Initial commit

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350

{\fonttbl\f0\fswiss\fcharset0 Helvetica;}

{\colortbl;\red255\green255\blue255;}

\margl1440\margr1440\vieww9000\viewh8400\viewkind0

\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0 No work files for this lesson...}

 No newline at end of file

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350

{\fonttbl\f0\fswiss\fcharset0 Helvetica;}

{\colortbl;\red255\green255\blue255;}

\margl1440\margr1440\vieww9000\viewh8400\viewkind0

\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0 No work files for this lesson...}

 No newline at end of file

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350

{\fonttbl\f0\fswiss\fcharset0 Helvetica;}

{\colortbl;\red255\green255\blue255;}

\margl1440\margr1440\vieww9000\viewh8400\viewkind0

\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0 No work files for this lesson...}

 No newline at end of file

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350

{\fonttbl\f0\fswiss\fcharset0 Helvetica;}

{\colortbl;\red255\green255\blue255;}

\margl1440\margr1440\vieww9000\viewh8400\viewkind0

\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0 No work files for this lesson...}

 No newline at end of file

from pyrsistent import PClass, pmap_field, field, pmap

class Location(PClass):

    name = field(str)

    description = field(str)

    exits = pmap_field(str, str)  # direction name -> location name

class GameState(PClass):

    location = field(Location)

    world = pmap_field(str, Location)

def render(state):

    exits = '\n'.join('* {} to {}'.format(exit, location)

                      for exit, location in state.location.exits.items())

    return "* {name} *\n\n{description}\n\nExits:\n{exits}".format(

        name=state.location.name,

        description=state.location.description,

        exits=exits

    )

def move(state, exit_name):

    location_name = state.location.exits.get(exit_name)

    if location_name is None:

        return None

    target_location = state.world.get(location_name)

    return GameState(location=target_location, world=state.world)

home = Location(name="Home", description="Home is where the heart is!",

                exits={'east': 'Street'})

street = Location(name="Street", description="The street next to your house.",

                  exits={'west': 'Home'})

world = pmap({x.name: x for x in [home, street]})

initial_state = GameState(location=home, world=world)