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<?php |
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namespace dokuwiki\Utf8; |
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/** |
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* DokuWiki sort functions |
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* |
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* When "intl" extension is available, all sorts are done using a collator. |
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* Otherwise, primitive PHP functions are called. |
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* |
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* The collator is created using the locale given in $conf['lang']. |
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* It always uses case insensitive "natural" ordering in its collation. |
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* The fallback solution uses the primitive PHP functions that return almost the same results |
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* when the input is text with only [A-Za-z0-9] characters. |
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* |
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* @license GPL 2 (http://www.gnu.org/licenses/gpl.html) |
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* @author Moisés Braga Ribeiro <[email protected]> |
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* @author Andreas Gohr <[email protected]> |
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*/ |
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class Sort |
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{ |
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/** @var \Collator[] language specific collators, usually only one */ |
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protected static $collators = []; |
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/** @var bool should the intl extension be used if available? For testing only */ |
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protected static $useIntl = true; |
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/** |
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* Initialization of a collator using $conf['lang'] as the locale. |
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* The initialization is done only once. |
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* The collation takes "natural ordering" into account, that is, "page 2" is before "page 10". |
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* |
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* @return \Collator Returns a configured collator or null if the collator cannot be created. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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*/ |
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protected static function getCollator() |
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{ |
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global $conf; |
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$lc = $conf['lang']; |
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// check if intl extension is available |
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if (!self::$useIntl || !class_exists('\Collator')) { |
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return null; |
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} |
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// load collator if not available yet |
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if (!isset(self::$collators[$lc])) { |
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$collator = \Collator::create($lc); |
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if (!isset($collator)) return null; // check needed as stated in the docs |
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$collator->setAttribute(\Collator::NUMERIC_COLLATION, \Collator::ON); |
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dbglog('Collator created with locale "' . $lc . '": numeric collation on, ' . |
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'valid locale "' . $collator->getLocale(\Locale::VALID_LOCALE) . '", ' . |
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'actual locale "' . $collator->getLocale(\Locale::ACTUAL_LOCALE) . '"'); |
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self::$collators[$lc] = $collator; |
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} |
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return self::$collators[$lc]; |
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} |
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/** |
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* Enable or disable the use of the "intl" extension collator. |
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* This is used for testing and should not be used in normal code. |
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* |
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* @param bool $use |
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* |
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* @author Andreas Gohr <[email protected]> |
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*/ |
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public static function useIntl($use = true) |
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{ |
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self::$useIntl = $use; |
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} |
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/** |
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* Drop-in replacement for strcmp(), strcasecmp(), strnatcmp() and strnatcasecmp(). |
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* It uses a collator-based comparison, or strnatcasecmp() as a fallback. |
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* |
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* @param string $str1 The first string. |
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* @param string $str2 The second string. |
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* @return int Returns < 0 if $str1 is less than $str2; > 0 if $str1 is greater than $str2, and 0 if they are equal. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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*/ |
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public static function strcmp($str1, $str2) |
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{ |
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$collator = self::getCollator(); |
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if (isset($collator)) { |
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return $collator->compare($str1, $str2); |
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} else { |
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return strnatcasecmp($str1, $str2); |
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} |
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} |
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/** |
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* Drop-in replacement for sort(). |
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* It uses a collator-based sort, or sort() with flags SORT_NATURAL and SORT_FLAG_CASE as a fallback. |
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* |
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* @param array $array The input array. |
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* @return bool Returns true on success or false on failure. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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*/ |
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public static function sort(&$array) |
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{ |
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$collator = self::getCollator(); |
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if (isset($collator)) { |
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return $collator->sort($array); |
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} else { |
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return sort($array, SORT_NATURAL | SORT_FLAG_CASE); |
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} |
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} |
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/** |
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* Drop-in replacement for ksort(). |
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* It uses a collator-based sort, or ksort() with flags SORT_NATURAL and SORT_FLAG_CASE as a fallback. |
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* |
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* @param array $array The input array. |
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* @return bool Returns true on success or false on failure. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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*/ |
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public static function ksort(&$array) |
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{ |
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$collator = self::getCollator(); |
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if (isset($collator)) { |
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return uksort($array, array($collator, 'compare')); |
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} else { |
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return ksort($array, SORT_NATURAL | SORT_FLAG_CASE); |
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} |
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} |
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/** |
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* Drop-in replacement for asort(), natsort() and natcasesort(). |
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* It uses a collator-based sort, or asort() with flags SORT_NATURAL and SORT_FLAG_CASE as a fallback. |
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* |
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* @param array $array The input array. |
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* @return bool Returns true on success or false on failure. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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*/ |
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public static function asort(&$array) |
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{ |
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$collator = self::getCollator(); |
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if (isset($collator)) { |
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return $collator->asort($array); |
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} else { |
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return asort($array, SORT_NATURAL | SORT_FLAG_CASE); |
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} |
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} |
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/** |
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* Drop-in replacement for asort(), natsort() and natcasesort() when the parameter is an array of filenames. |
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* Filenames may not be equal to page names, depending on the setting in $conf['fnencode'], |
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* so the correct behavior is to sort page names and reflect this sorting in the filename array. |
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* |
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* @param array $array The input array. |
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* @return bool Returns true on success or false on failure. |
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* |
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* @author Moisés Braga Ribeiro <[email protected]> |
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* @author Andreas Gohr <[email protected]> |
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*/ |
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public static function asortFN(&$array) |
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{ |
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$collator = self::getCollator(); |
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return uasort($array, function ($fn1, $fn2) use ($collator) { |
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if (isset($collator)) { |
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return $collator->compare(utf8_decodeFN($fn1), utf8_decodeFN($fn2)); |
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} else { |
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return strnatcasecmp(utf8_decodeFN($fn1), utf8_decodeFN($fn2)); |
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} |
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}); |
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} |
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} |
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