[Compiler-sig] funcdef parameters

[Finn Bock]

Hi,

I'm trying to understand the 'arguments' production.

	arguments = (identifier* args, identifier? vararg, 
		     identifier? kwarg, expr* defaults)

First, I'll ignore the posibility of tuple parameter.

I'm guessing that 'vararg' is what is called 'starargs' in the Call
ctor. I'm also guessing that 'defaults' contain the keyword values like
this:


   def foo(a, b, c=1, d=2, *lst, *kw): pass
->
   arguments([a, b, c, d], lst, kw, [1, 2])

or maybe?

   arguments([a, b, c, d], lst, kw, [None, None, 1, 2])



Second, we have to add tuple parameters and the simplest way I can see
looks like this.

@@ -85,8 +85,11 @@
        except = (expr? type, assign? name, stmt* body)

        -- XXX need to handle 'def f((a, b)):'
-       arguments = (identifier* args, identifier? vararg,
+       arguments = (fpdef* args, identifier? vararg,
                     identifier? kwarg, expr* defaults)
+
+        fpdef = FpList(fpdef* list)
+              | FpName(identifier id)

         -- keyword arguments supplied to call
         keyword = (identifier arg, expr value)


regards,
finn