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local Data = {}
---@generic T : string
---@param values T[]
---@return table<T, T>
function Data.enum(values)
local result = {}
for i = 1, #values do
local v = values[i]
result[v] = v
end
return result
end
---@generic T
---@param list T[]
---@return table<T, boolean>
function Data.set_of(list)
local set = {}
for i = 1, #list do
set[list[i]] = true
end
return set
end
---@generic T
---@param list T[]
---@return T[]
function Data.list_reverse(list)
local result = {}
for i = #list, 1, -1 do
result[#result + 1] = list[i]
end
return result
end
---@generic T, U
---@param fn fun(item: T): U
---@param list T[]
---@return U[]
function Data.list_map(fn, list)
local result = {}
for i = 1, #list do
result[#result + 1] = fn(list[i], i)
end
return result
end
function Data.table_pack(...)
return { n = select("#", ...), ... }
end
function Data.list_not_nil(...)
local result = {}
local args = Data.table_pack(...)
for i = 1, args.n do
if args[i] ~= nil then
result[#result + 1] = args[i]
end
end
return result
end
function Data.tbl_pack(...)
return { n = select("#", ...), ... }
end
function Data.when(condition, value)
return condition and value or nil
end
function Data.lazy_when(condition, fn)
return condition and fn() or nil
end
function Data.coalesce(...)
local args = Data.tbl_pack(...)
for i = 1, args.n do
local variable = args[i]
if variable ~= nil then
return variable
end
end
end
---@generic T
---@param list T[]
---@return T[] @A shallow copy of the list.
function Data.list_copy(list)
local result = {}
for i = 1, #list do
result[#result + 1] = list[i]
end
return result
end
---@generic T
---@param list T[]
---@param predicate fun(item: T): boolean
---@return T | nil
function Data.list_find_first(list, predicate)
local result
for i = 1, #list do
local entry = list[i]
if predicate(entry) then
return entry
end
end
return result
end
---@generic T
---@param list T[]
---@param predicate fun(item: T): boolean
---@return boolean
function Data.list_any(list, predicate)
for i = 1, #list do
if predicate(list[i]) then
return true
end
end
return false
end
---@generic T : fun(...)
---@param fn T
---@param cache_key_generator fun(...): string | nil
---@return T
function Data.memoize(fn, cache_key_generator)
cache_key_generator = cache_key_generator or function(a)
return a
end
local cache = {}
return function(...)
local key = cache_key_generator(...)
if not cache[key] then
cache[key] = fn(...)
end
return cache[key]
end
end
function Data.lazy(fn)
local ret_val
return function()
if not ret_val then
ret_val = Data.table_pack(fn())
end
return unpack(ret_val, 1, ret_val.n)
end
end
return Data
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