/**
* "\" で始まる文字列を対応する文字に変換します.
*
* @param Context $context
* @return string
*/
private function decodeEscapedChar(Context $context)
{
// @codeCoverageIgnoreStart
static $specials = null;
if ($specials === null) {
$specials = array("\\" => "\\", '"' => '"', "/" => "/", "b" => chr(0x8), "f" => chr(0xc), "n" => "\n", "r" => "\r", "t" => "\t");
}
// @codeCoverageIgnoreEnd
$current = $context->current();
if (array_key_exists($current, $specials)) {
$context->next();
return $specials[$current];
}
// decode \uXXXX
if ($current !== "u") {
$context->throwException("Invalid escape sequence ('\\{$current}')");
}
$context->next();
$hex = $context->getSequence(4);
if (!preg_match("/^[0-9A-Fa-f]{4}\$/", $hex)) {
$context->throwException("Invalid hexadecimal sequence (Expected: \\uXXXX)");
}
$context->skip(4);
return $context->encodeCodepoint(hexdec($hex));
}
