#  Copyright (c) 1997-2020
#  Ewgenij Gawrilow, Michael Joswig, and the polymake team
#  Technische Universität Berlin, Germany
#  https://polymake.org
#
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by the
#  Free Software Foundation; either version 2, or (at your option) any
#  later version: http://www.gnu.org/licenses/gpl.txt.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#-------------------------------------------------------------------------------

use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);

require "constant.pm";
require "Polymake/regex.pl";

package Polymake::Enum;

sub import {
   shift;
   my $pkg = caller;
   my $subpkg = shift;
   $pkg .= "::$subpkg" if $subpkg ne "_";
   $pkg =~ /^$qual_id_re$/o or croak( "Polymake::Enum - invalid package name $pkg" );

   my $consts;
   unless (@_ == 1 && is_hash($consts = $_[0])) {
      my $cnt = 0;
      $consts = { map { ($_ => $cnt++) } @_ };
      $cnt > 0 or croak( "usage:\nuse Polymake::Enum CLASSNAME => { ID => VALUE };\n  or\nuse Polymake::Enum CLASSNAME => qw( ID ... )" );
   }

   my $symtab = get_symtab($pkg, true);
   foreach my $id (keys %$consts) {
      namespaces::declare_const_sub($symtab, $id);
   }

   local caller $symtab;
   constant->import($consts);
}

1

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