Language.LSP.Server

Running

runServer

Arguments

:: ServerDefinition config

function to be called once initialize has been received from the client. Further message processing will start only after this returns.

-> IO Int

Convenience function for 'runServerWithHandles stdin stdout'.

runServerWith

Arguments

:: IO ByteString

Client input.

-> (ByteString -> IO ())

Function to provide output to.

-> ServerDefinition config

-> IO Int

Starts listening and sending requests and responses using the specified I/O.

runServerWithHandles

Arguments

:: Handle

Handle to read client input from.

-> Handle

Handle to write output to.

-> ServerDefinition config

-> IO Int

Starts a language server over the specified handles. This function will return once the exit notification is received.

data VFSData

Constructors

VFSData

Fields

• vfsData :: !VFS
• reverseMap :: !(Map FilePath FilePath)

data ServerDefinition config

Contains all the callbacks to use for initialized the language server. it is parameterized over a config type variable representing the type for the specific configuration data the language server needs to use.

Constructors

forall m a. ServerDefinition

Fields

• defaultConfig :: config

  The default value we initialize the config variable to.

• onConfigurationChange :: config -> Value -> Either Text config

  onConfigurationChange oldConfig newConfig is called whenever the clients sends a message with a changed client configuration. This callback should return either the parsed configuration data or an error indicating what went wrong. The parsed configuration object will be stored internally and can be accessed via config. It is also called on the initializationOptions field of the InitializeParams

• doInitialize :: LanguageContextEnv config -> Message Initialize -> IO (Either ResponseError a)

  Called *after* receiving the initialize request and *before* returning the response. This callback will be invoked to offer the language server implementation the chance to create any processes or start new threads that may be necesary for the server lifecycle. It can also return an error in the initialization if necessary.

• staticHandlers :: Handlers m

  Handlers for any methods you want to statically support. The handlers here cannot be unregistered during the server's lifetime and will be regsitered statically in the initialize request.

• interpretHandler :: a -> m <~> IO

  How to run the handlers in your own monad of choice, m. It is passed the result of doInitialize, so typically you will want to thread along the LanguageContextEnv as well as any other state you need to run your monad. m should most likely be built on top of LspT.

   ServerDefinition { ...
   , doInitialize = env _req -> pure $ Right env
   , interpretHandler = env -> Iso 
      (runLspT env) -- how to convert from IO ~> m
      liftIO        -- how to convert from m ~> IO
   }
  

• options :: Options

  Configurable options for the server's capabilities.

Handlers

data Handlers m

A mapping from methods to the static Handlers that should be used to handle responses when they come in from the client. To build up a Handlers, you should mconcat a list of notificationHandler and requestHandlers:

mconcat [
  notificationHandler SInitialized $ notif -> pure ()
, requestHandler STextDocumentHover $ req responder -> pure ()
]

Constructors

Handlers

Fields

• reqHandlers :: !(DMap SMethod (ClientMessageHandler m Request))
• notHandlers :: !(DMap SMethod (ClientMessageHandler m Notification))

Instances

Semigroup (Handlers config)

Defined in Language.LSP.Server.Core

Methods

(<>) :: Handlers config -> Handlers config -> Handlers config

sconcat :: NonEmpty (Handlers config) -> Handlers config

stimes :: Integral b => b -> Handlers config -> Handlers config

Monoid (Handlers config)

Defined in Language.LSP.Server.Core

Methods

mempty :: Handlers config

mappend :: Handlers config -> Handlers config -> Handlers config

mconcat :: [Handlers config] -> Handlers config

type family Handler (f :: Type -> Type) (m :: Method from t) = (result :: Type) | result -> f t m where ...

The type of a handler that handles requests and notifications coming in from the server or client

Equations

Handler f (m :: Method _from Request) = RequestMessage m -> (Either ResponseError (ResponseResult m) -> f ()) -> f ()

Handler f (m :: Method _from Notification) = NotificationMessage m -> f ()

transmuteHandlers :: (m <~> n) -> Handlers m -> Handlers n

mapHandlers :: (forall (a :: Method FromClient Request). Handler m a -> Handler n a) -> (forall (a :: Method FromClient Notification). Handler m a -> Handler n a) -> Handlers m -> Handlers n

notificationHandler :: forall (m :: Method FromClient Notification) f. SMethod m -> Handler f m -> Handlers f

requestHandler :: forall (m :: Method FromClient Request) f. SMethod m -> Handler f m -> Handlers f

newtype ClientMessageHandler f (t :: MethodType) (m :: Method FromClient t)

Wrapper to restrict Handlers to FromClient Methods

Constructors

ClientMessageHandler (Handler f m)

data Options

Language Server Protocol options that the server may configure. If you set handlers for some requests, you may need to set some of these options.

Constructors

Options

Fields

• textDocumentSync :: Maybe TextDocumentSyncOptions
• completionTriggerCharacters :: Maybe [Char]

  The characters that trigger completion automatically.

• completionAllCommitCharacters :: Maybe [Char]

  The list of all possible characters that commit a completion. This field can be used if clients don't support individual commmit characters per completion item. See $sel:_commitCharactersSupport:CompletionItemClientCapabilities.

• signatureHelpTriggerCharacters :: Maybe [Char]

  The characters that trigger signature help automatically.

• signatureHelpRetriggerCharacters :: Maybe [Char]

  List of characters that re-trigger signature help. These trigger characters are only active when signature help is already showing. All trigger characters are also counted as re-trigger characters.

• codeActionKinds :: Maybe [CodeActionKind]

  CodeActionKinds that this server may return. The list of kinds may be generic, such as Refactor, or the server may list out every specific kind they provide.

• documentOnTypeFormattingTriggerCharacters :: Maybe (NonEmpty Char)

  The list of characters that triggers on type formatting. If you set documentOnTypeFormattingHandler, you **must** set this. The first character is mandatory, so a NonEmpty should be passed.

• executeCommandCommands :: Maybe [Text]

  The commands to be executed on the server. If you set executeCommandHandler, you **must** set this.

• serverInfo :: Maybe ServerInfo

  Information about the server that can be advertised to the client.

Instances

Default Options

Defined in Language.LSP.Server.Core

Methods

def :: Options

defaultOptions :: Options

LspT and LspM

newtype LspT config m a

Constructors

LspT

Fields

• unLspT :: ReaderT (LanguageContextEnv config) m a

Instances

MonadUnliftIO m => MonadLsp config (LspT config m)

Defined in Language.LSP.Server.Core

Methods

getLspEnv :: LspT config m (LanguageContextEnv config)

MonadTrans (LspT config)

Defined in Language.LSP.Server.Core

Methods

lift :: Monad m => m a -> LspT config m a

Monad m => Monad (LspT config m)

Defined in Language.LSP.Server.Core

Methods

(>>=) :: LspT config m a -> (a -> LspT config m b) -> LspT config m b

(>>) :: LspT config m a -> LspT config m b -> LspT config m b

return :: a -> LspT config m a

Functor m => Functor (LspT config m)

Defined in Language.LSP.Server.Core

Methods

fmap :: (a -> b) -> LspT config m a -> LspT config m b

(<$) :: a -> LspT config m b -> LspT config m a

MonadFix m => MonadFix (LspT config m)

Defined in Language.LSP.Server.Core

Methods

mfix :: (a -> LspT config m a) -> LspT config m a

Applicative m => Applicative (LspT config m)

Defined in Language.LSP.Server.Core

Methods

pure :: a -> LspT config m a

(<*>) :: LspT config m (a -> b) -> LspT config m a -> LspT config m b

liftA2 :: (a -> b -> c) -> LspT config m a -> LspT config m b -> LspT config m c

(*>) :: LspT config m a -> LspT config m b -> LspT config m b

(<*) :: LspT config m a -> LspT config m b -> LspT config m a

MonadIO m => MonadIO (LspT config m)

Defined in Language.LSP.Server.Core

Methods

liftIO :: IO a -> LspT config m a

MonadUnliftIO m => MonadUnliftIO (LspT config m)

Defined in Language.LSP.Server.Core

Methods

withRunInIO :: ((forall a. LspT config m a -> IO a) -> IO b) -> LspT config m b

type LspM config = LspT config IO

class MonadUnliftIO m => MonadLsp config m | m -> config where

Methods

getLspEnv :: m (LanguageContextEnv config)

Instances

MonadLsp c m => MonadLsp c (IdentityT m)

Defined in Language.LSP.Server.Core

Methods

getLspEnv :: IdentityT m (LanguageContextEnv c)

MonadLsp c m => MonadLsp c (ReaderT r m)

Defined in Language.LSP.Server.Core

Methods

getLspEnv :: ReaderT r m (LanguageContextEnv c)

MonadUnliftIO m => MonadLsp config (LspT config m)

Defined in Language.LSP.Server.Core

Methods

getLspEnv :: LspT config m (LanguageContextEnv config)

runLspT :: LanguageContextEnv config -> LspT config m a -> m a

data LanguageContextEnv config

Constructors

LanguageContextEnv

Fields

• resHandlers :: !(Handlers IO)
• resParseConfig :: !(config -> Value -> Either Text config)
• resSendMessage :: !(FromServerMessage -> IO ())
• resState :: !(LanguageContextState config)
• resClientCapabilities :: !ClientCapabilities
• resRootPath :: !(Maybe FilePath)

data m <~> n

How to convert two isomorphic data structures between each other.

Constructors

Iso

Fields

• forward :: forall a. m a -> n a
• backward :: forall a. n a -> m a

getClientCapabilities :: MonadLsp config m => m ClientCapabilities

getConfig :: MonadLsp config m => m config

The current configuration from the client as set via the initialize and workspace/didChangeConfiguration requests.

getRootPath :: MonadLsp config m => m (Maybe FilePath)

getWorkspaceFolders :: MonadLsp config m => m (Maybe [WorkspaceFolder])

The current workspace folders, if the client supports workspace folders.

sendRequest :: forall (m :: Method FromServer Request) f config. MonadLsp config f => SServerMethod m -> MessageParams m -> (Either ResponseError (ResponseResult m) -> f ()) -> f (LspId m)

sendNotification :: forall (m :: Method FromServer Notification) f config. MonadLsp config f => SServerMethod m -> MessageParams m -> f ()

VFS

getVirtualFile :: MonadLsp config m => NormalizedUri -> m (Maybe VirtualFile)

Return the VirtualFile associated with a given NormalizedUri, if there is one.

getVirtualFiles :: MonadLsp config m => m VFS

persistVirtualFile :: MonadLsp config m => NormalizedUri -> m (Maybe FilePath)

Dump the current text for a given VFS file to a temporary file, and return the path to the file.

getVersionedTextDoc :: MonadLsp config m => TextDocumentIdentifier -> m VersionedTextDocumentIdentifier

Given a text document identifier, annotate it with the latest version.

reverseFileMap :: MonadLsp config m => m (FilePath -> FilePath)

If the contents of a VFS has been dumped to a temporary file, map the temporary file name back to the original one.

Diagnostics

publishDiagnostics :: MonadLsp config m => Int -> NormalizedUri -> TextDocumentVersion -> DiagnosticsBySource -> m ()

Aggregate all diagnostics pertaining to a particular version of a document, by source, and sends a textDocument/publishDiagnostics notification with the total (limited by the first parameter) whenever it is updated.

flushDiagnosticsBySource

Arguments

:: MonadLsp config m

=> Int

Max number of diagnostics to send

-> Maybe DiagnosticSource

-> m ()

Remove all diagnostics from a particular source, and send the updates to the client.

Progress

withProgress :: MonadLsp c m => Text -> ProgressCancellable -> ((ProgressAmount -> m ()) -> m a) -> m a

Wrapper for reporting progress to the client during a long running task. withProgress title cancellable f starts a new progress reporting session, and finishes it once f is completed. f is provided with an update function that allows it to report on the progress during the session. If cancellable is Cancellable, f will be thrown a ProgressCancelledException if the user cancels the action in progress.

withIndefiniteProgress :: MonadLsp c m => Text -> ProgressCancellable -> m a -> m a

Same as withProgress, but for processes that do not report the precentage complete.

Since: 0.10.0.0

data ProgressAmount

A package indicating the perecentage of progress complete and a an optional message to go with it during a withProgress

Since: 0.10.0.0

Constructors

ProgressAmount (Maybe Double) (Maybe Text)

data ProgressCancellable

Whether or not the user should be able to cancel a withProgress/withIndefiniteProgress session

Since: 0.11.0.0

Constructors

Cancellable

NotCancellable

data ProgressCancelledException

Thrown if the user cancels a Cancellable withProgresswithIndefiniteProgress session

Since: 0.11.0.0

Instances

Show ProgressCancelledException

Defined in Language.LSP.Server.Core

Methods

showsPrec :: Int -> ProgressCancelledException -> ShowS

show :: ProgressCancelledException -> String

showList :: [ProgressCancelledException] -> ShowS

Exception ProgressCancelledException

Defined in Language.LSP.Server.Core

Methods

toException :: ProgressCancelledException -> SomeException

fromException :: SomeException -> Maybe ProgressCancelledException

displayException :: ProgressCancelledException -> String

Dynamic registration

registerCapability :: forall f t (m :: Method FromClient t) config. MonadLsp config f => SClientMethod m -> RegistrationOptions m -> Handler f m -> f (Maybe (RegistrationToken m))

Sends a client/registerCapability request and dynamically registers a Method with a Handler. Returns Nothing if the client does not support dynamic registration for the specified method, otherwise a RegistrationToken which can be used to unregister it later.

unregisterCapability :: MonadLsp config f => RegistrationToken m -> f ()

Sends a client/unregisterCapability request and removes the handler for that associated registration.

data RegistrationToken (m :: Method FromClient t)

setupLogger :: Maybe FilePath -> [String] -> Priority -> IO ()

reverseSortEdit :: WorkspaceEdit -> WorkspaceEdit

The changes in a workspace edit should be applied from the end of the file toward the start. Sort them into this order.