1 files changed, 54 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.7/packages/api-utils/lib/environment.js b/tools/addon-sdk-1.7/packages/api-utils/lib/environment.js
new file mode 100644
index 0000000..fd95c67
--- /dev/null
+++ b/tools/addon-sdk-1.7/packages/api-utils/lib/environment.js
@@ -0,0 +1,54 @@
+/* vim:set ts=2 sw=2 sts=2 expandtab */
+/* 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';
+
+const { Cc, Ci } = require('chrome');
+const { get, set, exists } = Cc['@mozilla.org/process/environment;1'].
+                             getService(Ci.nsIEnvironment);
+
+exports.env = Proxy.create({
+  // XPCOM does not provides a way to enumerate environment variables, so we
+  // just don't support enumeration.
+  getPropertyNames: function() [],
+  getOwnPropertyNames: function() [],
+  enumerate: function() [],
+  keys: function() [],
+  // We do not support freezing, cause it would make it impossible to set new
+  // environment variables.
+  fix: function() undefined,
+  // We present all environment variables as own properties of this object,
+  // so we just delegate this call to `getOwnPropertyDescriptor`.
+  getPropertyDescriptor: function(name) this.getOwnPropertyDescriptor(name),
+  // If environment variable with this name is defined, we generate proprety
+  // descriptor for it, otherwise fall back to `undefined` so that for consumer
+  // this property does not exists.
+  getOwnPropertyDescriptor: function(name) {
+    return !exists(name) ? undefined : {
+      value: get(name),
+      enumerable: false,    // Non-enumerable as we don't support enumeration.
+      configurable: true,   // Configurable as it may be deleted.
+      writable: true        // Writable as we do support set.
+    }
+  },
+
+  // New environment variables can be defined just by defining properties
+  // on this object.
+  defineProperty: function(name, { value }) set(name, value),
+  delete: function(name) set(name, null),
+
+  // We present all properties as own, there for we just delegate to `hasOwn`.
+  has: function(name) this.hasOwn(name),
+  // We do support checks for existence of an environment variable, via `in`
+  // operator on this object.
+  hasOwn: function(name) exists(name),
+
+  // On property get / set we do read / write appropriate environment variables,
+  // please note though, that variables with names of standard object properties
+  // intentionally (so that this behaves as normal object) can not be
+  // read / set.
+  get: function(proxy, name) Object.prototype[name] || get(name) || undefined,
+  set: function(proxy, name, value) Object.prototype[name] || set(name, value)
+});