logstash-core/lib/logstash/config/grammar.rb [489:544]:
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  def _nt_plugin_type
    start_index = index
    if node_cache[:plugin_type].has_key?(index)
      cached = node_cache[:plugin_type][index]
      if cached
        node_cache[:plugin_type][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0 = index
    if (match_len = has_terminal?("input", false, index))
      r1 = instantiate_node(SyntaxNode,input, index...(index + match_len))
      @index += match_len
    else
      terminal_parse_failure('"input"')
      r1 = nil
    end
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
    else
      if (match_len = has_terminal?("filter", false, index))
        r2 = instantiate_node(SyntaxNode,input, index...(index + match_len))
        @index += match_len
      else
        terminal_parse_failure('"filter"')
        r2 = nil
      end
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r0 = r2
      else
        if (match_len = has_terminal?("output", false, index))
          r3 = instantiate_node(SyntaxNode,input, index...(index + match_len))
          @index += match_len
        else
          terminal_parse_failure('"output"')
          r3 = nil
        end
        if r3
          r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
          r0 = r3
        else
          @index = i0
          r0 = nil
        end
      end
    end

    node_cache[:plugin_type][start_index] = r0

    r0
  end
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [465:520]:
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  def _nt_plugin_type
    start_index = index
    if node_cache[:plugin_type].has_key?(index)
      cached = node_cache[:plugin_type][index]
      if cached
        node_cache[:plugin_type][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0 = index
    if (match_len = has_terminal?("input", false, index))
      r1 = instantiate_node(SyntaxNode,input, index...(index + match_len))
      @index += match_len
    else
      terminal_parse_failure('"input"')
      r1 = nil
    end
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
    else
      if (match_len = has_terminal?("filter", false, index))
        r2 = instantiate_node(SyntaxNode,input, index...(index + match_len))
        @index += match_len
      else
        terminal_parse_failure('"filter"')
        r2 = nil
      end
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r0 = r2
      else
        if (match_len = has_terminal?("output", false, index))
          r3 = instantiate_node(SyntaxNode,input, index...(index + match_len))
          @index += match_len
        else
          terminal_parse_failure('"output"')
          r3 = nil
        end
        if r3
          r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
          r0 = r3
        else
          @index = i0
          r0 = nil
        end
      end
    end

    node_cache[:plugin_type][start_index] = r0

    r0
  end
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