lsp building a language server from scratch

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building a language server from scratch can be a rewarding experience that enhances your understanding of programming languages, communication protocols, and client-server architecture. the language server protocol (lsp) defines a standardized way for ides and editors to communicate with language servers to provide features like autocompletion, error checking, and more.

here's a step-by-step tutorial on how to build a simple language server using python and the `pygls` library.

prerequisites

basic understanding of python
python installed on your machine (preferably python 3.6+)
familiarity with json-rpc (language server protocol uses json-rpc over ipc or tcp)

step 1: set up your environment

1. **install python**: make sure you have python installed. you can download it from [python.org](https://www.python.org/downloads/).

2. *create a virtual environment* (optional but recommended):


3. **install the required libraries**:


step 2: create a basic language server

1. **set up a basic project structure**:


2. **implement the language server**:
open `server.py` and add the following code:



step 3: run your language server

1. open a terminal and navigate to your project directory:


2. run your language server:


step 4: connect a client to your language server

to fully utilize your language server, you'll need a client that understands lsp. you can use an editor like visual studio code, which has built-in support for lsp.

1. **install the "lsp" extension in visual studio code**.
2. **create a configuration**: in your workspace, create a `.vscode` directory with a `settings.json` file:



replace `path_to_your_server.py` with the actual path to your server file.

3. *open a file with the specified filetype* (e.g., `.my_language`), and your language server should start logging messages to the console, and you should see autocompletion suggestions when typing.

step 5: expand functionality

now that you have a basic ...

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