added: Number.prototype.add()

petersirka · petersirka · commit e872c5b67696 · 2015-07-07T11:06:48.000+02:00
diff --git a/changes.txt b/changes.txt
@@ -21,6 +21,7 @@ BETA ======= 1.8.1
 - added: `F.responseBinary(req, res, contentType, buffer, [type], [download], [headers])`
 - added: `SchemaBuilderEntity.filter(custom, [model], [reverse])`
 - added: `SchemaBuilderEntity.trim = true`(enable/disable trim strings (default: true))
+- added: `Number.prototype.add(value, [decimals])` -> supports percentage
 - added: `Date.prototype.toUTC([ticksOnly])`
 - added: `Date.prototype.extend()` -> extend current datetime about new date or time (more in documentation)
 - added: `F.stats.request.mobile`, `F.stats.request.desktop`
diff --git a/test/test-utils.js b/test/test-utils.js
@@ -45,6 +45,10 @@ function prototypeNumber() {
 	assert.ok(number.floor(4) === 10.1034, 'floor number: 4 decimals');
 	assert.ok(number.floor(0) === 10, 'floor number: 0 decimals');
 	assert.ok(number.hex() === 'A.1A7AB75643028', 'number to hex');
+	assert.ok(number.add('10%', 0) === 1, 'add number: 1');
+	assert.ok(number.add('+10%', 0) === 11, 'add number: 2');
+	assert.ok(number.add('-10%', 0) === 9, 'add number: 3');
+	assert.ok(number.add('*2', 0) === 20, 'add number: 4');
 }
 
 // test: string prototype
diff --git a/utils.js b/utils.js
@@ -3130,6 +3130,72 @@ Number.prototype.format = function(decimals, separator, separatorDecimal) {
 	return minus + output + (dec.length > 0 ? separatorDecimal + dec : '');
 };
 
+Number.prototype.add = function(value, decimals) {
+
+	if (value === undefined || value === null)
+		return this;
+
+	if (typeof(value) === NUMBER)
+		return this + value;
+
+	var first = value.charCodeAt(0);
+	var is = false;
+
+	if (first < 48 || first > 57) {
+		is = true;
+		value = value.substring(1);
+	}
+
+	var length = value.length;
+	var isPercentage = false;
+	var num;
+
+	if (value[length - 1] === '%') {
+		value = value.substring(0, length - 1);
+		isPercentage = true;
+
+		if (is) {
+			var tmp = ((value.parseFloat() / 100) + 1);
+			if (first === 43 || first === 42)
+				num = this * tmp;
+			else
+				num = this / tmp;
+			return decimals !== undefined ? num.floor(decimals) : num;
+		} else {
+			num = (this / 100) * value.parseFloat();
+			return decimals !== undefined ? num.floor(decimals) : num;
+		}
+
+	} else
+		num = value.parseFloat();
+
+	switch (first) {
+		case 42:
+			num = this * num;
+			break;
+		case 43:
+			num = this + num;
+			break;
+		case 45:
+			num = this - num;
+			break;
+		case 47:
+			num = this / num;
+			break;
+		case 47:
+			num = this / num;
+			break;
+		default:
+			num = this;
+			break;
+	}
+
+	if (decimals !== undefined)
+		return num.floor(decimals);
+
+	return num;
+};
+
 /*
 	Format number :: 10000 = 10 000
 	@format {Number or String} :: number is decimal and string is specified format, example: ## ###.##
@@ -4665,4 +4731,4 @@ exports.minifyHTML = function(value) {
 
 global.async = exports.async;
 global.sync = global.SYNCHRONIZE = exports.sync;
-global.sync2 = exports.sync2;
+global.sync2 = exports.sync2;
