# File lib/liquid/parser.rb, line 47 def expression token = @tokens[@p] if token[0] == :id variable_signature elsif [:string, :number].include? token[0] consume elsif token.first == :open_round consume first = expression consume(:dotdot) last = expression consume(:close_round) "(#{first}..#{last})" else raise SyntaxError, "#{token} is not a valid expression" end end