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<?php
/**
* @package Warp Theme Framework
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
namespace Warp;
/**
* Dependency injection container class.
*
* Based on Pimple (https://github.com/fabpot/Pimple, Fabien Potencier <fabien@symfony.com>, MIT License)
*/
class Warp implements \ArrayAccess
{
protected $values = array();
/**
* Instantiate the container.
*
* Objects and parameters can be passed as argument to the constructor.
*
* @param array $values The parameters or objects.
*/
public function __construct(array $values = array())
{
$self = $this;
$this->values = $values;
// register helpers
foreach ($this['config']->get('helper', array()) as $name => $class) {
$this[$name] = $this->share(function($self) use ($class) {
return new $class($self);
});
}
}
/**
* Sets a parameter or an object.
* Objects must be defined as Closures.
*
* Allowing any PHP callable leads to difficult to debug problems
* as function names (strings) are callable (creating a function with
* the same a name as an existing parameter would break your container).
*
* @param string $id The unique identifier for the parameter or object
* @param mixed $value The value of the parameter or a closure to defined an object
*/
public function offsetSet($id, $value)
{
$this->values[$id] = $value;
}
/**
* Gets a parameter or an object.
*
* @param string $id The unique identifier for the parameter or object
*
* @return mixed The value of the parameter or an object
*
* @throws InvalidArgumentException if the identifier is not defined
*/
public function offsetGet($id)
{
if (!array_key_exists($id, $this->values)) {
throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id));
}
$isFactory = is_object($this->values[$id]) && method_exists($this->values[$id], '__invoke');
return $isFactory ? $this->values[$id]($this) : $this->values[$id];
}
/**
* Checks if a parameter or an object is set.
*
* @param string $id The unique identifier for the parameter or object
*
* @return Boolean
*/
public function offsetExists($id)
{
return array_key_exists($id, $this->values);
}
/**
* Unsets a parameter or an object.
*
* @param string $id The unique identifier for the parameter or object
*/
public function offsetUnset($id)
{
unset($this->values[$id]);
}
/**
* Returns a closure that stores the result of the given closure for
* uniqueness in the scope of this instance.
*
* @param Closure $callable A closure to wrap for uniqueness
*
* @return Closure The wrapped closure
*/
public static function share(\Closure $callable)
{
return function ($c) use ($callable) {
static $object;
if (null === $object) {
$object = $callable($c);
}
return $object;
};
}
}