mappings.php ➔ cache() - Code Metrics - Inspection of "Merge pull request #56 from zicht/feature/add-cach..." - zicht/itertools - Measure and Improve Code Quality continuously with Scrutinizer

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created 2020-01-20 13:22 UTC

mappings.php ➔ cache() A

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Complexity

Conditions	2
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
nc	1
nop	2
dl	0
loc	13
ccs	8
cts	8
cp	1
crap	2
rs	9.8333
c	0
b	0
f	0

<?php
/**
 * @copyright Zicht Online <http://zicht.nl>
 */

namespace Zicht\Itertools\mappings;

use Zicht\Itertools\conversions;

/**
 * Returns a closure that strips any matching $CHARS from the left of the input string
 *
 * @param string $chars
 * @return \Closure
 */
function lstrip($chars = " \t\n\r\0\x0B")
{
    return function ($value) use ($chars) {
        return ltrim($value, $chars);
    };
}

/**
 * Returns a closure that strips any matching $CHARS from the right of the input string
 *
 * @param string $chars
 * @return \Closure
 */
function rstrip($chars = " \t\n\r\0\x0B")
{
    return function ($value) use ($chars) {
        return rtrim($value, $chars);
    };
}

/**
 * Returns a closure that strips any matching $CHARS from the left and right of the input string
 *
 * @param string $chars
 * @return \Closure
 */
function strip($chars = " \t\n\r\0\x0B")
{
    return function ($value) use ($chars) {
        return trim($value, $chars);
    };
}

/**
 * Returns a closure that returns the length of the input
 *
 * @return \Closure
 */
function length()
{
    return function ($value) {
        if (is_null($value)) {
            return 0;
        }

        if (is_string($value)) {
            return strlen($value);
        }

        return sizeof($value);
    };
}

/**
 * Returns a closure that returns the key
 *
 * @return \Closure
 */
function key()
{
    return function ($value, $key) {
        return $key;
    };
}

/**
 * Returns a closure that returns the string value lower cased
 *
 * @return \Closure
 */
function lower()
{
    return function ($value) {
        return strtolower($value);
    };
}

/**
 * Returns a closure that returns the string value upper cased
 *
 * @return \Closure
 */
function upper()
{
    return function ($value) {
        return strtoupper($value);
    };
}

/**
 * Returns a closure that returns the value cast to a string
 *
 * @return \Closure
 */
function string()
{
    return function ($value) {
        return (string)$value;
    };
}

/**
 * Returns a closure that returns the value as a json_encoded string
 *
 * @param int $options
 * @param int $depth
 * @return \Closure
 */
function json_encode($options = 0, $depth = 512)
{
    return function ($value) use ($options, $depth) {
        return \json_encode($value, $options, $depth);
    };
}

/**
 * Returns a closure that returns the json_encoded value as decoded value
 *
 * @param boolean $assoc
 * @param int $depth
 * @param int $options
 * @return \Closure
 */
function json_decode($assoc = false, $depth = 512, $options = 0)
{
    return function ($value) use ($assoc, $depth, $options) {
        return \json_decode($value, $assoc, $depth, $options);
    };
}

/**
 * Returns a closure that applies multiple $STRATEGIES to the value and returns the results
 *
 * > $compute = function ($value, $key) {
 * >    return 'some computation result';
 * > };
 * > $list = iter\iterable([new Data(1), new Data(2), new Data(3)]);
 * > $list->map(select(['data' => null, 'id' => 'Identifier', 'desc' => 'Value.DescriptionName', 'comp' => $compute]));
 * [
 *    [
 *       'data' => Data(1),
 *       'id' => Data(1)->Identifier,
 *       'desc' => Data(1)->Value->DescriptionName,
 *       'comp' => $compute(Data(1), 0),
 *    ],
 *    ...
 *    [
 *       'data' => Data(3),
 *       'id' => Data(3)->Identifier,
 *       'desc' => Data(3)->Value->DescriptionName,
 *       'comp' => $compute(Data(3), 2),
 *    ],
 * ]
 *
 * @param array|object $mappings
 * @param null|string|\Closure $strategy
 * @param boolean $discardNull
 * @param boolean $discardEmptyContainer
 * @return \Closure
 */
function select($mappings, $strategy = null, $discardNull = false, $discardEmptyContainer = false)
{
    $castToObject = is_object($mappings);
    $mappings = array_map('\Zicht\Itertools\conversions\mixed_to_value_getter', (array)$mappings);
    $strategy = conversions\mixed_to_value_getter($strategy);

    return function ($value, $key) use ($mappings, $strategy, $discardNull, $discardEmptyContainer, $castToObject) {
        $value = $strategy($value);
        $res = [];
        foreach ($mappings as $strategyKey => $strategy) {
            $res[$strategyKey] = $strategy($value, $key);
        }
        if ($discardNull || $discardEmptyContainer) {
            $res = array_filter(
                $res,
                function ($value) use ($discardNull, $discardEmptyContainer) {
                    if (null === $value) {
                        return !$discardNull;
                    }

                    if (is_array($value) && 0 === sizeof($value)) {
                        return !$discardEmptyContainer;
                    }

                    return true;
                }
            );
        }
        return $castToObject ? (object)$res : $res;
    };
}

/**
 * Returns a closure that returns random integer numbers between $MIN and $MAX
 *
 * @param int $min
 * @param null|int $max
 * @return \Closure
 */
function random($min = 0, $max = null)
{
    if (null === $max) {
        $max = getrandmax();
    }

    return function () use ($min, $max) {
        return rand($min, $max);
    };
}

/**
 * Returns a closure that returns either the class name, given an object, or otherwise the type
 *
 * @param null|string|\Closure $strategy
 * @return \Closure
 */
function type($strategy = null)
{
    $strategy = conversions\mixed_to_value_getter($strategy);
    return function ($value) use ($strategy) {
        $value = $strategy($value);
        return is_object($value) ? get_class($value) : gettype($value);
    };
}

/**
 * Returns a closure that calls the mapping on each element once.
 *
 * > $compute = function ($value, $key) {
 * >    return 'some expensive computation result';
 * > };
 * > $list = iter\iterable([['id' => 42, ...], ['id' => 43, ...], ['id' => 42, ...]]);
 * > $list->map(cache($compute, 'id'));
 * [
 *    $compute(['id' => 42, ...]), // <-- calls the $compute method
 *    $compute(['id' => 43, ...]), // <-- calls the $compute method
 *    $compute(['id' => 42, ...])  // <-- does not call, instead, populates with cached values
 * ]
 *
 * @param null|string|\Closure $mapping
 * @param null|string|\Closure $strategy
 * @return \Closure
 */
function cache($mapping, $strategy = null)
{
    $mapping = conversions\mixed_to_value_getter($mapping);
    $strategy = conversions\mixed_to_value_getter($strategy);
    $cache = [];
    return function ($value, $key = null) use ($mapping, $strategy, &$cache) {
        $cacheKey = \json_encode($strategy($value, $key));
        if (!array_key_exists($cacheKey, $cache)) {
            $cache[$cacheKey] = $mapping($value, $key);
        }
        return $cache[$cacheKey];
    };
}

/**
 * Returns a mapping closure
 *
 * @param string $name
 * @return \Closure
 * @throws \InvalidArgumentException
 *
 * @deprecated please use the mapping functions directly, will be removed in version 3.0
 */
function get_mapping($name /* [argument, [arguments, ...] */)
{
    if (is_string($name)) {
        switch ($name) {
            case 'ltrim':
            case 'lstrip':
                return call_user_func_array('\Zicht\Itertools\mappings\lstrip', array_slice(func_get_args(), 1));

            case 'rtrim':
            case 'rstrip':
                return call_user_func_array('\Zicht\Itertools\mappings\rstrip', array_slice(func_get_args(), 1));

            case 'trim':
            case 'strip':
                return call_user_func_array('\Zicht\Itertools\mappings\strip', array_slice(func_get_args(), 1));

            case 'length':
                return length();

            case 'key':
                return key();

            case 'select':
                return call_user_func_array('\Zicht\Itertools\mappings\select', array_slice(func_get_args(), 1));

            case 'random':
                return call_user_func_array('\Zicht\Itertools\mappings\random', array_slice(func_get_args(), 1));

            case 'type':
                return call_user_func_array('\Zicht\Itertools\mappings\type', array_slice(func_get_args(), 1));
        }
    }

    throw new \InvalidArgumentException(sprintf('$NAME "%s" is not a valid mapping.', $name));
}

/**
 * @param string $name
 * @return \Closure
 * @throws \InvalidArgumentException
 *
 * @deprecated please use the mapping functions directly, will be removed in version 3.0
 */
function getMapping($name /* [argument, [arguments, ...] */) // phpcs:ignore Zicht.NamingConventions.Functions.GlobalNaming

{
    return call_user_func_array('\Zicht\Itertools\mappings\get_mapping', func_get_args());
}


1		<?php
2		/**
3		* @copyright Zicht Online <http://zicht.nl>
4		*/
5
6		namespace Zicht\Itertools\mappings;
7
8		use Zicht\Itertools\conversions;
9
10		/**
11		* Returns a closure that strips any matching $CHARS from the left of the input string
12		*
13		* @param string $chars
14		* @return \Closure
15		*/
16		function lstrip($chars = " \t\n\r\0\x0B")
17		{
18		return function ($value) use ($chars) {
19	5	return ltrim($value, $chars);
20	5	};
21		}
22
23		/**
24		* Returns a closure that strips any matching $CHARS from the right of the input string
25		*
26		* @param string $chars
27		* @return \Closure
28		*/
29		function rstrip($chars = " \t\n\r\0\x0B")
30		{
31		return function ($value) use ($chars) {
32	5	return rtrim($value, $chars);
33	5	};
34		}
35
36		/**
37		* Returns a closure that strips any matching $CHARS from the left and right of the input string
38		*
39		* @param string $chars
40		* @return \Closure
41		*/
42		function strip($chars = " \t\n\r\0\x0B")
43		{
44		return function ($value) use ($chars) {
45	5	return trim($value, $chars);
46	6	};
47		}
48
49		/**
50		* Returns a closure that returns the length of the input
51		*
52		* @return \Closure
53		*/
54		function length()
55		{
56		return function ($value) {
57	3	if (is_null($value)) {
58	3	return 0;
59		}
60
61	3	if (is_string($value)) {
62	3	return strlen($value);
63		}
64
65	3	return sizeof($value);
66	3	};
67		}
68
69		/**
70		* Returns a closure that returns the key
71		*
72		* @return \Closure
73		*/
74		function key()
75		{
76		return function ($value, $key) {
77	5	return $key;
78	5	};
79		}
80
81		/**
82		* Returns a closure that returns the string value lower cased
83		*
84		* @return \Closure
85		*/
86		function lower()
87		{
88		return function ($value) {
89	1	return strtolower($value);
90	1	};
91		}
92
93		/**
94		* Returns a closure that returns the string value upper cased
95		*
96		* @return \Closure
97		*/
98		function upper()
99		{
100		return function ($value) {
101	1	return strtoupper($value);
102	1	};
103		}
104
105		/**
106		* Returns a closure that returns the value cast to a string
107		*
108		* @return \Closure
109		*/
110		function string()
111		{
112		return function ($value) {
113	1	return (string)$value;
114	1	};
115		}
116
117		/**
118		* Returns a closure that returns the value as a json_encoded string
119		*
120		* @param int $options
121		* @param int $depth
122		* @return \Closure
123		*/
124		function json_encode($options = 0, $depth = 512)
125		{
126		return function ($value) use ($options, $depth) {
127	1	return \json_encode($value, $options, $depth);
128	1	};
129		}
130
131		/**
132		* Returns a closure that returns the json_encoded value as decoded value
133		*
134		* @param boolean $assoc
135		* @param int $depth
136		* @param int $options
137		* @return \Closure
138		*/
139		function json_decode($assoc = false, $depth = 512, $options = 0)
140		{
141		return function ($value) use ($assoc, $depth, $options) {
142	1	return \json_decode($value, $assoc, $depth, $options);
143	1	};
144		}
145
146		/**
147		* Returns a closure that applies multiple $STRATEGIES to the value and returns the results
148		*
149		* > $compute = function ($value, $key) {
150		* > return 'some computation result';
151		* > };
152		* > $list = iter\iterable([new Data(1), new Data(2), new Data(3)]);
153		* > $list->map(select(['data' => null, 'id' => 'Identifier', 'desc' => 'Value.DescriptionName', 'comp' => $compute]));
154		* [
155		* [
156		* 'data' => Data(1),
157		* 'id' => Data(1)->Identifier,
158		* 'desc' => Data(1)->Value->DescriptionName,
159		* 'comp' => $compute(Data(1), 0),
160		* ],
161		* ...
162		* [
163		* 'data' => Data(3),
164		* 'id' => Data(3)->Identifier,
165		* 'desc' => Data(3)->Value->DescriptionName,
166		* 'comp' => $compute(Data(3), 2),
167		* ],
168		* ]
169		*
170		* @param array\|object $mappings
171		* @param null\|string\|\Closure $strategy
172		* @param boolean $discardNull
173		* @param boolean $discardEmptyContainer
174		* @return \Closure
175		*/
176		function select($mappings, $strategy = null, $discardNull = false, $discardEmptyContainer = false)
177		{
178	9	$castToObject = is_object($mappings);
179	9	$mappings = array_map('\Zicht\Itertools\conversions\mixed_to_value_getter', (array)$mappings);
180	9	$strategy = conversions\mixed_to_value_getter($strategy);
181
182		return function ($value, $key) use ($mappings, $strategy, $discardNull, $discardEmptyContainer, $castToObject) {
183	9	$value = $strategy($value);
184	9	$res = [];
185	9	foreach ($mappings as $strategyKey => $strategy) {
186	7	$res[$strategyKey] = $strategy($value, $key);
187		}
188	9	if ($discardNull \|\| $discardEmptyContainer) {
189	2	$res = array_filter(
190	2	$res,
191		function ($value) use ($discardNull, $discardEmptyContainer) {
192	2	if (null === $value) {
193	1	return !$discardNull;
194		}
195
196	2	if (is_array($value) && 0 === sizeof($value)) {
197	1	return !$discardEmptyContainer;
198		}
199
200	2	return true;
201	2	}
202		);
203		}
204	9	return $castToObject ? (object)$res : $res;
205	9	};
206		}
207
208		/**
209		* Returns a closure that returns random integer numbers between $MIN and $MAX
210		*
211		* @param int $min
212		* @param null\|int $max
213		* @return \Closure
214		*/
215		function random($min = 0, $max = null)
216		{
217	5	if (null === $max) {
218	1	$max = getrandmax();
219		}
220
221		return function () use ($min, $max) {
222	5	return rand($min, $max);
223	5	};
224		}
225
226		/**
227		* Returns a closure that returns either the class name, given an object, or otherwise the type
228		*
229		* @param null\|string\|\Closure $strategy
230		* @return \Closure
231		*/
232		function type($strategy = null)
233		{
234	6	$strategy = conversions\mixed_to_value_getter($strategy);
235		return function ($value) use ($strategy) {
236	6	$value = $strategy($value);
237	6	return is_object($value) ? get_class($value) : gettype($value);
238	6	};
239		}
240
241		/**
242		* Returns a closure that calls the mapping on each element once.
243		*
244		* > $compute = function ($value, $key) {
245		* > return 'some expensive computation result';
246		* > };
247		* > $list = iter\iterable([['id' => 42, ...], ['id' => 43, ...], ['id' => 42, ...]]);
248		* > $list->map(cache($compute, 'id'));
249		* [
250		* $compute(['id' => 42, ...]), // <-- calls the $compute method
251		* $compute(['id' => 43, ...]), // <-- calls the $compute method
252		* $compute(['id' => 42, ...]) // <-- does not call, instead, populates with cached values
253		* ]
254		*
255		* @param null\|string\|\Closure $mapping
256		* @param null\|string\|\Closure $strategy
257		* @return \Closure
258		*/
259		function cache($mapping, $strategy = null)
260		{
261	2	$mapping = conversions\mixed_to_value_getter($mapping);
262	2	$strategy = conversions\mixed_to_value_getter($strategy);
263	2	$cache = [];
264		return function ($value, $key = null) use ($mapping, $strategy, &$cache) {
265	2	$cacheKey = \json_encode($strategy($value, $key));
266	2	if (!array_key_exists($cacheKey, $cache)) {
267	2	$cache[$cacheKey] = $mapping($value, $key);
268		}
269	2	return $cache[$cacheKey];
270	2	};
271		}
272
273		/**
274		* Returns a mapping closure
275		*
276		* @param string $name
277		* @return \Closure
278		* @throws \InvalidArgumentException
279		*
280		* @deprecated please use the mapping functions directly, will be removed in version 3.0
281		*/
282		function get_mapping($name /* [argument, [arguments, ...] */)
283		{
284		if (is_string($name)) {
285		switch ($name) {
286		case 'ltrim':
287		case 'lstrip':
288		return call_user_func_array('\Zicht\Itertools\mappings\lstrip', array_slice(func_get_args(), 1));
289
290		case 'rtrim':
291		case 'rstrip':
292		return call_user_func_array('\Zicht\Itertools\mappings\rstrip', array_slice(func_get_args(), 1));
293
294		case 'trim':
295		case 'strip':
296		return call_user_func_array('\Zicht\Itertools\mappings\strip', array_slice(func_get_args(), 1));
297
298		case 'length':
299		return length();
300
301		case 'key':
302		return key();
303
304		case 'select':
305		return call_user_func_array('\Zicht\Itertools\mappings\select', array_slice(func_get_args(), 1));
306
307		case 'random':
308		return call_user_func_array('\Zicht\Itertools\mappings\random', array_slice(func_get_args(), 1));
309
310		case 'type':
311		return call_user_func_array('\Zicht\Itertools\mappings\type', array_slice(func_get_args(), 1));
312		}
313		}
314
315		throw new \InvalidArgumentException(sprintf('$NAME "%s" is not a valid mapping.', $name));
316		}
317
318		/**
319		* @param string $name
320		* @return \Closure
321		* @throws \InvalidArgumentException
322		*
323		* @deprecated please use the mapping functions directly, will be removed in version 3.0
324		*/
325		function getMapping($name /* [argument, [arguments, ...] */) // phpcs:ignore Zicht.NamingConventions.Functions.GlobalNaming
		0 ignored issues – show Unused Code introduced 2018-10-26 11:54 UTC by Report Bug Copy Issue Report The parameter `$name` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
326		{
327		return call_user_func_array('\Zicht\Itertools\mappings\get_mapping', func_get_args());
328		}
329

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mappings.php ➔ cache() A

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