redid while with brackets and just one condition expression

lib/parser/control.rb

@@ -7,7 +7,9 @@ module Parser
       end
     
     rule(:while_do) do
-      keyword_while  >> expressions_do.as(:while_cond)  >> expressions_end.as(:body)
+      keyword_while  >> left_parenthesis >> expression.as(:while_cond)  >> right_parenthesis >> 
+                                                                    keyword_do >> newline >> 
+                              expressions_end.as(:body)
     end
   end
 end

lib/parser/transform.rb

@@ -25,7 +25,7 @@ module Parser
          end
 
     rule(:while     => simple(:while),
-         :while_cond => { :expressions => sequence(:while_cond) , :do => simple(:do)} , 
+         :while_cond => simple(:while_cond) , :do => simple(:do) , 
          :body => {:expressions => sequence(:body) , :end => simple(:e) }) do
            Ast::WhileExpression.new(while_cond, body) 
          end