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- 27.10.2014
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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 class Unescaper
021 {
022 // Parser and Inline assume UTF-8 encoding, so escaped Unicode characters
023 // must be converted to that encoding.
024 // @deprecated since 2.5, to be removed in 3.0
025 const ENCODING = 'UTF-8';
026
027 // Regex fragment that matches an escaped character in a double quoted
028 // string.
029 const REGEX_ESCAPED_CHARACTER = "\\\\([0abt\tnvfre \\\"\\/\\\\N_LP]|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 $self = $this;
053 $callback = function ($match) use ($self) {
054 return $self->unescapeCharacter($match[0]);
055 };
056
057 // evaluate the string
058 return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
059 }
060
061 /**
062 * Unescapes a character that was found in a double-quoted string
063 *
064 * @param string $value An escaped character
065 *
066 * @return string The unescaped character
067 */
068 public function unescapeCharacter($value)
069 {
070 switch ($value{1}) {
071 case '0':
072 return "\x0";
073 case 'a':
074 return "\x7";
075 case 'b':
076 return "\x8";
077 case 't':
078 return "\t";
079 case "\t":
080 return "\t";
081 case 'n':
082 return "\n";
083 case 'v':
084 return "\xB";
085 case 'f':
086 return "\xC";
087 case 'r':
088 return "\r";
089 case 'e':
090 return "\x1B";
091 case ' ':
092 return ' ';
093 case '"':
094 return '"';
095 case '/':
096 return '/';
097 case '\\':
098 return '\\';
099 case 'N':
100 // U+0085 NEXT LINE
101 return "\xC2\x85";
102 case '_':
103 // U+00A0 NO-BREAK SPACE
104 return "\xC2\xA0";
105 case 'L':
106 // U+2028 LINE SEPARATOR
107 return "\xE2\x80\xA8";
108 case 'P':
109 // U+2029 PARAGRAPH SEPARATOR
110 return "\xE2\x80\xA9";
111 case 'x':
112 return self::utf8chr(hexdec(substr($value, 2, 2)));
113 case 'u':
114 return self::utf8chr(hexdec(substr($value, 2, 4)));
115 case 'U':
116 return self::utf8chr(hexdec(substr($value, 2, 8)));
117 }
118 }
119
120 /**
121 * Get the UTF-8 character for the given code point.
122 *
123 * @param int $c The unicode code point
124 *
125 * @return string The corresponding UTF-8 character
126 */
127 private static function utf8chr($c)
128 {
129 if (0x80 > $c %= 0x200000) {
130 return chr($c);
131 }
132 if (0x800 > $c) {
133 return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
134 }
135 if (0x10000 > $c) {
136 return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
137 }
138
139 return chr(0xF0 | $c >> 18).chr(0x80 | $c >> 12 & 0x3F).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
140 }
141 }
142