rouge-ruby/rouge · error · InvalidRule

#rule used both arguments and a block. Only one is supported

Error message

#rule used both arguments and a block. Only one is supported.

What it means

Error "#rule used both arguments and a block. Only one is supported." thrown in rouge-ruby/rouge.

Source

Thrown at lib/rouge/regex_lexer.rb:177

          @group = 0
          @sets = []
          instance_eval(&defn)
        end

        def transform(&b)
          @mapper = b
        end

        def group(g)
          @group = g
        end

        def rule(keyword_set, *args, &action)
          unless keyword_set.is_a?(Set) || keyword_set.is_a?(Symbol)
            raise InvalidKeywordSet.new(@lexer_class)
          end

          raise InvalidRule if action && args.any?
          action ||= Rule.make_action(@covering_regex, *args)

          @sets << [keyword_set, action]
        end

        def default(*args, &block)
          @default = block || Rule.make_action(@covering_regex, *args)
        end

        def to_proc
          mapper = @mapper
          sets = @sets
          default = @default
          group = @group

          proc do |m|
            match = m[group]
            match = mapper.call(match) if mapper

View on GitHub (pinned to bd7dad7b09)

When it happens

Trigger: Thrown at lib/rouge/regex_lexer.rb:177 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rouge-ruby/rouge@bd7dad7b09 (2026-08-23). Data as JSON: /api/errors/0f43ac5191f4bf93. Report an issue: GitHub.