Clingo WebAssembly

Clingo compiled to WebAssembly with Emscripten. Try it online at https://observablehq.com/@cmudig/clingo or https://domoritz.github.io/clingo-wasm.

This repo combines work from two previous repos: https://github.com/Aluriak/webclingo-example and https://github.com/domoritz/wasm-clingo.

Installation and Usage

Node

npm install clingo-wasm or yarn add clingo-wasm.

const clingo = require("clingo-wasm");

clingo.run("a. b:- a.").then(console.log);

In the Browser

Load Clingo from the JSDelivr CDN.

<script src="https://cdn.jsdelivr.net/npm/clingo-wasm@VERSION"></script>

We expose an UMD bundle that runs Clingo in a separate worker thread. Therefore, all commands need to be asynchronous.

<script>
  async function main() {
    // optionally pass URL to WASM file:
    // await clingo.init("https://cdn.jsdelivr.net/npm/clingo-wasm@VERSION/dist/clingo.wasm")
    console.log(await clingo.run("a. b :- a."));
    console.log(await clingo.run("{a; b; c}.", 0));
  }

  main();
</script>

The Clingo worker can also be terminated and restarted with the following API. This API is useful when the Clingo program takes much time and the user want to interrupt it. Moreover, please re-initialize the Clingo WASM after restarting the worker.

<script>
  async function restart() {
    await clingo.restart(
      "https://cdn.jsdelivr.net/npm/clingo-wasm@VERSION/dist/clingo.wasm"
    ); // re-initialize Clingo
  }

  restart();
</script>

Developers

Build WASM file

Run npm run build:wasm if you have Docker. For testing purposes, you can run scripts/build_clingo.sh from the root directory of the project.

Build and Test JavaScript

Run npm run build to build the js files. Run npm test to run tests in node.

Update Lua, Clingo, or Emscripten

Update the versions in scripts/versions.sh and in the badges in this README.md. Then push to a new branch and let GitHub actions build the new WASM file.