591961 - Allow to specify Javascript version when using jsdIStackFrame.eval()

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Jan Honza Odvarko [:Honza] (always need-info? me)]

This has been originally reported as Firebug issue here:
Issue 3358: let statements

It would be useful to specify which JS version should be used for evaluating. Something, which is already possible to do for <script> tags as follows:

<!-- Use version = 1.7 -->
<script type="application/javascript;version=1.7">
    let a='bar';
    console.log(a);
</script> 

The version could be specified as an additional argument to jsdIStackFrame.eval

boolean eval (in AString bytes, in AUTF8String fileName, in unsigned long line, out jsdIValue result);

Based on proposal here:
http://groups.google.com/group/mozilla.dev.apps.firefox/browse_thread/thread/b26ae02dc1baa707?hl=en

Not sure if this would also affect window.eval()

Honza

Comment 1

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Perhaps this could be part of new JSD2 effort?

I guess it could also be interesting for the Web Console.

Honza

Comment 2

[timeless]

it shouldn't affect window.eval - that's an api we share with other vendors (MS, Apple, ...).

I guess we could add an [optional] for it. I don't personally like messing with well established functions. You happen to be JS based and don't care, but not everyone is (and while [optional] doesn't break builds, it doesn't make method calls from C++ easy). I'd personally prefer at least initially to just add another method for it.

Comment 3

[Jan Honza Odvarko [:Honza] (always need-info? me)]

> I'd personally prefer at least initially to just add another method for it.
Agree

Honza

Comment 4

[Sebastian Zartner [:sebo]]

The new Firebug issue, that summarizes the problems caused by this lack of support is http://code.google.com/p/fbug/issues/detail?id=2244.

Sebastian

Comment 5

[Sebastian Zartner [:sebo]]

JavaScript versions are going to be retired soon, see bug 867609, so marking this as WONTFIX.

Sebastian