晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/perl5/vendor_perl/TAP/Base.pm
package TAP::Base;

use strict;
use warnings;

use base 'TAP::Object';

=head1 NAME

TAP::Base - Base class that provides common functionality to L<TAP::Parser>
and L<TAP::Harness>

=head1 VERSION

Version 3.42

=cut

our $VERSION = '3.42';

use constant GOT_TIME_HIRES => do {
    eval 'use Time::HiRes qw(time);';
    $@ ? 0 : 1;
};

=head1 SYNOPSIS

    package TAP::Whatever;

    use base 'TAP::Base';

    # ... later ...
    
    my $thing = TAP::Whatever->new();
    
    $thing->callback( event => sub {
        # do something interesting
    } );

=head1 DESCRIPTION

C<TAP::Base> provides callback management.

=head1 METHODS

=head2 Class Methods

=cut

sub _initialize {
    my ( $self, $arg_for, $ok_callback ) = @_;

    my %ok_map = map { $_ => 1 } @$ok_callback;

    $self->{ok_callbacks} = \%ok_map;

    if ( my $cb = delete $arg_for->{callbacks} ) {
        while ( my ( $event, $callback ) = each %$cb ) {
            $self->callback( $event, $callback );
        }
    }

    return $self;
}

=head3 C<callback>

Install a callback for a named event.

=cut

sub callback {
    my ( $self, $event, $callback ) = @_;

    my %ok_map = %{ $self->{ok_callbacks} };

    $self->_croak('No callbacks may be installed')
      unless %ok_map;

    $self->_croak( "Callback $event is not supported. Valid callbacks are "
          . join( ', ', sort keys %ok_map ) )
      unless exists $ok_map{$event};

    push @{ $self->{code_for}{$event} }, $callback;

    return;
}

sub _has_callbacks {
    my $self = shift;
    return keys %{ $self->{code_for} } != 0;
}

sub _callback_for {
    my ( $self, $event ) = @_;
    return $self->{code_for}{$event};
}

sub _make_callback {
    my $self  = shift;
    my $event = shift;

    my $cb = $self->_callback_for($event);
    return unless defined $cb;
    return map { $_->(@_) } @$cb;
}

=head3 C<get_time>

Return the current time using Time::HiRes if available.

=cut

sub get_time { return time() }

=head3 C<time_is_hires>

Return true if the time returned by get_time is high resolution (i.e. if Time::HiRes is available).

=cut

sub time_is_hires { return GOT_TIME_HIRES }

=head3 C<get_times>

Return array reference of the four-element list of CPU seconds,
as with L<perlfunc/times>.

=cut

sub get_times { return [ times() ] }

1;

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