Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Each time your opponent takes damage from a card effect, except "Dark Room of Nightmare", inflict 300 damage to your opponent.
--悪夢の拷問部屋
--Dark Room of Nightmare
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DAMAGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetCode(EVENT_DAMAGE)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCondition(s.con)
	e2:SetTarget(s.tg)
	e2:SetOperation(s.op)
	c:RegisterEffect(e2)
end
function s.con(e,tp,eg,ep,ev,re,r,rp)
	return ep~=tp and (r&REASON_BATTLE)==0 and re and re:GetHandler():GetCode()~=id
end
function s.tg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsRelateToEffect(e) end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(300)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,300)
end
function s.op(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end