1 files changed, 27 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.5/packages/api-utils/lib/namespace.js b/tools/addon-sdk-1.5/packages/api-utils/lib/namespace.js
new file mode 100644
index 0000000..b25284e
--- /dev/null
+++ b/tools/addon-sdk-1.5/packages/api-utils/lib/namespace.js
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Function creates a new namespace. Optionally `prototype` object may be
+ * passed, in which case namespace objects will inherit from it. Returned value
+ * is a function that can be used to get access to the namespaced properties
+ * for the passed object.
+ * @examples
+ *    const ns = Namespace();
+ *    ns(myObject).secret = secret;
+ */
+exports.Namespace = function Namespace(prototype) {
+  prototype = prototype || Object.prototype;
+  const map = new WeakMap();
+  return function namespace(target) {
+    return map.get(target) ||
+           map.set(target, Object.create(prototype)), map.get(target);
+  };
+};
+
+// `Namespace` is a e4x function in the scope, so we export the function also as
+// `ns` as alias to avoid clashing.
+exports.ns = exports.Namespace;