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"""Fichier contenant la classe Operateur, détaillée plus bas."""

from .expression import Expression
from primaires.scripting.constantes.operateurs import OPERATEURS

class Operateur(Expression):
    
    """Expression opérateur.
    
    Les opérateurs sont définis dans le module
    primaires.scripting.constantes.operateurs.
   
    """
    
    nom = "operateur"
    def __init__(self):
        """Constructeur de l'expression."""
        Expression.__init__(self)
        self.operateur = None
    
    def __repr__(self):
        return " op({}) ".format(self.operateur)
    
    def __str__(self):
        return "|mr|" + str(self.operateur) + "|ff|"
    
    @classmethod
    def parsable(cls, chaine):
        """Retourne True si la chaîne est parsable, False sinon."""
        chaine = chaine.lstrip()
        if " " in chaine:
            fin = chaine.find(" ")
        else:
            fin = None
        chaine = chaine[:fin]

        return chaine in OPERATEURS.keys()
    
    @classmethod
    def parser(cls, chaine):
        """Parse la chaîne.
        
        Retourne l'objet créé et la partie non interprétée de la chaîne.
        
        """
        objet = cls()
        chaine = chaine.lstrip()
        if " " in chaine:
            fin = chaine.find(" ")
        else:
            fin = None
        objet.operateur = chaine[:fin]
        chaine = chaine[fin:]
        return objet, chaine
    
    def get_valeur(self, evt):
        """Retourne l'opérateur Python correspondant."""
        return OPERATEURS[self.operateur]
    
    @property
    def code_python(self):
        """Retourne le code Python associé."""
        return OPERATEURS[self.operateur]
