[lsp4e-dev] LSP diagnostics don't seem to be supported when integrating

[Balog Tamás <picimako@xxxxxxxxxxxxxx>]

Dear everyone,

I'm working on an Eclipse plugin for our language server (at https://github.com/codiga/vscode-plugin/tree/main/server/src), and I so far managed to put together an implementation based on these articles:

• https://www.eclipse.org/community/eclipse_newsletter/2017/may/article3.php
• https://www.vogella.com/tutorials/EclipseLanguageServer/article.html

Our language server is implemented in TypeScript with the vscode-language-server-node package, so I'm executing a Node process from the Eclipse plugin. I see that the Node process starts properly, but when I inspect the client capabilities in the connection's InitializeParams, I see that both the textDocument/publishDiagnostics and the pull diagnostic related capabilities are false, meaning they are not supported by the client application (Eclipse).

I find this odd considering that there are other language server integrations for Eclipse that work with diagnostics. I'm completely new to Eclipse plugin development, so, I don't know if I'm missing something, or misconfigured something.

The client application name and version I get from InitializeParams is Eclipse IDE/0.15.0.202211292024.

I included my implementation below, and I appreaciate any help.

ProcessStreamConnectionProvider implementation:

package io.codiga.rosiels;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import java.util.List;

import org.eclipse.core.runtime.FileLocator;

import org.eclipse.lsp4e.server.ProcessStreamConnectionProvider;

public class RosieStreamConnectionProvider extends ProcessStreamConnectionProvider {

  public RosieStreamConnectionProvider() {

    try {

      String nodeJsLocation = System.getenv("NODE_PATH");

      URL serverJsUrl = getClass().getResource("/language-server/out/server.js");

      String serverJsPath = FileLocator.toFileURL(serverJsUrl).getPath();

      String serverjsAbsolutePath = new File(serverJsPath).getAbsolutePath();

      var commands = List.of(nodeJsLocation + "node", serverjsAbsolutePath, "--stdio");

      setCommands(commands);

      setWorkingDirectory(System.getProperty("user.dir"));

    } catch (IOException e) {

    }

  }

}

plugin.xml:

<?xml version="1.0" encoding="UTF-8"?>

<?eclipse version="3.4"?>

<plugin>

   <extension

         point="org.eclipse.core.contenttype.contentTypes">

         <content-type

          base-type="org.eclipse.core.runtime.text"

          file-extensions="js,jsx,ts,tsx,py,ipynb"

          id="rosie.language.server"

          name="Rosie Language Server"

          priority="normal">

      </content-type>

   </extension>

   <extension

         point="org.eclipse.ui.editors">

         <editorContentTypeBinding

          contentTypeId="rosie.language.server"

          editorId="org.eclipse.ui.genericeditor.GenericEditor">

         </editorContentTypeBinding>

   </extension>

   <extension

         point="org.eclipse.lsp4e.languageServer">

      <server

            class="io.codiga.rosiels.RosieStreamConnectionProvider"

            id="rosie.language.server"

            label="rosie.language.server">

      </server>

      <contentTypeMapping

            contentType="rosie.language.server"

            id="rosie.language.server">

      </contentTypeMapping>

   </extension>

</plugin>

Cheers,

Tamás Balog