mirror of
https://github.com/Ukendio/jecs.git
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47 lines
1.1 KiB
Text
47 lines
1.1 KiB
Text
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local jecs = require("@jecs")
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local world = jecs.world()
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local IsA = world:entity()
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world:set(IsA, jecs.OnAdd, function(component, id)
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local second = jecs.pair_second(world, id)
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assert(second ~= component, "circular")
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local is_tag = jecs.is_tag(world, second)
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world:added(component, function(entity, _, value)
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if is_tag then
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world:add(entity, second)
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else
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world:set(entity, second, value)
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end
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end)
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world:removed(component, function(entity)
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world:remove(entity, second)
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end)
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if not is_tag then
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world:changed(component, function(entity, _, value)
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world:set(entity, second, value)
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end)
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end
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local r = jecs.record(world, second) :: jecs.Record
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local archetype = r.archetype
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if not archetype then
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return
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end
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local types = archetype.types
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for _, id in types do
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if jecs.is_tag(world, id) then
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world:add(component, id)
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else
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local metadata = world:get(second, id)
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if not world:has(component, id) then
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world:set(component, id, metadata)
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end
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end
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end
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-- jecs.bulk_insert(world, component, ids, values)
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end)
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