????
Current Path : /opt/alt/php53/usr/share/pear/Symfony/Component/Yaml/ |
Current File : //opt/alt/php53/usr/share/pear/Symfony/Component/Yaml/Unescaper.php |
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Yaml; /** * Unescaper encapsulates unescaping rules for single and double-quoted * YAML strings. * * @author Matthew Lewinski <matthew@lewinski.org> */ class Unescaper { // Parser and Inline assume UTF-8 encoding, so escaped Unicode characters // must be converted to that encoding. const ENCODING = 'UTF-8'; // Regex fragment that matches an escaped character in a double quoted // string. 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})"; /** * Unescapes a single quoted string. * * @param string $value A single quoted string. * * @return string The unescaped string. */ public function unescapeSingleQuotedString($value) { return str_replace('\'\'', '\'', $value); } /** * Unescapes a double quoted string. * * @param string $value A double quoted string. * * @return string The unescaped string. */ public function unescapeDoubleQuotedString($value) { $self = $this; $callback = function ($match) use ($self) { return $self->unescapeCharacter($match[0]); }; // evaluate the string return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value); } /** * Unescapes a character that was found in a double-quoted string * * @param string $value An escaped character * * @return string The unescaped character */ public function unescapeCharacter($value) { switch ($value{1}) { case '0': return "\x0"; case 'a': return "\x7"; case 'b': return "\x8"; case 't': return "\t"; case "\t": return "\t"; case 'n': return "\n"; case 'v': return "\xb"; case 'f': return "\xc"; case 'r': return "\xd"; case 'e': return "\x1b"; case ' ': return ' '; case '"': return '"'; case '/': return '/'; case '\\': return '\\'; case 'N': // U+0085 NEXT LINE return $this->convertEncoding("\x00\x85", self::ENCODING, 'UCS-2BE'); case '_': // U+00A0 NO-BREAK SPACE return $this->convertEncoding("\x00\xA0", self::ENCODING, 'UCS-2BE'); case 'L': // U+2028 LINE SEPARATOR return $this->convertEncoding("\x20\x28", self::ENCODING, 'UCS-2BE'); case 'P': // U+2029 PARAGRAPH SEPARATOR return $this->convertEncoding("\x20\x29", self::ENCODING, 'UCS-2BE'); case 'x': $char = pack('n', hexdec(substr($value, 2, 2))); return $this->convertEncoding($char, self::ENCODING, 'UCS-2BE'); case 'u': $char = pack('n', hexdec(substr($value, 2, 4))); return $this->convertEncoding($char, self::ENCODING, 'UCS-2BE'); case 'U': $char = pack('N', hexdec(substr($value, 2, 8))); return $this->convertEncoding($char, self::ENCODING, 'UCS-4BE'); } } /** * Convert a string from one encoding to another. * * @param string $value The string to convert * @param string $to The input encoding * @param string $from The output encoding * * @return string The string with the new encoding * * @throws \RuntimeException if no suitable encoding function is found (iconv or mbstring) */ private function convertEncoding($value, $to, $from) { if (function_exists('mb_convert_encoding')) { return mb_convert_encoding($value, $to, $from); } elseif (function_exists('iconv')) { return iconv($from, $to, $value); } throw new \RuntimeException('No suitable convert encoding function (install the iconv or mbstring extension).'); } }