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　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。 . Prv8 Shell

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Directory : /usr/share/perl5/vendor_perl/Pod/Text/

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Current File : //usr/share/perl5/vendor_perl/Pod/Text/Overstrike.pm

# Convert POD data to formatted overstrike text
#
# This was written because the output from:
#
#     pod2text Text.pm > plain.txt; less plain.txt
#
# is not as rich as the output from
#
#     pod2man Text.pm | nroff -man > fancy.txt; less fancy.txt
#
# and because both Pod::Text::Color and Pod::Text::Termcap are not device
# independent.
#
# SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl

##############################################################################
# Modules and declarations
##############################################################################

package Pod::Text::Overstrike;

use 5.006;
use strict;
use warnings;

use vars qw(@ISA $VERSION);

use Pod::Text ();

@ISA = qw(Pod::Text);

$VERSION = '4.11';

##############################################################################
# Overrides
##############################################################################

# Make level one headings bold, overriding any existing formatting.
sub cmd_head1 {
    my ($self, $attrs, $text) = @_;
    $text =~ s/\s+$//;
    $text = $self->strip_format ($text);
    $text =~ s/(.)/$1\b$1/g;
    return $self->SUPER::cmd_head1 ($attrs, $text);
}

# Make level two headings bold, overriding any existing formatting.
sub cmd_head2 {
    my ($self, $attrs, $text) = @_;
    $text =~ s/\s+$//;
    $text = $self->strip_format ($text);
    $text =~ s/(.)/$1\b$1/g;
    return $self->SUPER::cmd_head2 ($attrs, $text);
}

# Make level three headings underscored, overriding any existing formatting.
sub cmd_head3 {
    my ($self, $attrs, $text) = @_;
    $text =~ s/\s+$//;
    $text = $self->strip_format ($text);
    $text =~ s/(.)/_\b$1/g;
    return $self->SUPER::cmd_head3 ($attrs, $text);
}

# Level four headings look like level three headings.
sub cmd_head4 {
    my ($self, $attrs, $text) = @_;
    $text =~ s/\s+$//;
    $text = $self->strip_format ($text);
    $text =~ s/(.)/_\b$1/g;
    return $self->SUPER::cmd_head4 ($attrs, $text);
}

# The common code for handling all headers.  We have to override to avoid
# interpolating twice and because we don't want to honor alt.
sub heading {
    my ($self, $text, $indent, $marker) = @_;
    $self->item ("\n\n") if defined $$self{ITEM};
    $text .= "\n" if $$self{opt_loose};
    my $margin = ' ' x ($$self{opt_margin} + $indent);
    $self->output ($margin . $text . "\n");
    return '';
}

# Fix the various formatting codes.
sub cmd_b { local $_ = $_[0]->strip_format ($_[2]); s/(.)/$1\b$1/g; $_ }
sub cmd_f { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ }
sub cmd_i { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ }

# Output any included code in bold.
sub output_code {
    my ($self, $code) = @_;
    $code =~ s/(.)/$1\b$1/g;
    $self->output ($code);
}

# Strip all of the formatting from a provided string, returning the stripped
# version.
sub strip_format {
    my ($self, $text) = @_;
    $text =~ s/(.)[\b]\1/$1/g;
    $text =~ s/_[\b]//g;
    return $text;
}

# We unfortunately have to override the wrapping code here, since the normal
# wrapping code gets really confused by all the backspaces.
sub wrap {
    my $self = shift;
    local $_ = shift;
    my $output = '';
    my $spaces = ' ' x $$self{MARGIN};
    my $width = $$self{opt_width} - $$self{MARGIN};
    while (length > $width) {
        # This regex represents a single character, that's possibly underlined
        # or in bold (in which case, it's three characters; the character, a
        # backspace, and a character).  Use [^\n] rather than . to protect
        # against odd settings of $*.
        my $char = '(?:[^\n][\b])?[^\n]';
        if (s/^((?>$char){0,$width})(?:\Z|\s+)//) {
            $output .= $spaces . $1 . "\n";
        } else {
            last;
        }
    }
    $output .= $spaces . $_;
    $output =~ s/\s+$/\n\n/;
    return $output;
}

##############################################################################
# Module return value and documentation
##############################################################################

1;
__END__

=for stopwords
overstrike overstruck Overstruck Allbery terminal's

=head1 NAME

Pod::Text::Overstrike - Convert POD data to formatted overstrike text

=head1 SYNOPSIS

    use Pod::Text::Overstrike;
    my $parser = Pod::Text::Overstrike->new (sentence => 0, width => 78);

    # Read POD from STDIN and write to STDOUT.
    $parser->parse_from_filehandle;

    # Read POD from file.pod and write to file.txt.
    $parser->parse_from_file ('file.pod', 'file.txt');

=head1 DESCRIPTION

Pod::Text::Overstrike is a simple subclass of Pod::Text that highlights
output text using overstrike sequences, in a manner similar to nroff.
Characters in bold text are overstruck (character, backspace, character)
and characters in underlined text are converted to overstruck underscores
(underscore, backspace, character).  This format was originally designed
for hard-copy terminals and/or line printers, yet is readable on soft-copy
(CRT) terminals.

Overstruck text is best viewed by page-at-a-time programs that take
advantage of the terminal's B<stand-out> and I<underline> capabilities, such
as the less program on Unix.

Apart from the overstrike, it in all ways functions like Pod::Text.  See
L<Pod::Text> for details and available options.

=head1 BUGS

Currently, the outermost formatting instruction wins, so for example
underlined text inside a region of bold text is displayed as simply bold.
There may be some better approach possible.

=head1 AUTHOR

Originally written by Joe Smith <Joe.Smith@inwap.com>, using the framework
created by Russ Allbery <rra@cpan.org>.  Subsequently updated by Russ Allbery.

=head1 COPYRIGHT AND LICENSE

Copyright 2000 by Joe Smith <Joe.Smith@inwap.com>

Copyright 2001, 2004, 2008, 2014, 2018 by Russ Allbery <rra@cpan.org>

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

=head1 SEE ALSO

L<Pod::Text>, L<Pod::Simple>

The current version of this module is always available from its web site at
L<https://www.eyrie.org/~eagle/software/podlators/>.  It is also part of the
Perl core distribution as of 5.6.0.

=cut

# Local Variables:
# copyright-at-end-flag: t
# End:

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