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": "experimental"
michael@0: };
michael@0: 
michael@0: const { Cc, Ci } = require("chrome");
michael@0: const { Class } = require("../core/heritage");
michael@0: const { ns } = require("../core/namespace");
michael@0: const { URL } = require('../url');
michael@0: const events = require("../system/events");
michael@0: const { loadSheet, removeSheet, isTypeValid } = require("./utils");
michael@0: const { isString } = require("../lang/type");
michael@0: const { attachTo, detachFrom, getTargetWindow } = require("../content/mod");
michael@0: 
michael@0: const { freeze, create } = Object;
michael@0: const LOCAL_URI_SCHEMES = ['resource', 'data'];
michael@0: 
michael@0: function isLocalURL(item) {
michael@0:   try {
michael@0:     return LOCAL_URI_SCHEMES.indexOf(URL(item).scheme) > -1;
michael@0:   }
michael@0:   catch(e) {}
michael@0: 
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: function Style({ source, uri, type }) {
michael@0:   source = source == null ? null : freeze([].concat(source));
michael@0:   uri = uri == null ? null : freeze([].concat(uri));
michael@0:   type = type == null ? "author" : type;
michael@0: 
michael@0:   if (source && !source.every(isString))
michael@0:     throw new Error('Style.source must be a string or an array of strings.');
michael@0: 
michael@0:   if (uri && !uri.every(isLocalURL))
michael@0:     throw new Error('Style.uri must be a local URL or an array of local URLs');
michael@0: 
michael@0:   if (type && !isTypeValid(type))
michael@0:     throw new Error('Style.type must be "agent", "user" or "author"');
michael@0: 
michael@0:   return freeze(create(Style.prototype, {
michael@0:     "source": { value: source, enumerable: true },
michael@0:     "uri": { value: uri, enumerable: true },
michael@0:     "type": { value: type, enumerable: true }
michael@0:   }));
michael@0: };
michael@0: 
michael@0: exports.Style = Style;
michael@0: 
michael@0: attachTo.define(Style, function (style, window) {
michael@0:   if (style.uri) {
michael@0:     for (let uri of style.uri)
michael@0:       loadSheet(window, uri, style.type);
michael@0:   }
michael@0: 
michael@0:   if (style.source) {
michael@0:     let uri = "data:text/css;charset=utf-8,";
michael@0: 
michael@0:     uri += encodeURIComponent(style.source.join(""));
michael@0: 
michael@0:     loadSheet(window, uri, style.type);
michael@0:   }
michael@0: });
michael@0: 
michael@0: detachFrom.define(Style, function (style, window) {
michael@0:   if (style.uri)
michael@0:     for (let uri of style.uri)
michael@0:       removeSheet(window, uri);
michael@0: 
michael@0:   if (style.source) {
michael@0:     let uri = "data:text/css;charset=utf-8,";
michael@0: 
michael@0:     uri += encodeURIComponent(style.source.join(""));
michael@0: 
michael@0:     removeSheet(window, uri, style.type);
michael@0:   }
michael@0: });