logstash-core/lib/logstash/config/grammar.rb [562:619]:
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  def _nt_plugins
    start_index = index
    if node_cache[:plugins].has_key?(index)
      cached = node_cache[:plugins][index]
      if cached
        node_cache[:plugins][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i1, s1 = index, []
    r2 = _nt_plugin
    s1 << r2
    if r2
      s3, i3 = [], index
      loop do
        i4, s4 = index, []
        r5 = _nt_cs
        s4 << r5
        if r5
          r6 = _nt_plugin
          s4 << r6
        end
        if s4.last
          r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
          r4.extend(Plugins0)
        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(SyntaxNode,input, i1...index, s1)
      r1.extend(Plugins1)
    else
      @index = i1
      r1 = nil
    end
    if r1
      r0 = r1
    else
      r0 = instantiate_node(SyntaxNode,input, index...index)
    end

    node_cache[:plugins][start_index] = r0

    r0
  end
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [538:595]:
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  def _nt_plugins
    start_index = index
    if node_cache[:plugins].has_key?(index)
      cached = node_cache[:plugins][index]
      if cached
        node_cache[:plugins][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i1, s1 = index, []
    r2 = _nt_plugin
    s1 << r2
    if r2
      s3, i3 = [], index
      loop do
        i4, s4 = index, []
        r5 = _nt_cs
        s4 << r5
        if r5
          r6 = _nt_plugin
          s4 << r6
        end
        if s4.last
          r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
          r4.extend(Plugins0)
        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(SyntaxNode,input, i1...index, s1)
      r1.extend(Plugins1)
    else
      @index = i1
      r1 = nil
    end
    if r1
      r0 = r1
    else
      r0 = instantiate_node(SyntaxNode,input, index...index)
    end

    node_cache[:plugins][start_index] = r0

    r0
  end
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