New LSP language service supporting Swift and C-family languages for any editor and platform

[akyrtzi (Argyrios Kyrtzidis)]

@yeswolf

1. Are there any plans to have the index/cache format description, so it could be used also outside the LSP server if needed?

We will provide a library usable via a C and Swift API that provides access to the index database.

@yeswolf

2. Do you plan to make extension points allowing to extend the cache/index/LSP functionality without building a custom toolchain (applies to both OSS toolchains and the one bundled in the Xcode)?
3. Are there any plans to combine the LSP direction with further evolution of Xcode Source Editor extensions and/or making another plugin system allowing to:

a. Add custom UI components in Xcode
b. Use editor API and extend it (not only actions, but also highlighting, completion, etc)

This is beyond what we are committed in delivering as part of this announcement. I'd recommend to make your enhancement requests known to the Xcode team via https://bugreport.apple.com, if you haven't already.