koperkapel/world.py

   1 """ World and player state. """
   2
   3 from .scenes.base import WorldEvent
   4 from .roaches import build_roach
   5
   6
   7 class World:
   8     """ World and player state. """
   9
  10     def __init__(self):
  11         self._state = self._build_initial_state()
  12
  13     @property
  14     def level(self):
  15         return self._state["level"]
  16
  17     @property
  18     def roaches(self):
  19         return self._state["roaches"]
  20
  21     def _build_initial_state(self):
  22         state = {}
  23         state["roaches"] = [
  24             build_roach(self, "roupert"),
  25         ]
  26         state["serums"] = []
  27         state["vehicles"] = {
  28             "current": "walking",
  29             "walking": {
  30                 "seating": [
  31                     "roachel", None, "roeginald",
  32                     None, None, None,
  33                 ]
  34             },
  35             "robot": {"seating": []},
  36             "roomba": {"seating": []},
  37             "quadcopter": {"seating": []},
  38         }
  39         state["weapons"] = {
  40             "current": "spit",
  41         }
  42         state["level"] = {
  43             "name": "level1",
  44         }
  45         return state
  46
  47     def _get_obj(self, name):
  48         parts = name.split(".")
  49         obj = self._state
  50         for p in parts[:-1]:
  51             if isinstance(obj, dict):
  52                 obj = obj[p]
  53             elif isinstance(obj, list):
  54                 obj = obj[int(p)]
  55             else:
  56                 raise KeyError("%r not found in world" % (name,))
  57         return obj, parts[-1]
  58
  59     def _apply_set(self, action, updates):
  60         for name, value in updates.items():
  61             obj, key = self._get_obj(name)
  62             obj[key] = value
  63
  64     def _apply_append(self, action, updates):
  65         for name, value in updates.items():
  66             obj, key = self._get_obj(name)
  67             obj.append(value)
  68
  69     def _apply_pop(self, action, updates):
  70         for name, pos in updates.items():
  71             obj, key = self._get_obj(name)
  72             obj.pop(pos)
  73
  74     def _apply_reset(self, action):
  75         self._state = self._build_initial_state()
  76
  77     def _apply_unknown(self, action, *args, **kw):
  78         raise ValueError("Unknown world event action: %r" % (action,))
  79
  80     def proxy(self):
  81         return WorldDictProxy(self._state)
  82
  83     def apply_event(self, action, *args, **kw):
  84         handler = getattr(self, "_apply_%s" % (action,))
  85         return handler(action, *args, **kw)
  86
  87
  88 def _maybe_subproxy(proxy, name, value):
  89     """ Return a sub world proxy if appropriate. """
  90     if isinstance(value, dict):
  91         prefix = "%s%s." % (proxy._prefix, name)
  92         return WorldDictProxy(value, _prefix=prefix, _top=proxy._top)
  93     elif isinstance(value, list):
  94         prefix = "%s%s." % (proxy._prefix, name)
  95         return WorldListProxy(value, _prefix=prefix, _top=proxy._top)
  96     return value
  97
  98
  99 class WorldBaseProxy:
 100     """ Base for world proxies. """
 101
 102     def __init__(self, state, _prefix='', _top=None):
 103         if _top is None:
 104             _top = self
 105             _events = []
 106         else:
 107             _events = None
 108         self.__dict__.update({
 109             "_state": state,
 110             "_prefix": _prefix,
 111             "_top": _top,
 112             "_events": _events,
 113         })
 114
 115     def _record_change(self, fullname, value, action="set"):
 116         self._events.append(WorldEvent(action, {
 117             fullname: value
 118         }))
 119
 120     def pop_events(self):
 121         events, self._events = self._events, []
 122         return events
 123
 124
 125 class WorldDictProxy(WorldBaseProxy):
 126     """ World dictionary proxy that records changes and produces events. """
 127
 128     def __setattr__(self, name, value):
 129         self._top._record_change("%s%s" % (self._prefix, name), value)
 130
 131     def __getattr__(self, name):
 132         # return None for attributes that don't exist
 133         value = self._state.get(name)
 134         return _maybe_subproxy(self, name, value)
 135
 136     def __setitem__(self, name, value):
 137         return self.__setattr__(name, value)
 138
 139     def __getitem__(self, name):
 140         return self.__getattr__(name)
 141
 142     def items(self):
 143         return (
 144             (k, _maybe_subproxy(self, k, v)) for k, v in self._state.items())
 145
 146
 147 class WorldListProxy(WorldBaseProxy):
 148     """ World list proxy that records changes and produces events. """
 149
 150     def __setitem__(self, index, value):
 151         self._top._record_change("%s%s" % (self._prefix, index), value)
 152
 153     def __getitem__(self, index):
 154         return _maybe_subproxy(self, index, self._state[index])
 155
 156     def __len__(self):
 157         return len(self._state)
 158
 159     def __bool__(self):
 160         return bool(self._state)
 161
 162     def append(self, value):
 163         self._top._record_change(self._prefix, value, action="append")
 164
 165     def pop(self, pos=0):
 166         self._top._record_change(self._prefix, pos, action="pop")