private static function getBraketsBlock($line, $len, $pos, $brace)
{
$stack = new SplStack();
$stack->push($brace);
for ($i = $pos + 1; $i < $len && !$stack->isEmpty(); $i++) {
$c = $line[$i];
if ($c == '\\') {
$i++;
continue;
}
if (Lexer::isClosingFor($stack->top(), $c)) {
$stack->pop();
} else {
if (Lexer::isPairingSymbol($c)) {
$stack->push($c);
}
}
}
return $stack->isEmpty() ? $i - $pos : -1;
}
