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"""Type de filtre regex."""

import re

from primaires.format.fonctions import supprimer_accents
from primaires.recherche.type_filtre import TypeFiltre

class Regex(TypeFiltre):

    """Classe représentant le type de filtre regex.

    Ce filtre est utilisé pour chercher dans une expression rationnelle.

    """

    cle = "regex"
    aide = """
        une expression régulière. Ce peut être une chaîne simple mais
        il y a des options plus précises pour rechercher le début, la
        fin, des expressions plus précises, etc.
    """

    @classmethod
    def tester(cls, objet, attribut, valeur):
        """Méthode testant la valeur.

        Cette méthode doit retourner True si la valeur correspond à la
        recherche, False sinon.

        """
        valeur = supprimer_accents(valeur).lower().replace("_b_", "|")
        attribut = supprimer_accents(attribut).lower()
        try:
            valeur = valeur = re.compile(valeur, re.I)
        except re.error:
            raise TypeError(
                    "le type précisé doit être une expression régulière")
        else:
            return valeur.search(attribut)
