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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* The global object.
* @param {!Object}
*/
const global = this;
/**
* Alias for document.getElementById.
* @param {string} id The ID of the element to find.
* @return {HTMLElement} The found element or null if not found.
*/
function $(id) {
return document.getElementById(id);
}
/**
* Calls chrome.send with a callback and restores the original afterwards.
* @param {string} name The name of the message to send.
* @param {!Array} params The parameters to send.
* @param {string} callbackName The name of the function that the backend calls.
* @param {!Function} The function to call.
*/
function chromeSend(name, params, callbackName, callback) {
var old = global[callbackName];
global[callbackName] = function() {
// restore
global[callbackName] = old;
var args = Array.prototype.slice.call(arguments);
return callback.apply(global, args);
};
chrome.send(name, params);
}
/**
* Generates a CSS url string.
* @param {string} s The URL to generate the CSS url for.
* @return {string} The CSS url string.
*/
function url(s) {
// http://www.w3.org/TR/css3-values/#uris
// Parentheses, commas, whitespace characters, single quotes (') and double
// quotes (") appearing in a URI must be escaped with a backslash
var s2 = s.replace(/(\(|\)|\,|\s|\'|\"|\\)/g, '\\$1');
// WebKit has a bug when it comes to URLs that end with \
// https://bugs.webkit.org/show_bug.cgi?id=28885
if (/\\\\$/.test(s2)) {
// Add a space to work around the WebKit bug.
s2 += ' ';
}
return 'url("' + s2 + '")';
}
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