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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";
+
+const BaseLoader = ChromeUtils.importESModule(
+ "resource://devtools/shared/loader/base-loader.sys.mjs"
+);
+const { require: devtoolsRequire, loader } = ChromeUtils.importESModule(
+ "resource://devtools/shared/loader/Loader.sys.mjs"
+);
+const flags = devtoolsRequire("devtools/shared/flags");
+const { joinURI } = devtoolsRequire("devtools/shared/path");
+const { assert } = devtoolsRequire("devtools/shared/DevToolsUtils");
+
+const lazy = {};
+
+loader.lazyRequireGetter(
+ lazy,
+ "getMockedModule",
+ "resource://devtools/shared/loader/browser-loader-mocks.js",
+ {}
+);
+
+const BROWSER_BASED_DIRS = [
+ "resource://devtools/client/inspector/boxmodel",
+ "resource://devtools/client/inspector/changes",
+ "resource://devtools/client/inspector/computed",
+ "resource://devtools/client/inspector/events",
+ "resource://devtools/client/inspector/flexbox",
+ "resource://devtools/client/inspector/fonts",
+ "resource://devtools/client/inspector/grids",
+ "resource://devtools/client/inspector/layout",
+ "resource://devtools/client/inspector/markup",
+ "resource://devtools/client/jsonview",
+ "resource://devtools/client/netmonitor/src/utils",
+ "resource://devtools/client/shared/fluent-l10n",
+ "resource://devtools/client/shared/redux",
+ "resource://devtools/client/shared/vendor",
+];
+
+const COMMON_LIBRARY_DIRS = ["resource://devtools/client/shared/vendor"];
+
+// Any directory that matches the following regular expression
+// is also considered as browser based module directory.
+// ('resource://devtools/client/.*/components/')
+//
+// An example:
+// * `resource://devtools/client/inspector/components`
+// * `resource://devtools/client/inspector/shared/components`
+const browserBasedDirsRegExp =
+ /^resource\:\/\/devtools\/client\/\S*\/components\//;
+
+/*
+ * Create a loader to be used in a browser environment. This evaluates
+ * modules in their own environment, but sets window (the normal
+ * global object) as the sandbox prototype, so when a variable is not
+ * defined it checks `window` before throwing an error. This makes all
+ * browser APIs available to modules by default, like a normal browser
+ * environment, but modules are still evaluated in their own scope.
+ *
+ * Another very important feature of this loader is that it *only*
+ * deals with modules loaded from under `baseURI`. Anything loaded
+ * outside of that path will still be loaded from the devtools loader,
+ * so all system modules are still shared and cached across instances.
+ * An exception to this is anything under
+ * `devtools/client/shared/{vendor/components}`, which is where shared libraries
+ * and React components live that should be evaluated in a browser environment.
+ *
+ * @param string baseURI
+ * Base path to load modules from. If null or undefined, only
+ * the shared vendor/components modules are loaded with the browser
+ * loader.
+ * @param Object window
+ * The window instance to evaluate modules within
+ * @param Boolean useOnlyShared
+ * If true, ignores `baseURI` and only loads the shared
+ * BROWSER_BASED_DIRS via BrowserLoader.
+ * @return Object
+ * An object with two properties:
+ * - loader: the Loader instance
+ * - require: a function to require modules with
+ */
+function BrowserLoader(options) {
+ const browserLoaderBuilder = new BrowserLoaderBuilder(options);
+ return {
+ loader: browserLoaderBuilder.loader,
+ require: browserLoaderBuilder.require,
+ };
+}
+
+/**
+ * Private class used to build the Loader instance and require method returned
+ * by BrowserLoader(baseURI, window).
+ *
+ * @param string baseURI
+ * Base path to load modules from.
+ * @param Function commonLibRequire
+ * Require function that should be used to load common libraries, like React.
+ * Allows for sharing common modules between tools, instead of loading a new
+ * instance into each tool. For example, pass "toolbox.browserRequire" here.
+ * @param Boolean useOnlyShared
+ * If true, ignores `baseURI` and only loads the shared
+ * BROWSER_BASED_DIRS via BrowserLoader.
+ * @param Object window
+ * The window instance to evaluate modules within
+ */
+function BrowserLoaderBuilder({
+ baseURI,
+ commonLibRequire,
+ useOnlyShared,
+ window,
+}) {
+ assert(
+ !!baseURI !== !!useOnlyShared,
+ "Cannot use both `baseURI` and `useOnlyShared`."
+ );
+
+ const loaderOptions = devtoolsRequire("@loader/options");
+
+ const opts = {
+ sandboxPrototype: window,
+ sandboxName: "DevTools (UI loader)",
+ paths: loaderOptions.paths,
+ invisibleToDebugger: loaderOptions.invisibleToDebugger,
+ // Make sure `define` function exists. This allows defining some modules
+ // in AMD format while retaining CommonJS compatibility through this hook.
+ // JSON Viewer needs modules in AMD format, as it currently uses RequireJS
+ // from a content document and can't access our usual loaders. So, any
+ // modules shared with the JSON Viewer should include a define wrapper:
+ //
+ // // Make this available to both AMD and CJS environments
+ // define(function(require, exports, module) {
+ // ... code ...
+ // });
+ //
+ // Bug 1248830 will work out a better plan here for our content module
+ // loading needs, especially as we head towards devtools.html.
+ supportAMDModules: true,
+ requireHook: (id, require) => {
+ // If |id| requires special handling, simply defer to devtools
+ // immediately.
+ if (loader.isLoaderPluginId(id)) {
+ return devtoolsRequire(id);
+ }
+
+ const uri = require.resolve(id);
+
+ // The mocks can be set from tests using browser-loader-mocks.js setMockedModule().
+ // If there is an entry for a given uri in the `mocks` object, return it instead of
+ // requiring the module.
+ if (flags.testing && lazy.getMockedModule(uri)) {
+ return lazy.getMockedModule(uri);
+ }
+
+ if (
+ commonLibRequire &&
+ COMMON_LIBRARY_DIRS.some(dir => uri.startsWith(dir))
+ ) {
+ return commonLibRequire(uri);
+ }
+
+ // Check if the URI matches one of hardcoded paths or a regexp.
+ const isBrowserDir =
+ BROWSER_BASED_DIRS.some(dir => uri.startsWith(dir)) ||
+ uri.match(browserBasedDirsRegExp) != null;
+
+ if ((useOnlyShared || !uri.startsWith(baseURI)) && !isBrowserDir) {
+ return devtoolsRequire(uri);
+ }
+
+ return require(uri);
+ },
+ globals: {
+ // Allow modules to use the window's console to ensure logs appear in a
+ // tab toolbox, if one exists, instead of just the browser console.
+ console: window.console,
+ // Allow modules to use the DevToolsLoader lazy loading helpers.
+ loader: {
+ lazyGetter: loader.lazyGetter,
+ lazyServiceGetter: loader.lazyServiceGetter,
+ lazyRequireGetter: this.lazyRequireGetter.bind(this),
+ },
+ },
+ };
+
+ const mainModule = BaseLoader.Module(baseURI, joinURI(baseURI, "main.js"));
+ this.loader = BaseLoader.Loader(opts);
+ // When running tests, expose the BrowserLoader instance for metrics tests.
+ if (flags.testing) {
+ window.getBrowserLoaderForWindow = () => this;
+ }
+ this.require = BaseLoader.Require(this.loader, mainModule);
+}
+
+BrowserLoaderBuilder.prototype = {
+ /**
+ * Define a getter property on the given object that requires the given
+ * module. This enables delaying importing modules until the module is
+ * actually used.
+ *
+ * Several getters can be defined at once by providing an array of
+ * properties and enabling destructuring.
+ *
+ * @param { Object } obj
+ * The object to define the property on.
+ * @param { String | Array<String> } properties
+ * String: Name of the property for the getter.
+ * Array<String>: When destructure is true, properties can be an array of
+ * strings to create several getters at once.
+ * @param { String } module
+ * The module path.
+ * @param { Boolean } destructure
+ * Pass true if the property name is a member of the module's exports.
+ */
+ lazyRequireGetter(obj, properties, module, destructure) {
+ if (Array.isArray(properties) && !destructure) {
+ throw new Error(
+ "Pass destructure=true to call lazyRequireGetter with an array of properties"
+ );
+ }
+
+ if (!Array.isArray(properties)) {
+ properties = [properties];
+ }
+
+ for (const property of properties) {
+ loader.lazyGetter(obj, property, () => {
+ return destructure
+ ? this.require(module)[property]
+ : this.require(module || property);
+ });
+ }
+ },
+};
+
+this.BrowserLoader = BrowserLoader;
+
+this.EXPORTED_SYMBOLS = ["BrowserLoader"];