Commit | Line | Data |
cb1a09d0 |
1 | |
75f92628 |
2 | package Text::Tabs; |
a0d0e21e |
3 | |
4 | require Exporter; |
5 | |
6 | @ISA = (Exporter); |
7 | @EXPORT = qw(expand unexpand $tabstop); |
8 | |
8bc713e8 |
9 | use vars qw($VERSION $tabstop $debug); |
4fc6b8d8 |
10 | $VERSION = 96.121201; |
8bc713e8 |
11 | |
12 | use strict; |
13 | |
14 | BEGIN { |
15 | $tabstop = 8; |
16 | $debug = 0; |
17 | } |
a0d0e21e |
18 | |
19 | sub expand |
20 | { |
4633a7c4 |
21 | my @l = @_; |
22 | for $_ (@l) { |
8bc713e8 |
23 | 1 while s/(^|\n)([^\t\n]*)(\t+)/ |
24 | $1. $2 . (" " x |
25 | ($tabstop * length($3) |
26 | - (length($2) % $tabstop))) |
27 | /sex; |
a0d0e21e |
28 | } |
4633a7c4 |
29 | return @l if wantarray; |
4fc6b8d8 |
30 | return $l[0]; |
a0d0e21e |
31 | } |
32 | |
33 | sub unexpand |
34 | { |
8bc713e8 |
35 | my @l = @_; |
a0d0e21e |
36 | my @e; |
8bc713e8 |
37 | my $x; |
38 | my $line; |
39 | my @lines; |
40 | my $lastbit; |
4633a7c4 |
41 | for $x (@l) { |
8bc713e8 |
42 | @lines = split("\n", $x, -1); |
43 | for $line (@lines) { |
44 | $line = expand($line); |
45 | @e = split(/(.{$tabstop})/,$line,-1); |
46 | $lastbit = pop(@e); |
47 | $lastbit = '' unless defined $lastbit; |
48 | $lastbit = "\t" |
49 | if $lastbit eq " "x$tabstop; |
50 | for $_ (@e) { |
51 | if ($debug) { |
52 | my $x = $_; |
53 | $x =~ s/\t/^I\t/gs; |
54 | print "sub on '$x'\n"; |
55 | } |
56 | s/ +$/\t/; |
57 | } |
58 | $line = join('',@e, $lastbit); |
a0d0e21e |
59 | } |
8bc713e8 |
60 | $x = join("\n", @lines); |
a0d0e21e |
61 | } |
4633a7c4 |
62 | return @l if wantarray; |
4fc6b8d8 |
63 | return $l[0]; |
a0d0e21e |
64 | } |
65 | |
66 | 1; |
8bc713e8 |
67 | __END__ |
68 | |
69 | |
70 | =head1 NAME |
71 | |
4fc6b8d8 |
72 | Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1) |
8bc713e8 |
73 | |
74 | =head1 SYNOPSIS |
75 | |
4fc6b8d8 |
76 | use Text::Tabs; |
8bc713e8 |
77 | |
4fc6b8d8 |
78 | $tabstop = 4; |
79 | @lines_without_tabs = expand(@lines_with_tabs); |
80 | @lines_with_tabs = unexpand(@lines_without_tabs); |
8bc713e8 |
81 | |
82 | =head1 DESCRIPTION |
83 | |
84 | Text::Tabs does about what the unix utilities expand(1) and unexpand(1) |
85 | do. Given a line with tabs in it, expand will replace the tabs with |
86 | the appropriate number of spaces. Given a line with or without tabs in |
87 | it, unexpand will add tabs when it can save bytes by doing so. Invisible |
88 | compression with plain ascii! |
89 | |
90 | =head1 BUGS |
91 | |
92 | expand doesn't handle newlines very quickly -- do not feed it an |
93 | entire document in one string. Instead feed it an array of lines. |
94 | |
95 | =head1 AUTHOR |
96 | |
4fc6b8d8 |
97 | David Muir Sharnoff <muir@idiom.com> |