Create VS Code file path service

Author: davidwengier

src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Services/VSCodeFilePathService.cs

@@ -0,0 +1,43 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System;
+using System.Composition;
+using Microsoft.CodeAnalysis.ExternalAccess.Razor;
+using Microsoft.CodeAnalysis.Razor.Workspaces;
+
+namespace Microsoft.CodeAnalysis.Remote.Razor;
+
+[Export(typeof(IFilePathService)), Shared]
+[method: ImportingConstructor]
+internal sealed class VSCodeFilePathService(LanguageServerFeatureOptions options) : AbstractFilePathService(options)
+{
+    private readonly LanguageServerFeatureOptions _options = options;
+
+    public override Uri GetRazorDocumentUri(Uri virtualDocumentUri)
+    {
+        if (_options.UseRazorCohostServer && IsVirtualCSharpFile(virtualDocumentUri))
+        {
+            throw new InvalidOperationException("Can not get a Razor document from a generated document Uri in cohosting");
+        }
+
+        if (virtualDocumentUri.Scheme == "razor-html")
+        {
+            var builder = new UriBuilder(virtualDocumentUri);
+            builder.Scheme = "file";
+            return base.GetRazorDocumentUri(builder.Uri);
+        }
+
+        return base.GetRazorDocumentUri(virtualDocumentUri);
+    }
+
+    public override bool IsVirtualCSharpFile(Uri uri)
+    {
+        if (_options.UseRazorCohostServer)
+        {
+            return RazorUri.IsGeneratedDocumentUri(uri);
+        }
+
+        return base.IsVirtualCSharpFile(uri);
+    }
+}