404 lines
12 KiB
JavaScript
404 lines
12 KiB
JavaScript
/*
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* SJS 2.0.0
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* Minimal SystemJS Build
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*/
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(function () {
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const hasSelf = typeof self !== 'undefined';
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const envGlobal = hasSelf ? self : global;
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let baseUrl;
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if (typeof location !== 'undefined') {
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baseUrl = location.href.split('#')[0].split('?')[0];
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const lastSepIndex = baseUrl.lastIndexOf('/');
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if (lastSepIndex !== -1)
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baseUrl = baseUrl.slice(0, lastSepIndex + 1);
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}
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const backslashRegEx = /\\/g;
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function resolveIfNotPlainOrUrl (relUrl, parentUrl) {
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if (relUrl.indexOf('\\') !== -1)
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relUrl = relUrl.replace(backslashRegEx, '/');
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// protocol-relative
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if (relUrl[0] === '/' && relUrl[1] === '/') {
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return parentUrl.slice(0, parentUrl.indexOf(':') + 1) + relUrl;
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}
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// relative-url
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else if (relUrl[0] === '.' && (relUrl[1] === '/' || relUrl[1] === '.' && (relUrl[2] === '/' || relUrl.length === 2 && (relUrl += '/')) ||
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relUrl.length === 1 && (relUrl += '/')) ||
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relUrl[0] === '/') {
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const parentProtocol = parentUrl.slice(0, parentUrl.indexOf(':') + 1);
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// Disabled, but these cases will give inconsistent results for deep backtracking
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//if (parentUrl[parentProtocol.length] !== '/')
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// throw new Error('Cannot resolve');
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// read pathname from parent URL
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// pathname taken to be part after leading "/"
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let pathname;
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if (parentUrl[parentProtocol.length + 1] === '/') {
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// resolving to a :// so we need to read out the auth and host
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if (parentProtocol !== 'file:') {
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pathname = parentUrl.slice(parentProtocol.length + 2);
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pathname = pathname.slice(pathname.indexOf('/') + 1);
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}
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else {
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pathname = parentUrl.slice(8);
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}
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}
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else {
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// resolving to :/ so pathname is the /... part
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pathname = parentUrl.slice(parentProtocol.length + 1);
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}
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if (relUrl[0] === '/')
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return parentUrl.slice(0, parentUrl.length - pathname.length - 1) + relUrl;
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// join together and split for removal of .. and . segments
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// looping the string instead of anything fancy for perf reasons
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// '../../../../../z' resolved to 'x/y' is just 'z'
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const segmented = pathname.slice(0, pathname.lastIndexOf('/') + 1) + relUrl;
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const output = [];
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let segmentIndex = -1;
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for (let i = 0; i < segmented.length; i++) {
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// busy reading a segment - only terminate on '/'
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if (segmentIndex !== -1) {
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if (segmented[i] === '/') {
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output.push(segmented.slice(segmentIndex, i + 1));
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segmentIndex = -1;
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}
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}
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// new segment - check if it is relative
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else if (segmented[i] === '.') {
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// ../ segment
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if (segmented[i + 1] === '.' && (segmented[i + 2] === '/' || i + 2 === segmented.length)) {
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output.pop();
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i += 2;
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}
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// ./ segment
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else if (segmented[i + 1] === '/' || i + 1 === segmented.length) {
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i += 1;
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}
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else {
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// the start of a new segment as below
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segmentIndex = i;
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}
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}
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// it is the start of a new segment
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else {
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segmentIndex = i;
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}
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}
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// finish reading out the last segment
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if (segmentIndex !== -1)
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output.push(segmented.slice(segmentIndex));
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return parentUrl.slice(0, parentUrl.length - pathname.length) + output.join('');
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}
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}
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/*
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* SystemJS Core
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*
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* Provides
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* - System.import
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* - System.register support for
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* live bindings, function hoisting through circular references,
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* reexports, dynamic import, import.meta.url, top-level await
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* - System.getRegister to get the registration
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* - Symbol.toStringTag support in Module objects
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* - Hookable System.createContext to customize import.meta
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* - System.onload(id, err?) handler for tracing / hot-reloading
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*
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* Core comes with no System.prototype.resolve or
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* System.prototype.instantiate implementations
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*/
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const hasSymbol = typeof Symbol !== 'undefined';
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const toStringTag = hasSymbol && Symbol.toStringTag;
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const REGISTRY = hasSymbol ? Symbol() : '@';
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function SystemJS () {
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this[REGISTRY] = {};
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}
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const systemJSPrototype = SystemJS.prototype;
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systemJSPrototype.import = function (id, parentUrl) {
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const loader = this;
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return Promise.resolve(loader.resolve(id, parentUrl))
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.then(function (id) {
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const load = getOrCreateLoad(loader, id);
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return load.C || topLevelLoad(loader, load);
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});
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};
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// Hookable createContext function -> allowing eg custom import meta
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systemJSPrototype.createContext = function (parentId) {
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return {
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url: parentId
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};
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};
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let lastRegister;
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systemJSPrototype.register = function (deps, declare) {
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lastRegister = [deps, declare];
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};
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/*
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* getRegister provides the last anonymous System.register call
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*/
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systemJSPrototype.getRegister = function () {
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const _lastRegister = lastRegister;
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lastRegister = undefined;
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return _lastRegister;
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};
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function getOrCreateLoad (loader, id, firstParentUrl) {
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let load = loader[REGISTRY][id];
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if (load)
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return load;
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const importerSetters = [];
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const ns = Object.create(null);
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if (toStringTag)
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Object.defineProperty(ns, toStringTag, { value: 'Module' });
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let instantiatePromise = Promise.resolve()
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.then(function () {
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return loader.instantiate(id, firstParentUrl);
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})
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.then(function (registration) {
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if (!registration)
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throw new Error('Module ' + id + ' did not instantiate');
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function _export (name, value) {
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// note if we have hoisted exports (including reexports)
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load.h = true;
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let changed = false;
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if (typeof name !== 'object') {
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if (!(name in ns) || ns[name] !== value) {
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ns[name] = value;
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changed = true;
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}
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}
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else {
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for (let p in name) {
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let value = name[p];
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if (!(p in ns) || ns[p] !== value) {
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ns[p] = value;
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changed = true;
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}
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}
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}
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if (changed)
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for (let i = 0; i < importerSetters.length; i++)
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importerSetters[i](ns);
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return value;
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}
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const declared = registration[1](_export, registration[1].length === 2 ? {
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import: function (importId) {
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return loader.import(importId, id);
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},
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meta: loader.createContext(id)
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} : undefined);
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load.e = declared.execute || function () {};
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return [registration[0], declared.setters || []];
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});
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const linkPromise = instantiatePromise
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.then(function (instantiation) {
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return Promise.all(instantiation[0].map(function (dep, i) {
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const setter = instantiation[1][i];
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return Promise.resolve(loader.resolve(dep, id))
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.then(function (depId) {
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const depLoad = getOrCreateLoad(loader, depId, id);
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// depLoad.I may be undefined for already-evaluated
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return Promise.resolve(depLoad.I)
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.then(function () {
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if (setter) {
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depLoad.i.push(setter);
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// only run early setters when there are hoisted exports of that module
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// the timing works here as pending hoisted export calls will trigger through importerSetters
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if (depLoad.h || !depLoad.I)
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setter(depLoad.n);
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}
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return depLoad;
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});
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})
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}))
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.then(function (depLoads) {
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load.d = depLoads;
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});
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});
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// disable unhandled rejections
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linkPromise.catch(function () {});
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// Captial letter = a promise function
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return load = loader[REGISTRY][id] = {
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id: id,
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// importerSetters, the setters functions registered to this dependency
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// we retain this to add more later
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i: importerSetters,
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// module namespace object
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n: ns,
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// instantiate
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I: instantiatePromise,
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// link
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L: linkPromise,
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// whether it has hoisted exports
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h: false,
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// On instantiate completion we have populated:
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// dependency load records
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d: undefined,
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// execution function
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// set to NULL immediately after execution (or on any failure) to indicate execution has happened
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// in such a case, pC should be used, and pLo, pLi will be emptied
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e: undefined,
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// On execution we have populated:
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// the execution error if any
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eE: undefined,
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// in the case of TLA, the execution promise
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E: undefined,
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// On execution, pLi, pLo, e cleared
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// Promise for top-level completion
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C: undefined
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};
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}
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function instantiateAll (loader, load, loaded) {
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if (!loaded[load.id]) {
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loaded[load.id] = true;
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// load.L may be undefined for already-instantiated
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return Promise.resolve(load.L)
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.then(function () {
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return Promise.all(load.d.map(function (dep) {
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return instantiateAll(loader, dep, loaded);
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}));
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})
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}
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}
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function topLevelLoad (loader, load) {
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return load.C = instantiateAll(loader, load, {})
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.then(function () {
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return postOrderExec(loader, load, {});
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})
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.then(function () {
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return load.n;
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});
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}
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// the closest we can get to call(undefined)
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const nullContext = Object.freeze(Object.create(null));
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// returns a promise if and only if a top-level await subgraph
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// throws on sync errors
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function postOrderExec (loader, load, seen) {
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if (seen[load.id])
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return;
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seen[load.id] = true;
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if (!load.e) {
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if (load.eE)
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throw load.eE;
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if (load.E)
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return load.E;
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return;
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}
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// deps execute first, unless circular
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let depLoadPromises;
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load.d.forEach(function (depLoad) {
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{
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const depLoadPromise = postOrderExec(loader, depLoad, seen);
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if (depLoadPromise)
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(depLoadPromises = depLoadPromises || []).push(depLoadPromise);
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}
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});
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if (depLoadPromises) {
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return load.E = Promise.all(depLoadPromises).then(doExec);
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}
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return doExec();
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function doExec () {
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try {
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let execPromise = load.e.call(nullContext);
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if (execPromise) {
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execPromise.then(function () {
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load.C = load.n;
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load.E = null;
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});
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execPromise.catch(function () {});
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return load.E = load.E || execPromise;
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}
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// (should be a promise, but a minify optimization to leave out Promise.resolve)
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load.C = load.n;
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}
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catch (err) {
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load.eE = err;
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throw err;
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}
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finally {
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load.L = load.I = undefined;
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load.e = null;
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}
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}
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}
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envGlobal.System = new SystemJS();
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/*
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* Supports loading System.register via script tag injection
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*/
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let err$1;
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if (typeof window !== 'undefined')
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window.addEventListener('error', function (e) {
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err$1 = e.error;
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});
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const systemRegister = systemJSPrototype.register;
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systemJSPrototype.register = function (deps, declare) {
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err$1 = undefined;
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systemRegister.call(this, deps, declare);
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};
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systemJSPrototype.instantiate = function (url, firstParentUrl) {
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const loader = this;
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return new Promise(function (resolve, reject) {
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const script = document.createElement('script');
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script.charset = 'utf-8';
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script.async = true;
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script.addEventListener('error', function () {
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reject(new Error('Error loading ' + url + (firstParentUrl ? ' from ' + firstParentUrl : '')));
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});
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script.addEventListener('load', function () {
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document.head.removeChild(script);
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// Note URL normalization issues are going to be a careful concern here
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if (err$1)
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return reject(err$1);
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else
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resolve(loader.getRegister());
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});
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script.src = url;
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document.head.appendChild(script);
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});
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};
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systemJSPrototype.resolve = function (id, parentUrl) {
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const resolved = resolveIfNotPlainOrUrl(id, parentUrl || baseUrl);
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if (!resolved) {
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if (id.indexOf(':') !== -1)
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return id;
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throw new Error('Cannot resolve "' + id + (parentUrl ? '" from ' + parentUrl : '"'));
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}
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return resolved;
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};
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}());
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