Viewing file:  Instantiator.php (6.73 KB) -rw-r--r--
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<?php
/*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the MIT license. For more information, see
* <http://www.doctrine-project.org>.
*/
namespace Mockery;
use Closure;
use Exception;
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
{
/**
* Markers used internally by PHP to define whether {@see \unserialize} should invoke
* the method {@see \Serializable::unserialize()} when dealing with classes implementing
* the {@see \Serializable} interface.
*/
const SERIALIZATION_FORMAT_USE_UNSERIALIZER = 'C';
const SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O';
/**
* {@inheritDoc}
*/
public function instantiate($className)
{
$factory = $this->buildFactory($className);
$instance = $factory();
$reflection = new ReflectionClass($instance);
return $instance;
}
/**
* @internal
* @private
*
* Builds a {@see \Closure} capable of instantiating the given $className without
* invoking its constructor.
* This method is only exposed as public because of PHP 5.3 compatibility. Do not
* use this method in your own code
*
* @param string $className
*
* @return Closure
*/
public function buildFactory($className)
{
$reflectionClass = $this->getReflectionClass($className);
if ($this->isInstantiableViaReflection($reflectionClass)) {
return function () use ($reflectionClass) {
return $reflectionClass->newInstanceWithoutConstructor();
};
}
$serializedString = sprintf(
'%s:%d:"%s":0:{}',
$this->getSerializationFormat($reflectionClass),
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 $reflectionClass)
{
if (\PHP_VERSION_ID >= 50600) {
return ! ($reflectionClass->isInternal() && $reflectionClass->isFinal());
}
return \PHP_VERSION_ID >= 50400 && ! $this->hasInternalAncestors($reflectionClass);
}
/**
* 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;
}
/**
* Verifies if the given PHP version implements the `Serializable` interface serialization
* with an incompatible serialization format. If that's the case, use serialization marker
* "C" instead of "O".
*
* @link http://news.php.net/php.internals/74654
*
* @param ReflectionClass $reflectionClass
*
* @return string the serialization format marker, either self::SERIALIZATION_FORMAT_USE_UNSERIALIZER
* or self::SERIALIZATION_FORMAT_AVOID_UNSERIALIZER
*/
private function getSerializationFormat(ReflectionClass $reflectionClass)
{
if ($this->isPhpVersionWithBrokenSerializationFormat()
&& $reflectionClass->implementsInterface('Serializable')
) {
return self::SERIALIZATION_FORMAT_USE_UNSERIALIZER;
}
return self::SERIALIZATION_FORMAT_AVOID_UNSERIALIZER;
}
/**
* Checks whether the current PHP runtime uses an incompatible serialization format
*
* @return bool
*/
private function isPhpVersionWithBrokenSerializationFormat()
{
return PHP_VERSION_ID === 50429 || PHP_VERSION_ID === 50513;
}
}
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