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/**
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* 文本差异化比对工具，用于比对两段文本之间所存在的差异；
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* 对HTML文本的比对中，会完全忽略标签内的差异，将<...>
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* 中的内容当做一个整体的单词；
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* 注1：现有版本还未对执行效率进行优化；
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* 注2：原始算法来自于网络:http://www.rohland.co.za/index.php/2009/10/31/csharp-html-diff-algorithm/
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* 注3：效率真低啊..........╮(╯▽╰)╭
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* @author zhoujq | http://weibo.com/buxiaodewa
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*/
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(function () {
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var root = self;
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/**
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* 匹配描述块，一个用来表示相同内容块在新旧文档内位置的描述对象
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* @param {Number} startInOld [相同部分在旧文档中的起始位置]
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* @param {Number} startInNew [相同部分在新文档中的起始位置]
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* @param {Number} size [相同部分的连续词元个数]
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*/
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var Match = function (startInOld, startInNew, size) {
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this.size = size;
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this.startInOld = startInOld;
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this.startInNew = startInNew;
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this.endInOld = this.startInOld + this.size;
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this.endInNew = this.startInNew + this.size;
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};
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/**
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* 操作单元，一个操作单元描述了在具体位置所要
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* 执行的具体操作(如：insert、delete、equal与replace)
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* @param {Function} action
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* @param {Number} startInOld [相同部分在旧文档中的起始位置]
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* @param {Number} endInOld [相同部分在旧文档中的结束位置]
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* @param {Number} startInNew [相同部分在新文档中的起始位置]
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* @param {Number} endInNew [相同部分在新文档中的结束位置]
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*/
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var Operation = function (action, startInOld, endInOld, startInNew, endInNew) {
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this.action = action;
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this.endInOld = endInOld;
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this.endInNew = endInNew;
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this.startInOld = startInOld;
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this.startInNew = startInNew;
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};
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/**
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* 将HTML解析成单词列表
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* 例：<a> Hello World </a> ---> ["<a>"," ", "Hello", " ", "World", " ", "</a>"]
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* @param {String} html
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* @return {Array<String>}
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*/
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var convertHtml2Words = function (html) {
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return html.match(/<[^>]+>|[^<|>|\w]|\w+\b|\s+/mg);
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};
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/**
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* 差异对比构建类
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* @param {String} oldVersion 老文档
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* @param {String} newVersion 新文档
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*/
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var DiffBuilder = function (oldVersion, newVersion) {
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this.oldVersion = oldVersion;
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this.newVersion = newVersion;
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this.operation = null;
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this.wordIndices = {};
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this.oldWords = [];
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this.newWords = [];
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this.content = [];
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};
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DiffBuilder.prototype = {
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build: function () {
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var sd = new Date();
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this.splitInputs2Words();
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this.indexNewWords();
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this.operations = this.getOperations();
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this.performOperation();
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return this.content.join('');
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},
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performOperation: function () {
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var opt;
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for (var i = 0, len = this.operations.length; i < len; i++) {
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opt = this.operations[i];
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this.operation = opt;
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opt.action.call(this, opt);
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}
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},
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/**
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* 将传入的文本切割成词元
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*/
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splitInputs2Words: function () {
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if (this.oldVersion == "")
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this.oldWords = [];
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else
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this.oldWords = convertHtml2Words(this.oldVersion);
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if (this.newVersion == "")
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this.newWords = [];
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else
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this.newWords = convertHtml2Words(this.newVersion);
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},
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/**
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|
* 构建一个newWords队列对应的索引表
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|
* 例如：
|
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|
* this.newWords = ["<a>", " ", "Hello", " ", "World", " ", "</a>"];
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*
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|
|
* 构建成--->
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|
*
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|
|
* this.wordIndices = {
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|
* "<a>" : [0],
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|
* " " : [1, 3, 5]
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|
* "Hello" : [2],
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|
* "World" : [4],
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|
* "</a>" : [6]
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|
|
* };
|
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|
|
*/
|
|
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|
|
indexNewWords: function () {
|
|
|
|
|
|
var newWords = this.newWords;
|
|
|
|
|
|
var wordIndices = this.wordIndices;
|
|
|
|
|
|
var key, len = newWords.length;
|
|
|
|
|
|
var toString = Object.prototype.toString;
|
|
|
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|
|
for (var i = 0; i < len; i++) {
|
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|
key = newWords[i];
|
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|
|
|
|
if (toString.call(wordIndices[key]) !== '[object Array]') {
|
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|
|
wordIndices[key] = [];
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|
|
}
|
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|
|
wordIndices[key].push(i);
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|
}
|
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|
},
|
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|
|
/**
|
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|
|
|
|
* 将文档抽象为操作描述队列
|
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|
|
* 例如:[euqal, insert, equal]，一篇文档可以被抽象为由多个
|
|
|
|
|
|
* “操作命令与位置信息”组成的操作队列；
|
|
|
|
|
|
* @return {Array<Operation>}
|
|
|
|
|
|
*/
|
|
|
|
|
|
getOperations: function () {
|
|
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|
|
|
var optInOld = 0;
|
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|
|
|
|
var optInNew = 0;
|
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|
|
|
var operations = [];
|
|
|
|
|
|
var match, action;
|
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|
|
|
|
var matchStartsInOld;
|
|
|
|
|
|
var matchStartsInNew;
|
|
|
|
|
|
var matchs = this.matchingBlocks();
|
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|
|
|
|
matchs.push(new Match(this.oldWords.length, this.newWords.length, 0));
|
|
|
|
|
|
for (var i = 0, len = matchs.length; i < len; i++) {
|
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|
|
action = null;
|
|
|
|
|
|
match = matchs[i];
|
|
|
|
|
|
matchStartsInOld = (optInOld === match.startInOld);
|
|
|
|
|
|
matchStartsInNew = (optInNew === match.startInNew);
|
|
|
|
|
|
if (!matchStartsInOld && !matchStartsInNew) {
|
|
|
|
|
|
action = this.replace;
|
|
|
|
|
|
} else if (matchStartsInOld && !matchStartsInNew) {
|
|
|
|
|
|
action = this.insert;
|
|
|
|
|
|
} else if (!matchStartsInOld && matchStartsInNew) {
|
|
|
|
|
|
action = this.del;
|
|
|
|
|
|
}
|
|
|
|
|
|
if (action) {
|
|
|
|
|
|
operations.push(new Operation(action, optInOld, match.startInOld, optInNew, match.startInNew));
|
|
|
|
|
|
}
|
|
|
|
|
|
if (match.size) {
|
|
|
|
|
|
operations.push(new Operation(this.equal, match.startInOld, match.endInOld, match.startInNew, match.endInNew));
|
|
|
|
|
|
}
|
|
|
|
|
|
optInOld = match.endInOld;
|
|
|
|
|
|
optInNew = match.endInNew;
|
|
|
|
|
|
}
|
|
|
|
|
|
return operations;
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 获取一个用于描述新旧文档内全部相同内容的匹配描述列表
|
|
|
|
|
|
* @return {Array<Match>} 文档匹配描述列表
|
|
|
|
|
|
*/
|
|
|
|
|
|
matchingBlocks: function () {
|
|
|
|
|
|
var matchingBlocks = [];
|
|
|
|
|
|
this.findMatchingBlocks(0, this.oldWords.length, 0, this.newWords.length, matchingBlocks);
|
|
|
|
|
|
return matchingBlocks;
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 递归查找匹配项
|
|
|
|
|
|
* @param {Number} startInOld
|
|
|
|
|
|
* @param {Number} endInOld
|
|
|
|
|
|
* @param {Number} startInNew
|
|
|
|
|
|
* @param {Number} endInNew
|
|
|
|
|
|
* @param {Array<Match>} matchingBlocks
|
|
|
|
|
|
*/
|
|
|
|
|
|
findMatchingBlocks: function (startInOld, endInOld, startInNew, endInNew, matchingBlocks) {
|
|
|
|
|
|
var match = this.findMatch(startInOld, endInOld, startInNew, endInNew);
|
|
|
|
|
|
if (!match) {
|
|
|
|
|
|
return;
|
|
|
|
|
|
}
|
|
|
|
|
|
if (startInOld < match.startInOld && startInNew < match.startInNew) {
|
|
|
|
|
|
this.findMatchingBlocks(startInOld, match.startInOld, startInNew, match.startInNew, matchingBlocks);
|
|
|
|
|
|
}
|
|
|
|
|
|
matchingBlocks.push(match);
|
|
|
|
|
|
if (match.endInOld < endInOld && match.endInNew < endInNew) {
|
|
|
|
|
|
this.findMatchingBlocks(match.endInOld, endInOld, match.endInNew, endInNew, matchingBlocks);
|
|
|
|
|
|
}
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 从指定位置开始查询第一块匹配的文本块
|
|
|
|
|
|
* @param {Number} startInOld
|
|
|
|
|
|
* @param {Number} endInOld
|
|
|
|
|
|
* @param {Number} startInNew
|
|
|
|
|
|
* @param {Number} endInNew
|
|
|
|
|
|
*/
|
|
|
|
|
|
findMatch: function (startInOld, endInOld, startInNew, endInNew) {
|
|
|
|
|
|
var bestMatchInOld = startInOld;
|
|
|
|
|
|
var bestMatchInNew = startInNew;
|
|
|
|
|
|
var bestMatchSize = 0;
|
|
|
|
|
|
var matchLengthAt = {};
|
|
|
|
|
|
var newMatchLengthAt;
|
|
|
|
|
|
var newMatchLength, wordIndexList, matchIndex, len;
|
|
|
|
|
|
for (var idxOld = startInOld; idxOld < endInOld; idxOld++) {
|
|
|
|
|
|
newMatchLengthAt = {};
|
|
|
|
|
|
wordIndexList = this.wordIndices[this.oldWords[idxOld]];
|
|
|
|
|
|
len = wordIndexList ? wordIndexList.length : 0;
|
|
|
|
|
|
for (var i = 0; i < len; i++) {
|
|
|
|
|
|
matchIndex = wordIndexList[i];
|
|
|
|
|
|
if (matchIndex < startInNew) {
|
|
|
|
|
|
continue;
|
|
|
|
|
|
}
|
|
|
|
|
|
if (matchIndex >= endInNew) {
|
|
|
|
|
|
break;
|
|
|
|
|
|
}
|
|
|
|
|
|
newMatchLength = (matchLengthAt[matchIndex - 1] || 0) + 1;
|
|
|
|
|
|
newMatchLengthAt[matchIndex] = newMatchLength;
|
|
|
|
|
|
if (newMatchLength > bestMatchSize) {
|
|
|
|
|
|
bestMatchInOld = idxOld - newMatchLength + 1;
|
|
|
|
|
|
bestMatchInNew = matchIndex - newMatchLength + 1;
|
|
|
|
|
|
bestMatchSize = newMatchLength;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
matchLengthAt = newMatchLengthAt;
|
|
|
|
|
|
}
|
|
|
|
|
|
return bestMatchSize ? new Match(bestMatchInOld, bestMatchInNew, bestMatchSize) : null;
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
insert: function (opt, tagCls) {
|
|
|
|
|
|
//this.insertTag('ins', tagCls || 'diffins', this.newWords.slice(opt.startInNew, opt.endInNew));
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
del: function (opt, tagCls) {
|
|
|
|
|
|
this.insertTag('span', tagCls || 'diff', this.oldWords.slice(opt.startInOld, opt.endInOld));
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
equal: function (opt) {
|
|
|
|
|
|
this.content = this.content.concat(this.newWords.slice(opt.startInNew, opt.endInNew));
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
replace: function (opt) {
|
|
|
|
|
|
this.del(opt, 'diffmod');
|
|
|
|
|
|
this.insert(opt, 'diffmod');
|
|
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 添加标签
|
|
|
|
|
|
* @param {String} tagName
|
|
|
|
|
|
* @param {String} cssCls
|
|
|
|
|
|
* @param {String} words
|
|
|
|
|
|
*/
|
|
|
|
|
|
insertTag: function (tagName, cssCls, words) {
|
|
|
|
|
|
var nonTags;
|
|
|
|
|
|
var that = this;
|
|
|
|
|
|
while (words.length) {
|
|
|
|
|
|
//获取words内“连续”的非标签字符
|
|
|
|
|
|
nonTags = this.extractConsecutiveWords(words, true);
|
|
|
|
|
|
if (nonTags.length) {
|
|
|
|
|
|
this.content.push(
|
|
|
|
|
|
this.warpText(nonTags.join(''), tagName, cssCls));
|
|
|
|
|
|
}
|
|
|
|
|
|
if (words.length) {
|
|
|
|
|
|
//获取words内“连续”的标签字符
|
|
|
|
|
|
this.content = this.content.concat(
|
|
|
|
|
|
this.extractConsecutiveWords(words, false));
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 获取words内连续的“文本”或“标签”
|
|
|
|
|
|
* @param {Array<String>} words
|
|
|
|
|
|
* @param {Boolean} isTag
|
|
|
|
|
|
* @return {Array<String>}
|
|
|
|
|
|
*/
|
|
|
|
|
|
extractConsecutiveWords: function (words, isTag) {
|
|
|
|
|
|
var idxOfFirstTag = null;
|
|
|
|
|
|
for (var i = 0, len = words.length; i < len; i++) {
|
|
|
|
|
|
//注：是取判定条件的前一位
|
|
|
|
|
|
if (this.isTag(words[i]) == isTag) {
|
|
|
|
|
|
idxOfFirstTag = i;
|
|
|
|
|
|
break;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
return words.splice(0, idxOfFirstTag !== null ? idxOfFirstTag : words.length);
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
warpText: function (text, tagName, cssCls) {
|
|
|
|
|
|
return '<' + tagName + ' class="' + cssCls + '">' + text + '</' + tagName + '>';
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
isOpeningTag: function (item) {
|
|
|
|
|
|
return /^\s*<[^>]+>\s*$/ig.test(item);
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
isClosingTag: function (item) {
|
|
|
|
|
|
return /^\s*<\/[^>]+>\s*$/ig.test(item);
|
|
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
isTag: function (item) {
|
|
|
|
|
|
return this.isOpeningTag(item) ? 1 : this.isClosingTag(item) ? 2 : 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
root.getHTMLDiff = function (oldVersion, newVersion) {
|
|
|
|
|
|
return new DiffBuilder(oldVersion, newVersion).build();
|
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
* 针对高级浏览器开启webWorker支持
|
|
|
|
|
|
*/
|
|
|
|
|
|
if (typeof postMessage === "function") {
|
|
|
|
|
|
onmessage = function (evt) {
|
|
|
|
|
|
var data = evt.data;
|
|
|
|
|
|
var diff = getHTMLDiff(data.oldVersion, data.newVersion);
|
|
|
|
|
|
postMessage(diff);
|
|
|
|
|
|
};
|
|
|
|
|
|
}
|
|
|
|
|
|
})();
|
