SnakesLadders_FSM.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Finite State Machine for Snakes and Ladders game"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "class State(object):\n",
    "    def __init__(self, ix):\n",
    "        self.index = ix\n",
    "        self.link = None  # placeholder, not None if Snake or Ladder\n",
    "        \n",
    "    def process(self):\n",
    "        \"\"\"Action when landed upon\"\"\"\n",
    "        if self.link:\n",
    "            if self.link > self.index:\n",
    "                # Ladder!\n",
    "                return self.link\n",
    "            else:\n",
    "                # Snake!\n",
    "                return self.link\n",
    "        else:\n",
    "            # link is None: \"Normal\" = not a snake or ladder\n",
    "            return self.index\n",
    "        \n",
    "class GameFSM(object):\n",
    "    def __init__(self, n):\n",
    "        self.all_states = []\n",
    "        for ix in range(n+1):\n",
    "            self.all_states.append(State(ix))\n",
    "            "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "game = GameFSM(16)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[<__main__.State at 0x3c81170>,\n",
       " <__main__.State at 0x3c81190>,\n",
       " <__main__.State at 0x3c811b0>,\n",
       " <__main__.State at 0x3c811d0>,\n",
       " <__main__.State at 0x3c811f0>,\n",
       " <__main__.State at 0x3c81210>,\n",
       " <__main__.State at 0x3c81230>,\n",
       " <__main__.State at 0x3c81250>,\n",
       " <__main__.State at 0x3c81270>,\n",
       " <__main__.State at 0x3c81290>,\n",
       " <__main__.State at 0x3c812b0>,\n",
       " <__main__.State at 0x3c812d0>,\n",
       " <__main__.State at 0x3c812f0>,\n",
       " <__main__.State at 0x3c81310>,\n",
       " <__main__.State at 0x3c81330>,\n",
       " <__main__.State at 0x3c81350>,\n",
       " <__main__.State at 0x3c81370>]"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "game.all_states"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Ladders**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "game.all_states[2].link = 10\n",
    "game.all_states[8].link = 14"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "10"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "game.all_states[2].link"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "**Snakes**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 2",
   "language": "python",
   "name": "python2"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 2
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython2",
   "version": "2.7.5"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}