--- /dev/null
+/*jshint -W004 */
+import SafeString from "./safe-string";
+
+var escape = {
+ "&": "&",
+ "<": "<",
+ ">": ">",
+ '"': """,
+ "'": "'",
+ "`": "`"
+};
+
+var badChars = /[&<>"'`]/g;
+var possible = /[&<>"'`]/;
+
+function escapeChar(chr) {
+ return escape[chr];
+}
+
+export function extend(obj /* , ...source */) {
+ for (var i = 1; i < arguments.length; i++) {
+ for (var key in arguments[i]) {
+ if (Object.prototype.hasOwnProperty.call(arguments[i], key)) {
+ obj[key] = arguments[i][key];
+ }
+ }
+ }
+
+ return obj;
+}
+
+export var toString = Object.prototype.toString;
+
+// Sourced from lodash
+// https://github.com/bestiejs/lodash/blob/master/LICENSE.txt
+var isFunction = function(value) {
+ return typeof value === 'function';
+};
+// fallback for older versions of Chrome and Safari
+/* istanbul ignore next */
+if (isFunction(/x/)) {
+ isFunction = function(value) {
+ return typeof value === 'function' && toString.call(value) === '[object Function]';
+ };
+}
+export var isFunction;
+
+/* istanbul ignore next */
+export var isArray = Array.isArray || function(value) {
+ return (value && typeof value === 'object') ? toString.call(value) === '[object Array]' : false;
+};
+
+
+export function escapeExpression(string) {
+ // don't escape SafeStrings, since they're already safe
+ if (string instanceof SafeString) {
+ return string.toString();
+ } else if (string == null) {
+ return "";
+ } else if (!string) {
+ return string + '';
+ }
+
+ // Force a string conversion as this will be done by the append regardless and
+ // the regex test will do this transparently behind the scenes, causing issues if
+ // an object's to string has escaped characters in it.
+ string = "" + string;
+
+ if(!possible.test(string)) { return string; }
+ return string.replace(badChars, escapeChar);
+}
+
+export function isEmpty(value) {
+ if (!value && value !== 0) {
+ return true;
+ } else if (isArray(value) && value.length === 0) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+export function appendContextPath(contextPath, id) {
+ return (contextPath ? contextPath + '.' : '') + id;
+}