示例#1
0
 public function parseInputStreamWithBacktracking(InputStreamInterface $input, ExpressionResultInterface $previous_result = null)
 {
     if ($previous_result !== null) {
         return null;
     }
     if ($input->matchesChar($this->string) === false) {
         return null;
     }
     $input->move(1);
     return $this->result;
 }