module Dsl
  module StringHelperMethods
    def prefix_reserved_word_with_underscore!(word)
      gsub!(/\b(#{word})\b/, "_\\1")
    end
    
    def add_parenthesis!
      tokens = split(/\s+/)
      self.replace(tokens.join('(') + (')' * (tokens.length - 1)))
      gsub!(/,\)/, ",nil)")
    end
  end
end