Util::arrayMapMethod() - Code Metrics - Inspection of "Merge branch 'feature/784_Internet_radio'" - owncloud/music - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 49e88e...27428c )

by Pauli

created 2021-01-26 20:21 UTC

Util::arrayMapMethod() A

↳ Parent: Util

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	3
c	0
b	0
f	0
nc	1
nop	2
dl	0
loc	5
rs	10

<?php declare(strict_types=1);

/**
 * ownCloud - Music app
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Pauli Järvinen <[email protected]>
 * @copyright Pauli Järvinen 2018 - 2020
 */

namespace OCA\Music\Utility;

use \OCP\Files\Folder;

/**
 * Miscellaneous static utility functions
 */
class Util {

	/**
	 * Map the given array by calling a named member function for each of the array elements
	 */
	public static function arrayMapMethod(array $arr, string $methodName) : array {
		$func = function ($obj) use ($methodName) {
			return $obj->$methodName();
		};
		return \array_map($func, $arr);
	}

	/**
	 * Extract ID of each array element by calling getId and return
	 * the IDs as an array
	 */
	public static function extractIds(array $arr) : array {
		return self::arrayMapMethod($arr, 'getId');
	}

	/**
	 * Extract User ID of each array element by calling getUserId and return
	 * the IDs as an array
	 */
	public static function extractUserIds(array $arr) : array {
		return self::arrayMapMethod($arr, 'getUserId');
	}

	/**
	 * Create look-up table from given array of items which have a `getId` function.
	 * @return array where keys are the values returned by `getId` of each item
	 */
	public static function createIdLookupTable(array $array) : array {
		$lut = [];
		foreach ($array as $item) {
			$lut[$item->getId()] = $item;
		}
		return $lut;
	}

	/**
	 * Get difference of two arrays, i.e. elements belonging to $b but not $a.
	 * This function is faster than the built-in array_diff for large arrays but
	 * at the expense of higher RAM usage and can be used only for arrays of
	 * integers or strings.
	 * From https://stackoverflow.com/a/8827033
	 */
	public static function arrayDiff(array $b, array $a) : array {
		$at = \array_flip($a);
		$d = [];
		foreach ($b as $i) {
			if (!isset($at[$i])) {
				$d[] = $i;
			}
		}
		return $d;
	}

	/**
	 * Get multiple items from @a $array, as indicated by a second array @a $indices.
	 */
	public static function arrayMultiGet(array $array, array $indices) : array {
		$result = [];
		foreach ($indices as $index) {
			$result[] = $array[$index];
		}
		return $result;
	}

	/**
	 * Convert the given array $arr so that keys of the potentially multi-dimensional array
	 * are converted using the mapping given in $dictionary. Keys not found from $dictionary
	 * are not altered.
	 */
	public static function convertArrayKeys(array $arr, array $dictionary) : array {
		$newArr = [];

		foreach ($arr as $k => $v) {
			$key = $dictionary[$k] ?? $k;
			$newArr[$key] = \is_array($v) ? self::convertArrayKeys($v, $dictionary) : $v;
		}

		return $newArr;
	}

	/**
	 * Walk through the given, potentially multi-dimensional, array and cast all leaf nodes
	 * to integer type. The array is modified in-place.
	 */
	public static function intCastArrayValues(array $arr) : void {
		\array_walk_recursive($arr, function(&$value) {
			$value = \intval($value);
		});
	}

	/**
	 * Like the built-in \explode(...) function but this one can be safely called with
	 * null string, and no warning will be emitted. Also, this returns an empty array from
	 * null and '' inputs while the built-in alternative returns a 1-item array containing
	 * an empty string.
	 * @param string $delimiter
	 * @param string|null $string
	 * @return array
	 */
	public static function explode(string $delimiter, ?string $string) : array {
		if ($string === null || $string === '') {
			return [];
		} else {
			return \explode($delimiter, $string);
		}
	}

	/**
	 * Truncate the given string to maximum length, appendig ellipsis character
	 * if the truncation happened. Also null argument may be safely passed and
	 * it remains unaltered.
	 */
	public static function truncate(?string $string, int $maxLength) : ?string {
		if ($string === null) {
			return null;
		} else {
			return \mb_strimwidth($string, 0, $maxLength, "\u{2026}");
		}
	}

	/**
	 * Test if given string starts with another given string
	 */
	public static function startsWith(string $string, string $potentialStart, bool $ignoreCase=false) : bool {
		$actualStart = \substr($string, 0, \strlen($potentialStart));
		if ($ignoreCase) {
			$actualStart= \mb_strtolower($actualStart);
			$potentialStart= \mb_strtolower($potentialStart);
		}
		return $actualStart === $potentialStart;
	}

	/**
	 * Test if given string ends with another given string
	 */
	public static function endsWith(string $string, string $potentialEnd, bool $ignoreCase=false) : bool {
		$actualEnd = \substr($string, -\strlen($potentialEnd));
		if ($ignoreCase) {
			$actualEnd = \mb_strtolower($actualEnd);
			$potentialEnd = \mb_strtolower($potentialEnd);
		}
		return $actualEnd === $potentialEnd;
	}

	/**
	 * Multi-byte safe case-insensitive string comparison
	 * @return int < 0 if $a is less than $b; > 0 if $a is greater than $b, and 0 if they are equal.
	 */
	public static function stringCaseCompare(?string $a, ?string $b) : int {
		return \strcmp(\mb_strtolower($a ?? ''), \mb_strtolower($b ?? ''));
	}
	
	/**
	 * Test if $item is a string and not empty or only consisting of whitespace
	 */
	public static function isNonEmptyString(/*mixed*/ $item) : bool {
		return \is_string($item) && \trim($item) !== '';
	}

	/**
	 * Convert file size given in bytes to human-readable format
	 */
	public static function formatFileSize(int $bytes, int $decimals = 1) : string {
		$units = 'BKMGTP';
		$factor = \floor((\strlen($bytes) - 1) / 3);
		return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . @$units[(int)$factor];
	}

	/**
	 * Get a Folder object using a parent Folder object and a relative path
	 */
	public static function getFolderFromRelativePath(Folder $parentFolder, string $relativePath) : Folder {
		if ($relativePath !== null && $relativePath !== '/' && $relativePath !== '') {
			$node = $parentFolder->get($relativePath);
			if ($node instanceof Folder) {
				return $node;
			} else {
				throw new \InvalidArgumentException('Path points to a file while folder expected');
			}
		} else {
			return $parentFolder;
		}
	}

	/**
	 * Create relative path from the given working dir (CWD) to the given target path
	 * @param string $cwdPath Absolute CWD path
	 * @param string $targetPath Absolute target path
	 */
	public static function relativePath(string $cwdPath, string $targetPath) : string {
		$cwdParts = \explode('/', $cwdPath);
		$targetParts = \explode('/', $targetPath);

		// remove the common prefix of the paths
		while (\count($cwdParts) > 0 && \count($targetParts) > 0 && $cwdParts[0] === $targetParts[0]) {
			\array_shift($cwdParts);
			\array_shift($targetParts);
		}

		// prepend up-navigation from CWD to the closest common parent folder with the target
		for ($i = 0, $count = \count($cwdParts); $i < $count; ++$i) {
			\array_unshift($targetParts, '..');
		}

		return \implode('/', $targetParts);
	}

	/**
	 * Given a current working directory path (CWD) and a relative path (possibly containing '..' parts),
	 * form an absolute path matching the relative path. This is a reverse operation for Util::relativePath().
	 */
	public static function resolveRelativePath(string $cwdPath, string $relativePath) : string {
		$cwdParts = \explode('/', $cwdPath);
		$relativeParts = \explode('/', $relativePath);

		// get rid of the trailing empty part of CWD which appears when CWD has a trailing '/'
		if ($cwdParts[\count($cwdParts)-1] === '') {
			\array_pop($cwdParts);
		}

		foreach ($relativeParts as $part) {
			if ($part === '..') {
				\array_pop($cwdParts);
			} else {
				\array_push($cwdParts, $part);
			}
		}

		return \implode('/', $cwdParts);
	}

	/**
	 * Encode a file path so that it can be used as part of a WebDAV URL
	 */
	public static function urlEncodePath(string $path) : string {
		// URL encode each part of the file path
		return \join('/', \array_map('rawurlencode', \explode('/', $path)));
	}

	/**
	 * Swap values of two variables in place
	 * @param mixed $a
	 * @param mixed $b
	 */
	public static function swap(&$a, &$b) : void {
		$temp = $a;
		$a = $b;
		$b = $temp;
	}
}


1			<?php declare(strict_types=1);
2
3			/**
4			* ownCloud - Music app
5			*
6			* This file is licensed under the Affero General Public License version 3 or
7			* later. See the COPYING file.
8			*
9			* @author Pauli Järvinen <[email protected]>
10			* @copyright Pauli Järvinen 2018 - 2020
11			*/
12
13			namespace OCA\Music\Utility;
14
15			use \OCP\Files\Folder;
16
17			/**
18			* Miscellaneous static utility functions
19			*/
20			class Util {
21
22			/**
23			* Map the given array by calling a named member function for each of the array elements
24			*/
25			public static function arrayMapMethod(array $arr, string $methodName) : array {
26			$func = function ($obj) use ($methodName) {
27			return $obj->$methodName();
28			};
29			return \array_map($func, $arr);
30			}
31
32			/**
33			* Extract ID of each array element by calling getId and return
34			* the IDs as an array
35			*/
36			public static function extractIds(array $arr) : array {
37			return self::arrayMapMethod($arr, 'getId');
38			}
39
40			/**
41			* Extract User ID of each array element by calling getUserId and return
42			* the IDs as an array
43			*/
44			public static function extractUserIds(array $arr) : array {
45			return self::arrayMapMethod($arr, 'getUserId');
46			}
47
48			/**
49			* Create look-up table from given array of items which have a `getId` function.
50			* @return array where keys are the values returned by `getId` of each item
51			*/
52			public static function createIdLookupTable(array $array) : array {
53			$lut = [];
54			foreach ($array as $item) {
55			$lut[$item->getId()] = $item;
56			}
57			return $lut;
58			}
59
60			/**
61			* Get difference of two arrays, i.e. elements belonging to $b but not $a.
62			* This function is faster than the built-in array_diff for large arrays but
63			* at the expense of higher RAM usage and can be used only for arrays of
64			* integers or strings.
65			* From https://stackoverflow.com/a/8827033
66			*/
67			public static function arrayDiff(array $b, array $a) : array {
68			$at = \array_flip($a);
69			$d = [];
70			foreach ($b as $i) {
71			if (!isset($at[$i])) {
72			$d[] = $i;
73			}
74			}
75			return $d;
76			}
77
78			/**
79			* Get multiple items from @a $array, as indicated by a second array @a $indices.
80			*/
81			public static function arrayMultiGet(array $array, array $indices) : array {
82			$result = [];
83			foreach ($indices as $index) {
84			$result[] = $array[$index];
85			}
86			return $result;
87			}
88
89			/**
90			* Convert the given array $arr so that keys of the potentially multi-dimensional array
91			* are converted using the mapping given in $dictionary. Keys not found from $dictionary
92			* are not altered.
93			*/
94			public static function convertArrayKeys(array $arr, array $dictionary) : array {
95			$newArr = [];
96
97			foreach ($arr as $k => $v) {
98			$key = $dictionary[$k] ?? $k;
99			$newArr[$key] = \is_array($v) ? self::convertArrayKeys($v, $dictionary) : $v;
100			}
101
102			return $newArr;
103			}
104
105			/**
106			* Walk through the given, potentially multi-dimensional, array and cast all leaf nodes
107			* to integer type. The array is modified in-place.
108			*/
109			public static function intCastArrayValues(array $arr) : void {
110			\array_walk_recursive($arr, function(&$value) {
111			$value = \intval($value);
112			});
113			}
114
115			/**
116			* Like the built-in \explode(...) function but this one can be safely called with
117			* null string, and no warning will be emitted. Also, this returns an empty array from
118			* null and '' inputs while the built-in alternative returns a 1-item array containing
119			* an empty string.
120			* @param string $delimiter
121			* @param string\|null $string
122			* @return array
123			*/
124			public static function explode(string $delimiter, ?string $string) : array {
125			if ($string === null \|\| $string === '') {
126			return [];
127			} else {
128			return \explode($delimiter, $string);
129			}
130			}
131
132			/**
133			* Truncate the given string to maximum length, appendig ellipsis character
134			* if the truncation happened. Also null argument may be safely passed and
135			* it remains unaltered.
136			*/
137			public static function truncate(?string $string, int $maxLength) : ?string {
138			if ($string === null) {
139			return null;
140			} else {
141			return \mb_strimwidth($string, 0, $maxLength, "\u{2026}");
142			}
143			}
144
145			/**
146			* Test if given string starts with another given string
147			*/
148			public static function startsWith(string $string, string $potentialStart, bool $ignoreCase=false) : bool {
149			$actualStart = \substr($string, 0, \strlen($potentialStart));
150			if ($ignoreCase) {
151			$actualStart= \mb_strtolower($actualStart);
152			$potentialStart= \mb_strtolower($potentialStart);
153			}
154			return $actualStart === $potentialStart;
155			}
156
157			/**
158			* Test if given string ends with another given string
159			*/
160			public static function endsWith(string $string, string $potentialEnd, bool $ignoreCase=false) : bool {
161			$actualEnd = \substr($string, -\strlen($potentialEnd));
162			if ($ignoreCase) {
163			$actualEnd = \mb_strtolower($actualEnd);
164			$potentialEnd = \mb_strtolower($potentialEnd);
165			}
166			return $actualEnd === $potentialEnd;
167			}
168
169			/**
170			* Multi-byte safe case-insensitive string comparison
171			* @return int < 0 if $a is less than $b; > 0 if $a is greater than $b, and 0 if they are equal.
172			*/
173			public static function stringCaseCompare(?string $a, ?string $b) : int {
174			return \strcmp(\mb_strtolower($a ?? ''), \mb_strtolower($b ?? ''));
175			}
176
177			/**
178			* Test if $item is a string and not empty or only consisting of whitespace
179			*/
180			public static function isNonEmptyString(/mixed/ $item) : bool {
181			return \is_string($item) && \trim($item) !== '';
182			}
183
184			/**
185			* Convert file size given in bytes to human-readable format
186			*/
187			public static function formatFileSize(int $bytes, int $decimals = 1) : string {
188			$units = 'BKMGTP';
189			$factor = \floor((\strlen($bytes) - 1) / 3);
190			return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . @$units[(int)$factor];
191			}
192
193			/**
194			* Get a Folder object using a parent Folder object and a relative path
195			*/
196			public static function getFolderFromRelativePath(Folder $parentFolder, string $relativePath) : Folder {
197			if ($relativePath !== null && $relativePath !== '/' && $relativePath !== '') {
198			$node = $parentFolder->get($relativePath);
199			if ($node instanceof Folder) {
200			return $node;
201			} else {
202			throw new \InvalidArgumentException('Path points to a file while folder expected');
203			}
204			} else {
205			return $parentFolder;
206			}
207			}
208
209			/**
210			* Create relative path from the given working dir (CWD) to the given target path
211			* @param string $cwdPath Absolute CWD path
212			* @param string $targetPath Absolute target path
213			*/
214			public static function relativePath(string $cwdPath, string $targetPath) : string {
215			$cwdParts = \explode('/', $cwdPath);
216			$targetParts = \explode('/', $targetPath);
217
218			// remove the common prefix of the paths
219			while (\count($cwdParts) > 0 && \count($targetParts) > 0 && $cwdParts[0] === $targetParts[0]) {
220			\array_shift($cwdParts);
221			\array_shift($targetParts);
222			}
223
224			// prepend up-navigation from CWD to the closest common parent folder with the target
225			for ($i = 0, $count = \count($cwdParts); $i < $count; ++$i) {
226			\array_unshift($targetParts, '..');
227			}
228
229			return \implode('/', $targetParts);
230			}
231
232			/**
233			* Given a current working directory path (CWD) and a relative path (possibly containing '..' parts),
234			* form an absolute path matching the relative path. This is a reverse operation for Util::relativePath().
235			*/
236			public static function resolveRelativePath(string $cwdPath, string $relativePath) : string {
237			$cwdParts = \explode('/', $cwdPath);
238			$relativeParts = \explode('/', $relativePath);
239
240			// get rid of the trailing empty part of CWD which appears when CWD has a trailing '/'
241			if ($cwdParts[\count($cwdParts)-1] === '') {
242			\array_pop($cwdParts);
243			}
244
245			foreach ($relativeParts as $part) {
246			if ($part === '..') {
247			\array_pop($cwdParts);
248			} else {
249			\array_push($cwdParts, $part);
250			}
251			}
252
253			return \implode('/', $cwdParts);
254			}
255
256			/**
257			* Encode a file path so that it can be used as part of a WebDAV URL
258			*/
259			public static function urlEncodePath(string $path) : string {
260			// URL encode each part of the file path
261			return \join('/', \array_map('rawurlencode', \explode('/', $path)));
262			}
263
264			/**
265			* Swap values of two variables in place
266			* @param mixed $a
267			* @param mixed $b
268			*/
269			public static function swap(&$a, &$b) : void {
270			$temp = $a;
271			$a = $b;
272			$b = $temp;
273			}
274			}
275

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Util::arrayMapMethod() A

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