michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 'use strict';
michael@0: 
michael@0: module.metadata = {
michael@0:   'stability': 'unstable'
michael@0: };
michael@0: 
michael@0: let { merge } = require('../util/object');
michael@0: let assetsURI = require('../self').data.url();
michael@0: let isArray = Array.isArray;
michael@0: let method = require('../../method/core');
michael@0: 
michael@0: function isAddonContent({ contentURL }) {
michael@0:   return typeof(contentURL) === 'string' && contentURL.indexOf(assetsURI) === 0;
michael@0: }
michael@0: exports.isAddonContent = isAddonContent;
michael@0: 
michael@0: function hasContentScript({ contentScript, contentScriptFile }) {
michael@0:   return (isArray(contentScript) ? contentScript.length > 0 :
michael@0:          !!contentScript) ||
michael@0:          (isArray(contentScriptFile) ? contentScriptFile.length > 0 :
michael@0:          !!contentScriptFile);
michael@0: }
michael@0: exports.hasContentScript = hasContentScript;
michael@0: 
michael@0: function requiresAddonGlobal(model) {
michael@0:   return model.injectInDocument || (isAddonContent(model) && !hasContentScript(model));
michael@0: }
michael@0: exports.requiresAddonGlobal = requiresAddonGlobal;
michael@0: 
michael@0: function getAttachEventType(model) {
michael@0:   if (!model) return null;
michael@0:   let when = model.contentScriptWhen;
michael@0:   return requiresAddonGlobal(model) ? 'document-element-inserted' :
michael@0:          when === 'start' ? 'document-element-inserted' :
michael@0:          when === 'ready' ? 'DOMContentLoaded' :
michael@0:          when === 'end' ? 'load' :
michael@0:          null;
michael@0: }
michael@0: exports.getAttachEventType = getAttachEventType;
michael@0: 
michael@0: let attach = method('worker-attach');
michael@0: exports.attach = attach;
michael@0: 
michael@0: let detach = method('worker-detach');
michael@0: exports.detach = detach;
michael@0: 
michael@0: let destroy = method('worker-destroy');
michael@0: exports.destroy = destroy;
michael@0: 
michael@0: function WorkerHost (workerFor) {
michael@0:   // Define worker properties that just proxy to underlying worker
michael@0:   return ['postMessage', 'port', 'url', 'tab'].reduce(function(proto, name) {
michael@0:     // Use descriptor properties instead so we can call
michael@0:     // the worker function in the context of the worker so we
michael@0:     // don't have to create new functions with `fn.bind(worker)`
michael@0:     let descriptorProp = {
michael@0:       value: function (...args) {
michael@0:         let worker = workerFor(this);
michael@0:         return worker[name].apply(worker, args);
michael@0:       }
michael@0:     };
michael@0:     
michael@0:     let accessorProp = {
michael@0:       get: function () { return workerFor(this)[name]; },
michael@0:       set: function (value) { workerFor(this)[name] = value; }
michael@0:     };
michael@0: 
michael@0:     Object.defineProperty(proto, name, merge({
michael@0:       enumerable: true,
michael@0:       configurable: false,
michael@0:     }, isDescriptor(name) ? descriptorProp : accessorProp));
michael@0:     return proto;
michael@0:   }, {});
michael@0:   
michael@0:   function isDescriptor (prop) {
michael@0:     return ~['postMessage'].indexOf(prop);
michael@0:   }
michael@0: }
michael@0: exports.WorkerHost = WorkerHost;