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<?php
/**
* Mockery (https://docs.mockery.io/)
*
* @copyright https://github.com/mockery/mockery/blob/HEAD/COPYRIGHT.md
* @license https://github.com/mockery/mockery/blob/HEAD/LICENSE BSD 3-Clause License
* @link https://github.com/mockery/mockery for the canonical source repository
*/
namespace Mockery;
use Closure;
use ReflectionClass;
use UnexpectedValueException;
use InvalidArgumentException;
/**
* This is a trimmed down version of https://github.com/doctrine/instantiator,
* basically without the caching
*
* @author Marco Pivetta <ocramius@gmail.com>
*/
final class Instantiator
{
/**
* {@inheritDoc}
*/
public function instantiate($className)
{
$factory = $this->buildFactory($className);
$instance = $factory();
return $instance;
}
/**
* Builds a {@see \Closure} capable of instantiating the given $className without
* invoking its constructor.
*
* @param string $className
*
* @return Closure
*/
private function buildFactory($className)
{
$reflectionClass = $this->getReflectionClass($className);
if ($this->isInstantiableViaReflection($reflectionClass)) {
return function () use ($reflectionClass) {
return $reflectionClass->newInstanceWithoutConstructor();
};
}
$serializedString = sprintf(
'O:%d:"%s":0:{}',
strlen($className),
$className
);
$this->attemptInstantiationViaUnSerialization($reflectionClass, $serializedString);
return function () use ($serializedString) {
return unserialize($serializedString);
};
}
/**
* @param string $className
*
* @return ReflectionClass
*
* @throws InvalidArgumentException
*/
private function getReflectionClass($className)
{
if (! class_exists($className)) {
throw new InvalidArgumentException("Class:$className does not exist");
}
$reflection = new ReflectionClass($className);
if ($reflection->isAbstract()) {
throw new InvalidArgumentException("Class:$className is an abstract class");
}
return $reflection;
}
/**
* @param ReflectionClass $reflectionClass
* @param string $serializedString
*
* @throws UnexpectedValueException
*
* @return void
*/
private function attemptInstantiationViaUnSerialization(ReflectionClass $reflectionClass, $serializedString)
{
set_error_handler(function ($code, $message, $file, $line) use ($reflectionClass, & $error) {
$msg = sprintf(
'Could not produce an instance of "%s" via un-serialization, since an error was triggered in file "%s" at line "%d"',
$reflectionClass->getName(),
$file,
$line
);
$error = new UnexpectedValueException($msg, 0, new \Exception($message, $code));
});
try {
unserialize($serializedString);
} catch (\Exception $exception) {
restore_error_handler();
throw new UnexpectedValueException("An exception was raised while trying to instantiate an instance of \"{$reflectionClass->getName()}\" via un-serialization", 0, $exception);
}
restore_error_handler();
if ($error) {
throw $error;
}
}
/**
* @param ReflectionClass $reflectionClass
*
* @return bool
*/
private function isInstantiableViaReflection(ReflectionClass $reflectionClass)
{
return ! ($reflectionClass->isInternal() && $reflectionClass->isFinal());
}
/**
* Verifies whether the given class is to be considered internal
*
* @param ReflectionClass $reflectionClass
*
* @return bool
*/
private function hasInternalAncestors(ReflectionClass $reflectionClass)
{
do {
if ($reflectionClass->isInternal()) {
return true;
}
} while ($reflectionClass = $reflectionClass->getParentClass());
return false;
}
}