68 lines
2.7 KiB
Python
68 lines
2.7 KiB
Python
from typing import Iterator
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class World:
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def __init__(self):
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self._to_apply: set[Entity] = set()
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self._entities: set[Entity] = set()
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self._mapping: dict[type, set[Entity]] = {}
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def create_entity(self, *components):
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return Entity(self, *components)
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def remove_entity(self, entity: 'Entity'):
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entity._deleted = True
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self._to_apply.add(entity)
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def apply(self):
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for entity in self._to_apply:
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if entity._deleted:
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self._entities.remove(entity)
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for component_type in entity._components:
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self._mapping[component_type].remove(entity)
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else:
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self._entities.add(entity)
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for component_type, component in entity._to_apply:
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if component is None:
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del entity._components[component_type]
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self._mapping[component_type].remove(entity)
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else:
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entity._components[component_type] = component
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self._mapping.setdefault(component_type, set()).add(entity)
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entity._to_apply.clear()
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def query(self, *needed: type, without: tuple[type] = []) -> Iterator['Entity']:
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if not needed:
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for entity in self._entities:
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if all(without_type not in entity for without_type in without):
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yield entity
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else:
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for entity in self._mapping.get(needed[0], set()):
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if all(entity in self._mapping.get(component_type, set()) for component_type in needed[1:]) and \
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all(without_type not in entity for without_type in without):
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yield entity
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class Entity:
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def __init__(self, world: World, *components):
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self._world = world
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self._to_apply: list[tuple[type, object]] = [(type(component), component) for component in components]
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self._components: dict[type, object] = {}
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self._deleted = False
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self._world._to_apply.add(self)
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def set(self, *components):
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for component in components:
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self._to_apply.append((type(component), component))
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self._world._to_apply.add(self)
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def remove(self, *component_types: type):
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for component_type in component_types:
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if component_type in self._components:
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self._to_apply.append((component_type, None))
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self._world._to_apply.add(self)
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def __getitem__(self, component_type: type) -> object:
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return self._components[component_type]
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def __contains__(self, component_type: type) -> bool:
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return component_type in self._components |