Sequence::groupBy() - Code Metrics - Inspection of "fix bug when substring with negative length on emp..." - Innmind/Immutable - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — develop ( 3fba13...ab97fd )

by Baptiste

created 2017-07-23 08:30 UTC

Sequence::groupBy() B

↳ Parent: Sequence

Complexity

Conditions	5
Paths	6

Size

Total Lines	30
Code Lines	17

Duplication

Lines	30
Ratio	100 %

Code Coverage

Tests	16
CRAP Score	5

Importance

Changes

Metric	Value
dl	30
loc	30
ccs	16
cts	16
cp	1
rs	8.439
c	0
b	0
f	0
cc	5
eloc	17
nc	6
nop	1
crap	5

<?php
declare(strict_types = 1);

namespace Innmind\Immutable;

use Innmind\Immutable\{
    Exception\OutOfBoundException,
    Exception\LogicException,
    Exception\ElementNotFoundException,
    Exception\GroupEmptySequenceException
};

/**
 * A defined set of ordered elements
 */
class Sequence implements SequenceInterface
{
    use Type;

    private $values;
    private $size;

    public function __construct(...$values)
    {
        $this->values = $values;
        $this->size = count($values);
    }

    /**
     * {@inheritdoc}
     */
    public function size(): int
    {
        return $this->size;
    }

    /**
     * {@inheritdoc}
     */
    public function count(): int
    {
        return $this->size();
    }

    /**
     * {@inheritdoc}
     */
    public function current()
    {
        return current($this->values);
    }

    /**
     * {@inheritdoc}
     */
    public function key()
    {
        return key($this->values);
    }

    /**
     * {@inheritdoc}
     */
    public function next()
    {
        next($this->values);
    }

    /**
     * {@inheritdoc}
     */
    public function rewind()
    {
        reset($this->values);
    }

    /**
     * {@inheritdoc}
     */
    public function valid(): bool
    {
        return $this->key() !== null;
    }

    /**
     * {@inheritdoc}
     */
    public function offsetExists($offset): bool
    {
        return $this->has($offset);
    }

    /**
     * {@inheritdoc}
     */
    public function offsetGet($offset)
    {
        return $this->get($offset);
    }

    /**
     * {@inheritdoc}
     */
    public function offsetSet($offset, $value)
    {
        throw new LogicException('You can\'t modify a sequence');
    }

    /**
     * {@inheritdoc}
     */
    public function offsetUnset($offset)
    {
        throw new LogicException('You can\'t modify a sequence');
    }

    /**
     * {@inheritdoc}
     */
    public function toPrimitive()
    {
        return $this->values;
    }

    /**
     * {@inheritdoc}
     */
    public function get(int $index)
    {
        if (!$this->has($index)) {
            throw new OutOfBoundException;
        }

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

    /**
     * {@inheritdoc}
     */
    public function has(int $index): bool
    {
        return array_key_exists($index, $this->values);
    }

    /**
     * {@inheritdoc}
     */
    public function diff(SequenceInterface $seq): SequenceInterface
    {
        return new self(
            ...array_diff(
                $this->values,
                $seq->toPrimitive()
            )
        );
    }

    /**
     * {@inheritdoc}
     */
    public function distinct(): SequenceInterface
    {
        return new self(...array_unique($this->values));
    }

    /**
     * {@inheritdoc}
     */
    public function drop(int $size): SequenceInterface
    {
        return new self(...array_slice($this->values, $size));
    }

    /**
     * {@inheritdoc}
     */
    public function dropEnd(int $size): SequenceInterface
    {
        return new self(...array_slice($this->values, 0, $this->size() - $size));
    }

    /**
     * {@inheritdoc}
     */
    public function equals(SequenceInterface $seq): bool
    {
        return $this->values === $seq->toPrimitive();
    }

    /**
     * {@inheritdoc}
     */
    public function filter(callable $predicate): SequenceInterface
    {
        return new self(...array_filter(
            $this->values,
            $predicate
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function foreach(callable $function): SequenceInterface
    {
        foreach ($this->values as $value) {
            $function($value);
        }

        return $this;
class Author {
    private $name;

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

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    /**
     * {@inheritdoc}
     */
    public function groupBy(callable $discriminator): MapInterface
    {
        if ($this->size() === 0) {
            throw new GroupEmptySequenceException;
        }

        $map = null;

        foreach ($this->values as $value) {
            $key = $discriminator($value);

            if ($map === null) {
                $map = new Map(
                    $this->determineType($key),
                    SequenceInterface::class
                );
            }

            if ($map->contains($key)) {
                $map = $map->put(
                    $key,
                    $map->get($key)->add($value)
                );
            } else {
                $map = $map->put($key, new self($value));
            }
        }

        return $map;
    }

    /**
     * {@inheritdoc}
     */
    public function first()
    {
        if ($this->size() === 0) {
            throw new OutOfBoundException;
        }

        return $this->values[0];
    }

    /**
     * {@inheritdoc}
     */
    public function last()
    {
        if ($this->size() === 0) {
            throw new OutOfBoundException;
        }

        return $this->values[$this->size() - 1];
    }

    /**
     * {@inheritdoc}
     */
    public function contains($element): bool
    {
        return in_array($element, $this->values, true);
    }

    /**
     * {@inheritdoc}
     */
    public function indexOf($element): int
    {
        $index = array_search($element, $this->values, true);

        if ($index === false) {
            throw new ElementNotFoundException;
        }

        return $index;
    }

    /**
     * {@inheritdoc}
     */
    public function indices(): StreamInterface
    {
        $indices = new Stream('int');

        foreach ($this->values as $index => $value) {
            $indices = $indices->add($index);
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
        }

        return $indices;
    }

    /**
     * {@inheritdoc}
     */
    public function map(callable $function): SequenceInterface
    {
        return new self(...array_map($function, $this->values));
    }

    /**
     * {@inheritdoc}
     */
    public function pad(int $size, $element): SequenceInterface
    {
        return new self(...array_pad($this->values, $size, $element));
    }

    /**
     * {@inheritdoc}
     */
    public function partition(callable $predicate): MapInterface
    {
        $truthy = [];
        $falsy = [];

        foreach ($this->values as $value) {
            if ($predicate($value) === true) {
                $truthy[] = $value;
            } else {
                $falsy[] = $value;
            }
        }

        return (new Map('bool', SequenceInterface::class))
            ->put(true, new self(...$truthy))
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            ->put(false, new self(...$falsy));
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
    }

    /**
     * {@inheritdoc}
     */
    public function slice(int $from, int $until): SequenceInterface
    {
        return new self(...array_slice(
            $this->values,
            $from,
            $until - $from
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function splitAt(int $index): StreamInterface
    {
        return (new Stream(SequenceInterface::class))
            ->add($this->slice(0, $index))
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            ->add($this->slice($index, $this->size()));
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
    }

    /**
     * {@inheritdoc}
     */
    public function take(int $size): SequenceInterface
    {
        return $this->slice(0, $size);
    }

    /**
     * {@inheritdoc}
     */
    public function takeEnd(int $size): SequenceInterface
    {
        return $this->slice($this->size() - $size, $this->size());
    }

    /**
     * {@inheritdoc}
     */
    public function append(SequenceInterface $seq): SequenceInterface
    {
        return new self(...$this->values, ...$seq->toPrimitive());
    }

    /**
     * {@inheritdoc}
     */
    public function intersect(SequenceInterface $seq): SequenceInterface
    {
        return new self(...array_intersect($this->values, $seq->toPrimitive()));
    }

    /**
     * {@inheritdoc}
     */
    public function join(string $separator): Str
    {
        return new Str(implode($separator, $this->values));
    }

    /**
     * {@inheritdoc}
     */
    public function add($element): SequenceInterface
    {
        $values = $this->values;
        $values[] = $element;

        return new self(...$values);
    }

    /**
     * {@inheritdoc}
     */
    public function sort(callable $function): SequenceInterface
    {
        $values = $this->values;
        usort($values, $function);

        return new self(...$values);
    }

    /**
     * {@inheritdoc}
     */
    public function reduce($carry, callable $reducer)
    {
        return array_reduce($this->values, $reducer, $carry);
    }

    /**
     * {@inheritdoc}
     */
    public function reverse(): SequenceInterface
    {
        return new self(...array_reverse($this->values));
    }
}


1			<?php
2			declare(strict_types = 1);
3
4			namespace Innmind\Immutable;
5
6			use Innmind\Immutable\{
7			Exception\OutOfBoundException,
8			Exception\LogicException,
9			Exception\ElementNotFoundException,
10			Exception\GroupEmptySequenceException
11			};
12
13			/**
14			* A defined set of ordered elements
15			*/
16			class Sequence implements SequenceInterface
17			{
18			use Type;
19
20			private $values;
21			private $size;
22
23	300		public function __construct(...$values)
24			{
25	300		$this->values = $values;
26	300		$this->size = count($values);
27	300		}
28
29			/**
30			* {@inheritdoc}
31			*/
32	66		public function size(): int
33			{
34	66		return $this->size;
35			}
36
37			/**
38			* {@inheritdoc}
39			*/
40	2		public function count(): int
41			{
42	2		return $this->size();
43			}
44
45			/**
46			* {@inheritdoc}
47			*/
48	68		public function current()
49			{
50	68		return current($this->values);
51			}
52
53			/**
54			* {@inheritdoc}
55			*/
56	72		public function key()
57			{
58	72		return key($this->values);
59			}
60
61			/**
62			* {@inheritdoc}
63			*/
64	68		public function next()
65			{
66	68		next($this->values);
67	68		}
68
69			/**
70			* {@inheritdoc}
71			*/
72	68		public function rewind()
73			{
74	68		reset($this->values);
75	68		}
76
77			/**
78			* {@inheritdoc}
79			*/
80	68		public function valid(): bool
81			{
82	68		return $this->key() !== null;
83			}
84
85			/**
86			* {@inheritdoc}
87			*/
88	2		public function offsetExists($offset): bool
89			{
90	2		return $this->has($offset);
91			}
92
93			/**
94			* {@inheritdoc}
95			*/
96	2		public function offsetGet($offset)
97			{
98	2		return $this->get($offset);
99			}
100
101			/**
102			* {@inheritdoc}
103			*/
104	2		public function offsetSet($offset, $value)
105			{
106	2		throw new LogicException('You can\'t modify a sequence');
107			}
108
109			/**
110			* {@inheritdoc}
111			*/
112	2		public function offsetUnset($offset)
113			{
114	2		throw new LogicException('You can\'t modify a sequence');
115			}
116
117			/**
118			* {@inheritdoc}
119			*/
120	136		public function toPrimitive()
121			{
122	136		return $this->values;
123			}
124
125			/**
126			* {@inheritdoc}
127			*/
128	50		public function get(int $index)
129			{
130	50		if (!$this->has($index)) {
131	6		throw new OutOfBoundException;
132			}
133
134	44		return $this->values[$index];
135			}
136
137			/**
138			* {@inheritdoc}
139			*/
140	54		public function has(int $index): bool
141			{
142	54		return array_key_exists($index, $this->values);
143			}
144
145			/**
146			* {@inheritdoc}
147			*/
148	6		public function diff(SequenceInterface $seq): SequenceInterface
149			{
150	6		return new self(
151	6		...array_diff(
152	6		$this->values,
153	6		$seq->toPrimitive()
154			)
155			);
156			}
157
158			/**
159			* {@inheritdoc}
160			*/
161	4		public function distinct(): SequenceInterface
162			{
163	4		return new self(...array_unique($this->values));
164			}
165
166			/**
167			* {@inheritdoc}
168			*/
169	18		public function drop(int $size): SequenceInterface
170			{
171	18		return new self(...array_slice($this->values, $size));
172			}
173
174			/**
175			* {@inheritdoc}
176			*/
177	4		public function dropEnd(int $size): SequenceInterface
178			{
179	4		return new self(...array_slice($this->values, 0, $this->size() - $size));
180			}
181
182			/**
183			* {@inheritdoc}
184			*/
185	16		public function equals(SequenceInterface $seq): bool
186			{
187	16		return $this->values === $seq->toPrimitive();
188			}
189
190			/**
191			* {@inheritdoc}
192			*/
193	6		public function filter(callable $predicate): SequenceInterface
194			{
195	6		return new self(...array_filter(
196	6		$this->values,
197	6		$predicate
198			));
199			}
200
201			/**
202			* {@inheritdoc}
203			*/
204	6		public function foreach(callable $function): SequenceInterface
205			{
206	6		foreach ($this->values as $value) {
207	6		$function($value);
208			}
209
210	6		return $this;
			1 ignored issue – show Bug Best Practice introduced 2017-02-04 17:24 UTC by Report Bug Copy Issue Report The return type of `return $this;` (`Innmind\Immutable\Sequence`) is incompatible with the return type declared by the interface `Innmind\Immutable\SequenceInterface::foreach` of type `self`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
211			}
212
213			/**
214			* {@inheritdoc}
215			*/
216	4	View Code Duplication	public function groupBy(callable $discriminator): MapInterface
217			{
218	4		if ($this->size() === 0) {
219	2		throw new GroupEmptySequenceException;
220			}
221
222	2		$map = null;
223
224	2		foreach ($this->values as $value) {
225	2		$key = $discriminator($value);
226
227	2		if ($map === null) {
228	2		$map = new Map(
229	2		$this->determineType($key),
230	2		SequenceInterface::class
231			);
232			}
233
234	2		if ($map->contains($key)) {
235	2		$map = $map->put(
236	2		$key,
237	2		$map->get($key)->add($value)
238			);
239			} else {
240	2		$map = $map->put($key, new self($value));
241			}
242			}
243
244	2		return $map;
245			}
246
247			/**
248			* {@inheritdoc}
249			*/
250	8		public function first()
251			{
252	8		if ($this->size() === 0) {
253	2		throw new OutOfBoundException;
254			}
255
256	6		return $this->values[0];
257			}
258
259			/**
260			* {@inheritdoc}
261			*/
262	8		public function last()
263			{
264	8		if ($this->size() === 0) {
265	2		throw new OutOfBoundException;
266			}
267
268	6		return $this->values[$this->size() - 1];
269			}
270
271			/**
272			* {@inheritdoc}
273			*/
274	100		public function contains($element): bool
275			{
276	100		return in_array($element, $this->values, true);
277			}
278
279			/**
280			* {@inheritdoc}
281			*/
282	42		public function indexOf($element): int
283			{
284	42		$index = array_search($element, $this->values, true);
285
286	42		if ($index === false) {
287	2		throw new ElementNotFoundException;
288			}
289
290	40		return $index;
291			}
292
293			/**
294			* {@inheritdoc}
295			*/
296	4		public function indices(): StreamInterface
297			{
298	4		$indices = new Stream('int');
299
300	4		foreach ($this->values as $index => $value) {
301	4		$indices = $indices->add($index);
			1 ignored issue – show Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `$index` is of type `integer`, but the function expects a `object<Innmind\Immutable\T>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
302			}
303
304	4		return $indices;
305			}
306
307			/**
308			* {@inheritdoc}
309			*/
310	2		public function map(callable $function): SequenceInterface
311			{
312	2		return new self(...array_map($function, $this->values));
313			}
314
315			/**
316			* {@inheritdoc}
317			*/
318	4		public function pad(int $size, $element): SequenceInterface
319			{
320	4		return new self(...array_pad($this->values, $size, $element));
321			}
322
323			/**
324			* {@inheritdoc}
325			*/
326	2		public function partition(callable $predicate): MapInterface
327			{
328	2		$truthy = [];
329	2		$falsy = [];
330
331	2		foreach ($this->values as $value) {
332	2		if ($predicate($value) === true) {
333	2		$truthy[] = $value;
334			} else {
335	2		$falsy[] = $value;
336			}
337			}
338
339	2		return (new Map('bool', SequenceInterface::class))
340	2		->put(true, new self(...$truthy))
			2 ignored issues – show Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `true` is of type `boolean`, but the function expects a `object<Innmind\Immutable\T>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history... Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `new self(...$truthy)` is of type `object<Innmind\Immutable\Sequence>`, but the function expects a `object<Innmind\Immutable\S>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
341	2		->put(false, new self(...$falsy));
			2 ignored issues – show Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `false` is of type `boolean`, but the function expects a `object<Innmind\Immutable\T>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history... Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `new self(...$falsy)` is of type `object<Innmind\Immutable\Sequence>`, but the function expects a `object<Innmind\Immutable\S>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
342			}
343
344			/**
345			* {@inheritdoc}
346			*/
347	34		public function slice(int $from, int $until): SequenceInterface
348			{
349	34		return new self(...array_slice(
350	34		$this->values,
351	34		$from,
352	34		$until - $from
353			));
354			}
355
356			/**
357			* {@inheritdoc}
358			*/
359	4		public function splitAt(int $index): StreamInterface
360			{
361	4		return (new Stream(SequenceInterface::class))
362	4		->add($this->slice(0, $index))
			1 ignored issue – show Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `$this->slice(0, $index)` is of type `object<Innmind\Immutable\Sequence>`, but the function expects a `object<Innmind\Immutable\T>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
363	4		->add($this->slice($index, $this->size()));
			1 ignored issue – show Documentation introduced 2017-02-12 11:09 UTC by Report Bug Copy Issue Report `$this->slice($index, $this->size())` is of type `object<Innmind\Immutable\Sequence>`, but the function expects a `object<Innmind\Immutable\T>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
364			}
365
366			/**
367			* {@inheritdoc}
368			*/
369	18		public function take(int $size): SequenceInterface
370			{
371	18		return $this->slice(0, $size);
372			}
373
374			/**
375			* {@inheritdoc}
376			*/
377	4		public function takeEnd(int $size): SequenceInterface
378			{
379	4		return $this->slice($this->size() - $size, $this->size());
380			}
381
382			/**
383			* {@inheritdoc}
384			*/
385	22		public function append(SequenceInterface $seq): SequenceInterface
386			{
387	22		return new self(...$this->values, ...$seq->toPrimitive());
388			}
389
390			/**
391			* {@inheritdoc}
392			*/
393	6		public function intersect(SequenceInterface $seq): SequenceInterface
394			{
395	6		return new self(...array_intersect($this->values, $seq->toPrimitive()));
396			}
397
398			/**
399			* {@inheritdoc}
400			*/
401	10		public function join(string $separator): Str
402			{
403	10		return new Str(implode($separator, $this->values));
404			}
405
406			/**
407			* {@inheritdoc}
408			*/
409	176		public function add($element): SequenceInterface
410			{
411	176		$values = $this->values;
412	176		$values[] = $element;
413
414	176		return new self(...$values);
415			}
416
417			/**
418			* {@inheritdoc}
419			*/
420	6		public function sort(callable $function): SequenceInterface
421			{
422	6		$values = $this->values;
423	6		usort($values, $function);
424
425	6		return new self(...$values);
426			}
427
428			/**
429			* {@inheritdoc}
430			*/
431	44		public function reduce($carry, callable $reducer)
432			{
433	44		return array_reduce($this->values, $reducer, $carry);
434			}
435
436			/**
437			* {@inheritdoc}
438			*/
439	4		public function reverse(): SequenceInterface
440			{
441	4		return new self(...array_reverse($this->values));
442			}
443			}
444

Innmind / Immutable

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