#!/usr/bin/perl

package Math::Base::Convert::Bases;

$VERSION = 0.03;

package Math::Base::Convert;	# into the main package

@BASES = qw( bin dna DNA oct dec hex HEX b62 b64 m64 iru url rex id0 id1 xnt xid b85 ascii );

$signedBase = 16;               # largest allowable known signed base

my $package = __PACKAGE__;
my $packageLen = length __PACKAGE__;

sub _class {
  (my $class = (caller(1))[3]) =~ s/([^:]+)$/_bs::$1/;
  $class;
}

my $callname = __PACKAGE__ . '::_bs::';

# return a pointer to a sub for the array blessed into Package::sub::name
#

my $_bin = bless ['0', '1'], $callname . 'bin';
my $_dna = bless [qw( a c t g )], $callname . 'dna';
my $_DNA = bless [qw( A C T G )], $callname . 'DNA';
my $_ocT = bless ['0'..'7'], $callname . 'ocT';
my $_dec = bless ['0'..'9'], $callname . 'dec';
my $_heX = bless ['0'..'9', 'a'..'f'], $callname . 'heX';
my $_HEX = bless ['0'..'9', 'A'..'F'], $callname . 'HEX';
my $_b62 = bless ['0'..'9', 'a'..'z', 'A'..'Z'], $callname . 'b62';
my $_b64 = bless ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'], $callname . 'b64';
my $_m64 = bless ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'], $callname . 'm64';
my $_iru = bless ['A'..'Z', 'a'..'z', '0'..'9', '[', ']'], $callname . 'iru';
my $_url = bless ['A'..'Z', 'a'..'z', '0'..'9', '*', '-'], $callname . 'url';
my $_rex = bless ['A'..'Z', 'a'..'z', '0'..'9', '!', '-'], $callname . 'rex';
my $_id0 = bless ['A'..'Z', 'a'..'z', '0'..'9', '_', '-'], $callname . 'id0';
my $_id1 = bless ['A'..'Z', 'a'..'z', '0'..'9', '.', '_'], $callname . 'id1';
my $_xnt = bless ['A'..'Z', 'a'..'z', '0'..'9', '.', '-'], $callname . 'xnt';
my $_xid = bless ['A'..'Z', 'a'..'z', '0'..'9', '_', ':'], $callname . 'xid';
my $_b85 = bless ['0'..'9', 'A'..'Z', 'a'..'z', '!', '#',   # RFC 1924 for IPv6 addresses, might need to return Math::BigInt objs
            '$', '%', '&', '(', ')', '*', '+', '-', ';', '<', '=', '>', '?', '@', '^', '_', '`', '{', '|', '}', '~'], $callname . 'b85';

my $_ascii = bless [
	' ','!','"','#','$','%','&',"'",'(',')','*','+',',','-','.','/',
	'0','1','2','3','4','5','6','7','8','9',
	':',';','<','=','>','?','@',
	'A','B','C','D','E','F','G','H','I','J','K','L','M',
	'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
	'[','\\',']','^','_','`',
	'a','b','c','d','e','f','g','h','i','j','k','l','m',
	'n','o','p','q','r','s','t','u','v','w','x','y','z',
	'{','|','}','~'], $callname . 'ascii';		# 7 bit printable ascii, base 96

#my $_ebcdic = bless [qw
#	( 0  1  2  3 37 2D 2E 2F 16  5 25 0B 0C 0D 0E 0F 10 11 12 13 3C 3D 32 26 18 19 3F 27 1C 1D 1E 1F 
#	 40 4F 7F 7B 5B 6C 50 7D 4D 5D 5C 4E 6B 60 4B 61 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 7A 5E 4C 7E 6E 6F 
#	 7C C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 D4 D5 D6 D7 D8 D9 E2 E3 E4 E5 E6 E7 E8 E9 4A E0 5A 5F 6D 
#	 79 81 82 83 84 85 86 87 88 89 91 92 93 94 95 96 97 98 99 A2 A3 A4 A5 A6 A7 A8 A9 C0 6A D0 A1  7 
#	 20 21 22 23 24 15 6 17 28 29 2A 2B 2C 9 0A 1B 30 31 1A 33 34 35 36 8 38 39 3A 3B  4 14 3E E1 41 
#	 42 43 44 45 46 47 48 49 51 52 53 54 55 56 57 58 59 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 
#	 77 78 80 8A 8B 8C 8D 8E 8F 90 9A 9B 9C 9D 9E 9F A0 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8
#	 B9 BA BB BC BD BE BF CA CB CC CD CE CF DA DB DC DD DE DF EA EB EC ED EE EF FA FB FC FD FE FF)], $callname . 'ebcdic';

sub bin { $_bin }
sub dna { $_dna }
sub DNA { $_DNA }
sub ocT { $_ocT }
sub dec { $_dec }
sub heX { $_heX }
sub HEX { $_HEX }
sub b62 { $_b62 }
sub b64 { $_b64 }
sub m64 { $_m64 }
sub iru { $_iru }
sub url { $_url }
sub rex { $_rex }
sub id0 { $_id0 }
sub id1 { $_id1 }
sub xnt { $_xnt }
sub xid { $_xid }
sub b85 { $_b85 }
sub ascii { $_ascii }
#sub ebcdic { $_ebcdic }

# Since we're not using BIcalc, the last test can be eliminated...
################### special treatment for override 'hex' ##################################

sub hex {
		#		unless	our package	and is a BC ref	and not a BI number (which is an ARRAY)
  unless (ref($_[0]) && $package eq substr(ref($_[0]),0,$packageLen) && (local *glob = $_[0]) && *glob{HASH}) {
# $package, $filename, $line, $subroutine, $hasargs
#       0       1        2         3            4
#   if   defined      and    hasargs
    if ( defined $_[0] && (caller(0))[4] ) {
      return CORE::hex $_[0];
    }
  }
  return heX();
}

################### special treatment for override 'oct' #################################
sub oct {
		#		unless	our package	and is a BC ref	and not a BI number (which is an ARRAY)
  unless (ref($_[0]) && $package eq substr(ref($_[0]),0,$packageLen) && (local *glob = $_[0]) && *glob{HASH}) {
# $package, $filename, $line, $subroutine, $hasargs
    #       0       1        2         3            4
#   if   defined      and    hasargs
    if ( defined $_[0] && (caller(0))[4] ) {
      return CORE::oct $_[0];
    }
  }
  return ocT();
}

################################## REMOVE ABOVE CODE ###################

# return a hash of all base pointers
#
sub _bases {
  no strict;
  my %bases;
  foreach (@BASES) {
    my $base = $_->();
    ref($base) =~ /([^:]+)$/;
    $bases{$1} = $base;
  }
  \%bases;
}
1;

__END__

=head1 NAME

Math::Base::Convert::Bases - helper module for bases

=head1 DESCRIPTION

This package contains no documentation

See L<Math::Base::Convert> instead

=head1 AUTHOR

Michael Robinton, michael@bizsystems.com

=head1 COPYRIGHT

Copyright 2012-2015, Michael Robinton

This program is free software; you may redistribute it and/or modify it
under the same terms as Perl itself.   

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.

=cut 

1;