logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [2447:2525]:
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      r0.extend(Condition1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:condition][start_index] = r0

    r0
  end

  module Expression0
    def cs1
      elements[1]
    end

    def condition
      elements[2]
    end

    def cs2
      elements[3]
    end

  end

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

    i0 = index
    i1, s1 = index, []
    if (match_len = has_terminal?("(", false, index))
      r2 = true
      @index += match_len
    else
      terminal_parse_failure('"("')
      r2 = nil
    end
    s1 << r2
    if r2
      r3 = _nt_cs
      s1 << r3
      if r3
        r4 = _nt_condition
        s1 << r4
        if r4
          r5 = _nt_cs
          s1 << r5
          if r5
            if (match_len = has_terminal?(")", false, index))
              r6 = true
              @index += match_len
            else
              terminal_parse_failure('")"')
              r6 = nil
            end
            s1 << r6
          end
        end
      end
    end
    if s1.last
      r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
      r1.extend(Expression0)
    else
      @index = i1
      r1 = nil
    end
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
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logstash-core/lib/logstash/config/grammar.rb [2471:2549]:
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      r0.extend(Condition1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:condition][start_index] = r0

    r0
  end

  module Expression0
    def cs1
      elements[1]
    end

    def condition
      elements[2]
    end

    def cs2
      elements[3]
    end

  end

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

    i0 = index
    i1, s1 = index, []
    if (match_len = has_terminal?("(", false, index))
      r2 = true
      @index += match_len
    else
      terminal_parse_failure('"("')
      r2 = nil
    end
    s1 << r2
    if r2
      r3 = _nt_cs
      s1 << r3
      if r3
        r4 = _nt_condition
        s1 << r4
        if r4
          r5 = _nt_cs
          s1 << r5
          if r5
            if (match_len = has_terminal?(")", false, index))
              r6 = true
              @index += match_len
            else
              terminal_parse_failure('")"')
              r6 = nil
            end
            s1 << r6
          end
        end
      end
    end
    if s1.last
      r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
      r1.extend(Expression0)
    else
      @index = i1
      r1 = nil
    end
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
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