Simplify braced detection

Author: dy

lib/operators.js

@@ -44,25 +44,6 @@ var opComplexity = {
 
 var opsRE = /\*|\+|\-|\/|\%|\<|\=|\>|\&|\||\!|\^|\~/;
 
-/**
- * Check if expression is protected by parentheses
- */
-function isBraced (exp) {
-	if (/\s/.test(exp)) {
-		// a + b
-		if (exp[0] !== '(') return false;
-
-		var level = 1;
-		var len = exp.length;
-		for (let i = 1; i < len - 1; i++) {
-			if (exp[i] === '(') level++;
-			else if (exp[i] === ')') level--;
-			// (a + b) * c + d
-			if (level === 0) return false;
-		}
-	}
-	return true;
-}
 
 /**
  * Return rendered operation
@@ -306,15 +287,15 @@ function processOperation (left, right, operator) {
 
 			// embrace complex operators
 			if (operator != '+' && operator != '-') {
-				if (!isBraced(left)) opResult += '(' + left + ')'
+				if (/\s/.test(left) && !(left[0] == '(' && left[left.length - 1] == ')')) opResult += '(' + left + ')'
 				else opResult += left
 			}
 			else opResult += left
 
 			opResult += ' ' + operator + ' '
 
 			if (operator != '+' && operator != '-') {
-				if (!isBraced(right)) opResult += '(' + right + ')'
+				if (/\s/.test(right) && !(right[0] == '(' && right[right.length - 1] == ')')) opResult += '(' + right + ')'
 				else opResult += right
 			}
 			else opResult += right