keypad-fsm/dist/keypad-fsm.es.js

Finite State Machine for a Keypad

import { COMMAND_RENDER } from 'kingly';

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

var _states;
// State monikers

var INIT = "OFF";
var PIN = "PIN";
var NO_PIN = "NO_PIN";
var DONE = "DONE"; // Event monikers

var START = "START";
var CLEAR_CLICKED = "CLEAR_CLICKED";
var SUBMIT_CLICKED = "SUBMIT_CLICKED";
var NUM_KEY_CLICKED = "NUM_KEY_CLICKED"; // Commands

var SUBMIT = "SUBMIT";
var commands = [COMMAND_RENDER, SUBMIT]; // State update
// Basically {a, b: {c, d}}, [{b:{e}]} -> {a, b:{e}}
// All Object.assign caveats apply
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

function updateState(extendedState, extendedStateUpdates) {
  var extendedStateCopy = Object.assign({}, extendedState);
  return extendedStateUpdates.reduce(function (acc, x) {
    return Object.assign(acc, x);
  }, extendedStateCopy);
}

var events = [NUM_KEY_CLICKED, SUBMIT_CLICKED, CLEAR_CLICKED, START];
var states = (_states = {}, _defineProperty(_states, INIT, ""), _defineProperty(_states, PIN, ""), _defineProperty(_states, NO_PIN, ""), _defineProperty(_states, DONE, ""), _states);
var initialControlState = INIT;
var initialExtendedState = {
  pin: ""
};
var transitions = [{
  from: INIT,
  event: START,
  to: NO_PIN,
  action: displayAndEmitNoPin
}, {
  from: NO_PIN,
  event: NUM_KEY_CLICKED,
  to: PIN,
  action: displayAndEmitPin
}, {
  from: PIN,
  event: CLEAR_CLICKED,
  to: NO_PIN,
  action: displayAndEmitNoPin
}, {
  from: PIN,
  event: NUM_KEY_CLICKED,
  to: PIN,
  action: displayAndEmitPin
}, {
  from: PIN,
  event: SUBMIT_CLICKED,
  to: DONE,
  action: displayAndSubmitPin
}]; // Actions

function displayAndEmitNoPin(extendedState, eventData, settings) {
  return {
    updates: [{
      pin: ""
    }],
    outputs: [{
      command: COMMAND_RENDER,
      params: {
        pin: ""
      }
    }]
  };
}

function displayAndEmitPin(extendedState, eventData, settings) {
  var pin = extendedState.pin;
  var digit = eventData;
  var newPin = pin + digit;
  return {
    updates: [{
      pin: newPin
    }],
    outputs: [{
      command: COMMAND_RENDER,
      params: {
        pin: newPin
      }
    }]
  };
}

function displayAndSubmitPin(extendedState, eventData, settings) {
  var pin = extendedState.pin;
  return {
    updates: [],
    outputs: [{
      command: SUBMIT,
      params: {
        pin: pin
      }
    }]
  };
}

var fsmDef = {
  initialControlState: initialControlState,
  initialExtendedState: initialExtendedState,
  states: states,
  events: events,
  transitions: transitions,
  updateState: updateState
};

export { commands, events, fsmDef };
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