Syntaxe
=======

.. code-block:: text

    fiss_xfem = DEFI_FISS_XFEM(
        ◇ TYPE_DISCONTINUITE = / "FISSURE" (par défaut),
                               / "INTERFACE",
                               / "COHESIF",
        ◆ MAILLAGE = maillage,
        ◇ / MAILLAGE_GRILLE = maillage,
          / FISS_GRILLE = fiss_xfem,
        # Si: equal_to("TYPE_DISCONTINUITE", 'COHESIF')
            ◆ DEFI_FISS = _F(
                 ◇ FONC_LT = formule / fonction,
                 ◇ FONC_LN = formule / fonction,
                 ◆ GROUP_MA_BORD = grma,
                 ◇ FORM_FISS = / "ELLIPSE",
                               / "RECTANGLE",
                               / "CYLINDRE",
                               / "DEMI_PLAN",
                               / "SEGMENT",
                               / "DEMI_DROITE",
                               / "DROITE",
                               / "ENTAILLE",
                 # Si: equal_to("FORM_FISS", 'ELLIPSE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS = / "IN" (par défaut),
                                   / "OUT",
                 # Si: equal_to("FORM_FISS", 'RECTANGLE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◇ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS = / "IN" (par défaut),
                                   / "OUT",
                 # Si: equal_to("FORM_FISS", 'ENTAILLE')
                     ◆ DEMI_LONGUEUR = float,
                     ◆ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # Si: equal_to("FORM_FISS", 'CYLINDRE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # Si: equal_to("FORM_FISS", 'DEMI_PLAN')
                     ◆ PFON = float,
                     ◆ NORMALE = float,
                     ◆ DTAN = float,
                 # Si: equal_to("FORM_FISS", 'SEGMENT')
                     ◆ PFON_ORIG = float,
                     ◆ PFON_EXTR = float,
                 # Si: equal_to("FORM_FISS", 'DEMI_DROITE')
                     ◆ PFON = float,
                     ◆ DTAN = float,
                 # Si: equal_to("FORM_FISS", 'DROITE')
                     ◆ POINT = float,
                     ◆ DTAN = float,
              ),
        # Si: not equal_to("TYPE_DISCONTINUITE", 'COHESIF')
            ◆ DEFI_FISS = _F(
                 ◇ FONC_LT = formule / fonction,
                 ◇ FONC_LN = formule / fonction,
                 ◇ CHAM_NO_LSN = cham_no,
                 ◇ CHAM_NO_LST = cham_no,
                 ◇ GROUP_MA_FISS = grma,
                 ◇ GROUP_MA_FOND = grma,
                 ◇ FORM_FISS = / "ELLIPSE",
                               / "RECTANGLE",
                               / "CYLINDRE",
                               / "DEMI_PLAN",
                               / "SEGMENT",
                               / "DEMI_DROITE",
                               / "DROITE",
                               / "ENTAILLE",
                 # Si: equal_to("FORM_FISS", 'ELLIPSE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS = / "IN" (par défaut),
                                   / "OUT",
                 # Si: equal_to("FORM_FISS", 'RECTANGLE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◇ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS = / "IN" (par défaut),
                                   / "OUT",
                 # Si: equal_to("FORM_FISS", 'ENTAILLE')
                     ◆ DEMI_LONGUEUR = float,
                     ◆ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # Si: equal_to("FORM_FISS", 'CYLINDRE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # Si: equal_to("FORM_FISS", 'DEMI_PLAN')
                     ◆ PFON = float,
                     ◆ NORMALE = float,
                     ◆ DTAN = float,
                 # Si: equal_to("FORM_FISS", 'SEGMENT')
                     ◆ PFON_ORIG = float,
                     ◆ PFON_EXTR = float,
                 # Si: equal_to("FORM_FISS", 'DEMI_DROITE')
                     ◆ PFON = float,
                     ◆ DTAN = float,
                 # Si: equal_to("FORM_FISS", 'DROITE')
                     ◆ POINT = float,
                     ◆ DTAN = float,
              ),
        ◇ GROUP_MA_ENRI = grma,
        # Si: equal_to("TYPE_DISCONTINUITE", 'INTERFACE')
            ◇ CHAM_DISCONTINUITE = / "DEPL" (par défaut),
                                   / "SIGM",
        # Si: equal_to("TYPE_DISCONTINUITE", 'FISSURE')
            ◇ CHAM_DISCONTINUITE = "DEPL",
            ◇ TYPE_ENRI_FOND = / "TOPOLOGIQUE",
                               / "GEOMETRIQUE" (par défaut),
            # Si: equal_to("TYPE_ENRI_FOND", 'GEOMETRIQUE')
                ◇ RAYON_ENRI = float,
                # Si: (not exists("RAYON_ENRI"))
                    ◇ NB_COUCHES = int (défaut: 2),
        # Si: (not exists("MAILLAGE_GRILLE")) and (not exists("FISS_GRILLE"))
            ◇ JONCTION = _F(
                 ◆ FISSURE = fiss_xfem,
                 ◆ POINT = float,
              ),
        ◇ INFO = / 1 (par défaut),
                 / 2,
                 / 3,
    )
    
    ◆ : obligatoire
    ◇ : optionnel
    ⟐ : présent par défaut
    & : ensemble
    / : un seul parmi
    | : plusieurs choix possibles