[antlr-interest] Throwing an excption in a Tree Action

[mzukowski at yci.com]

No, you currently can't specify specific Exceptions that a rule can throw.
You have to make sure that the exceptions you throw are subclasses of
RecognitionException.

Monty

> -----Original Message-----
> From: Niall Gormley [mailto:ngormley at hotmail.com]
> Sent: Thursday, June 20, 2002 8:35 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] Throwing an excption in a Tree Action
> 
> 
> Hi,
> 
> I would like to throw an exception in an action as per the 
> grammar below. Is 
> it possible to specify that it should throw my 
> InvalidAssignmentException 
> exception in the tree grammar?
> 
> Thanks Again,
> Niall
> 
> assignmentExpression
>   : #( ASSIGN i:IDENT p:primaryExpression)
>     {
>       System.out.println("Checking Assignment Statement: 
> "+#i.getText()
>                                                  +" "+#p.getText());
>       if(#i.getType()!=#p.getType())
>       {
>         throw new InvalidAssignmentException("Cannot assign"
>            + #i.getType() + " to " +  #p.getType());
>       }
>       else
>       {
>         System.out.println("Assingment OK");
>       }
>     }
>   ;
> 
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