DEV Community

Cover image for Get Diff and Patch Html
Antoine
Antoine

Posted on

Get Diff and Patch Html

#dotnet

Photo by Markus Spiske on Diff.Match.Patch based on Google library.

Diff

Diff are made of:

  • text (part of the text related)
  • operation to be applied (delete / insert / equal)

It's easy to get diff:

    string a = "<SPAN TITLE=\"i=0\">a&para;<BR></SPAN><DEL STYLE=\"background:#FFE6E6;\" TITLE=\"i=2\">&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE=\"background:#E6FFE6;\" TITLE=\"i=2\">c&amp;d</INS>";
    string b = "<SPAN TITLE=\"i=0\">testa&para;<BR></SPAN><DEL STYLE=\":#FFE6E6;\" TITLE=\"i=2\">&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE=\"background:#E6FFE6;\" TITLE=\"i=2\">c&amp;d</INS>";

var diffs = DiffMatchPatchModule.Default.DiffMain(a, b);
Enter fullscreen mode Exit fullscreen mode

Please note that diffs will contains a lot of Equal diff !
Result: Result

Patch

It's simple too to get patch from multiple texts!

    string a = "<SPAN TITLE=\"i=0\">a&para;<BR></SPAN><DEL STYLE=\"background:#FFE6E6;\" TITLE=\"i=2\">&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE=\"background:#E6FFE6;\" TITLE=\"i=2\">c&amp;d</INS>";
    string b = "<SPAN TITLE=\"i=0\">testa&para;<BR></SPAN><DEL STYLE=\":#FFE6E6;\" TITLE=\"i=2\">&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE=\"background:#E6FFE6;\" TITLE=\"i=2\">c&amp;d</INS>";
    string c = "<SPAN TITLE=\"i=0\">a&para;<BR></SPAN><DEL STYLE=\"background:#FFE6E6;\" TITLE=\"i=2\">mon tittre en Or&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE=\"background:#E6FFE6;\" TITLE=\"i=2\">c&amp;d</INS>";

    var firstPatch = DiffMatchPatchModule.Default.PatchMake(a, b);
    var secondPatch = DiffMatchPatchModule.Default.PatchMake(a, c);
    DiffMatchPatchModule.Default.PatchApply(secondPatch, DiffMatchPatchModule.Default.PatchApply(firstPatch, a)[0].ToString());
Enter fullscreen mode Exit fullscreen mode

Ouptut:

<SPAN TITLE="i=0">testa&para;<BR></SPAN><DEL STYLE=":#FFE6E6;" TITLE="i=2">mon tittre en Or&lt;B&gt;b&lt;/B&gt;</DEL><INS STYLE="background:#E6FFE6;" TITLE="i=2">c&amp;d</INS>
Enter fullscreen mode Exit fullscreen mode

Please note that DiffMatchPatchModule.Default.PatchApply(firstPatch, a) outputs object[] !

Hope that helps !

Top comments (0)

Read next

ohalay profile image

Dotnet AsyncApi specification for Avro Kafka channel

ohalay -

elanatframework profile image

In WebForms Core Technology, All the Disadvantages of Microsoft's Former WebForms have been Fixed

elanatframework -

prahladyeri profile image

Migrate Your .NET 7 Applications to .NET 8: A Complete Guide

Prahlad Yeri -

moh_moh701 profile image

Mastering C# Fundamentals: Comparing Strings

mohamed Tayel -