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rust-fsm's Introduction

Finite State Machine (FSM) for Rust

Rust-fsm is finite state machine implementation in Rust. It exposes specific macros to make it fairly expressive to work with. Currently, Scala-like syntax is an inspiration for this library. You can get pretty far with macros, except Rust is currently limited in mutli-statement macros.

Install

Todo

Usage

extern mod fsm;

use fsm;

fn main() {
    // Create a new set of states.
    // `State` defines a new module where each state is defined in.
    defstates! (State -> Unlocked, Locked);

    // Create a new FSM and pass an initial state:
    let mut machine = fsm::StateMachine::new(State::Unlocked);

    // Do something when we lock the machine:
    machine.when(State::Locked, || {
        println!("We have locked it again.");
    });

    machine.switch(State::Locked);
}

Docs

make docs
open docs/fsm/index.html

License

MIT

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rust-fsm's Issues

Recursion

Hi
Your lib looks quite interesting. However, it uses recursion at each state change, and you can't assume rust will do tail call optimization. Did you consider, instead of recursing, have switch to return the new state ? There would be a blocking loop that get the new state and run it, so no stack problem.

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