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<?php |
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/** |
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* This file is part of PHP-Typography. |
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* |
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* Copyright 2014-2017 Peter Putzer. |
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* Copyright 2009-2011 KINGdesk, LLC. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* |
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* *** |
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* |
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* @package mundschenk-at/php-typography |
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* @license http://www.gnu.org/licenses/gpl-2.0.html |
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*/ |
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namespace PHP_Typography; |
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/** |
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* A utility class to handle fast and save string function access. |
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* |
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* @since 4.2.0 |
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*/ |
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abstract class Strings { |
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/** |
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* Utility patterns for splitting string parameter lists into arrays. |
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* |
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* @var string |
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*/ |
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const _RE_PARAMETER_SPLITTING = '/[\s,]+/S'; |
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/** |
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* An array of encodings in detection order. |
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* |
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* ASCII has to be first to have a chance of detection. |
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* |
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* @var array |
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*/ |
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const _ENCODINGS = [ 'ASCII', 'UTF-8' ]; |
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/** |
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* A hash map for string functions according to encoding. |
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* |
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* @var array $encoding => [ 'strlen' => $function_name, ... ]. |
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*/ |
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const _STRING_FUNCTIONS = [ |
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'UTF-8' => [ |
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'strlen' => 'mb_strlen', |
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'str_split' => [ __CLASS__, 'mb_str_split' ], |
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'strtolower' => 'mb_strtolower', |
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'strtoupper' => 'mb_strtoupper', |
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'substr' => 'mb_substr', |
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'u' => 'u', |
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], |
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'ASCII' => [ |
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'strlen' => 'strlen', |
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'str_split' => 'str_split', |
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'strtolower' => 'strtolower', |
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'strtoupper' => 'strtoupper', |
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'substr' => 'substr', |
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'u' => '', |
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], |
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false => [], |
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]; |
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/** |
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* Retrieves str* functions. |
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* |
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* @param string $str A string to detect the encoding from. |
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* @return array { |
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* An array of string functions. |
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* |
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* 'strlen' => callable, |
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* 'str_split' => callable, |
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* 'strtolower' => callable, |
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* 'strtoupper' => callable, |
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* 'substr' => callable, |
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* 'u' => modifier string |
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* } |
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*/ |
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public static function functions( $str ) { |
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return self::_STRING_FUNCTIONS[ mb_detect_encoding( $str, self::_ENCODINGS, true ) ]; |
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} |
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/** |
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* Multibyte-safe str_split function. |
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* |
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* Unlike str_split, a $split_length less than 1 is ignored (and thus |
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* equivalent to the default). |
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* |
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* @param string $str Required. |
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* @param int $split_length Optional. Default 1. |
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* |
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* @return array An array of $split_length character chunks. |
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*/ |
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public static function mb_str_split( $str, $split_length = 1 ) { |
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$result = preg_split( '//u', $str , -1, PREG_SPLIT_NO_EMPTY ); |
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if ( $split_length > 1 ) { |
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$splits = []; |
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foreach ( array_chunk( $result, $split_length ) as $chunk ) { |
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$splits[] = join( '', $chunk ); |
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} |
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$result = $splits; |
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} |
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return $result; |
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} |
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/** |
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* Converts decimal value to unicode character. |
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* |
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* @param int|string|array $codes Decimal value(s) coresponding to unicode character(s). |
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* |
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* @return string Unicode character(s). |
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*/ |
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public static function uchr( $codes ) { |
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// Single character code. |
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if ( is_scalar( $codes ) ) { |
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$codes = func_get_args(); |
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} |
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// Deal with an array of character codes. |
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$str = ''; |
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foreach ( $codes as $code ) { |
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$str .= html_entity_decode( '&#' . (int) $code . ';', ENT_NOQUOTES, 'UTF-8' ); |
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} |
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return $str; |
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} |
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/** |
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* If necessary, split the passed parameters string into an array. |
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* |
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* @param array|string $params Parameters. |
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* |
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* @return array |
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*/ |
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public static function maybe_split_parameters( $params ) { |
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if ( ! is_array( $params ) ) { |
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$params = preg_split( self::_RE_PARAMETER_SPLITTING, $params, -1, PREG_SPLIT_NO_EMPTY ); |
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} |
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return $params; |
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} |
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} |
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mundschenk-at /
php-typography
