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Filename: //lib/x86_64-linux-gnu/perl-base/Text/Tabs.pm
package Text::Tabs; require Exporter; @ISA = (Exporter); @EXPORT = qw(expand unexpand $tabstop); use vars qw($VERSION $SUBVERSION $tabstop $debug); $VERSION = 2013.0523; $SUBVERSION = 'modern'; use strict; use 5.010_000; BEGIN { $tabstop = 8; $debug = 0; } my $CHUNK = qr/\X/; sub _xlen (_) { scalar(() = $_[0] =~ /$CHUNK/g) } sub _xpos (_) { _xlen( substr( $_[0], 0, pos($_[0]) ) ) } sub expand { my @l; my $pad; for ( @_ ) { my $s = ''; for (split(/^/m, $_, -1)) { my $offs = 0; s{\t}{ # this works on both 5.10 and 5.11 $pad = $tabstop - (_xlen(${^PREMATCH}) + $offs) % $tabstop; # this works on 5.11, but fails on 5.10 #XXX# $pad = $tabstop - (_xpos() + $offs) % $tabstop; $offs += $pad - 1; " " x $pad; }peg; $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; my $ts_as_space = " " x $tabstop; for $x (@l) { @lines = split("\n", $x, -1); for $line (@lines) { $line = expand($line); @e = split(/(${CHUNK}{$tabstop})/,$line,-1); $lastbit = pop(@e); $lastbit = '' unless defined $lastbit; $lastbit = "\t" if $lastbit eq $ts_as_space; 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]; }
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