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68 lines
2.4 KiB
JavaScript
68 lines
2.4 KiB
JavaScript
'use strict';
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/* Whether the browser is Chromium-based with MojoJS enabled */
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const isChromiumBased = 'MojoInterfaceInterceptor' in self;
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/* Whether the browser is WebKit-based with internal test-only API enabled */
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const isWebKitBased = !isChromiumBased && 'internals' in self;
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/**
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* Loads a script in a window or worker.
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*
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* @param {string} path - A script path
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* @returns {Promise}
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*/
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function loadScript(path) {
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if (typeof document === 'undefined') {
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// Workers (importScripts is synchronous and may throw.)
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importScripts(path);
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return Promise.resolve();
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} else {
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// Window
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const script = document.createElement('script');
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script.src = path;
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script.async = false;
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const p = new Promise((resolve, reject) => {
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script.onload = () => { resolve(); };
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script.onerror = e => { reject(e); };
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})
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document.head.appendChild(script);
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return p;
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}
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}
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/**
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* A helper for Chromium-based browsers to load Mojo JS bindingds
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*
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* This is an async function that works in both workers and windows. It first
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* loads mojo_bindings.js, disables automatic dependency loading, and loads all
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* resources sequentially. The promise resolves if everything loads
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* successfully, or rejects if any exception is raised. If testharness.js is
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* used, an uncaught exception will terminate the test with a harness error
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* (unless `allow_uncaught_exception` is true), which is usually the desired
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* behaviour. Only call this function if isChromiumBased === true.
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*
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* @param {Array.<string>} resources - A list of scripts to load: Mojo JS
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* bindings should be of the form '/gen/../*.mojom.js', the ordering of which
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* does not matter. Do not include mojo_bindings.js in this list. You may
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* include other non-mojom.js scripts for convenience.
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* @returns {Promise}
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*/
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async function loadMojoResources(resources) {
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if (!isChromiumBased) {
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throw new Error('MojoJS not enabled; start Chrome with --enable-blink-features=MojoJS,MojoJSTest');
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}
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if (resources.length == 0) {
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return;
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}
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// We want to load mojo_bindings.js separately to set mojo.config.
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if (resources.some(p => p.endsWith('/mojo_bindings.js'))) {
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throw new Error('Do not load mojo_bindings.js explicitly.');
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}
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await loadScript('/gen/layout_test_data/mojo/public/js/mojo_bindings.js');
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mojo.config.autoLoadMojomDeps = false;
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for (const path of resources) {
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await loadScript(path);
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}
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}
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