Ref.lua

--[[
Ref.lua
Strong & Weak References

Copyright (c) 2021 psiberx
]]

local Ref = { version = '1.0.0' }

---@type inkScriptWeakHashMap
local weakMap

---@type inkScriptHashMap
local strongMap

---@param o IScriptable
---@return boolean
function Ref.IsDefined(o)
    return IsDefined(o)
end

---@param o IScriptable
---@return boolean
function Ref.IsExpired(o)
    return not IsDefined(o)
end

---@param a IScriptable
---@param b IScriptable
---@return boolean
function Ref.Equals(a, b)
    return Game['OperatorEqual;IScriptableIScriptable;Bool'](a, b)
end

---@param a IScriptable
---@param b IScriptable
---@return boolean
function Ref.NotEquals(a, b)
    return Game['OperatorNotEqual;IScriptableIScriptable;Bool'](a, b)
end

---@param o IScriptable
---@return IScriptable
function Ref.Weak(o)
    if not weakMap then
        weakMap = inkScriptWeakHashMap.new()
        weakMap:Insert(0, nil)
    end

    weakMap:Set(0, o)

    return weakMap:Get(0)
end

---@param o IScriptable
---@return IScriptable
function Ref.Strong(o)
    if not strongMap then
        strongMap = inkScriptHashMap.new()
        strongMap:Insert(0, nil)
    end

    strongMap:Set(0, o)

    local ref = strongMap:Get(0)

    strongMap:Set(0, nil)

    return ref
end

---@param o IScriptable
---@return Int32
function Ref.Hash(o)
    return CalcSeed(o)
end

return Ref