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loader.js
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loader.js
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var loader, define, requireModule, require, requirejs;
(function(global) {
'use strict';
var heimdall = global.heimdall;
var {
define: __define,
require: __require,
exports: __exports,
findModule: __findModule,
resolve: __resolve,
reify,
findDeps,
modules,
resolveRelative,
pendingQueueLength
} = heimdall.registerMonitor('loaderjs',
'define',
'require',
'reify',
'findDeps',
'modules',
'exports',
'resolve',
'resolveRelative',
'findModule',
'pendingQueueLength');
function dict() {
var obj = Object.create(null);
obj['__'] = undefined;
delete obj['__'];
return obj;
}
// Save off the original values of these globals, so we can restore them if someone asks us to
var oldGlobals = {
loader: loader,
define: define,
requireModule: requireModule,
require: require,
requirejs: requirejs
};
requirejs = require = requireModule = function(name) {
var token = heimdall.start('require');
heimdall.increment(__require);
var pending = [];
var mod = findModule(name, '(require)', pending);
for (var i = pending.length - 1; i >= 0; i--) {
pending[i].exports();
}
heimdall.stop(token);
return mod.module.exports;
};
loader = {
noConflict: function(aliases) {
var oldName, newName;
for (oldName in aliases) {
if (aliases.hasOwnProperty(oldName)) {
if (oldGlobals.hasOwnProperty(oldName)) {
newName = aliases[oldName];
global[newName] = global[oldName];
global[oldName] = oldGlobals[oldName];
}
}
}
}
};
var registry = dict();
var seen = dict();
var uuid = 0;
function unsupportedModule(length) {
throw new Error('an unsupported module was defined, expected `define(name, deps, module)` instead got: `' +
length + '` arguments to define`');
}
var defaultDeps = ['require', 'exports', 'module'];
function Module(name, deps, callback, alias) {
heimdall.increment(modules);
this.id = uuid++;
this.name = name;
this.deps = !deps.length && callback.length ? defaultDeps : deps;
this.module = { exports: {} };
this.callback = callback;
this.hasExportsAsDep = false;
this.isAlias = alias;
this.reified = new Array(deps.length);
/*
Each module normally passes through these states, in order:
new : initial state
pending : this module is scheduled to be executed
reifying : this module's dependencies are being executed
reified : this module's dependencies finished executing successfully
errored : this module's dependencies failed to execute
finalized : this module executed successfully
*/
this.state = 'new';
}
Module.prototype.makeDefaultExport = function() {
var exports = this.module.exports;
if (exports !== null &&
(typeof exports === 'object' || typeof exports === 'function') &&
exports['default'] === undefined && Object.isExtensible(exports)) {
exports['default'] = exports;
}
};
Module.prototype.exports = function() {
// if finalized, there is no work to do. If reifying, there is a
// circular dependency so we must return our (partial) exports.
if (this.state === 'finalized' || this.state === 'reifying') { return this.module.exports; }
heimdall.increment(__exports);
if (loader.wrapModules) {
this.callback = loader.wrapModules(this.name, this.callback);
}
this.reify();
var result = this.callback.apply(this, this.reified);
this.reified.length = 0;
this.state = 'finalized';
if (!(this.hasExportsAsDep && result === undefined)) {
this.module.exports = result;
}
this.makeDefaultExport();
return this.module.exports;
};
Module.prototype.unsee = function() {
this.state = 'new';
this.module = { exports: {} };
};
Module.prototype.reify = function() {
if (this.state === 'reified') { return; }
this.state = 'reifying';
try {
this.reified = this._reify();
this.state = 'reified';
} finally {
if (this.state === 'reifying') {
this.state = 'errored';
}
}
};
Module.prototype._reify = function() {
heimdall.increment(reify);
var reified = this.reified.slice();
for (var i = 0; i < reified.length; i++) {
var mod = reified[i];
reified[i] = mod.exports ? mod.exports : mod.module.exports();
}
return reified;
};
Module.prototype.findDeps = function(pending) {
if (this.state !== 'new') {
return;
}
heimdall.increment(findDeps);
this.state = 'pending';
var deps = this.deps;
for (var i = 0; i < deps.length; i++) {
var dep = deps[i];
var entry = this.reified[i] = { exports: undefined, module: undefined };
if (dep === 'exports') {
this.hasExportsAsDep = true;
entry.exports = this.module.exports;
} else if (dep === 'require') {
entry.exports = this.makeRequire();
} else if (dep === 'module') {
entry.exports = this.module;
} else {
entry.module = findModule(resolve(dep, this.name), this.name, pending);
}
}
};
Module.prototype.makeRequire = function() {
var name = this.name;
var r = function(dep) {
return require(resolve(dep, name));
};
r['default'] = r;
r.has = function(dep) {
return has(resolve(dep, name));
};
return r;
};
define = function(name, deps, callback) {
var module = registry[name];
// If a module for this name has already been defined and is in any state
// other than `new` (meaning it has been or is currently being required),
// then we return early to avoid redefinition.
if (module && module.state !== 'new') {
return;
}
var token = heimdall.start('define');
heimdall.increment(__define);
if (arguments.length < 2) {
unsupportedModule(arguments.length);
}
if (!Array.isArray(deps)) {
callback = deps;
deps = [];
}
if (callback instanceof Alias) {
registry[name] = new Module(callback.name, deps, callback, true);
} else {
registry[name] = new Module(name, deps, callback, false);
}
heimdall.stop(token);
};
define.exports = function(name, defaultExport) {
var module = registry[name];
// If a module for this name has already been defined and is in any state
// other than `new` (meaning it has been or is currently being required),
// then we return early to avoid redefinition.
if (module && module.state !== 'new') {
return;
}
module = new Module(name, [], noop, null);
module.module.exports = defaultExport;
module.state = 'finalized';
registry[name] = module;
return module;
};
function noop() { }
// we don't support all of AMD
// define.amd = {};
function Alias(path) {
this.name = path;
}
define.alias = function(path, target) {
if (arguments.length === 2) {
return define(target, new Alias(path));
}
return new Alias(path);
};
function missingModule(name, referrer) {
throw new Error('Could not find module `' + name + '` imported from `' + referrer + '`');
}
function findModule(name, referrer, pending) {
heimdall.increment(__findModule);
var mod = registry[name] || registry[name + '/index'];
while (mod && mod.isAlias) {
mod = registry[mod.name];
}
if (!mod) { missingModule(name, referrer); }
if (pending && mod.state !== 'pending' && mod.state !== 'finalized') {
mod.findDeps(pending);
pending.push(mod);
heimdall.increment(pendingQueueLength);
}
return mod;
}
function resolve(child, name) {
heimdall.increment(__resolve);
if (child.charAt(0) !== '.') { return child; }
heimdall.increment(resolveRelative);
var parts = child.split('/');
var nameParts = name.split('/');
var parentBase = nameParts.slice(0, -1);
for (var i = 0, l = parts.length; i < l; i++) {
var part = parts[i];
if (part === '..') {
if (parentBase.length === 0) {
throw new Error('Cannot access parent module of root');
}
parentBase.pop();
} else if (part === '.') {
continue;
} else { parentBase.push(part); }
}
return parentBase.join('/');
}
function has(name) {
return !!(registry[name] || registry[name + '/index']);
}
requirejs.entries = requirejs._eak_seen = registry;
requirejs.has = has;
requirejs.unsee = function(moduleName) {
findModule(moduleName, '(unsee)', false).unsee();
};
requirejs.clear = function() {
requirejs.entries = requirejs._eak_seen = registry = dict();
seen = dict();
};
// This code primes the JS engine for good performance by warming the
// JIT compiler for these functions.
define('foo', function() {});
define('foo/bar', [], function() {});
define('foo/asdf', ['module', 'exports', 'require'], function(module, exports, require) {
if (require.has('foo/bar')) {
require('foo/bar');
}
});
define('foo/baz', [], define.alias('foo'));
define('foo/quz', define.alias('foo'));
define.alias('foo', 'foo/qux');
define('foo/bar', ['foo', './quz', './baz', './asdf', './bar', '../foo'], function() {});
define('foo/main', ['foo/bar'], function() {});
define.exports('foo/exports', {});
require('foo/exports');
require('foo/main');
require.unsee('foo/bar');
requirejs.clear();
if (typeof exports === 'object' && typeof module === 'object' && module.exports) {
module.exports = { require: require, define: define };
}
})(this);