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Diffstat (limited to 'tools/addon-sdk-1.5/packages/api-utils/lib/environment.js')
-rw-r--r-- | tools/addon-sdk-1.5/packages/api-utils/lib/environment.js | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.5/packages/api-utils/lib/environment.js b/tools/addon-sdk-1.5/packages/api-utils/lib/environment.js new file mode 100644 index 0000000..fd95c67 --- /dev/null +++ b/tools/addon-sdk-1.5/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) +}); |