Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Plant monsters, including a "Sunavalon" Link Monster This card cannot be targeted for attacks, but does not prevent your opponent from attacking you directly. Twice per turn, if you take battle or effect damage: You can gain that much LP, and if you do, Special Summon 1 "Sunvine" monster from your Extra Deck.
--聖天樹の精霊
--Sunavalon Dryades
--Scripted by Eerie Code, partially based on the anime script
local s,id=GetID()
function s.initial_effect(c)
	--link summon
	c:EnableReviveLimit()
	Link.AddProcedure(c,aux.FilterBoolFunctionEx(Card.IsRace,RACE_PLANT),2,2,s.matcheck)
	--attack target
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetCode(EFFECT_IGNORE_BATTLE_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	--spsummon
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_DAMAGE)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DAMAGE_CAL+EFFECT_FLAG_DELAY)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(2)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_SUNAVALON,SET_SUNVINE}
function s.mfilter(c,lc,sumtype,tp)
	return c:IsSetCard(SET_SUNAVALON,lc,sumtype,tp) and c:IsType(TYPE_LINK,lc,sumtype,tp)
end
function s.matcheck(g,lc,sumtype,tp)
	return g:IsExists(s.mfilter,1,nil,lc,sumtype,tp)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return ep==tp and (r&REASON_BATTLE+REASON_EFFECT)~=0
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_SUNVINE) 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.GetLocationCountFromEx(tp)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_EXTRA,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
	Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,1,tp,ev)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.Recover(tp,ev,REASON_EFFECT)==ev and Duel.GetLocationCountFromEx(tp)>0 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
		local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_EXTRA,0,1,1,nil,e,tp)
		if #g>0 then
			Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
		end
	end
end