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[Bug 10623] Simplify Web IDL exceptions

From: <bugzilla@jessica.w3.org>
Date: Thu, 13 Oct 2011 05:14:16 +0000
To: public-script-coord@w3.org
Message-Id: <E1REDcW-0002N7-FY@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10623

Garrett <dhtmlkitchen@gmail.com> changed:

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                 CC|                            |dhtmlkitchen@gmail.com

--- Comment #17 from Garrett <dhtmlkitchen@gmail.com> 2011-10-13 05:14:15 UTC ---
(In reply to comment #16)
> (In reply to comment #15)
> > I defined something like what you suggested now.
> > 
> > http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-throw
> > 
> > This should basically allow everyone to mint new DOMException values. When they
> > happen to be one of the types that has a legacy code exception field value code
> > will be set appropriately.
> 
> Great!
> 
> > Should we have a central registry somewhere (maybe in form of a wiki) where
> > specifications can note additional exception types and descriptions? (They do
> > not need the legacy code field value.)
> 
> Yes, I think that is a good idea.  Repurpose
> http://wiki.whatwg.org/wiki/Exception_Codes?
> 
> One final thing to wonder is whether new exception types (ones that don't have
> a legacy code) should use use Error rather than DOMException.
If you want to keep DOMException, then make its [[Prototype]] be EcmaScript
Error; e.g. -

 try { 
   document.createElement("<<") 
 } catch(ex) { 
   alert( ex instanceof Error);
 }

- to result true. Keep `ex.code == 5` for legacy reasons.

There are a few benefits to having the thrown object be a standard EcmaScript
Error, as specified by ES. There is no duplication of `message`, `name`,
properties, et al because Error instances have those. And because it is an
Error, there is no specification duplication and no concurrency issues to worry
about.

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Received on Thursday, 13 October 2011 05:14:28 UTC

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