Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When a Synchro Monster(s) is Special Summoned: Target 1 of them; Special Summon 1 "Siphon Token" (Spellcaster-Type/DARK/Level 1/ATK 0/DEF 0). Its Level becomes that monster's current Level and that monster's Level becomes 1.
--星蝕－レベル・クライム－
--Star Siphon
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_names={70391589}
function s.filter(c,e,tp)
	return c:IsFaceup() and c:IsType(TYPE_SYNCHRO) and c:IsCanBeEffectTarget(e)
		and Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,c:GetLevel(),RACE_SPELLCASTER,ATTRIBUTE_DARK)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return eg:IsContains(chkc) and s.filter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and eg:IsExists(s.filter,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=eg:FilterSelect(tp,s.filter,1,1,nil,e,tp)
	Duel.SetTargetCard(g)
	Duel.SetOperationInfo(0,CATEGORY_TOKEN,nil,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	local tc=Duel.GetFirstTarget()
	local lv=1
	if tc and tc:IsRelateToEffect(e) and tc:IsFaceup() then
		lv=tc:GetLevel()
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_CHANGE_LEVEL)
		e1:SetValue(1)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
	end
	if not Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,lv,RACE_SPELLCASTER,ATTRIBUTE_DARK) then return end
	local token=Duel.CreateToken(tp,id+1)
	Duel.SpecialSummonStep(token,0,tp,tp,false,false,POS_FACEUP)
	local e2=Effect.CreateEffect(e:GetHandler())
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_CHANGE_LEVEL)
	e2:SetValue(lv)
	e2:SetReset(RESET_EVENT|RESETS_STANDARD)
	token:RegisterEffect(e2)
	Duel.SpecialSummonComplete()
end