Adds support for hex values, rgba strings, malformed values with fail…

lib/_lu-utilities.js

@@ -0,0 +1,101 @@
+const testRgb = new RegExp(/rgb/);
+//eslint-disable-next-line
+const matchRgb = new RegExp(/rgba?\(([^\)]+)\)/);
+const testHex = new RegExp(/#\w+/);
+
+/**
+ * Returns a three-member number array from a hex string
+ * @param hex
+ * @returns {number[]}
+ */
+const safeHexToRgb = function safeHexToRgb(hex) {
+  const value = hex.trim().split('#');
+  var c = ['00', '00', '00'];
+  if (value.length === 1) {
+    c = value[0].split('');
+  }
+  if (value.length === 2) {
+    c = value[1].split('');
+  }
+  const l = c.length;
+  if (l === 3) return [hToD(c[0]), hToD(c[1]), hToD(c[2])];
+  if (l === 4) return [hToD(c[0]), hToD(c[1]), hToD(c[2])];
+  if (l === 6) return [hToD(c[0], c[1]), hToD(c[2], c[3]), hToD(c[4], c[5])];
+  if (l === 8) return [hToD(c[0], c[1]), hToD(c[2], c[3]), hToD(c[4], c[5])];
+  return [0, 0, 255];
+};
+
+/**
+ * Returns a sanitized three-number array representing RGB color values, with a safe default.
+ * @param string
+ * @returns {number[]}
+ */
+const getColorValue = function getColorValue(string) {
+  if (testRgb.test(string)) {
+    return safeRgbToRgb(string);
+  }
+  if (testHex.test(string)) {
+    return safeHexToRgb(string);
+  }
+  return [0, 0, 255];
+};
+
+/**
+ * Extracts the comma-separated numbers from a rgb(a?) string.
+ * @param string
+ * @returns {string}
+ */
+const extractRgbSubstring = function extractRgbSubstring(string) {
+  var candidate = string.match(matchRgb);
+  if (
+    candidate &&
+    candidate.length > 1 &&
+    candidate[1].length > 0 &&
+    typeof candidate[1] === 'string'
+  ) {
+    return candidate[1];
+  }
+  return '0,0,255';
+};
+
+/**
+ * Returns a base10 number from one or two hex digits
+ * @param h
+ * @returns {number}
+ */
+const hToD = function hToD(...h) {
+  var hh = '00';
+  if (h.length === 1) {
+    hh = '' + h[0] + h[0];
+  } else if (h.length === 2) {
+    hh = '' + h[0] + h[1];
+  }
+  var d = parseInt(hh, 16);
+  return !isNaN(d) ? d : 0;
+};
+
+/**
+ * Returns a three-member number array from a rgb string
+ * @param rgb
+ * @returns {number[]}
+ */
+const safeRgbToRgb = function safeRgbToRgb(rgb) {
+  var value = extractRgbSubstring(rgb)
+    .split(',')
+    .map(function(a) {
+      var b = parseInt(a, 10);
+      return !isNaN(b) ? b : 0;
+    });
+  if (value.length >= 3) {
+    return [value[0], value[1], value[2]];
+  }
+  return [0, 0, 255];
+};
+
+module.exports = {
+  getColorValue,
+  extractRgbSubstring,
+  hToD,
+  safeRgbToRgb,
+  safeHexToRgb
+};

lib/lost-utility.js

@@ -1,10 +1,5 @@
 var newBlock = require('./new-block.js');
-
-function getColorValue(string) {
-  var color = string.split('rgb(')[1];
-  color = color.split(')')[0];
-  return color;
-}
+var getColorValue = require('./_lu-utilities').getColorValue;
 
 function unitsMatch() {
   var args = Array.prototype.slice.call(arguments, 0);
@@ -34,7 +29,7 @@ module.exports = function lostUtilityDecl(css) {
           decl,
           ' *:not(input):not(textarea):not(select)',
           ['background-color'],
-          ['rgba(' + color + ', 0.1)']
+          ['rgba(' + color[0] + ',' + color[1] + ',' + color[2] + ', 0.1)']
         );
       } else {
         newBlock(