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Diffstat (limited to 'tools/addon-sdk-1.4/packages/api-utils/lib/environment.js')
-rw-r--r-- | tools/addon-sdk-1.4/packages/api-utils/lib/environment.js | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.4/packages/api-utils/lib/environment.js b/tools/addon-sdk-1.4/packages/api-utils/lib/environment.js new file mode 100644 index 0000000..5753801 --- /dev/null +++ b/tools/addon-sdk-1.4/packages/api-utils/lib/environment.js @@ -0,0 +1,86 @@ +/* vim:set ts=2 sw=2 sts=2 expandtab */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is Mozilla. + * Portions created by the Initial Developer are Copyright (C) 2011 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Irakli Gozalishvili <gozala@mozilla.com> (Original Author) + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +'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) +}); |