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Antoine
Antoine

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

Hope that helps !

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