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<?php |
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/** |
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* This file is part of Aura for PHP. |
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* @license http://opensource.org/licenses/bsd-license.php BSD |
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* |
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*/ |
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namespace Aura\Filter\Rule; |
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use Aura\Filter\Exception; |
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/** |
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* |
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* Abstract rule for character case filters; supports the `mbstring` |
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* extension. |
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* |
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* @package Aura.Filter |
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* |
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*/ |
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abstract class AbstractCharCase extends AbstractStrlen |
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{ |
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/** |
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* |
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* Proxy to `mb_convert_case()` when available; fall back to |
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* `utf8_decode()` and `strtolower()` otherwise. |
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* |
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* @param string $str String to convert case. |
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* |
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* @return string |
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* |
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*/ |
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protected function strtolower($str) |
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{ |
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if ($this->mbstring()) { |
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return mb_convert_case($str, MB_CASE_LOWER, 'UTF-8'); |
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} |
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return strtolower(utf8_decode($str)); |
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} |
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/** |
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* |
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* Proxy to `mb_convert_case()` when available; fall back to |
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* `utf8_decode()` and `strtoupper()` otherwise. |
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* |
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* @param string $str String to convert case. |
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* |
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* @return string |
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* |
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*/ |
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protected function strtoupper($str) |
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{ |
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if ($this->mbstring()) { |
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return mb_convert_case($str, MB_CASE_UPPER, 'UTF-8'); |
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} |
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return strtoupper(utf8_decode($str)); |
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} |
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/** |
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* |
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* Proxy to `mb_convert_case()` when available; fall back to |
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* `utf8_decode()` and `ucwords()` otherwise. |
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* |
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* @param string $str String to convert case. |
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* |
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* @return int |
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* |
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*/ |
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protected function ucwords($str) |
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{ |
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if ($this->mbstring()) { |
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return mb_convert_case($str, MB_CASE_TITLE, 'UTF-8'); |
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} |
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return ucwords(utf8_decode($str)); |
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} |
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/** |
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* |
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* Proxy to `mb_convert_case()` when available; fall back to |
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* `utf8_decode()` and `strtoupper()` otherwise. |
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* |
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* @param string $str String to convert case. |
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* |
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* @return int |
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* |
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*/ |
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protected function ucfirst($str) |
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{ |
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$len = $this->strlen($str); |
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if ($len == 0) { |
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return ''; |
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} |
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if ($len > 1) { |
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$head = $this->substr($str, 0, 1); |
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$tail = $this->substr($str, 1, $len - 1); |
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return $this->strtoupper($head) . $tail; |
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} |
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return $this->strtoupper($str); |
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} |
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/** |
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* |
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* Proxy to `mb_convert_case()` when available; fall back to |
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* `utf8_decode()` and `strtolower()` otherwise. |
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* |
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* @param string $str String to convert case. |
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* |
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* @return int |
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* |
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*/ |
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protected function lcfirst($str) |
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{ |
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$len = $this->strlen($str); |
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if ($len == 0) { |
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// empty string |
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return ''; |
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} |
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if ($len > 1) { |
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// more than a single character |
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$head = $this->substr($str, 0, 1); |
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$tail = $this->substr($str, 1, $len - 1); |
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return $this->strtolower($head) . $tail; |
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} |
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return $this->strtolower($str); |
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} |
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} |
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