Paul Lipscomb
e58f06d9fa
Stripped upstream git history; starting point for replacing the native SWELL/Win32 mapping UI with something more suited to bulk editing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
51 lines
1.3 KiB
Lua
51 lines
1.3 KiB
Lua
--!strict
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type ArbitraryTable = { [any]: any }
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--- Returns a new table that is the result of merging t2 into t1.
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---
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--- Values in t2 have precedence.
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---
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--- The result will be mergeable as well. This is good for "modifier chaining".
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---
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--- Typing not ideal because of https://github.com/luau-lang/luau/issues/392#issuecomment-1050344334
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function merged<A, B>(t1: A, t2: B): A & B
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if type(t1) ~= "table" or type(t2) ~= "table" then
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return t1 :: any
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end
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local result = table.clone(t1)
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for key, new_value in pairs(t2 :: ArbitraryTable) do
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local old_value = result[key]
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if old_value and type(old_value) == "table" and type(new_value) == "table" then
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-- Merge table value as well
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result[key] = merged(old_value, new_value) :: any
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else
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-- Simple use new value
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result[key] = new_value
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end
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end
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return result :: any
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end
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type PartialImpl = {
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new: (part: ArbitraryTable) -> Partial,
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__index: PartialImpl,
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__add: (self: Partial, part: Partial) -> Partial,
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}
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export type Partial = typeof(setmetatable({}, {} :: PartialImpl))
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local Partial: PartialImpl = {} :: PartialImpl
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Partial.__index = Partial
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function Partial.new(part)
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return setmetatable(part, Partial)
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end
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function Partial:__add(part)
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return Partial.new(merged(self, part) :: any)
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end
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return {
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Partial = Partial,
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} |