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@dhotson
Created September 22, 2010 04:26
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<?php
// Define the 'class' class
$class = Obj()
->fn('new', function ($class) {
$newClass = Obj($class->methods)
->fn('new', function($class) {
$obj = Obj($class->imethods);
$args = func_get_args();
array_shift($args);
call_user_func_array(array($obj, 'init'), $args);
return $obj;
});
return $newClass;
})
->fn('def', function ($t, $name, $fn) {
$t->imethods[$name] = $fn;
return $t;
})
->fn('extend', function ($t) {
return clone $t;
});
// Define a new class
$animal = $class->new()
->def('init', function($t, $name) {
$t->name = $name;
})
->def('speak', function($t) {
echo "My name is $t->name\n";
});
// Extend a class
$dog = $animal->extend()
->def('speak', function($t) {
echo "My name is $t->name, I have just met you and I love you, SQUIRREL!\n";
})
->def('bark', function($t) {
echo "Woof!\n";
});
$jimmy = $animal->new('Jimmy');
$jimmy->speak();
$doug = $dog->new('Doug');
$doug->speak();
$doug->bark();
// ---- The guts...
class Obj
{
public function __construct($methods=array())
{
$this->methods = $methods;
}
public function method($name)
{
if (!isset($this->methods[$name]))
throw new BadMethodCallException();
return $this->methods[$name];
}
public function fn($name, $fn)
{
$this->methods[$name] = $fn;
return $this;
}
public function __call($name, $args)
{
return call_user_func_array(
$this->method($name),
array_merge(array($this), $args)
);
}
}
// Allow chaining method calls off the constructor..
function Obj($methods=array())
{
return new Obj($methods);
}
@klang
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klang commented Sep 22, 2010

yeah .. 5.3 .. I am actually looking forward to the day we upgrade our production environment to that version .. it's going to be a total map/reduce party!

@dhotson
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dhotson commented Sep 22, 2010

Heh.. it's funny you should mention that. We recently deployed 5.3 on our production servers, which led me to thinking about what kind of crazy evil stuff I could implement using closures. This is the result.

@leeoniya
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a good amount of overhead, but you can get around the serialization problem via:
http://github.com/jeremeamia/super_closure

@dhotson
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dhotson commented Sep 22, 2010

Hah, that's a pretty cool hack. /impressed

@jubianchi
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very interesting!

@Jalopy
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Jalopy commented Sep 22, 2010

I like it :)

@brennen
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brennen commented Sep 23, 2010

Neat.

@jbrumwell
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Very cool, could be a good way to implement inceptors, sequences. tried an implementation http://gist.github.com/594135/ haven't tested it at all though

@Gorcyn
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Gorcyn commented Sep 24, 2010

Definitely not OO !

@julioprotzek
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Cool stuff!

@rhowardiv
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Forked with view to providing a replacement for StdClass that allows you to attach callable methods to.

@igorzg
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igorzg commented Sep 16, 2013

This pattern is mostly used in javascript.

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