screepers / screeps-regenerator

Use generators in Screeps

screeps-regenerator

This package implements a babel transformation that allows you to use generators/yield in the game screeps to emulate synchronous, multithreaded programming.

This project is based on regenerator, by Facebook.

Status

Generators can be serialized and deserialized from plan JSON objects, which allows their running state to be stored in Memory. Note that an advanced heap serializer is needed for anything more than trivial examples, because JSON does not allow circular references.

Here is a working example using nothing more than this package:

require('screeps-regenerator-runtime/runtime');

function* main() {
  let counter = 0;
  while (true) {
    console.log("Code has been running for", counter, "ticks");
    yield null;
    counter += 1;
  }
}

exports.loop = function () {
  var thread;
  if (Memory.thread) {
    try {
      thread = regeneratorRuntime.deserializeGenerator(Memory.thread);
    } finally {
      delete Memory.thread;
    }
  } else {
    thread = main();
  }
  let result = thread.next();
  if (!result.done) {
    Memory.thread = regeneratorRuntime.serializeGenerator(thread);
  }
};

Installation

From NPM:

npm install --save-dev screeps-regenerator-preset screeps-regenerator-runtime

From GitHub:

cd path/to/node_modules
git clone git://github.com/facebook/regenerator.git
cd screeps-regenerator
npm install .
npm test

Usage

You have several options for using this module.

Via .babelrc (Recommended)

{
  "presets": ["screeps-regenerator-preset"]
}

Via CLI:

babel --preset screeps-regenerator-prefix script.js

Via Node API:

require("babel-core").transform("code", {
  presets: ["screeps-regenerator-preset"]
});

How can you get involved?

The easiest way to get involved is to try out some scripts yourself and submit feature requests for what you'd like to be able to do. If you're feeling especially brave, you are more than welcome to dive into the runtime code and add new features yourself.