qlue-ls 0.6.3

A language server for SPARQL

🦀 Qlue-ls 🦀

⚡Qlue-ls (pronounced "clueless") is a blazingly fast language server for SPARQL, written in Rust 🦀.

[!CAUTION] This Project is still in an early stage.
Only the format capability is production ready.
The rest is experimental.

🚀 Getting Started

📦 Installation

Qlue-ls is available on crate.io:

cargo install qlue-ls

And on PyPI:

pipx install qlue-ls

You can also build it from source:

git clone https://github.com/IoannisNezis/Qlue-ls.git
cd Qlue-ls
cargo build --release --bin qlue-ls

CLI Usage

To run Qlue-ls as formatter run:

qlue-ls format <PATH>

To run Qlue-ls as language server run:

qlue-ls server

This will create a language server listening on stdio.

with Neovim

After you installed the language server, add this to your init.lua:

vim.api.nvim_create_autocmd({ 'FileType' }, {
  desc = 'Connect to Qlue-ls',
  pattern = { 'sparql' },
  callback = function()
    vim.lsp.start {
      name = 'qlue-ls',
      cmd = { 'qlue-ls', 'server' },
      root_dir = vim.fn.getcwd(),
      on_attach = function(client, bufnr)
        vim.keymap.set('n', '<leader>f', vim.lsp.buf.format, { buffer = bufnr, desc = 'LSP: ' .. '[F]ormat' })
      end,
    }
  end,
})

Open a .rq file and check that the buffer is attached to th server:

:checkhealth lsp

Configure keymaps in on_attach function.

🚀 Capabilities

📐 Formatting

Status: Full support

Formats SPARQL queries to ensure consistent and readable syntax. Customizable options to align with preferred query styles are also implemented.

🩺 Diagnostics

Status: Partial support

** provided diagnostics**:

Type	Name	Description
❌ error	undefined prefix	a used prefix is not declared
⚠️ warning	unused prefix	a declared prefix is not used
ℹ️ info	uncompacted uri	a raw uncompacted uri is used

✨ Completion

Status: Partial support

I split auto-completion into 3 stages:

1. Static (Keywords, constructs, ...)
2. Dynamic offline (local defined variables)
3. Dynamic online (with data from a knowledge-graph)

The implementation is in Stage 2.8.
Dynamic online completion works! At the moment the context is limited to the Tripple the completion is requested from. Next step is to introduce full context sensitivity.

🛠️ Code Actions

Status: Partial support

name	description	diagnostic
shorten uri	shorten uri into compacted form	uncompacted uri
declare prefix	declares undeclared prefix (if known)	undeclared prefix
shorten all uri's	shorten all uri's into compacted form
add to result	add variable to selected result
filter variable	add filter for this variable

⚙️ Configuration

Qlue-ls can be configured through a qlue-ls.toml or qlue-ls.yml file.

Here is the full default configuration

[format]
align_predicates = true
align_prefixes = true
separate_prolouge = false
capitalize_keywords = true
insert_spaces = true
tab_size = 10
where_new_line = true
filter_same_line = true

[completion]
timeout_ms = 5000
result_size_limit = 42

🌐 use in web

If you want to connect from a web-based-editor, you can use this package as well.
For this purpose this can be compiled to wasm and is available on npm:

npm i qlue-ls

You will have to wrap this in a Web Worker and provide a language server client. There will be more documentation on this in the future...

Until then you can check out the demo in ./editor/

🏗 Development Setup

Here is a quick guide to set this project up for development.

Requirements

• rust >= 1.83.0
• wasm-pack >= 0.13.1
• node & npm >= 22.14.0 & >= 11.3.0
• [Optional] just
• [Optional] watchexec

Initial Setup

You will only have to do this once.

install node dependencies

cd editor
npm install

build wasm & bindings

If you have just installed:

just build-wasm

If you have make installed:

make wasm

If you don't have just or make installed:

Install just

link against local package

cd pkg
npm link
cd ../editor
npm link qlue-ls

Run application

cd editor
npm run dev

Now the webapp should be running, open the browser on localhost:5173.

Automatically rebuild on change

When developping the cycle is:

• Change the code
• Compile to wasm (or run tests)
• Evaluate

To avoid having to run a command each time to Compile I strongly recommend setting up a auto runner like watchexec.

watchexec --restart --exts rs --exts toml just build-wasm

or just:

just watch-and-run build-wasm

have fun!

🙏 Special Thanks

• TJ DeVries for the inspiration and great tutorials
• Chris Biscardi for teaching me Rust
• GordianDziwis for providing a sparql-tree-sitter grammar