Injector::invoke() - Code Metrics - Inspection of "Simplify invoke()" - yiisoft/injector - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#7)

by Alexander

created 2020-04-07 14:57 UTC

Injector::invoke() A

↳ Parent: Injector

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	1

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	1
eloc	3
c	2
b	0
f	0
nc	1
nop	2
dl	0
loc	5
ccs	4
cts	4
cp	1
crap	1
rs	10

<?php

declare(strict_types=1);

namespace Yiisoft\Injector;

use Psr\Container\ContainerExceptionInterface;
use Psr\Container\ContainerInterface;
use Psr\Container\NotFoundExceptionInterface;
use ReflectionException;

/**
 * Injector is able to analyze callable dependencies based on
 * type hinting and inject them from any PSR-11 compatible container.
 */
final class Injector
{
    private ContainerInterface $container;

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    /**
     * Invoke a callback with resolving dependencies based on parameter types.
     *
     * This methods allows invoking a callback and let type hinted parameter names to be
     * resolved as objects of the Container. It additionally allow calling function passing named arguments.
     *
     * For example, the following callback may be invoked using the Container to resolve the formatter dependency:
     *
     * ```php
     * $formatString = function($string, \Yiisoft\I18n\MessageFormatterInterface $formatter) {
     *    // ...
     * }
     *
     * $injector = new Yiisoft\Injector\Injector($container);
     * $injector->invoke($formatString, ['string' => 'Hello World!']);
     * ```
     *
     * This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
     * by the DI container as the second argument.
     *
     * @param callable $callable callable to be invoked.
     * @param array $arguments The array of the function arguments.
     * This can be either a list of arguments, or an associative array where keys are argument names.
     * @return mixed the callable return value.
     * @throws MissingRequiredArgumentException if required argument is missing.
     * @throws ContainerExceptionInterface if a dependency cannot be resolved or if a dependency cannot be fulfilled.
     * @throws ReflectionException
     */
    public function invoke(callable $callable, array $arguments = [])
    {
        $callable = \Closure::fromCallable($callable);
        $reflection = new \ReflectionFunction($callable);
        return $reflection->invokeArgs($this->resolveDependencies($reflection, $arguments));
    }

    /**
     * Creates an object of a given class with resolving constructor dependencies based on parameter types.
     *
     * This methods allows invoking a constructor and let type hinted parameter names to be
     * resolved as objects of the Container. It additionally allow calling constructor passing named arguments.
     *
     * For example, the following constructor may be invoked using the Container to resolve the formatter dependency:
     *
     * ```php
     * class StringFormatter
     * {
     *     public function __construct($string, \Yiisoft\I18n\MessageFormatterInterface $formatter)
     *     {
     *         // ...
     *     }
     * }
     *
     * $injector = new Yiisoft\Injector\Injector($container);
     * $stringFormatter = $injector->make(StringFormatter::class, ['string' => 'Hello World!']);
     * ```
     *
     * This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
     * by the DI container as the second argument.
     *
     * @param string $class name of the class to be created.
     * @param array $arguments The array of the function arguments.
     * This can be either a list of arguments, or an associative array where keys are argument names.
     * @return mixed object of the given class.
     * @throws ContainerExceptionInterface
     * @throws MissingRequiredArgumentException|InvalidArgumentException
     * @throws ReflectionException
     */
    public function make(string $class, array $arguments = [])
    {
        $classReflection = new \ReflectionClass($class);
        if (!$classReflection->isInstantiable()) {
            throw new \InvalidArgumentException("Class $class is not instantiable.");
        }
        $reflection = $classReflection->getConstructor();
        if ($reflection === null) {
            // Method __construct() does not exist
            return new $class();
        }

        return new $class(...$this->resolveDependencies($reflection, $arguments));
    }

    /**
     * Resolve dependencies for the given function reflection object and a list of concrete arguments
     * and return array of arguments to call the function with.
     *
     * @param \ReflectionFunctionAbstract $reflection function reflection.
     * @param array $arguments concrete arguments.
     * @return array resolved arguments.
     * @throws ContainerExceptionInterface
     * @throws MissingRequiredArgumentException|InvalidArgumentException
     * @throws ReflectionException
     */
    private function resolveDependencies(\ReflectionFunctionAbstract $reflection, array $arguments = []): array
    {
        $resolvedArguments = [];

        $pushUnusedArguments = true;
        foreach ($reflection->getParameters() as $parameter) {
            $name = $parameter->getName();
            $class = $parameter->getClass();
            $hasType = $parameter->hasType();
            $isNullable = $parameter->allowsNull() && $hasType;
            $isVariadic = $parameter->isVariadic();
            $error = null;
            unset($tmpValue);

            // Get argument by name
            if (array_key_exists($name, $arguments)) {
                if ($isVariadic && is_array($arguments[$name])) {
                    $resolvedArguments = array_merge($resolvedArguments, array_values($arguments[$name]));
                } else {
                    $resolvedArguments[] = &$arguments[$name];
                }
                unset($arguments[$name]);
                continue;
            }

            $type = $hasType ? $parameter->getType()->getName() : null;
            if ($class !== null || $type === 'object') {
                // Unnamed arguments
                $className = $class !== null ? $class->getName() : null;
                $found = false;
                foreach ($arguments as $key => $item) {
                    if (!is_int($key)) {
                        continue;
                    }
                    if (is_object($item) and $className === null || $item instanceof $className) {
                        $found = true;
                        $resolvedArguments[] = &$arguments[$key];
                        unset($arguments[$key], $item);
                        if (!$isVariadic) {
                            break;
                        }
                    }
                }
                if ($found) {
                    $pushUnusedArguments = false;
                    continue;
                }

                if ($className !== null) {
                    // If the argument is optional we catch not instantiable exceptions
                    try {
                        $tmpValue = $this->container->get($className);
                        $resolvedArguments[] = &$tmpValue;
                        continue;
                    } catch (NotFoundExceptionInterface $e) {
                        $error = $e;
                    }
                }
            }

            if ($parameter->isDefaultValueAvailable()) {
                $tmpValue = $parameter->getDefaultValue();
                $resolvedArguments[] = &$tmpValue;
            } elseif (!$parameter->isOptional()) {
                if ($isNullable) {
                    $tmpValue = null;
                    $resolvedArguments[] = &$tmpValue;
                } else {
                    throw $error ?? new MissingRequiredArgumentException($name, $reflection->getName());
                }
            } elseif ($hasType) {
                $pushUnusedArguments = false;
            }
        }

        foreach ($arguments as $key => $value) {
            if (is_int($key)) {
                if (!is_object($value)) {
                    throw new InvalidArgumentException((string)$key, $reflection->getName());
                }
                if ($pushUnusedArguments) {
                    $resolvedArguments[] = $value;
                }
            }
        }
        return $resolvedArguments;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Yiisoft\Injector;
6
7		use Psr\Container\ContainerExceptionInterface;
8		use Psr\Container\ContainerInterface;
9		use Psr\Container\NotFoundExceptionInterface;
10		use ReflectionException;
11
12		/**
13		* Injector is able to analyze callable dependencies based on
14		* type hinting and inject them from any PSR-11 compatible container.
15		*/
16		final class Injector
17		{
18		private ContainerInterface $container;
19
20	45	public function __construct(ContainerInterface $container)
21		{
22	45	$this->container = $container;
23		}
24
25		/**
26		* Invoke a callback with resolving dependencies based on parameter types.
27		*
28		* This methods allows invoking a callback and let type hinted parameter names to be
29		* resolved as objects of the Container. It additionally allow calling function passing named arguments.
30		*
31		* For example, the following callback may be invoked using the Container to resolve the formatter dependency:
32		*
33		* ```php
34		* $formatString = function($string, \Yiisoft\I18n\MessageFormatterInterface $formatter) {
35		* // ...
36		* }
37		*
38		* $injector = new Yiisoft\Injector\Injector($container);
39		* $injector->invoke($formatString, ['string' => 'Hello World!']);
40		* ```
41		*
42		* This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
43		* by the DI container as the second argument.
44		*
45		* @param callable $callable callable to be invoked.
46		* @param array $arguments The array of the function arguments.
47		* This can be either a list of arguments, or an associative array where keys are argument names.
48		* @return mixed the callable return value.
49		* @throws MissingRequiredArgumentException if required argument is missing.
50		* @throws ContainerExceptionInterface if a dependency cannot be resolved or if a dependency cannot be fulfilled.
51		* @throws ReflectionException
52		*/
53	34	public function invoke(callable $callable, array $arguments = [])
54		{
55	34	$callable = \Closure::fromCallable($callable);
56	34	$reflection = new \ReflectionFunction($callable);
57	34	return $reflection->invokeArgs($this->resolveDependencies($reflection, $arguments));
58		}
59
60		/**
61		* Creates an object of a given class with resolving constructor dependencies based on parameter types.
62		*
63		* This methods allows invoking a constructor and let type hinted parameter names to be
64		* resolved as objects of the Container. It additionally allow calling constructor passing named arguments.
65		*
66		* For example, the following constructor may be invoked using the Container to resolve the formatter dependency:
67		*
68		* ```php
69		* class StringFormatter
70		* {
71		* public function __construct($string, \Yiisoft\I18n\MessageFormatterInterface $formatter)
72		* {
73		* // ...
74		* }
75		* }
76		*
77		* $injector = new Yiisoft\Injector\Injector($container);
78		* $stringFormatter = $injector->make(StringFormatter::class, ['string' => 'Hello World!']);
79		* ```
80		*
81		* This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
82		* by the DI container as the second argument.
83		*
84		* @param string $class name of the class to be created.
85		* @param array $arguments The array of the function arguments.
86		* This can be either a list of arguments, or an associative array where keys are argument names.
87		* @return mixed object of the given class.
88		* @throws ContainerExceptionInterface
89		* @throws MissingRequiredArgumentException\|InvalidArgumentException
90		* @throws ReflectionException
91		*/
92	11	public function make(string $class, array $arguments = [])
93		{
94	11	$classReflection = new \ReflectionClass($class);
95	10	if (!$classReflection->isInstantiable()) {
96	3	throw new \InvalidArgumentException("Class $class is not instantiable.");
97		}
98	7	$reflection = $classReflection->getConstructor();
99	7	if ($reflection === null) {
100		// Method __construct() does not exist
101	1	return new $class();
102		}
103
104	6	return new $class(...$this->resolveDependencies($reflection, $arguments));
105		}
106
107		/**
108		* Resolve dependencies for the given function reflection object and a list of concrete arguments
109		* and return array of arguments to call the function with.
110		*
111		* @param \ReflectionFunctionAbstract $reflection function reflection.
112		* @param array $arguments concrete arguments.
113		* @return array resolved arguments.
114		* @throws ContainerExceptionInterface
115		* @throws MissingRequiredArgumentException\|InvalidArgumentException
116		* @throws ReflectionException
117		*/
118	40	private function resolveDependencies(\ReflectionFunctionAbstract $reflection, array $arguments = []): array
119		{
120	40	$resolvedArguments = [];
121
122	40	$pushUnusedArguments = true;
123	40	foreach ($reflection->getParameters() as $parameter) {
124	35	$name = $parameter->getName();
125	35	$class = $parameter->getClass();
126	35	$hasType = $parameter->hasType();
127	35	$isNullable = $parameter->allowsNull() && $hasType;
128	35	$isVariadic = $parameter->isVariadic();
129	35	$error = null;
130	35	unset($tmpValue);
131
132		// Get argument by name
133	35	if (array_key_exists($name, $arguments)) {
134	8	if ($isVariadic && is_array($arguments[$name])) {
135	1	$resolvedArguments = array_merge($resolvedArguments, array_values($arguments[$name]));
136		} else {
137	7	$resolvedArguments[] = &$arguments[$name];
138		}
139	8	unset($arguments[$name]);
140	8	continue;
141		}
142
143	31	$type = $hasType ? $parameter->getType()->getName() : null;
144	31	if ($class !== null \|\| $type === 'object') {
145		// Unnamed arguments
146	23	$className = $class !== null ? $class->getName() : null;
147	23	$found = false;
148	23	foreach ($arguments as $key => $item) {
149	11	if (!is_int($key)) {
150	1	continue;
151		}
152	10	if (is_object($item) and $className === null \|\| $item instanceof $className) {
153	9	$found = true;
154	9	$resolvedArguments[] = &$arguments[$key];
155	9	unset($arguments[$key], $item);
156	9	if (!$isVariadic) {
157	5	break;
158		}
159		}
160		}
161	23	if ($found) {
162	9	$pushUnusedArguments = false;
163	9	continue;
164		}
165
166	19	if ($className !== null) {
167		// If the argument is optional we catch not instantiable exceptions
168		try {
169	18	$tmpValue = $this->container->get($className);
170	16	$resolvedArguments[] = &$tmpValue;
171	16	continue;
172	4	} catch (NotFoundExceptionInterface $e) {
173	4	$error = $e;
174		}
175		}
176		}
177
178	16	if ($parameter->isDefaultValueAvailable()) {
179	2	$tmpValue = $parameter->getDefaultValue();
180	2	$resolvedArguments[] = &$tmpValue;
181	14	} elseif (!$parameter->isOptional()) {
182	10	if ($isNullable) {
183	3	$tmpValue = null;
184	3	$resolvedArguments[] = &$tmpValue;
185		} else {
186	10	throw $error ?? new MissingRequiredArgumentException($name, $reflection->getName());
187		}
188	4	} elseif ($hasType) {
189	2	$pushUnusedArguments = false;
190		}
191		}
192
193	33	foreach ($arguments as $key => $value) {
194	7	if (is_int($key)) {
195	7	if (!is_object($value)) {
196	2	throw new InvalidArgumentException((string)$key, $reflection->getName());
197		}
198	5	if ($pushUnusedArguments) {
199	2	$resolvedArguments[] = $value;
200		}
201		}
202		}
203	31	return $resolvedArguments;
204		}
205		}
206

yiisoft / injector

Pull Request — master (#7)

Injector::invoke() A

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Duplication

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