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Date: Thu, 19 Jul 2012 19:58:14 +1000
To: Paul Dragoonis <dragoonis@gmail.com>, internals@lists.php.net
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Subject: Re: [PHP-DEV] Make try/catch brackets optinal
From: charlie@charliesomerville.com (Charlie Somerville)

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On Thursday, 19 July 2012 at 7:49 PM, Paul Dragoonis wrote:

> Why is your try block only going to contain 1 line, and that's
> throwing an exception=3F=3F
> =20
> try
> throw new Exception('foobar');
> catch(Exception =24e)
> =20
> =20

Because it's a contrived example. He's not trying to write real code, he'=
s trying to demonstrate his point - and you totally missed that point. =20

> Braces are a good thing, they give structure and stop people from
> mis-reading things and writing bugs, the same can be said for the if()
> situation.
> =20
> 1) Braces are good.
This is subjective. There are some cases where it might improve code read=
ability to drop the braces for a single-statement try/catch.


There's certainly no technical barrier to doing this. I'm not familiar wi=
th PHP's parser, but I'd imagine there would be some kind of 'statement' =
non-terminal that would handle single statements as well as a braced grou=
p of statements.

> 2) Try with only one line in it to throw an exception doesn't seem
> like a realistic situation.
> =20
> =20

There could be some utility to this. =46or example, as well as having pos=
t-fix if, unless, etc., Ruby also has a post-fix 'rescue'. Here's a silly=
 example of its use:


    some=5Fvar =3D foo.bar rescue =22oops=22

If 'foo.bar' threw an exception, some=5Fvar would contain =22oops=22 inst=
ead.

I think PHP could benefit from having a single statement try form. I ofte=
n turn to PHP for quick and dirty scripts when I need to do something wit=
h little fuss. I think having try/catch support brace-less single stateme=
nts would help increase consistency in PHP's syntax, as well as be useful=
 in certain situations. =20

On Thursday, 19 July 2012 at 7:49 PM, Paul Dragoonis wrote:

> =20
> -1 from me, sorry Hoa.
> =20
> On Thu, Jul 19, 2012 at 10:44 AM, Ivan Enderlin =40 Hoa
> <ivan.enderlin=40hoa-project.net (mailto:ivan.enderlin=40hoa-project.ne=
t)> wrote:
> > Hi internals,
> > =20
> > As you certainly know, brackets defining blocks in PHP are optional i=
f
> > blocks contain a single instruction. Thus:
> > =20
> > if(=24condition) =7B
> > echo 'foobar';
> > =7D
> > =20
> > is strictly equivalent to:
> > =20
> > if(=24condition)
> > echo 'foobar';
> > =20
> > But this syntactic sugar is not applied uniformly to all PHP language=

> > constructions. I have the try/catch couple in mind.
> > =46irst, I would like to know why it is not possible to write:
> > =20
> > try
> > throw new Exception('foobar');
> > catch(Exception =24e)
> > var=5Fdump(=24e->getMessage());
> > =20
> > as a strict equivalence of:
> > =20
> > try =7B
> > throw new Exception('foobar');
> > =7D
> > catch(Exception =24e) =7B
> > var=5Fdump(=24e->getMessage());
> > =7D
> > =20
> > Second, if it is possible, could we plan to have this =E2=80=9Cfeatur=
e=E2=80=9D (uniformity
> > actually) in PHP6 (or maybe before)=3F
> > =20
> > Best regards.
> > =20
> > --
> > Ivan Enderlin
> > Developer of Hoa
> > http://hoa.42/ or http://hoa-project.net/
> > =20
> > PhD. student at DISC/=46emto-ST (Vesontio) and INRIA (Cassis)
> > http://disc.univ-fcomte.fr/ and http://www.inria.fr/
> > =20
> > Member of HTML and WebApps Working Group of W3C
> > http://w3.org/
> > =20
> > =20
> > =20
> > --
> > PHP Internals - PHP Runtime Development Mailing List
> > To unsubscribe, visit: http://www.php.net/unsub.php
> > =20
> =20
> =20
> -- =20
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
> =20
> =20



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