_nt_number

in logstash-core/lib/logstash/config/grammar.rb [1445:1549]

• 101 lines of code
• 20 McCabe index (conditional complexity)

  def _nt_number
    start_index = index
    if node_cache[:number].has_key?(index)
      cached = node_cache[:number][index]
      if cached
        node_cache[:number][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))
      r2 = true
      @index += match_len
    else
      terminal_parse_failure('"-"')
      r2 = nil
    end
    if r2
      r1 = r2
    else
      r1 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r1
    if r1
      s3, i3 = [], index
      loop do
        if has_terminal?(@regexps[gr = '\A[0-9]'] ||= Regexp.new(gr), :regexp, index)
          r4 = true
          @index += 1
        else
          terminal_parse_failure('[0-9]')
          r4 = nil
        end
        if r4
          s3 << r4
        else
          break
        end
      end
      if s3.empty?
        @index = i3
        r3 = nil
      else
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
      end
      s0 << r3
      if r3
        i6, s6 = index, []
        if (match_len = has_terminal?(".", false, index))
          r7 = true
          @index += match_len
        else
          terminal_parse_failure('"."')
          r7 = nil
        end
        s6 << r7
        if r7
          s8, i8 = [], index
          loop do
            if has_terminal?(@regexps[gr = '\A[0-9]'] ||= Regexp.new(gr), :regexp, index)
              r9 = true
              @index += 1
            else
              terminal_parse_failure('[0-9]')
              r9 = nil
            end
            if r9
              s8 << r9
            else
              break
            end
          end
          r8 = instantiate_node(SyntaxNode,input, i8...index, s8)
          s6 << r8
        end
        if s6.last
          r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
          r6.extend(Number0)
        else
          @index = i6
          r6 = nil
        end
        if r6
          r5 = r6
        else
          r5 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r5
      end
    end
    if s0.last
      r0 = instantiate_node(LogStash::Config::AST::Number,input, i0...index, s0)
      r0.extend(Number1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:number][start_index] = r0

    r0
  end