Sequence::map() - Code Metrics - Inspection of "Adding Boundary support to the Period package" - thephpleague/period - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#73)

by ignace nyamagana

created 2019-01-14 19:56 UTC

Sequence::map() A

↳ Parent: Sequence

Complexity

Conditions	3
Paths	4

Size

Total Lines	15
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	8
nc	4
nop	1
dl	0
loc	15
ccs	9
cts	9
cp	1
crap	3
rs	10
c	0
b	0
f	0

<?php

/**
 * League.Period (https://period.thephpleague.com)
 *
 * (c) Ignace Nyamagana Butera <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\Period;

use ArrayAccess;
use Countable;
use Iterator;
use IteratorAggregate;
use JsonSerializable;
use function array_filter;
use function array_merge;
use function array_splice;
use function array_unshift;
use function array_values;
use function count;
use function reset;
use function sort;
use function sprintf;
use function uasort;
use function usort;
use const ARRAY_FILTER_USE_BOTH;

/**
 * A class to manipulate interval collection.
 *
 * @package League.period
 * @author  Ignace Nyamagana Butera <[email protected]>
 * @since   4.1.0
 */
final class Sequence implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable
{
    /**
     * @var Period[]
     */
    private $intervals = [];

    /**
     * new instance.
     *
     * @param Period ...$intervals
     */
    public function __construct(Period ...$intervals)
    {
        $this->intervals = $intervals;
    }

    /**
     * Returns the sequence boundaries as a Period instance.
     *
     * If the sequence contains no interval null is returned.
     *
     * @return ?Period
     */
    public function boundaries(): ?Period
    {
        $period = reset($this->intervals);
        if (false === $period) {
            return null;
        }

        return $period->merge(...$this->intervals);
    }

    /**
     * Returns the gaps inside the instance.
     */
    public function gaps(): self
    {
        $sequence = new self();
        $interval = null;
        foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
            if (null === $interval) {
                $interval = $period;
                continue;
            }

            if (!$interval->overlaps($period) && !$interval->abuts($period)) {
                $sequence->push($interval->gap($period));
            }

            if (!$interval->contains($period)) {
                $interval = $period;
            }
        }

        return $sequence;
    }

    /**
     * Sorts two Interval instance using their start datepoint.
     */
    private function sortByStartDate(Period $interval1, Period $interval2): int
    {
        return $interval1->getStartDate() <=> $interval2->getStartDate();
    }

    /**
     * Returns the intersections inside the instance.
     */
    public function intersections(): self
    {
        $sequence = new self();
        $current = null;
        $isPreviouslyContained = false;
        foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
            if (null === $current) {
                $current = $period;
                continue;
            }

            $isContained = $current->contains($period);
            if ($isContained && $isPreviouslyContained) {
                continue;
            }

            if ($current->overlaps($period)) {
                $sequence->push($current->intersect($period));
            }

            $isPreviouslyContained = $isContained;
            if (!$isContained) {
                $current = $period;
            }
        }

        return $sequence;
    }

    /**
     * Returns the unions inside the instance.
     */
    public function unions(): self
    {
        $sequence = new self();
        foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
            if ($sequence->isEmpty()) {
                $sequence->push($period);
                continue;
            }

            $index = $sequence->count() - 1;
            $interval = $sequence->get($index);
            if ($interval->overlaps($period) || $interval->abuts($period)) {
                $sequence->set($index, $interval->merge($period));
                continue;
            }

            $sequence->push($period);
        }

        if ($sequence->intervals === $this->intervals) {
            return $this;
        }

        return $sequence;
    }

    /**
     * Returns the sequence boundaries as a Period instance.
     *
     * DEPRECATION WARNING! This method will be removed in the next major point release
     *
     * @deprecated deprecated since version 4.4.0
     * @see        ::boundaries
     *
     * If the sequence contains no interval null is returned.
     *
     * @return ?Period
     */
    public function getBoundaries(): ?Period
    {
        return $this->boundaries();
    }

    /**
     * Returns the intersections inside the instance.
     *
     * DEPRECATION WARNING! This method will be removed in the next major point release
     *
     * @deprecated deprecated since version 4.4.0
     * @see        ::intersections
     */
    public function getIntersections(): self
    {
        return $this->intersections();
    }

    /**
     * Returns the gaps inside the instance.
     *
     * DEPRECATION WARNING! This method will be removed in the next major point release
     *
     * @deprecated deprecated since version 4.4.0
     * @see        ::gaps
     */
    public function getGaps(): self
    {
        return $this->gaps();
    }

    /**
     * Tells whether some intervals in the current instance satisfies the predicate.
     */
    public function some(callable $predicate): bool
    {
        foreach ($this->intervals as $offset => $interval) {
            if (true === $predicate($interval, $offset)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Tells whether all intervals in the current instance satisfies the predicate.
     */
    public function every(callable $predicate): bool
    {
        foreach ($this->intervals as $offset => $interval) {
            if (true !== $predicate($interval, $offset)) {
                return false;
            }
        }

        return [] !== $this->intervals;
    }

    /**
     * Returns the array representation of the sequence.
     *
     * @return Period[]
     */
    public function toArray(): array
    {
        return $this->intervals;
    }

    /**
     * {@inheritdoc}
     */
    public function jsonSerialize(): array
    {
        return $this->intervals;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator(): Iterator
    {
        foreach ($this->intervals as $offset => $interval) {
            yield $offset => $interval;
        }
    }

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

    /**
     * @inheritdoc
     *
     * @param int $offset
     */
    public function offsetExists($offset): bool
    {
        return isset($this->intervals[$offset]);
    }

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

    /**
     * @inheritdoc
     *
     * @param int $offset
     */
    public function offsetUnset($offset): void
    {
        $this->remove($offset);
    }

    /**
     * @inheritdoc
     *
     * @param mixed|int $offset
     * @param Period    $interval
     */
    public function offsetSet($offset, $interval): void
    {
        if (null !== $offset) {
            $this->set($offset, $interval);
            return;
        }

        $this->push($interval);
    }

    /**
     * Tells whether the sequence is empty.
     */
    public function isEmpty(): bool
    {
        return [] === $this->intervals;
    }

    /**
     * Tells whether the given interval is present in the sequence.
     *
     * @param Period ...$intervals
     */
    public function contains(Period $interval, Period ...$intervals): bool
    {
        $intervals[] = $interval;
        foreach ($intervals as $period) {
            if (false === $this->indexOf($period)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Attempts to find the first offset attached to the submitted interval.
     *
     * If no offset is found the method returns boolean false.
     *
     * @return int|bool
     */
    public function indexOf(Period $interval)
    {
        foreach ($this->intervals as $offset => $period) {
            if ($period->equals($interval)) {
                return $offset;
            }
        }

        return false;
    }

    /**
     * Returns the interval specified at a given offset.
     *
     * @throws InvalidIndex If the offset is illegal for the current sequence
     */
    public function get(int $offset): Period
    {
        $period = $this->intervals[$offset] ?? null;
        if (null !== $period) {
            return $period;
        }

        throw new InvalidIndex(sprintf('%s is an invalid offset in the current sequence', $offset));
    }

    /**
     * Sort the current instance according to the given comparison callable
     * and maintain index association.
     *
     * Returns true on success or false on failure
     */
    public function sort(callable $compare): bool
    {
        return uasort($this->intervals, $compare);
    }

    /**
     * Adds new intervals at the front of the sequence.
     *
     * The sequence is re-indexed after addition
     *
     * @param Period ...$intervals
     */
    public function unshift(Period $interval, Period ...$intervals): void
    {
        $this->intervals = array_merge([$interval], $intervals, $this->intervals);
    }

    /**
     * Adds new intervals at the end of the sequence.
     *
     * @param Period ...$intervals
     */
    public function push(Period $interval, Period ...$intervals): void
    {
        $this->intervals = array_merge($this->intervals, [$interval], $intervals);
    }

    /**
     * Inserts new intervals at the specified offset of the sequence.
     *
     * The sequence is re-indexed after addition
     *
     * @param Period ...$intervals
     *
     * @throws InvalidIndex If the offset is illegal for the current sequence.
     */
    public function insert(int $offset, Period $interval, Period ...$intervals): void
    {
        if ($offset < 0 || $offset > count($this->intervals)) {
            throw new InvalidIndex(sprintf('%s is an invalid offset in the current sequence', $offset));
        }

        array_unshift($intervals, $interval);
        array_splice($this->intervals, $offset, 0, $intervals);
    }

    /**
     * Updates the interval at the specify offset.
     *
     * @throws InvalidIndex If the offset is illegal for the current sequence.
     */
    public function set(int $offset, Period $interval): void
    {
        $this->get($offset);
        $this->intervals[$offset] = $interval;
    }

    /**
     * Removes an interval from the sequence at the given offset and returns it.
     *
     * The sequence is re-indexed after removal
     *
     * @throws InvalidIndex If the offset is illegal for the current sequence.
     */
    public function remove(int $offset): Period
    {
        $interval = $this->get($offset);
        unset($this->intervals[$offset]);

        $this->intervals = array_values($this->intervals);

        return $interval;
    }

    /**
     * Filters the sequence according to the given predicate.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the interval which validate the predicate.
     */
    public function filter(callable $predicate): self
    {
        $intervals = array_filter($this->intervals, $predicate, ARRAY_FILTER_USE_BOTH);
        if ($intervals === $this->intervals) {
            return $this;
        }

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

    /**
     * Removes all intervals from the sequence.
     */
    public function clear(): void
    {
        $this->intervals = [];
    }

    /**
     * Returns an instance sorted according to the given comparison callable
     * but does not maintain index association.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the sorted intervals. The key are re-indexed
     */
    public function sorted(callable $compare): self
    {
        $intervals = $this->intervals;
        usort($intervals, $compare);
        if ($intervals === $this->intervals) {
            return $this;
        }

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

    /**
     * Returns an instance where the given function is applied to each element in
     * the collection. The callable MUST return a Period object and takes a Period
     * and its associated key as argument.
     *
     * This method MUST retain the state of the current instance, and return
     * an instance that contains the returned intervals.
     */
    public function map(callable $func): self
    {
        $intervals = [];
        foreach ($this->intervals as $offset => $interval) {
            $intervals[$offset] = $func($interval, $offset);
        }

        if ($intervals === $this->intervals) {
            return $this;
        }

        $mapped = new self();
        $mapped->intervals = $intervals;

        return $mapped;
    }
}


1		<?php
2
3		/**
4		* League.Period (https://period.thephpleague.com)
5		*
6		* (c) Ignace Nyamagana Butera <[email protected]>
7		*
8		* For the full copyright and license information, please view the LICENSE
9		* file that was distributed with this source code.
10		*/
11
12		declare(strict_types=1);
13
14		namespace League\Period;
15
16		use ArrayAccess;
17		use Countable;
18		use Iterator;
19		use IteratorAggregate;
20		use JsonSerializable;
21		use function array_filter;
22		use function array_merge;
23		use function array_splice;
24		use function array_unshift;
25		use function array_values;
26		use function count;
27		use function reset;
28		use function sort;
29		use function sprintf;
30		use function uasort;
31		use function usort;
32		use const ARRAY_FILTER_USE_BOTH;
33
34		/**
35		* A class to manipulate interval collection.
36		*
37		* @package League.period
38		* @author Ignace Nyamagana Butera <[email protected]>
39		* @since 4.1.0
40		*/
41		final class Sequence implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable
42		{
43		/**
44		* @var Period[]
45		*/
46		private $intervals = [];
47
48		/**
49		* new instance.
50		*
51		* @param Period ...$intervals
52		*/
53	87	public function __construct(Period ...$intervals)
54		{
55	87	$this->intervals = $intervals;
56	87	}
57
58		/**
59		* Returns the sequence boundaries as a Period instance.
60		*
61		* If the sequence contains no interval null is returned.
62		*
63		* @return ?Period
64		*/
65	12	public function boundaries(): ?Period
66		{
67	12	$period = reset($this->intervals);
68	12	if (false === $period) {
69	6	return null;
70		}
71
72	12	return $period->merge(...$this->intervals);
73		}
74
75		/**
76		* Returns the gaps inside the instance.
77		*/
78	9	public function gaps(): self
79		{
80	9	$sequence = new self();
81	9	$interval = null;
82	9	foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
83	9	if (null === $interval) {
84	9	$interval = $period;
85	9	continue;
86		}
87
88	9	if (!$interval->overlaps($period) && !$interval->abuts($period)) {
89	6	$sequence->push($interval->gap($period));
90		}
91
92	9	if (!$interval->contains($period)) {
93	8	$interval = $period;
94		}
95		}
96
97	9	return $sequence;
98		}
99
100		/**
101		* Sorts two Interval instance using their start datepoint.
102		*/
103	15	private function sortByStartDate(Period $interval1, Period $interval2): int
104		{
105	15	return $interval1->getStartDate() <=> $interval2->getStartDate();
106		}
107
108		/**
109		* Returns the intersections inside the instance.
110		*/
111	9	public function intersections(): self
112		{
113	9	$sequence = new self();
114	9	$current = null;
115	9	$isPreviouslyContained = false;
116	9	foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
117	9	if (null === $current) {
118	9	$current = $period;
119	9	continue;
120		}
121
122	9	$isContained = $current->contains($period);
123	9	if ($isContained && $isPreviouslyContained) {
124	3	continue;
125		}
126
127	9	if ($current->overlaps($period)) {
128	6	$sequence->push($current->intersect($period));
129		}
130
131	9	$isPreviouslyContained = $isContained;
132	9	if (!$isContained) {
133	8	$current = $period;
134		}
135		}
136
137	9	return $sequence;
138		}
139
140		/**
141		* Returns the unions inside the instance.
142		*/
143	6	public function unions(): self
144		{
145	6	$sequence = new self();
146	6	foreach ($this->sorted([$this, 'sortByStartDate']) as $period) {
147	6	if ($sequence->isEmpty()) {
148	6	$sequence->push($period);
149	6	continue;
150		}
151
152	3	$index = $sequence->count() - 1;
153	3	$interval = $sequence->get($index);
154	3	if ($interval->overlaps($period) \|\| $interval->abuts($period)) {
155	3	$sequence->set($index, $interval->merge($period));
156	3	continue;
157		}
158
159	3	$sequence->push($period);
160		}
161
162	6	if ($sequence->intervals === $this->intervals) {
163	3	return $this;
164		}
165
166	3	return $sequence;
167		}
168
169		/**
170		* Returns the sequence boundaries as a Period instance.
171		*
172		* DEPRECATION WARNING! This method will be removed in the next major point release
173		*
174		* @deprecated deprecated since version 4.4.0
175		* @see ::boundaries
176		*
177		* If the sequence contains no interval null is returned.
178		*
179		* @return ?Period
180		*/
181	12	public function getBoundaries(): ?Period
182		{
183	12	return $this->boundaries();
184		}
185
186		/**
187		* Returns the intersections inside the instance.
188		*
189		* DEPRECATION WARNING! This method will be removed in the next major point release
190		*
191		* @deprecated deprecated since version 4.4.0
192		* @see ::intersections
193		*/
194	9	public function getIntersections(): self
195		{
196	9	return $this->intersections();
197		}
198
199		/**
200		* Returns the gaps inside the instance.
201		*
202		* DEPRECATION WARNING! This method will be removed in the next major point release
203		*
204		* @deprecated deprecated since version 4.4.0
205		* @see ::gaps
206		*/
207	9	public function getGaps(): self
208		{
209	9	return $this->gaps();
210		}
211
212		/**
213		* Tells whether some intervals in the current instance satisfies the predicate.
214		*/
215	3	public function some(callable $predicate): bool
216		{
217	3	foreach ($this->intervals as $offset => $interval) {
218	3	if (true === $predicate($interval, $offset)) {
219	3	return true;
220		}
221		}
222
223	3	return false;
224		}
225
226		/**
227		* Tells whether all intervals in the current instance satisfies the predicate.
228		*/
229	3	public function every(callable $predicate): bool
230		{
231	3	foreach ($this->intervals as $offset => $interval) {
232	3	if (true !== $predicate($interval, $offset)) {
233	2	return false;
234		}
235		}
236
237	3	return [] !== $this->intervals;
238		}
239
240		/**
241		* Returns the array representation of the sequence.
242		*
243		* @return Period[]
244		*/
245	6	public function toArray(): array
246		{
247	6	return $this->intervals;
248		}
249
250		/**
251		* {@inheritdoc}
252		*/
253	3	public function jsonSerialize(): array
254		{
255	3	return $this->intervals;
256		}
257
258		/**
259		* {@inheritdoc}
260		*/
261	21	public function getIterator(): Iterator
262		{
263	21	foreach ($this->intervals as $offset => $interval) {
264	21	yield $offset => $interval;
265		}
266	21	}
267
268		/**
269		* {@inheritdoc}
270		*/
271	30	public function count(): int
272		{
273	30	return count($this->intervals);
274		}
275
276		/**
277		* @inheritdoc
278		*
279		* @param int $offset
280		*/
281	3	public function offsetExists($offset): bool
282		{
283	3	return isset($this->intervals[$offset]);
284		}
285
286		/**
287		* @inheritdoc
288		*
289		* @param int $offset
290		*/
291	3	public function offsetGet($offset): Period
292		{
293	3	return $this->get($offset);
294		}
295
296		/**
297		* @inheritdoc
298		*
299		* @param int $offset
300		*/
301	6	public function offsetUnset($offset): void
302		{
303	6	$this->remove($offset);
304	3	}
305
306		/**
307		* @inheritdoc
308		*
309		* @param mixed\|int $offset
310		* @param Period $interval
311		*/
312	9	public function offsetSet($offset, $interval): void
313		{
314	9	if (null !== $offset) {
315	9	$this->set($offset, $interval);
316	3	return;
317		}
318
319	3	$this->push($interval);
320	3	}
321
322		/**
323		* Tells whether the sequence is empty.
324		*/
325	15	public function isEmpty(): bool
326		{
327	15	return [] === $this->intervals;
328		}
329
330		/**
331		* Tells whether the given interval is present in the sequence.
332		*
333		* @param Period ...$intervals
334		*/
335	6	public function contains(Period $interval, Period ...$intervals): bool
336		{
337	6	$intervals[] = $interval;
338	6	foreach ($intervals as $period) {
339	6	if (false === $this->indexOf($period)) {
340	5	return false;
341		}
342		}
343
344	6	return true;
345		}
346
347		/**
348		* Attempts to find the first offset attached to the submitted interval.
349		*
350		* If no offset is found the method returns boolean false.
351		*
352		* @return int\|bool
353		*/
354	6	public function indexOf(Period $interval)
355		{
356	6	foreach ($this->intervals as $offset => $period) {
357	6	if ($period->equals($interval)) {
358	6	return $offset;
359		}
360		}
361
362	6	return false;
363		}
364
365		/**
366		* Returns the interval specified at a given offset.
367		*
368		* @throws InvalidIndex If the offset is illegal for the current sequence
369		*/
370	39	public function get(int $offset): Period
371		{
372	39	$period = $this->intervals[$offset] ?? null;
373	39	if (null !== $period) {
374	30	return $period;
375		}
376
377	15	throw new InvalidIndex(sprintf('%s is an invalid offset in the current sequence', $offset));
378		}
379
380		/**
381		* Sort the current instance according to the given comparison callable
382		* and maintain index association.
383		*
384		* Returns true on success or false on failure
385		*/
386	6	public function sort(callable $compare): bool
387		{
388	6	return uasort($this->intervals, $compare);
389		}
390
391		/**
392		* Adds new intervals at the front of the sequence.
393		*
394		* The sequence is re-indexed after addition
395		*
396		* @param Period ...$intervals
397		*/
398	3	public function unshift(Period $interval, Period ...$intervals): void
399		{
400	3	$this->intervals = array_merge([$interval], $intervals, $this->intervals);
401	3	}
402
403		/**
404		* Adds new intervals at the end of the sequence.
405		*
406		* @param Period ...$intervals
407		*/
408	24	public function push(Period $interval, Period ...$intervals): void
409		{
410	24	$this->intervals = array_merge($this->intervals, [$interval], $intervals);
411	24	}
412
413		/**
414		* Inserts new intervals at the specified offset of the sequence.
415		*
416		* The sequence is re-indexed after addition
417		*
418		* @param Period ...$intervals
419		*
420		* @throws InvalidIndex If the offset is illegal for the current sequence.
421		*/
422	3	public function insert(int $offset, Period $interval, Period ...$intervals): void
423		{
424	3	if ($offset < 0 \|\| $offset > count($this->intervals)) {
425	3	throw new InvalidIndex(sprintf('%s is an invalid offset in the current sequence', $offset));
426		}
427
428	3	array_unshift($intervals, $interval);
429	3	array_splice($this->intervals, $offset, 0, $intervals);
430	3	}
431
432		/**
433		* Updates the interval at the specify offset.
434		*
435		* @throws InvalidIndex If the offset is illegal for the current sequence.
436		*/
437	12	public function set(int $offset, Period $interval): void
438		{
439	12	$this->get($offset);
440	9	$this->intervals[$offset] = $interval;
441	9	}
442
443		/**
444		* Removes an interval from the sequence at the given offset and returns it.
445		*
446		* The sequence is re-indexed after removal
447		*
448		* @throws InvalidIndex If the offset is illegal for the current sequence.
449		*/
450	9	public function remove(int $offset): Period
451		{
452	9	$interval = $this->get($offset);
453	6	unset($this->intervals[$offset]);
454
455	6	$this->intervals = array_values($this->intervals);
456
457	6	return $interval;
458		}
459
460		/**
461		* Filters the sequence according to the given predicate.
462		*
463		* This method MUST retain the state of the current instance, and return
464		* an instance that contains the interval which validate the predicate.
465		*/
466	6	public function filter(callable $predicate): self
467		{
468	6	$intervals = array_filter($this->intervals, $predicate, ARRAY_FILTER_USE_BOTH);
469	6	if ($intervals === $this->intervals) {
470	3	return $this;
471		}
472
473	3	return new self(...$intervals);
474		}
475
476		/**
477		* Removes all intervals from the sequence.
478		*/
479	3	public function clear(): void
480		{
481	3	$this->intervals = [];
482	3	}
483
484		/**
485		* Returns an instance sorted according to the given comparison callable
486		* but does not maintain index association.
487		*
488		* This method MUST retain the state of the current instance, and return
489		* an instance that contains the sorted intervals. The key are re-indexed
490		*/
491	24	public function sorted(callable $compare): self
492		{
493	24	$intervals = $this->intervals;
494	24	usort($intervals, $compare);
495	24	if ($intervals === $this->intervals) {
496	12	return $this;
497		}
498
499	15	return new self(...$intervals);
500		}
501
502		/**
503		* Returns an instance where the given function is applied to each element in
504		* the collection. The callable MUST return a Period object and takes a Period
505		* and its associated key as argument.
506		*
507		* This method MUST retain the state of the current instance, and return
508		* an instance that contains the returned intervals.
509		*/
510	9	public function map(callable $func): self
511		{
512	9	$intervals = [];
513	9	foreach ($this->intervals as $offset => $interval) {
514	9	$intervals[$offset] = $func($interval, $offset);
515		}
516
517	9	if ($intervals === $this->intervals) {
518	3	return $this;
519		}
520
521	6	$mapped = new self();
522	6	$mapped->intervals = $intervals;
523
524	6	return $mapped;
525		}
526		}
527

thephpleague / period

Pull Request — master (#73)

Sequence::map() A

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