151 lines
3.6 KiB
JavaScript
151 lines
3.6 KiB
JavaScript
/**
|
|
* 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 isNodeText(node)
|
|
{
|
|
return (node.nodeType == 3);
|
|
}
|
|
|
|
function object(o)
|
|
{
|
|
var f = function()
|
|
{};
|
|
f.prototype = o;
|
|
return new f();
|
|
}
|
|
|
|
function extend(obj, props)
|
|
{
|
|
for (var p in props)
|
|
{
|
|
obj[p] = props[p];
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
function forEach(array, func)
|
|
{
|
|
for (var i = 0; i < array.length; i++)
|
|
{
|
|
var result = func(array[i], i);
|
|
if (result) break;
|
|
}
|
|
}
|
|
|
|
function map(array, func)
|
|
{
|
|
var result = [];
|
|
// must remain compatible with "arguments" pseudo-array
|
|
for (var i = 0; i < array.length; i++)
|
|
{
|
|
if (func) result.push(func(array[i], i));
|
|
else result.push(array[i]);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function filter(array, func)
|
|
{
|
|
var result = [];
|
|
// must remain compatible with "arguments" pseudo-array
|
|
for (var i = 0; i < array.length; i++)
|
|
{
|
|
if (func(array[i], i)) result.push(array[i]);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function isArray(testObject)
|
|
{
|
|
return testObject && typeof testObject === 'object' && !(testObject.propertyIsEnumerable('length')) && typeof testObject.length === 'number';
|
|
}
|
|
|
|
if (typeof exports !== "undefined")
|
|
{
|
|
userAgent = "node-js";
|
|
}
|
|
else
|
|
{
|
|
userAgent = navigator.userAgent.toLowerCase();
|
|
}
|
|
// Figure out what browser is being used (stolen from jquery 1.2.1)
|
|
var browser = {
|
|
version: (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1],
|
|
safari: /webkit/.test(userAgent),
|
|
opera: /opera/.test(userAgent),
|
|
msie: /msie/.test(userAgent) && !/opera/.test(userAgent),
|
|
mozilla: /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent),
|
|
windows: /windows/.test(userAgent) // dgreensp
|
|
};
|
|
|
|
|
|
function getAssoc(obj, name)
|
|
{
|
|
return obj["_magicdom_" + name];
|
|
}
|
|
|
|
function setAssoc(obj, name, value)
|
|
{
|
|
// note that in IE designMode, properties of a node can get
|
|
// copied to new nodes that are spawned during editing; also,
|
|
// properties representable in HTML text can survive copy-and-paste
|
|
obj["_magicdom_" + name] = value;
|
|
}
|
|
|
|
// "func" is a function over 0..(numItems-1) that is monotonically
|
|
// "increasing" with index (false, then true). Finds the boundary
|
|
// between false and true, a number between 0 and numItems inclusive.
|
|
|
|
|
|
function binarySearch(numItems, func)
|
|
{
|
|
if (numItems < 1) return 0;
|
|
if (func(0)) return 0;
|
|
if (!func(numItems - 1)) return numItems;
|
|
var low = 0; // func(low) is always false
|
|
var high = numItems - 1; // func(high) is always true
|
|
while ((high - low) > 1)
|
|
{
|
|
var x = Math.floor((low + high) / 2); // x != low, x != high
|
|
if (func(x)) high = x;
|
|
else low = x;
|
|
}
|
|
return high;
|
|
}
|
|
|
|
function binarySearchInfinite(expectedLength, func)
|
|
{
|
|
var i = 0;
|
|
while (!func(i)) i += expectedLength;
|
|
return binarySearch(i, func);
|
|
}
|
|
|
|
function htmlPrettyEscape(str)
|
|
{
|
|
return str.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/\r?\n/g, '\\n');
|
|
}
|
|
|
|
if (typeof exports !== "undefined")
|
|
{
|
|
exports.map = map;
|
|
}
|