一个google多语言diff源码和测试类，支持的语言有：Java, JavaScript, Dart, C++, C#, Objective C, Lua and Python。这货很方便，对比之后还可以生成html的diif代码片段。不是什么新玩意，项目最后更新时间是2012年。

项目地址：https://code.google.com/p/google-diff-match-patch/

源码和测试类：

http://pan.baidu.com/s/1ntG6kat

google-diff-match-patch：用于对文本进行比对，匹配和补缀。它提供了强大的算法来进行同步纯文本所需的操作。

1. Diff:

   • Compare two blocks of plain text and efficiently return a list of differences.
   • Diff Demo

2. Match:

   • Given a search string, find its best fuzzy match in a block of plain text. Weighted for both accuracy and location.
   • Match Demo

3. Patch:

   • Apply a list of patches onto plain text. Use best-effort to apply patch even when the underlying text doesn't match.
   • Patch Demo

当前支持Java, JavaScript, Dart, C++, C#, Objective C, Lua 和Python等编程语言。所提供的每种语言版本都具有相同的API和相同的API。