Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If an attack is declared involving the equipped monster: Place 1 Spell Counter on this card. The equipped monster gains 500 ATK/DEF for each Spell Counter on this card. If the equipped monster would be destroyed by battle or card effect, you can remove 1 Spell Counter from your field, instead.
--ガーディアンの力
--Power of the Guardians
local s,id=GetID()
function s.initial_effect(c)
	c:EnableCounterPermit(COUNTER_SPELL)
	aux.AddEquipProcedure(c)
	--counter
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_COUNTER)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCondition(s.ctcon)
	e2:SetTarget(s.cttg)
	e2:SetOperation(s.ctop)
	c:RegisterEffect(e2)
	--atk/def
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetValue(s.atkval)
	c:RegisterEffect(e3)
	local e4=e3:Clone()
	e4:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e4)
	--destroy replace
	local e5=Effect.CreateEffect(c)
	e5:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_EQUIP)
	e5:SetCode(EFFECT_DESTROY_REPLACE)
	e5:SetTarget(s.desreptg)
	e5:SetOperation(s.desrepop)
	c:RegisterEffect(e5)
end
s.counter_place_list={COUNTER_SPELL}
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsFaceup() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	Duel.SelectTarget(tp,Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,e:GetHandler(),1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if e:GetHandler():IsRelateToEffect(e) and tc:IsRelateToEffect(e) and tc:IsFaceup() then
		Duel.Equip(tp,e:GetHandler(),tc)
	end
end
function s.ctcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetHandler():GetEquipTarget()
	return Duel.GetAttacker()==tc or Duel.GetAttackTarget()==tc
end
function s.cttg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_COUNTER,nil,1,0,COUNTER_SPELL)
end
function s.ctop(e,tp,eg,ep,ev,re,r,rp)
	if e:GetHandler():IsRelateToEffect(e) then
		e:GetHandler():AddCounter(COUNTER_SPELL,1)
	end
end
function s.atkval(e,c)
	return e:GetHandler():GetCounter(COUNTER_SPELL)*500
end
function s.desreptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	local tg=c:GetEquipTarget()
	if chk==0 then return tg 
		and tg:IsReason(REASON_BATTLE|REASON_EFFECT)
		and Duel.IsCanRemoveCounter(tp,1,0,COUNTER_SPELL,1,REASON_EFFECT) end
	return Duel.SelectEffectYesNo(tp,c,96)
end
function s.desrepop(e,tp,eg,ep,ev,re,r,rp)
	Duel.RemoveCounter(tp,1,0,COUNTER_SPELL,1,REASON_EFFECT|REASON_REPLACE)
end