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POCode diff using Roslyn CTP API
 

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    <p>I'm trying to do some basic code diff with the Roslyn API, and I'm running into some unexpected problems. Essentially, I have two pieces of code that are the same, except one line has been added. This should just return the line of the changed text, but for some reason, it's telling me that everything has changed. I have also tried just editing one line instead of adding a line, but I get the same result. I would like to be able to apply this to two versions of a source file to identify differences between the two. Here's the code I'm currently using:</p> <pre><code> SyntaxTree tree = SyntaxTree.ParseCompilationUnit( @"using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace HelloWorld { class Program { static void Main(string[] args) { Console.WriteLine(""Hello, World!""); } } }"); var root = (CompilationUnitSyntax)tree.Root; var compilation = Compilation.Create("HelloWorld") .AddReferences( new AssemblyFileReference( typeof(object).Assembly.Location)) .AddSyntaxTrees(tree); var model = compilation.GetSemanticModel(tree); var nameInfo = model.GetSemanticInfo(root.Usings[0].Name); var systemSymbol = (NamespaceSymbol)nameInfo.Symbol; SyntaxTree tree2 = SyntaxTree.ParseCompilationUnit( @"using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace HelloWorld { class Program { static void Main(string[] args) { Console.WriteLine(""Hello, World!""); Console.WriteLine(""jjfjjf""); } } }"); var root2 = (CompilationUnitSyntax)tree2.Root; var compilation2 = Compilation.Create("HelloWorld") .AddReferences( new AssemblyFileReference( typeof(object).Assembly.Location)) .AddSyntaxTrees(tree2); var model2 = compilation2.GetSemanticModel(tree2); var nameInfo2 = model2.GetSemanticInfo(root2.Usings[0].Name); var systemSymbol2 = (NamespaceSymbol)nameInfo2.Symbol; foreach (TextSpan t in tree2.GetChangedSpans(tree)) { Console.WriteLine(tree2.Text.GetText(t)); } </code></pre> <p>And here's the output I'm getting:</p> <pre><code>System using System Collections Generic using System Linq using System Text namespace HelloWorld { class Program { static Main args { Console WriteLine "Hello, World!" Console.WriteLine("jjfjjf"); } } } Press any key to continue . . . </code></pre> <p>Interestingly, it seems to show each line as tokens for every line except for the added line, where it displays the line without breaking it up. Does anyone know how to isolate the actual changes?</p>
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    1. COAre you sure you aren't just looking for a simple [diff](http://en.wikipedia.org/wiki/Diff) tool?
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    2. COI was hoping to keep it within the Roslyn API because I'm using it to set up regression testing and I think it will be easier to keep the diff part in Roslyn's API. If this doesn't work though, I will probably end up using a tool like [this one](http://www.codeproject.com/KB/recipes/diffengine.aspx)
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    3. COAre you interested in other tools that compute tree differences?
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