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@ 2018-05-30T18:26:23Z

<?php

# basic container
class Container
{
    private $raw;    // callbacks
    private $values; // objects
    private $locked;
    
    public function __construct(array $config = [])
    {
        foreach($config as $id => $callback){
            $this->set($id, $callback);
        }
    }
    
    public function set(string $id, callable $callback): void
    {
        if(isset($this->locked[$id])){
            throw new LockedIdException();
        }
        $this->raw[$id] = $callback;
    }
    
    public function get(string $id)
    {
        if(!isset($this->raw[$id])){
            throw new UnknownIdException();
        }
        
        if(isset($this->values[$id])){
            return $this->values[$id];
        }
        
        $cb = $this->raw[$id];
        $val = $this->values[$id] = $cb($this);
        $this->locked[$id] = true;
        
        return $val;
    }

    public function has(string $id): bool
    {
        return isset($this->values[$id]);
    }
}

class Resolver
{
    public function __construct(Container $container, WireRule ...$rules)
    {
        $this->c = $container;
        $this->rules = $rules;
    }

    public function get(string $class)
    {
        if(!$this->c->has($class)){
            $this->c->set($class, $this->resolve($class));
        }
        return $this->c->get($class);
    }

    public function resolve(string $class): callable
    {
        if(!class_exists($class)){
            throw new UnknownIdException();
        }
        
        if(!method_exists($class, '__construct')){
            return function(Container $c) use ($class){ return new $class; };
        }
        
        $constructor = new \ReflectionMethod($class, '__construct');
        
        if(count($params = $constructor->getParameters()) === 0){
            return function(Container $c) use ($class){ return new $class; };
        }
        
        foreach($params as $param){
            $args[] = $param->hasType() ? $this->getArgument($param->getType()->__toString()) : null;
        }
        
        return function(Container $c) use ($class, $args){ 
            return new $class(...$args); 
        };
    }
    
    public function getArgument(string $type)
    {
        foreach($this->rules as $rule){
            if($rule->match($type)){
                $type = $rule->getWiredClass($type);
            }
        }
        
        return $type ? $this->get($type) : null;
    }
}

class Foo { public function __construct(Bar $bar){ $this->bar = $bar; }}
class Bar { public function __construct(Baz $baz){ $this->baz = $baz; }}
class Baz {}

$c = new Resolver(new Container);

var_dump($c->get(Foo::class));

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Deprecated: Creation of dynamic property Resolver::$c is deprecated in /in/orktj on line 52 Deprecated: Creation of dynamic property Resolver::$rules is deprecated in /in/orktj on line 53 Deprecated: Creation of dynamic property Bar::$baz is deprecated in /in/orktj on line 102 Deprecated: Creation of dynamic property Foo::$bar is deprecated in /in/orktj on line 101 object(Foo)#4 (1) { ["bar"]=> object(Bar)#6 (1) { ["baz"]=> object(Baz)#8 (0) { } } }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Creation of dynamic property Resolver::$c is deprecated in /in/orktj on line 52 Deprecated: Creation of dynamic property Resolver::$rules is deprecated in /in/orktj on line 53 Deprecated: Creation of dynamic property Bar::$baz is deprecated in /in/orktj on line 102 Deprecated: Creation of dynamic property Foo::$bar is deprecated in /in/orktj on line 101 object(Foo)#4 (1) { ["bar"]=> object(Bar)#6 (1) { ["baz"]=> object(Baz)#8 (0) { } } }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: object(Foo)#4 (1) { ["bar"]=> object(Bar)#6 (1) { ["baz"]=> object(Baz)#8 (0) { } } }
Output for 7.4.0 - 7.4.33: Deprecated: Function ReflectionType::__toString() is deprecated in /in/orktj on line 81 Deprecated: Function ReflectionType::__toString() is deprecated in /in/orktj on line 81 object(Foo)#4 (1) { ["bar"]=> object(Bar)#6 (1) { ["baz"]=> object(Baz)#8 (0) { } } }

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