Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Tribute 1 monster and inflict damage to your opponent equal to half that monster's original ATK. If you activate this card, you cannot activate any other Spell Cards this turn.
--リニアキャノン
--Linear Accelerator Cannon
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DAMAGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	Duel.AddCustomActivityCounter(id,ACTIVITY_CHAIN,s.chainfilter)
end
function s.chainfilter(re,tp,cid)
	return not (re:IsHasType(EFFECT_TYPE_ACTIVATE) and re:IsSpellEffect())
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	e:SetLabel(1)
	if chk==0 then return Duel.GetCustomActivityCount(id,tp,ACTIVITY_CHAIN)==0 and Duel.CheckReleaseGroup(tp,nil,1,nil) end
	local g=Duel.SelectReleaseGroup(tp,nil,1,1,nil)
	local atk=g:GetFirst():GetTextAttack()/2
	if atk<0 then atk=0 end
	e:SetLabel(atk)
	Duel.Release(g,REASON_COST)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EFFECT_CANNOT_ACTIVATE)
	e1:SetTargetRange(1,0)
	e1:SetValue(s.aclimit)
	e1:SetReset(RESET_PHASE|PHASE_END,1)
	Duel.RegisterEffect(e1,tp)
end
function s.aclimit(e,re,tp)
	return re:IsHasType(EFFECT_TYPE_ACTIVATE) and re:IsSpellEffect()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		local res=e:GetLabel()~=0
		e:SetLabel(0)
		return res
	end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(e:GetLabel())
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,e:GetLabel())
	e:SetLabel(0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end