## no critic (Modules::ProhibitMultiplePackages)
package DateTime::Infinite;

use strict;
use warnings;
use namespace::autoclean;

our $VERSION = '1.54';

use DateTime;
use DateTime::TimeZone;

use base qw(DateTime);

foreach my $m (qw( set set_time_zone truncate )) {
    ## no critic (TestingAndDebugging::ProhibitNoStrict)
    no strict 'refs';
    *{"DateTime::Infinite::$m"} = sub { return $_[0] };
}

sub is_finite   {0}
sub is_infinite {1}

## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _rd2ymd {
    return $_[2] ? ( $_[1] ) x 7 : ( $_[1] ) x 3;
}

sub _seconds_as_components {
    return ( $_[1] ) x 3;
}

sub ymd {
    return $_[0]->iso8601;
}

sub mdy {
    return $_[0]->iso8601;
}

sub dmy {
    return $_[0]->iso8601;
}

sub hms {
    return $_[0]->iso8601;
}

sub hour_12 {
    return $_[0]->_infinity_string;
}

sub hour_12_0 {
    return $_[0]->_infinity_string;
}

sub datetime {
    return $_[0]->_infinity_string;
}

sub stringify {
    return $_[0]->_infinity_string;
}

sub _infinity_string {
    return $_[0]->{utc_rd_days} == DateTime::INFINITY
        ? DateTime::INFINITY . q{}
        : DateTime::NEG_INFINITY . q{};
}

sub _week_values { [ $_[0]->{utc_rd_days}, $_[0]->{utc_rd_days} ] }

sub STORABLE_freeze {return}
sub STORABLE_thaw   {return}

package DateTime::Infinite::Future;

use strict;
use warnings;

use base qw(DateTime::Infinite);

{
    my $Pos = bless {
        utc_rd_days   => DateTime::INFINITY,
        utc_rd_secs   => DateTime::INFINITY,
        local_rd_days => DateTime::INFINITY,
        local_rd_secs => DateTime::INFINITY,
        rd_nanosecs   => DateTime::INFINITY,
        tz            => DateTime::TimeZone->new( name => 'floating' ),
        locale        => FakeLocale->instance,
        },
        __PACKAGE__;

    $Pos->_calc_utc_rd;
    $Pos->_calc_local_rd;

    sub new {$Pos}
}

package DateTime::Infinite::Past;

use strict;
use warnings;

use base qw(DateTime::Infinite);

{
    my $Neg = bless {
        utc_rd_days   => DateTime::NEG_INFINITY,
        utc_rd_secs   => DateTime::NEG_INFINITY,
        local_rd_days => DateTime::NEG_INFINITY,
        local_rd_secs => DateTime::NEG_INFINITY,
        rd_nanosecs   => DateTime::NEG_INFINITY,
        tz            => DateTime::TimeZone->new( name => 'floating' ),
        locale        => FakeLocale->instance,
        },
        __PACKAGE__;

    $Neg->_calc_utc_rd;
    $Neg->_calc_local_rd;

    sub new {$Neg}
}

package    # hide from PAUSE
    FakeLocale;

use strict;
use warnings;

use DateTime::Locale;

my $Instance;

sub instance {
    return $Instance ||= bless { locale => DateTime::Locale->load('en_US') },
        __PACKAGE__;
}

sub id {
    return 'infinite';
}

sub language_id {
    return 'infinite';
}

sub name {
    'Fake locale for Infinite DateTime objects';
}

sub language {
    'Fake locale for Infinite DateTime objects';
}

my @methods = qw(
    script_id
    territory_id
    variant_id
    script
    territory
    variant
    native_name
    native_language
    native_script
    native_territory
    native_variant
);

for my $meth (@methods) {
    ## no critic (TestingAndDebugging::ProhibitNoStrict)
    no strict 'refs';
    *{$meth} = sub {undef};
}

# Totally arbitrary
sub first_day_of_week {
    return 1;
}

sub prefers_24_hour_time {
    return 0;
}

our $AUTOLOAD;

## no critic (ClassHierarchies::ProhibitAutoloading)
sub AUTOLOAD {
    my $self = shift;

    my ($meth) = $AUTOLOAD =~ /::(\w+)$/;

    if ( $meth =~ /format/ && $meth !~ /^(?:day|month|quarter)/ ) {
        return $self->{locale}->$meth(@_);
    }

    return [];
}

1;

# ABSTRACT: Infinite past and future DateTime objects

__END__

=pod

=encoding UTF-8

=head1 NAME

DateTime::Infinite - Infinite past and future DateTime objects

=head1 VERSION

version 1.54

=head1 SYNOPSIS

  my $future = DateTime::Infinite::Future->new;
  my $past   = DateTime::Infinite::Past->new;

=head1 DESCRIPTION

This module provides two L<DateTime> subclasses, C<DateTime::Infinite::Future>
and C<DateTime::Infinite::Past>.

The objects are always in the "floating" timezone, and this cannot be changed.

=head1 METHODS

The only constructor for these two classes is the C<new> method, as shown in
the L</SYNOPSIS>. This method takes no parameters.

All "get" methods in this module simply return infinity, positive or
negative. If the method is expected to return a string, it returns the string
representation of positive or negative infinity used by your system. For
example, on my system calling C<< $dt->year >>> returns a number which when
printed appears either "Inf" or "-Inf".

This also applies to methods that are compound stringifications, which return
the same strings even for things like C<< $dt->ymd >> or C<< $dt->iso8601 >>

The object is not mutable, so the C<< $dt->set >>, C<< $dt->set_time_zone >>,
and C<< $dt->truncate >> methods are all do-nothing methods that simply return
the object they are called with.

Obviously, the C<< $dt->is_finite >> method returns false and the C<<
$dt->is_infinite >> method returns true.

=head1 SEE ALSO

datetime@perl.org mailing list

http://datetime.perl.org/

=head1 BUGS

There seem to be lots of problems when dealing with infinite numbers on
Win32. This may be a problem with this code, Perl, or Win32's IEEE math
implementation. Either way, the module may not be well-behaved on Win32
operating systems.

Bugs may be submitted at L<https://github.com/houseabsolute/DateTime.pm/issues>.

There is a mailing list available for users of this distribution,
L<mailto:datetime@perl.org>.

I am also usually active on IRC as 'autarch' on C<irc://irc.perl.org>.

=head1 SOURCE

The source code repository for DateTime can be found at L<https://github.com/houseabsolute/DateTime.pm>.

=head1 AUTHOR

Dave Rolsky <autarch@urth.org>

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2003 - 2020 by Dave Rolsky.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

The full text of the license can be found in the
F<LICENSE> file included with this distribution.

=cut
