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87 lines
2.6 KiB
87 lines
2.6 KiB
/**
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* Copyright 2018 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// If the loader is already loaded, just stop.
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if (!self.<%- amdFunctionName %>) {
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const singleRequire = name => {
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if (name !== 'require') {
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name = name + '.js';
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}
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let promise = Promise.resolve();
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if (!registry[name]) {
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<% if (useEval) { %>
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promise = fetch(name)
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.then(resp => resp.text())
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.then(code => eval(code));
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<% } else { %>
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promise = new Promise(async resolve => {
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if ("document" in self) {
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const script = document.createElement("script");
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script.src = name;
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document.head.appendChild(script);
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script.onload = resolve;
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} else {
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importScripts(name);
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resolve();
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}
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});
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<% } %>
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}
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return promise.then(() => {
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if (!registry[name]) {
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throw new Error(`Module ${name} didn’t register its module`);
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}
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return registry[name];
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});
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};
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const require = (names, resolve) => {
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Promise.all(names.map(singleRequire))
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.then(modules => resolve(modules.length === 1 ? modules[0] : modules));
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};
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const registry = {
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require: Promise.resolve(require)
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};
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self.<%- amdFunctionName %> = (moduleName, depsNames, factory) => {
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if (registry[moduleName]) {
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// Module is already loading or loaded.
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return;
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}
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registry[moduleName] = Promise.resolve().then(() => {
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let exports = {};
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const module = {
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uri: location.origin + moduleName.slice(1)
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};
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return Promise.all(
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depsNames.map(depName => {
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switch(depName) {
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case "exports":
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return exports;
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case "module":
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return module;
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default:
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return singleRequire(depName);
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}
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})
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).then(deps => {
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const facValue = factory(...deps);
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if(!exports.default) {
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exports.default = facValue;
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}
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return exports;
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});
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});
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};
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}
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