W3C home > Mailing lists > Public > public-script-coord@w3.org > October to December 2011

[Bug 14878] Rename const to legacyconst

From: <bugzilla@jessica.w3.org>
Date: Wed, 23 Nov 2011 21:24:27 +0000
To: public-script-coord@w3.org
Message-Id: <E1RTKIt-0007HT-QE@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=14878

Tab Atkins Jr. <jackalmage@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jackalmage@gmail.com

--- Comment #17 from Tab Atkins Jr. <jackalmage@gmail.com> 2011-11-23 21:24:26 UTC ---
(In reply to comment #16)
> (In reply to comment #15)
> > For dense sets in [0,31], bitfields are still more verbose and less usable. 
> > You have
> > 
> >   if (foo & Foo.a & Foo.b & ~Foo.c & Foo.d)
> > vs.
> >   if (foo.a && foo.b && !foo.c && foo.d)
> 
> Read what I wrote again: union, intersection, differencing. I never write
> "membership testing". Yeesh.
> 
> Your overlong comment ignores actual use-cases of numeric consts in WebIDL,
> notably https://www.khronos.org/registry/webgl/specs/1.0/.
> 
> Do not impose policy at the level of mechanism.

The only case of a bitfield I could find in WebGL was the argument to the
clear() function, which seems to be bad in similar ways to other things argued
in this thread.

WebGL makes extensive use of constants as simple arguments (not, as far as I
can tell, useful to use as sets which can be unioned, intersected, or
differenced), which appears to also be bad in the way already argued in this
thread.  All of these appear to exist solely because of copypasta from the C
API, and could be replaced by a string instead in the JS API which would be
shorter and likely more readable.  In some cases, like getParameter and
getBufferParameter, the API is *really* bad and should, in JS, just be
individual properties or methods.  I would hope you're not arguing for that
pattern to be something to design towards!  Overall, the WebGL API is
*horrible* from a JS standpoint, purely so it can interoperate more directly
with the C API.

There are some valid uses of constants within JS.  The Math object exposes
several.  The TypedArray objects expose their width as constants as well. 
These are much rarer than the bad uses.

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Received on Wednesday, 23 November 2011 21:24:33 UTC

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