72 lines
1.2 KiB
Perl
72 lines
1.2 KiB
Perl
use strict; use warnings;
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package Text::Tabs;
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BEGIN { require Exporter; *import = \&Exporter::import }
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our @EXPORT = qw( expand unexpand $tabstop );
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our $VERSION = '2021.0814';
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our $SUBVERSION = 'modern'; # back-compat vestige
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our $tabstop = 8;
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sub expand {
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my @l;
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my $pad;
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for ( @_ ) {
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defined or do { push @l, ''; next };
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my $s = '';
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for (split(/^/m, $_, -1)) {
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my $offs;
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for (split(/\t/, $_, -1)) {
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if (defined $offs) {
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$pad = $tabstop - $offs % $tabstop;
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$s .= " " x $pad;
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}
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$s .= $_;
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$offs = () = /\PM/g;
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}
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}
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push(@l, $s);
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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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my $ts_as_space = " " x $tabstop;
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for $x (@l) {
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defined $x or next;
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@lines = split("\n", $x, -1);
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for $line (@lines) {
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$line = expand($line);
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@e = split(/((?:\PM\pM*){$tabstop})/,$line,-1);
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$lastbit = pop(@e);
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$lastbit = ''
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unless defined $lastbit;
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$lastbit = "\t"
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if $lastbit eq $ts_as_space;
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for $_ (@e) {
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s/ +$/\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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