Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Negate any Spell/Trap effects that target exactly 1 DARK monster you control (and no other cards), and if you do, destroy them.
--黒曜岩竜
--Obsidian Dragon
local s,id=GetID()
function s.initial_effect(c)
	--disable
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_DISABLE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(LOCATION_SZONE,LOCATION_SZONE)
	e1:SetTarget(s.distg)
	c:RegisterEffect(e1)
	--disable effect
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_CHAIN_SOLVING)
	e2:SetRange(LOCATION_MZONE)
	e2:SetOperation(s.disop)
	c:RegisterEffect(e2)
	--self destroy
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_SELF_DESTROY)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(LOCATION_SZONE,LOCATION_SZONE)
	e3:SetTarget(s.distg)
	c:RegisterEffect(e3)
	aux.DoubleSnareValidity(c,LOCATION_MZONE)
end
function s.distg(e,c)
	if c:GetCardTargetCount()==0 then return false end
	return c:GetCardTarget():IsExists(s.disfilter,1,nil,e:GetHandlerPlayer())
end
function s.disfilter(c,tp)
	return c:IsControler(tp) and c:IsFaceup() and c:IsLocation(LOCATION_MZONE) and c:IsAttribute(ATTRIBUTE_DARK)
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	if not re:IsSpellTrapEffect() or not re:IsHasProperty(EFFECT_FLAG_CARD_TARGET) then return end
	local g=Duel.GetChainInfo(ev,CHAININFO_TARGET_CARDS)
	if not g or #g==0 then return end
	if g:IsExists(s.disfilter,1,nil,tp) then
		if Duel.NegateEffect(ev) and re:GetHandler():IsRelateToEffect(re) then
			Duel.Destroy(re:GetHandler(),REASON_EFFECT)
		end
	end
end