Container::create() - Code Metrics - Inspection of "2.0.0" - mindplay-dk/unbox - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#7)

by Rasmus

created 2016-09-08 07:50 UTC

Container::create() A

↳ Parent: Container

Complexity

Conditions	4
Paths	4

Size

Total Lines	20
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	4

Importance

Changes	5
Bugs	0	Features	1

Metric	Value
c	5
b	0
f	1
dl	0
loc	20
ccs	10
cts	10
cp	1
rs	9.2
cc	4
eloc	10
nc	4
nop	2
crap	4

<?php

namespace mindplay\unbox;

use Interop\Container\ContainerInterface;
use InvalidArgumentException;
use ReflectionClass;
use ReflectionFunction;
use ReflectionParameter;

/**
 * This class implements a simple dependency injection container.
 */
class Container implements ContainerInterface, FactoryInterface
{
    /**
     * @var bool[] map where component name => TRUE, if the component has been initialized
     */
    protected $active = [];

    /**
     * @var mixed[] map where component name => value
     */
    protected $values = [];

    /**
     * @var callable[] map where component name => factory function
     */
    protected $factory = [];

    /**
     * @var array map where component name => mixed list/map of parameter names
     */
    protected $factory_map = [];

    /**
     * @var (callable[])[] map where component name => list of configuration functions
     */
    protected $config = [];

    /**
     * @var array map where component name => mixed list/map of parameter names
     */
    protected $config_map = [];

    /**
     * @param mixed[]        $values
     * @param callable[]     $factory
     * @param array          $factory_map
     * @param (callable[])[] $config
     * @param array          $config_map
     */
    public function __construct(array $values, array $factory, array $factory_map, array $config, array $config_map)
    {
        $this->values = $values +

            [
                get_class($this)          => $this,
                __CLASS__                 => $this,
                ContainerInterface::class => $this,
                FactoryInterface::class   => $this,
            ];

        $this->factory = $factory;
        $this->factory_map = $factory_map;
        $this->config = $config;
        $this->config_map = $config_map;
    }

    /**
     * Resolve the registered component with the given name.
     *
     * @param string $name component name
     *
     * @return mixed
     *
     * @throws ContainerException
     * @throws NotFoundException
     */
    public function get($name)
    {
        if (! isset($this->active[$name])) {
            if (isset($this->factory[$name])) {
                $factory = $this->factory[$name];

                $reflection = new ReflectionFunction($factory);

                $params = $this->resolve($reflection->getParameters(), $this->factory_map[$name]);

                $this->values[$name] = call_user_func_array($factory, $params);
            } elseif (!array_key_exists($name, $this->values)) {
                throw new NotFoundException($name);
            }

            $this->active[$name] = true;

            $this->initialize($name);
        }

        return $this->values[$name];
    }

    /**
     * Check for the existence of a component with a given name.
     *
     * @param string $name component name
     *
     * @return bool true, if a component with the given name has been defined
     */
    public function has($name)
    {
        return array_key_exists($name, $this->values) || isset($this->factory[$name]);
    }

    /**
     * Check if a component has been unboxed and is currently active.
     *
     * @param string $name component name
     *
     * @return bool
     */
    public function isActive($name)
    {
        return isset($this->active[$name]);
    }

    /**
     * Call any given callable, using dependency injection to satisfy it's arguments, and/or
     * manually specifying some of those arguments - then return the value from the call.
     *
     * This will work for any callable:
     *
     *     $container->call('foo');               // function foo()
     *     $container->call($foo, 'baz');         // instance method $foo->baz()
     *     $container->call([Foo::class, 'bar']); // static method Foo::bar()
     *     $container->call($foo);                // closure (or class implementing __invoke)
     *
     * In any of those examples, you can also supply custom arguments, either named or
     * positional, or mixed, as per the `$map` argument in `register()`, `configure()`, etc.
     *
     * See also {@see create()} which lets you invoke any constructor.
     *
     * @param callable|object $callback any arbitrary closure or callable, or object implementing __invoke()
     * @param mixed|mixed[]   $map      mixed list/map of parameter values (and/or boxed values)
     *
     * @return mixed return value from the given callable
     */
    public function call($callback, $map = [])
    {
        $params = Reflection::createFromCallable($callback)->getParameters();

        return call_user_func_array($callback, $this->resolve($params, $map));
    }

    /**
     * Create an instance of a given class.
     *
     * The container will internally resolve and inject any constructor arguments
     * not explicitly provided in the (optional) second parameter.
     *
     * @param string        $class_name fully-qualified class-name
     * @param mixed|mixed[] $map        mixed list/map of parameter values (and/or boxed values)
     *
     * @return mixed
     */
    public function create($class_name, $map = [])
    {
        if (!class_exists($class_name)) {
            throw new InvalidArgumentException("unable to create component: {$class_name}");
        }

        $reflection = new ReflectionClass($class_name);

        if (!$reflection->isInstantiable()) {
            throw new InvalidArgumentException("unable to create instance of abstract class: {$class_name}");
        }

        $constructor = $reflection->getConstructor();

        $params = $constructor
            ? $this->resolve($constructor->getParameters(), $map, false)
            : [];

        return $reflection->newInstanceArgs($params);
    }

    /**
     * Internally resolves parameters to functions or constructors.
     *
     * This is the heart of the beast.
     *
     * @param ReflectionParameter[] $params parameter reflections
     * @param array                 $map    mixed list/map of parameter values (and/or boxed values)
     * @param bool                  $safe   if TRUE, it's considered safe to resolve against parameter names
     *
     * @return array parameters
     *
     * @throws ContainerException
     * @throws NotFoundException
     */
    protected function resolve(array $params, $map, $safe = true)
    {
        $args = [];

        foreach ($params as $index => $param) {
            $param_name = $param->name;

            if (array_key_exists($param_name, $map)) {
                $value = $map[$param_name]; // // resolve as user-provided named argument
            } elseif (array_key_exists($index, $map)) {
                $value = $map[$index]; // resolve as user-provided positional argument
            } else {
                // as on optimization, obtain the argument type without triggering autoload:

                $type = Reflection::getParameterType($param);

                if ($type && isset($map[$type])) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
                    $value = $map[$type]; // resolve as user-provided type-hinted argument
                } elseif ($type && $this->has($type)) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
                    $value = $this->get($type); // resolve as component registered by class/interface name
                } elseif ($safe && $this->has($param_name)) {
                    $value = $this->get($param_name); // resolve as component with matching parameter name
                } elseif ($param->isOptional()) {
                    $value = $param->getDefaultValue(); // unresolved: resolve using default value
                } else {
                    // unresolved - throw a container exception:

                    $reflection = $param->getDeclaringFunction();

                    throw new ContainerException(
                        "unable to resolve parameter: \${$param_name} " . ($type ? "({$type}) " : "") .
                        "in file: " . $reflection->getFileName() . ", line " . $reflection->getStartLine()
                    );
                }
            }

            if ($value instanceof BoxedValueInterface) {
                $value = $value->unbox($this); // unbox a boxed value
            }

            $args[] = $value; // argument resolved!
        }

        return $args;
    }

    /**
     * Internally initialize an active component.
     *
     * @param string $name component name
     *
     * @return void
     */
    private function initialize($name)
    {
        if (isset($this->config[$name])) {
            foreach ($this->config[$name] as $index => $config) {
                $map = $this->config_map[$name][$index];

                $reflection = Reflection::createFromCallable($config);

                $params = $this->resolve($reflection->getParameters(), $map);

                $value = call_user_func_array($config, $params);

                if ($value !== null) {
                    $this->values[$name] = $value;
                }
            }
        }
    }
}


1		<?php
2
3		namespace mindplay\unbox;
4
5		use Interop\Container\ContainerInterface;
6		use InvalidArgumentException;
7		use ReflectionClass;
8		use ReflectionFunction;
9		use ReflectionParameter;
10
11		/**
12		* This class implements a simple dependency injection container.
13		*/
14		class Container implements ContainerInterface, FactoryInterface
15		{
16		/**
17		* @var bool[] map where component name => TRUE, if the component has been initialized
18		*/
19		protected $active = [];
20
21		/**
22		* @var mixed[] map where component name => value
23		*/
24		protected $values = [];
25
26		/**
27		* @var callable[] map where component name => factory function
28		*/
29		protected $factory = [];
30
31		/**
32		* @var array map where component name => mixed list/map of parameter names
33		*/
34		protected $factory_map = [];
35
36		/**
37		* @var (callable[])[] map where component name => list of configuration functions
38		*/
39		protected $config = [];
40
41		/**
42		* @var array map where component name => mixed list/map of parameter names
43		*/
44		protected $config_map = [];
45
46		/**
47		* @param mixed[] $values
48		* @param callable[] $factory
49		* @param array $factory_map
50		* @param (callable[])[] $config
51		* @param array $config_map
52		*/
53	1	public function __construct(array $values, array $factory, array $factory_map, array $config, array $config_map)
54		{
55	1	$this->values = $values +
		0 ignored issues – show Documentation Bug introduced 2016-09-08 07:54 UTC by Report Bug Copy Issue Report It seems like `$values + array(get_clas...erface::class => $this)` of type `array<integer\|string,>` is incompatible with the declared type `array<integer,>` of property `$values`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
56		[
57	1	get_class($this) => $this,
58	1	__CLASS__ => $this,
59	1	ContainerInterface::class => $this,
60	1	FactoryInterface::class => $this,
61	1	];
62
63	1	$this->factory = $factory;
64	1	$this->factory_map = $factory_map;
65	1	$this->config = $config;
66	1	$this->config_map = $config_map;
67	1	}
68
69		/**
70		* Resolve the registered component with the given name.
71		*
72		* @param string $name component name
73		*
74		* @return mixed
75		*
76		* @throws ContainerException
77		* @throws NotFoundException
78		*/
79	1	public function get($name)
80		{
81	1	if (! isset($this->active[$name])) {
82	1	if (isset($this->factory[$name])) {
83	1	$factory = $this->factory[$name];
84
85	1	$reflection = new ReflectionFunction($factory);
86
87	1	$params = $this->resolve($reflection->getParameters(), $this->factory_map[$name]);
88
89	1	$this->values[$name] = call_user_func_array($factory, $params);
90	1	} elseif (!array_key_exists($name, $this->values)) {
91	1	throw new NotFoundException($name);
92		}
93
94	1	$this->active[$name] = true;
95
96	1	$this->initialize($name);
97	1	}
98
99	1	return $this->values[$name];
100		}
101
102		/**
103		* Check for the existence of a component with a given name.
104		*
105		* @param string $name component name
106		*
107		* @return bool true, if a component with the given name has been defined
108		*/
109	1	public function has($name)
110		{
111	1	return array_key_exists($name, $this->values) \|\| isset($this->factory[$name]);
112		}
113
114		/**
115		* Check if a component has been unboxed and is currently active.
116		*
117		* @param string $name component name
118		*
119		* @return bool
120		*/
121	1	public function isActive($name)
122		{
123	1	return isset($this->active[$name]);
124		}
125
126		/**
127		* Call any given callable, using dependency injection to satisfy it's arguments, and/or
128		* manually specifying some of those arguments - then return the value from the call.
129		*
130		* This will work for any callable:
131		*
132		* $container->call('foo'); // function foo()
133		* $container->call($foo, 'baz'); // instance method $foo->baz()
134		* $container->call([Foo::class, 'bar']); // static method Foo::bar()
135		* $container->call($foo); // closure (or class implementing __invoke)
136		*
137		* In any of those examples, you can also supply custom arguments, either named or
138		* positional, or mixed, as per the `$map` argument in `register()`, `configure()`, etc.
139		*
140		* See also {@see create()} which lets you invoke any constructor.
141		*
142		* @param callable\|object $callback any arbitrary closure or callable, or object implementing __invoke()
143		* @param mixed\|mixed[] $map mixed list/map of parameter values (and/or boxed values)
144		*
145		* @return mixed return value from the given callable
146		*/
147	1	public function call($callback, $map = [])
148		{
149	1	$params = Reflection::createFromCallable($callback)->getParameters();
150
151	1	return call_user_func_array($callback, $this->resolve($params, $map));
152		}
153
154		/**
155		* Create an instance of a given class.
156		*
157		* The container will internally resolve and inject any constructor arguments
158		* not explicitly provided in the (optional) second parameter.
159		*
160		* @param string $class_name fully-qualified class-name
161		* @param mixed\|mixed[] $map mixed list/map of parameter values (and/or boxed values)
162		*
163		* @return mixed
164		*/
165	1	public function create($class_name, $map = [])
166		{
167	1	if (!class_exists($class_name)) {
168	1	throw new InvalidArgumentException("unable to create component: {$class_name}");
169		}
170
171	1	$reflection = new ReflectionClass($class_name);
172
173	1	if (!$reflection->isInstantiable()) {
174	1	throw new InvalidArgumentException("unable to create instance of abstract class: {$class_name}");
175		}
176
177	1	$constructor = $reflection->getConstructor();
178
179		$params = $constructor
180	1	? $this->resolve($constructor->getParameters(), $map, false)
181	1	: [];
182
183	1	return $reflection->newInstanceArgs($params);
184		}
185
186		/**
187		* Internally resolves parameters to functions or constructors.
188		*
189		* This is the heart of the beast.
190		*
191		* @param ReflectionParameter[] $params parameter reflections
192		* @param array $map mixed list/map of parameter values (and/or boxed values)
193		* @param bool $safe if TRUE, it's considered safe to resolve against parameter names
194		*
195		* @return array parameters
196		*
197		* @throws ContainerException
198		* @throws NotFoundException
199		*/
200	1	protected function resolve(array $params, $map, $safe = true)
201		{
202	1	$args = [];
203
204	1	foreach ($params as $index => $param) {
205	1	$param_name = $param->name;
206
207	1	if (array_key_exists($param_name, $map)) {
208	1	$value = $map[$param_name]; // // resolve as user-provided named argument
209	1	} elseif (array_key_exists($index, $map)) {
210	1	$value = $map[$index]; // resolve as user-provided positional argument
211	1	} else {
212		// as on optimization, obtain the argument type without triggering autoload:
213
214	1	$type = Reflection::getParameterType($param);
215
216	1	if ($type && isset($map[$type])) {
		0 ignored issues – show Bug Best Practice introduced 2016-01-21 20:03 UTC by Report Bug Copy Issue Report The expression `$type` of type `string\|null` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
217	1	$value = $map[$type]; // resolve as user-provided type-hinted argument
218	1	} elseif ($type && $this->has($type)) {
		0 ignored issues – show Bug Best Practice introduced 2016-01-21 20:03 UTC by Report Bug Copy Issue Report The expression `$type` of type `string\|null` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
219	1	$value = $this->get($type); // resolve as component registered by class/interface name
220	1	} elseif ($safe && $this->has($param_name)) {
221	1	$value = $this->get($param_name); // resolve as component with matching parameter name
222	1	} elseif ($param->isOptional()) {
223	1	$value = $param->getDefaultValue(); // unresolved: resolve using default value
224	1	} else {
225		// unresolved - throw a container exception:
226
227	1	$reflection = $param->getDeclaringFunction();
228
229	1	throw new ContainerException(
230	1	"unable to resolve parameter: \${$param_name} " . ($type ? "({$type}) " : "") .
231	1	"in file: " . $reflection->getFileName() . ", line " . $reflection->getStartLine()
232	1	);
233		}
234		}
235
236	1	if ($value instanceof BoxedValueInterface) {
237	1	$value = $value->unbox($this); // unbox a boxed value
238	1	}
239
240	1	$args[] = $value; // argument resolved!
241	1	}
242
243	1	return $args;
244		}
245
246		/**
247		* Internally initialize an active component.
248		*
249		* @param string $name component name
250		*
251		* @return void
252		*/
253	1	private function initialize($name)
254		{
255	1	if (isset($this->config[$name])) {
256	1	foreach ($this->config[$name] as $index => $config) {
257	1	$map = $this->config_map[$name][$index];
258
259	1	$reflection = Reflection::createFromCallable($config);
260
261	1	$params = $this->resolve($reflection->getParameters(), $map);
262
263	1	$value = call_user_func_array($config, $params);
264
265	1	if ($value !== null) {
266	1	$this->values[$name] = $value;
267	1	}
268	1	}
269	1	}
270	1	}
271		}
272

mindplay-dk / unbox

Pull Request — master (#7)

Container::create() A

Complexity

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Duplication

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