parenthesis functionality infix binary tree

infixBinaryTreeParentheseFunctionality

if (token == '(') {
	operatorStack.push(token);
} else if (token == ')') {
	while(operatorStack.peek() != '(') {
		var subtree = createSubtree(operatorStack.pop(), null);
		outputStack.push(subtree);
	}
	operatorStack.pop();
}