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Components.utils.import('resource://greasemonkey/util.js');
const EXPORTED_SYMBOLS = ['windowId'];
function windowId(win) {
try {
// Do not operate on chrome windows.
win.QueryInterface(Components.interfaces.nsIDOMChromeWindow);
return null;
} catch (e) {
// We want this to fail. Catch is no-op.
}
try {
// Dunno why this is necessary, but sometimes we get non-chrome windows
// whose locations we cannot access.
var href = win.location.href;
if (!GM_util.isGreasemonkeyable(href)) return null;
} catch (e) {
return null;
}
var domWindowUtils = win
.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils);
var windowId;
try {
windowId = domWindowUtils.currentInnerWindowID;
} catch (e) { }
if ('undefined' == typeof windowId) {
// Firefox <4.0 does not provide this, use the document instead.
// (Document is a property of the window, and should let us dig into the
// "inner window" rather than always getting the same "outer window", due
// to bfcache. https://developer.mozilla.org/en/Inner_and_outer_windows )
return win.document;
}
return windowId;
}
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