Added more flexible check for HEX color code. Also error is now less specific.

Author: peruginni

lib/less/parser.js

@@ -960,12 +960,11 @@ less.Parser = function Parser(env) {
                     var rgb;
 
                     if (input.charAt(i) === '#' && (rgb = $re(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
-                        if (rgb[1].length === 3) {
-                            var followingCharacter = rgb.input.substring(4,5);
-                            if (followingCharacter.match(/[A-Za-z]{1}/)) {
-                                error("Some characters in HEX code are not valid. (see issue #1015)");
-                            }
-                        }
+                        var colorCandidateString = rgb.input.match(/^#([\w]+).*/); // strip colons, brackets, whitespaces and other characters that should not definitely be part of color string
+                        colorCandidateString = colorCandidateString[1];
+                        if (!colorCandidateString.match(/^[A-Fa-f0-9]+$/)) { // verify if candidate consists only of allowed HEX characters
+                            error("Invalid HEX color code");
+                        } 
                         return new(tree.Color)(rgb[1]);
                     }
                 },

test/less/errors/color-invalid-hex-code.txt

@@ -1,4 +1,4 @@
-SyntaxError: Some characters in HEX code are not valid. (see issue #1015) in {path}color-invalid-hex-code.less on line 2, column 29:
+SyntaxError: Invalid HEX color code in {path}color-invalid-hex-code.less on line 2, column 29:
 1 .a {
 2     @wrongHEXColorCode: #DCALLB;
 3 }