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Keep metatables in ecs.default copy

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This commit is contained in:
Étienne Fildadut 2021-12-25 23:00:50 +01:00
parent d9eba04966
commit ef413838d4
1 changed files with 13 additions and 5 deletions
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18
ecs/ecs.can
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@ -70,15 +70,22 @@ let nextEntity = (s)
end
end
--- Recursively copy content of a into b if it isn't already present. No cycle detection.
let copy = (a, b)
--- Recursively copy content of a into b if it isn't already present.
-- Don't copy keys, will preserve metatable but not copy them.
let copy = (a, b, cache={})
for k, v in pairs(a) do
if type(v) == "table" then
if b[k] == nil then
b[k] = {}
copy(v, b[k])
if cache[v] then
b[k] = cache[v]
else
cache[v] = {}
b[k] = cache[v]
copy(v, b[k], cache)
setmetatable(b[k], getmetatable(v))
end
elseif b[k] == "table" then
copy(v, b[k])
copy(v, b[k], cache)
end
elseif b[k] == nil then
b[k] = v
@ -132,6 +139,7 @@ let system_mt = {
visible = true,
--- Defaults value to put into the entities's system table when they are added. Will recursively fill missing values.
-- Metatables will be preserved during the copy but not copied themselves.
--
-- When an entity is added to a system, a `.entity` field is always set in the system table, referring to the full entity table.
--