Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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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 /**
015 * Unescaper encapsulates unescaping rules for single and double-quoted
016 * YAML strings.
017 *
018 * @author Matthew Lewinski <matthew@lewinski.org>
019 *
020 * @internal
021 */
022 class Unescaper
023 {
024 /**
025 * Parser and Inline assume UTF-8 encoding, so escaped Unicode characters
026 * must be converted to that encoding.
027 *
028 * @deprecated since version 2.5, to be removed in 3.0
029 *
030 * @internal
031 */
032 const ENCODING = 'UTF-8';
033
034 /**
035 * Regex fragment that matches an escaped character in a double quoted string.
036 */
037 const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)';
038
039 /**
040 * Unescapes a single quoted string.
041 *
042 * @param string $value A single quoted string
043 *
044 * @return string The unescaped string
045 */
046 public function unescapeSingleQuotedString($value)
047 {
048 return str_replace('\'\'', '\'', $value);
049 }
050
051 /**
052 * Unescapes a double quoted string.
053 *
054 * @param string $value A double quoted string
055 *
056 * @return string The unescaped string
057 */
058 public function unescapeDoubleQuotedString($value)
059 {
060 $self = $this;
061 $callback = function ($match) use ($self) {
062 return $self->unescapeCharacter($match[0]);
063 };
064
065 // evaluate the string
066 return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
067 }
068
069 /**
070 * Unescapes a character that was found in a double-quoted string.
071 *
072 * @param string $value An escaped character
073 *
074 * @return string The unescaped character
075 *
076 * @internal This method is public to be usable as callback. It should not
077 * be used in user code. Should be changed in 3.0.
078 */
079 public function unescapeCharacter($value)
080 {
081 switch ($value[1]) {
082 case '0':
083 return "\x0";
084 case 'a':
085 return "\x7";
086 case 'b':
087 return "\x8";
088 case 't':
089 return "\t";
090 case "\t":
091 return "\t";
092 case 'n':
093 return "\n";
094 case 'v':
095 return "\xB";
096 case 'f':
097 return "\xC";
098 case 'r':
099 return "\r";
100 case 'e':
101 return "\x1B";
102 case ' ':
103 return ' ';
104 case '"':
105 return '"';
106 case '/':
107 return '/';
108 case '\\':
109 return '\\';
110 case 'N':
111 // U+0085 NEXT LINE
112 return "\xC2\x85";
113 case '_':
114 // U+00A0 NO-BREAK SPACE
115 return "\xC2\xA0";
116 case 'L':
117 // U+2028 LINE SEPARATOR
118 return "\xE2\x80\xA8";
119 case 'P':
120 // U+2029 PARAGRAPH SEPARATOR
121 return "\xE2\x80\xA9";
122 case 'x':
123 return self::utf8chr(hexdec(substr($value, 2, 2)));
124 case 'u':
125 return self::utf8chr(hexdec(substr($value, 2, 4)));
126 case 'U':
127 return self::utf8chr(hexdec(substr($value, 2, 8)));
128 default:
129 @trigger_error('Not escaping a backslash in a double-quoted string is deprecated since Symfony 2.8 and will throw a ParseException in 3.0.', E_USER_DEPRECATED);
130
131 return $value;
132 }
133 }
134
135 /**
136 * Get the UTF-8 character for the given code point.
137 *
138 * @param int $c The unicode code point
139 *
140 * @return string The corresponding UTF-8 character
141 */
142 private static function utf8chr($c)
143 {
144 if (0x80 > $c %= 0x200000) {
145 return chr($c);
146 }
147 if (0x800 > $c) {
148 return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
149 }
150 if (0x10000 > $c) {
151 return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
152 }
153
154 return chr(0xF0 | $c >> 18).chr(0x80 | $c >> 12 & 0x3F).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
155 }
156 }
157