Set::diff() - Code Metrics - Inspection of "Refactor Sequence::rotate, Set::xor" - php-ds/polyfill - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 7482d8...b6686e )

by Rudi

created 2016-03-04 22:15 UTC

Set::diff() A

↳ Parent: Set

Complexity

Conditions	3
Paths	3

Size

Total Lines	14
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Metric	Value
dl	0
loc	14
rs	9.4285
cc	3
eloc	7
nc	3
nop	1

<?php
namespace Ds;

use Error;
use OutOfBoundsException;
use OutOfRangeException;
use Traversable;

/**
 * Set
 *
 * @package Ds
 */
final class Set implements \IteratorAggregate, \ArrayAccess, Collection
{
    use Traits\Collection;

    const MIN_CAPACITY = Map::MIN_CAPACITY;

    /**
     * @var Map
     */
    private $internal;

    /**
     * Creates a new set using the values of an array or Traversable object.
     * The keys of either will not be preserved.
     *
     *
     * Should an integer be provided the Set will allocate the memory capacity
     * to the size of $values.
     *
     * @param array|\Traversable|int|null $values
     */
    public function __construct($values = null)

    {
        $this->internal = new Map();

        if (is_array($values) || $values instanceof Traversable) {
            $this->addAll($values);
        } elseif (is_integer($values)) {
            $this->allocate($values);
        }
    }

    /**
     * Adds zero or more values to the set.
     *
     * @param mixed ...$values
     */

    public function add(...$values)
    {
        foreach ($values as $value) {
            $this->internal[$value] = null;
        }
    }

    /**
     * Adds all values in an array or iterable object to the set.
     *
     * @param array|\Traversable $values
     */
    public function addAll($values)
    {
        if ($values) {
            foreach ($values as $value) {
                $this->internal[$value] = null;
            }
        }
    }

    /**
     * Ensures that enough memory is allocated for a specified capacity. This
     * potentially reduces the number of reallocations as the size increases.
     *
     * @param int $capacity The number of values for which capacity should be
     *                      allocated. Capacity will stay the same if this value
     *                      is less than or equal to the current capacity.
     */
    public function allocate(int $capacity)
    {
        $this->internal->allocate($capacity);
    }

    /**
     * Returns the current capacity of the set.
     *
     * @return int
     */
    public function capacity(): int
    {
        return $this->internal->capacity();
    }

    /**
     * Clear all elements in the Set
     */
    public function clear()
    {
        $this->internal->clear();
    }

    /**
     * Determines whether the set contains all of zero or more values.
     *
     * @param mixed ...$values
     *
     * @return bool true if at least one value was provided and the set
     *              contains all given values, false otherwise.
     */

    public function contains(...$values): bool

    {
        if ( ! $values) {

            return false;
        }

        foreach ($values as $value) {
            if ( ! $this->internal->containsKey($value)) {
                return false;
            }
        }

        return true;
    }

    /**
     * @inheritDoc
     */
    public function copy()
    {
        return new Set($this);
    }

    /**
     * Returns the number of elements in the Stack
     *
     * @return int
     */
    public function count(): int
    {
        return count($this->internal);
    }

    /**
     * Creates a new set using values from this set that aren't in another set.
     *
     * Formally: A \ B = {x ∈ A | x ∉ B}
     *
     * @param Set $set
     *
     * @return Set
     */
    public function diff(Set $set): Set
    {
        $diff = new Set();

        foreach ($this as $value) {
            if ($set->contains($value)) {
                continue;
            }

            $diff->add($value);
        }

        return $diff;
    }

    /**
     * Creates a new set using values in either this set or in another set,
     * but not in both.
     *
     * Formally: A ⊖ B = {x : x ∈ (A \ B) ∪ (B \ A)}
     *
     * @param Set $set
     *
     * @return Set
     */
    public function xor(Set $set): Set
    {
        return $this->internal->xor($set->internal)->keys();
    }

    /**
     * Returns a new set containing only the values for which a predicate
     * returns true. A boolean test will be used if a predicate is not provided.
     *
     * @param callable|null $predicate Accepts a value, returns a boolean:
     *                                 true : include the value,
     *                                 false: skip the value.
     *
     * @return Set
     */
    public function filter(callable $predicate = null): Set

    {
        $filtered = new Set();

        foreach ($this as $value) {
            if ($predicate ? $predicate($value) : $value) {
                $filtered->add($value);
            }
        }

        return $filtered;
    }

    /**
     * Returns the first value in the set.
     *
     * @return mixed the first value in the set.
     */
    public function first()
    {
        return $this->internal->first()->key;
    }

    /**
     * Returns the value at a specified position in the set.
     *
     * @param int $position
     *
     * @return mixed|null
     *
     * @throws OutOfRangeException
     */
    public function get(int $position)
    {
        return $this->internal->skip($position)->key;
    }

    /**
     * Creates a new set using values common to both this set and another set.
     * In other words, returns a copy of this set with all values removed that
     * aren't in the other set.
     *
     * Formally: A ∩ B = {x : x ∈ A ∧ x ∈ B}
     *
     * @param Set $set
     *
     * @return Set
     */
    public function intersect(Set $set): Set
    {
        return $this->internal->intersect($set->internal)->keys();
    }

    /**
     * @inheritDoc
     */
    public function isEmpty(): bool
    {
        return $this->internal->isEmpty();
    }

    /**
     * Joins all values of the set into a string, adding an optional 'glue'
     * between them. Returns an empty string if the set is empty.
     *
     * @param string $glue

     *
     * @return string
     */
    public function join(string $glue = null): string
    {
        return implode($glue, $this->toArray());
    }

    /**
     * Returns the last value in the set.
     *
     * @return mixed the last value in the set.
     */
    public function last()
    {
        return $this->internal->last()->key;
    }

    /**
     * Iteratively reduces the set to a single value using a callback.
     *
     * @param callable $callback Accepts the carry and current value, and
     *                           returns an updated carry value.
     *
     * @param mixed|null $initial Optional initial carry value.
     *
     * @return mixed The carry value of the final iteration, or the initial
     *               value if the set was empty.
     */
    public function reduce(callable $callback, $initial = null)
    {
        $carry = $initial;

        foreach ($this as $value) {
            $carry = $callback($carry, $value);
        }

        return $carry;
    }

    /**
     * Removes zero or more values from the set.
     *
     * @param mixed ...$values
     */

    public function remove(...$values)
    {
        foreach ($values as $value) {
            $this->internal->remove($value, null);
        }
    }

    /**
     * Returns a reversed copy of the set.
     *
     * @return Set
     */
    public function reverse(): Set
    {
        $reversed = new Set();
$a = "a";
$ab = "ab";
$abc = "abc";
        $reversed->internal = $this->internal->reverse();

        return $reversed;
    }

    /**
     * Returns a subset of a given length starting at a specified offset.
     *
     * @param int $offset If the offset is non-negative, the set will start
     *                    at that offset in the set. If offset is negative,
     *                    the set will start that far from the end.
     *
     * @param int $length If a length is given and is positive, the resulting

     *                    set will have up to that many values in it.
     *                    If the requested length results in an overflow, only
     *                    values up to the end of the set will be included.
     *
     *                    If a length is given and is negative, the set
     *                    will stop that many values from the end.
     *
     *                    If a length is not provided, the resulting set
     *                    will contains all values between the offset and the
     *                    end of the set.
     *
     * @return Set
     */
    public function slice(int $offset, int $length = null): Set
    {
        $sliced = new Set();
$a = "a";
$ab = "ab";
$abc = "abc";
        $sliced->internal = $this->internal->slice($offset, $length);

        return $sliced;
    }

    /**
     * Returns a sorted copy of the set, based on an optional callable
     * comparator. Natural ordering will be used if a comparator is not given.
     *
     * @param callable|null $comparator Accepts two values to be compared.
     *                                  Should return the result of a <=> b.
     *
     * @return Set
     */
    public function sort(callable $comparator = null): Set
    {
        $set = new Set();
$a = "a";
$ab = "ab";
$abc = "abc";
        $set->internal = $this->internal->sort($comparator);

        return $set;
    }

    /**
     * @inheritDoc
     */
    public function toArray(): array
    {
        return iterator_to_array($this);
    }

    /**
     * Creates a new set that contains the values of this set as well as the
     * values of another set.
     *
     * Formally: A ∪ B = {x: x ∈ A ∨ x ∈ B}
     *
     * @param Set $set
     *
     * @return Set
     */
    public function union(Set $set): Set
    {
        $union = new Set();

        foreach ($this as $value) {
            $union->add($value);
        }

        foreach ($set as $value) {
            $union->add($value);
        }

        return $union;
    }

    /**
     * Get iterator
     */
    public function getIterator()
    {
        foreach ($this->internal as $key => $value) {
            yield $key;
        }
    }

    /**
     * @inheritdoc
     *
     * @throws OutOfBoundsException
     */
    public function offsetSet($offset, $value)
    {
        if ($offset === null) {
            $this->add($value);
            return;
        }

        throw new OutOfBoundsException();
    }

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

    /**
     * @inheritdoc
     *
     * @throws Error
     */
    public function offsetExists($offset)
    {
        throw new Error();
    }

    /**
     * @inheritdoc
     *
     * @throws Error
     */
    public function offsetUnset($offset)
    {
        throw new Error();
    }
}


1		<?php
2		namespace Ds;
3
4		use Error;
5		use OutOfBoundsException;
6		use OutOfRangeException;
7		use Traversable;
8
9		/**
10		* Set
11		*
12		* @package Ds
13		*/
14		final class Set implements \IteratorAggregate, \ArrayAccess, Collection
15		{
16		use Traits\Collection;
17
18		const MIN_CAPACITY = Map::MIN_CAPACITY;
19
20		/**
21		* @var Map
22		*/
23		private $internal;
24
25		/**
26		* Creates a new set using the values of an array or Traversable object.
27		* The keys of either will not be preserved.
28		*
29		*
30		* Should an integer be provided the Set will allocate the memory capacity
31		* to the size of $values.
32		*
33		* @param array\|\Traversable\|int\|null $values
34		*/
35	View Code Duplication	public function __construct($values = null)
		0 ignored issues – show Duplication introduced 2016-03-03 20:54 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
36		{
37		$this->internal = new Map();
38
39		if (is_array($values) \|\| $values instanceof Traversable) {
40		$this->addAll($values);
41		} elseif (is_integer($values)) {
42		$this->allocate($values);
43		}
44		}
45
46		/**
47		* Adds zero or more values to the set.
48		*
49		* @param mixed ...$values
50		*/
		0 ignored issues – show Documentation introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Consider making the type for parameter `$values` a bit more specific; maybe use `array`. Loading history...
51		public function add(...$values)
52		{
53		foreach ($values as $value) {
54		$this->internal[$value] = null;
55		}
56		}
57
58		/**
59		* Adds all values in an array or iterable object to the set.
60		*
61		* @param array\|\Traversable $values
62		*/
63		public function addAll($values)
64		{
65		if ($values) {
66		foreach ($values as $value) {
67		$this->internal[$value] = null;
68		}
69		}
70		}
71
72		/**
73		* Ensures that enough memory is allocated for a specified capacity. This
74		* potentially reduces the number of reallocations as the size increases.
75		*
76		* @param int $capacity The number of values for which capacity should be
77		* allocated. Capacity will stay the same if this value
78		* is less than or equal to the current capacity.
79		*/
80		public function allocate(int $capacity)
81		{
82		$this->internal->allocate($capacity);
83		}
84
85		/**
86		* Returns the current capacity of the set.
87		*
88		* @return int
89		*/
90		public function capacity(): int
91		{
92		return $this->internal->capacity();
93		}
94
95		/**
96		* Clear all elements in the Set
97		*/
98		public function clear()
99		{
100		$this->internal->clear();
101		}
102
103		/**
104		* Determines whether the set contains all of zero or more values.
105		*
106		* @param mixed ...$values
107		*
108		* @return bool true if at least one value was provided and the set
109		* contains all given values, false otherwise.
110		*/
		0 ignored issues – show Documentation introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Consider making the type for parameter `$values` a bit more specific; maybe use `array`. Loading history...
111	View Code Duplication	public function contains(...$values): bool
		0 ignored issues – show Duplication introduced 2016-03-01 00:43 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
112		{
113		if ( ! $values) {
		0 ignored issues – show Bug Best Practice introduced 2016-03-01 00:43 UTC by Report Bug Copy Issue Report The expression `$values` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
114		return false;
115		}
116
117		foreach ($values as $value) {
118		if ( ! $this->internal->containsKey($value)) {
119		return false;
120		}
121		}
122
123		return true;
124		}
125
126		/**
127		* @inheritDoc
128		*/
129		public function copy()
130		{
131		return new Set($this);
132		}
133
134		/**
135		* Returns the number of elements in the Stack
136		*
137		* @return int
138		*/
139		public function count(): int
140		{
141		return count($this->internal);
142		}
143
144		/**
145		* Creates a new set using values from this set that aren't in another set.
146		*
147		* Formally: A \ B = {x ∈ A \| x ∉ B}
148		*
149		* @param Set $set
150		*
151		* @return Set
152		*/
153		public function diff(Set $set): Set
154		{
155		$diff = new Set();
156
157		foreach ($this as $value) {
158		if ($set->contains($value)) {
159		continue;
160		}
161
162		$diff->add($value);
163		}
164
165		return $diff;
166		}
167
168		/**
169		* Creates a new set using values in either this set or in another set,
170		* but not in both.
171		*
172		* Formally: A ⊖ B = {x : x ∈ (A \ B) ∪ (B \ A)}
173		*
174		* @param Set $set
175		*
176		* @return Set
177		*/
178		public function xor(Set $set): Set
179		{
180		return $this->internal->xor($set->internal)->keys();
181		}
182
183		/**
184		* Returns a new set containing only the values for which a predicate
185		* returns true. A boolean test will be used if a predicate is not provided.
186		*
187		* @param callable\|null $predicate Accepts a value, returns a boolean:
188		* true : include the value,
189		* false: skip the value.
190		*
191		* @return Set
192		*/
193	View Code Duplication	public function filter(callable $predicate = null): Set
		0 ignored issues – show Duplication introduced 2016-03-04 22:18 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
194		{
195		$filtered = new Set();
196
197		foreach ($this as $value) {
198		if ($predicate ? $predicate($value) : $value) {
199		$filtered->add($value);
200		}
201		}
202
203		return $filtered;
204		}
205
206		/**
207		* Returns the first value in the set.
208		*
209		* @return mixed the first value in the set.
210		*/
211		public function first()
212		{
213		return $this->internal->first()->key;
214		}
215
216		/**
217		* Returns the value at a specified position in the set.
218		*
219		* @param int $position
220		*
221		* @return mixed\|null
222		*
223		* @throws OutOfRangeException
224		*/
225		public function get(int $position)
226		{
227		return $this->internal->skip($position)->key;
228		}
229
230		/**
231		* Creates a new set using values common to both this set and another set.
232		* In other words, returns a copy of this set with all values removed that
233		* aren't in the other set.
234		*
235		* Formally: A ∩ B = {x : x ∈ A ∧ x ∈ B}
236		*
237		* @param Set $set
238		*
239		* @return Set
240		*/
241		public function intersect(Set $set): Set
242		{
243		return $this->internal->intersect($set->internal)->keys();
244		}
245
246		/**
247		* @inheritDoc
248		*/
249		public function isEmpty(): bool
250		{
251		return $this->internal->isEmpty();
252		}
253
254		/**
255		* Joins all values of the set into a string, adding an optional 'glue'
256		* between them. Returns an empty string if the set is empty.
257		*
258		* @param string $glue
		0 ignored issues – show Documentation introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Should the type for parameter `$glue` not be `null\|string`? This check looks for `@param` annotations where the type inferred by our type inference engine differs from the declared type. It makes a suggestion as to what type it considers more descriptive. Most often this is a case of a parameter that can be null in addition to its declared types. Loading history...
259		*
260		* @return string
261		*/
262		public function join(string $glue = null): string
263		{
264		return implode($glue, $this->toArray());
265		}
266
267		/**
268		* Returns the last value in the set.
269		*
270		* @return mixed the last value in the set.
271		*/
272		public function last()
273		{
274		return $this->internal->last()->key;
275		}
276
277		/**
278		* Iteratively reduces the set to a single value using a callback.
279		*
280		* @param callable $callback Accepts the carry and current value, and
281		* returns an updated carry value.
282		*
283		* @param mixed\|null $initial Optional initial carry value.
284		*
285		* @return mixed The carry value of the final iteration, or the initial
286		* value if the set was empty.
287		*/
288		public function reduce(callable $callback, $initial = null)
289		{
290		$carry = $initial;
291
292		foreach ($this as $value) {
293		$carry = $callback($carry, $value);
294		}
295
296		return $carry;
297		}
298
299		/**
300		* Removes zero or more values from the set.
301		*
302		* @param mixed ...$values
303		*/
		0 ignored issues – show Documentation introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Consider making the type for parameter `$values` a bit more specific; maybe use `array`. Loading history...
304		public function remove(...$values)
305		{
306		foreach ($values as $value) {
307		$this->internal->remove($value, null);
308		}
309		}
310
311		/**
312		* Returns a reversed copy of the set.
313		*
314		* @return Set
315		*/
316		public function reverse(): Set
317		{
318		$reversed = new Set();
		0 ignored issues – show Coding Style introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Equals sign not aligned with surrounding assignments; expected 11 spaces but found 1 space This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line. To visualize $a = "a"; $ab = "ab"; $abc = "abc"; will produce issues in the first and second line, while this second example $a = "a"; $ab = "ab"; $abc = "abc"; will produce no issues. Loading history...
319		$reversed->internal = $this->internal->reverse();
320
321		return $reversed;
322		}
323
324		/**
325		* Returns a subset of a given length starting at a specified offset.
326		*
327		* @param int $offset If the offset is non-negative, the set will start
328		* at that offset in the set. If offset is negative,
329		* the set will start that far from the end.
330		*
331		* @param int $length If a length is given and is positive, the resulting
		0 ignored issues – show Documentation introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Should the type for parameter `$length` not be `null\|integer`? This check looks for `@param` annotations where the type inferred by our type inference engine differs from the declared type. It makes a suggestion as to what type it considers more descriptive. Most often this is a case of a parameter that can be null in addition to its declared types. Loading history...
332		* set will have up to that many values in it.
333		* If the requested length results in an overflow, only
334		* values up to the end of the set will be included.
335		*
336		* If a length is given and is negative, the set
337		* will stop that many values from the end.
338		*
339		* If a length is not provided, the resulting set
340		* will contains all values between the offset and the
341		* end of the set.
342		*
343		* @return Set
344		*/
345		public function slice(int $offset, int $length = null): Set
346		{
347		$sliced = new Set();
		0 ignored issues – show Coding Style introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Equals sign not aligned with surrounding assignments; expected 11 spaces but found 1 space This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line. To visualize $a = "a"; $ab = "ab"; $abc = "abc"; will produce issues in the first and second line, while this second example $a = "a"; $ab = "ab"; $abc = "abc"; will produce no issues. Loading history...
348		$sliced->internal = $this->internal->slice($offset, $length);
349
350		return $sliced;
351		}
352
353		/**
354		* Returns a sorted copy of the set, based on an optional callable
355		* comparator. Natural ordering will be used if a comparator is not given.
356		*
357		* @param callable\|null $comparator Accepts two values to be compared.
358		* Should return the result of a <=> b.
359		*
360		* @return Set
361		*/
362		public function sort(callable $comparator = null): Set
363		{
364		$set = new Set();
		0 ignored issues – show Coding Style introduced 2016-03-01 03:50 UTC by Report Bug Copy Issue Report Equals sign not aligned with surrounding assignments; expected 11 spaces but found 1 space This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line. To visualize $a = "a"; $ab = "ab"; $abc = "abc"; will produce issues in the first and second line, while this second example $a = "a"; $ab = "ab"; $abc = "abc"; will produce no issues. Loading history...
365		$set->internal = $this->internal->sort($comparator);
366
367		return $set;
368		}
369
370		/**
371		* @inheritDoc
372		*/
373		public function toArray(): array
374		{
375		return iterator_to_array($this);
376		}
377
378		/**
379		* Creates a new set that contains the values of this set as well as the
380		* values of another set.
381		*
382		* Formally: A ∪ B = {x: x ∈ A ∨ x ∈ B}
383		*
384		* @param Set $set
385		*
386		* @return Set
387		*/
388		public function union(Set $set): Set
389		{
390		$union = new Set();
391
392		foreach ($this as $value) {
393		$union->add($value);
394		}
395
396		foreach ($set as $value) {
397		$union->add($value);
398		}
399
400		return $union;
401		}
402
403		/**
404		* Get iterator
405		*/
406		public function getIterator()
407		{
408		foreach ($this->internal as $key => $value) {
409		yield $key;
410		}
411		}
412
413		/**
414		* @inheritdoc
415		*
416		* @throws OutOfBoundsException
417		*/
418		public function offsetSet($offset, $value)
419		{
420		if ($offset === null) {
421		$this->add($value);
422		return;
423		}
424
425		throw new OutOfBoundsException();
426		}
427
428		/**
429		* @inheritdoc
430		*/
431		public function offsetGet($offset)
432		{
433		return $this->internal->skip($offset)->key;
434		}
435
436		/**
437		* @inheritdoc
438		*
439		* @throws Error
440		*/
441		public function offsetExists($offset)
442		{
443		throw new Error();
444		}
445
446		/**
447		* @inheritdoc
448		*
449		* @throws Error
450		*/
451		public function offsetUnset($offset)
452		{
453		throw new Error();
454		}
455		}
456

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