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by Pauli

created 2022-08-01 20:51 UTC

Util::arraySortByColumn() A

↳ Parent: Util

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	2
c	0
b	0
f	0
nc	1
nop	2
dl	0
loc	3
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 - 2021
 */

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 $methodArgs=[]) : array {
		$func = function ($obj) use ($methodName, $methodArgs) {
			return \call_user_func_array([$obj, $methodName], $methodArgs);
		};
		return \array_map($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;
	}

	/**
	 * Like the built-in function \array_filter but this one works recursively on nested arrays.
	 * Another difference is that this function always requires an explicit callback condition.
	 * Both inner nodes and leafs nodes are passed to the $condition.
	 */
	public static function arrayFilterRecursive(array  $array, callable $condition) : array {
		$result = [];

		foreach ($array as $key => $value) {
			if ($condition($value)) {
				if (\is_array($value)) {
					$result[$key] = self::arrayFilterRecursive($value, $condition);
				} else {
					$result[$key] = $value;
				}
			}
		}

		return $result;
	}

	/**
	 * Inverse operation of self::arrayFilterRecursive, keeping only those items where
	 * the $condition evaluates to *false*.
	 */
	public static function arrayRejectRecursive(array $array, callable $condition) : array {
		$invCond = function($item) use ($condition) {
			return !$condition($item);
		};
		return self::arrayFilterRecursive($array, $invCond);
	}

	/**
	 * 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);
		});
	}

	/**
	 * Given a two-dimensional array, sort the outer dimension according to values in the
	 * specified column of the inner dimension.
	 */
	public static function arraySortByColumn(array &$arr, string $column) : void {
		\usort($arr, function ($a, $b) use ($column) {
			return self::stringCaseCompare($a[$column], $b[$column]);
		});
	}

	/**
	 * 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 $string) : array {
		if ($delimiter === '') {
			throw new \UnexpectedValueException();
		} elseif ($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 negative value if $a is less than $b, positive value 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 $decimals = 1) : ?string {
		if ($bytes === null) {
			return null;
		} else {
			$units = 'BKMGTP';
			$factor = \floor((\strlen((string)$bytes) - 1) / 3);
			return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . @$units[(int)$factor];
		}
	}

	/**
	 * Convert time given as seconds to the HH:MM:SS format
	 */
	public static function formatTime(?int $seconds) : ?string {
		if ($seconds === null) {
			return null;
		} else {
			return \sprintf('%02d:%02d:%02d', ($seconds/3600), ($seconds/60%60), $seconds%60);
		}
	}

	/**
	 * Convert date and time given in the SQL format to the ISO UTC "Zulu format" e.g. "2021-08-19T19:33:15Z"
	 */
	public static function formatZuluDateTime(?string $dbDateString) : ?string {
		if ($dbDateString === null) {
			return null;
		} else {
			$dateTime = new \DateTime($dbDateString);
			return $dateTime->format('Y-m-d\TH:i:s.v\Z');
		}
	}

	/**
	 * Convert date and time given in the SQL format to the ISO UTC "offset format" e.g. "2021-08-19T19:33:15+00:00"
	 */
	public static function formatDateTimeUtcOffset(?string $dbDateString) : ?string {
		if ($dbDateString === null) {
			return null;
		} else {
			$dateTime = new \DateTime($dbDateString);
			return $dateTime->format('c');
		}
	}

	/**
	 * 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)));
	}

	/**
	 * Compose URL from parts as returned by the system function parse_url.
	 * From https://stackoverflow.com/a/35207936
	 */
	public static function buildUrl(array $parts) : string {
		return (isset($parts['scheme']) ? "{$parts['scheme']}:" : '') .
				((isset($parts['user']) || isset($parts['host'])) ? '//' : '') .
				(isset($parts['user']) ? "{$parts['user']}" : '') .
				(isset($parts['pass']) ? ":{$parts['pass']}" : '') .
				(isset($parts['user']) ? '@' : '') .
				(isset($parts['host']) ? "{$parts['host']}" : '') .
				(isset($parts['port']) ? ":{$parts['port']}" : '') .
				(isset($parts['path']) ? "{$parts['path']}" : '') .
				(isset($parts['query']) ? "?{$parts['query']}" : '') .
				(isset($parts['fragment']) ? "#{$parts['fragment']}" : '');
	}

	/**
	 * 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 - 2021
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 $methodArgs=[]) : array {
26			$func = function ($obj) use ($methodName, $methodArgs) {
27			return \call_user_func_array([$obj, $methodName], $methodArgs);
28			};
29			return \array_map($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			* Like the built-in function \array_filter but this one works recursively on nested arrays.
91			* Another difference is that this function always requires an explicit callback condition.
92			* Both inner nodes and leafs nodes are passed to the $condition.
93			*/
94			public static function arrayFilterRecursive(array $array, callable $condition) : array {
95			$result = [];
96
97			foreach ($array as $key => $value) {
98			if ($condition($value)) {
99			if (\is_array($value)) {
100			$result[$key] = self::arrayFilterRecursive($value, $condition);
101			} else {
102			$result[$key] = $value;
103			}
104			}
105			}
106
107			return $result;
108			}
109
110			/**
111			* Inverse operation of self::arrayFilterRecursive, keeping only those items where
112			* the $condition evaluates to false.
113			*/
114			public static function arrayRejectRecursive(array $array, callable $condition) : array {
115			$invCond = function($item) use ($condition) {
116			return !$condition($item);
117			};
118			return self::arrayFilterRecursive($array, $invCond);
119			}
120
121			/**
122			* Convert the given array $arr so that keys of the potentially multi-dimensional array
123			* are converted using the mapping given in $dictionary. Keys not found from $dictionary
124			* are not altered.
125			*/
126			public static function convertArrayKeys(array $arr, array $dictionary) : array {
127			$newArr = [];
128
129			foreach ($arr as $k => $v) {
130			$key = $dictionary[$k] ?? $k;
131			$newArr[$key] = \is_array($v) ? self::convertArrayKeys($v, $dictionary) : $v;
132			}
133
134			return $newArr;
135			}
136
137			/**
138			* Walk through the given, potentially multi-dimensional, array and cast all leaf nodes
139			* to integer type. The array is modified in-place.
140			*/
141			public static function intCastArrayValues(array $arr) : void {
142			\array_walk_recursive($arr, function(&$value) {
143			$value = \intval($value);
144			});
145			}
146
147			/**
148			* Given a two-dimensional array, sort the outer dimension according to values in the
149			* specified column of the inner dimension.
150			*/
151			public static function arraySortByColumn(array &$arr, string $column) : void {
152			\usort($arr, function ($a, $b) use ($column) {
153			return self::stringCaseCompare($a[$column], $b[$column]);
154			});
155			}
156
157			/**
158			* Like the built-in \explode(...) function but this one can be safely called with
159			* null string, and no warning will be emitted. Also, this returns an empty array from
160			* null and '' inputs while the built-in alternative returns a 1-item array containing
161			* an empty string.
162			* @param string $delimiter
163			* @param string\|null $string
164			* @return array
165			*/
166			public static function explode(string $delimiter, ?string $string) : array {
167			if ($delimiter === '') {
168			throw new \UnexpectedValueException();
169			} elseif ($string === null \|\| $string === '') {
170			return [];
171			} else {
172			return \explode($delimiter, $string);
173			}
174			}
175
176			/**
177			* Truncate the given string to maximum length, appendig ellipsis character
178			* if the truncation happened. Also null argument may be safely passed and
179			* it remains unaltered.
180			*/
181			public static function truncate(?string $string, int $maxLength) : ?string {
182			if ($string === null) {
183			return null;
184			} else {
185			return \mb_strimwidth($string, 0, $maxLength, "\u{2026}");
186			}
187			}
188
189			/**
190			* Test if given string starts with another given string
191			*/
192			public static function startsWith(string $string, string $potentialStart, bool $ignoreCase=false) : bool {
193			$actualStart = \substr($string, 0, \strlen($potentialStart));
194			if ($ignoreCase) {
195			$actualStart = \mb_strtolower($actualStart);
196			$potentialStart = \mb_strtolower($potentialStart);
197			}
198			return $actualStart === $potentialStart;
199			}
200
201			/**
202			* Test if given string ends with another given string
203			*/
204			public static function endsWith(string $string, string $potentialEnd, bool $ignoreCase=false) : bool {
205			$actualEnd = \substr($string, -\strlen($potentialEnd));
206			if ($ignoreCase) {
207			$actualEnd = \mb_strtolower($actualEnd);
208			$potentialEnd = \mb_strtolower($potentialEnd);
209			}
210			return $actualEnd === $potentialEnd;
211			}
212
213			/**
214			* Multi-byte safe case-insensitive string comparison
215			* @return int negative value if $a is less than $b, positive value if $a is greater than $b, and 0 if they are equal.
216			*/
217			public static function stringCaseCompare(?string $a, ?string $b) : int {
218			return \strcmp(\mb_strtolower($a ?? ''), \mb_strtolower($b ?? ''));
219			}
220
221			/**
222			* Test if $item is a string and not empty or only consisting of whitespace
223			*/
224			public static function isNonEmptyString(/mixed/ $item) : bool {
225			return \is_string($item) && \trim($item) !== '';
226			}
227
228			/**
229			* Convert file size given in bytes to human-readable format
230			*/
231			public static function formatFileSize(?int $bytes, int $decimals = 1) : ?string {
232			if ($bytes === null) {
233			return null;
234			} else {
235			$units = 'BKMGTP';
236			$factor = \floor((\strlen((string)$bytes) - 1) / 3);
237			return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . @$units[(int)$factor];
238			}
239			}
240
241			/**
242			* Convert time given as seconds to the HH:MM:SS format
243			*/
244			public static function formatTime(?int $seconds) : ?string {
245			if ($seconds === null) {
246			return null;
247			} else {
248			return \sprintf('%02d:%02d:%02d', ($seconds/3600), ($seconds/60%60), $seconds%60);
249			}
250			}
251
252			/**
253			* Convert date and time given in the SQL format to the ISO UTC "Zulu format" e.g. "2021-08-19T19:33:15Z"
254			*/
255			public static function formatZuluDateTime(?string $dbDateString) : ?string {
256			if ($dbDateString === null) {
257			return null;
258			} else {
259			$dateTime = new \DateTime($dbDateString);
260			return $dateTime->format('Y-m-d\TH:i:s.v\Z');
261			}
262			}
263
264			/**
265			* Convert date and time given in the SQL format to the ISO UTC "offset format" e.g. "2021-08-19T19:33:15+00:00"
266			*/
267			public static function formatDateTimeUtcOffset(?string $dbDateString) : ?string {
268			if ($dbDateString === null) {
269			return null;
270			} else {
271			$dateTime = new \DateTime($dbDateString);
272			return $dateTime->format('c');
273			}
274			}
275
276			/**
277			* Get a Folder object using a parent Folder object and a relative path
278			*/
279			public static function getFolderFromRelativePath(Folder $parentFolder, string $relativePath) : Folder {
280			if ($relativePath !== null && $relativePath !== '/' && $relativePath !== '') {
281			$node = $parentFolder->get($relativePath);
282			if ($node instanceof Folder) {
283			return $node;
284			} else {
285			throw new \InvalidArgumentException('Path points to a file while folder expected');
286			}
287			} else {
288			return $parentFolder;
289			}
290			}
291
292			/**
293			* Create relative path from the given working dir (CWD) to the given target path
294			* @param string $cwdPath Absolute CWD path
295			* @param string $targetPath Absolute target path
296			*/
297			public static function relativePath(string $cwdPath, string $targetPath) : string {
298			$cwdParts = \explode('/', $cwdPath);
299			$targetParts = \explode('/', $targetPath);
300
301			// remove the common prefix of the paths
302			while (\count($cwdParts) > 0 && \count($targetParts) > 0 && $cwdParts[0] === $targetParts[0]) {
303			\array_shift($cwdParts);
304			\array_shift($targetParts);
305			}
306
307			// prepend up-navigation from CWD to the closest common parent folder with the target
308			for ($i = 0, $count = \count($cwdParts); $i < $count; ++$i) {
309			\array_unshift($targetParts, '..');
310			}
311
312			return \implode('/', $targetParts);
313			}
314
315			/**
316			* Given a current working directory path (CWD) and a relative path (possibly containing '..' parts),
317			* form an absolute path matching the relative path. This is a reverse operation for Util::relativePath().
318			*/
319			public static function resolveRelativePath(string $cwdPath, string $relativePath) : string {
320			$cwdParts = \explode('/', $cwdPath);
321			$relativeParts = \explode('/', $relativePath);
322
323			// get rid of the trailing empty part of CWD which appears when CWD has a trailing '/'
324			if ($cwdParts[\count($cwdParts)-1] === '') {
325			\array_pop($cwdParts);
326			}
327
328			foreach ($relativeParts as $part) {
329			if ($part === '..') {
330			\array_pop($cwdParts);
331			} else {
332			\array_push($cwdParts, $part);
333			}
334			}
335
336			return \implode('/', $cwdParts);
337			}
338
339			/**
340			* Encode a file path so that it can be used as part of a WebDAV URL
341			*/
342			public static function urlEncodePath(string $path) : string {
343			// URL encode each part of the file path
344			return \join('/', \array_map('rawurlencode', \explode('/', $path)));
345			}
346
347			/**
348			* Compose URL from parts as returned by the system function parse_url.
349			* From https://stackoverflow.com/a/35207936
350			*/
351			public static function buildUrl(array $parts) : string {
352			return (isset($parts['scheme']) ? "{$parts['scheme']}:" : '') .
353			((isset($parts['user']) \|\| isset($parts['host'])) ? '//' : '') .
354			(isset($parts['user']) ? "{$parts['user']}" : '') .
355			(isset($parts['pass']) ? ":{$parts['pass']}" : '') .
356			(isset($parts['user']) ? '@' : '') .
357			(isset($parts['host']) ? "{$parts['host']}" : '') .
358			(isset($parts['port']) ? ":{$parts['port']}" : '') .
359			(isset($parts['path']) ? "{$parts['path']}" : '') .
360			(isset($parts['query']) ? "?{$parts['query']}" : '') .
361			(isset($parts['fragment']) ? "#{$parts['fragment']}" : '');
362			}
363
364			/**
365			* Swap values of two variables in place
366			* @param mixed $a
367			* @param mixed $b
368			*/
369			public static function swap(&$a, &$b) : void {
370			$temp = $a;
371			$a = $b;
372			$b = $temp;
373			}
374			}
375

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