[stringtemplate-interest] which ST errors are serious

[Terence Parr]

On Dec 1, 2009, at 7:55 AM, Brain, Jim wrote:

> If you have a listener concept in v4 and will pass the errors to the  
> listener, it seems to me that someone who needs Exceptions can just  
> throw the exception in the listener.

That's true. they can decide what's fatal. i'll have to pass more info  
to the listener this way though and can't manage a bitset of what to  
pay attention to.

> Is it common in systems to have a "conditional Exception system"  
> like this, where the same conditions may or may not throw Exceptions  
> depending on some configuration setting?  If so, I'm unfamiliar with  
> it.  From a language perspective, I much prefer Exceptions either be  
> "always" or "never", not "optional"

Well, in many ways it's a way to specify language semantics depending  
on your situation. Some rely on <a.b> being valid when b doesn't  
exist.  Some people consider it a programming error.  Both use cases  
are valid.

As u say, maybe pass everything to listener and it can decide...

Ter
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/stringtemplate-interest/attachments/20091201/a3fa96c8/attachment.html