# -*-coding:Utf-8 -*

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"""Fichier contenant la classe Attribut, définie plus bas."""

class Attribut:
    
    """Définition d'une classe attribut.
    
    Elle prend en paramètre :
    -   un constructeur
    -   une liste de taille inconnue de paramètres à passer au
        constructeur de l'attribut
    
    Elle possède une méthode 'construire' qui retourne l'attribut construit.
    
    """
    
    def __init__(self, constructeur=None, internes=(), l_externes=(),
            d_externes={}):
        """Constructeur d'un attribut"""
        self.constructeur = constructeur
        self.internes = internes
        self.l_externes = l_externes
        self.d_externes = d_externes
    
    def construire(self, objet=None):
        """On construit et retourne l'attribut.
        
        Les paramètres internes sont rattachés à 'objet' passé en paramètre.
        Par exemple, si dans 'internes' se trouve le paramètre
        'description', on récupérera l'attribut 'description' de
        l'objet passé en paramètre.
        
        """
        l_attributs = []
        for attr in self.internes:
            if attr:
                l_attributs.append(getattr(objet, attr))
            else:
                l_attributs.append(objet)
        
        l_attributs.extend(self.l_externes)
        
        if self.constructeur:
            objet = self.constructeur(*l_attributs, **self.d_externes)
        else:
            objet = None
        
        return objet
