# File lib/treetop/compiler/metagrammar.rb, line 43
      def _nt_treetop_file
        start_index = index
        if node_cache[:treetop_file].has_key?(index)
          cached = node_cache[:treetop_file][index]
          if cached
            cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
            @index = cached.interval.end
          end
          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