From: Young tae Kim <philos99@...>
Date: 2009-03-10T03:47:53+09:00
Subject: Treetop Parser whitespace

I can't understand why the following test fails.
Could you tell me why? Thanks, in advance.


# in arithmetic.treetop

grammar Arithmetic
  rule white_space
    [ \t\n\r]+ {
      def value
        text_value
      end
    }
  end
end





# in test_parser.rb
require "rubygems"
require "treetop"
require "arithmetic"

parser = ArithmeticParser.new

p parser.parse("   \n\t\r")




# the execution result
$ ruby test_parser.rb
nil
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