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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * Loads JSON, CSS, Wasm module types based on file extensions | ||
| * Supports application/javascript falling back to JS eval | ||
| */ | ||
| import { systemJSPrototype } from '../system-core'; | ||
| const instantiate = systemJSPrototype.instantiate; | ||
| systemJSPrototype.instantiate = function (url, parent) { | ||
| const loader = this; | ||
| const ext = url.slice(url.lastIndexOf('.')); | ||
| switch (ext) { | ||
| case '.css': | ||
| return loadDynamicModule(function (_export, source) { | ||
| // Relies on a Constructable Stylesheet polyfill | ||
| const stylesheet = new CSSStyleSheet(); | ||
| stylesheet.replaceSync(source); | ||
| _export('default', stylesheet); | ||
| }); | ||
| case '.html': | ||
| return getSourceRes().then(function (res) { | ||
| return maybeJSFallback(res) || loadError("'.html' modules not implemented"); | ||
| }); | ||
| case '.json': | ||
| return loadDynamicModule(function (_export, source) { | ||
| _export('default', JSON.parse(source)); | ||
| }); | ||
| case '.wasm': | ||
| return getSourceRes().then(function (res) { | ||
| return maybeJSFallback(res) || | ||
| (WebAssembly.compileStreaming ? WebAssembly.compileStreaming(res) : res.arrayBuffer().then(WebAssembly.compile)); | ||
| }) | ||
| .then(function (module) { | ||
| const deps = []; | ||
| const setters = []; | ||
| const importObj = {}; | ||
|
|
||
| // we can only set imports if supported (eg early Safari doesnt support) | ||
| if (WebAssembly.Module.imports) | ||
| WebAssembly.Module.imports(module).forEach(function (impt) { | ||
| const key = impt.module; | ||
| if (deps.indexOf(key) === -1) { | ||
| deps.push(key); | ||
| setters.push(function (m) { | ||
| importObj[key] = m; | ||
| }); | ||
| } | ||
| }); | ||
|
|
||
| return [deps, function (_export) { | ||
| return { | ||
| setters: setters, | ||
| execute: function () { | ||
| return WebAssembly.instantiate(module, importObj) | ||
| .then(function (instance) { | ||
| _export(instance.exports); | ||
| }); | ||
| } | ||
| }; | ||
| }]; | ||
| }); | ||
| } | ||
| return instantiate.apply(this, arguments); | ||
|
|
||
| function getSourceRes () { | ||
| return fetch(url).then(function (res) { | ||
| if (!res.ok) | ||
| loadError(res.status + ' ' + res.statusText); | ||
| return res; | ||
| }); | ||
| } | ||
| function maybeJSFallback (res) { | ||
| const contentType = res.headers.get('content-type'); | ||
| // if the resource is sent as application/javascript, support eval-based execution | ||
| if (contentType && contentType.match(/^application\/javascript(;|$)/)) { | ||
| return res.text().then(function (source) { | ||
| (0, eval)(source); | ||
| return loader.getRegister(); | ||
| }); | ||
| } | ||
| } | ||
| function loadDynamicModule (createExec) { | ||
| return getSourceRes().then(function (res) { | ||
| return maybeJSFallback(res) || res.text().then(function (source) { | ||
| return [[], function (_export) { | ||
| return { execute: createExec(_export, source) }; | ||
| }]; | ||
| }); | ||
| }); | ||
| } | ||
| function loadError (msg) { | ||
| throw Error(msg + ', loading ' + url + (parent ? ' from ' + parent : '')); | ||
| } | ||
| }; |
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