Protocol

class pygls.protocol.LanguageServerProtocol(server, converter)

A class that represents language server protocol.

It contains implementations for generic LSP features.

Parameters:
workspace

In memory workspace

Type:

Workspace

get_message_type(method)

Return LSP type definitions, as provided by lsprotocol

Parameters:

method (str) –

Return type:

Type[Any] | None

get_result_type(method)

Return the type definition of the result associated with the given method.

Parameters:

method (str) –

Return type:

Type[Any] | None

lsp_exit(*args)

Stops the server process.

Return type:

Generator[Any, Any, None]

lsp_initialize(params)

Method that initializes language server. It will compute and return server capabilities based on registered features.

Parameters:

params (types.InitializeParams) –

Return type:

Generator[Any, Any, types.InitializeResult]

lsp_initialized(*args)

Notification received when client and server are connected.

lsp_notebook_document__did_change(params)

Update a notebook’s contents

Parameters:

params (DidChangeNotebookDocumentParams) –

lsp_notebook_document__did_close(params)

Remove a notebook document from the workspace.

Parameters:

params (DidCloseNotebookDocumentParams) –

lsp_notebook_document__did_open(params)

Put a notebook document into the workspace

Parameters:

params (DidOpenNotebookDocumentParams) –

lsp_set_trace(params)

Changes server trace value.

Parameters:

params (types.SetTraceParams) –

Return type:

Generator[Any, Any, None]

lsp_shutdown(*args)

Request from client which asks server to shutdown.

Return type:

Generator[Any, Any, None]

lsp_text_document__did_change(params)

Updates document’s content. (Incremental(from server capabilities); not configurable for now)

Parameters:

params (DidChangeTextDocumentParams) –

lsp_text_document__did_close(params)

Removes document from workspace.

Parameters:

params (DidCloseTextDocumentParams) –

lsp_text_document__did_open(params)

Puts document to the workspace.

Parameters:

params (DidOpenTextDocumentParams) –

lsp_work_done_progress_cancel(params)

Received a progress cancellation from client.

Parameters:

params (WorkDoneProgressCancelParams) –

lsp_workspace__did_change_workspace_folders(params)

Adds/Removes folders from the workspace.

Parameters:

params (DidChangeWorkspaceFoldersParams) –

lsp_workspace__execute_command(params)

Executes commands with passed arguments and returns a value.

Parameters:

params (types.ExecuteCommandParams) –

Return type:

Generator[Any, Any, Any]

class pygls.protocol.JsonRPCProtocol(server, converter)

Json RPC protocol implementation

Specification of the protocol can be found here: https://www.jsonrpc.org/specification

This class provides bidirectional communication which is needed for LSP.

Parameters:
get_message_type(method)

Return the type definition of the message associated with the given method.

Parameters:

method (str) –

Return type:

Type[Any] | None

get_result_type(method)

Return the type definition of the result associated with the given method.

Parameters:

method (str) –

Return type:

Type[Any] | None

handle_message(message)

Delegates message to handlers depending on message type.

Parameters:

message (RPCNotification | RPCResponse | RPCRequest | RPCError) –

notify(method, params=None)

Send a JSON-RPC notification.

Note

Notifications are “fire-and-forget”, there is no way for the recipient to respond directly to a notification. If you expect a response to this message, use send_request.

Parameters:

  • method (str) – The method name of the message to send

  • params (Any | None) – The payload of the message

send_request(method, params=None, callback=None, msg_id=None)

Send a JSON-RPC request

Parameters:

  • method (str) – The method name of the message to send

  • params (Any | None) – The payload of the message

  • callback (Callable[[Any], None] | None) – If set, the given callback will be called with the result of the future when it resolves

  • msg_id (str | int | None) – Send the request using the given id, if None, an id will be automatically generated

Returns:

A future that will resolve once a response has been received

Return type:

Future[Any]

send_request_async(method, params=None, msg_id=None)

Send a JSON-RPC request, asynchronously.

This method calls send_request , wrapping the resulting future with asyncio.wrap_future so it can be used in an async def function and awaited with the await keyword.

Parameters:

  • method (str) – The method name of the message to send

  • params (Any | None) – The payload of the message

  • callback – If set, the given callback will be called with the result of the future when it resolves

  • msg_id (str | int | None) – Send the request using the given id, if None, an id will be automatically generated

Return type:

asyncio.Future that can be awaited

set_writer(writer, include_headers=True)

Set the writer object to use when sending data

Parameters:

  • writer (AsyncWriter | Writer) – The writer object

  • include_headers (bool) – Flag indicating if headers like Content-Length should be included when sending data. (Default True)

structure_message(data)

Function used to deserialize data recevied from the client.

Parameters:

data (dict[str, Any]) –

property msg_id: str | int | None

Returns the id of the current context (if it exists).

pygls.protocol.default_converter()

Default converter factory function.