I think I got it, maybe it can be usefull for someone:

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# Convert expression to pov
angle = '20'
macros = {'F': ' ramo translate -x ',
          'X': ' ramo translate -x ',
          '-': ' rotate -z*' + angle + ' ',
          '+': ' rotate  z*' + angle + ' '}

def getsubstr(p):
 count = 1;
 pos = 0;
 while count > 0:
  if p[pos] == '[': count += 1
  if p[pos] == ']': count -= 1
  pos += 1;
 return p[:pos]

def applymacro(p):
 return macros.has_key(p) and macros[p] or ''

def trans(result):
 p = result[0]
 t = result[1:]

 if p == '[':
  sub  = getsubstr(t)
  newt = t[len(sub)+1:]
  return "union { object {" + trans(sub) + "} object {" + trans(newt) + "} }"

 if len(result) > 1:
  r = trans(t)
  if len(r) > 0:
   return "union { object {" + r + "} " + applymacro(p) + "}"

 return applymacro(p)

print trans(result)

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