refactor.rb

class AcronymSolver
  attr_reader :text

  def initialize(text)
    @text = text
  end

  def self.substitutions
    {
      :PPC => 'Pocket PC',
      :DVD => 'Digital Versatile Disc'
    }
  end

  def solve!
    AcronymSolver.substitutions.each do |acronym, solution|
      text.gsub!(/ #{acronym} /, %[ <acronym title="#{solution}">#{acronym}</acronym> ])
    end
    text
  end
end

def acronym_page
  @page = Page.find(params[:id])
  @page.description = AcronymSolver.new(@page.description).solve!
  if @page.save
    flash[:notice] = 'Acronimi sostituiti.'
    redirect_to :action => 'modpag', :id => @page
  end
end

def acronym_image
  @picture = Picture.find(params[:id])
  @picture.text = AcronymSolver.new(@picture.text).solve!
  if @picture.save
    flash[:notice] = 'Acronimi sostituiti.'
    redirect_to :action => 'modpict', :id => @picture.guide.id
  end
end