Extending Microsoft.AspNetCore.Razor.LanguageServer and it's client

[abbatepabloo]

Language Service Protocol Extension:

I have being playing a little bit with aspnetcore-tooling using Visual Studio 2019 LSP and I'm wondering if it's possible to extend the server's and client's functionality in order to enrich the user experience in a custom component.

Scenario:

• Imagine that you have developed a Blazor custom component that you will distribute to other programmers
• When those programmers insert your component's tag in a razor page, at server side, you want to use the current document's information (SyntaxTree, Symbols, etc) to produce some options that you will show to the programmer later.
• In VSCode/VS2019, while the programmer is between your component's tags, he/she can press a predetermined keys combination in order to be presented with a window showing the different options that you collected before.
• He/she can choose one or more values from the window.
• Whe is done the client will send these options back to the server whitch will use them to fill some HTML code and notify the changes to the client.
• The programmer will see the generated HTML codeblock inserted in his/her page.

In order to try to accomplish this goal I tried some things:

• I created a Visual Studio Extension Project (VSIX) and included the aspnetcore-tooling's assemblies that could help me to extend the existing server funcionality, maybe by inheriting from Microsoft.AspNetCore.Razor.LanguageServer.RazorLanguageServer. Then I realized that those assemblies are using internal classes and only allow the access vía InternalsVisibleTo attribute to a known group of assemblies. It didn't work.

• Different approach: I tried to create an analyzer and it's an accompanying code fix. I tried two approaches:

  1. I used Microsoft.WebTools.Languages.Html.Editor.SuggestedActions.HtmlSuggestedActionBase in order to collect view, buffer and text element. But I don't have Roslyn information of the current document.
  2. I used Microsoft.CodeAnalysis.CodeRefactorings.CodeRefactoringProvider in order to collect the current document context but, in this case, I don't have the HTML document information.

Because I'm far from being an expert in this matter may be I'm creating a dumb discussion. My apologies in advance.