#@ MODIF N_CONVERT Noyau  DATE 11/05/2010   AUTEUR COURTOIS M.COURTOIS 
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"""
   Module de conversion des valeurs saisies par l'utilisateur après vérification.
"""

from N_types import is_int, is_float, is_enum


def has_int_value(real):
   """Est-ce que 'real' a une valeur entière ?
   """
   return abs(int(real) - real) < 1.e-12


class Conversion:
   """Conversion de type.
   """
   def __init__(self, name, typ):
      self.name = name
      self.typ  = typ

   def convert(self, obj):
      """Filtre liste
      """
      in_as_enum = is_enum(obj)
      if not in_as_enum:
         obj = (obj,)
      
      result = []
      for o in obj:
         result.append(self.function(o))
      
      if not in_as_enum:
         return result[0]
      else:
         # ne marche pas avec MACR_RECAL qui attend une liste et non un tuple
         return tuple(result)

   def function(self, o):
      raise NotImplementedError, 'cette classe doit être dérivée'


class TypeConversion(Conversion):
   """Conversion de type
   """
   def __init__(self, typ):
      Conversion.__init__(self, 'type', typ)


class IntConversion(TypeConversion):
   """Conversion en entier
   """
   def __init__(self):
      TypeConversion.__init__(self, 'I')

   def function(self, o):
      if is_float(o) and has_int_value(o):
         o = int(o)
      return o


class FloatConversion(TypeConversion):
   """Conversion de type
   """
   def __init__(self):
      TypeConversion.__init__(self, 'R')

   def function(self, o):
      if is_float(o):
         o = float(o)
      return o


_convertI = IntConversion()
_convertR = FloatConversion()

def ConversionFactory(name, typ):
   if name == 'type':
      if 'I' in typ:
         return _convertI
      elif 'R' in typ:
         return _convertR
   return None


