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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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50
browser/components/sessionstore/DocShellCapabilities.jsm Normal file
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/* 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";
this.EXPORTED_SYMBOLS = ["DocShellCapabilities"];
/**
* The external API exported by this module.
*/
this.DocShellCapabilities = Object.freeze({
collect: function (docShell) {
return DocShellCapabilitiesInternal.collect(docShell);
},
restore: function (docShell, disallow) {
return DocShellCapabilitiesInternal.restore(docShell, disallow);
},
});
/**
* Internal functionality to save and restore the docShell.allow* properties.
*/
var DocShellCapabilitiesInternal = {
// List of docShell capabilities to (re)store. These are automatically
// retrieved from a given docShell if not already collected before.
// This is made so they're automatically in sync with all nsIDocShell.allow*
// properties.
caps: null,
allCapabilities: function (docShell) {
if (!this.caps) {
let keys = Object.keys(docShell);
this.caps = keys.filter(k => k.startsWith("allow")).map(k => k.slice(5));
}
return this.caps;
},
collect: function (docShell) {
let caps = this.allCapabilities(docShell);
return caps.filter(cap => !docShell["allow" + cap]);
},
restore: function (docShell, disallow) {
let caps = this.allCapabilities(docShell);
for (let cap of caps)
docShell["allow" + cap] = !disallow.has(cap);
},
};