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<?php /** * SCSSPHP * * @copyright 2012-2020 Leaf Corcoran * * @license http://opensource.org/licenses/MIT MIT * * @link http://scssphp.github.io/scssphp */ namespace ScssPhp\ScssPhp\Util; use ScssPhp\ScssPhp\Parser\StringScanner; /** * @internal */ final class ParserUtil { /** * Consumes an escape sequence from $scanner and returns the character it * represents. */ public static function consumeEscapedCharacter(StringScanner $scanner): string { // See https://drafts.csswg.org/css-syntax-3/#consume-escaped-code-point. $scanner->expectChar('\\'); $first = $scanner->peekChar(); if ($first === null) { return "\u{FFFD}"; } if (Character::isNewline($first)) { $scanner->error('Expected escape sequence.'); } if (Character::isHex($first)) { $value = 0; for ($i = 0; $i < 6; $i++) { $next = $scanner->peekChar(); if ($next === null || !Character::isHex($next)) { break; } $value *= 16; $value += hexdec($scanner->readChar()); assert(\is_int($value)); } if (Character::isWhitespace($scanner->peekChar())) { $scanner->readChar(); } if ($value === 0 || ($value >= 0xD800 && $value <= 0xDFFF) || $value >= 0x10FFFF) { return "\u{FFFD}"; } return mb_chr($value, 'UTF-8'); } return $scanner->readUtf8Char(); } }
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