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10 changed files with 249 additions and 550 deletions
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@ -6,9 +6,9 @@ local flags = require(script.Parent.flags)
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local graph = require(script.Parent.graph)
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type Node<T> = graph.Node<T>
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local create = graph.create
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local create_and_open_scope = graph.create_and_open_scope
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local init_scope = graph.init_scope
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local close_scope = graph.close_scope
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local set_child = graph.set_child
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local add_child = graph.add_child
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local capture = graph.capture
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--[[
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@ -29,14 +29,7 @@ todo: investigate behavior in case B is parented to A, and A has no parent or re
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]]
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-- holds parented instance proxies in memory
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local hold: { Instance? } = {}
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-- weakly references instances with properties bound
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local weak: { Instance? } = setmetatable({}, { __mode = "v" }) :: any
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-- unique binding id
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local bind_count = 0
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-- todo: replace with throw's method
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local root do
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@ -74,45 +67,21 @@ function bind(instance: Instance, property: string, setter: (Instance) -> ())
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end
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end
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local node = create(false)
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local binding = create(instance)
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create_and_open_scope(node)
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init_scope(binding)
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-- run setter to capture any nodes being depended on
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local nodes = (capture(setter :: () -> unknown, instance))
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close_scope()
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-- get binding id
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bind_count += 1
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local bind_id = bind_count
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node.effect = function()
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local instance = weak[bind_id]
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if instance == nil then return end
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setter(weak[bind_id] :: Instance)
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end
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binding.effect = setter
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-- register the setter as a side-effect of each node
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for _, n in next, nodes do
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set_child(n, node)
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for _, node in next, nodes do
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add_child(node, binding)
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end
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-- store reference of instance proxy without preventing gc
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weak[bind_id] = instance
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local function ref()
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local _ = node -- prevent gc of node being depended on
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local instance = weak[bind_id] :: Instance
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-- keep proxy in memory if instance is still parented
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hold[bind_id] = instance.Parent and instance or nil
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end
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ref()
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instance:GetPropertyChangedSignal("Parent"):Connect(ref)
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end
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local function bind_property(instance: Instance, property: string, fn: () -> unknown)
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