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<?php |
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|
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/* |
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* This file is part of the Symfony package. |
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* |
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* (c) Fabien Potencier <fabien@symfony.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace WindPressDeps\Symfony\Component\Yaml; |
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|
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use WindPressDeps\Symfony\Component\Yaml\Exception\ParseException; |
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/** |
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* Unescaper encapsulates unescaping rules for single and double-quoted |
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* YAML strings. |
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* |
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* @author Matthew Lewinski <matthew@lewinski.org> |
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* |
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* @internal |
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*/ |
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class Unescaper |
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{ |
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/** |
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* Regex fragment that matches an escaped character in a double quoted string. |
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*/ |
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public const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)'; |
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/** |
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* Unescapes a single quoted string. |
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* |
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* @param string $value A single quoted string |
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*/ |
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public function unescapeSingleQuotedString(string $value): string |
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{ |
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return str_replace('\'\'', '\'', $value); |
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} |
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/** |
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* Unescapes a double quoted string. |
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* |
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* @param string $value A double quoted string |
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*/ |
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public function unescapeDoubleQuotedString(string $value): string |
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{ |
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$callback = function ($match) { |
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return $this->unescapeCharacter($match[0]); |
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}; |
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// evaluate the string |
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return preg_replace_callback('/' . self::REGEX_ESCAPED_CHARACTER . '/u', $callback, $value); |
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} |
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/** |
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* Unescapes a character that was found in a double-quoted string. |
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* |
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* @param string $value An escaped character |
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*/ |
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private function unescapeCharacter(string $value): string |
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{ |
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switch ($value[1]) { |
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case '0': |
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return "\x00"; |
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case 'a': |
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return "\x07"; |
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case 'b': |
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return "\x08"; |
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case 't': |
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return "\t"; |
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case "\t": |
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return "\t"; |
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case 'n': |
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return "\n"; |
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case 'v': |
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return "\v"; |
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case 'f': |
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return "\f"; |
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case 'r': |
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return "\r"; |
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case 'e': |
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return "\x1b"; |
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case ' ': |
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return ' '; |
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case '"': |
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return '"'; |
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case '/': |
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return '/'; |
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case '\\': |
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return '\\'; |
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case 'N': |
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// U+0085 NEXT LINE |
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return "� |
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"; |
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case '_': |
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// U+00A0 NO-BREAK SPACE |
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return " "; |
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case 'L': |
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// U+2028 LINE SEPARATOR |
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return "
"; |
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case 'P': |
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// U+2029 PARAGRAPH SEPARATOR |
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return "
"; |
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case 'x': |
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return self::utf8chr(hexdec(substr($value, 2, 2))); |
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case 'u': |
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return self::utf8chr(hexdec(substr($value, 2, 4))); |
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case 'U': |
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return self::utf8chr(hexdec(substr($value, 2, 8))); |
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default: |
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throw new ParseException(sprintf('Found unknown escape character "%s".', $value)); |
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} |
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} |
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/** |
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* Get the UTF-8 character for the given code point. |
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*/ |
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private static function utf8chr(int $c): string |
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{ |
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if (0x80 > $c %= 0x200000) { |
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return \chr($c); |
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} |
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if (0x800 > $c) { |
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return \chr(0xc0 | $c >> 6) . \chr(0x80 | $c & 0x3f); |
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} |
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if (0x10000 > $c) { |
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return \chr(0xe0 | $c >> 12) . \chr(0x80 | $c >> 6 & 0x3f) . \chr(0x80 | $c & 0x3f); |
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} |
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return \chr(0xf0 | $c >> 18) . \chr(0x80 | $c >> 12 & 0x3f) . \chr(0x80 | $c >> 6 & 0x3f) . \chr(0x80 | $c & 0x3f); |
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} |
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} |
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|
