You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
1.8 KiB
97 lines
1.8 KiB
|
|
package Text::Tabs;
|
|
|
|
require Exporter;
|
|
|
|
@ISA = (Exporter);
|
|
@EXPORT = qw(expand unexpand $tabstop);
|
|
|
|
use vars qw($VERSION $tabstop $debug);
|
|
$VERSION = 98.112801;
|
|
|
|
use strict;
|
|
|
|
BEGIN {
|
|
$tabstop = 8;
|
|
$debug = 0;
|
|
}
|
|
|
|
sub expand
|
|
{
|
|
my (@l) = @_;
|
|
for $_ (@l) {
|
|
1 while s/(^|\n)([^\t\n]*)(\t+)/
|
|
$1. $2 . (" " x
|
|
($tabstop * length($3)
|
|
- (length($2) % $tabstop)))
|
|
/sex;
|
|
}
|
|
return @l if wantarray;
|
|
return $l[0];
|
|
}
|
|
|
|
sub unexpand
|
|
{
|
|
my (@l) = @_;
|
|
my @e;
|
|
my $x;
|
|
my $line;
|
|
my @lines;
|
|
my $lastbit;
|
|
for $x (@l) {
|
|
@lines = split("\n", $x, -1);
|
|
for $line (@lines) {
|
|
$line = expand($line);
|
|
@e = split(/(.{$tabstop})/,$line,-1);
|
|
$lastbit = pop(@e);
|
|
$lastbit = '' unless defined $lastbit;
|
|
$lastbit = "\t"
|
|
if $lastbit eq " "x$tabstop;
|
|
for $_ (@e) {
|
|
if ($debug) {
|
|
my $x = $_;
|
|
$x =~ s/\t/^I\t/gs;
|
|
print "sub on '$x'\n";
|
|
}
|
|
s/ +$/\t/;
|
|
}
|
|
$line = join('',@e, $lastbit);
|
|
}
|
|
$x = join("\n", @lines);
|
|
}
|
|
return @l if wantarray;
|
|
return $l[0];
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
|
|
=head1 NAME
|
|
|
|
Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1)
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Text::Tabs;
|
|
|
|
$tabstop = 4;
|
|
@lines_without_tabs = expand(@lines_with_tabs);
|
|
@lines_with_tabs = unexpand(@lines_without_tabs);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Text::Tabs does about what the unix utilities expand(1) and unexpand(1)
|
|
do. Given a line with tabs in it, expand will replace the tabs with
|
|
the appropriate number of spaces. Given a line with or without tabs in
|
|
it, unexpand will add tabs when it can save bytes by doing so. Invisible
|
|
compression with plain ascii!
|
|
|
|
=head1 BUGS
|
|
|
|
expand doesn't handle newlines very quickly -- do not feed it an
|
|
entire document in one string. Instead feed it an array of lines.
|
|
|
|
=head1 AUTHOR
|
|
|
|
David Muir Sharnoff <[email protected]>
|