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Re: [FileAPI] File.slice spec bug

From: Charles Pritchard <chuck@jumis.com>
Date: Tue, 12 Apr 2011 13:45:44 -0700
Message-Id: <D92B48BB-F7D4-4B94-9875-077A42BB570A@jumis.com>
Cc: Kyle Huey <me@kylehuey.com>, Jian Li <jianli@chromium.org>, "arun@mozilla.com" <arun@mozilla.com>, Darin Fisher <darin@chromium.org>, Maciej Stachowiak <mjs@apple.com>, Jonas Sicking <jonas@sicking.cc>, Web Applications Working Group WG <public-webapps@w3.org>, Eric Uhrhane <ericu@google.com>
To: Dmitry Titov <dimich@chromium.org>
We're using ArrayBuffer... It's been through a few changes of its own relating to slice.

I think they just went the route of renaming the method.

-Charles



On Apr 12, 2011, at 1:36 PM, Dmitry Titov <dimich@chromium.org> wrote:

> Indeed, it appeared in FF 4 which was shipped end of March, so if it was only FF API, it would be fine to change it since it's only been official for a couple of weeks.
> 
> However in Chrome this was shipped August 2010, and in Safari sometime in 2010 I think. Oprah seems also support it, although I don't know for how long.
> This could give plenty of time to developers to start using the API, so I can see how it would give us a pause while considering such a change...
> 
> Dmitry
> 
> 
> On Tue, Apr 12, 2011 at 1:15 PM, Kyle Huey <me@kylehuey.com> wrote:
> First supported in Firefox in Firefox 4, if that is unclear.
> 
> 
> On Tue, Apr 12, 2011 at 1:14 PM, Kyle Huey <me@kylehuey.com> wrote:
> File.slice was first supported in Firefox 4.
> 
> - Kyle
> 
> 
> On Tue, Apr 12, 2011 at 1:08 PM, Jian Li <jianli@chromium.org> wrote:
> The biggest concern is that this is a breaking change and quite a few web applications have already been using it. As far as I know, File.slice(start, length) has been supported as early as Chrome 6 and Safari 5. Also Firefox 3 is supporting it. How do we communicate with web developers about this breaking change if we decide to make the change?
> 
> Jian 
> 
> 
> On Tue, Apr 12, 2011 at 11:34 AM, Arun Ranganathan <arun@mozilla.com> wrote:
> On 4/12/11 2:24 PM, Jonas Sicking wrote:
> Hi All,
> 
> It was recently (yesterday) pointed out to me that we let a bad
> spec-bug slip through for File.slice. It doesn't match the argument
> semantics of Array.slice which can be very confusing for developers.
> 
> In Array.slice the second argument is the index of the last item to be
> included in the returned slice.
> In File.slice the second argument is the number of bytes included in
> the returned slices.
> 
> In other words, it's Array.slice(start, end), but File.slice(start, length).
> 
> Additionally, in Array.slice the second argument is optional.
> 
> File.slice is currently shipped by Chrome and Firefox 4. I would be
> fine with fixing this in Firefox 4.0.1, however that only makes sense
> if the chrome folks are fine with fixing it in their implementation.
> 
> So consider this an official request, would chrome be ok with changing
> the spec here?
> 
> / Jonas
> 
> 
> I'm bummed that we collectively let this slip through the cracks, and personally think it's early enough to fix it.  But we should also decide how closely to match Array.slice.  Should we allow code of the sort
> 
> file.slice(-80)?
> 
> Code of that sort is allowed with Array.slice.
> 
> MDC has good developer docs about what's in Firefox for Array.slice:
> 
> https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/slice
> 
> Developers may have already discovered file.slice (e.g. see http://hacks.mozilla.org/2011/04/resumeupload/), so fixing this will involve some messaging.
> 
> -- A*
> 
> 
> 
> 
> 
Received on Tuesday, 12 April 2011 20:46:15 GMT

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