Ugh, you're right, that's totally unreadable... the => is far too ambiguous
with array syntax, I agree.
How about just a thin arrow?
(params) -> expr
If the parens around params were required, it's not ambiguous with the
trailing -- operator, is it?
$foo->bar(($baz) -> $baz + 1);
Consistent use of parens around the params might make closures a bit easier
to spot in the wild?
On Mon, Jun 5, 2017 at 8:11 PM, Björn Larsson <bjorn.x.lars...@telia.com>
wrote:
>
>
> Den 2017-06-05 kl. 19:55, skrev Rowan Collins:
>
>> On 5 June 2017 18:17:06 BST, Fleshgrinder <p...@fleshgrinder.com> wrote:
>>
>>> Could someone explain me again what the problem with the simple
>>> fat-arrow and normal parenthesis is? Cannot find it anymore (too many
>>> messages in too many thread I guess). I would guess that it has to do
>>> with the arbitrary look-ahead that is required to check for the fat
>>> arrow before the lexer knows that this is a short closure and not some
>>> parenthesis that simply groups something.
>>>
>> I think it's not just a case of implementation problems, it's actually
>> ambiguous with current syntax:
>>
>> $foo = array( ($x) => 42 );
>>
>> Sure, those inner brackets are redundant, so it's not likely to break
>> much actual code, but it's kind of weird to have this one case magically
>> turn into a closure, when anything else you put in those brackets would
>> just be used as the array key:
>>
>> $foo = array( f($x) => 42 );
>> $foo = array( ($x+1) => 42 );
>> $foo = array( (42) => $x );
>> $foo = array( (X) => 42 );
>> $foo = array( ($x) => 42 );
>> $foo = array( ("$x") => 42 );
>>
>> Even if we could teach the parser to understand it, I'd personally be
>> against it for the difficulty of *humans* parsing it. I find shorthand
>> closures hard enough to read anyway, especially when people suggest things
>> like ($x) => ($y) => $x * $y * $z;
>>
>> Regards,
>>
>> +1, think you nailed it here :) One of the reasons I prefer the ==>
> syntax.
>
> r//Björn
>
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
