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             "walking": {
  34                 "seating": [
  35                     "roachel", None, "roeginald",
  36                     None, None, None,
  37                 ]
  38             }
  39         }
  40         state["level"] = {
  41             "name": "level1",
  42         }
  43         return state
  44
  45     def _build_roach(self, name, health=5, **kw):
  46         roach = {
  47             "name": name,
  48             "health": health,
  49         }
  50         roach.update(kw)
  51         return roach
  52
  53     def _apply_set(self, updates):
  54         for name, value in updates.items():
  55             parts = name.split(".")
  56             obj = self._state
  57             for p in parts[:-1]:
  58                 if isinstance(obj, dict):
  59                     obj = obj[p]
  60                 elif isinstance(obj, list):
  61                     obj = obj[int(p)]
  62                 else:
  63                     raise KeyError("%r not found in world" % (name,))
  64             obj[parts[-1]] = value
  65
  66     def proxy(self):
  67         return WorldDictProxy(self._state)
  68
  69     def apply_event(self, action, *args, **kw):
  70         if action == "set":
  71             return self._apply_set(*args, **kw)
  72         raise ValueError("Unknown world event action: %r" % (action,))
  73
  74
  75 def _maybe_subproxy(proxy, name, value):
  76     """ Return a sub world proxy if appropriate. """
  77     if isinstance(value, dict):
  78         prefix = "%s%s." % (proxy._prefix, name)
  79         return WorldDictProxy(value, _prefix=prefix, _top=proxy._top)
  80     elif isinstance(value, list):
  81         prefix = "%s%s." % (proxy._prefix, name)
  82         return WorldListProxy(value, _prefix=prefix, _top=proxy._top)
  83     return value
  84
  85
  86 class WorldBaseProxy:
  87     """ Base for world proxies. """
  88
  89     def __init__(self, state, _prefix='', _top=None):
  90         if _top is None:
  91             _top = self
  92             _events = []
  93         else:
  94             _events = None
  95         self.__dict__.update({
  96             "_state": state,
  97             "_prefix": _prefix,
  98             "_top": _top,
  99             "_events": _events,
 100         })
 101
 102     def _record_change(self, fullname, value):
 103         self._events.append(WorldEvent("set", {
 104             fullname: value
 105         }))
 106
 107     def pop_events(self):
 108         events, self._events = self._events, []
 109         return events
 110
 111
 112 class WorldDictProxy(WorldBaseProxy):
 113     """ World dictionary proxy that records changes and produces events. """
 114
 115     def items(self):
 116         return (
 117             (k, _maybe_subproxy(self, k, v)) for k, v in self._state.items())
 118
 119     def __setattr__(self, name, value):
 120         self._top._record_change("%s%s" % (self._prefix, name), value)
 121
 122     def __getattr__(self, name):
 123         # return None for attributes that don't exist
 124         value = self._state.get(name)
 125         return _maybe_subproxy(self, name, value)
 126
 127     def __setitem__(self, name, value):
 128         return self.__setattr__(name, value)
 129
 130     def __getitem__(self, name):
 131         return self.__getattr__(name)
 132
 133
 134 class WorldListProxy(WorldBaseProxy):
 135     """ World list proxy that records changes and produces events. """
 136
 137     def __setitem__(self, index, value):
 138         self._top._record_change("%s%s" % (self._prefix, index), value)
 139
 140     def __getitem__(self, index):
 141         return _maybe_subproxy(self, index, self._state[index])
 142
 143     def __len__(self):
 144         return len(self._state)
 145
 146     def __bool__(self):
 147         return bool(self._state)