func init()
  if(linked(Result))
    lng.decl_loc_var(res, 'QString')
  end
end

func doBuild(_data)
  fvar(s, r, p, pname, i, t)
  
  s = Mask
  i = pos("%", s)
  r = 'QString()'@str
  while(i)
    p = copy(s,1,i-1) 
    if(p)
      r &&= '.append(' && p && ')'
    end 
    delete(s,1,i)
    t = pos("%",s)
    pname = copy(s,1,t-1)
    if(!cgt.get_point_id(pname))
      error("Point "  + pname + " not found")
    end
    r &&= '.append(' && e_str(point(pname)) && ')'
    delete(s,1,t)
    i = pos("%", s)
  end
  if(s)
    r &&= '.append(' && s && ')'
  end

  if(linked(Result))
    println(res, ' = ', r, ';')
    event(onBuild, res)
  else
    event(onBuild, r)
  end
end

func Result()
  return(res)
end