Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can target 1 "Number C39: Utopia Ray" you control; equip this card from your hand to that target. It gains 1900 ATK. If the equipped monster battles an opponent's monster, the opponent's monster's effect is negated during the Battle Phase only. You can only control 1 "ZW - Unicorn Spear".
--ZW－一角獣皇槍
--ZW - Unicorn Spear
local s,id=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	--equip
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCategory(CATEGORY_EQUIP)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.eqcon)
	e1:SetTarget(s.eqtg)
	e1:SetOperation(s.eqop)
	c:RegisterEffect(e1)
	aux.AddZWEquipLimit(c,s.eqcon,function(tc,c,tp) return s.filter(tc) and tc:IsControler(tp) end,s.equipop,e1)
	--disable
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e3:SetCode(EVENT_BE_BATTLE_TARGET)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCondition(s.discon)
	e3:SetOperation(s.disop)
	c:RegisterEffect(e3)
end
s.listed_names={56840427}
function s.eqcon(e)
	return e:GetHandler():CheckUniqueOnField(e:GetHandlerPlayer())
end
function s.filter(c)
	return c:IsFaceup() and c:IsCode(56840427)
end
function s.eqtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_SZONE)>0
		and Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToEffect(e) then return end
	local tc=Duel.GetFirstTarget()
	if Duel.GetLocationCount(tp,LOCATION_SZONE)<=0 or not tc:IsRelateToEffect(e) or tc:IsFacedown() or tc:GetControler()~=tp or not c:CheckUniqueOnField(tp) then
		Duel.SendtoGrave(c,REASON_EFFECT)
		return
	end
	s.equipop(c,e,tp,tc)
end
function s.equipop(c,e,tp,tc)
	if not aux.EquipAndLimitRegister(c,e,tp,tc) then return end
	--atkup
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_EQUIP)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(1900)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD)
	c:RegisterEffect(e1)
end
function s.discon(e,tp,eg,ep,ev,re,r,rp)
	local ec=e:GetHandler():GetEquipTarget()
	return ec and (ec==Duel.GetAttacker() or ec==Duel.GetAttackTarget()) and ec:GetBattleTarget()
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetHandler():GetEquipTarget():GetBattleTarget()
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_DISABLE)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_BATTLE)
	tc:RegisterEffect(e1)
	local e2=Effect.CreateEffect(e:GetHandler())
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_DISABLE_EFFECT)
	e2:SetReset(RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_BATTLE)
	tc:RegisterEffect(e2)
end