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- 28.08.2024
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Unescaper.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Yaml;
013
014 use Symfony\Component\Yaml\Exception\ParseException;
015
016 /**
017 * Unescaper encapsulates unescaping rules for single and double-quoted
018 * YAML strings.
019 *
020 * @author Matthew Lewinski <matthew@lewinski.org>
021 *
022 * @internal
023 */
024 class Unescaper
025 {
026 /**
027 * Regex fragment that matches an escaped character in a double quoted string.
028 */
029 const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)';
030
031 /**
032 * Unescapes a single quoted string.
033 *
034 * @param string $value A single quoted string
035 *
036 * @return string The unescaped string
037 */
038 public function unescapeSingleQuotedString($value)
039 {
040 return str_replace('\'\'', '\'', $value);
041 }
042
043 /**
044 * Unescapes a double quoted string.
045 *
046 * @param string $value A double quoted string
047 *
048 * @return string The unescaped string
049 */
050 public function unescapeDoubleQuotedString($value)
051 {
052 $callback = function ($match) {
053 return $this->unescapeCharacter($match[0]);
054 };
055
056 // evaluate the string
057 return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
058 }
059
060 /**
061 * Unescapes a character that was found in a double-quoted string.
062 *
063 * @param string $value An escaped character
064 *
065 * @return string The unescaped character
066 */
067 private function unescapeCharacter($value)
068 {
069 switch ($value[1]) {
070 case '0':
071 return "\x0";
072 case 'a':
073 return "\x7";
074 case 'b':
075 return "\x8";
076 case 't':
077 return "\t";
078 case "\t":
079 return "\t";
080 case 'n':
081 return "\n";
082 case 'v':
083 return "\xB";
084 case 'f':
085 return "\xC";
086 case 'r':
087 return "\r";
088 case 'e':
089 return "\x1B";
090 case ' ':
091 return ' ';
092 case '"':
093 return '"';
094 case '/':
095 return '/';
096 case '\\':
097 return '\\';
098 case 'N':
099 // U+0085 NEXT LINE
100 return "\xC2\x85";
101 case '_':
102 // U+00A0 NO-BREAK SPACE
103 return "\xC2\xA0";
104 case 'L':
105 // U+2028 LINE SEPARATOR
106 return "\xE2\x80\xA8";
107 case 'P':
108 // U+2029 PARAGRAPH SEPARATOR
109 return "\xE2\x80\xA9";
110 case 'x':
111 return self::utf8chr(hexdec(substr($value, 2, 2)));
112 case 'u':
113 return self::utf8chr(hexdec(substr($value, 2, 4)));
114 case 'U':
115 return self::utf8chr(hexdec(substr($value, 2, 8)));
116 default:
117 throw new ParseException(sprintf('Found unknown escape character "%s".', $value));
118 }
119 }
120
121 /**
122 * Get the UTF-8 character for the given code point.
123 *
124 * @param int $c The unicode code point
125 *
126 * @return string The corresponding UTF-8 character
127 */
128 private static function utf8chr($c)
129 {
130 if (0x80 > $c %= 0x200000) {
131 return \chr($c);
132 }
133 if (0x800 > $c) {
134 return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F);
135 }
136 if (0x10000 > $c) {
137 return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
138 }
139
140 return \chr(0xF0 | $c >> 18).\chr(0x80 | $c >> 12 & 0x3F).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
141 }
142 }
143