koperkapel/world.py

   1 """ World and player state. """
   2
   3 from .scenes.base import WorldEvent
   4
   5
   6 class World:
   7     """ World and player state. """
   8
   9     def __init__(self):
  10         self._state = self._build_initial_state()
  11
  12     @property
  13     def level(self):
  14         return self._state["level"]
  15
  16     @property
  17     def roaches(self):
  18         return self._state["roaches"]
  19
  20     def _build_initial_state(self):
  21         state = {}
  22         state["roaches"] = [
  23             self._build_roach("roachel", smart=True),
  24             self._build_roach("roeginald", strong=True),
  25             self._build_roach("roichard", fast=True),
  26             self._build_roach("roupert"),
  27         ]
  28         state["serums"] = [
  29             "smart", "strong", "fast",
  30         ]
  31         state["vehicles"] = {
  32             "current": "walking",
  33             "available": ["walking"],
  34         }
  35         state["level"] = {
  36             "name": "level1",
  37         }
  38         return state
  39
  40     def _build_roach(self, name, health=5, **kw):
  41         roach = {
  42             "name": name,
  43             "health": health,
  44         }
  45         roach.update(kw)
  46         return roach
  47
  48     def _apply_set(self, updates):
  49         for name, value in updates.items():
  50             parts = name.split(".")
  51             obj = self._state
  52             for p in parts[:-1]:
  53                 if isinstance(obj, dict):
  54                     obj = obj[p]
  55                 elif isinstance(obj, list):
  56                     obj = obj[int(p)]
  57                 else:
  58                     raise KeyError("%r not found in world" % (name,))
  59             obj[parts[-1]] = value
  60
  61     def proxy(self):
  62         return WorldDictProxy(self._state)
  63
  64     def apply_event(self, action, *args, **kw):
  65         if action == "set":
  66             return self._apply_set(*args, **kw)
  67         raise ValueError("Unknown world event action: %r" % (action,))
  68
  69
  70 def _maybe_subproxy(proxy, name, value):
  71     """ Return a sub world proxy if appropriate. """
  72     if isinstance(value, dict):
  73         prefix = "%s%s." % (proxy._prefix, name)
  74         return WorldDictProxy(value, _prefix=prefix, _top=proxy._top)
  75     elif isinstance(value, list):
  76         prefix = "%s%s." % (proxy._prefix, name)
  77         return WorldListProxy(value, _prefix=prefix, _top=proxy._top)
  78     return value
  79
  80
  81 class WorldBaseProxy:
  82     """ Base for world proxies. """
  83
  84     def __init__(self, state, _prefix='', _top=None):
  85         if _top is None:
  86             _top = self
  87             _events = []
  88         else:
  89             _events = None
  90         self.__dict__.update({
  91             "_state": state,
  92             "_prefix": _prefix,
  93             "_top": _top,
  94             "_events": _events,
  95         })
  96
  97     def _record_change(self, fullname, value):
  98         self._events.append(WorldEvent("set", {
  99             fullname: value
 100         }))
 101
 102     def pop_events(self):
 103         events, self._events = self._events, []
 104         return events
 105
 106
 107 class WorldDictProxy(WorldBaseProxy):
 108     """ World dictionary proxy that records changes and produces events. """
 109
 110     def items(self):
 111         return (
 112             (k, _maybe_subproxy(self, k, v)) for k, v in self._state.items())
 113
 114     def __setattr__(self, name, value):
 115         self._top._record_change("%s%s" % (self._prefix, name), value)
 116
 117     def __getattr__(self, name):
 118         # return None for attributes that don't exist
 119         value = self._state.get(name)
 120         return _maybe_subproxy(self, name, value)
 121
 122
 123 class WorldListProxy(WorldBaseProxy):
 124     """ World list proxy that records changes and produces events. """
 125
 126     def __setitem__(self, index, value):
 127         self._top._record_change("%s%s" % (self._prefix, index), value)
 128
 129     def __getitem__(self, index):
 130         return _maybe_subproxy(self, index, self._state[index])
 131
 132     def __len__(self):
 133         return len(self._state)
 134
 135     def __bool__(self):
 136         return bool(self._state)