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Diffstat (limited to 'Master/tlpkg/tlperl.old/lib/Text/Tabs.pm')
-rw-r--r-- | Master/tlpkg/tlperl.old/lib/Text/Tabs.pm | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl.old/lib/Text/Tabs.pm b/Master/tlpkg/tlperl.old/lib/Text/Tabs.pm new file mode 100644 index 00000000000..36107fcfe3e --- /dev/null +++ b/Master/tlpkg/tlperl.old/lib/Text/Tabs.pm @@ -0,0 +1,121 @@ + +package Text::Tabs; + +require Exporter; + +@ISA = (Exporter); +@EXPORT = qw(expand unexpand $tabstop); + +use vars qw($VERSION $tabstop $debug); +$VERSION = 2005.0824; + +use strict; + +BEGIN { + $tabstop = 8; + $debug = 0; +} + +sub expand { + my @l; + my $pad; + for ( @_ ) { + my $s = ''; + for (split(/^/m, $_, -1)) { + my $offs = 0; + s{\t}{ + $pad = $tabstop - (pos() + $offs) % $tabstop; + $offs += $pad - 1; + " " x $pad; + }eg; + $s .= $_; + } + push(@l, $s); + } + return @l if wantarray; + return $l[0]; +} + +sub unexpand +{ + my (@l) = @_; + my @e; + my $x; + my $line; + my @lines; + my $lastbit; + for $x (@l) { + @lines = split("\n", $x, -1); + for $line (@lines) { + $line = expand($line); + @e = split(/(.{$tabstop})/,$line,-1); + $lastbit = pop(@e); + $lastbit = '' unless defined $lastbit; + $lastbit = "\t" + if $lastbit eq " "x$tabstop; + for $_ (@e) { + if ($debug) { + my $x = $_; + $x =~ s/\t/^I\t/gs; + print "sub on '$x'\n"; + } + s/ +$/\t/; + } + $line = join('',@e, $lastbit); + } + $x = join("\n", @lines); + } + return @l if wantarray; + return $l[0]; +} + +1; +__END__ + +sub expand +{ + my (@l) = @_; + for $_ (@l) { + 1 while s/(^|\n)([^\t\n]*)(\t+)/ + $1. $2 . (" " x + ($tabstop * length($3) + - (length($2) % $tabstop))) + /sex; + } + return @l if wantarray; + return $l[0]; +} + + +=head1 NAME + +Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1) + +=head1 SYNOPSIS + + use Text::Tabs; + + $tabstop = 4; + @lines_without_tabs = expand(@lines_with_tabs); + @lines_with_tabs = unexpand(@lines_without_tabs); + +=head1 DESCRIPTION + +Text::Tabs does about what the unix utilities expand(1) and unexpand(1) +do. Given a line with tabs in it, expand will replace the tabs with +the appropriate number of spaces. Given a line with or without tabs in +it, unexpand will add tabs when it can save bytes by doing so. Invisible +compression with plain ascii! + +=head1 BUGS + +expand doesn't handle newlines very quickly -- do not feed it an +entire document in one string. Instead feed it an array of lines. + +=head1 LICENSE + +Copyright (C) 1996-2002,2005 David Muir Sharnoff. +Copyright (C) 2005 Aristotle Pagaltzis +This module may be modified, used, copied, and redistributed at your own risk. +Publicly redistributed modified versions must use a different name. + |