Class: Standard::LSP::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/standard/lsp/server.rb

Constant Summary collapse

Proto = 
LanguageServer::Protocol
SEV = 
Proto::Constant::DiagnosticSeverity

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(standardizer) ⇒ Server

Returns a new instance of Server.



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# File 'lib/standard/lsp/server.rb', line 16

def initialize(standardizer)
  self.standardizer = standardizer
  self.writer = Proto::Transport::Io::Writer.new($stdout)
  self.reader = Proto::Transport::Io::Reader.new($stdin)
  self.logger = $stderr
  self.text_cache = {}

  self.subscribers = {
    "initialize" => ->(request) {
      init_result = Proto::Interface::InitializeResult.new(
        capabilities: Proto::Interface::ServerCapabilities.new(
          document_formatting_provider: true,
          diagnostic_provider: true,
          text_document_sync: Proto::Constant::TextDocumentSyncKind::FULL
        )
      )
      writer.write(id: request[:id], result: init_result)
    },

    "initialized" => ->(request) { logger.puts "standard v#{Standard::VERSION} initialized, pid #{Process.pid}" },

    "shutdown" => ->(request) {
      logger.puts "asked to shutdown, exiting..."
      exit
    },

    "textDocument/didChange" => ->(request) {
      params = request[:params]
      result = diagnostic(params[:textDocument][:uri], params[:contentChanges][0][:text])
      writer.write(result)
    },

    "textDocument/didOpen" => ->(request) {
      td = request[:params][:textDocument]
      result = diagnostic(td[:uri], td[:text])
      writer.write(result)
    },

    "textDocument/didClose" => ->(request) {
      text_cache.delete(request.dig(:params, :textDocument, :uri))
    },

    "textDocument/formatting" => ->(request) {
      uri = request[:params][:textDocument][:uri]
      writer.write({id: request[:id], result: format_file(uri)})
    },

    "textDocument/didSave" => ->(request) {}
  }
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/standard/lsp/server.rb', line 14

def logger
  @logger
end

#reader ⇒ Object

Returns the value of attribute reader.



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# File 'lib/standard/lsp/server.rb', line 14

def reader
  @reader
end

#standardizer ⇒ Object

Returns the value of attribute standardizer.



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# File 'lib/standard/lsp/server.rb', line 14

def standardizer
  @standardizer
end

#subscribers ⇒ Object

Returns the value of attribute subscribers.



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# File 'lib/standard/lsp/server.rb', line 14

def subscribers
  @subscribers
end

#text_cache ⇒ Object

Returns the value of attribute text_cache.



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# File 'lib/standard/lsp/server.rb', line 14

def text_cache
  @text_cache
end

#writer ⇒ Object

Returns the value of attribute writer.



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# File 'lib/standard/lsp/server.rb', line 14

def writer
  @writer
end

Class Method Details

.start(standardizer) ⇒ Object 



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# File 'lib/standard/lsp/server.rb', line 10

def self.start(standardizer)
  new(standardizer).start
end

Instance Method Details

#diagnostic(file_uri, text) ⇒ Object 



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# File 'lib/standard/lsp/server.rb', line 98

def diagnostic(file_uri, text)
  text_cache[file_uri] = text
  offenses = standardizer.offenses(text)

  lsp_diagnostics = offenses.map { |o|
    code = o[:cop_name]

    msg = o[:message].delete_prefix(code)
    loc = o[:location]

    severity = case o[:severity]
    when "error", "fatal"
      SEV::ERROR
    when "warning"
      SEV::WARNING
    when "convention"
      SEV::INFORMATION
    when "refactor", "info"
      SEV::HINT
    else # the above cases fully cover what RuboCop sends at this time
      logger.puts "unknown severity: #{severity.inspect}"
      SEV::HINT
    end

    {
      code: code,
      message: msg,
      range: {
        start: {character: loc[:start_column] - 1, line: loc[:start_line] - 1},
        end: {character: loc[:last_column] - 1, line: loc[:last_line] - 1}
      },
      severity: severity,
      source: "standard"
    }
  }

  {
    method: "textDocument/publishDiagnostics",
    params: {
      diagnostics: lsp_diagnostics,
      uri: file_uri
    }
  }
end

#format_file(file_uri) ⇒ Object 



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# File 'lib/standard/lsp/server.rb', line 81

def format_file(file_uri)
  text = text_cache[file_uri]
  new_text = standardizer.format(text)

  if new_text == text
    []
  else
    [{
      newText: new_text,
      range: {
        start: {line: 0, character: 0},
        end: {line: text.count("\n") + 1, character: 0}
      }
    }]
  end
end

#start ⇒ Object 



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# File 'lib/standard/lsp/server.rb', line 67

def start
  reader.read do |request|
    method = request[:method]
    if (subscriber = subscribers[method])
      subscriber.call(request)
    else
      logger.puts "unknown method: #{method}"
    end
  rescue => e
    logger.puts "error #{e.class} #{e.message[0..100]}"
    logger.puts e.backtrace.inspect
  end
end