# -*-coding:Utf-8 -*

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"""Fichier contenant la fonction expression."""

from primaires.scripting.fonction import Fonction
from primaires.scripting.instruction import ErreurExecution
from primaires.format.fonctions import supprimer_accents

class ClasseFonction(Fonction):

    """Test si une chaîne correspond à une expression.

    L'expression est une ou plusieurs chaînes de test. La chaîne testée
    l'est indépendemment de sa ponctuation, ses majuscules ou minuscules
    ou ses accents.

    """
    @classmethod
    def init_types(cls):
        cls.ajouter_types(cls.expression, "str", "str")

    @staticmethod
    def expression(chaine, expression):
        """Retourne vrai si la chaine  se retrouve dans expression.

        L'expression est une chaîne sous la forme :
            "bonjour" pour représenter l'expression bonjour
            "bonjour|salut" retourne vrai si la chaîne est bonjour ou salut

        Le test ne tient pas compte de la ponctuation, ni des majuscules,
        ni des accents.

        """
        chaine = supprimer_accents(chaine).lower()
        chaine = chaine.rstrip(".,?!")
        chaine = chaine.strip()

        if not expression:
            raise ErreurExecution("l'expression testée est vide")

        for exp in expression.split("_b_"):
            exp = supprimer_accents(exp).lower()
            if chaine == exp:
                return True

        return False
