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<?php
/**
* parser for optional sign
*/
namespace xKerman\Restricted;
* Parser for optional sign
class OptionalSignParser implements ParserInterface
{
* parse given `$source` and return sign if exist
*
* @param Source $source parser input
* @return array
public function parse(Source $source)
if (!$this->isSign($source->peek())) {
return ['', $source];
}
$sign = $source->peek();
$source->next();
return [$sign, $source];
* judge if given `$char` is minus|plus sign
* @param string $char target character
* @return boolean
private function isSign($char)
return $char === '+' || $char === '-';
xKerman /
restricted-unserialize
