153 lines
4.2 KiB
JavaScript
153 lines
4.2 KiB
JavaScript
/* -*- Mode: js; js-indent-level: 2; -*- */
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/*
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* Copyright 2011 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE or:
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* http://opensource.org/licenses/BSD-3-Clause
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*/
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/**
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* Define a module along with a payload.
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* @param {string} moduleName Name for the payload
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* @param {ignored} deps Ignored. For compatibility with CommonJS AMD Spec
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* @param {function} payload Function with (require, exports, module) params
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*/
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function define(moduleName, deps, payload) {
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if (typeof moduleName != "string") {
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throw new TypeError('Expected string, got: ' + moduleName);
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}
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if (arguments.length == 2) {
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payload = deps;
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}
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if (moduleName in define.modules) {
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throw new Error("Module already defined: " + moduleName);
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}
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define.modules[moduleName] = payload;
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};
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/**
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* The global store of un-instantiated modules
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*/
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define.modules = {};
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/**
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* We invoke require() in the context of a Domain so we can have multiple
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* sets of modules running separate from each other.
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* This contrasts with JSMs which are singletons, Domains allows us to
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* optionally load a CommonJS module twice with separate data each time.
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* Perhaps you want 2 command lines with a different set of commands in each,
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* for example.
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*/
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function Domain() {
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this.modules = {};
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this._currentModule = null;
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}
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(function () {
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/**
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* Lookup module names and resolve them by calling the definition function if
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* needed.
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* There are 2 ways to call this, either with an array of dependencies and a
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* callback to call when the dependencies are found (which can happen
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* asynchronously in an in-page context) or with a single string an no callback
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* where the dependency is resolved synchronously and returned.
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* The API is designed to be compatible with the CommonJS AMD spec and
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* RequireJS.
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* @param {string[]|string} deps A name, or names for the payload
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* @param {function|undefined} callback Function to call when the dependencies
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* are resolved
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* @return {undefined|object} The module required or undefined for
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* array/callback method
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*/
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Domain.prototype.require = function(deps, callback) {
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if (Array.isArray(deps)) {
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var params = deps.map(function(dep) {
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return this.lookup(dep);
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}, this);
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if (callback) {
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callback.apply(null, params);
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}
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return undefined;
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}
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else {
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return this.lookup(deps);
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}
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};
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function normalize(path) {
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var bits = path.split('/');
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var i = 1;
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while (i < bits.length) {
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if (bits[i] === '..') {
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bits.splice(i-1, 1);
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} else if (bits[i] === '.') {
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bits.splice(i, 1);
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} else {
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i++;
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}
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}
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return bits.join('/');
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}
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function join(a, b) {
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a = a.trim();
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b = b.trim();
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if (/^\//.test(b)) {
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return b;
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} else {
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return a.replace(/\/*$/, '/') + b;
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}
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}
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function dirname(path) {
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var bits = path.split('/');
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bits.pop();
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return bits.join('/');
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}
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/**
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* Lookup module names and resolve them by calling the definition function if
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* needed.
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* @param {string} moduleName A name for the payload to lookup
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* @return {object} The module specified by aModuleName or null if not found.
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*/
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Domain.prototype.lookup = function(moduleName) {
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if (/^\./.test(moduleName)) {
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moduleName = normalize(join(dirname(this._currentModule), moduleName));
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}
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if (moduleName in this.modules) {
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var module = this.modules[moduleName];
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return module;
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}
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if (!(moduleName in define.modules)) {
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throw new Error("Module not defined: " + moduleName);
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}
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var module = define.modules[moduleName];
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if (typeof module == "function") {
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var exports = {};
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var previousModule = this._currentModule;
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this._currentModule = moduleName;
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module(this.require.bind(this), exports, { id: moduleName, uri: "" });
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this._currentModule = previousModule;
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module = exports;
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}
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// cache the resulting module object for next time
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this.modules[moduleName] = module;
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return module;
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};
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}());
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define.Domain = Domain;
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define.globalDomain = new Domain();
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var require = define.globalDomain.require.bind(define.globalDomain);
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