132 lines
3.3 KiB
JavaScript
132 lines
3.3 KiB
JavaScript
/**
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* Copyright 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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function isNodeText(node)
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{
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return (node.nodeType == 3);
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}
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function object(o)
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{
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var f = function()
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{};
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f.prototype = o;
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return new f();
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}
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function extend(obj, props)
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{
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for (var p in props)
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{
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obj[p] = props[p];
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}
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return obj;
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}
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function forEach(array, func)
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{
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for (var i = 0; i < array.length; i++)
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{
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var result = func(array[i], i);
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if (result) break;
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}
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}
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function map(array, func)
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{
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var result = [];
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// must remain compatible with "arguments" pseudo-array
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for (var i = 0; i < array.length; i++)
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{
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if (func) result.push(func(array[i], i));
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else result.push(array[i]);
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}
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return result;
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}
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function filter(array, func)
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{
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var result = [];
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// must remain compatible with "arguments" pseudo-array
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for (var i = 0; i < array.length; i++)
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{
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if (func(array[i], i)) result.push(array[i]);
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}
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return result;
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}
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function isArray(testObject)
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{
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return testObject && typeof testObject === 'object' && !(testObject.propertyIsEnumerable('length')) && typeof testObject.length === 'number';
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}
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// Figure out what browser is being used (stolen from jquery 1.2.1)
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var userAgent = navigator.userAgent.toLowerCase();
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var browser = {
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version: (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1],
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safari: /webkit/.test(userAgent),
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opera: /opera/.test(userAgent),
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msie: /msie/.test(userAgent) && !/opera/.test(userAgent),
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mozilla: /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent),
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windows: /windows/.test(userAgent) // dgreensp
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};
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function getAssoc(obj, name)
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{
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return obj["_magicdom_" + name];
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}
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function setAssoc(obj, name, value)
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{
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// note that in IE designMode, properties of a node can get
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// copied to new nodes that are spawned during editing; also,
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// properties representable in HTML text can survive copy-and-paste
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obj["_magicdom_" + name] = value;
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}
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// "func" is a function over 0..(numItems-1) that is monotonically
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// "increasing" with index (false, then true). Finds the boundary
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// between false and true, a number between 0 and numItems inclusive.
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function binarySearch(numItems, func)
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{
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if (numItems < 1) return 0;
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if (func(0)) return 0;
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if (!func(numItems - 1)) return numItems;
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var low = 0; // func(low) is always false
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var high = numItems - 1; // func(high) is always true
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while ((high - low) > 1)
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{
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var x = Math.floor((low + high) / 2); // x != low, x != high
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if (func(x)) high = x;
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else low = x;
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}
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return high;
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}
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function binarySearchInfinite(expectedLength, func)
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{
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var i = 0;
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while (!func(i)) i += expectedLength;
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return binarySearch(i, func);
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}
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function htmlPrettyEscape(str)
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{
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return str.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/\r?\n/g, '\\n');
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}
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