Instantiator::hasInternalAncestors() - Code Metrics - doctrine/instantiator - Measure and Improve Code Quality continuously with Scrutinizer

Instantiator::hasInternalAncestors() A
last analyzed 2020-05-30 16:15 UTC

↳ Parent: Instantiator

Complexity

Conditions	3
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	3

Importance

Changes

Metric	Value
dl	0
loc	12
ccs	6
cts	6
cp	1
rs	9.8666
c	0
b	0
f	0
cc	3
nc	2
nop	1
crap	3

<?php

namespace Doctrine\Instantiator;

use ArrayIterator;
use Doctrine\Instantiator\Exception\InvalidArgumentException;
use Doctrine\Instantiator\Exception\UnexpectedValueException;
use Exception;
use ReflectionClass;
use ReflectionException;
use Serializable;
use function class_exists;
use function is_subclass_of;
use function restore_error_handler;
use function set_error_handler;
use function sprintf;
use function strlen;
use function unserialize;

/**
 * {@inheritDoc}
 */
final class Instantiator implements InstantiatorInterface
{
    /**
     * 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.
     */
    public const SERIALIZATION_FORMAT_USE_UNSERIALIZER   = 'C';
    public const SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O';

    /**
     * Used to instantiate specific classes, indexed by class name.
     *
     * @var callable[]
     */
    private static $cachedInstantiators = [];

    /**
     * Array of objects that can directly be cloned, indexed by class name.
     *
     * @var object[]
     */
    private static $cachedCloneables = [];

    /**
     * {@inheritDoc}
     */
    public function instantiate($className)
    {
        if (isset(self::$cachedCloneables[$className])) {
            return clone self::$cachedCloneables[$className];
        }

        if (isset(self::$cachedInstantiators[$className])) {
            $factory = self::$cachedInstantiators[$className];

            return $factory();
        }

        return $this->buildAndCacheFromFactory($className);
    }

    /**
     * Builds the requested object and caches it in static properties for performance
     *
     * @return object
     */
    private function buildAndCacheFromFactory(string $className)
    {
        $factory  = self::$cachedInstantiators[$className] = $this->buildFactory($className);
        $instance = $factory();

        if ($this->isSafeToClone(new ReflectionClass($instance))) {
            self::$cachedCloneables[$className] = clone $instance;
        }

        return $instance;
    }

    /**
     * Builds a callable capable of instantiating the given $className without
     * invoking its constructor.
     *
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     * @throws ReflectionException
     */
    private function buildFactory(string $className) : callable
    {
        $reflectionClass = $this->getReflectionClass($className);

        if ($this->isInstantiableViaReflection($reflectionClass)) {
            return [$reflectionClass, 'newInstanceWithoutConstructor'];
        }

        $serializedString = sprintf(
            '%s:%d:"%s":0:{}',
            is_subclass_of($className, Serializable::class) ? self::SERIALIZATION_FORMAT_USE_UNSERIALIZER : self::SERIALIZATION_FORMAT_AVOID_UNSERIALIZER,

            strlen($className),
            $className
        );

        $this->checkIfUnSerializationIsSupported($reflectionClass, $serializedString);

        return static function () use ($serializedString) {
            return unserialize($serializedString);
        };
    }

    /**
     * @throws InvalidArgumentException
     * @throws ReflectionException
     */
    private function getReflectionClass(string $className) : ReflectionClass
    {
        if (! class_exists($className)) {
            throw InvalidArgumentException::fromNonExistingClass($className);
        }

        $reflection = new ReflectionClass($className);

        if ($reflection->isAbstract()) {
            throw InvalidArgumentException::fromAbstractClass($reflection);
        }

        return $reflection;
    }

    /**
     * @throws UnexpectedValueException
     */
    private function checkIfUnSerializationIsSupported(ReflectionClass $reflectionClass, string $serializedString) : void
    {
        set_error_handler(static function (int $code, string $message, string $file, int $line) use ($reflectionClass, &$error) : bool {
            $error = UnexpectedValueException::fromUncleanUnSerialization(
                $reflectionClass,
                $message,
                $code,
                $file,
                $line
            );

            return true;
        });

        try {
            $this->attemptInstantiationViaUnSerialization($reflectionClass, $serializedString);
        } finally {
            restore_error_handler();
        }

        if ($error) {
            throw $error;
        }
    }

    /**
     * @throws UnexpectedValueException
     */
    private function attemptInstantiationViaUnSerialization(ReflectionClass $reflectionClass, string $serializedString) : void
    {
        try {
            unserialize($serializedString);
        } catch (Exception $exception) {
            throw UnexpectedValueException::fromSerializationTriggeredException($reflectionClass, $exception);
        }
    }

    private function isInstantiableViaReflection(ReflectionClass $reflectionClass) : bool
    {
        return ! ($this->hasInternalAncestors($reflectionClass) && $reflectionClass->isFinal());
    }

    /**
     * Verifies whether the given class is to be considered internal
     */
    private function hasInternalAncestors(ReflectionClass $reflectionClass) : bool
    {
        do {
            if ($reflectionClass->isInternal()) {
                return true;
            }

            $reflectionClass = $reflectionClass->getParentClass();
        } while ($reflectionClass);

        return false;
    }

    /**
     * Checks if a class is cloneable
     *
     * Classes implementing `__clone` cannot be safely cloned, as that may cause side-effects.
     */
    private function isSafeToClone(ReflectionClass $reflection) : bool
    {
        return $reflection->isCloneable()
            && ! $reflection->hasMethod('__clone')
            && ! $reflection->isSubclassOf(ArrayIterator::class);
    }
}


1		<?php
2
3		namespace Doctrine\Instantiator;
4
5		use ArrayIterator;
6		use Doctrine\Instantiator\Exception\InvalidArgumentException;
7		use Doctrine\Instantiator\Exception\UnexpectedValueException;
8		use Exception;
9		use ReflectionClass;
10		use ReflectionException;
11		use Serializable;
12		use function class_exists;
13		use function is_subclass_of;
14		use function restore_error_handler;
15		use function set_error_handler;
16		use function sprintf;
17		use function strlen;
18		use function unserialize;
19
20		/**
21		* {@inheritDoc}
22		*/
23		final class Instantiator implements InstantiatorInterface
24		{
25		/**
26		* Markers used internally by PHP to define whether {@see \unserialize} should invoke
27		* the method {@see \Serializable::unserialize()} when dealing with classes implementing
28		* the {@see \Serializable} interface.
29		*/
30		public const SERIALIZATION_FORMAT_USE_UNSERIALIZER = 'C';
31		public const SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O';
32
33		/**
34		* Used to instantiate specific classes, indexed by class name.
35		*
36		* @var callable[]
37		*/
38		private static $cachedInstantiators = [];
39
40		/**
41		* Array of objects that can directly be cloned, indexed by class name.
42		*
43		* @var object[]
44		*/
45		private static $cachedCloneables = [];
46
47		/**
48		* {@inheritDoc}
49		*/
50	42	public function instantiate($className)
51		{
52	42	if (isset(self::$cachedCloneables[$className])) {
53	10	return clone self::$cachedCloneables[$className];
54		}
55
56	33	if (isset(self::$cachedInstantiators[$className])) {
57	10	$factory = self::$cachedInstantiators[$className];
58
59	10	return $factory();
60		}
61
62	23	return $this->buildAndCacheFromFactory($className);
63		}
64
65		/**
66		* Builds the requested object and caches it in static properties for performance
67		*
68		* @return object
69		*/
70	23	private function buildAndCacheFromFactory(string $className)
71		{
72	23	$factory = self::$cachedInstantiators[$className] = $this->buildFactory($className);
73	18	$instance = $factory();
74
75	18	if ($this->isSafeToClone(new ReflectionClass($instance))) {
76	10	self::$cachedCloneables[$className] = clone $instance;
77		}
78
79	18	return $instance;
80		}
81
82		/**
83		* Builds a callable capable of instantiating the given $className without
84		* invoking its constructor.
85		*
86		* @throws InvalidArgumentException
87		* @throws UnexpectedValueException
88		* @throws ReflectionException
89		*/
90	23	private function buildFactory(string $className) : callable
91		{
92	23	$reflectionClass = $this->getReflectionClass($className);
93
94	19	if ($this->isInstantiableViaReflection($reflectionClass)) {
95	16	return [$reflectionClass, 'newInstanceWithoutConstructor'];
96		}
97
98	3	$serializedString = sprintf(
99	3	'%s:%d:"%s":0:{}',
100	3	is_subclass_of($className, Serializable::class) ? self::SERIALIZATION_FORMAT_USE_UNSERIALIZER : self::SERIALIZATION_FORMAT_AVOID_UNSERIALIZER,
		0 ignored issues – show Bug introduced 2019-10-21 15:00 UTC by Report Bug Copy Issue Report Due to PHP Bug #53727, `is_subclass_of` might return inconsistent results on some PHP versions if `\Serializable::class` can be an interface. If so, you could instead use `ReflectionClass::implementsInterface`. Loading history...
101	3	strlen($className),
102	3	$className
103		);
104
105	3	$this->checkIfUnSerializationIsSupported($reflectionClass, $serializedString);
106
107		return static function () use ($serializedString) {
108	4	return unserialize($serializedString);
109	2	};
110		}
111
112		/**
113		* @throws InvalidArgumentException
114		* @throws ReflectionException
115		*/
116	23	private function getReflectionClass(string $className) : ReflectionClass
117		{
118	23	if (! class_exists($className)) {
119	3	throw InvalidArgumentException::fromNonExistingClass($className);
120		}
121
122	20	$reflection = new ReflectionClass($className);
123
124	20	if ($reflection->isAbstract()) {
125	1	throw InvalidArgumentException::fromAbstractClass($reflection);
126		}
127
128	19	return $reflection;
129		}
130
131		/**
132		* @throws UnexpectedValueException
133		*/
134	3	private function checkIfUnSerializationIsSupported(ReflectionClass $reflectionClass, string $serializedString) : void
135		{
136		set_error_handler(static function (int $code, string $message, string $file, int $line) use ($reflectionClass, &$error) : bool {
137	1	$error = UnexpectedValueException::fromUncleanUnSerialization(
138	1	$reflectionClass,
139	1	$message,
140	1	$code,
141	1	$file,
142	1	$line
143		);
144
145	1	return true;
146	3	});
147
148		try {
149	3	$this->attemptInstantiationViaUnSerialization($reflectionClass, $serializedString);
150	3	} finally {
151	3	restore_error_handler();
152		}
153
154	3	if ($error) {
155	1	throw $error;
156		}
157	2	}
158
159		/**
160		* @throws UnexpectedValueException
161		*/
162	3	private function attemptInstantiationViaUnSerialization(ReflectionClass $reflectionClass, string $serializedString) : void
163		{
164		try {
165	3	unserialize($serializedString);
166		} catch (Exception $exception) {
167		throw UnexpectedValueException::fromSerializationTriggeredException($reflectionClass, $exception);
168		}
169	3	}
170
171	19	private function isInstantiableViaReflection(ReflectionClass $reflectionClass) : bool
172		{
173	19	return ! ($this->hasInternalAncestors($reflectionClass) && $reflectionClass->isFinal());
174		}
175
176		/**
177		* Verifies whether the given class is to be considered internal
178		*/
179	19	private function hasInternalAncestors(ReflectionClass $reflectionClass) : bool
180		{
181		do {
182	19	if ($reflectionClass->isInternal()) {
183	14	return true;
184		}
185
186	14	$reflectionClass = $reflectionClass->getParentClass();
187	14	} while ($reflectionClass);
188
189	5	return false;
190		}
191
192		/**
193		* Checks if a class is cloneable
194		*
195		* Classes implementing `__clone` cannot be safely cloned, as that may cause side-effects.
196		*/
197	18	private function isSafeToClone(ReflectionClass $reflection) : bool
198		{
199	18	return $reflection->isCloneable()
200	18	&& ! $reflection->hasMethod('__clone')
201	18	&& ! $reflection->isSubclassOf(ArrayIterator::class);
202		}
203		}
204

doctrine / instantiator

Instantiator::hasInternalAncestors() A last analyzed 2020-05-30 16:15 UTC

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Instantiator::hasInternalAncestors() A
last analyzed 2020-05-30 16:15 UTC