Compiler operator precedence

Value* parse_value(..., int prio) {
   tok = token();
   value = ... value logic ...
   else throw invalid value token
   // Trailing tokens
   tok = token();
   if prio == 0 || prio >= 10 {
      while(tok == "*" || tok == "/"){
		left = value;
        right = parse_value(..., 10);
        tok = token();
      }
   }
   if prio == 0 || prio >= 20 {
      while(tok == "+" || tok == "-"){
		left = value;
        right = parse_value(..., 20);
        tok = token();
      }
   }
   token_back(); // Not a trailing token, move parser back 1 token
}

Usage:
Value* val = parse_value(..., 0);