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/*
* es6-module-loader
* https://github.com/addyosmani/es6-module-loader
*
* Copyright (c) 2013 Guy Bedford, Luke Hoban, Addy Osmani
* Licensed under the MIT license.
*/
(function (root, factory) {
if (typeof exports === 'object') {
// CommonJS
factory(exports, false, require("./esprima-es6"));
} else if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['exports', true, 'esprima-es6'], factory);
}
}(this, function(exports, inBrowser, esprima) {
// new Loader( options ) - Module loader constructor
// The Loader constructor creates a new loader. The argument is the
// options object
//
// options.global - The loader's global object
// options.intrinsics - The loader's intrinsic methods
// options.strict - should code evaluated in the loader be in strict mode?
// options.normalize( request [, referer] ) - normalize hook
// options.resolve( normalized, { referer, metadata } ) - The URL resolution hook
// options.fetch( resolved, fulfill, reject, { normalized, referer, metadata } ) - The module loading hook
// options.translate( source, { normalized, address, metadata, type } ) - source translation hook
// options.link( source, { normalized, address, metadata, type } ) - the link hook
function Loader(options) {
// Initialization of loader state from options
// the global prototype chain is:
// global instance (this._global) -> intrinsics (this._intrinsics) -> initial global (options.global = window)
// global instance is created fresh to have this chain
// also sets global.window = global for full global encapsulation
// Object.create(window) doesn't work...
var Global = function () {}
Global.prototype = options.global || window;
this._builtins = new Global();
// some standard builtins can't work through this prototype
// structure so we need to wrap them to allow this global
// abstraction layer
var wrapped = {};
var wrap = ['addEventListener', 'removeEventListener', 'getComputedStyle', 'setTimeout', 'setInterval'];
for (var i = 0; i < wrap.length; i++) (function (name) {
wrapped[name] = function () {
return window[name].apply(window, arguments);
}
})(wrap[i]);
this.defineBuiltins(wrapped);
Global = function () {}
Global.prototype = this._builtins;
this._global = new Global();
Object.defineProperty(this._global, 'window', { value: this._global });
this._strict = !!options.strict;
this.normalize = options.normalize || exports.System.normalize;
this.resolve = options.resolve || exports.System.resolve;
this.fetch = options.fetch || exports.System.fetch;
this.translate = options.translate || exports.System.translate;
this.link = options.link || exports.System.link;
// The internal table of module instance objects
this._mios = {};
// the internal table of loaded scripts
this._sloaded = {};
// modules currently loading
// key is normalized name, value is an array of callback functions to be queued (optional)
this._mloads = {};
// scripts
this._sloads = {};
}
Object.defineProperty(Loader.prototype, "global", {
configurable: true,
enumerable: true,
get: function () {
return this._global;
}
});
// Loader.prototype.load( address, callback, errback [, referer = null] )
//
// The load method takes a string representing a module URL and a
// callback that receives the result of loading, compiling, and
// executing the module at that URL. The compiled code is statically
// associated with this loader, and its URL is the given URL. The
// additional callback is used if an error occurs.
//
// load will handle import statements, but export statements are a
// syntax error
Loader.prototype.load = function (url, callback, errback) {
var self = this;
if (url instanceof Array) {
var scriptCnt = 0;
for (var i = 0; i < url.length; i++) (function (i) {
self.load(url[i], function () {
scriptCnt++;
if (scriptCnt == url.length) {
callback && callback();
}
}, errback)
})(i);
return;
}
if (this._sloaded[url]) {
callback && callback();
return;
}
// store the callbacks in a load queue for multiple requests
if (this._sloads[url]) {
this._sloads[url].push({
callback: callback,
errback: errback
});
return;
}
else {
this._sloads[url] = [{
callback: callback,
errback: errback
}];
}
var _callback = function() {
for (var i = 0; i < self._sloads[url].length; i++)
self._sloads[url][i].callback && self._sloads[url][i].callback();
delete self._sloads[url];
}
var _errback = function(err) {
var allCalled = true;
for (var i = 0; i < self._sloads[url].length; i++) {
if (self._sloads[url][i].errback) {
self._sloads[url][i].errback(err);
}
else {
allCalled = false;
}
}
delete self._sloads[url];
// if any didn't have an error handler, throw
if (!allCalled)
throw err;
}
this.fetch(url, function (source) {
var opt = {
address: url,
type: 'script'
};
source = self.translate(source, opt);
self._linkExecute(url, source, opt, _callback, _errback, true);
}, _errback);
};
// Loader.prototype.import( name, callback, errback, referer = null )
// Asynchronously load a module or sequence of modules by name.
Loader.prototype.import = function (name, callback, errback, referer) {
var self = this;
if (name instanceof Array) {
var modules = [];
var moduleCnt = 0;
var self = this;
for (var i = 0; i < name.length; i++) (function(i) {
self.import(name[i], function(m) {
modules[i] = m;
moduleCnt++;
if (moduleCnt == name.length) {
callback && callback.apply(null, modules);
}
}, errback, referer);
})(i);
return;
}
name = this.normalize(name, referer);
var opt = {
referer: referer,
metadata: typeof name == 'object' ? name.metadata : null
};
// name is now the normalized name in this function
if (typeof name != 'string') {
name = name.normalized;
}
if (this._mios[name]) {
return callback && callback(this._mios[name]);
}
// store the callbacks in a load queue for multiple requests
if (this._mloads[name]) {
this._mloads[name].push({
callback: callback,
errback: errback
});
return;
}
else {
this._mloads[name] = [{
callback: callback,
errback: errback
}];
}
var _callback = function(module) {
self._mios[name] = module;
for (var i = 0; i < self._mloads[name].length; i++)
self._mloads[name][i].callback && self._mloads[name][i].callback(module);
delete self._mloads[name];
}
var _errback = function(err) {
var allCalled = true;
if (!self._mloads[name])
throw err;
for (var i = 0; i < self._mloads[name].length; i++) {
if (self._mloads[name][i].errback) {
self._mloads[name][i].errback(err);
}
else {
allCalled = false;
}
}
delete self._mloads[name];
// if any didn't have an error handler, throw
if (!allCalled)
throw err;
}
var url = this.resolve(name, opt);
if (typeof url != 'string') {
url = url.address;
// NB what to do with 'extra'?
}
opt.normalized = name;
this.fetch(url, function(source) {
opt.address = url;
opt.type = 'module';
source = self.translate(source, opt);
self._linkExecute(name, source, opt, _callback, _errback);
}, _errback, opt);
};
// Loader.prototype.fetch
// NB spec issue here - this clashes with the instance fetch function!?
// _linkExecute - private function
// given a normalized module name, the source, and the options metadata
// run the link and execute hooks, with the callback returning the
// defined module object
// isScript = true implies loading a script so don't define exports
var evalCnt = 0;
Loader.prototype._linkExecute = function (name, source, opt, callback, errback) {
// when no name is given,
// provide a unique name to cache the syntax tree parsing
if (!name) {
name = '__eval' + evalCnt++;
}
var isScript = opt.type == 'script';
var link = this.link(source, opt);
// 1. module
if (link instanceof Module && !isScript) {
return callback(link);
}
// preload esprima if necessary
var self = this;
ES6Parser.loadEsprima(name, source, function() {
var imports, execute;
// 2. specified imports and execute
if (typeof link == 'object' && !isScript) {
imports = link.imports;
execute = link.execute;
}
// 3. undefined -> default
else
imports = ES6Parser.parseImports(name, source);
// stops an unnecessary load cascade
if (errback.called)
return;
var _source = source;
var normalizeMap = {};
execute = execute || function() {
var exports;
// parses export statements and evaluates in the correct context
// returning the exports object
exports = ES6Parser.parseEval(_source, self, {
name: name,
normalizeMap: normalizeMap,
sourceURL: opt.address,
isEval: isScript
});
// only return exports for a module when not doing script eval
if (name && !isScript)
return new Module(exports || {});
}
if (!imports.length)
return callback(execute.call(self));
var deps = [];
var depCnt = 0;
for (var i = 0; i < imports.length; i++) (function(i) {
var referer = { name: name, address: opt.address };
// run the normalization to get the canonical module name
// to allow imports to be loaded
var normalized = self.normalize(imports[i], referer);
if (typeof normalized == 'object')
normalized = normalized.normalized;
normalizeMap[imports[i]] = normalized;
self.import(imports[i], function (module) {
depCnt++;
deps[i] = module;
if (depCnt == imports.length) {
try {
var output = execute.apply(self, deps);
callback(output);
}
catch(e) {
errback(e);
return;
}
}
}, errback, referer);
})(i);
}, errback);
};
// Loader.prototype.eval( source )
// Synchronously executes a Script non-terminal.
// If the compilation process results in a fetch, a SyntaxError is thrown.
// The compiled code is statically associated with this loader.
Loader.prototype.eval = function (source) {
ES6Parser.parseEval(source, this, {
isEval: true
});
};
// Loader.prototype.parseEval( source )
// Asynchronously executes a Script non-terminal.
// The compiled code is statically associated with this loader.
Loader.prototype.evalAsync = function (source, callback, errback) {
// links and then evals
this._linkExecute(null, source, { type: 'script' }, callback || function() {}, errback || function() {});
}
// Loader.prototype.get ( name )
//
// Look up a module in the loader’s registry, using a name that is assumed
// to be normalized.
Loader.prototype.get = function (name) {
return this._mios[name] || null;
};
// Loader.prototype.set( name, mod )
//
// Stores (possibly overwriting) a module instance object
// in the loader’s registry, using a name that is assumed to be normalized.
Loader.prototype.set = function (name, mod) {
this._mios[name] = new Module(mod);
};
Loader.prototype.has = function (name) {
return !!this._mios[name];
};
Loader.prototype.delete = function (name) {
delete this._mios[name];
};
// Loader.prototype.defineBuiltins( [ obj ] )
//
// The defineBuiltins method takes an object and defines all the built-in
// objects and functions of the ES6 standard library associated with this
// loader's intrinsics as properties on the object.
Loader.prototype.defineBuiltins = function (o) {
for (var p in o) {
if (o.hasOwnProperty(p)) {
this._builtins[p] = o[p];
}
}
};
function Module (o) {
if (typeof o != 'object') throw new TypeError("Expected object");
if (o instanceof Module) {
return o;
} else {
var self = this;
for (var key in o) {
(function (key) {
Object.defineProperty(self, key, {
configurable: false,
enumerable: true,
get: function () {
return o[key];
}
});
})(key);
}
}
};
// Pre-configured Loader instance for easier use
var absUrlRegEx = /^\/|([^\:\/]*:\/\/)/;
var isUrl = function(name) {
return name.substr(name.length - 3, 3) == '.js' || name.match(absUrlRegEx);
}
var defaultSystemLoader;
if (inBrowser) {
// make a default loader ready for the browser
defaultSystemLoader = new Loader({
global: window,
strict: false,
normalize: function(name, referer) {
if (isUrl(name))
return name;
var parentName = referer && referer.name;
if (name.substr(0, 2) == './') {
var parentParts = parentName && parentName.split('/');
if (!parentParts || !parentParts.length)
return name.substr(2);
parentParts.pop();
parentParts.push(name.substr(2));
return parentParts.join('/');
}
if (name.substr(0, 3) == '../') {
var parentParts = parentName && parentName.split('/');
if (!parentParts || !parentParts.length)
throw "Path below baseUrl";
parentParts.pop();
return this.normalize('./' + name.substr(3), { name: parentParts.join('/') });
}
return name;
},
resolve: function (name, options) {
for (var r in this.ondemandTable)
if (this.ondemandTable[r].indexOf(name) != -1)
return name;
if (isUrl(name))
return name;
return this.baseURL + (this.baseURL.substr(this.baseURL.length - 1, 1) != '/' ? '/' : '') + name + (name.substr(name.length - 3, 3) == '.js' ? '' : '.js');
},
fetch: function (url, fulfill, reject, options) {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200 || (xhr.status == 0 && xhr.responseText)) {
fulfill(xhr.responseText);
} else {
reject(xhr.statusText || 'XHR error');
}
}
};
xhr.open("GET", url, true);
xhr.send(null);
},
translate: function (source, options) {
return source;
},
link: function (source, options) {}
});
defaultSystemLoader.baseURL = document.URL.substring(0, window.location.href.lastIndexOf('\/') + 1);
defaultSystemLoader.ondemandTable = {};
defaultSystemLoader.ondemand = function (ondemandTable) {
for (var r in ondemandTable) {
this.ondemandTable[r] = this.ondemandTable[r] || [];
if (ondemandTable[r] instanceof Array)
this.ondemandTable[r] = this.ondemandTable[r].concat(ondemandTable[r]);
else
this.ondemandTable[r].push(ondemandTable[r]);
}
}
} else {
// make a default loader ready for node
defaultSystemLoader = new Loader({
global: this,
strict: true,
normalize: function(name, referer) {
if (isUrl(name))
return name;
var parentName = referer && referer.name;
if (name.substr(0, 2) == './') {
var parentParts = parentName && parentName.split('/');
if (!parentParts || !parentParts.length)
return name.substr(2);
parentParts.pop();
parentParts.push(name.substr(2));
return parentParts.join('/');
}
if (name.substr(0, 3) == '../') {
var parentParts = parentName && parentName.split('/');
if (!parentParts || !parentParts.length)
throw "Path below baseUrl";
parentParts.pop();
return this.normalize('./' + name.substr(3), { name: parentParts.join('/') });
}
return name;
},
resolve: function (name, options) {
if (isUrl(name))
return name;
return this.baseURL + (this.baseURL.substr(this.baseURL.length - 1, 1) != '/' ? '/' : '') + name + (name.substr(name.length - 3, 3) == '.js' ? '' : '.js');
},
fetch: function (url, fulfill, reject, options) {
require('fs').readFile(url, {encoding: 'utf8'}, function(err, data) {
if (err) {
reject(err);
}
fulfill(data);
});
},
translate: function (source, options) {
return source;
},
link: function (source, options) {}
});
}
// Syntax Parsing and Source Modifying Polyfills
// esprima-based parser for module syntax, with pluggable polyfill support
// var scripts = document.getElementsByTagName('script');
// var curScript = scripts[scripts.length - 1];
// var esprimaSrc = curScript.getAttribute('data-esprima-src') || curScript.src.substr(0, curScript.src.lastIndexOf('/') + 1) + 'esprima-es6.min.js';
var ES6Parser = {
// iterate the entire syntax tree node object with the given iterator function
traverse: function(object, iterator) {
var key, child;
if (iterator(object) === false)
return;
for (key in object) {
child = object[key];
if (typeof child == 'object' && child !== null)
this.traverse(child, iterator);
}
},
// module syntax regexs - may over-classify but not under-classify
// simply designed as a first level check to catch any use of
// module syntax, before loading esprima for deeper analysis
importRegEx: /^\s*import\s+./m,
exportRegEx: /^\s*export\s+(\{|\*|var|class|function|default)/m,
moduleRegEx: /^\s*module\s+("[^"]+"|'[^']+')\s*\{/m,
checkModuleSyntax: function(name, source) {
if (name == null || this.parseNames[name] === undefined)
this.parseNames[name] = source && !!(source.match(this.importRegEx) || source.match(this.exportRegEx) || source.match(this.moduleRegEx));
return this.parseNames[name];
},
loadEsprima: function(name, source, callback, errback) {
return callback();
// // use a regex to check if the source contains 'import', 'export' or 'module' statements
// // may incorrectly fire, but the damage is only an http request to do better parsing shortly
// if (!this.polyfills.length && !this.checkModuleSyntax(name, source))
// return callback();
// var self = this;
// System.load(esprimaSrc, function() {
// esprima = System.global.esprima;
// callback();
// });
},
// store the names of modules which needed to be parsed by esprima
parseNames: {},
// store the syntax trees for modules parsed by esprima
treeCache: {},
// parse the list of import module names for a given source
parseImports: function(name, source) {
// regex showed no need for esprima -> return empty
if (!this.checkModuleSyntax(name, source))
return [];
try {
var tree = this.treeCache[name] || (this.treeCache[name] = esprima.parse(source, { range: true }));
}
catch(e) {
e.message = 'Esprima parser error in "' + name + '"\n ' + e.message;
throw e;
}
var imports = [];
this.traverse(tree, function(node) {
if (node.type == 'ImportDeclaration') {
imports.push(node.source.value);
}
// export * from 'foo';
// export { ... } from 'foo';
else if (node.type == 'ExportDeclaration' && node.source) {
imports.push(node.source.value);
}
});
return imports;
},
// allow custom polyfills to be added in the form of syntax functions
addPolyfill: function(polyfill) {
// by virtue of adding a polyfill, we now load esprima by default
this.loadEsprima(null, null, function(){}, function(){});
this.polyfills.push(polyfill);
},
polyfills: [],
applyPolyfill: function(node, tSource) {
for (var i = 0; i < this.polyfills.length; i++)
this.polyfills[i](node, tSource);
},
// runs an eval of code with module syntax
// opt = {
// name: name, // normalized module name, used to load cached syntax tree
// normalizeMap: normalizeMap, // normalization map to save having to renormalize again
// sourceURL: opt.address, // used for source map
// isEval: isScript // indicate if exports should be parsed
// }
// return value is any exports as a plain object
parseEval: function(source, loader, opt) {
// regex showed no need for esprima - normal eval
if (!this.polyfills.length && !this.checkModuleSyntax(opt.name, source)) {
loader.global.__Loader = loader;
scopedEval((loader._strict ? '"use strict";\n' : '') + source, loader.global, opt.sourceURL);
delete loader.global.__Loader;
return;
}
var tree = this.treeCache[opt.name] || esprima.parse(source, { range: true });
var normalizeMap = opt.normalizeMap || {};
var tSource = new SourceModifier(source);
var self = this;
this.traverse(tree, function(node) {
// --- Imports ---
if (node.type == 'ImportDeclaration') {
var moduleName = normalizeMap[node.source.value] || node.source.value;
// import $ from 'jquery';
if (node.kind == 'default') {
tSource.replace(node.range[0], node.range[1], "var " + node.specifiers[0].id.name + " = __Loader.get('" + moduleName + "')['default'];");
}
// import { ... } from 'jquery';
else {
var replaceSource = "var __module = __Loader.get('" + moduleName + "');";
for (var i = 0; i < node.specifiers.length; i++) {
var specifier = node.specifiers[i];
replaceSource += "var " + (specifier.name ? specifier.name.name : specifier.id.name) + " = __module['" + specifier.id.name + "'];";
}
tSource.replace(node.range[0], node.range[1], replaceSource);
}
}
// --- Exports ---
else if (node.type == 'ExportDeclaration') {
if (node.declaration) {
var exportName;
var declarationIndex = node.declaration.range[0] - 1;
if (node.declaration.type == 'VariableDeclaration') {
var declaration = node.declaration.declarations[0];
// export var p = ...
if (declaration.init) {
exportName = declaration.id.name;
declarationIndex = declaration.init.range[0] - 1;
}
}
// export function q() {}
// export class q {}
else if (node.declaration.type == 'FunctionDeclaration' || node.declaration.type == 'ClassDeclaration')
exportName = node.declaration.id.name;
// export default ... overrides any other name
if (node.default)
exportName = 'default';
tSource.replace(node.range[0], declarationIndex, "__exports['" + exportName + "'] = ");
}
else if (node.source) {
var moduleName = normalizeMap[node.source.value] || node.source.value;
// export * from 'jquery'
if (node.specifiers[0].type == 'ExportBatchSpecifier') {
tSource.replace(node.range[0], node.range[1], "var __module = __Loader.get('" + moduleName + "'); for (var m in __module) { __exports[m] = __module[m]; }; ");
}
// export { a as b, c as d } from 'jquery'
else {
var replaceSource = "var __module = __Loader.get('" + moduleName + "'); ";
for (var i = 0; i < node.specifiers.length; i++) {
var specifier = node.specifiers[i];
replaceSource += "__exports['" + (specifier.name ? specifier.name.name : specifier.id.name) + "'] = __module['" + specifier.id.name + "']; ";
}
tSource.replace(node.range[0], node.range[1], replaceSource);
}
}
else {
// export {a as b, c as d}
var replaceSource = "";
for (var i = 0; i < node.specifiers.length; i++) {
var specifier = node.specifiers[i];
replaceSource += "__exports['" + specifier.id.name + "'] = " + (specifier.name ? specifier.name.name : specifier.id.name) + "; ";
}
tSource.replace(node.range[0], node.range[1], replaceSource);
}
}
// --- Modules ---
else if (node.type == 'ModuleDeclaration' && node.body.type == 'BlockStatement') {
// module 'foo' { ..code.. }
// -> (function() { var __exports = {}; ..code.. __Loader.set("foo", new Module(__exports)); })();
tSource.replace(node.range[0], node.body.range[0] + 1, "(function() { var __exports = {}; ");
tSource.replace(node.body.range[1], node.range[1], " __Loader.set('" + node.id.name + "', new Module(__exports)); })();");
}
// --- Polyfills ---
else if (self.polyfills.length)
self.applyPolyfill(node, tSource);
});
delete this.treeCache[opt.name];
loader.global.__Loader = loader;
var exports = loader.global.__exports = {};
scopedEval((loader._strict ? '"use strict";\n' : '') + tSource.toString(), loader.global, opt.sourceURL);
delete loader.global.__Loader;
delete loader.global.__exports;
// if exports are defined and it is an eval, throw
if (opt.isEval) {
for (var e in exports) {
throw 'Exports only supported for modules, not script evaluation.'
}
}
return exports;
}
};
/*
* SourceModifier
*
* Allows for partial modification of a source file based on successive
* range adjustment operations consistent with the original source file
*
* Example:
* 012345678910
* var h = new SourceModifier('hello world');
* h.replace(2, 4, 'y');
* h.replace(6, 10, 'person');
* h.source == 'hey person';
* h.rangeOps == [{start: 2, end: 4, diff: -2}, {start: 4, end: 9, diff: 1}]
*
*/
var SourceModifier = function(source) {
this.source = source;
this.rangeOps = [];
}
SourceModifier.prototype = {
mapIndex: function(index) {
// apply the range operations in order to the index
for (var i = 0; i < this.rangeOps.length; i++) {
var curOp = this.rangeOps[i];
if (curOp.start >= index)
continue;
if (curOp.end <= index) {
index += curOp.diff;
continue;
}
throw 'Source location ' + index + ' has already been transformed!';
}
return index;
},
replace: function(start, end, replacement) {
var diff = replacement.length - (end - start + 1);
start = this.mapIndex(start);
end = this.mapIndex(end);
this.source = this.source.substr(0, start) + replacement + this.source.substr(end + 1);
this.rangeOps.push({
start: start,
end: end,
diff: diff
});
},
getRange: function(start, end) {
return this.source.substr(this.mapIndex(start), this.mapIndex(end));
},
toString: function() {
return this.source;
}
};
// Export the Loader class
exports.Loader = Loader;
// Export the Module class
exports.Module = Module;
// Export the System object
exports.System = defaultSystemLoader;
// carefully scoped eval with given global
var scopedEval = function(source, global, sourceURL) {
eval('(function(window) { with(global) { ' + source + ' } }).call(global, global);' +
(sourceURL ? '\n//# sourceURL=' + sourceURL : ''));
}
}));
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