Syntax
=====

.. code-block:: text

    /fiss_xfem
    /mesh = PROPA_FISS (
        ◆ METHODE_PROPA =/"SIMPLEXE ",
                          /"MAILLAGE ",
                          /"INITIALISATION ",
                          /"GEOMETRIQUE ",
                          /"UPWIND ",
        ◇ OPERATION =/"RIEN" (by default),
                      /"DETECT_COHESIF ",
                      /"PROPA_COHESIF ",
        # If: (equal_to (" METHODE_PROPA ", 'SIMPLEXE')) or (equal_to (" METHODE_PROPA ", 'UPWIND')) or (equal_to (" METHODE_PROPA ", 'GEOMETRIQUE') and equal_to (" OPERATION ", 'RIEN')
            ◆ MODELE = model,
            ◇ TEST_MAIL =/"NON" (by default),
                          /"OUI ",
            ◆ DA_MAX = float,
            ◆ RAYON = float,
            ◇ ZONE_MAJ =/"TOUT ",
                         /"TORE" (by default),
            # If: equal_to (" ZONE_MAJ ", 'TORE')
                ◇ RAYON_TORE = float,
            # If: equal_to (" TEST_MAIL ", 'NON')
                ◆ FISSURE = _F (
                     ◆ FISS_ACTUELLE = fiss_xfem,
                     ◆ FISS_PROPAGEE = co,
                     ◇ NB_POINT_FOND = int,
                     ◆ TABLE = table,
                  ),
                ◆ LOI_PROPA = _F (
                     ◇ LOI = "PARIS ",
                     # If: equal_to (" LOI ", 'PARIS')
                         ◆ C = float,
                         ◆ M = float,
                         ◇ DELTA_K_SEUIL = float,
                     ◆ MATER = subdue,
                  ),
                ◆ COMP_LINE = _F (
                     ◆ COEF_MULT_MINI = float,
                     ◆ COEF_MULT_MAXI = float,
                  ),
                ◇ CRIT_ANGL_BIFURCATION =/"SITT_MAX_DEVER ",
                                          /"SITT_MAX" (by default),
                                          /"K1_ MAX ",
                                          /"K2_ NUL ",
                                          /"PLAN ",
                                          /"ANGLE_IMPO ",
                                          /"ANGLE_IMPO_GAMMA ",
                                          /"ANGLE_IMPO_BETA_GAMMA ",
            # If: equal_to (" TEST_MAIL ", 'OUI')
                ◆ FISSURE = _F (
                     ◆ FISS_ACTUELLE = fiss_xfem,
                     ◆ FISS_PROPAGEE = co,
                  ),
                ◇ ITERATIONS = int (default: 5),
                ◇ TOLERANCE = float (default: 5.0),
        # If: (equal_to (" OPERATION ", 'DETECT_COHESIF'))
            ◆ MODELE = model,
            ◇ TEST_MAIL =/"NON" (by default),
                          /"OUI ",
            ◆ RESULTAT = evol_noli/evol_elas,
            ◇ ZONE_MAJ =/"TOUT ",
                         /"TORE" (by default),
            # If: equal_to (" ZONE_MAJ ", 'TORE')
                ◇ RAYON_TORE = float,
            # If: equal_to (" TEST_MAIL ", 'NON')
                ◆ FISSURE = _F (
                     ◆ FISS_ACTUELLE = fiss_xfem,
                     ◆ FISS_PROPAGEE = co,
                     ◇ NB_POINT_FOND = int,
                     ◆ TABLE = table,
                  ),
                ◇ CRIT_ANGL_BIFURCATION =/"SITT_MAX_DEVER ",
                                          /"SITT_MAX" (by default),
                                          /"K1_ MAX ",
                                          /"K2_ NUL ",
                                          /"PLAN ",
                                          /"ANGLE_IMPO ",
                                          /"ANGLE_IMPO_GAMMA ",
                                          /"ANGLE_IMPO_BETA_GAMMA ",
        # If: (equal_to (" OPERATION ", 'PROPA_COHESIF'))
            ◆ MODELE = model,
            ◆ DA_MAX = float,
            ◇ TEST_MAIL =/"NON" (by default),
                          /"OUI ",
            ◇ ZONE_MAJ =/"TOUT ",
                         /"TORE" (by default),
            # If: equal_to (" ZONE_MAJ ", 'TORE')
                ◇ RAYON_TORE = float,
            # If: equal_to (" TEST_MAIL ", 'NON')
                ◆ FISSURE = _F (
                     ◆ FISS_ACTUELLE = fiss_xfem,
                     ◆ FISS_PROPAGEE = co,
                     ◇ NB_POINT_FOND = int,
                     ◆ TABLE = table,
                  ),
                ◇ CRIT_ANGL_BIFURCATION =/"SITT_MAX" (by default),
                                          /"K1_ MAX ",
                                          /"K2_ NUL ",
                                          /"PLAN ",
                                          /"ANGLE_IMPO ",
        # If: (equal_to (" METHODE_PROPA ", 'MAILLAGE'))
            ◆ MAIL_STRUC = mesh,
            ◆ ITERATION = int,
            ◆ DA_MAX = float,
            ◆ FISSURE = _F (
                 ◆ MAIL_ACTUEL = mesh,
                 ◇ GROUP_MA_FOND = grma (default: FOND),
                 ◇ GROUP_MA_FISS = grma (default: FISS),
                 ◆ FISS_ACTUELLE = fiss_xfem,
                 ◇ MAIL_PROPAGE = co,
                 ◆ TABLE = table,
              ),
            ◆ MAIL_TOTAL = co,
            ◆ LOI_PROPA = _F (
                 ◇ LOI = "PARIS ",
                 # If: equal_to (" LOI ", 'PARIS')
                     ◆ C = float,
                     ◆ M = float,
                     ◇ DELTA_K_SEUIL = float,
                 ◆ MATER = subdue,
              ),
            ◆ COMP_LINE = _F (
                 ◆ COEF_MULT_MINI = float,
                 ◆ COEF_MULT_MAXI = float,
              ),
            ◇ CRIT_ANGL_BIFURCATION =/"SITT_MAX" (by default),
                                      /"SITT_MAX_DEVER ",
                                      /"K1_ MAX ",
                                      /"K2_ NUL ",
                                      /"PLAN ",
                                      /"ANGLE_IMPO ",
        # If: (equal_to (" METHODE_PROPA ", 'INITIALISATION'))
            ◆ MAIL_STRUC = mesh,
            ◆ FORM_FISS =/"DEMI_DROITE ",
                          /"DEMI_PLAN ",
                          /"ELLIPSE ",
            ◇ GROUP_MA_FOND = grma (default: FOND),
            ◇ GROUP_MA_FISS = grma (default: FISS),
            ◆ MAIL_TOTAL = co,
            ◇ MAIL_FISS = co,
            # If: equal_to (" FORM_FISS ", 'DEMI_DROITE')
                ◆ PFON = float,
                ◆ DTAN = float,
            # If: equal_to (" FORM_FISS ", 'DEMI_PLAN')
                ◆ DTAN = float,
                ◆ POINT_ORIG = float,
                ◆ POINT_EXTR = float,
                ◆ NB_POINT_FOND = int,
            # If: equal_to (" FORM_FISS ", 'ELLIPSE')
                ◆ CENTRE = float,
                ◆ DEMI_GRAND_AXE = float,
                ◆ DEMI_PETIT_AXE = float,
                ◆ VECT_X = float,
                ◆ VECT_Y = float,
                ◆ ANGLE_ORIG = float,
                ◆ ANGLE_EXTR = float,
                ◆ NB_POINT_FOND = int,
        ◇ INFO =/0,
                 /1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices