mirror of
https://github.com/classilla/tenfourfox.git
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92 lines
3.3 KiB
JavaScript
92 lines
3.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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const make = (exports, rootURI, components) => {
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const { Loader: { Loader, Require, Module, main } } =
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components.utils.import(rootURI + "toolkit/loader.js", {});
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const loader = Loader({
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id: "toolkit/require",
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rootURI: rootURI,
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isNative: true,
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paths: {
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"": rootURI,
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"devtools/": "resource://devtools/"
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}
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});
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// Implement require.unload(uri) that can be used to unload
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// already loaded module which is convinient during development phase.
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const unload = uri => {
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delete loader.sandboxes[uri];
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delete loader.modules[uri];
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};
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const builtins = new Set(Object.keys(loader.modules));
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// Below we define `require` & `require.resolve` that resolve passed
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// module id relative to the caller URI. This is not perfect but good
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// enough for common case & there is always an option to pass absolute
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// id when that
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// but presumably well enough to cover
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const require = (id, options={}) => {
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const { reload, all } = options;
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const requirerURI = components.stack.caller.filename;
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const requirer = Module(requirerURI, requirerURI);
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const require = Require(loader, requirer);
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if (reload) {
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// To load JS code into modules, loader uses `mozIJSSubScriptLoader`
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// which uses startup cache to avoid reading source from the same URI
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// more than once. Unless we invalidate statup cache changes to a module
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// won't be reflected even after reload. Therefor we must dispatch an
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// nsIObserverService notification that causes cache invalidation.
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// Note: This is not ideal since it destroys whole cache, but since there
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// is no way to invalidate individual entries, we assume performance hit
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// during development is acceptable.
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components.classes["@mozilla.org/observer-service;1"].
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getService(components.interfaces.nsIObserverService).
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notifyObservers({}, "startupcache-invalidate", null);
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if (all) {
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for (let uri of Object.keys(loader.sandboxes)) {
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unload(uri);
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}
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}
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else {
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unload(require.resolve(id));
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}
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}
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return require(id);
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};
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require.resolve = id => {
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const requirerURI = components.stack.caller.filename;
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const requirer = Module(requirerURI, requirerURI);
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return Require(loader, requirer).resolve(id);
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};
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exports.require = require;
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}
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// If loaded in the context of commonjs module, reload as JSM into an
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// exports object.
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if (typeof(require) === "function" && typeof(module) === "object") {
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require("chrome").Cu.import(module.uri, module.exports);
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}
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// If loaded in the context of JSM make a loader & require and define
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// new symbols as exported ones.
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else if (typeof(__URI__) === "string" && this["Components"]) {
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const builtin = Object.keys(this);
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const uri = __URI__.replace("toolkit/require.js", "");
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make(this, uri, this["Components"]);
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this.EXPORTED_SYMBOLS = Object.
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keys(this).
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filter($ => builtin.indexOf($) < 0);
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}
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else {
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throw Error("Loading require.js in this environment isn't supported")
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}
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