gecko/toolkit/devtools/Loader.jsm
Dave Camp 23913ae271 Bug 877295 - Allow actors to be loaded as CommonJS modules. r=past
--HG--
extra : rebase_source : c9f1f7da216e006ab1983127f9aa61da25f7da92
2013-06-06 16:06:08 -07:00

261 lines
8.1 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";
/**
* Manages the addon-sdk loader instance used to load the developer tools.
*/
let { classes: Cc, interfaces: Ci, utils: Cu } = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetUtil", "resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "FileUtils", "resource://gre/modules/FileUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "console", "resource://gre/modules/devtools/Console.jsm");
let loader = Cu.import("resource://gre/modules/commonjs/toolkit/loader.js", {}).Loader;
let Promise = Cu.import("resource://gre/modules/commonjs/sdk/core/promise.js", {}).Promise;
this.EXPORTED_SYMBOLS = ["devtools"];
/**
* Providers are different strategies for loading the devtools.
*/
let loaderGlobals = {
console: console,
_Iterator: Iterator,
loader: {
lazyGetter: XPCOMUtils.defineLazyGetter.bind(XPCOMUtils),
lazyImporter: XPCOMUtils.defineLazyModuleGetter.bind(XPCOMUtils)
}
}
// Used when the tools should be loaded from the Firefox package itself (the default)
var BuiltinProvider = {
load: function(done) {
this.loader = new loader.Loader({
modules: {
"toolkit/loader": loader
},
paths: {
"": "resource://gre/modules/commonjs/",
"main": "resource:///modules/devtools/main.js",
"devtools": "resource:///modules/devtools",
"devtools/server": "resource://gre/modules/devtools/server",
// Allow access to xpcshell test items from the loader.
"xpcshell-test": "resource://test"
},
globals: loaderGlobals
});
return Promise.resolve(undefined);
},
unload: function(reason) {
loader.unload(this.loader, reason);
delete this.loader;
},
};
// Used when the tools should be loaded from a mozilla-central checkout. In addition
// to different paths, it needs to write chrome.manifest files to override chrome urls
// from the builtin tools.
var SrcdirProvider = {
fileURI: function(path) {
let file = new FileUtils.File(path);
return Services.io.newFileURI(file).spec;
},
load: function(done) {
let srcdir = Services.prefs.getComplexValue("devtools.loader.srcdir",
Ci.nsISupportsString);
srcdir = OS.Path.normalize(srcdir.data.trim());
let devtoolsDir = OS.Path.join(srcdir, "browser", "devtools");
let devtoolsURI = this.fileURI(devtoolsDir);
let toolkitURI = this.fileURI(OS.Path.join(srcdir, "toolkit", "devtools"));
let serverURI = this.fileURI(OS.Path.join(srcdir, "toolkit", "devtools", "server"));
let mainURI = this.fileURI(OS.Path.join(srcdir, "browser", "devtools", "main.js"));
this.loader = new loader.Loader({
modules: {
"toolkit/loader": loader
},
paths: {
"": "resource://gre/modules/commonjs/",
"devtools/server": serverURI,
"devtools": devtoolsURI,
"main": mainURI
},
globals: loaderGlobals
});
return this._writeManifest(devtoolsDir).then(null, Cu.reportError);
},
unload: function(reason) {
loader.unload(this.loader, reason);
delete this.loader;
},
_readFile: function(filename) {
let deferred = Promise.defer();
let file = new FileUtils.File(filename);
NetUtil.asyncFetch(file, (inputStream, status) => {
if (!Components.isSuccessCode(status)) {
deferred.reject(new Error("Couldn't load manifest: " + filename + "\n"));
return;
}
var data = NetUtil.readInputStreamToString(inputStream, inputStream.available());
deferred.resolve(data);
});
return deferred.promise;
},
_writeFile: function(filename, data) {
let deferred = Promise.defer();
let file = new FileUtils.File(filename);
var ostream = FileUtils.openSafeFileOutputStream(file)
var converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"].
createInstance(Ci.nsIScriptableUnicodeConverter);
converter.charset = "UTF-8";
var istream = converter.convertToInputStream(data);
NetUtil.asyncCopy(istream, ostream, (status) => {
if (!Components.isSuccessCode(status)) {
deferred.reject(new Error("Couldn't write manifest: " + filename + "\n"));
return;
}
deferred.resolve(null);
});
return deferred.promise;
},
_writeManifest: function(dir) {
return this._readFile(OS.Path.join(dir, "jar.mn")).then((data) => {
// The file data is contained within inputStream.
// You can read it into a string with
let entries = [];
let lines = data.split(/\n/);
let preprocessed = /^\s*\*/;
let contentEntry = new RegExp("^\\s+content/(\\w+)/(\\S+)\\s+\\((\\S+)\\)");
for (let line of lines) {
if (preprocessed.test(line)) {
dump("Unable to override preprocessed file: " + line + "\n");
continue;
}
let match = contentEntry.exec(line);
if (match) {
let pathComponents = match[3].split("/");
pathComponents.unshift(dir);
let path = OS.Path.join.apply(OS.Path, pathComponents);
let uri = this.fileURI(path);
let entry = "override chrome://" + match[1] + "/content/" + match[2] + "\t" + uri;
entries.push(entry);
}
}
return this._writeFile(OS.Path.join(dir, "chrome.manifest"), entries.join("\n"));
}).then(() => {
Components.manager.addBootstrappedManifestLocation(new FileUtils.File(dir));
});
}
};
/**
* The main devtools API.
* In addition to a few loader-related details, this object will also include all
* exports from the main module.
*/
this.devtools = {
_provider: null,
/**
* Add a URI to the loader.
* @param string id
* The module id that can be used within the loader to refer to this module.
* @param string uri
* The URI to load as a module.
* @returns The module's exports.
*/
loadURI: function(id, uri) {
let module = loader.Module(id, uri);
return loader.load(this._provider.loader, module).exports;
},
/**
* Let the loader know the ID of the main module to load.
*
* The loader doesn't need a main module, but it's nice to have. This
* will be called by the browser devtools to load the devtools/main module.
*
* When only using the server, there's no main module, and this method
* can be ignored.
*/
main: function(id) {
this._mainid = id;
this._main = loader.main(this._provider.loader, id);
// Mirror the main module's exports on this object.
Object.getOwnPropertyNames(this._main).forEach(key => {
XPCOMUtils.defineLazyGetter(this, key, () => this._main[key]);
});
},
/**
* Override the provider used to load the tools.
*/
setProvider: function(provider) {
if (provider === this._provider) {
return;
}
if (this._provider) {
var events = this.require("sdk/system/events");
events.emit("devtools-unloaded", {});
delete this.require;
this._provider.unload("newprovider");
}
this._provider = provider;
this._provider.load();
this.require = loader.Require(this._provider.loader, { id: "devtools" });
if (this._mainid) {
this.main(this._mainid);
}
},
/**
* Choose a default tools provider based on the preferences.
*/
_chooseProvider: function() {
if (Services.prefs.prefHasUserValue("devtools.loader.srcdir")) {
this.setProvider(SrcdirProvider);
} else {
this.setProvider(BuiltinProvider);
}
},
/**
* Reload the current provider.
*/
reload: function() {
var events = this.require("sdk/system/events");
events.emit("startupcache-invalidate", {});
events.emit("devtools-unloaded", {});
this._provider.unload("reload");
delete this._provider;
this._chooseProvider();
},
};
// Now load the tools.
devtools._chooseProvider();