logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [2361:2445]:
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      r0.extend(Else1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:else][start_index] = r0

    r0
  end

  module Condition0
    def cs1
      elements[0]
    end

    def boolean_operator
      elements[1]
    end

    def cs2
      elements[2]
    end

    def expression
      elements[3]
    end
  end

  module Condition1
    def expression
      elements[0]
    end

  end

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

    i0, s0 = index, []
    r1 = _nt_expression
    s0 << r1
    if r1
      s2, i2 = [], index
      loop do
        i3, s3 = index, []
        r4 = _nt_cs
        s3 << r4
        if r4
          r5 = _nt_boolean_operator
          s3 << r5
          if r5
            r6 = _nt_cs
            s3 << r6
            if r6
              r7 = _nt_expression
              s3 << r7
            end
          end
        end
        if s3.last
          r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
          r3.extend(Condition0)
        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
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logstash-core/lib/logstash/config/grammar.rb [2385:2469]:
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      r0.extend(Else1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:else][start_index] = r0

    r0
  end

  module Condition0
    def cs1
      elements[0]
    end

    def boolean_operator
      elements[1]
    end

    def cs2
      elements[2]
    end

    def expression
      elements[3]
    end
  end

  module Condition1
    def expression
      elements[0]
    end

  end

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

    i0, s0 = index, []
    r1 = _nt_expression
    s0 << r1
    if r1
      s2, i2 = [], index
      loop do
        i3, s3 = index, []
        r4 = _nt_cs
        s3 << r4
        if r4
          r5 = _nt_boolean_operator
          s3 << r5
          if r5
            r6 = _nt_cs
            s3 << r6
            if r6
              r7 = _nt_expression
              s3 << r7
            end
          end
        end
        if s3.last
          r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
          r3.extend(Condition0)
        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
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