module Namarara
  class Lexer < Rly::Lex
    attr_reader :logger

    ignore "\t\n "

    # token :SPACE, /\s+/
    token :L_PAR, /\(/
    token :R_PAR, /\)/
    token :NUMBER, /[0-9]+(\.[0-9]+)?/
    token :STRING, /"([^"]*)"/ do |s|
      s.value.gsub!(/"(.*)"/, '\1')
      s
    end

    token :EQ_OP, /\=/
    token :T_BOOL, /true/i
    token :F_BOOL, /false/i
    token :VAR, /[a-z][a-zA-Z0-9_]+/
    token :AND_OP, /AND/
    token :OR_OP, /OR/
    token :NOT_OP, /NOT/

    def initialize(logger = nil)
      @logger = logger
      super()
    end

    on_error do |t|
      unless t.lexer.logger.nil?
        t.lexer.logger.error "Illegal character #{t.value}"
      end
      t.lexer.pos += 1
      nil
    end
  end # class
end # module