gecko-dev/toolkit/devtools/Require.jsm

196 lines
5.5 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* Require.jsm is a small module loader that loads JavaScript modules as
* defined by AMD/RequireJS and CommonJS, or specifically as used by:
* GCLI, Orion, Firebug, CCDump, NetPanel/HTTPMonitor and others.
*
* To date, no attempt has been made to ensure that Require.jsm closely follows
* either the AMD or CommonJS specs. It is hoped that a more formal JavaScript
* module standard will arrive before this is necessary. In the mean time it
* serves the projects it loads.
*/
this.EXPORTED_SYMBOLS = [ "define", "require" ];
const console = (function() {
const tempScope = {};
Components.utils.import("resource://gre/modules/devtools/Console.jsm", tempScope);
return tempScope.console;
})();
/**
* Define a module along with a payload.
* @param moduleName Name for the payload
* @param deps Ignored. For compatibility with CommonJS AMD Spec
* @param payload Function with (require, exports, module) params
*/
this.define = function define(moduleName, deps, payload) {
if (typeof moduleName != "string") {
throw new Error("Error: Module name is not a string");
}
if (arguments.length == 2) {
payload = deps;
}
else {
payload.deps = deps;
}
if (define.debugDependencies) {
console.log("define: " + moduleName + " -> " + payload.toString()
.slice(0, 40).replace(/\n/, '\\n').replace(/\r/, '\\r') + "...");
}
if (moduleName in define.modules) {
throw new Error("Error: Redefining module: " + moduleName);
}
// Mark the payload so we know we need to call it to get the real module
payload.__uncompiled = true;
define.modules[moduleName] = payload;
}
/**
* The global store of un-instantiated modules
*/
define.modules = {};
/**
* Should we console.log on module definition/instantiation/requirement?
*/
define.debugDependencies = false;
/**
* We invoke require() in the context of a Domain so we can have multiple
* sets of modules running separate from each other.
* This contrasts with JSMs which are singletons, Domains allows us to
* optionally load a CommonJS module twice with separate data each time.
* Perhaps you want 2 command lines with a different set of commands in each,
* for example.
*/
function Domain() {
this.modules = {};
if (define.debugDependencies) {
this.depth = "";
}
}
/**
* Lookup module names and resolve them by calling the definition function if
* needed.
* There are 2 ways to call this, either with an array of dependencies and a
* callback to call when the dependencies are found (which can happen
* asynchronously in an in-page context) or with a single string an no
* callback where the dependency is resolved synchronously and returned.
* The API is designed to be compatible with the CommonJS AMD spec and
* RequireJS.
* @param deps A name, or array of names for the payload
* @param callback Function to call when the dependencies are resolved
* @return The module required or undefined for array/callback method
*/
Domain.prototype.require = function(config, deps, callback) {
if (arguments.length <= 2) {
callback = deps;
deps = config;
config = undefined;
}
if (Array.isArray(deps)) {
var params = deps.map(function(dep) {
return this.lookup(dep);
}, this);
if (callback) {
callback.apply(null, params);
}
return undefined;
}
else {
return this.lookup(deps);
}
};
/**
* Lookup module names and resolve them by calling the definition function if
* needed.
* @param moduleName A name for the payload to lookup
* @return The module specified by aModuleName or null if not found
*/
Domain.prototype.lookup = function(moduleName) {
if (moduleName in this.modules) {
var module = this.modules[moduleName];
if (define.debugDependencies) {
console.log(this.depth + " Using module: " + moduleName);
}
return module;
}
if (!(moduleName in define.modules)) {
throw new Error("Missing module: " + moduleName);
}
var module = define.modules[moduleName];
if (define.debugDependencies) {
console.log(this.depth + " Compiling module: " + moduleName);
}
if (module.__uncompiled) {
if (define.debugDependencies) {
this.depth += ".";
}
var exports = {};
try {
var params = module.deps.map((dep) => {
if (dep === "require") {
return this.require.bind(this);
}
if (dep === "exports") {
return exports;
}
if (dep === "module") {
return { id: moduleName, uri: "" };
}
return this.lookup(dep);
});
var reply = module.apply(null, params);
module = (reply !== undefined) ? reply : exports;
}
catch (ex) {
dump("Error using module '" + moduleName + "' - " + ex + "\n");
throw ex;
}
if (define.debugDependencies) {
this.depth = this.depth.slice(0, -1);
}
}
// cache the resulting module object for next time
this.modules[moduleName] = module;
return module;
};
/**
* Expose the Domain constructor and a global domain (on the define function
* to avoid exporting more than we need. This is a common pattern with
* require systems)
*/
define.Domain = Domain;
define.globalDomain = new Domain();
/**
* Expose a default require function which is the require of the global
* sandbox to make it easy to use.
*/
this.require = define.globalDomain.require.bind(define.globalDomain);