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