Mappings::select() - Code Metrics - Inspection of "Merge pull request #64 from zicht/feature/prepare-..." - zicht/itertools - Measure and Improve Code Quality continuously with Scrutinizer

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created 2021-03-29 13:09 UTC

Mappings::select() B

↳ Parent: Mappings

Complexity

Conditions	8
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	19
CRAP Score	8

Importance

Changes

Metric	Value
cc	8
nc	1
nop	4
dl	0
loc	31
rs	8.1795
c	0
b	0
f	0
ccs	19
cts	19
cp	1
crap	8

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

namespace Zicht\Itertools\util;

class Mappings
{
    /**
     * Returns a closure that strips any matching $chars from the left of the input string
     *
     * @param string $chars
     * @return \Closure
     */
    public static function lstrip($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 $chars
     * @return \Closure
     */
    public static function rstrip($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 $chars
     * @return \Closure
     */
    public static function strip($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
     */
    public static 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
     */
    public static function key()
    {
        return function ($value, $key) {
            return $key;
        };
    }

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

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

    /**
     * Returns a closure that returns the value cast to a string
     *
     * @return \Closure
     */
    public static 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 $depth
     * @return \Closure
     */
    public static function jsonEncode($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 $associative
     * @param int $options
     * @param int $depth
     * @return \Closure
     */
    public static function jsonDecode($associative = false, $options = 0, $depth = 512)
    {
        return function ($value) use ($associative, $options, $depth) {
            return \json_decode($value, $associative, $depth, $options);
        };
    }

    /**
     * Returns a closure that applies multiple mappings to the value and returns the results
     *
     * > $compute = function ($value, $key) {
     * >    return 'some computation result';
     * > };
     * > $list = iterable([new Data(1), new Data(2), new Data(3)]);
     * > $list->map(Mappings::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 $discardEmptyContainer
     * @return \Closure
     */
    public static function select($mappings, $strategy = null, $discardNull = false, $discardEmptyContainer = false)
    {
        $castToObject = is_object($mappings);
        $mappings = array_map('\Zicht\Itertools\util\Conversions::mixedToValueGetter', (array)$mappings);
        $strategy = Conversions::mixedToValueGetter($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 $max
     * @return \Closure
     */
    public static function random($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 $strategy
     * @return \Closure
     */
    public static function type($strategy = null)
    {
        $strategy = Conversions::mixedToValueGetter($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 = iterable([['id' => 42, ...], ['id' => 43, ...], ['id' => 42, ...]]);
     * > $list->map(Mappings::cache($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 $strategy
     * @return \Closure
     */
    public static function cache($mapping, $strategy = null)
    {
        $mapping = Conversions::mixedToValueGetter($mapping);
        $strategy = Conversions::mixedToValueGetter($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 closure that returns the same value every time it is called.
     *
     * @param null|string|int|float|bool|object|array $value
     * @return \Closure
     */
    public static function constant($value)
    {
        return function () use ($value) {
            return $value;
        };
    }

    /**
     * @param string $name
     * @return \Closure
     * @deprecated will be removed in version 3.0
     */
    public static function getMapping($name /* [argument, [arguments, ...] */)
    {
        switch ($name) {
            case 'ltrim':
            case 'lstrip':
                return call_user_func_array('\Zicht\Itertools\util\Mappings::lstrip', array_slice(func_get_args(), 1));

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

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

            case 'length':
                return call_user_func_array('\Zicht\Itertools\util\Mappings::length', array_slice(func_get_args(), 1));

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


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

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