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#
# expand and unexpand tabs as per the unix expand and
# unexpand programs.
#
# expand and unexpand operate on arrays of lines.
#
# David Muir Sharnoff <muir@idiom.com>
# Version: 4/19/95
#
package Text::Tabs;
require Exporter;
@ISA = (Exporter);
@EXPORT = qw(expand unexpand $tabstop);
$tabstop = 8;
sub expand
{
my (@l) = @_;
my $l, @k;
my $nl;
for $l (@l) {
$nl = $/ if chomp($l);
@k = split($/,$l);
for $_ (@k) {
1 while s/^([^\t]*)(\t+)/
$1 . (" " x
($tabstop * length($2)
- (length($1) % $tabstop)))
/e;
}
$l = join("\n",@k).$nl;
}
return @l if $#l > 0;
return $l[0];
}
sub unexpand
{
my (@l) = &expand(@_);
my @e;
my $k, @k;
my $nl;
for $k (@l) {
$nl = $/ if chomp($k);
@k = split($/,$k);
for $x (@k) {
@e = split(/(.{$tabstop})/,$x);
for $_ (@e) {
s/ +$/\t/;
}
$x = join('',@e);
}
$k = join("\n",@k).$nl;
}
return @l if $#l > 0;
return $l[0];
}
1;
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