# Autogenerated from a Treetop grammar. Edits may be lost.


module Mail
  module RFC2822
    include Treetop::Runtime

    def root
      @root ||= :ALPHA
    end

    include RFC2822Obsolete

    def _nt_ALPHA
      start_index = index
      if node_cache[:ALPHA].has_key?(index)
        cached = node_cache[:ALPHA][index]
        if cached
          cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
          @index = cached.interval.end
        end
        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][start_index] = r0

      r0
    end

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

      if has_terminal?('\G[0-9]', true, index)
        r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        r0 = nil
      end

      node_cache[:DIGIT][start_index] = r0

      r0
    end

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

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

      node_cache[:DQUOTE][start_index] = r0

      r0
    end

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

      if has_terminal?("\n", false, index)
        r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("\n")
        r0 = nil
      end

      node_cache[:LF][start_index] = r0

      r0
    end

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

      if has_terminal?("\r", false, index)
        r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("\r")
        r0 = nil
      end

      node_cache[:CR][start_index] = r0

      r0
    end

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

      if has_terminal?("\r\n", false, index)
        r0 = instantiate_node(SyntaxNode,input, index...(index + 2))
        @index += 2
      else
        terminal_parse_failure("\r\n")
        r0 = nil
      end

      node_cache[:CRLF][start_index] = r0

      r0
    end

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

      if has_terminal?('\G[\\x09\\x20]', true, index)
        r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        r0 = nil
      end

      node_cache[:WSP][start_index] = r0

      r0
    end

    module FWS0
      def CRLF
        elements[1]
      end

    end

    module FWS1
      def CRLF
        elements[0]
      end

    end

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

      i0 = index
      i1, s1 = index, []
      s2, i2 = [], index
      loop do
        r3 = _nt_WSP
        if r3
          s2 << r3
        else
          break
        end
      end
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
      s1 << r2
      if r2
        r4 = _nt_CRLF
        s1 << r4
        if r4
          s5, i5 = [], index
          loop do
            r6 = _nt_WSP
            if r6
              s5 << r6
            else
              break
            end
          end
          if s5.empty?
            @index = i5
            r5 = nil
          else
            r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
          end
          s1 << r5
        end
      end
      if s1.last
        r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
        r1.extend(FWS0)
      else
        @index = i1
        r1 = nil
      end
      if r1
        r0 = r1
      else
        i7, s7 = index, []
        r8 = _nt_CRLF
        s7 << r8
        if r8
          s9, i9 = [], index
          loop do
            r10 = _nt_WSP
            if r10
              s9 << r10
            else
              break
            end
          end
          if s9.empty?
            @index = i9
            r9 = nil
          else
            r9 = instantiate_node(SyntaxNode,input, i9...index, s9)
          end
          s7 << r9
        end
        if s7.last
          r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
          r7.extend(FWS1)
        else
          @index = i7
          r7 = nil
        end
        if r7
          r0 = r7
        else
          r11 = _nt_obs_FWS
          if r11
            r0 = r11
          else
            @index = i0
            r0 = nil
          end
        end
      end

      node_cache[:FWS][start_index] = r0

      r0
    end

    module CFWS0
      def comment
        elements[1]
      end
    end

    module CFWS1
    end

    def _nt_CFWS
      start_index = index
      if node_cache[:CFWS].has_key?(index)
        cached = node_cache[:CFWS][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, []
        s3, i3 = [], index
        loop do
          r4 = _nt_FWS
          if r4
            s3 << r4
          else
            break
          end
        end
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        s2 << r3
        if r3
          r5 = _nt_comment
          s2 << r5
        end
        if s2.last
          r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          r2.extend(CFWS0)
        else
          @index = i2
          r2 = nil
        end
        if r2
          s1 << r2
        else
          break
        end