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/* 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/. */
/**
* Implementation of a CommonJS module loader for workers.
*
* Use:
* // in the .js file loaded by the constructor of the worker
* importScripts("resource://gre/modules/workers/require.js");
* let module = require("resource://gre/modules/worker/myModule.js");
*
* // in myModule.js
* // Load dependencies
* let SimpleTest = require("resource://gre/modules/workers/SimpleTest.js");
* let Logger = require("resource://gre/modules/workers/Logger.js");
*
* // Define things that will not be exported
* let someValue = // ...
*
* // Export symbols
* exports.foo = // ...
* exports.bar = // ...
*
*
* Note #1:
* Properties |fileName| and |stack| of errors triggered from a module
* contain file names that do not correspond to human-readable module paths.
* Human readers should rather use properties |moduleName| and |moduleStack|.
*
* Note #2:
* The current version of |require()| only accepts absolute URIs.
*
* Note #3:
* By opposition to some other module loader implementations, this module
* loader does not enforce separation of global objects. Consequently, if
* a module modifies a global object (e.g. |String.prototype|), all other
* modules in the same worker may be affected.
*/
(function(exports) {
"use strict";
if (exports.require) {
// Avoid double-imports
return;
}
// Simple implementation of |require|
let require = (function() {
/**
* Mapping from module paths to module exports.
*
* @keys {string} The absolute path to a module.
* @values {object} The |exports| objects for that module.
*/
let modules = new Map();
/**
* A human-readable version of |stack|.
*
* @type {string}
*/
Object.defineProperty(Error.prototype, "moduleStack",
{
get: function() {
return this.stack;
}
});
/**
* A human-readable version of |fileName|.
*
* @type {string}
*/
Object.defineProperty(Error.prototype, "moduleName",
{
get: function() {
let match = this.stack.match(/\@(.*):.*:/);
if (match) {
return match[1];
}
return "(unknown module)";
}
});
/**
* Import a module
*
* @param {string} path The path to the module.
* @return {*} An object containing the properties exported by the module.
*/
return function require(path) {
if (typeof path != "string" || path.indexOf("://") == -1) {
throw new TypeError("The argument to require() must be a string uri, got " + path);
}
// Automatically add ".js" if there is no extension
let uri;
if (path.lastIndexOf(".") <= path.lastIndexOf("/")) {
uri = path + ".js";
} else {
uri = path;
}
// Exports provided by the module
let exports = Object.create(null);
// Identification of the module
let module = {
id: path,
uri: uri,
exports: exports
};
// Make module available immediately
// (necessary in case of circular dependencies)
if (modules.has(path)) {
return modules.get(path).exports;
}
modules.set(path, module);
try {
// Load source of module, synchronously
let xhr = new XMLHttpRequest();
xhr.open("GET", uri, false);
xhr.responseType = "text";
xhr.send();
let source = xhr.responseText;
if (source == "") {
// There doesn't seem to be a better way to detect that the file couldn't be found
throw new Error("Could not find module " + path);
}
let code = new Function("exports", "require", "module",
source + "\n//# sourceURL=" + uri + "\n"
);
code(exports, require, module);
} catch (ex) {
// Module loading has failed, exports should not be made available
// after all.
modules.delete(path);
throw ex;
}
Object.freeze(module.exports);
Object.freeze(module);
return module.exports;
};
})();
Object.freeze(require);
Object.defineProperty(exports, "require", {
value: require,
enumerable: true,
configurable: false
});
})(this);
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