kolanich-libs / pygls

a pythonic generic language server

pygls

pygls (pronounced like "pie glass") is a pythonic generic implementation of the Language Server Protocol for use as a foundation for writing language servers using Python (e.g. Python, XML, etc.). It allows you to write your own language server in just a few lines of code.

Quick Intro

IMPORTANT NOTE:

In order to support type-checking, we added pydantic library which requires passing keyword arguments when creating LSP models.

Here's how to create a server and register a code completion feature:

from pygls.capabilities import COMPLETION
from pygls.server import LanguageServer
from pygls.lsp import CompletionItem, CompletionList, CompletionOptions, CompletionParams

server = LanguageServer()

@server.feature(COMPLETION, CompletionOptions(trigger_characters=[',']))
def completions(params: CompletionParams):
    """Returns completion items."""
    return CompletionList(
        is_incomplete=False,
        items=[
            CompletionItem(label='"'),
            CompletionItem(label='['),
            CompletionItem(label=']'),
            CompletionItem(label='{'),
            CompletionItem(label='}'),
        ]
    )

server.start_tcp('127.0.0.1', 8080)

Show completion list on the client:

Docs and Tutorial

The full documentation and a tutorial is available at https://pygls.readthedocs.io/en/latest/.

Let Us Know How You Are Using pygls

Submit a Pull Request (PR) with your information against the implementations document.

License

Apache-2.0

Contributing

Your contributions to pygls are welcome! Please review the Contributing and Code of Conduct documents for how to get started.

Donation

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