The Tor Browser: addon-sdk/source/lib/sdk/stylesheet/style.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     4 "use strict";

     6 module.metadata = {

     7   "stability": "experimental"

     8 };

    10 const { Cc, Ci } = require("chrome");

    11 const { Class } = require("../core/heritage");

    12 const { ns } = require("../core/namespace");

    13 const { URL } = require('../url');

    14 const events = require("../system/events");

    15 const { loadSheet, removeSheet, isTypeValid } = require("./utils");

    16 const { isString } = require("../lang/type");

    17 const { attachTo, detachFrom, getTargetWindow } = require("../content/mod");

    19 const { freeze, create } = Object;

    20 const LOCAL_URI_SCHEMES = ['resource', 'data'];

    22 function isLocalURL(item) {

    23   try {

    24     return LOCAL_URI_SCHEMES.indexOf(URL(item).scheme) > -1;

    25   }

    26   catch(e) {}

    28   return false;

    29 }

    31 function Style({ source, uri, type }) {

    32   source = source == null ? null : freeze([].concat(source));

    33   uri = uri == null ? null : freeze([].concat(uri));

    34   type = type == null ? "author" : type;

    36   if (source && !source.every(isString))

    37     throw new Error('Style.source must be a string or an array of strings.');

    39   if (uri && !uri.every(isLocalURL))

    40     throw new Error('Style.uri must be a local URL or an array of local URLs');

    42   if (type && !isTypeValid(type))

    43     throw new Error('Style.type must be "agent", "user" or "author"');

    45   return freeze(create(Style.prototype, {

    46     "source": { value: source, enumerable: true },

    47     "uri": { value: uri, enumerable: true },

    48     "type": { value: type, enumerable: true }

    49   }));

    50 };

    52 exports.Style = Style;

    54 attachTo.define(Style, function (style, window) {

    55   if (style.uri) {

    56     for (let uri of style.uri)

    57       loadSheet(window, uri, style.type);

    58   }

    60   if (style.source) {

    61     let uri = "data:text/css;charset=utf-8,";

    63     uri += encodeURIComponent(style.source.join(""));

    65     loadSheet(window, uri, style.type);

    66   }

    67 });

    69 detachFrom.define(Style, function (style, window) {

    70   if (style.uri)

    71     for (let uri of style.uri)

    72       removeSheet(window, uri);

    74   if (style.source) {

    75     let uri = "data:text/css;charset=utf-8,";

    77     uri += encodeURIComponent(style.source.join(""));

    79     removeSheet(window, uri, style.type);

    80   }

    81 });

The Tor Browser / file revision