Concord/concord/builtins/key.lua
Pablo Ariel Mayobre a55efd042a Entity's Keys
You can now give the 'key' component to Entities.

A key will be generated automatically and stored in Entity.key.value.

You can then use this key to fetch the Entity from the World with World:getEntityByKey(key)

The keys are generated with a generator function that can be overriden.
2023-02-14 22:20:34 -03:00

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Lua

local PATH = (...):gsub('%.builtins%.[^%.]+$', '')
local Component = require(PATH..".component")
local getKey = function (self, key)
local entity = self.__entity
if not entity:inWorld() then
error("entity needs to belong to a world")
end
local world = entity:getWorld()
return world:__assignKey(entity, key)
end
local Key = Component("key", function (self, key)
self.value = getKey(self, key)
end)
function Key:deserialize (data)
self.value = getKey(self, data.value)
end
function Key:removed (replaced)
if not replaced then
local entity = self.__entity
if entity:inWorld() then
local world = entity:getWorld()
return world:__clearKey(entity)
end
end
end
return Key