fsm/dist/tests/01-ping-pong.js

(() => {
  // src/index.ts
  var Machine = function(...states) {
    return { states };
  };
  var State = function(name, ...ons) {
    return { name, ons };
  };
  var On = function(eventName, ...reactions) {
    return { eventName, reactions };
  };
  var Do = function(fn) {
    return { type: "Do", fn };
  };
  var Goto = function(targetStateName) {
    return { type: "Goto", targetStateName };
  };
  var Tick = function(doFunctions) {
    return { doFunctions };
  };
  function interpret(machine, options) {
    let { state, context } = options;
    if (typeof state === "undefined") {
      state = machine.states[0].name;
    }
    const interpreter = { machine, state, context, tickQueues: [] };
    console.log(interpreter);
    send(interpreter, ["entry", null]);
    return interpreter;
  }
  function getState(interpreter) {
    return interpreter.machine.states.find((state) => state.name === interpreter.state);
  }
  function getOns(state, event) {
    return state.ons.filter((on) => on.eventName === event[0]);
  }
  function noop() {
  }
  function send(interpreter, event) {
    const state = getState(interpreter);
    const onsTree = getOns(state, event);
    const reactions = onsTree.map((on) => on.reactions).flat();
    const indexOfFirstGoto = reactions.findIndex((reaction) => reaction.type === "Goto");
    const indexOfFinalReaction = indexOfFirstGoto === -1 ? reactions.length - 1 : indexOfFirstGoto;
    const reactionsUntilFirstGoto = reactions.slice(0, indexOfFinalReaction + 1);
    const functionsToRunInTick = reactionsUntilFirstGoto.map((reaction) => {
      if (reaction.type === "Do") {
        return reaction.fn;
      } else if (reaction.type === "Goto") {
        return (ctx, e, self) => {
          self.state = reaction.targetStateName;
          send(self, ["entry", e]);
        };
      } else {
        return noop;
      }
    });
    const tick = Tick(functionsToRunInTick);
    tick.doFunctions.forEach((fn) => {
      fn(interpreter.context, event, interpreter);
    });
  }

  // src/tests/01-ping-pong.ts
  var wait = (ms) => new Promise((resolve) => {
    setTimeout(() => {
      resolve(1);
    }, ms);
  });
  var makeRequest = (ctx, e, self) => {
    send(ctx.serverActor, ["received-request", self]);
  };
  var sendResponse = (ctx, e, self) => {
    send(ctx.clientActor, ["received-response", self]);
  };
  var startTimer = async (ctx, e, self) => {
    await wait(500);
    send(self, ["timer-finished", null]);
  };
  var log = (ctx, e, self) => {
    console.log(self.state);
  };
  var client = Machine(
    State(
      "idle",
      On(
        "entry",
        Do(log)
      ),
      On(
        "server-created",
        Do((_ctx, [_eventName, serverActor2], self) => {
          self.context.serverActor = serverActor2;
        }),
        Goto("making-request")
      )
    ),
    State(
      "making-request",
      On(
        "entry",
        Do(log),
        Do(makeRequest),
        Goto("awaiting-response")
      )
    ),
    State(
      "awaiting-response",
      On(
        "entry",
        Do(log)
      ),
      On(
        "received-response",
        Do(log),
        Goto("making-request")
      )
    )
  );
  var server = Machine(
    State(
      "awaiting-request",
      On(
        "entry",
        Do(log)
      ),
      On(
        "received-request",
        Do((_ctx, [_eventName, clientActor2], self) => {
          self.context.clientActor = clientActor2;
        }),
        Goto("sending-response")
      )
    ),
    State(
      "sending-response",
      On(
        "entry",
        Do(log),
        Do(startTimer)
      ),
      On(
        "timer-finished",
        Do(sendResponse),
        Goto("awaiting-request")
      )
    )
  );
  var clientActor = interpret(client, { context: {} });
  var serverActor = interpret(server, { context: {} });
  send(clientActor, ["server-created", serverActor]);
})();