Healing over time, damage over time

The script below is for RPG Maker VX.

The following script implements "healing over time". Put it in the Materials section of the script editor. For each state that includes this healing effect, add the note "[HealingState: X]" where X is the amount of HP that the state recovers each turn. (Don't include the quotation marks. Example: [HealingState: 40]) X can also be a percentage, for example: [HealingState: 15%] . Also implements "damage over time". Similar to "healing over time", but reduces HP instead. Each state that has this ability should have the note [DamageOverTime: X] where X is the amount of HP to subtract and can be a number or a percentage.

class Game_Battler
  def setHPDamage(amount)
    @missed=false
    @evaded=false
    @hp_damage=amount
    @mp_damage=0
    @absorbed=false
    execute_damage(nil)
  end
end


class Scene_Battle
  alias :petero_healingStates_turn_end  :turn_end
  @@_HealingStates=nil
  @@_DamageOverTime=nil
  def turn_end
    if @@_HealingStates==nil
      @@_DamageOverTime={}
      @@_HealingStates={}
      for dataState in $data_states
        next if !dataState
        dataState.note.gsub!(/\[HealingState\:\s*(\d+)\]/i){
          @@_HealingStates[dataState.id]=$1.to_i; next ""
        }
        dataState.note.gsub!(/\[HealingState\:\s*(\d+)%\]/i){
          @@_HealingStates[dataState.id]=-($1.to_i); next ""
        }
        dataState.note.gsub!(/\[DamageOverTime\:\s*(\d+)\]/i){
          @@_DamageOverTime[dataState.id]=$1.to_i; next ""
        }
        dataState.note.gsub!(/\[DamageOverTime\:\s*(\d+)%\]/i){
          @@_DamageOverTime[dataState.id]=-($1.to_i); next ""
        }
      end
    end
    for battler in $game_party.members + $game_troop.members
      damage=0
      for state in @@_HealingStates.keys
        if battler.state?(state)
          amt=@@_HealingStates[state]
          if amt<0
            damage-=battler.maxhp*(-amt)/100
          else
            damage-=amt
          end
        end
      end
      if damage!=0
        battler.setHPDamage(damage)
        display_damage(battler)
        display_state_changes(battler)
        wait(25)
      end
      damage=0
      for state in @@_DamageOverTime.keys
        if battler.state?(state)
          amt=@@_DamageOverTime[state]
          if amt<0
            damage+=battler.maxhp*(-amt)/100
          else
            damage+=amt
          end
        end
      end
      if damage!=0
        battler.setHPDamage(damage)
        display_damage(battler)
        display_state_changes(battler)
        wait(25)
      end
    end
    petero_healingStates_turn_end
  end
end