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/**
* This code is mostly from the old Etherpad. Please help us to comment this code.
* This helps other people to understand this code better and helps them to improve it.
* TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
*/
/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function makeCSSManager(emptyStylesheetTitle, parentCss)
{
function getSheetByTitle(title)
{
if (parentCss) var allSheets = window.parent.parent.document.styleSheets;
else var allSheets = document.styleSheets;
for (var i = 0; i < allSheets.length; i++)
{
var s = allSheets[i];
if (s.title == title)
{
return s;
}
}
return null;
}
var browserSheet = getSheetByTitle(emptyStylesheetTitle, parentCss);
function browserRules()
{
return (browserSheet.cssRules || browserSheet.rules);
}
function browserDeleteRule(i)
{
if (browserSheet.deleteRule) browserSheet.deleteRule(i);
else browserSheet.removeRule(i);
}
function browserInsertRule(i, selector)
{
if (browserSheet.insertRule) browserSheet.insertRule(selector + ' {}', i);
else browserSheet.addRule(selector, null, i);
}
var selectorList = [];
function indexOfSelector(selector)
{
for (var i = 0; i < selectorList.length; i++)
{
if (selectorList[i] == selector)
{
return i;
}
}
return -1;
}
function selectorStyle(selector)
{
var i = indexOfSelector(selector);
if (i < 0)
{
// add selector
browserInsertRule(0, selector);
selectorList.splice(0, 0, selector);
i = 0;
}
return browserRules().item(i).style;
}
function removeSelectorStyle(selector)
{
var i = indexOfSelector(selector);
if (i >= 0)
{
browserDeleteRule(i);
selectorList.splice(i, 1);
}
}
return {
selectorStyle: selectorStyle,
removeSelectorStyle: removeSelectorStyle,
info: function()
{
return selectorList.length + ":" + browserRules().length;
}
};
}
exports.makeCSSManager = makeCSSManager;
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