[Jython-checkins] SF.net SVN: jython:[5075] branches/asm/grammar/PythonWalker.g

[<fwi...@us...>]

Revision: 5075
          http://jython.svn.sourceforge.net/jython/?rev=5075&view=rev
Author:   fwierzbicki
Date:     2008-08-04 02:36:46 +0000 (Mon, 04 Aug 2008)

Log Message:
-----------
Some checks for assignment to None.

Modified Paths:
--------------
    branches/asm/grammar/PythonWalker.g

Modified: branches/asm/grammar/PythonWalker.g
===================================================================
--- branches/asm/grammar/PythonWalker.g	2008-08-04 01:15:48 UTC (rev 5074)
+++ branches/asm/grammar/PythonWalker.g	2008-08-04 02:36:46 UTC (rev 5075)
@@ -286,6 +286,12 @@
         }
         return new UnaryOp(t, unaryopType.USub, o);
     }
+
+    private void checkAssign(exprType e) {
+        if (e instanceof Name && ((Name)e).id.equals("None")) {
+            throw new ParseException("assignment to None", e);
+        }
+    }
 }
 
 @rulecatch {
@@ -336,6 +342,7 @@
 
 defparameter[List params, List defaults]
     : fpdef[expr_contextType.Param, null] (ASSIGN test[expr_contextType.Load])? {
+        checkAssign($fpdef.etype);
         params.add($fpdef.etype);
         if ($ASSIGN != null) {
             defaults.add($test.etype);
@@ -494,6 +501,7 @@
 
 target[List etypes]
     : ^(Target atom[expr_contextType.Store]) {
+        checkAssign($atom.etype);
         etypes.add($atom.etype);
     }
     ;
@@ -1343,6 +1351,7 @@
 
 keyword[List kws]
     : ^(Keyword ^(Arg arg=test[expr_contextType.Load]) ^(Value val=test[expr_contextType.Load])) {
+        checkAssign($arg.etype);
         kws.add(new keywordType($Keyword, $arg.text, $val.etype));
     }
     ;


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