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test: add all sync tests

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littensy 2025-10-01 01:30:31 -07:00
parent 0dbc0587a0
commit 5a05f01223
5 changed files with 492 additions and 53 deletions
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42
packages/charm-sync/src/patch.luau
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@ -54,19 +54,19 @@ end
--- @param prevState The previous state.
--- @param nextState The next state.
--- @returns A patch that can be applied to the previous state.
local function diff(prevState: { [any]: any }, nextState: { [any]: any })
local patches = table.clone(nextState)
local function diff(prevState: any, nextState: any): any
if prevState == nextState then
return nil
elseif nextState == nil then
return None
elseif type(prevState) ~= "table" or type(nextState) ~= "table" then
return nextState
end
local patches: { [any]: any } = table.clone(nextState)
for key, previous in prevState do
local current = nextState[key]
if previous == current then
patches[key] = nil
elseif current == nil then
patches[key] = None
elseif type(previous) == "table" and type(current) == "table" then
patches[key] = diff(previous, current)
end
patches[key] = diff(previous, nextState[key])
end
if config.autoSerialize then
@ -87,20 +87,20 @@ end
--- Applies a patch to a state and returns the next state.
---
--- @param state The current state.
--- @param patches The patches to apply.
--- @param prevState The current state.
--- @param statePatch The patches to apply.
--- @returns The next state.
local function apply(state: any, patches: any): any
if isNone(patches) then
local function apply(prevState: any, statePatch: any): any
if isNone(statePatch) then
return nil
elseif type(state) ~= "table" or type(patches) ~= "table" then
return patches
elseif type(prevState) ~= "table" or type(statePatch) ~= "table" then
return statePatch
end
local nextState = table.clone(state)
local stateIsArray = state[1] ~= nil
local nextState = table.clone(prevState)
local stateIsArray = prevState[1] ~= nil
for key, patch in patches do
for key, value in statePatch do
-- Diff-checking an array produces a sparse array, which will not be
-- preserved when converted to JSON. To prevent this, we turn string
-- keys back into numeric keys.
@ -108,7 +108,7 @@ local function apply(state: any, patches: any): any
key = tonumber(key) or key
end
nextState[key] = apply(nextState[key], patch)
nextState[key] = apply(nextState[key], value)
end
return nextState