Promise::__construct() - Code Metrics - dazzle-php/promise - Measure and Improve Code Quality continuously with Scrutinizer

Promise::__construct() B
last analyzed 2017-07-23 19:08 UTC

↳ Parent: Promise

Complexity

Conditions	5
Paths	1

Size

Total Lines	20
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	5.9256

Importance

Changes

Metric	Value
dl	0
loc	20
ccs	8
cts	12
cp	0.6667
rs	8.8571
c	0
b	0
f	0
cc	5
eloc	12
nc	1
nop	2
crap	5.9256

<?php

namespace Dazzle\Promise;

use Dazzle\Promise\Partial\PromiseTrait;
use Error;
use Exception;

class Promise implements PromiseInterface
{
    use PromiseTrait;

    /**
     * @var PromiseInterface|null
     */
    protected $result;

    /**
     * @var callable[]
     */
    protected $handlers;

    /**
     * @var callable
     */
    protected $canceller;

    /**
     * @var int
     */
    protected $currentCancellations;

    /**
     * @var int
     */
    protected $requiredCancellations;

    /**
     * @param callable|null $resolver
     * @param callable|null $canceller
     */
    public function __construct(callable $resolver = null, callable $canceller = null)
    {
        $this->result = null;
        $this->handlers = [];
        $this->canceller = function($reason = null) use($canceller) {
            try
            {
                return $canceller !== null && ($result = $canceller($reason)) instanceof self ? $result : $this;
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

        case 'bar':
            $x = 2;
            break;
    }

    // $x is potentially undefined here.
    echo $x;
}
            }
            catch (Error $ex)

            {}
            catch (Exception $ex)

            {}
            return $this;
        };
        $this->currentCancellations = 0;
        $this->requiredCancellations = 0;

        $this->mutate($resolver);
    }

    /**
     *
     */
    public function __destruct()
    {
        unset($this->result);
        unset($this->handlers);
        unset($this->canceller);
        unset($this->currentCancellations);
        unset($this->requiredCancellations);
    }

    /**
     * @override
     * @inheritDoc
     */
    public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
    {
        if (null !== $this->result)
        {
            return $this->getResult()->then($onFulfilled, $onRejected, $onCancel);
        }

        if (null !== $this->canceller)
        {
            $this->requiredCancellations++;

            $canceller = function($reason = null) {
                if (++$this->currentCancellations >= $this->requiredCancellations)
                {
                    return $this->cancel($reason);
                }
                return null;
            };
        }
        else
        {
            $canceller = null;
        }

        return new static(function($resolve, $reject, $cancel) use($onFulfilled, $onRejected, $onCancel) {

            $this->handlers[] = function(PromiseInterface $promise) use($resolve, $reject, $cancel, $onFulfilled, $onRejected, $onCancel) {
                $promise
                    ->then($onFulfilled, $onRejected, $onCancel)
                    ->done($resolve, $reject, $cancel)
                ;
            };
        }, $canceller);
    }

    /**
     * @override
     * @inheritDoc
     */
    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
    {
        if (null !== $this->result)
        {
            $this->getResult()->done($onFulfilled, $onRejected, $onCancel);
        }

        $this->handlers[] = function(PromiseInterface $promise) use($onFulfilled, $onRejected, $onCancel) {
            $promise
                ->done($onFulfilled, $onRejected, $onCancel);
        };
    }

    /**
     * @override
     * @inheritDoc
     */
    public function spread(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
    {
        return $this->then(
            function($values) use($onFulfilled) {
                return $onFulfilled(...((array) $values));
            },
            function($rejections) use($onRejected) {
                return $onRejected(...((array) $rejections));
            },
            function($reasons) use($onCancel) {
                return $onCancel(...((array) $reasons));
            }
        );
    }

    /**
     * @override
     * @inheritDoc
     */
    public function success(callable $onSuccess)
    {
        return $this->then($onSuccess);
    }

    /**
     * @override
     * @inheritDoc
     */
    public function failure(callable $onFailure)
    {
        return $this->then(null, $onFailure);
    }

    /**
     * @override
     * @inheritDoc
     */
    public function abort(callable $onCancel)
    {
        return $this->then(null, null, $onCancel);
    }

    /**
     * @override
     * @inheritDoc
     */
    public function always(callable $onFulfilledOrRejected)
    {
        return $this->then(
            function($value) use($onFulfilledOrRejected) {
                return self::doResolve($onFulfilledOrRejected())->then(function() use($value) {
                    return $value;
                });
            },
            function($reason) use($onFulfilledOrRejected) {
                return self::doResolve($onFulfilledOrRejected())->then(function() use($reason) {
                    return new PromiseRejected($reason);
                });
            },
            function($reason) use($onFulfilledOrRejected) {
                return self::doResolve($onFulfilledOrRejected())->then(function() use($reason) {
                    return new PromiseCancelled($reason);
                });
            }
        );
    }

    /**
     * @override
     * @inheritDoc
     */
    public function isPending()
    {
        return $this->result === null;
    }

    /**
     * @override
     * @inheritDoc
     */
    public function isFulfilled()
    {
        return !$this->isPending() && $this->result->isFulfilled();
    }

    /**
     * @override
     * @inheritDoc
     */
    public function isRejected()
    {
        return !$this->isPending() && $this->result->isRejected();
    }

    /**
     * @override
     * @inheritDoc
     */
    public function isCancelled()
    {
        return !$this->isPending() && $this->result->isCancelled();
    }

    /**
     * @override
     * @inheritDoc
     */
    public function getPromise()
    {
        return $this;
    }

    /**
     * @override
     * @inheritDoc
     */
    public function resolve($value = null)
    {
        if (null !== $this->result || $value === $this)
        {
            return $this->result;
        }

        return $this->settle(self::doResolve($value));
    }

    /**
     * @override
     * @inheritDoc
     */
    public function reject($reason = null)
    {
        if (null !== $this->result || $reason === $this)
        {
            return $this->result;
        }

        return $this->settle(self::doReject($reason));
    }

    /**
     * @override
     * @inheritDoc
     */
    public function cancel($reason = null)
    {
        if (null !== $this->result || $reason === $this)
        {
            return $this->result;
        }

        $target = $this;

        if (null !== $this->canceller)
        {
            $canceller = $this->canceller;
            $this->canceller = null;
            $target = $canceller($reason);
        }

        if ($target === $this)
        {
            return $target->settle(self::doCancel($reason));
        }

        return $target;
    }

    /**
     * Return primitive value associated with Promise.
     *
     * @return mixed|null
     */
    protected function getValue()
    {
        return $this->isFulfilled() ? $this->result->getValue() : null;
    }

    /**
     * Return rejection or cancellation reason for Promise.
     *
     * @return Error|Exception|string|null
     */
    protected function getReason()
    {
        return ($this->isRejected() || $this->isCancelled()) ? $this->result->getReason() : null;
    }

    /**
     * Settle Promise with another Promise.
     *
     * @see PromiseInterface::resolve
     * @see PromiseInterface::reject
     * @see PromiseInterface::cancel
     *
     * @param PromiseInterface $promise
     * @return PromiseInterface
     * @resolves mixed|null
     * @rejects Error|Exception|string|null
     * @cancels Error|Exception|string|null
     */
    protected function settle(PromiseInterface $promise)
    {
        $handlers = $this->handlers;

        $this->result = $promise;
        $this->handlers = [];

        foreach ($handlers as $handler)
        {
            $handler($promise);
        }

        return $promise;
    }

    /**
     * Get Promise result. Returns fulfilled, rejected or cancelled Promise for settled Promises or null for pending.
     *
     * @return PromiseInterface|null
     */
    protected function getResult()
    {
        while ($this->result instanceof Promise && null !== $this->result->result)
        {
            $this->result = $this->result->result;
        }

        return $this->result;
    }

    /**
     * Mutate resolver.
     *
     * @param callable|null $resolver
     */
    protected function mutate(callable $resolver = null)
    {
        if ($resolver === null)
        {
            return;
        }

        try
        {
            $resolver(
                function ($value = null) {
                    $this->resolve($value);
                },
                function ($reason = null) {
                    $this->reject($reason);
                },
                function ($reason = null) {
                    $this->cancel($reason);
                }
            );
        }
        catch (Error $ex)
        {
            $this->reject($ex);
        }
        catch (Exception $ex)
        {
            $this->reject($ex);
        }
    }
}


1		<?php
2
3		namespace Dazzle\Promise;
4
5		use Dazzle\Promise\Partial\PromiseTrait;
6		use Error;
7		use Exception;
8
9		class Promise implements PromiseInterface
10		{
11		use PromiseTrait;
12
13		/**
14		* @var PromiseInterface\|null
15		*/
16		protected $result;
17
18		/**
19		* @var callable[]
20		*/
21		protected $handlers;
22
23		/**
24		* @var callable
25		*/
26		protected $canceller;
27
28		/**
29		* @var int
30		*/
31		protected $currentCancellations;
32
33		/**
34		* @var int
35		*/
36		protected $requiredCancellations;
37
38		/**
39		* @param callable\|null $resolver
40		* @param callable\|null $canceller
41		*/
42	374	public function __construct(callable $resolver = null, callable $canceller = null)
43		{
44	374	$this->result = null;
45	374	$this->handlers = [];
46		$this->canceller = function($reason = null) use($canceller) {
47		try
48		{
49	108	return $canceller !== null && ($result = $canceller($reason)) instanceof self ? $result : $this;
		0 ignored issues – show Bug introduced 2017-06-24 20:50 UTC by Report Bug Copy Issue Report The variable `$result` does not seem to be defined for all execution paths leading up to this point. If you define a variable conditionally, it can happen that it is not defined for all execution paths. Let’s take a look at an example: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } // $x is potentially undefined here. echo $x; } In the above example, the variable `$x` is defined if you pass “foo” or “bar” as argument for `$a`. However, since the `switch` statement has no default case statement, if you pass any other value, the variable `$x` would be undefined. Available Fixes Check for existence of the variable explicitly: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } if (isset($x)) { // Make sure it's always set. echo $x; } } Define a default value for the variable: function myFunction($a) { $x = ''; // Set a default which gets overridden for certain paths. switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } echo $x; } Add a value for the missing path: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; // We add support for the missing case. default: $x = ''; break; } echo $x; } Loading history...
50		}
51		catch (Error $ex)
		0 ignored issues – show Coding Style Comprehensibility introduced 2017-06-24 20:50 UTC by Report Bug Copy Issue Report Consider adding a comment why this CATCH block is empty. Loading history...
52		{}
53		catch (Exception $ex)
		0 ignored issues – show Coding Style Comprehensibility introduced 2017-06-24 20:50 UTC by Report Bug Copy Issue Report Consider adding a comment why this CATCH block is empty. Loading history...
54		{}
55		return $this;
56		};
57	374	$this->currentCancellations = 0;
58	374	$this->requiredCancellations = 0;
59
60	374	$this->mutate($resolver);
61	374	}
62
63		/**
64		*
65		*/
66	103	public function __destruct()
67		{
68	103	unset($this->result);
69	103	unset($this->handlers);
70	103	unset($this->canceller);
71	103	unset($this->currentCancellations);
72	103	unset($this->requiredCancellations);
73	103	}
74
75		/**
76		* @override
77		* @inheritDoc
78		*/
79	222	public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
80		{
81	222	if (null !== $this->result)
82		{
83	130	return $this->getResult()->then($onFulfilled, $onRejected, $onCancel);
84		}
85
86	96	if (null !== $this->canceller)
87		{
88	96	$this->requiredCancellations++;
89
90		$canceller = function($reason = null) {
91	39	if (++$this->currentCancellations >= $this->requiredCancellations)
92		{
93	35	return $this->cancel($reason);
94		}
95	12	return null;
96	96	};
97		}
98		else
99		{
100		$canceller = null;
101		}
102
103		return new static(function($resolve, $reject, $cancel) use($onFulfilled, $onRejected, $onCancel) {
104
105		$this->handlers[] = function(PromiseInterface $promise) use($resolve, $reject, $cancel, $onFulfilled, $onRejected, $onCancel) {
106		$promise
107	86	->then($onFulfilled, $onRejected, $onCancel)
108	86	->done($resolve, $reject, $cancel)
109		;
110	84	};
111	96	}, $canceller);
112		}
113
114		/**
115		* @override
116		* @inheritDoc
117		*/
118	80	public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
119		{
120	80	if (null !== $this->result)
121		{
122	39	$this->getResult()->done($onFulfilled, $onRejected, $onCancel);
123		}
124
125		$this->handlers[] = function(PromiseInterface $promise) use($onFulfilled, $onRejected, $onCancel) {
126		$promise
127	37	->done($onFulfilled, $onRejected, $onCancel);
128	17	};
129	54	}
130
131		/**
132		* @override
133		* @inheritDoc
134		*/
135	18	public function spread(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
136		{
137	18	return $this->then(
138		function($values) use($onFulfilled) {
139	6	return $onFulfilled(...((array) $values));
140	18	},
141		function($rejections) use($onRejected) {
142	6	return $onRejected(...((array) $rejections));
143	18	},
144		function($reasons) use($onCancel) {
145	6	return $onCancel(...((array) $reasons));
146	18	}
147		);
148		}
149
150		/**
151		* @override
152		* @inheritDoc
153		*/
154	8	public function success(callable $onSuccess)
155		{
156	8	return $this->then($onSuccess);
157		}
158
159		/**
160		* @override
161		* @inheritDoc
162		*/
163	10	public function failure(callable $onFailure)
164		{
165	10	return $this->then(null, $onFailure);
166		}
167
168		/**
169		* @override
170		* @inheritDoc
171		*/
172	8	public function abort(callable $onCancel)
173		{
174	8	return $this->then(null, null, $onCancel);
175		}
176
177		/**
178		* @override
179		* @inheritDoc
180		*/
181	58	public function always(callable $onFulfilledOrRejected)
182		{
183	58	return $this->then(
184		function($value) use($onFulfilledOrRejected) {
185		return self::doResolve($onFulfilledOrRejected())->then(function() use($value) {
186	12	return $value;
187	16	});
188	58	},
189		function($reason) use($onFulfilledOrRejected) {
190		return self::doResolve($onFulfilledOrRejected())->then(function() use($reason) {
191	12	return new PromiseRejected($reason);
192	16	});
193	58	},
194		function($reason) use($onFulfilledOrRejected) {
195		return self::doResolve($onFulfilledOrRejected())->then(function() use($reason) {
196	12	return new PromiseCancelled($reason);
197	14	});
198	58	}
199		);
200		}
201
202		/**
203		* @override
204		* @inheritDoc
205		*/
206	34	public function isPending()
207		{
208	34	return $this->result === null;
209		}
210
211		/**
212		* @override
213		* @inheritDoc
214		*/
215	8	public function isFulfilled()
216		{
217	8	return !$this->isPending() && $this->result->isFulfilled();
218		}
219
220		/**
221		* @override
222		* @inheritDoc
223		*/
224	8	public function isRejected()
225		{
226	8	return !$this->isPending() && $this->result->isRejected();
227		}
228
229		/**
230		* @override
231		* @inheritDoc
232		*/
233	10	public function isCancelled()
234		{
235	10	return !$this->isPending() && $this->result->isCancelled();
236		}
237
238		/**
239		* @override
240		* @inheritDoc
241		*/
242		public function getPromise()
243		{
244		return $this;
245		}
246
247		/**
248		* @override
249		* @inheritDoc
250		*/
251	144	public function resolve($value = null)
252		{
253	144	if (null !== $this->result \|\| $value === $this)
254		{
255	10	return $this->result;
256		}
257
258	142	return $this->settle(self::doResolve($value));
259		}
260
261		/**
262		* @override
263		* @inheritDoc
264		*/
265	114	public function reject($reason = null)
266		{
267	114	if (null !== $this->result \|\| $reason === $this)
268		{
269	6	return $this->result;
270		}
271
272	112	return $this->settle(self::doReject($reason));
273		}
274
275		/**
276		* @override
277		* @inheritDoc
278		*/
279	121	public function cancel($reason = null)
280		{
281	121	if (null !== $this->result \|\| $reason === $this)
282		{
283	50	return $this->result;
284		}
285
286	108	$target = $this;
287
288	108	if (null !== $this->canceller)
289		{
290	108	$canceller = $this->canceller;
291	108	$this->canceller = null;
292	108	$target = $canceller($reason);
293		}
294
295	108	if ($target === $this)
296		{
297	108	return $target->settle(self::doCancel($reason));
298		}
299
300		return $target;
301		}
302
303		/**
304		* Return primitive value associated with Promise.
305		*
306		* @return mixed\|null
307		*/
308		protected function getValue()
309		{
310		return $this->isFulfilled() ? $this->result->getValue() : null;
311		}
312
313		/**
314		* Return rejection or cancellation reason for Promise.
315		*
316		* @return Error\|Exception\|string\|null
317		*/
318		protected function getReason()
319		{
320		return ($this->isRejected() \|\| $this->isCancelled()) ? $this->result->getReason() : null;
321		}
322
323		/**
324		* Settle Promise with another Promise.
325		*
326		* @see PromiseInterface::resolve
327		* @see PromiseInterface::reject
328		* @see PromiseInterface::cancel
329		*
330		* @param PromiseInterface $promise
331		* @return PromiseInterface
332		* @resolves mixed\|null
333		* @rejects Error\|Exception\|string\|null
334		* @cancels Error\|Exception\|string\|null
335		*/
336	330	protected function settle(PromiseInterface $promise)
337		{
338	330	$handlers = $this->handlers;
339
340	330	$this->result = $promise;
341	330	$this->handlers = [];
342
343	330	foreach ($handlers as $handler)
344		{
345	114	$handler($promise);
346		}
347
348	312	return $promise;
349		}
350
351		/**
352		* Get Promise result. Returns fulfilled, rejected or cancelled Promise for settled Promises or null for pending.
353		*
354		* @return PromiseInterface\|null
355		*/
356	168	protected function getResult()
357		{
358	168	while ($this->result instanceof Promise && null !== $this->result->result)
359		{
360	1	$this->result = $this->result->result;
361		}
362
363	168	return $this->result;
364		}
365
366		/**
367		* Mutate resolver.
368		*
369		* @param callable\|null $resolver
370		*/
371	374	protected function mutate(callable $resolver = null)
372		{
373	374	if ($resolver === null)
374		{
375	24	return;
376		}
377
378		try
379		{
380	350	$resolver(
381		function ($value = null) {
382	140	$this->resolve($value);
383	350	},
384		function ($reason = null) {
385	106	$this->reject($reason);
386	350	},
387	350	function ($reason = null) {
388	98	$this->cancel($reason);
389	350	}
390		);
391		}
392	4	catch (Error $ex)
393		{
394		$this->reject($ex);
395		}
396	4	catch (Exception $ex)
397		{
398	4	$this->reject($ex);
399		}
400	350	}
401		}
402

dazzle-php / promise

Promise::__construct() B last analyzed 2017-07-23 19:08 UTC

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Promise::__construct() B
last analyzed 2017-07-23 19:08 UTC