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Re: Single-line comments

From: Glen <glen.84@gmail.com>
Date: Sat, 03 Apr 2010 22:08:38 +0200
Message-ID: <4BB7A046.4090704@gmail.com>
To: François REMY <fremycompany_pub@yahoo.fr>
CC: Brad Kemper <brad.kemper@gmail.com>, www-style@w3.org
I see.

Well, I don't think it's a huge optimization that should prevent 
single-line comments from being implemented. UAs can simply be changed 
to collapse spaces/tabs only, right?

On 2010/04/03 21:29, François REMY wrote:
> No, it seems Brad is speaking here about two specific problems :
>     a {
> property: //value;
>     }
> should not be parsed otherly than { "property": "//value"; } because
> '/' is an accepted char for the property values and is actually used
> in some of the latest specs.
> So, we should accept // only after a break ({, ;) and there's a 
> problem here
> because some UA's are collapsing every space char (including line feeds)
> to a single space char.
> The problem would then become very visible :
> a {
> // non-ok : value;
>     ok: value;
> }
> <== UA Optimisation (discarding space chars after the first) ==>
> a { // non-ok : value; ok: value; }
> So UA's with such optimisation would not be able to apply a // comment.
> Or at least, they would need to remove the optimisation.
>
> *From:* Glen <mailto:glen.84@gmail.com>
> *Sent:* Saturday, April 03, 2010 9:16 PM
> *To:* Brad Kemper <mailto:brad.kemper@gmail.com>
> *Cc:* François REMY <mailto:fremycompany_pub@yahoo.fr> ; 
> www-style@w3.org <mailto:www-style@w3.org>
> *Subject:* Re: Single-line comments
>
> On 2010/04/03 20:46, Brad Kemper wrote:
>> I think as long as it was outside of the rule block and before the 
>> line feed character, it would just get thrown away, and the practical 
>> effect would often be the same as a comment. But if the white space 
>> (including line feeds) was ever collapsed into a single space (as 
>> some existing editors or optimizers might do), then it would 
>> interfere with the next selector.
>>
>> Anyway, the WG discussed the proposal on 2010-03-24, and it is in the 
>> minutes. The issue was closed.
>
> I didn't know it was discussed in the meeting, no one even replied to 
> my initial message to the list. RESOLVED with a question mark after a 
> short discussion -- interesting.
>
> The biggest point against it seems to be compatibility with older 
> browsers, which I addressed in my previous message.
>
>> On Apr 3, 2010, at 10:59 AM, François REMY wrote:
>>
>>> No theorical objection. They are practical objections though. How 
>>> will it work
>>> when you use // comments with 'old' browsers ? It will not work. So 
>>> you can't
>>> use it in a safe way.
>>>
>>> *From:* Glen <mailto:glen.84@gmail.com>
>>> *Sent:* Saturday, April 03, 2010 7:26 PM
>>> *To:* www-style@w3.org <mailto:www-style@w3.org>
>>> *Subject:* Re: Single-line comments
>>>
>>> No replies? Does that mean no objections? :-)
>>>
>>> On 2010/03/19 21:08, Glen wrote:
>>>> Hi,
>>>>
>>>> Has there ever been any discussion regarding the addition of 
>>>> single-line comments?  //color: red;
>>>>
>>>> It's a lot faster to type when you just want to toggle a single 
>>>> declaration. It's also obviously useful for permanent comments 
>>>> where multiple lines are not required.
>>>>
>>>> Glen.
>>
Received on Saturday, 3 April 2010 20:09:27 GMT

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