_nt_selector_element

in logstash-core/lib/logstash/config/grammar.rb [3570:3636]

• 63 lines of code
• 13 McCabe index (conditional complexity)

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

    i0, s0 = index, []
    if (match_len = has_terminal?("[", false, index))
      r1 = true
      @index += match_len
    else
      terminal_parse_failure('"["')
      r1 = nil
    end
    s0 << r1
    if r1
      s2, i2 = [], index
      loop do
        if has_terminal?(@regexps[gr = '\A[^\\]\\[,]'] ||= Regexp.new(gr), :regexp, index)
          r3 = true
          @index += 1
        else
          terminal_parse_failure('[^\\]\\[,]')
          r3 = nil
        end
        if r3
          s2 << r3
        else
          break
        end
      end
      if s2.empty?
        @index = i2
        r2 = nil
      else
        r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
      end
      s0 << r2
      if r2
        if (match_len = has_terminal?("]", false, index))
          r4 = true
          @index += match_len
        else
          terminal_parse_failure('"]"')
          r4 = nil
        end
        s0 << r4
      end
    end
    if s0.last
      r0 = instantiate_node(LogStash::Config::AST::SelectorElement,input, i0...index, s0)
      r0.extend(SelectorElement0)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:selector_element][start_index] = r0

    r0
  end