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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et: */
/* 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";
const observers = require("api-utils/observer-service");
const { Worker, Loader } = require('api-utils/content');
const { EventEmitter } = require('api-utils/events');
const { List } = require('api-utils/list');
const { Registry } = require('api-utils/utils/registry');
const xulApp = require("api-utils/xul-app");
const { MatchPattern } = require('api-utils/match-pattern');
// Whether or not the host application dispatches a document-element-inserted
// notification when the document element is inserted into the DOM of a page.
// The notification was added in Gecko 2.0b6, it's a better time to attach
// scripts with contentScriptWhen "start" than content-document-global-created,
// since libraries like jQuery assume the presence of the document element.
const HAS_DOCUMENT_ELEMENT_INSERTED =
xulApp.versionInRange(xulApp.platformVersion, "2.0b6", "*");
const ON_CONTENT = HAS_DOCUMENT_ELEMENT_INSERTED ? 'document-element-inserted' :
'content-document-global-created';
// Workaround bug 642145: document-element-inserted is fired multiple times.
// This bug is fixed in Firefox 4.0.1, but we want to keep FF 4.0 compatibility
// Tracking bug 641457. To be removed when 4.0 has disappeared from earth.
const HAS_BUG_642145_FIXED =
xulApp.versionInRange(xulApp.platformVersion, "2.0.1", "*");
// rules registry
const RULES = {};
const Rules = EventEmitter.resolve({ toString: null }).compose(List, {
add: function() Array.slice(arguments).forEach(function onAdd(rule) {
if (this._has(rule))
return;
// registering rule to the rules registry
if (!(rule in RULES))
RULES[rule] = new MatchPattern(rule);
this._add(rule);
this._emit('add', rule);
}.bind(this)),
remove: function() Array.slice(arguments).forEach(function onRemove(rule) {
if (!this._has(rule))
return;
this._remove(rule);
this._emit('remove', rule);
}.bind(this)),
});
/**
* PageMod constructor (exported below).
* @constructor
*/
const PageMod = Loader.compose(EventEmitter, {
on: EventEmitter.required,
_listeners: EventEmitter.required,
contentScript: Loader.required,
contentScriptFile: Loader.required,
contentScriptWhen: Loader.required,
include: null,
constructor: function PageMod(options) {
this._onContent = this._onContent.bind(this);
options = options || {};
if ('contentScript' in options)
this.contentScript = options.contentScript;
if ('contentScriptFile' in options)
this.contentScriptFile = options.contentScriptFile;
if ('contentScriptWhen' in options)
this.contentScriptWhen = options.contentScriptWhen;
if ('onAttach' in options)
this.on('attach', options.onAttach);
if ('onError' in options)
this.on('error', options.onError);
let include = options.include;
let rules = this.include = Rules();
rules.on('add', this._onRuleAdd = this._onRuleAdd.bind(this));
rules.on('remove', this._onRuleRemove = this._onRuleRemove.bind(this));
if (Array.isArray(include))
rules.add.apply(null, include);
else
rules.add(include);
this.on('error', this._onUncaughtError = this._onUncaughtError.bind(this));
pageModManager.add(this._public);
this._loadingWindows = [];
},
destroy: function destroy() {
for each (let rule in this.include)
this.include.remove(rule);
pageModManager.remove(this._public);
this._loadingWindows = [];
},
_loadingWindows: [],
_onContent: function _onContent(window) {
// not registered yet
if (!pageModManager.has(this))
return;
if (!HAS_BUG_642145_FIXED) {
if (this._loadingWindows.indexOf(window) != -1)
return;
this._loadingWindows.push(window);
}
if ('start' == this.contentScriptWhen) {
this._createWorker(window);
return;
}
let eventName = 'end' == this.contentScriptWhen ? 'load' : 'DOMContentLoaded';
let self = this;
window.addEventListener(eventName, function onReady(event) {
if (event.target.defaultView != window)
return;
window.removeEventListener(eventName, onReady, true);
self._createWorker(window);
}, true);
},
_createWorker: function _createWorker(window) {
let worker = Worker({
window: window,
contentScript: this.contentScript,
contentScriptFile: this.contentScriptFile,
onError: this._onUncaughtError
});
this._emit('attach', worker);
let self = this;
worker.once('detach', function detach() {
worker.destroy();
if (!HAS_BUG_642145_FIXED) {
let idx = self._loadingWindows.indexOf(window);
if (idx != -1)
self._loadingWindows.splice(idx, 1);
}
});
},
_onRuleAdd: function _onRuleAdd(url) {
pageModManager.on(url, this._onContent);
},
_onRuleRemove: function _onRuleRemove(url) {
pageModManager.off(url, this._onContent);
},
_onUncaughtError: function _onUncaughtError(e) {
if (this._listeners('error').length == 1)
console.exception(e);
}
});
exports.PageMod = function(options) PageMod(options)
exports.PageMod.prototype = PageMod.prototype;
const PageModManager = Registry.resolve({
constructor: '_init',
_destructor: '_registryDestructor'
}).compose({
constructor: function PageModRegistry(constructor) {
this._init(PageMod);
observers.add(
ON_CONTENT, this._onContentWindow = this._onContentWindow.bind(this)
);
},
_destructor: function _destructor() {
observers.remove(ON_CONTENT, this._onContentWindow);
this._removeAllListeners();
for (let rule in RULES) {
delete RULES[rule];
}
this._registryDestructor();
},
_onContentWindow: function _onContentWindow(domObj) {
let window = HAS_DOCUMENT_ELEMENT_INSERTED ? domObj.defaultView : domObj;
// XML documents don't have windows, and we don't yet support them.
if (!window)
return;
for (let rule in RULES)
if (RULES[rule].test(window.document.URL))
this._emit(rule, window);
},
off: function off(topic, listener) {
this.removeListener(topic, listener);
if (!this._listeners(topic).length)
delete RULES[topic];
}
});
const pageModManager = PageModManager();
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