Equivalent of nonassoc precedence #109

Activity

1. nobodxbodon commented on Jul 7, 2021

   

   nobodxbodon

   on Jul 7, 2021

   Contributor

   More actions

   Here's a test case with nonassoc:

   rply/tests/test_parser.py

   Line 245 in 19a9e08

   def test_default_reductions(self):
2. Zelatrix commented on Jul 7, 2021

   

   Zelatrix

   on Jul 7, 2021

   Last edited by Zelatrix

   Author

   More actions

   I did this in my parser, and it sees the integer token 5 and complains because it was expecting a parenthesis. Have I missed something?

            precedence = [
                        ('left', ['PLUS', 'STAR', 'SLASH']),
                        ('nonassoc', ['MINUS'])
                        ]
   
           @self.pg.production('expr : MINUS LEFT_PAR expr RIGHT_PAR')
           def uneg_expr(p):
               return UNeg(self.builder, self.module, p[2])

   If the code I compile is

   print(-(5))
   

   instead of

   print(-5)
   

   it works
3. nobodxbodon commented on Jul 7, 2021

   

   nobodxbodon

   on Jul 7, 2021

   Contributor

   More actions

   I'm afraid I don't see how nonassoc would help making -(5) equivalent with -5. Have you achieved this using PLY?
4. Zelatrix commented on Jul 7, 2021

   

   Zelatrix

   on Jul 7, 2021

   Author

   More actions

   I've not achieved it yet, I'm trying to achieve it at the moment.