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Code that lexes differently in ES3 vs ES3.1   Message List  
Reply | Forward Message #283 of 310 |
Re: [caplet] Code that lexes differently in ES3 vs ES3.1

On Feb 10, 2009, at 6:36 PM, Mike Samuel wrote:
> and there's the newlines in block comments thing return /*
> */ foo();
>

Fixed in Firefox 3.1 beta nightlies:

https://bugzilla.mozilla.org/show_bug.cgi?id=475834

We could push the fix back into a 3.0.x maintenance release if it
would help. Anyone with https://bugzilla.mozilla.org editbugs
permission who wants this, feel free to nominate the patch for approval.

/be
Wed Feb 11, 2009 3:10 am

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brendaneich
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Forward 		Message #283 of 310 |
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Consider the following JavaScript source: [ /[/]/ /foo]/ + bar According to the ES3 spec, this is interpreted as: [ new RegExp("[") ] / new RegExp("foo]") +... 		David-Sarah Hopwood
david.hopwood@...
Send Email 		Feb 9, 2009
5:16 pm

From what I remember this started out as a bug in IE and then Firefox followed suit for compatibility which left the other browsers with no choice. I can't...
Marcel Laverdet
marcel.laverdet
Offline Send Email 		Feb 9, 2009
5:43 pm

... No, other browsers followed suit first. ... https://bugzilla.mozilla.org/show_bug.cgi?id=309840 Quoting from comment 0: Description From Jesse Ruderman...
Brendan Eich
brendaneich
Offline Send Email 		Feb 9, 2009
6:55 pm

My apologies....
Marcel Laverdet
marcel.laverdet
Offline Send Email 		Feb 10, 2009
7:32 am

No need to apologize, and I did not aim to blame Opera or Safari in citing the record. This was not a situation where anyone fielding a browser compatible...
Brendan Eich
brendaneich
Offline Send Email 		Feb 10, 2009
9:07 am

... <https://bugzilla.mozilla.org/show_bug.cgi?id=309840#c12> # This fixes a highly dup'ed IE compatibility bug. It's an extension # to ECMA syntax that's...
David-Sarah Hopwood
david.hopwood@...
Send Email 		Feb 10, 2009
2:34 pm

... You're right, but so what? The IE bug and monopoly combined to create a de-facto standard. Appealing to the de-jure standard does you no good, and...
Brendan Eich
brendaneich
Offline Send Email 		Feb 10, 2009
7:13 pm

... I could, if I knew that there were no more bugs like this. Note that lexical confusion attacks of this kind can easily be turned into complete breaks of a...
David-Sarah Hopwood
david.hopwood@...
Send Email 		Feb 10, 2009
2:12 pm

... Plenty. But I suspect you know of them. There's conditional compilation comments /* @cc_on */, and there's the newlines in block comments thing return /*...
Mike Samuel
mikesamuel
Offline Send Email 		Feb 11, 2009
2:36 am

... Fixed in Firefox 3.1 beta nightlies: https://bugzilla.mozilla.org/show_bug.cgi?id=475834 We could push the fix back into a 3.0.x maintenance release if it ...
Brendan Eich
brendaneich
Offline Send Email 		Feb 11, 2009
3:10 am

... ADsafe rejects [ /[/]/ /foo]/ + bar. Just because ECMAScript says its ok doesn't mean that ADsafe must. ADsafe insists that all internal / must have \....
Douglas Crockford
douglascrock...
Offline Send Email 		Feb 9, 2009
9:17 pm

2009/2/9 Douglas Crockford <douglas@...> ... Cajita disallows regex literals, but Valija uses the ES3.1 rule for lexing regexs and rewrites [ /[/]/...
Mike Samuel
mikesamuel
Offline Send Email 		Feb 10, 2009
3:02 am

... I'm confused -- how does it know that the middle '/' in "/[/]/" is "internal"? Is it lexing according to the intersection of Pattern from section 15.10.1,...
David-Sarah Hopwood
david.hopwood@...
Send Email 		Feb 10, 2009
2:44 pm
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