module Imbecile

  class Token

    # @return [String]
    #   Token name.
    attr_reader :name

    # @return [String]
    #   Token pattern.
    attr_reader :pattern

    # @return [Integer]
    #   Token ID.
    attr_reader :id

    # @return [Regex::NFA]
    #   Regex NFA for matching the token.
    attr_reader :nfa

    def initialize(name, pattern, id)
      @name = name
      @pattern = pattern
      @id = id
      regex = Regex.new(pattern)
      regex.nfa.end_state.accepts = self
      @nfa = regex.nfa
    end

    def c_name
      @name.upcase
    end

    def to_s
      @name
    end

  end

end