switch (item.sub_type)

    const potion_type ptype = static_cast<potion_type>(item.sub_type);
    if (!this->can_drink_potion(ptype))
        return (false);
    switch (ptype)

    case POT_HEALING:
    case POT_HEAL_WOUNDS:
        if (mons_holiness(this) == MH_UNDEAD
            || mons_holiness(this) == MH_NONLIVING
            || mons_holiness(this) == MH_PLANT)
        {
            return (false);
        }
        break;
    case POT_BLOOD:
    case POT_BLOOD_COAGULATED:
        if (::mons_species(this->type) != MONS_VAMPIRE)
            return (false);
        break;

        // We're being nice: friendlies won't go invisible
        // if the player won't be able to see them.

        // We're being nice: friendlies won't go invisible if the player
        // won't be able to see them.

    else if (mons_is_unique( mon->type ) && one_chance_in(3))

    else if (mons_is_unique(mon->type) && one_chance_in(3))

    if (mons_is_unique( mon->type ) && one_chance_in(5))

    if (mons_is_unique(mon->type) && one_chance_in(5))

            // doesn't really matter

            // doesn't really matter.

    if (mons_species( mon->type ) == MONS_VAMPIRE && one_chance_in(5))

    if (mons_species(mon->type) == MONS_VAMPIRE && one_chance_in(5))

    else if (mons_is_unique( mon->type ) && one_chance_in(3))

    else if (mons_is_unique(mon->type) && one_chance_in(3))