LanguageServer::Protocol

A Language Server Protocol SDK for Ruby.

Add this line to your application's Gemfile:

gem 'language_server-protocol'

And then execute:

$ bundle

Or install it yourself as:

$ gem install language_server-protocol

Currently, this gem supports only stdio as transport layer out of box.

require "language_server-protocol"

LSP = LanguageServer::Protocol
writer = LSP::Transport::Stdio::Writer.new
reader = LSP::Transport::Stdio::Reader.new

subscribers = {
  initialize: -> {
    LSP::Interface::InitializeResult.new(
      capabilities: LSP::Interface::ServerCapabilities.new(
        text_document_sync: LSP::Interface::TextDocumentSyncOptions.new(
          change: LSP::Constant::TextDocumentSyncKind::FULL
        ),
        completion_provider: LSP::Interface::CompletionOptions.new(
          resolve_provider: true,
          trigger_characters: %w(.)
        ),
        definition_provider: true
      )
    )
  }
}

reader.read do |request|
  result = subscribers[request[:method].to_sym].call
  writer.write(id: request[:id], result: result)
  exit
end

You can use any IO object as transport layer:

io = StringIO.new
writer = LSP::Transport::Io::Writer.new(io)
reader = LSP::Transport::Io::Reader.new(io)

language_server-protocol gem does NOT use semantic versioning. This gem versions are structured as x.y.z.t. x.y.z indicates the Language server protocol version and t is a monotonically increasing number.

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/mtsmfm/language_server-protocol-ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the LanguageServer::Protocol project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.