Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) to your zone a DARK Link Monster points to. You can only Special Summon "Rokket Caliber" once per turn this way. You can Tribute this card; Special Summon 1 DARK Dragon or Machine monster from your hand, except "Rokket Caliber". You can only use this effect of "Rokket Caliber" once per turn.
--ヴァレット・キャリバー
--Rokket Caliber
--Scripted by edo9300
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon this card
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetValue(s.spval)
	c:RegisterEffect(e1)
	--Special Summon 1 DARK Dragon or Machine from your hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetCost(Cost.SelfTribute)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
s.listed_names={id}
function s.spval(e,c)
	return 0,aux.GetMMZonesPointedTo(c:GetControler(),Card.IsAttribute,nil,nil,nil,ATTRIBUTE_DARK)
end
function s.spfilter(c,e,tp)
	return c:IsAttribute(ATTRIBUTE_DARK) and c:IsRace(RACE_MACHINE|RACE_DRAGON) and not c:IsCode(id)
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetMZoneCount(tp,e:GetHandler())>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_HAND,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_HAND,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end