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<?php |
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/** |
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* Linna Filter |
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* |
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* @author Sebastian Rapetti <[email protected]> |
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* @copyright (c) 2018, Sebastian Rapetti |
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* @license http://opensource.org/licenses/MIT MIT License |
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*/ |
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declare(strict_types = 1); |
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namespace Linna\Filter\Rules; |
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/** |
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* Return html entities. |
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*/ |
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class Escape |
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{ |
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/** |
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* @var array Arguments expected. |
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*/ |
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private $arguments = []; |
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/** |
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* @var array Permitted ASCII table chars in interger format. |
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*/ |
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private const PERMITTED = [ |
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32,48,49,50,51,52,53,54,55,56,57,65,66,67,68, |
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69,70,71,72,73,74,75,76,77,78,79,80,81,82,83, |
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84,85,86,87,88,89,90,97,98,99,100,101,102,103, |
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104,105,106,107,108,109,110,111,112,113,114, |
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115,116,117,118,119,120,121,122 |
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]; |
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/** |
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* Sanitize. |
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* |
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* @param mixed $value |
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*/ |
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public function sanitize(&$value): void |
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{ |
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$value = $this->htmlEscape($value); |
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} |
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/** |
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* Return numerical part of the HTML encoding of the Unicode character. |
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* |
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* @param string $char |
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* @return int |
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*/ |
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private function ordutf8(string $char): int |
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{ |
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$code = ord($char[0]); |
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if ($code > 239) { |
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return ((ord(substr($char, 1, 1)) - 128) * |
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64 + ord(substr($char, 2, 1)) - 128) * |
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64 + ord(substr($char, 3, 1)) - 128; |
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} |
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if ($code > 223) { |
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return (($code - 224) * 64 + ord(substr($char, 1, 1)) - 128) * |
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2 |
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64 + ord(substr($char, 2, 1)) - 128; |
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} |
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66
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if ($code > 127) { |
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return ($code - 192) * 64 + ord(substr($char, 1, 1)) - 128; |
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} |
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return $code; |
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} |
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73
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/** |
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* Convert char to html entities. |
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* |
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* @param string $string |
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* @return string |
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*/ |
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private function htmlEscape(string $string): string |
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{ |
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$chars = preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY); |
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$escaped = ''; |
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84
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foreach ($chars as $char) { |
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$ord = $this->ordutf8($char); |
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if (in_array($ord, self::PERMITTED)) { |
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$escaped .= $char; |
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continue; |
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} |
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$escaped .= "&#{$ord};"; |
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} |
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return $escaped; |
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} |
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} |
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linna /
filter
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