Normalize string before checking it

Author: camdecoster

index.js

@@ -14,8 +14,9 @@ const cs = {
 	get: {},
 };
 
-cs.get = function (string) {
-	const prefix = string.slice(0, 3).toLowerCase();
+cs.get = function (string = '') {
+	string = normalizeString(string);
+	const prefix = string.slice(0, 3);
 	let value;
 	let model;
 	switch (prefix) {
@@ -45,10 +46,8 @@ cs.get = function (string) {
 	return {model, value};
 };
 
-cs.get.rgb = function (string) {
-	if (!string) {
-		return null;
-	}
+cs.get.rgb = function (string = '') {
+	string = normalizeString(string);
 
 	const abbr = /^#([a-f\d]{3,4})$/i;
 	const hex = /^#([a-f\d]{6})([a-f\d]{2})?$/i;
@@ -127,10 +126,8 @@ cs.get.rgb = function (string) {
 	return rgb;
 };
 
-cs.get.hsl = function (string) {
-	if (!string) {
-		return null;
-	}
+cs.get.hsl = function (string = '') {
+	string = normalizeString(string);
 
 	const hsl = /^hsla?\(\s*([+-]?(?:\d{0,3}\.)?\d+)(?:deg)?\s*,?\s*([+-]?[\d.]+)%\s*,?\s*([+-]?[\d.]+)%\s*(?:[,|/]\s*([+-]?(?=\.\d|\d)(?:0|[1-9]\d*)?(?:\.\d*)?(?:[eE][+-]?\d+)?)\s*)?\)$/;
 	const match = string.match(hsl);
@@ -148,10 +145,8 @@ cs.get.hsl = function (string) {
 	return null;
 };
 
-cs.get.hwb = function (string) {
-	if (!string) {
-		return null;
-	}
+cs.get.hwb = function (string = '') {
+	string = normalizeString(string);
 
 	const hwb = /^hwb\(\s*([+-]?\d{0,3}(?:\.\d+)?)(?:deg)?\s*,\s*([+-]?[\d.]+)%\s*,\s*([+-]?[\d.]+)%\s*(?:,\s*([+-]?(?=\.\d|\d)(?:0|[1-9]\d*)?(?:\.\d*)?(?:[eE][+-]?\d+)?)\s*)?\)$/;
 	const match = string.match(hwb);
@@ -227,4 +222,10 @@ function hexDouble(number_) {
 	return (string_.length < 2) ? '0' + string_ : string_;
 }
 
+function normalizeString(string) {
+	string = string.toLowerCase();
+
+	return string;
+}
+
 export default cs;