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Make all table copy variants preserve metatables

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This commit is contained in:
Lars Mueller 2022-10-01 13:26:19 +02:00
parent 0d864f0065
commit aca117a244
1 changed files with 31 additions and 10 deletions
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35
table.lua
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@ -327,17 +327,36 @@ function same(a, b)
return is_same(a, b)
end
function shallowcopy(table)
function shallowcopy(
table -- table to copy
, strip_metatables -- whether to strip metatables; falsy by default; metatables are not copied
)
if type(table) ~= "table" then
return table
end
local copy = {}
if not strip_metatables then
setmetatable(copy, getmetatable(table))
end
for key, value in pairs(table) do
copy[key] = value
end
return copy
end
function deepcopy_tree(table)
if type(table) ~= "table" then return table end
function deepcopy_tree(
table -- table; may not contain circular references; cross references will be copied multiple times
, strip_metatables -- whether to strip metatables; falsy by default; metatables are not copied
)
if type(table) ~= "table" then
return table
end
local copy = {}
if not strip_metatables then
setmetatable(copy, getmetatable(table))
end
for key, value in pairs(table) do
copy[deepcopy_tree(key)] = deepcopy_tree(value)
end
@ -361,14 +380,16 @@ function deepcopy(
end
copies[table] = copy
local function _copy(value)
if type(value) == "table" then
if type(value) ~= "table" then
return value
end
if copies[value] then
return copies[value]
end
return _deepcopy(value)
end
return value
end
for key, value in pairs(table) do
copy[_copy(key)] = _copy(value)
end
@ -495,7 +516,7 @@ end
function process(tab, func)
local results = {}
for key, value in pairs(tab) do
table.insert(results, func(key,value))
table.insert(results, func(key, value))
end
return results
end