index.adoc

Eclipse Language Services

Start point for documentation related to eclipse language services

The idea is to have a proof of concept of Language Services on Eclipse by:

• implementing a subclass of SSE Structured Editor that sends data to a language service

As protocol we refer to the vscode languageserver protocol, implemented under MIT license by the team of E.Gamma, (MicroSoft) .

Server Side

Protocol: https://github.com/Microsoft/vscode-languageserver-protocol

The easiest way to have a language server running is to install VSCode: http://code.visualstudio.com/

1. How to run the JavaScript language server

2. Start VSCode

3. Clone a git repo with JS code: https://github.com/josdejong/mathjs

4. Open the cloned folder in VSCode

Eclipse IDE Side

We choose to start implementing a JavaScript Editor as VSCode already provides a Language Server Service for a JavaScript editor. You can extend this by adding any other editor, as example XML, Java, Xtext, PHP, HTML, XSLT, SASS, etc.

• We created a plugin org.eclipse.lsp4e, which implements an extension to org.eclipse.wst.jsdt.ui.javaCompletionProposalComputer.

• The LanguageCompletionProposalComputer#computeCompletionProposals(..) is the method that actually provides content assist.

• To run, you need to setup for JSDT, explained here: https://www.youtube.com/watch?v=gOz1hk-ohMA

Important Notes and References

• Sven put an interesting comment to ensime-server see: https://github.com/ensime/ensime-server/issues/1498

• Initial prototype of language server protocol extension for Che using the TypeFox API: https://github.com/eclipse/che/pull/1323/commits/e250864c89228875723649268a72a87d91057033