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Improve table.merge to do a deep merge

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This commit is contained in:
Alfredo Cardigliano 2025-09-10 15:13:22 +02:00
parent 7f3197e48b
commit 7e9063dde8
1 changed files with 16 additions and 6 deletions
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22
scripts/lua/modules/lua_utils_generic.lua
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@ -81,16 +81,17 @@ end
-- ###########################################
-- Merges table a and table b into a new table. If some elements are presents in
-- both a and b, b elements will have precedence.
-- NOTE: this does *not* perform a deep merge. Only first level is merged.
-- Perform a deep merge of table a and table b into a new table.
-- If some elements are presents in both a and b, if they are both tables they are merged,
-- otherwise b values will have precedence.
-- Note: if a and b are arrays, the first level is merged only (b values have precedence)
function table.merge(a, b, nodup)
local merged = {}
a = a or {}
b = b or {}
if((a[1] ~= nil) and (b[1] ~= nil)) then
-- index based tables
-- index based tables (array)
for _, t in ipairs({a, b}) do
for _,v in pairs(t) do
if not nodup or not table.contains(merged, v) then
@ -99,10 +100,19 @@ function table.merge(a, b, nodup)
end
end
else
-- key based tables
-- key based tables (associative)
for _, t in ipairs({a, b}) do
for k,v in pairs(t) do
merged[k] = v
if merged[k] == nil then
-- Add value
merged[k] = v
elseif type(merged[k]) == "table" and type(v) == "table" then
-- Merge tables
merged[k] = table.merge(merged[k], v)
else
-- Use value in b (last to be set)
merged[k] = v
end
end
end
end