Commit | Line | Data |
cb1a09d0 |
1 | |
75f92628 |
2 | package Text::Tabs; |
a0d0e21e |
3 | |
4 | require Exporter; |
5 | |
58389ed2 |
6 | @ISA = (Exporter); |
a0d0e21e |
7 | @EXPORT = qw(expand unexpand $tabstop); |
8 | |
8bc713e8 |
9 | use vars qw($VERSION $tabstop $debug); |
58389ed2 |
10 | $VERSION = 2007.1117; |
8bc713e8 |
11 | |
12 | use strict; |
13 | |
14 | BEGIN { |
15 | $tabstop = 8; |
16 | $debug = 0; |
17 | } |
a0d0e21e |
18 | |
8dfcc161 |
19 | sub expand { |
20 | my @l; |
21 | my $pad; |
22 | for ( @_ ) { |
23 | my $s = ''; |
24 | for (split(/^/m, $_, -1)) { |
25 | my $offs = 0; |
26 | s{\t}{ |
27 | $pad = $tabstop - (pos() + $offs) % $tabstop; |
28 | $offs += $pad - 1; |
29 | " " x $pad; |
30 | }eg; |
31 | $s .= $_; |
32 | } |
33 | push(@l, $s); |
a0d0e21e |
34 | } |
4633a7c4 |
35 | return @l if wantarray; |
4fc6b8d8 |
36 | return $l[0]; |
a0d0e21e |
37 | } |
38 | |
39 | sub unexpand |
40 | { |
e8739726 |
41 | my (@l) = @_; |
a0d0e21e |
42 | my @e; |
8bc713e8 |
43 | my $x; |
44 | my $line; |
45 | my @lines; |
46 | my $lastbit; |
95925ace |
47 | my $ts_as_space = " "x$tabstop; |
4633a7c4 |
48 | for $x (@l) { |
8bc713e8 |
49 | @lines = split("\n", $x, -1); |
50 | for $line (@lines) { |
51 | $line = expand($line); |
52 | @e = split(/(.{$tabstop})/,$line,-1); |
53 | $lastbit = pop(@e); |
95925ace |
54 | $lastbit = '' |
55 | unless defined $lastbit; |
8bc713e8 |
56 | $lastbit = "\t" |
95925ace |
57 | if $lastbit eq $ts_as_space; |
8bc713e8 |
58 | for $_ (@e) { |
59 | if ($debug) { |
60 | my $x = $_; |
61 | $x =~ s/\t/^I\t/gs; |
62 | print "sub on '$x'\n"; |
63 | } |
64 | s/ +$/\t/; |
65 | } |
66 | $line = join('',@e, $lastbit); |
a0d0e21e |
67 | } |
8bc713e8 |
68 | $x = join("\n", @lines); |
a0d0e21e |
69 | } |
4633a7c4 |
70 | return @l if wantarray; |
4fc6b8d8 |
71 | return $l[0]; |
a0d0e21e |
72 | } |
73 | |
74 | 1; |
8bc713e8 |
75 | __END__ |
76 | |
8dfcc161 |
77 | sub expand |
78 | { |
79 | my (@l) = @_; |
80 | for $_ (@l) { |
81 | 1 while s/(^|\n)([^\t\n]*)(\t+)/ |
82 | $1. $2 . (" " x |
83 | ($tabstop * length($3) |
84 | - (length($2) % $tabstop))) |
85 | /sex; |
86 | } |
87 | return @l if wantarray; |
88 | return $l[0]; |
89 | } |
90 | |
8bc713e8 |
91 | |
92 | =head1 NAME |
93 | |
4fc6b8d8 |
94 | Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1) |
8bc713e8 |
95 | |
96 | =head1 SYNOPSIS |
97 | |
6b1c26d6 |
98 | use Text::Tabs; |
8bc713e8 |
99 | |
95925ace |
100 | $tabstop = 4; # default = 8 |
6b1c26d6 |
101 | @lines_without_tabs = expand(@lines_with_tabs); |
102 | @lines_with_tabs = unexpand(@lines_without_tabs); |
8bc713e8 |
103 | |
104 | =head1 DESCRIPTION |
105 | |
95925ace |
106 | Text::Tabs does about what the unix utilities expand(1) and unexpand(1) |
8bc713e8 |
107 | do. Given a line with tabs in it, expand will replace the tabs with |
108 | the appropriate number of spaces. Given a line with or without tabs in |
95925ace |
109 | it, unexpand will add tabs when it can save bytes by doing so (just |
110 | like C<unexpand -a>). Invisible compression with plain ASCII! |
111 | |
112 | =head1 EXAMPLE |
113 | |
114 | #!perl |
115 | # unexpand -a |
116 | use Text::Tabs; |
117 | |
118 | while (<>) { |
119 | print unexpand $_; |
120 | } |
121 | |
122 | Instead of the C<expand> comand, use: |
123 | |
124 | perl -MText::Tabs -n -e 'print expand $_' |
125 | |
126 | Instead of the C<unexpand -a> command, use: |
127 | |
128 | perl -MText::Tabs -n -e 'print unexpand $_' |
8bc713e8 |
129 | |
8dfcc161 |
130 | =head1 LICENSE |
131 | |
95925ace |
132 | Copyright (C) 1996-2002,2005,2006 David Muir Sharnoff. |
8dfcc161 |
133 | Copyright (C) 2005 Aristotle Pagaltzis |
134 | This module may be modified, used, copied, and redistributed at your own risk. |
135 | Publicly redistributed modified versions must use a different name. |
8bc713e8 |
136 | |