21     * @param integer $offset
24     abstract public function getToken(string $buffer, int $offset): ?Token;  argument
46     * @param integer $offset
50     protected function matchPattern(string $buffer, int $offset, string $pattern): ?string {  argument
52         $pattern, $buffer, $match, PREG_OFFSET_CAPTURE, $offset
57         $match[0][1] === $offset
64     protected function matchPatterns(string $buffer, int $offset, array $patterns): ?Token {  argument
67           $buffer, $offset, $pattern
71             $type, $tokenString, $offset
78     protected function matchCharacters(string $buffer, int $offset, array $chars): ?Token {  argument
79       if (isset($buffer[$offset])) {
80         $char = $buffer[$offset];
83             return new Token($type, $char, $offset);