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#
# expand and unexpand tabs as per the unix expand and
# unexpand programs.
#
# expand and unexpand operate on arrays of lines. Do not
# feed strings that contain newlines to them.
#
# David Muir Sharnoff <muir@idiom.com>
#
# Version: 9/21/95
#
=head1 NAME
Text::Tabs -- expand and unexpand tabs
=head1 SYNOPSIS
use Text::Tabs;
#$tabstop = 8; # Defaults
print expand("Hello\tworld");
print unexpand("Hello, world");
$tabstop = 4;
print join("\n",expand(split(/\n/,
"Hello\tworld,\nit's a nice day.\n"
)));
=head1 DESCRIPTION
This module expands and unexpands tabs into spaces, as per the unix expand
and unexpand programs. Either function should be passed an array of strings
(newlines may I<not> be included, and should be used to split an incoming
string into separate elements.) which will be processed and returned.
=head1 AUTHOR
David Muir Sharnoff <muir@idiom.com>
=cut
package Text::Tabs;
require Exporter;
@ISA = (Exporter);
@EXPORT = qw(expand unexpand $tabstop);
$tabstop = 8;
sub expand
{
my @l = @_;
for $_ (@l) {
1 while s/^([^\t]*)(\t+)/
$1 . (" " x
($tabstop * length($2)
- (length($1) % $tabstop)))
/e;
}
return @l if wantarray;
return @l[0];
}
sub unexpand
{
my @l = &expand(@_);
my @e;
for $x (@l) {
@e = split(/(.{$tabstop})/,$x);
for $_ (@e) {
s/ +$/\t/;
}
$x = join('',@e);
}
return @l if wantarray;
return @l[0];
}
1;
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