es-module-loader/src/loader.js at 0.17 · ModuleLoader/es-module-loader · GitHub

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*********************************************************************************************

Dynamic Module Loader Polyfill

- Implemented exactly to the former 2014-08-24 ES6 Specification Draft Rev 27, Section 15

http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts#august_24_2014_draft_rev_27

- Functions are commented with their spec numbers, with spec differences commented.

- Spec bugs are commented in this code with links.

- Abstract functions have been combined where possible, and their associated functions

commented.

- Realm implementation is entirely omitted.

*********************************************************************************************

function Module() {}

// http://www.ecma-international.org/ecma-262/6.0/#sec-@@tostringtag

defineProperty(Module.prototype, 'toString', {

value: function() {

return 'Module';

}

});

function Loader(options) {

this._loader = {

loaderObj: this,

loads: [],

modules: {},

importPromises: {},

moduleRecords: {}

};

// 26.3.3.6

defineProperty(this, 'global', {

get: function() {

return __global;

}

});

// 26.3.3.13 realm not implemented

}

(function() {

// Some Helpers

// logs a linkset snapshot for debugging

/* function snapshot(loader) {

console.log('---Snapshot---');

for (var i = 0; i < loader.loads.length; i++) {

var load = loader.loads[i];

var linkSetLog = ' ' + load.name + ' (' + load.status + '): ';

for (var j = 0; j < load.linkSets.length; j++) {

linkSetLog += '{' + logloads(load.linkSets[j].loads) + '} ';

}

console.log(linkSetLog);

}

console.log('');

}

function logloads(loads) {

var log = '';

for (var k = 0; k < loads.length; k++)

log += loads[k].name + (k != loads.length - 1 ? ' ' : '');

return log;

} */

/* function checkInvariants() {

// see https://bugs.ecmascript.org/show_bug.cgi?id=2603#c1

var loads = System._loader.loads;

var linkSets = [];

for (var i = 0; i < loads.length; i++) {

var load = loads[i];

console.assert(load.status == 'loading' || load.status == 'loaded', 'Each load is loading or loaded');

for (var j = 0; j < load.linkSets.length; j++) {

var linkSet = load.linkSets[j];

for (var k = 0; k < linkSet.loads.length; k++)

console.assert(loads.indexOf(linkSet.loads[k]) != -1, 'linkSet loads are a subset of loader loads');

if (linkSets.indexOf(linkSet) == -1)

linkSets.push(linkSet);

}

for (var i = 0; i < loads.length; i++) {

var load = loads[i];

for (var j = 0; j < linkSets.length; j++) {

var linkSet = linkSets[j];

if (linkSet.loads.indexOf(load) != -1)

console.assert(load.linkSets.indexOf(linkSet) != -1, 'linkSet contains load -> load contains linkSet');

if (load.linkSets.indexOf(linkSet) != -1)

console.assert(linkSet.loads.indexOf(load) != -1, 'load contains linkSet -> linkSet contains load');

}

for (var i = 0; i < linkSets.length; i++) {

var linkSet = linkSets[i];

for (var j = 0; j < linkSet.loads.length; j++) {

var load = linkSet.loads[j];

for (var k = 0; k < load.dependencies.length; k++) {

var depName = load.dependencies[k].value;

var depLoad;

for (var l = 0; l < loads.length; l++) {

if (loads[l].name != depName)

continue;

depLoad = loads[l];

break;

}

// loading records are allowed not to have their dependencies yet

// if (load.status != 'loading')

// console.assert(depLoad, 'depLoad found');

// console.assert(linkSet.loads.indexOf(depLoad) != -1, 'linkset contains all dependencies');

}

} */

// 15.2.3 - Runtime Semantics: Loader State

// 15.2.3.11

function createLoaderLoad(object) {

return {

// modules is an object for ES5 implementation

modules: {},

loads: [],

loaderObj: object

};

}

// 15.2.3.2 Load Records and LoadRequest Objects

var anonCnt = 0;

// 15.2.3.2.1

function createLoad(name) {

return {

status: 'loading',

linkSets: [],

dependencies: [],

metadata: {}

};

}

// 15.2.3.2.2 createLoadRequestObject, absorbed into calling functions

// 15.2.4

// 15.2.4.1

function loadModule(loader, name, options) {

return new Promise(asyncStartLoadPartwayThrough({

step: options.address ? 'fetch' : 'locate',

loader: loader,

moduleName: name,

// allow metadata for import https://bugs.ecmascript.org/show_bug.cgi?id=3091

moduleMetadata: options && options.metadata || {},

moduleSource: options.source,

moduleAddress: options.address

}));

}

// 15.2.4.2

function requestLoad(loader, request, refererName, refererAddress) {

// 15.2.4.2.1 CallNormalize

return new Promise(function(resolve, reject) {

resolve(loader.loaderObj.normalize(request, refererName, refererAddress));

})

// 15.2.4.2.2 GetOrCreateLoad

.then(function(name) {

var load;

if (loader.modules[name]) {

load = createLoad(name);

load.status = 'linked';

// https://bugs.ecmascript.org/show_bug.cgi?id=2795

load.module = loader.modules[name];

return load;

}

for (var i = 0, l = loader.loads.length; i < l; i++) {

load = loader.loads[i];

if (load.name != name)

continue;

return load;

}

load = createLoad(name);

loader.loads.push(load);

proceedToLocate(loader, load);

return load;

});

}

// 15.2.4.3

function proceedToLocate(loader, load) {

proceedToFetch(loader, load,

Promise.resolve()

// 15.2.4.3.1 CallLocate

.then(function() {

return loader.loaderObj.locate({ name: load.name, metadata: load.metadata });

})

);

}

// 15.2.4.4

function proceedToFetch(loader, load, p) {

proceedToTranslate(loader, load,

// 15.2.4.4.1 CallFetch

.then(function(address) {

// adjusted, see https://bugs.ecmascript.org/show_bug.cgi?id=2602

if (load.status != 'loading')

return;

load.address = address;

return loader.loaderObj.fetch({ name: load.name, metadata: load.metadata, address: address });

})

);

}

// 15.2.4.5

function proceedToTranslate(loader, load, p) {

// 15.2.4.5.1 CallTranslate

.then(function(source) {

if (load.status != 'loading')

return;

load.address = load.address || load.name;

return Promise.resolve(loader.loaderObj.translate({ name: load.name, metadata: load.metadata, address: load.address, source: source }))

// 15.2.4.5.2 CallInstantiate

.then(function(source) {

load.source = source;

return loader.loaderObj.instantiate({ name: load.name, metadata: load.metadata, address: load.address, source: source });

})

// 15.2.4.5.3 InstantiateSucceeded

.then(function(instantiateResult) {

if (instantiateResult === undefined) {

// instead of load.kind, use load.isDeclarative

load.isDeclarative = true;

return transpile.call(loader.loaderObj, load)

.then(function(transpiled) {

// Hijack System.register to set declare function

var curSystem = __global.System;

var curRegister = curSystem.register;

curSystem.register = function(name, deps, declare) {

if (typeof name != 'string') {

declare = deps;

deps = name;

}

// store the registered declaration as load.declare

// store the deps as load.deps

load.declare = declare;

load.depsList = deps;

}

// empty {} context is closest to undefined 'this' we can get

__eval(transpiled, load.address, {});

curSystem.register = curRegister;

});

}

else if (typeof instantiateResult == 'object') {

load.depsList = instantiateResult.deps || [];

load.execute = instantiateResult.execute;

load.isDeclarative = false;

}

else

throw TypeError('Invalid instantiate return value');

})

// 15.2.4.6 ProcessLoadDependencies

.then(function() {

load.dependencies = [];

var depsList = load.depsList;

var loadPromises = [];

for (var i = 0, l = depsList.length; i < l; i++) (function(request, index) {

loadPromises.push(

requestLoad(loader, request, load.name, load.address)

// 15.2.4.6.1 AddDependencyLoad (load is parentLoad)

.then(function(depLoad) {

// adjusted from spec to maintain dependency order

// this is due to the System.register internal implementation needs

load.dependencies[index] = {

key: request,

value: depLoad.name

};

if (depLoad.status != 'linked') {

var linkSets = load.linkSets.concat([]);

for (var i = 0, l = linkSets.length; i < l; i++)

addLoadToLinkSet(linkSets[i], depLoad);

}

// console.log('AddDependencyLoad ' + depLoad.name + ' for ' + load.name);

// snapshot(loader);

})

);

})(depsList[i], i);

return Promise.all(loadPromises);

})

// 15.2.4.6.2 LoadSucceeded

.then(function() {

// console.log('LoadSucceeded ' + load.name);

// snapshot(loader);

console.assert(load.status == 'loading', 'is loading');

load.status = 'loaded';

var linkSets = load.linkSets.concat([]);

for (var i = 0, l = linkSets.length; i < l; i++)

updateLinkSetOnLoad(linkSets[i], load);

});

})

// 15.2.4.5.4 LoadFailed

['catch'](function(exc) {

load.status = 'failed';

load.exception = exc;

var linkSets = load.linkSets.concat([]);

for (var i = 0, l = linkSets.length; i < l; i++) {

linkSetFailed(linkSets[i], load, exc);

}

console.assert(load.linkSets.length == 0, 'linkSets not removed');

});

}

// 15.2.4.7 PromiseOfStartLoadPartwayThrough absorbed into calling functions

// 15.2.4.7.1

function asyncStartLoadPartwayThrough(stepState) {

return function(resolve, reject) {

var loader = stepState.loader;

var name = stepState.moduleName;

var step = stepState.step;

if (loader.modules[name])

throw new TypeError('"' + name + '" already exists in the module table');

// adjusted to pick up existing loads

var existingLoad;

for (var i = 0, l = loader.loads.length; i < l; i++) {

if (loader.loads[i].name == name) {

existingLoad = loader.loads[i];

if (step == 'translate' && !existingLoad.source) {

existingLoad.address = stepState.moduleAddress;

proceedToTranslate(loader, existingLoad, Promise.resolve(stepState.moduleSource));

}

// a primary load -> use that existing linkset if it is for the direct load here

// otherwise create a new linkset unit

if (existingLoad.linkSets.length && existingLoad.linkSets[0].loads[0].name == existingLoad.name)

return existingLoad.linkSets[0].done.then(function() {

resolve(existingLoad);

});

}

var load = existingLoad || createLoad(name);

load.metadata = stepState.moduleMetadata;

var linkSet = createLinkSet(loader, load);

loader.loads.push(load);

resolve(linkSet.done);

if (step == 'locate')

proceedToLocate(loader, load);

else if (step == 'fetch')

proceedToFetch(loader, load, Promise.resolve(stepState.moduleAddress));

else {

console.assert(step == 'translate', 'translate step');

load.address = stepState.moduleAddress;

proceedToTranslate(loader, load, Promise.resolve(stepState.moduleSource));

}

// Declarative linking functions run through alternative implementation:

// 15.2.5.1.1 CreateModuleLinkageRecord not implemented

// 15.2.5.1.2 LookupExport not implemented

// 15.2.5.1.3 LookupModuleDependency not implemented

// 15.2.5.2.1

function createLinkSet(loader, startingLoad) {

var linkSet = {

loader: loader,

loads: [],

startingLoad: startingLoad, // added see spec bug https://bugs.ecmascript.org/show_bug.cgi?id=2995

loadingCount: 0

};

linkSet.done = new Promise(function(resolve, reject) {

linkSet.resolve = resolve;

linkSet.reject = reject;

});

addLoadToLinkSet(linkSet, startingLoad);

return linkSet;

}

// 15.2.5.2.2

function addLoadToLinkSet(linkSet, load) {

if (load.status == 'failed')

return;

for (var i = 0, l = linkSet.loads.length; i < l; i++)

if (linkSet.loads[i] == load)

return;

linkSet.loads.push(load);

load.linkSets.push(linkSet);

// adjustment, see https://bugs.ecmascript.org/show_bug.cgi?id=2603

if (load.status != 'loaded') {

linkSet.loadingCount++;

}

var loader = linkSet.loader;

for (var i = 0, l = load.dependencies.length; i < l; i++) {

if (!load.dependencies[i])

continue;

var name = load.dependencies[i].value;

if (loader.modules[name])

continue;

for (var j = 0, d = loader.loads.length; j < d; j++) {

if (loader.loads[j].name != name)

continue;

addLoadToLinkSet(linkSet, loader.loads[j]);

break;

}

// console.log('add to linkset ' + load.name);

// snapshot(linkSet.loader);

}

// linking errors can be generic or load-specific

// this is necessary for debugging info

function doLink(linkSet) {

var error = false;

try {

link(linkSet, function(load, exc) {

linkSetFailed(linkSet, load, exc);

error = true;

});

}

catch(e) {

linkSetFailed(linkSet, null, e);

error = true;

}

return error;

}

// 15.2.5.2.3

function updateLinkSetOnLoad(linkSet, load) {

// console.log('update linkset on load ' + load.name);

// snapshot(linkSet.loader);

console.assert(load.status == 'loaded' || load.status == 'linked', 'loaded or linked');

linkSet.loadingCount--;

if (linkSet.loadingCount > 0)

return;

// adjusted for spec bug https://bugs.ecmascript.org/show_bug.cgi?id=2995

var startingLoad = linkSet.startingLoad;

// non-executing link variation for loader tracing

// on the server. Not in spec.

/***/

if (linkSet.loader.loaderObj.execute === false) {

var loads = [].concat(linkSet.loads);

for (var i = 0, l = loads.length; i < l; i++) {

var load = loads[i];

load.module = !load.isDeclarative ? {

module: _newModule({})

} : {

module: _newModule({}),

evaluated: true

};

load.status = 'linked';

finishLoad(linkSet.loader, load);

}

return linkSet.resolve(startingLoad);

}

/***/

var abrupt = doLink(linkSet);

if (abrupt)

return;

console.assert(linkSet.loads.length == 0, 'loads cleared');

linkSet.resolve(startingLoad);

}

// 15.2.5.2.4

function linkSetFailed(linkSet, load, exc) {

var loader = linkSet.loader;

var requests;

checkError:

if (load) {

if (linkSet.loads[0].name == load.name) {

exc = addToError(exc, 'Error loading ' + load.name);

}

else {

for (var i = 0; i < linkSet.loads.length; i++) {

var pLoad = linkSet.loads[i];

for (var j = 0; j < pLoad.dependencies.length; j++) {

var dep = pLoad.dependencies[j];

if (dep.value == load.name) {

exc = addToError(exc, 'Error loading ' + load.name + ' as "' + dep.key + '" from ' + pLoad.name);

break checkError;

}

exc = addToError(exc, 'Error loading ' + load.name + ' from ' + linkSet.loads[0].name);

}

else {

exc = addToError(exc, 'Error linking ' + linkSet.loads[0].name);

}

var loads = linkSet.loads.concat([]);

for (var i = 0, l = loads.length; i < l; i++) {

var load = loads[i];

// store all failed load records

loader.loaderObj.failed = loader.loaderObj.failed || [];

if (indexOf.call(loader.loaderObj.failed, load) == -1)

loader.loaderObj.failed.push(load);

var linkIndex = indexOf.call(load.linkSets, linkSet);

console.assert(linkIndex != -1, 'link not present');

load.linkSets.splice(linkIndex, 1);

if (load.linkSets.length == 0) {

var globalLoadsIndex = indexOf.call(linkSet.loader.loads, load);

if (globalLoadsIndex != -1)

linkSet.loader.loads.splice(globalLoadsIndex, 1);

}

linkSet.reject(exc);

}

// 15.2.5.2.5

function finishLoad(loader, load) {

// add to global trace if tracing

if (loader.loaderObj.trace) {

if (!loader.loaderObj.loads)

loader.loaderObj.loads = {};

var depMap = {};

load.dependencies.forEach(function(dep) {

depMap[dep.key] = dep.value;

});

loader.loaderObj.loads[load.name] = {

deps: load.dependencies.map(function(dep){ return dep.key }),

depMap: depMap,

address: load.address,

metadata: load.metadata,

source: load.source,

kind: load.isDeclarative ? 'declarative' : 'dynamic'

};

}

// if not anonymous, add to the module table

if (load.name) {

console.assert(!loader.modules[load.name], 'load not in module table');

loader.modules[load.name] = load.module;

}

var loadIndex = indexOf.call(loader.loads, load);

if (loadIndex != -1)

loader.loads.splice(loadIndex, 1);

for (var i = 0, l = load.linkSets.length; i < l; i++) {

loadIndex = indexOf.call(load.linkSets[i].loads, load);

if (loadIndex != -1)

load.linkSets[i].loads.splice(loadIndex, 1);

}

load.linkSets.splice(0, load.linkSets.length);

}

function doDynamicExecute(linkSet, load, linkError) {

try {

var module = load.execute();

}

catch(e) {

linkError(load, e);

return;

}

if (!module || !(module instanceof Module))

linkError(load, new TypeError('Execution must define a Module instance'));

else

return module;

}

// 26.3 Loader

// 26.3.1.1

// defined at top

// importPromises adds ability to import a module twice without error - https://bugs.ecmascript.org/show_bug.cgi?id=2601

function createImportPromise(loader, name, promise) {

var importPromises = loader._loader.importPromises;

return importPromises[name] = promise.then(function(m) {

importPromises[name] = undefined;

return m;

}, function(e) {

importPromises[name] = undefined;

throw e;

});

}

Loader.prototype = {

// 26.3.3.1

constructor: Loader,

// 26.3.3.2

define: function(name, source, options) {

// check if already defined

if (this._loader.importPromises[name])

throw new TypeError('Module is already loading.');

return createImportPromise(this, name, new Promise(asyncStartLoadPartwayThrough({

step: 'translate',

loader: this._loader,

moduleName: name,

moduleMetadata: options && options.metadata || {},

moduleSource: source,

moduleAddress: options && options.address

})));

// 26.3.3.3

'delete': function(name) {

var loader = this._loader;

delete loader.importPromises[name];

delete loader.moduleRecords[name];

return loader.modules[name] ? delete loader.modules[name] : false;

// 26.3.3.4 entries not implemented

// 26.3.3.5

get: function(key) {

if (!this._loader.modules[key])

return;

doEnsureEvaluated(this._loader.modules[key], [], this);

return this._loader.modules[key].module;

// 26.3.3.7

has: function(name) {

return !!this._loader.modules[name];

// 26.3.3.8

'import': function(name, parentName, parentAddress) {

if (typeof parentName == 'object')

parentName = parentName.name;

// run normalize first

var loaderObj = this;

// added, see https://bugs.ecmascript.org/show_bug.cgi?id=2659

return Promise.resolve(loaderObj.normalize(name, parentName))

.then(function(name) {

var loader = loaderObj._loader;

if (loader.modules[name]) {

doEnsureEvaluated(loader.modules[name], [], loader._loader);

return loader.modules[name].module;

}

return loader.importPromises[name] || createImportPromise(loaderObj, name,

loadModule(loader, name, {})

.then(function(load) {

delete loader.importPromises[name];

return evaluateLoadedModule(loader, load);

}));

});

// 26.3.3.9 keys not implemented

// 26.3.3.10

load: function(name) {

var loader = this._loader;

if (loader.modules[name])

return Promise.resolve();

return loader.importPromises[name] || createImportPromise(this, name, new Promise(asyncStartLoadPartwayThrough({

step: 'locate',

loader: loader,

moduleName: name,

moduleMetadata: {},

moduleSource: undefined,

moduleAddress: undefined

}))

.then(function() {

delete loader.importPromises[name];

}));

// 26.3.3.11

module: function(source, options) {

var load = createLoad();

load.address = options && options.address;

var linkSet = createLinkSet(this._loader, load);

var sourcePromise = Promise.resolve(source);

var loader = this._loader;

var p = linkSet.done.then(function() {

return evaluateLoadedModule(loader, load);

});

proceedToTranslate(loader, load, sourcePromise);

return p;

// 26.3.3.12

newModule: function (obj) {

if (typeof obj != 'object')

throw new TypeError('Expected object');

var m = new Module();

var pNames = [];

if (Object.getOwnPropertyNames && obj != null)

pNames = Object.getOwnPropertyNames(obj);

else

for (var key in obj)

pNames.push(key);

for (var i = 0; i < pNames.length; i++) (function(key) {

defineProperty(m, key, {

configurable: false,

enumerable: true,

get: function () {

return obj[key];

set: function() {

throw new Error('Module exports cannot be changed externally.');

}

});

})(pNames[i]);

if (Object.freeze)

Object.freeze(m);

return m;

// 26.3.3.14

set: function(name, module) {

if (!(module instanceof Module))

throw new TypeError('Loader.set(' + name + ', module) must be a module');

this._loader.modules[name] = {

module: module

};

// 26.3.3.15 values not implemented

// 26.3.3.16 @@iterator not implemented

// 26.3.3.17 @@toStringTag not implemented

// 26.3.3.18.1

normalize: function(name, referrerName, referrerAddress) {

return name;

// 26.3.3.18.2

locate: function(load) {

return load.name;

// 26.3.3.18.3

fetch: function(load) {

// 26.3.3.18.4

translate: function(load) {

return load.source;

// 26.3.3.18.5

instantiate: function(load) {

}

};

var _newModule = Loader.prototype.newModule;

es-module-loader/src/loader.js at 0.17 · ModuleLoader/es-module-loader · GitHub

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