Class: SyntaxTree::LanguageServer

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/language_server.rb,
lib/syntax_tree/language_server/inlay_hints.rb

Overview

Syntax Tree additionally ships with a language server conforming to the language server protocol. It can be invoked through the CLI by running:

stree lsp

Defined Under Namespace

Classes: InlayHints

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input: $stdin, output: $stdout) ⇒ LanguageServer

Returns a new instance of LanguageServer.



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# File 'lib/syntax_tree/language_server.rb', line 18

def initialize(input: $stdin, output: $stdout)
  @input = input.binmode
  @output = output.binmode
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/syntax_tree/language_server.rb', line 16

def input
  @input
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/syntax_tree/language_server.rb', line 16

def output
  @output
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/syntax_tree/language_server.rb', line 23

def run
  store =
    Hash.new do |hash, uri|
      hash[uri] = File.binread(CGI.unescape(URI.parse(uri).path))
    end

  while (headers = input.gets("\r\n\r\n"))
    source = input.read(headers[/Content-Length: (\d+)/i, 1].to_i)
    request = JSON.parse(source, symbolize_names: true)

    case request
    in { method: "initialize", id: }
      store.clear
      write(id: id, result: { capabilities: capabilities })
    in method: "initialized"
      # ignored
    in method: "shutdown"
      store.clear
      return
    in {
         method: "textDocument/didChange",
         params: { textDocument: { uri: }, contentChanges: [{ text: }, *] }
       }
      store[uri] = text
    in {
         method: "textDocument/didOpen",
         params: { textDocument: { uri:, text: } }
       }
      store[uri] = text
    in {
         method: "textDocument/didClose", params: { textDocument: { uri: } }
       }
      store.delete(uri)
    in {
         method: "textDocument/formatting",
         id:,
         params: { textDocument: { uri: } }
       }
      write(id: id, result: [format(store[uri])])
    in {
         method: "textDocument/inlayHints",
         id:,
         params: { textDocument: { uri: } }
       }
      write(id: id, result: inlay_hints(store[uri]))
    in {
         method: "syntaxTree/visualizing",
         id:,
         params: { textDocument: { uri: } }
       }
      write(id: id, result: PP.pp(SyntaxTree.parse(store[uri]), +""))
    in method: %r{\$/.+}
      # ignored
    else
      raise ArgumentError, "Unhandled: #{request}"
    end
  end
end