Re: [Concept] Flip relative function lookup order (global, then local)

From: Date: Fri, 23 Aug 2024 12:04:22 +0000
Subject: Re: [Concept] Flip relative function lookup order (global, then local)
References: 1 2 3 4 5 6 7 8  Groups: php.internals 
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> On Aug 23, 2024, at 7:50 AM, Rowan Tommins [IMSoP] <[email protected]> wrote:
> 
> On Fri, 23 Aug 2024, at 12:29, Mike Schinkel wrote:
>> namespace \AcmeComponents\SplineReticulator\Utilities\Text
>> 
>> function Foo():int {
>> 	return Text\strlen("Hello World");
>> }
>> 
>> The above of course could result in BC breaks IF there happened to be 
>> existing code that referenced Text\strlen() where Text was a top-level 
>> namespace
> 
> It wouldn't be a top-level namespace that would cause a conflict, but a nested one:
> currently the above code resolves the function name as
> "AcmeComponents\SplineReticulator\Utilities\Text\Text\strlen" (note the
> "...\Text\Text\...").

How often does that really occur in the wild?  

And how can it occur without an explicit use
AcmeComponents\SplineReticulator\Utilities\Text\Text statement, which I proposed would
override the automatic use, anyway?

> It's an interesting suggestion, but I'm not totally sold on "use the end of the
> current namespace" being easier to remember than "use this symbol or keyword".
> 
> return namespace\strlen("Hello World"); # current syntax, rather long and unclear
> return _\strlen("Hello World"); # short, but maybe a bit cryptic
> return Text\strlen("Hello World"); # variable length, relies on current context
> return NS\strlen("Hello World"); # shortening of current keyword
> return self\strlen("Hello World"); # maybe confusing to reuse a keyword?
> return current\strlen("Hello World"); # clear, but a bit long

The only one of those that has a strong analog to existing PHP code is to "use the end of the
current namespace" as people frequently do with explicit use statements.

Yes, self has a weak analog to self::, but none of the others even come
close, IMO. And adding self\ may have unintended to the language, some slight BC
concerns, and/or downstream consequences for other projects  vs. a simple automatic
use.

Lastly, no comment on \\?

-Mike


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