143 lines
3.8 KiB
PHP
143 lines
3.8 KiB
PHP
<?php
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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 Symfony\Component\Yaml;
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use 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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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 $value A single quoted string.
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*
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* @return string The unescaped string.
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*/
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public function unescapeSingleQuotedString($value)
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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 $value A double quoted string.
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*
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* @return string The unescaped string.
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*/
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public function unescapeDoubleQuotedString($value)
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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 $value An escaped character
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*
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* @return string The unescaped character
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*/
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private function unescapeCharacter($value)
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{
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switch ($value[1]) {
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case '0':
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return "\x0";
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case 'a':
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return "\x7";
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case 'b':
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return "\x8";
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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 "\xB";
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case 'f':
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return "\xC";
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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 "\xC2\x85";
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case '_':
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// U+00A0 NO-BREAK SPACE
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return "\xC2\xA0";
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case 'L':
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// U+2028 LINE SEPARATOR
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return "\xE2\x80\xA8";
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case 'P':
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// U+2029 PARAGRAPH SEPARATOR
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return "\xE2\x80\xA9";
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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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* @param int $c The unicode code point
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*
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* @return string The corresponding UTF-8 character
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*/
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private static function utf8chr($c)
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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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