| 1 |
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| 2 | package Text::Tabs;
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| 3 |
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| 4 | require Exporter;
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| 5 |
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| 6 | @ISA = (Exporter);
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| 7 | @EXPORT = qw(expand unexpand $tabstop);
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| 8 |
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| 9 | use vars qw($VERSION $tabstop $debug);
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| 10 | $VERSION = 2005.0824;
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| 11 |
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| 12 | use strict;
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| 13 |
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| 14 | BEGIN {
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| 15 | $tabstop = 8;
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| 16 | $debug = 0;
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| 17 | }
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| 18 |
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| 19 | sub expand {
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| 20 | my @l;
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| 21 | my $pad;
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| 22 | for ( @_ ) {
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| 23 | my $s = '';
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| 24 | for (split(/^/m, $_, -1)) {
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| 25 | my $offs = 0;
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| 26 | s{\t}{
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| 27 | $pad = $tabstop - (pos() + $offs) % $tabstop;
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| 28 | $offs += $pad - 1;
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| 29 | " " x $pad;
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| 30 | }eg;
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| 31 | $s .= $_;
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| 32 | }
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| 33 | push(@l, $s);
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| 34 | }
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| 35 | return @l if wantarray;
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| 36 | return $l[0];
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| 37 | }
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| 38 |
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| 39 | sub unexpand
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| 40 | {
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| 41 | my (@l) = @_;
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| 42 | my @e;
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| 43 | my $x;
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| 44 | my $line;
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| 45 | my @lines;
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| 46 | my $lastbit;
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| 47 | for $x (@l) {
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| 48 | @lines = split("\n", $x, -1);
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| 49 | for $line (@lines) {
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| 50 | $line = expand($line);
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| 51 | @e = split(/(.{$tabstop})/,$line,-1);
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| 52 | $lastbit = pop(@e);
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| 53 | $lastbit = '' unless defined $lastbit;
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| 54 | $lastbit = "\t"
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| 55 | if $lastbit eq " "x$tabstop;
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| 56 | for $_ (@e) {
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| 57 | if ($debug) {
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| 58 | my $x = $_;
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| 59 | $x =~ s/\t/^I\t/gs;
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| 60 | print "sub on '$x'\n";
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| 61 | }
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| 62 | s/ +$/\t/;
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| 63 | }
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| 64 | $line = join('',@e, $lastbit);
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| 65 | }
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| 66 | $x = join("\n", @lines);
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| 67 | }
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| 68 | return @l if wantarray;
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| 69 | return $l[0];
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| 70 | }
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| 71 |
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| 72 | 1;
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| 73 | __END__
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| 74 |
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| 75 | sub expand
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| 76 | {
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| 77 | my (@l) = @_;
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| 78 | for $_ (@l) {
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| 79 | 1 while s/(^|\n)([^\t\n]*)(\t+)/
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| 80 | $1. $2 . (" " x
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| 81 | ($tabstop * length($3)
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| 82 | - (length($2) % $tabstop)))
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| 83 | /sex;
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| 84 | }
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| 85 | return @l if wantarray;
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| 86 | return $l[0];
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| 87 | }
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| 88 |
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| 89 |
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| 90 | =head1 NAME
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| 91 |
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| 92 | Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1)
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| 93 |
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| 94 | =head1 SYNOPSIS
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| 95 |
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| 96 | use Text::Tabs;
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| 97 |
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| 98 | $tabstop = 4;
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| 99 | @lines_without_tabs = expand(@lines_with_tabs);
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| 100 | @lines_with_tabs = unexpand(@lines_without_tabs);
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| 101 |
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| 102 | =head1 DESCRIPTION
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| 103 |
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| 104 | Text::Tabs does about what the unix utilities expand(1) and unexpand(1)
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| 105 | do. Given a line with tabs in it, expand will replace the tabs with
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| 106 | the appropriate number of spaces. Given a line with or without tabs in
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| 107 | it, unexpand will add tabs when it can save bytes by doing so. Invisible
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| 108 | compression with plain ascii!
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| 109 |
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| 110 | =head1 BUGS
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| 111 |
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| 112 | expand doesn't handle newlines very quickly -- do not feed it an
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| 113 | entire document in one string. Instead feed it an array of lines.
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| 114 |
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| 115 | =head1 LICENSE
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| 116 |
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| 117 | Copyright (C) 1996-2002,2005 David Muir Sharnoff.
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| 118 | Copyright (C) 2005 Aristotle Pagaltzis
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| 119 | This module may be modified, used, copied, and redistributed at your own risk.
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| 120 | Publicly redistributed modified versions must use a different name.
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| 121 |
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