r0

  r0
end

#_nt_parsing_rule ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 785

def _nt_parsing_rule
  start_index = index
  if node_cache[:parsing_rule].has_key?(index)
    cached = node_cache[:parsing_rule][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('rule', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 4))
    @index += 4
  else
    terminal_parse_failure('rule')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_space
    s0 << r2
    if r2
      r3 = _nt_nonterminal
      s0 << r3
      if r3
        r4 = _nt_space
        s0 << r4
        if r4
          i6, s6 = index, []
          if has_terminal?('do', false, index)
            r7 = instantiate_node(SyntaxNode,input, index...(index + 2))
            @index += 2
          else
            terminal_parse_failure('do')
            r7 = nil
          end
          s6 << r7
          if r7
            r8 = _nt_space
            s6 << r8
          end
          if s6.last
            r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
            r6.extend(ParsingRule0)
          else
            @index = i6
            r6 = nil
          end
          if r6
            r5 = r6
          else
            r5 = instantiate_node(SyntaxNode,input, index...index)
          end
          s0 << r5
          if r5
            r9 = _nt_parsing_expression
            s0 << r9
            if r9
              r10 = _nt_space
              s0 << r10
              if r10
                if has_terminal?('end', false, index)
                  r11 = instantiate_node(SyntaxNode,input, index...(index + 3))
                  @index += 3
                else
                  terminal_parse_failure('end')
                  r11 = nil
                end
                s0 << r11
              end
            end
          end
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(ParsingRule,input, i0...index, s0)
    r0.extend(ParsingRule1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:parsing_rule][start_index] = r0

  r0
end

#_nt_predicate_block ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2949

def _nt_predicate_block
  start_index = index
  if node_cache[:predicate_block].has_key?(index)
    cached = node_cache[:predicate_block][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 0))
    @index += 0
  else
    terminal_parse_failure('')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_inline_module
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(PredicateBlock,input, i0...index, s0)
    r0.extend(PredicateBlock0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:predicate_block][start_index] = r0

  r0
end

#_nt_prefix ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1833

def _nt_prefix
  start_index = index
  if node_cache[:prefix].has_key?(index)
    cached = node_cache[:prefix][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  if has_terminal?('&', false, index)
    r1 = instantiate_node(AndPredicate,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('&')
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('!', false, index)
      r2 = instantiate_node(NotPredicate,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure('!')
      r2 = nil
    end
    if r2
      r0 = r2
    else
      if has_terminal?('~', false, index)
        r3 = instantiate_node(TransientPrefix,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure('~')
        r3 = nil
      end
      if r3
        r0 = r3
      else
        @index = i0
        r0 = nil
      end
    end
  end

  node_cache[:prefix][start_index] = r0

  r0
end

#_nt_primary ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1260

def _nt_primary
  start_index = index
  if node_cache[:primary].has_key?(index)
    cached = node_cache[:primary][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_prefix
  s1 << r2
  if r2
    r3 = _nt_atomic
    s1 << r3
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(Primary0)
    r1.extend(Primary1)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    i4, s4 = index, []
    r5 = _nt_prefix
    s4 << r5
    if r5
      r7 = _nt_space
      if r7
        r6 = r7
      else
        r6 = instantiate_node(SyntaxNode,input, index...index)
      end
      s4 << r6
      if r6
        r8 = _nt_predicate_block
        s4 << r8
      end
    end
    if s4.last
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      r4.extend(Primary2)
      r4.extend(Primary3)
    else
      @index = i4
      r4 = nil
    end
    if r4
      r0 = r4
    else
      i9, s9 = index, []
      r10 = _nt_atomic
      s9 << r10
      if r10
        r11 = _nt_suffix
        s9 << r11
        if r11
          r12 = _nt_node_class_declarations
          s9 << r12
        end
      end
      if s9.last
        r9 = instantiate_node(SyntaxNode,input, i9...index, s9)
        r9.extend(Primary4)
        r9.extend(Primary5)
      else
        @index = i9
        r9 = nil
      end
      if r9
        r0 = r9
      else
        i13, s13 = index, []
        r14 = _nt_atomic
        s13 << r14
        if r14
          r15 = _nt_node_class_declarations
          s13 << r15
        end
        if s13.last
          r13 = instantiate_node(SyntaxNode,input, i13...index, s13)
          r13.extend(Primary6)
          r13.extend(Primary7)
        else
          @index = i13
          r13 = nil
        end
        if r13
          r0 = r13
        else
          @index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:primary][start_index] = r0

  r0
end

#_nt_quoted_string ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2251

def _nt_quoted_string
  start_index = index
  if node_cache[:quoted_string].has_key?(index)
    cached = node_cache[:quoted_string][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_single_quoted_string
  if r1
    r0 = r1
    r0.extend(QuotedString0)
  else
    r2 = _nt_double_quoted_string
    if r2
      r0 = r2
      r0.extend(QuotedString0)
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:quoted_string][start_index] = r0

  r0
end

#_nt_regex ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1933

def _nt_regex
  start_index = index
  if node_cache[:regex].has_key?(index)
    cached = node_cache[:regex][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?('r(', false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 2))
    @index += 2
  else
    terminal_parse_failure('r(')
    r1 = nil
  end
  s0 << r1
  if r1
    r2 = _nt_regex_body
    s0 << r2
    if r2
      if has_terminal?(')', false, index)
        r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure(')')
        r3 = nil
      end
      s0 << r3
    end
  end
  if s0.last
    r0 = instantiate_node(Regex,input, i0...index, s0)
    r0.extend(Regex0)
    r0.extend(Regex1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:regex][start_index] = r0

  r0
end

#_nt_regex_body ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1978

def _nt_regex_body
  start_index = index
  if node_cache[:regex_body].has_key?(index)
    cached = node_cache[:regex_body][index]
    @index = cached.interval.end if cached
    return cached
  end

  s0, i0 = [], index
  loop do
    i1 = index
    r2 = _nt_nested_parens_in_regex
    if r2
      r1 = r2
    else
      if has_terminal?('\G[^)]', true, index)
        r3 = true
        @index += 1
      else
        r3 = nil
      end
      if r3
        r1 = r3
      else
        @index = i1
        r1 = nil
      end
    end
    if r1
      s0 << r1
    else
      break
    end
  end
  r0 = instantiate_node(SyntaxNode,input, i0...index, s0)

  node_cache[:regex_body][start_index] = r0

  r0
end

#_nt_repetition_suffix ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1794

def _nt_repetition_suffix
  start_index = index
  if node_cache[:repetition_suffix].has_key?(index)
    cached = node_cache[:repetition_suffix][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  if has_terminal?('+', false, index)
    r1 = instantiate_node(OneOrMore,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('+')
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('*', false, index)
      r2 = instantiate_node(ZeroOrMore,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure('*')
      r2 = nil
    end
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:repetition_suffix][start_index] = r0

  r0
end

#_nt_require_statement ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 133

def _nt_require_statement
  start_index = index
  if node_cache[:require_statement].has_key?(index)
    cached = node_cache[:require_statement][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r2 = _nt_space
  if r2
    r1 = r2
  else
    r1 = instantiate_node(SyntaxNode,input, index...index)
  end
  s0 << r1
  if r1
    if has_terminal?("require", false, index)
      r3 = instantiate_node(SyntaxNode,input, index...(index + 7))
      @index += 7
    else
      terminal_parse_failure("require")
      r3 = nil
    end
    s0 << r3
    if r3
      s4, i4 = [], index
      loop do
        if has_terminal?('\G[ \\t]', true, index)
          r5 = true
          @index += 1
        else
          r5 = nil
        end
        if r5
          s4 << r5
        else
          break
        end
      end
      if s4.empty?
        @index = i4
        r4 = nil
      else
        r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      end
      s0 << r4
      if r4
        s6, i6 = [], index
        loop do
          if has_terminal?('\G[^\\n\\r]', true, index)
            r7 = true
            @index += 1
          else
            r7 = nil
          end
          if r7
            s6 << r7
          else
            break
          end
        end
        if s6.empty?
          @index = i6
          r6 = nil
        else
          r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
        end
        s0 << r6
        if r6
          if has_terminal?('\G[\\n\\r]', true, index)
            r8 = true
            @index += 1
          else
            r8 = nil
          end
          s0 << r8
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(RequireStatement0)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:require_statement][start_index] = r0

  r0
end

#_nt_sequence ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1059

def _nt_sequence
  start_index = index
  if node_cache[:sequence].has_key?(index)
    cached = node_cache[:sequence][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_labeled_sequence_primary
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      r4 = _nt_space
      s3 << r4
      if r4
        r5 = _nt_labeled_sequence_primary
        s3 << r5
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(Sequence0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    if s2.empty?
      @index = i2
      r2 = nil
    else
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    end
    s0 << r2
    if r2
      r6 = _nt_node_class_declarations
      s0 << r6
    end
  end
  if s0.last
    r0 = instantiate_node(Sequence,input, i0...index, s0)
    r0.extend(Sequence1)
    r0.extend(Sequence2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:sequence][start_index] = r0

  r0
end

#_nt_sequence_primary ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1601

def _nt_sequence_primary
  start_index = index
  if node_cache[:sequence_primary].has_key?(index)
    cached = node_cache[:sequence_primary][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_prefix
  s1 << r2
  if r2
    r3 = _nt_atomic
    s1 << r3
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(SequencePrimary0)
    r1.extend(SequencePrimary1)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    i4, s4 = index, []
    r5 = _nt_prefix
    s4 << r5
    if r5
      r7 = _nt_space
      if r7
        r6 = r7
      else
        r6 = instantiate_node(SyntaxNode,input, index...index)
      end
      s4 << r6
      if r6
        r8 = _nt_predicate_block
        s4 << r8
      end
    end
    if s4.last
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      r4.extend(SequencePrimary2)
      r4.extend(SequencePrimary3)
    else
      @index = i4
      r4 = nil
    end
    if r4
      r0 = r4
    else
      i9, s9 = index, []
      r10 = _nt_atomic
      s9 << r10
      if r10
        r11 = _nt_suffix
        s9 << r11
      end
      if s9.last
        r9 = instantiate_node(SyntaxNode,input, i9...index, s9)
        r9.extend(SequencePrimary4)
        r9.extend(SequencePrimary5)
      else
        @index = i9
        r9 = nil
      end
      if r9
        r0 = r9
      else
        r12 = _nt_atomic
        if r12
          r0 = r12
        else
          @index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:sequence_primary][start_index] = r0

  r0
end

#_nt_single_quoted_string ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2414

def _nt_single_quoted_string
  start_index = index
  if node_cache[:single_quoted_string].has_key?(index)
    cached = node_cache[:single_quoted_string][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if has_terminal?("'", false, index)
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure("'")
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      i4 = index
      if has_terminal?("'", false, index)
        r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("'")
        r5 = nil
      end
      if r5
        r4 = nil
      else
        @index = i4
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        i6 = index
        if has_terminal?("\\\\", false, index)
          r7 = instantiate_node(SyntaxNode,input, index...(index + 2))
          @index += 2
        else
          terminal_parse_failure("\\\\")
          r7 = nil
        end
        if r7
          r6 = r7
        else
          if has_terminal?("\\'", false, index)
            r8 = instantiate_node(SyntaxNode,input, index...(index + 2))
            @index += 2
          else
            terminal_parse_failure("\\'")
            r8 = nil
          end
          if r8
            r6 = r8
          else
            if index < input_length
              r9 = instantiate_node(SyntaxNode,input, index...(index + 1))
              @index += 1
            else
              terminal_parse_failure("any character")
              r9 = nil
            end
            if r9
              r6 = r9
            else
              @index = i6
              r6 = nil
            end
          end
        end
        s3 << r6
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(SingleQuotedString0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
    if r2
      if has_terminal?("'", false, index)
        r10 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("'")
        r10 = nil
      end
      s0 << r10
    end
  end
  if s0.last
    r0 = instantiate_node(Terminal,input, i0...index, s0)
    r0.extend(SingleQuotedString1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:single_quoted_string][start_index] = r0

  r0
end

#_nt_space ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3243

def _nt_space
  start_index = index
  if node_cache[:space].has_key?(index)
    cached = node_cache[:space][index]
    @index = cached.interval.end if cached
    return cached
  end

  s0, i0 = [], index
  loop do
    i1 = index
    r2 = _nt_white
    if r2
      r1 = r2
    else
      r3 = _nt_comment_to_eol
      if r3
        r1 = r3
      else
        @index = i1
        r1 = nil
      end
    end
    if r1
      s0 << r1
    else
      break
    end
  end
  if s0.empty?
    @index = i0
    r0 = nil
  else
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
  end

  node_cache[:space][start_index] = r0

  r0
end

#_nt_suffix ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 1689

def _nt_suffix
  start_index = index
  if node_cache[:suffix].has_key?(index)
    cached = node_cache[:suffix][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_repetition_suffix
  if r1
    r0 = r1
  else
    r2 = _nt_optional_suffix
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:suffix][start_index] = r0

  r0
end

#_nt_terminal ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2213

def _nt_terminal
  start_index = index
  if node_cache[:terminal].has_key?(index)
    cached = node_cache[:terminal][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_quoted_string
  if r1
    r0 = r1
  else
    r2 = _nt_character_class
    if r2
      r0 = r2
    else
      r3 = _nt_anything_symbol
      if r3
        r0 = r3
      else
        @index = i0
        r0 = nil
      end
    end
  end

  node_cache[:terminal][start_index] = r0

  r0
end

#_nt_trailing_inline_module ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 2895

def _nt_trailing_inline_module
  start_index = index
  if node_cache[:trailing_inline_module].has_key?(index)
    cached = node_cache[:trailing_inline_module][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_space
  s1 << r2
  if r2
    r3 = _nt_inline_module
    s1 << r3
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(TrailingInlineModule0)
    r1.extend(TrailingInlineModule1)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if has_terminal?('', false, index)
      r4 = instantiate_node(SyntaxNode,input, index...(index + 0))
      r4.extend(TrailingInlineModule2)
      @index += 0
    else
      terminal_parse_failure('')
      r4 = nil
    end
    if r4
      r0 = r4
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:trailing_inline_module][start_index] = r0

  r0
end

#_nt_treetop_file ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 40

def _nt_treetop_file
  start_index = index
  if node_cache[:treetop_file].has_key?(index)
    cached = node_cache[:treetop_file][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  s1, i1 = [], index
  loop do
    i2, s2 = index, []
    r4 = _nt_space
    if r4
      r3 = r4
    else
      r3 = instantiate_node(SyntaxNode,input, index...index)
    end
    s2 << r3
    if r3
      r5 = _nt_require_statement
      s2 << r5
    end
    if s2.last
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
      r2.extend(TreetopFile0)
    else
      @index = i2
      r2 = nil
    end
    if r2
      s1 << r2
    else
      break
    end
  end
  r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
  s0 << r1
  if r1
    r7 = _nt_space
    if r7
      r6 = r7
    else
      r6 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r6
    if r6
      i8 = index
      r9 = _nt_module_declaration
      if r9
        r8 = r9
      else
        r10 = _nt_grammar
        if r10
          r8 = r10
        else
          @index = i8
          r8 = nil
        end
      end
      s0 << r8
      if r8
        r12 = _nt_space
        if r12
          r11 = r12
        else
          r11 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r11
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(TreetopFile1)
    r0.extend(TreetopFile2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:treetop_file][start_index] = r0

  r0
end

#_nt_white ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 3365

def _nt_white
  start_index = index
  if node_cache[:white].has_key?(index)
    cached = node_cache[:white][index]
    @index = cached.interval.end if cached
    return cached
  end

  if has_terminal?('\G[ \\t\\n\\r]', true, index)
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    r0 = nil
  end

  node_cache[:white][start_index] = r0

  r0
end

#root ⇒ Object 



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# File 'lib/treetop/compiler/metagrammar.rb', line 6

def root
  @root || :treetop_file
end