On Sat, Apr 14, 2012 at 9:50 PM, Ralph Schindler
<ra...@ralphschindler.com> wrote:
> Hi all,
>
> There are many different use cases were in code we expect classes names as
> arguments to functions as fully qualified names. We do this in ZF a lot
> with our Service Location and DI components, but also with our code
> reflection API, etc. A more interesting use case I would like to call out
> is with PHPUnit, for example in a test, you might find this:
>
> $mock = $this->getMock('A\Namespaced\ClassName');
>
> This becomes cumbersome when you are dealing with lots of strings about lots
> of class names. This is also an area where, currently, namespace
> declaration and use statements offer no real support.
>
> The patch located here:
>
> https://github.com/ralphschindler/php-src/commit/02210d51851a96d723fbedcfc64cde9f9ae2b22a
>
> ... implements the ability for a developer to leverage the file's namespace
> declaration and use statements to be able to produce a scalar (string) of
> the class name that can be then used, for example, as an argument to a
> function elsewhere.
>
> This overloads the "class" keyword, and by virtue of the existing usage of
> "class" this feature is completely backwards compatible. All existing tests
> pass. For example, the above PHPUnit snipped would become:
>
> use A\Namespaced\ClassName;
> $mock = $this->getMock(ClassName::class);
>
> Another example with reflection:
>
> use SomeOther\FullyNamespaced\ClassElsewhere as CE;
> $r = new ReflectionClass(CE::class);
>
> More examples from the test file:
>
> namespace Foo\Bar {
> class Baz {}
> var_dump(Moo::CLASS); // "Foo\Bar\Moo"
> }
>
> namespace {
> use Bee\Bop as Moo,
> Foo\Bar\Baz;
>
> var_dump(Baz::class); // "Foo\Bar\Baz"
> var_dump(Boo::class); // "Boo"
> var_dump(Moo::CLASS); // "Bee\Bop"
> var_dump(\Moo::Class); // "Moo"
>
> $class = Baz::class; // assign class as scalar to var
> $x = new $class;
> var_dump($x); object(Foo\Bar\Baz)#1 (0) {}
> }
>
>
> What do you guys think?
Hey Ralph!
I like the proposal :)
A quick note on the patch: As the class name is compile-time
resolvable it should in my eyes also be available as a
`static_scalar`, so that it can be used in initialization lists:
public function doFoo($withClass = ABC::class) {
new $withClass; // or whatever
}
To be available as both a `static_scalar` and a general `scalar` one
should put the rule in the `common_scalar` section.
What do you think?
Nikita
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
