systemjs/loader.js

828 lines
28 KiB
JavaScript

/*
* ES6 RequireJS-style module loader
*
* Supports RequireJS-inspired map, packages and plugins.
*
* https://github.com/jspm/jspm-loader
*
* MIT
*
*/
(function() {
(function() {
var isBrowser = typeof window != 'undefined';
var global = isBrowser ? window : {};
var startConfig = global.jspm || {};
var config = {};
config.waitSeconds = 20;
config.map = config.map || {};
config.locations = config.locations || {};
config.depends = config.depends || {};
global.createLoader = function() {
delete global.createLoader;
config.baseURL = config.baseURL || isBrowser ? document.URL.substring(0, window.location.href.lastIndexOf('\/') + 1) : './';
config.locations.plugin = config.locations.plugin || config.baseURL;
// -- helpers --
// es6 module regexs to check if it is a module or a global script
var importRegEx = /^\s*import\s+./m;
var exportRegEx = /^\s*export\s+(\{|\*|var|class|function|default)/m;
var moduleRegEx = /^\s*module\s+("[^"]+"|'[^']+')\s*\{/m;
// AMD and CommonJS regexs for support
var amdDefineRegEx = /(?:^\s*|[}{\(\);,\n]\s*)define\s*\(\s*("[^"]+"\s*,|'[^']+'\s*,)?\s*(\[(\s*("[^"]+"|'[^']+')\s*,)*(\s*("[^"]+"|'[^']+')\s*)?\])?/g;
var cjsDefineRegEx = /(?:^\s*|[}{\(\);,\n]\s*)define\s*\(\s*(function\s*|{|[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*\))/g;
var cjsRequireRegEx = /(?:^\s*|[}{\(\);,\n=:]\s*)require\s*\(\s*("([^"]+)"|'([^']+)')\s*\)/g;
var cjsExportsRegEx = /(?:^\s*|[}{\(\);,\n=:]\s*)exports\s*\[\s*('[^']+'|"[^"]+")\s*\]|\exports\s*\.\s*[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*|exports\s*\=/g;
// global dependency specifier, used for shimmed dependencies
var globalDependencyRegEx = /["']import ([^'"]+)["']/g;
var sourceMappingURLRegEx = /\/\/[@#] ?sourceMappingURL=(.+)/;
var sourceURLRegEx = /\/\/[@#] ?sourceURL=(.+)/;
// regex to check absolute urls
var absUrlRegEx = /^\/|([^\:\/]*:\/\/)/;
// function to remove the comments from a string
function removeComments(str) {
// if it is uglified code, skip
var newlines = str.match(/\n/g);
var lineCnt = newlines && newlines.length || 0;
if (str.length / lineCnt > 200)
return false;
// output
// block comments replaced with equivalent whitespace
// this is to ensure source maps remain valid
var curOutIndex = 0,
outString = '',
blockCommentWhitespace = '';
// mode variables
var singleQuote = false,
doubleQuote = false,
regex = false,
blockComment = false,
doubleBackslash = false,
lineComment = false;
// character buffer
var lastChar;
var curChar = '';
var lastToken;
for (var i = 0, l = str.length; i <= l; i++) {
lastChar = curChar;
curChar = str.charAt(i);
if (curChar === '\n' || curChar === '\r' || curChar === '') {
regex = doubleQuote = singleQuote = doubleBackslash = false;
if (lineComment) {
curOutIndex = i;
lineComment = false;
}
if (blockComment)
blockCommentWhitespace += curChar;
lastToken = '';
continue;
}
if (lastChar !== ' ' && lastChar !== '\t')
lastToken = lastChar;
if (singleQuote || doubleQuote || regex) {
if (curChar == '\\' && lastChar == '\\')
doubleBackslash = !doubleBackslash;
}
if (singleQuote) {
if (curChar === "'" && (lastChar !== '\\' || doubleBackslash))
singleQuote = doubleBackslash = false;
}
else if (doubleQuote) {
if (curChar === '"' && (lastChar !== '\\' || doubleBackslash))
doubleQuote = doubleBackslash = false;
}
else if (regex) {
if (curChar === '/' && (lastChar !== '\\' || doubleBackslash)) {
// a comment inside a regex immediately means we've misread the regex
// so switch back to block mode to detect the comment
if (str.charAt(i + 1) == '/') {
regex = doubleBackslash = false;
}
else {
regex = doubleBackslash = false;
i++;
lastToken = lastChar = curChar;
curChar = str.charAt(i);
}
}
}
else if (blockComment) {
blockCommentWhitespace += ' ';
if (curChar === '/' && lastChar === '*' && blockCommentWhitespace.length > 3) {
blockComment = false;
curOutIndex = i + 1;
}
}
else if (!lineComment) {
doubleQuote = curChar === '"';
singleQuote = curChar === "'";
if (lastChar !== '/')
continue;
if (curChar === '*') {
blockComment = true;
outString += blockCommentWhitespace + str.substring(curOutIndex, i - 1);
blockCommentWhitespace = ' ';
}
else if (curChar === '/') {
lineComment = true;
outString += blockCommentWhitespace + str.substring(curOutIndex, i - 1);
blockCommentWhitespace = '';
}
else if (lastToken !== '}' && lastToken !== ')' && lastToken !== ']' && !lastToken.match(/\w|\d|'|"|\-|\+/)) {
// detection not perfect - careful comment detection within regex is used to compensate
// without sacrificing global comment removal accuracy
regex = true;
}
}
}
return outString + blockCommentWhitespace + str.substr(curOutIndex);
}
// configuration object extension
// objects extend, everything else replaces
var extend = function(objA, objB) {
for (var p in objB) {
if (typeof objA[p] == 'object' && !(objA[p] instanceof Array))
extend(objA[p], objB[p])
else
objA[p] = objB[p];
}
}
// check if a module name starts with a given prefix
// the key check is not to match the prefix 'jquery'
// to the module name jquery-ui/some/thing, and only
// to jquery/some/thing or jquery:some/thing
// (multiple ':'s is a module name error)
var prefixMatch = function(name, prefix) {
var prefixParts = prefix.split(/[\/:]/);
var nameParts = name.split(/[\/:]/);
if (prefixParts.length > nameParts.length)
return false;
for (var i = 0; i < prefixParts.length; i++)
if (nameParts[i] != prefixParts[i])
return false;
return true;
}
// check if the module is defined on a location
var getLocation = function(name) {
var locationParts = name.split(':');
return locationParts[1] !== undefined && !name.match(absUrlRegEx) ? locationParts[0] : '';
}
// given a resolved module name and normalized parent name,
// apply the map configuration
var applyMap = function(name, parentName) {
parentName = parentName || '';
var location = getLocation(name);
var parentLocation = getLocation(parentName);
// if there is a parent location, and there is no location, add it here
if (parentLocation && !location)
name = parentLocation + ':' + name;
// check for most specific map config
var parentPrefixMatch = ''; // the matching parent refix
var mapPrefixMatch = ''; // the matching map prefix
var mapMatch = ''; // the matching map value
for (var p in config.map) {
var curMap = config.map[p];
// do the global map check
if (p == '*')
continue;
if (typeof curMap == 'string') {
if (!prefixMatch(name, p))
continue;
if (p.length <= mapPrefixMatch.length)
continue;
mapPrefixMatch = p;
mapMatch = curMap;
}
if (!prefixMatch(parentName, p))
continue;
// now check if this matches our current name
for (var _p in curMap) {
if (!prefixMatch(name, _p))
continue;
// the most specific mapPrefix wins first
if (_p.length < mapPrefixMatch.length)
continue;
// then the most specific prefixMatch on the parent name
if (_p.length == mapPrefixMatch.length && p.length < parentPrefixMatch.length)
continue;
parentPrefixMatch = p;
mapPrefixMatch = _p;
mapMatch = curMap[_p];
}
}
// now compare against the global map config
for (var _p in config.map['*'] || {}) {
if (!prefixMatch(name, _p))
continue;
if (_p.length <= mapPrefixMatch.length)
continue;
mapPrefixMatch = _p;
mapMatch = config.map['*'][_p];
}
// apply map config
if (mapPrefixMatch) {
// get main specifier (#main)
var main;
if (mapMatch.indexOf('#') != -1) {
main = mapMatch.substr(mapMatch.indexOf('#') + 1);
mapMatch = mapMatch.substr(0, mapMatch.length - main.length - 1);
}
name = mapMatch + name.substr(mapPrefixMatch.length) + (name.length == mapPrefixMatch.length && main ? '/' + main : '');
}
return name;
}
// given a module's global dependencies, prepare the global object
// to contain the union of the defined properties of its dependent modules
var globalObj = {};
function setGlobal(deps) {
// first, we add all the dependency module properties to the global
if (deps) {
for (var i = 0; i < deps.length; i++) {
var dep = deps[i];
for (var m in dep)
jspm.global[m] = dep[m];
}
}
// now we store a complete copy of the global object
// in order to detect changes
for (var g in jspm.global) {
if (jspm.global.hasOwnProperty(g))
globalObj[g] = jspm.global[g];
}
}
// go through the global object to find any changes
// the differences become the returned global for this object
// the global object is left as is
function getGlobal() {
var moduleGlobal = {};
var firstGlobalName;
var globalCnt = 0;
for (var g in jspm.global) {
if (jspm.global.hasOwnProperty(g) && g != (isBrowser ? 'window' : 'global') && globalObj[g] != jspm.global[g]) {
moduleGlobal[g] = jspm.global[g];
firstGlobalName = firstGlobalName || g;
globalCnt++;
}
}
// for a single global, return directly
if (globalCnt == 1)
return { default: moduleGlobal[firstGlobalName] };
else
return moduleGlobal;
}
var pluginRegEx = /(\.[^\/\.]+)?!(.*)/;
var nodeProcess = {
nextTick: function(f) {
setTimeout(f, 7);
}
};
var nodeGlobals = ['global', 'exports', 'process', 'require', '__filename', '__dirname', 'module'];
// -- /helpers --
var jspm = global.jspm = new global.Loader({
global: global,
normalize: function(name, referer) {
name = name.trim();
var parentName = referer && referer.name;
// if it has a js extension, and not a url or plugin, remove the js extension
if (!pluginMatch && name.substr(name.length - 3, 3) == '.js' && !name.match(absUrlRegEx))
name = name.substr(0, name.length - 3);
// check for a plugin (some/name!plugin)
var pluginMatch = name.match(pluginRegEx);
// if a plugin, remove the plugin part to do normalization
var pluginName;
if (pluginMatch) {
pluginName = pluginMatch[2] || pluginMatch[1].substr(1);
name = name.substr(0, name.length - pluginMatch[2].length - 1);
}
if (name.substr(0, 1) != '#') {
// treat an initial '/' as location relative
if (name.substr(0, 1) == '/')
name = name.substr(1);
// do standard normalization (resolve relative module name)
name = global.System.normalize(name, referer);
// do map config
name = applyMap(name, parentName);
}
if (pluginName)
name = name + '!' + pluginName;
return name;
},
resolve: function(name, options) {
var pluginMatch = name.match(pluginRegEx);
// remove plugin part
if (pluginMatch)
name = name.substr(0, name.length - pluginMatch[2].length - 1);
// ondemand
for (var r in this.ondemandTable)
if (this.ondemandTable[r].indexOf(name) != -1)
return name;
if (name.match(absUrlRegEx))
return name;
// locations
var oldBaseURL = this.baseURL;
var location = getLocation(name);
if (location) {
if (!config.locations[location])
throw 'Location "' + location + '" not defined.';
this.baseURL = config.locations[location];
name = name.substr(location.length + 1);
}
var address = global.System.resolve.call(this, name, options);
// remove js extension added if a plugin
if (pluginMatch)
address = address.substr(0, address.length - 3);
this.baseURL = oldBaseURL;
if (location)
return address;
else
// cache bust local
return address;// + '?' + (new Date()).getTime();
},
fetch: function(url, callback, errback, options) {
options = options || {};
var pluginMatch = (options.normalized || '').match(pluginRegEx);
if (!pluginMatch) {
// do a fetch with a timeout
var rejected = false;
if (config.waitSeconds) {
var waitTime = 0;
setTimeout(function() {
waitTime++;
if (waitTime >= config.waitSeconds) {
rejected = true;
errback();
}
}, 1000);
}
global.System.fetch(url, function(source) {
if (!rejected)
callback(source);
}, errback, options);
return;
}
// for plugins, we first need to load the plugin module itself
var pluginName = pluginMatch[2];
jspm.import('plugin:' + pluginName, function(plugin) {
plugin(options.normalized.substr(0, options.normalized.indexOf('!')), url, jspm.fetch, callback, errback);
});
},
link: function(originalSource, options) {
var source = originalSource || '';
if (config.onLoad)
config.onLoad(options.normalized, source, options);
if (source.match(importRegEx) || source.match(exportRegEx) || source.match(moduleRegEx))
return;
// detect any source map comments
var sourceMappingURL = source.match(sourceMappingURLRegEx);
if (sourceMappingURL)
sourceMappingURL = sourceMappingURL[1];
var sourceURL = source.match(sourceURLRegEx);
sourceURL = sourceURL ? sourceURL[1] : null;
// remove comments before doing regular expressions
source = removeComments(source);
if (!source) {
// comments not removed - use original source
source = originalSource || '';
// dont add the sourceURL and sourceMappingURL now
sourceMappingURL = null;
sourceURL = sourceURL ? null : options.address;
}
else
sourceURL = sourceURL || options.address;
var match;
// depends config
var _imports = config.depends[options.normalized] ? [].concat(config.depends[options.normalized]) : [];
// check if this module uses AMD form
// define([.., .., ..], ...)
// define('modulename', [.., ..., ..])
amdDefineRegEx.lastIndex = 0;
if ((match = amdDefineRegEx.exec(source)) && (match[2] || match[1])) {
_imports = _imports.concat(eval(match[2] || '[]'));
// if its a named define, check for any other named defines in this file
if (match[1]) {
var defines = [match[1]];
while (match = amdDefineRegEx.exec(source)) {
if (match[1]) {
defines.push(match[1]);
_imports = _imports.concat(eval(match[2] || '[]'));
}
}
// ensure imports are unique
for (var i = 0; i < _imports.length; i++) {
if (_imports.lastIndexOf(_imports[i]) != i)
_imports.splice(i--, 1);
}
// run through the defined names and remove them from the imports
for (var i = 0; i < defines.length; i++) {
if (_imports.indexOf(defines[i]) != -1)
_imports.splice(_imports.indexOf(defines[i]), 1);
}
}
// remove any reserved words
var requireIndex, exportsIndex, moduleIndex;
if ((requireIndex = _imports.indexOf('require')) != -1)
_imports.splice(requireIndex, 1);
if ((exportsIndex = _imports.indexOf('exports')) != -1)
_imports.splice(exportsIndex, 1);
if ((moduleIndex = _imports.indexOf('module')) != -1)
_imports.splice(moduleIndex, 1);
return {
imports: _imports,
execute: function() {
var deps = Array.prototype.splice.call(arguments, 0);
// add system dependencies
var exports;
if (moduleIndex != -1)
deps.splice(moduleIndex, 0, { id: options.normalized, uri: options.address });
if (exportsIndex != -1)
deps.splice(exportsIndex, 0, exports = {});
if (requireIndex != -1)
deps.splice(requireIndex, 0, function(names, callback, errback) {
if (typeof names == 'object' && !(names instanceof Array))
return require.apply(null, Array.prototype.splice.call(arguments, 1));
return jspm.require(names, callback, errback, { name: options.normalized, address: options.address });
});
var output;
var g = jspm.global;
g.require = g.requirejs = jspm.require;
g.define = function(name, dependencies, factory) {
// anonymous define
if (typeof name != 'string') {
factory = dependencies;
name = undefined;
}
// no dependencies
if (!(dependencies instanceof Array))
factory = dependencies;
// run the factory function
if (typeof factory == 'function')
output = factory.apply(g, deps);
// otherwise factory is the value
else
output = factory;
if (name && name != options.normalized)
jspm.set(name, { default: output });
}
g.define.amd = {};
// ensure no NodeJS environment detection
delete g.module;
delete g.exports;
__scopedEval(source, g, sourceURL, sourceMappingURL);
delete g.define;
delete g.require;
delete g.requirejs;
return new global.Module({ 'default': output || exports });
}
};
}
// check if it uses the AMD CommonJS form
// define(varName); || define(function(require, exports) {}); || define({})
if (source.match(cjsDefineRegEx)) {
var match;
while (match = cjsRequireRegEx.exec(source))
_imports.push(match[2] || match[3]);
return {
imports: _imports,
execute: function() {
var depMap = {};
for (var i = 0; i < _imports.length; i++)
depMap[_imports[i]] = arguments[i]['default'] || arguments[i];
var exports = {};
var module = { id: options.normalized, uri: options.address };
var g = jspm.global;
g.require = g.requirejs = jspm.require;
var output;
g.define = function(factory) {
output = typeof factory == "function" ? factory.call(g, function(d) {
return depMap[d];
}, exports) : factory;
};
g.define.amd = {};
// ensure no NodeJS environment detection
delete g.module;
delete g.exports;
__scopedEval(source, g, sourceURL, sourceMappingURL);
delete g.require;
delete g.requirejs;
delete g.define;
return new global.Module({ 'default': output || exports });
}
};
}
// CommonJS
// require('...') || exports[''] = ... || exports.asd = ... || module.exports = ...
if (source.match(cjsExportsRegEx) || source.match(cjsRequireRegEx)) {
var match;
while (match = cjsRequireRegEx.exec(source))
_imports.push(match[2] || match[3]);
return {
imports: _imports, // clone the array as we still need it
execute: function(deps) {
var depMap = {};
for (var i = 0; i < _imports.length; i++)
depMap[_imports[i]] = arguments[i]['default'] || arguments[i];
var dirname = options.address.split('/');
dirname.pop();
dirname = dirname.join('/');
var g = jspm.global;
g.global = g;
g.exports = {};
g.process = nodeProcess;
g.require = function(d) {
return depMap[d];
}
g.__filename = options.address;
g.__dirname = dirname;
g.module = {
exports: g.exports
};
__scopedEval(source, g, sourceURL, sourceMappingURL);
var outModule = new global.Module({ 'default': g.module.exports });
for (var p in nodeGlobals)
delete g[p];
return outModule;
}
};
}
// global script
// check for global shimmed dependencies
// specified with eg:
// "import lib:jquery";
while (match = globalDependencyRegEx.exec(source))
_imports.push(match[1]);
return {
// apply depends config
imports: _imports,
execute: function(deps) {
if (source == '')
return new global.Module({});
setGlobal(deps);
__scopedEval(source, jspm.global, sourceURL, sourceMappingURL);
return new global.Module(getGlobal());
}
};
}
});
var _import = jspm.import;
jspm.import = function(name, callback, errback, referer) {
_import.call(jspm, name, function() {
var newArgs = [];
for (var i = 0; i < arguments.length; i++) {
var isDefaultOnly = true;
for (var q in arguments[i])
if (arguments[i].hasOwnProperty(q)) {
if (q != 'default') {
isDefaultOnly = false;
break;
}
}
if (isDefaultOnly && arguments[i] && arguments[i].default)
newArgs[i] = arguments[i].default;
else
newArgs[i] = arguments[i];
}
if (callback)
callback.apply(null, newArgs);
}, errback, referer);
}
jspm.baseURL = config.baseURL;
// ondemand functionality
jspm.ondemandTable = {};
jspm.ondemand = global.System.ondemand;
jspm._config = config;
jspm.config = function(newConfig) {
if (newConfig.paths)
extend(newConfig.map = newConfig.map || {}, newConfig.paths);
extend(config, newConfig);
if (newConfig.baseURL)
jspm.baseURL = newConfig.baseURL;
if (newConfig.baseUrl)
jspm.baseURL = newConfig.baseUrl;
if (newConfig.localLibs)
for (var l in config.locations)
config.locations[l] = newConfig.localLibs + '/' + l;
}
jspm.ondemand = function(resolvers) {
jspm.ondemand(resolvers);
}
/*
AMD & CommonJS-compatible require
To copy RequireJS, set window.require = window.requirejs = jspm.require
*/
jspm.require = function(names, callback, errback, referer) {
// in amd, first arg can be a config object
if (typeof names == 'object' && !(names instanceof Array)) {
jspm.config(names);
return jspm.require.apply(null, Array.prototype.splice.call(arguments, 1));
}
if (typeof callback == 'object') {
referer = callback;
callback = undefined;
}
else if (typeof errback == 'object') {
referer = errback;
errback = undefined;
}
// amd require
if (names instanceof Array)
return jspm.import(names, callback, errback, referer);
// commonjs require
else if (typeof names == 'string')
return jspm.get(names);
else
throw 'Invalid require';
}
jspm.require.config = jspm.config;
// add convenience locations
jspm.config({
locations: {
github: 'https://github.jspm.io',
npm: 'https://npm.jspm.io',
cdnjs: 'https://cdnjs.cloudflare.com/ajax/libs',
lib: 'https://registry.jspm.io',
plugin: 'https://github.jspm.io/jspm/plugins@0.0.7'
}
});
// add initial config
jspm.config(startConfig);
if (!isBrowser)
module.exports = jspm;
}
// dynamically polyfill the es6 loader if necessary
if (!global.Loader) {
if (isBrowser) {
// determine the current script path as the base path
var scripts = document.getElementsByTagName('script');
var head = document.getElementsByTagName('head')[0];
var curPath = scripts[scripts.length - 1].src;
var basePath = curPath.substr(0, curPath.lastIndexOf('/') + 1);
document.write(
'<' + 'script type="text/javascript" src="' + basePath + 'es6-module-loader.js">' + '<' + '/script>' +
'<' + 'script type="text/javascript">' + 'createLoader();' + '<' + '/script>'
);
}
else {
var es6ModuleLoader = require('es6-module-loader');
global.System = es6ModuleLoader.System;
global.Loader = es6ModuleLoader.Loader;
global.Module = es6ModuleLoader.Module;
global.createLoader();
}
}
else
createLoader();
})();
// carefully scoped eval with given global
var __scopedEval = function(__source, global, __sourceURL, __sourceMappingURL) {
eval('(function(global) { with(global) { ' + __source + ' \n } }).call(global, global);' + (__sourceMappingURL
? '\n//# sourceMappingURL=' + __sourceMappingURL
: (__sourceURL ? '\n//# sourceURL=' + __sourceURL : '')));
}
})();