_nt_regexp

in logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [1304:1414]

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

  def _nt_regexp
    start_index = index
    if node_cache[:regexp].has_key?(index)
      cached = node_cache[:regexp][index]
      if cached
        node_cache[:regexp][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
        i3 = index
        if (match_len = has_terminal?('\/', false, index))
          r4 = instantiate_node(SyntaxNode,input, index...(index + match_len))
          @index += match_len
        else
          terminal_parse_failure('\'\\/\'')
          r4 = nil
        end
        if r4
          r4 = SyntaxNode.new(input, (index-1)...index) if r4 == true
          r3 = r4
        else
          i5, s5 = index, []
          i6 = index
          if (match_len = has_terminal?('/', false, index))
            r7 = true
            @index += match_len
          else
            terminal_parse_failure('\'/\'')
            r7 = nil
          end
          if r7
            @index = i6
            r6 = nil
            terminal_parse_failure('\'/\'', true)
          else
            @terminal_failures.pop
            @index = i6
            r6 = instantiate_node(SyntaxNode,input, index...index)
          end
          s5 << r6
          if r6
            if index < input_length
              r8 = true
              @index += 1
            else
              terminal_parse_failure("any character")
              r8 = nil
            end
            s5 << r8
          end
          if s5.last
            r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
            r5.extend(Regexp0)
          else
            @index = i5
            r5 = nil
          end
          if r5
            r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
            r3 = r5
          else
            @index = i3
            r3 = nil
          end
        end
        if r3
          s2 << r3
        else
          break
        end
      end
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
      s0 << r2
      if r2
        if (match_len = has_terminal?('/', false, index))
          r9 = true
          @index += match_len
        else
          terminal_parse_failure('\'/\'')
          r9 = nil
        end
        s0 << r9
      end
    end
    if s0.last
      r0 = instantiate_node(LogStash::Compiler::LSCL::AST::RegExp,input, i0...index, s0)
      r0.extend(Regexp1)
    else
      @index = i0
      r0 = nil
    end

    node_cache[:regexp][start_index] = r0

    r0
  end