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