比较文本文件的两个版本，并查找使用Ruby进行的添加/删除? [英] Compare two versions of a text file and find additions/removals with Ruby?

问题描述

我正在使用Ruby跟踪网页中的更改.删除所有html标记和空白行后，我得到了一个行数组，假设可能存在重复，需要对其进行添加/删除检查.如果已经做过，您能推荐一颗好宝石吗?

I am tracking changes in a web-page using Ruby. After I removed all html tags and blank lines, I get an array of lines which needs to be checked for additions/removals assuming that there may be repetitions. Could you recommend a good gem if it has been done already?

我可以使阵列线唯一，然后可以避免该问题.但是，如果我还需要跟踪重复行相对于它们在文本中的位置，该怎么办?

I could make the array lines unique and then the problem is avoided. But what if I need to track the repeated lines as well with respect to their position in the text?

推荐答案

听起来像教科书中要使用Diff算法的情况.

Sounds like a textbook case of where you'd want to use the Diff algorithm.

有一个'diff'宝石，尽管公平地说，我从未使用过它: http://ruby​​gems. org/gems/diff

There's a 'diff' gem, although to be fair I've never used it: http://rubygems.org/gems/diff

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