code: function (tokenstack, operstack, type_) {
  			var operator = new Token(type_, this.tokenindex, this.tokenprio + this.tmpprio, 0);
  			while (operstack.length > 0) {
  				if (operator.prio_ <= operstack[operstack.length - 1].prio_) {
  					tokenstack.push(operstack.pop());
  				}
  				else {
  					break;
  				}
  			}
  			operstack.push(operator);
  		}
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