Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During your opponent's turn, Set cards in your Spell & Trap Zones cannot be destroyed by card effects. Each time a Set card(s) in your Spell & Trap Zone is destroyed by an opponent's card effect: This card gains 800 ATK until the end of this turn. * The above text is unofficial and describes the card's functionality in the OCG.
--クマモール
--Bearblocker
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--indes
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e1:SetProperty(EFFECT_FLAG_SET_AVAILABLE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(LOCATION_SZONE,0)
	e1:SetCondition(s.indcon)
	e1:SetTarget(s.indtg)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	--atk up
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_DESTROYED)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.atkcon)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
end
function s.indcon(e)
	return Duel.GetTurnPlayer()~=e:GetHandlerPlayer()
end
function s.indtg(e,c)
	return c:GetSequence()<5 and c:IsFacedown()
end
function s.filter(c,tp)
	return c:IsPreviousLocation(LOCATION_SZONE) and c:IsPreviousPosition(POS_FACEDOWN)
		and c:IsPreviousControler(tp) and c:GetPreviousSequence()<5
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.filter,1,nil,tp) and rp~=tp
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsFaceup() then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetReset(RESETS_STANDARD_DISABLE_PHASE_END)
		e1:SetValue(800)
		c:RegisterEffect(e1)
	end
end