813 lines
23 KiB
Perl
813 lines
23 KiB
Perl
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require 5;
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package Sort::Naturally; # Time-stamp: "2004-12-29 18:30:03 AST"
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$VERSION = '1.03';
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@EXPORT = ('nsort', 'ncmp');
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require Exporter;
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@ISA = ('Exporter');
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use strict;
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use locale;
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use integer;
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#-----------------------------------------------------------------------------
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# constants:
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BEGIN { *DEBUG = sub () {0} unless defined &DEBUG }
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use Config ();
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BEGIN {
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# Make a constant such that if a whole-number string is that long
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# or shorter, we KNOW it's treatable as an integer
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no integer;
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my $x = length(256 ** $Config::Config{'intsize'} / 2) - 1;
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die "Crazy intsize: <$Config::Config{'intsize'}>" if $x < 4;
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eval 'sub MAX_INT_SIZE () {' . $x . '}';
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die $@ if $@;
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print "intsize $Config::Config{'intsize'} => MAX_INT_SIZE $x\n" if DEBUG;
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}
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sub X_FIRST () {-1}
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sub Y_FIRST () { 1}
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my @ORD = ('same', 'swap', 'asis');
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#-----------------------------------------------------------------------------
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# For lack of a preprocessor:
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my($code, $guts);
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$guts = <<'EOGUTS'; # This is the guts of both ncmp and nsort:
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if($x eq $y) {
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# trap this expensive case first, and then fall thru to tiebreaker
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$rv = 0;
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# Convoluted hack to get numerics to sort first, at string start:
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} elsif($x =~ m/^\d/s) {
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if($y =~ m/^\d/s) {
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$rv = 0; # fall thru to normal comparison for the two numbers
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} else {
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$rv = X_FIRST;
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DEBUG > 1 and print "Numeric-initial $x trumps letter-initial $y\n";
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}
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} elsif($y =~ m/^\d/s) {
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$rv = Y_FIRST;
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DEBUG > 1 and print "Numeric-initial $y trumps letter-initial $x\n";
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} else {
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$rv = 0;
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}
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unless($rv) {
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# Normal case:
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$rv = 0;
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DEBUG and print "<$x> and <$y> compared...\n";
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Consideration:
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while(length $x and length $y) {
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DEBUG > 2 and print " <$x> and <$y>...\n";
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# First, non-numeric comparison:
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$x2 = ($x =~ m/^(\D+)/s) ? length($1) : 0;
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$y2 = ($y =~ m/^(\D+)/s) ? length($1) : 0;
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# Now make x2 the min length of the two:
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$x2 = $y2 if $x2 > $y2;
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if($x2) {
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DEBUG > 1 and printf " <%s> and <%s> lexically for length $x2...\n",
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substr($x,0,$x2), substr($y,0,$x2);
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do {
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my $i = substr($x,0,$x2);
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my $j = substr($y,0,$x2);
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my $sv = $i cmp $j;
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print "SCREAM! on <$i><$j> -- $sv != $rv \n" unless $rv == $sv;
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last;
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}
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if $rv =
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# The ''. things here force a copy that seems to work around a
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# mysterious intermittent bug that 'use locale' provokes in
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# many versions of Perl.
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$cmp
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? $cmp->(substr($x,0,$x2) . '',
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substr($y,0,$x2) . '',
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)
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:
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scalar(( substr($x,0,$x2) . '' ) cmp
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( substr($y,0,$x2) . '' )
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)
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;
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# otherwise trim and keep going:
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substr($x,0,$x2) = '';
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substr($y,0,$x2) = '';
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}
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# Now numeric:
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# (actually just using $x2 and $y2 as scratch)
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if( $x =~ s/^(\d+)//s ) {
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$x2 = $1;
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if( $y =~ s/^(\d+)//s ) {
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# We have two numbers here.
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DEBUG > 1 and print " <$x2> and <$1> numerically\n";
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if(length($x2) < MAX_INT_SIZE and length($1) < MAX_INT_SIZE) {
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# small numbers: we can compare happily
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last if $rv = $x2 <=> $1;
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} else {
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# ARBITRARILY large integers!
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# This saves on loss of precision that could happen
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# with actual stringification.
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# Also, I sense that very large numbers aren't too
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# terribly common in sort data.
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# trim leading 0's:
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($y2 = $1) =~ s/^0+//s;
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$x2 =~ s/^0+//s;
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print " Treating $x2 and $y2 as bigint\n" if DEBUG;
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no locale; # we want the dumb cmp back.
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last if $rv = (
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# works only for non-negative whole numbers:
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length($x2) <=> length($y2)
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# the longer the numeral, the larger the value
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or $x2 cmp $y2
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# between equals, compare lexically!! amazing but true.
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);
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}
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} else {
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# X is numeric but Y isn't
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$rv = Y_FIRST;
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last;
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}
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} elsif( $y =~ s/^\d+//s ) { # we don't need to capture the substring
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$rv = X_FIRST;
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last;
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}
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# else one of them is 0-length.
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# end-while
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}
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}
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EOGUTS
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sub maker {
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my $code = $_[0];
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$code =~ s/~COMPARATOR~/$guts/g || die "Can't find ~COMPARATOR~";
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eval $code;
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die $@ if $@;
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}
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##############################################################################
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maker(<<'EONSORT');
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sub nsort {
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# get options:
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my($cmp, $lc);
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($cmp,$lc) = @{shift @_} if @_ and ref($_[0]) eq 'ARRAY';
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return @_ unless @_ > 1 or wantarray; # be clever
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my($x, $x2, $y, $y2, $rv); # scratch vars
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# We use a Schwartzian xform to memoize the lc'ing and \W-removal
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map $_->[0],
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sort {
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if($a->[0] eq $b->[0]) { 0 } # trap this expensive case
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else {
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$x = $a->[1];
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$y = $b->[1];
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~COMPARATOR~
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# Tiebreakers...
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DEBUG > 1 and print " -<${$a}[0]> cmp <${$b}[0]> is $rv ($ORD[$rv])\n";
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$rv ||= (length($x) <=> length($y)) # shorter is always first
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|| ($cmp and $cmp->($x,$y) || $cmp->($a->[0], $b->[0]))
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|| ($x cmp $y )
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|| ($a->[0] cmp $b->[0])
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;
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DEBUG > 1 and print " <${$a}[0]> cmp <${$b}[0]> is $rv ($ORD[$rv])\n";
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$rv;
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}}
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map {;
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$x = $lc ? $lc->($_) : lc($_); # x as scratch
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$x =~ s/\W+//s;
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[$_, $x];
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}
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@_
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}
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EONSORT
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#-----------------------------------------------------------------------------
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maker(<<'EONCMP');
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sub ncmp {
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# The guts are basically the same as above...
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# get options:
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my($cmp, $lc);
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($cmp,$lc) = @{shift @_} if @_ and ref($_[0]) eq 'ARRAY';
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if(@_ == 0) {
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@_ = ($a, $b); # bit of a hack!
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DEBUG > 1 and print "Hacking in <$a><$b>\n";
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} elsif(@_ != 2) {
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require Carp;
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Carp::croak("Not enough options to ncmp!");
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}
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my($a,$b) = @_;
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my($x, $x2, $y, $y2, $rv); # scratch vars
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DEBUG > 1 and print "ncmp args <$a><$b>\n";
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if($a eq $b) { # trap this expensive case
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0;
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} else {
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$x = ($lc ? $lc->($a) : lc($a));
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$x =~ s/\W+//s;
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$y = ($lc ? $lc->($b) : lc($b));
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$y =~ s/\W+//s;
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~COMPARATOR~
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# Tiebreakers...
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DEBUG > 1 and print " -<$a> cmp <$b> is $rv ($ORD[$rv])\n";
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$rv ||= (length($x) <=> length($y)) # shorter is always first
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|| ($cmp and $cmp->($x,$y) || $cmp->($a,$b))
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|| ($x cmp $y)
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|| ($a cmp $b)
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;
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DEBUG > 1 and print " <$a> cmp <$b> is $rv\n";
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$rv;
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}
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}
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EONCMP
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# clean up:
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undef $guts;
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undef &maker;
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#-----------------------------------------------------------------------------
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1;
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############### END OF MAIN SOURCE ###########################################
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__END__
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=head1 NAME
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Sort::Naturally -- sort lexically, but sort numeral parts numerically
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=head1 SYNOPSIS
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@them = nsort(qw(
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foo12a foo12z foo13a foo 14 9x foo12 fooa foolio Foolio Foo12a
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));
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print join(' ', @them), "\n";
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Prints:
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9x 14 foo fooa foolio Foolio foo12 foo12a Foo12a foo12z foo13a
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(Or "foo12a" + "Foo12a" and "foolio" + "Foolio" and might be
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switched, depending on your locale.)
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=head1 DESCRIPTION
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This module exports two functions, C<nsort> and C<ncmp>; they are used
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in implementing my idea of a "natural sorting" algorithm. Under natural
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sorting, numeric substrings are compared numerically, and other
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word-characters are compared lexically.
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This is the way I define natural sorting:
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=over
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=item *
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Non-numeric word-character substrings are sorted lexically,
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case-insensitively: "Foo" comes between "fish" and "fowl".
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=item *
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Numeric substrings are sorted numerically:
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"100" comes after "20", not before.
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=item *
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\W substrings (neither words-characters nor digits) are I<ignored>.
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=item *
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Our use of \w, \d, \D, and \W is locale-sensitive: Sort::Naturally
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uses a C<use locale> statement.
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=item *
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When comparing two strings, where a numeric substring in one
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place is I<not> up against a numeric substring in another,
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the non-numeric always comes first. This is fudged by
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reading pretending that the lack of a number substring has
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the value -1, like so:
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foo => "foo", -1
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foobar => "foo", -1, "bar"
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foo13 => "foo", 13,
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foo13xyz => "foo", 13, "xyz"
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That's so that "foo" will come before "foo13", which will come
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before "foobar".
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=item *
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The start of a string is exceptional: leading non-\W (non-word,
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non-digit)
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components are are ignored, and numbers come I<before> letters.
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=item *
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I define "numeric substring" just as sequences matching m/\d+/ --
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scientific notation, commas, decimals, etc., are not seen. If
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your data has thousands separators in numbers
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("20,000 Leagues Under The Sea" or "20.000 lieues sous les mers"),
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consider stripping them before feeding them to C<nsort> or
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C<ncmp>.
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=back
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=head2 The nsort function
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This function takes a list of strings, and returns a copy of the list,
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sorted.
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This is what most people will want to use:
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@stuff = nsort(...list...);
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When nsort needs to compare non-numeric substrings, it
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uses Perl's C<lc> function in scope of a <use locale>.
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And when nsort needs to lowercase things, it uses Perl's
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C<lc> function in scope of a <use locale>. If you want nsort
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to use other functions instead, you can specify them in
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an arrayref as the first argument to nsort:
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@stuff = nsort( [
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\&string_comparator, # optional
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\&lowercaser_function # optional
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],
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...list...
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);
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If you want to specify a string comparator but no lowercaser,
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then the options list is C<[\&comparator, '']> or
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C<[\&comparator]>. If you want to specify no string comparator
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but a lowercaser, then the options list is
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C<['', \&lowercaser]>.
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Any comparator you specify is called as
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C<$comparator-E<gt>($left, $right)>,
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and, like a normal Perl C<cmp> replacement, must return
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-1, 0, or 1 depending on whether the left argument is stringwise
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less than, equal to, or greater than the right argument.
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Any lowercaser function you specify is called as
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C<$lowercased = $lowercaser-E<gt>($original)>. The routine
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must not modify its C<$_[0]>.
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=head2 The ncmp function
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Often, when sorting non-string values like this:
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@objects_sorted = sort { $a->tag cmp $b->tag } @objects;
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...or even in a Schwartzian transform, like this:
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@strings =
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map $_->[0]
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sort { $a->[1] cmp $b->[1] }
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map { [$_, make_a_sort_key_from($_) ]
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@_
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;
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...you wight want something that replaces not C<sort>, but C<cmp>.
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That's what Sort::Naturally's C<ncmp> function is for. Call it with
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the syntax C<ncmp($left,$right)> instead of C<$left cmp $right>,
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but otherwise it's a fine replacement:
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@objects_sorted = sort { ncmp($a->tag,$b->tag) } @objects;
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@strings =
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map $_->[0]
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sort { ncmp($a->[1], $b->[1]) }
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map { [$_, make_a_sort_key_from($_) ]
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@_
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;
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Just as with C<nsort> can take different a string-comparator
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and/or lowercaser, you can do the same with C<ncmp>, by passing
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an arrayref as the first argument:
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ncmp( [
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\&string_comparator, # optional
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\&lowercaser_function # optional
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],
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$left, $right
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)
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You might get string comparators from L<Sort::ArbBiLex|Sort::ArbBiLex>.
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=head1 NOTES
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=over
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=item *
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This module is not a substitute for
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L<Sort::Versions|Sort::Versions>! If
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you just need proper version sorting, use I<that!>
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=item *
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If you need something that works I<sort of> like this module's
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functions, but not quite the same, consider scouting thru this
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module's source code, and adapting what you see. Besides
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the functions that actually compile in this module, after the POD,
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there's several alternate attempts of mine at natural sorting
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routines, which are not compiled as part of the module, but which you
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might find useful. They should all be I<working> implementations of
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slightly different algorithms
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(all of them based on Martin Pool's C<nsort>) which I eventually
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discarded in favor of my algorithm. If you are having to
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naturally-sort I<very large> data sets, and sorting is getting
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ridiculously slow, you might consider trying one of those
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discarded functions -- I have a feeling they might be faster on
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large data sets. Benchmark them on your data and see. (Unless
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you I<need> the speed, don't bother. Hint: substitute C<sort>
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for C<nsort> in your code, and unless your program speeds up
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drastically, it's not the sorting that's slowing things down.
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But if it I<is> C<nsort> that's slowing things down, consider
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just:
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if(@set >= SOME_VERY_BIG_NUMBER) {
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no locale; # vroom vroom
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@sorted = sort(@set); # feh, good enough
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} elsif(@set >= SOME_BIG_NUMBER) {
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use locale;
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@sorted = sort(@set); # feh, good enough
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} else {
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# but keep it pretty for normal cases
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@sorted = nsort(@set);
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}
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=item *
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If you do adapt the routines in this module, email me; I'd
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just be interested in hearing about it.
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=item *
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Thanks to the EFNet #perl people for encouraging this module,
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especially magister and a-mused.
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=back
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=head1 COPYRIGHT AND DISCLAIMER
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Copyright 2001, Sean M. Burke C<sburke@cpan.org>, all rights
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reserved. This program is free software; you can redistribute it
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and/or modify it under the same terms as Perl itself.
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This program is distributed in the hope that it will be useful, but
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without any warranty; without even the implied warranty of
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merchantability or fitness for a particular purpose.
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=head1 AUTHOR
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Sean M. Burke C<sburke@cpan.org>
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=cut
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############ END OF DOCS ############
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############################################################################
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############################################################################
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############ BEGIN OLD STUFF ############
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# We can't have "use integer;", or else (5 <=> 5.1) comes out "0" !
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#-----------------------------------------------------------------------------
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sub nsort {
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my($cmp, $lc);
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return @_ if @_ < 2; # Just to be CLEVER.
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my($x, $i); # scratch vars
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# And now, the GREAT BIG Schwartzian transform:
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map
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$_->[0],
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sort {
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# Uses $i as the index variable, $x as the result.
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$x = 0;
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$i = 1;
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DEBUG and print "\nComparing ", map("{$_}", @$a),
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' : ', map("{$_}", @$b), , "...\n";
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while($i < @$a and $i < @$b) {
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DEBUG and print " comparing $i: {$a->[$i]} cmp {$b->[$i]} => ",
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$a->[$i] cmp $b->[$i], "\n";
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last if ($x = ($a->[$i] cmp $b->[$i])); # lexicographic
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++$i;
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DEBUG and print " comparing $i: {$a->[$i]} <=> {$b->[$i]} => ",
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$a->[$i] <=> $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] <=> $b->[$i])); # numeric
|
|
++$i;
|
|
}
|
|
|
|
DEBUG and print "{$a->[0]} : {$b->[0]} is ",
|
|
$x || (@$a <=> @$b) || 0
|
|
,"\n"
|
|
;
|
|
$x || (@$a <=> @$b) || ($a->[0] cmp $b->[0]);
|
|
# unless we found a result for $x in the while loop,
|
|
# use length as a tiebreaker, otherwise use cmp
|
|
# on the original string as a fallback tiebreaker.
|
|
}
|
|
|
|
map {
|
|
my @bit = ($x = defined($_) ? $_ : '');
|
|
|
|
if($x =~ m/^[+-]?(?=\d|\.\d)\d*(?:\.\d*)?(?:[Ee](?:[+-]?\d+))?\z/s) {
|
|
# It's entirely purely numeric, so treat it specially:
|
|
push @bit, '', $x;
|
|
} else {
|
|
# Consume the string.
|
|
while(length $x) {
|
|
push @bit, ($x =~ s/^(\D+)//s) ? lc($1) : '';
|
|
push @bit, ($x =~ s/^(\d+)//s) ? $1 : 0;
|
|
}
|
|
}
|
|
DEBUG and print "$bit[0] => ", map("{$_} ", @bit), "\n";
|
|
|
|
# End result: [original bit , (text, number), (text, number), ...]
|
|
# Minimally: [0-length original bit,]
|
|
# Examples:
|
|
# ['10' => '' , 10, ]
|
|
# ['fo900' => 'fo' , 900, ]
|
|
# ['foo10' => 'foo', 10, ]
|
|
# ['foo9.pl' => 'foo', 9, , '.pl', 0 ]
|
|
# ['foo32.pl' => 'foo', 32, , '.pl', 0 ]
|
|
# ['foo325.pl' => 'foo', 325, , '.pl', 0 ]
|
|
# Yes, always an ODD number of elements.
|
|
|
|
\@bit;
|
|
}
|
|
@_;
|
|
}
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Same as before, except without the pure-number trap.
|
|
|
|
sub nsorts {
|
|
return @_ if @_ < 2; # Just to be CLEVER.
|
|
|
|
my($x, $i); # scratch vars
|
|
|
|
# And now, the GREAT BIG Schwartzian transform:
|
|
|
|
map
|
|
$_->[0],
|
|
|
|
sort {
|
|
# Uses $i as the index variable, $x as the result.
|
|
$x = 0;
|
|
$i = 1;
|
|
DEBUG and print "\nComparing ", map("{$_}", @$a),
|
|
' : ', map("{$_}", @$b), , "...\n";
|
|
|
|
while($i < @$a and $i < @$b) {
|
|
DEBUG and print " comparing $i: {$a->[$i]} cmp {$b->[$i]} => ",
|
|
$a->[$i] cmp $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] cmp $b->[$i])); # lexicographic
|
|
++$i;
|
|
|
|
DEBUG and print " comparing $i: {$a->[$i]} <=> {$b->[$i]} => ",
|
|
$a->[$i] <=> $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] <=> $b->[$i])); # numeric
|
|
++$i;
|
|
}
|
|
|
|
DEBUG and print "{$a->[0]} : {$b->[0]} is ",
|
|
$x || (@$a <=> @$b) || 0
|
|
,"\n"
|
|
;
|
|
$x || (@$a <=> @$b) || ($a->[0] cmp $b->[0]);
|
|
# unless we found a result for $x in the while loop,
|
|
# use length as a tiebreaker, otherwise use cmp
|
|
# on the original string as a fallback tiebreaker.
|
|
}
|
|
|
|
map {
|
|
my @bit = ($x = defined($_) ? $_ : '');
|
|
|
|
while(length $x) {
|
|
push @bit, ($x =~ s/^(\D+)//s) ? lc($1) : '';
|
|
push @bit, ($x =~ s/^(\d+)//s) ? $1 : 0;
|
|
}
|
|
DEBUG and print "$bit[0] => ", map("{$_} ", @bit), "\n";
|
|
|
|
# End result: [original bit , (text, number), (text, number), ...]
|
|
# Minimally: [0-length original bit,]
|
|
# Examples:
|
|
# ['10' => '' , 10, ]
|
|
# ['fo900' => 'fo' , 900, ]
|
|
# ['foo10' => 'foo', 10, ]
|
|
# ['foo9.pl' => 'foo', 9, , '.pl', 0 ]
|
|
# ['foo32.pl' => 'foo', 32, , '.pl', 0 ]
|
|
# ['foo325.pl' => 'foo', 325, , '.pl', 0 ]
|
|
# Yes, always an ODD number of elements.
|
|
|
|
\@bit;
|
|
}
|
|
@_;
|
|
}
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Same as before, except for the sort-key-making
|
|
|
|
sub nsort0 {
|
|
return @_ if @_ < 2; # Just to be CLEVER.
|
|
|
|
my($x, $i); # scratch vars
|
|
|
|
# And now, the GREAT BIG Schwartzian transform:
|
|
|
|
map
|
|
$_->[0],
|
|
|
|
sort {
|
|
# Uses $i as the index variable, $x as the result.
|
|
$x = 0;
|
|
$i = 1;
|
|
DEBUG and print "\nComparing ", map("{$_}", @$a),
|
|
' : ', map("{$_}", @$b), , "...\n";
|
|
|
|
while($i < @$a and $i < @$b) {
|
|
DEBUG and print " comparing $i: {$a->[$i]} cmp {$b->[$i]} => ",
|
|
$a->[$i] cmp $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] cmp $b->[$i])); # lexicographic
|
|
++$i;
|
|
|
|
DEBUG and print " comparing $i: {$a->[$i]} <=> {$b->[$i]} => ",
|
|
$a->[$i] <=> $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] <=> $b->[$i])); # numeric
|
|
++$i;
|
|
}
|
|
|
|
DEBUG and print "{$a->[0]} : {$b->[0]} is ",
|
|
$x || (@$a <=> @$b) || 0
|
|
,"\n"
|
|
;
|
|
$x || (@$a <=> @$b) || ($a->[0] cmp $b->[0]);
|
|
# unless we found a result for $x in the while loop,
|
|
# use length as a tiebreaker, otherwise use cmp
|
|
# on the original string as a fallback tiebreaker.
|
|
}
|
|
|
|
map {
|
|
my @bit = ($x = defined($_) ? $_ : '');
|
|
|
|
if($x =~ m/^[+-]?(?=\d|\.\d)\d*(?:\.\d*)?(?:[Ee](?:[+-]?\d+))?\z/s) {
|
|
# It's entirely purely numeric, so treat it specially:
|
|
push @bit, '', $x;
|
|
} else {
|
|
# Consume the string.
|
|
while(length $x) {
|
|
push @bit, ($x =~ s/^(\D+)//s) ? lc($1) : '';
|
|
# Secret sauce:
|
|
if($x =~ s/^(\d+)//s) {
|
|
if(substr($1,0,1) eq '0' and $1 != 0) {
|
|
push @bit, $1 / (10 ** length($1));
|
|
} else {
|
|
push @bit, $1;
|
|
}
|
|
} else {
|
|
push @bit, 0;
|
|
}
|
|
}
|
|
}
|
|
DEBUG and print "$bit[0] => ", map("{$_} ", @bit), "\n";
|
|
|
|
\@bit;
|
|
}
|
|
@_;
|
|
}
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Like nsort0, but WITHOUT pure number handling, and WITH special treatment
|
|
# of pulling off extensions and version numbers.
|
|
|
|
sub nsortf {
|
|
return @_ if @_ < 2; # Just to be CLEVER.
|
|
|
|
my($x, $i); # scratch vars
|
|
|
|
# And now, the GREAT BIG Schwartzian transform:
|
|
|
|
map
|
|
$_->[0],
|
|
|
|
sort {
|
|
# Uses $i as the index variable, $x as the result.
|
|
$x = 0;
|
|
$i = 3;
|
|
DEBUG and print "\nComparing ", map("{$_}", @$a),
|
|
' : ', map("{$_}", @$b), , "...\n";
|
|
|
|
while($i < @$a and $i < @$b) {
|
|
DEBUG and print " comparing $i: {$a->[$i]} cmp {$b->[$i]} => ",
|
|
$a->[$i] cmp $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] cmp $b->[$i])); # lexicographic
|
|
++$i;
|
|
|
|
DEBUG and print " comparing $i: {$a->[$i]} <=> {$b->[$i]} => ",
|
|
$a->[$i] <=> $b->[$i], "\n";
|
|
last if ($x = ($a->[$i] <=> $b->[$i])); # numeric
|
|
++$i;
|
|
}
|
|
|
|
DEBUG and print "{$a->[0]} : {$b->[0]} is ",
|
|
$x || (@$a <=> @$b) || 0
|
|
,"\n"
|
|
;
|
|
$x || (@$a <=> @$b ) || ($a->[1] cmp $b->[1])
|
|
|| ($a->[2] <=> $b->[2]) || ($a->[0] cmp $b->[0]);
|
|
# unless we found a result for $x in the while loop,
|
|
# use length as a tiebreaker, otherwise use the
|
|
# lc'd extension, otherwise the verison, otherwise use
|
|
# the original string as a fallback tiebreaker.
|
|
}
|
|
|
|
map {
|
|
my @bit = ( ($x = defined($_) ? $_ : ''), '',0 );
|
|
|
|
{
|
|
# Consume the string.
|
|
|
|
# First, pull off any VAX-style version
|
|
$bit[2] = $1 if $x =~ s/;(\d+)$//;
|
|
|
|
# Then pull off any apparent extension
|
|
if( $x !~ m/^\.+$/s and # don't mangle ".", "..", or "..."
|
|
$x =~ s/(\.[^\.\;]*)$//sg
|
|
# We could try to avoid catching all-digit extensions,
|
|
# but I think that's getting /too/ clever.
|
|
) {
|
|
$i = $1;
|
|
if($x =~ m<[^\\\://]$>s) {
|
|
# We didn't take the whole basename.
|
|
$bit[1] = lc $i;
|
|
DEBUG and print "Consuming extension \"$1\"\n";
|
|
} else {
|
|
# We DID take the whole basename. Fix it.
|
|
$x = $1; # Repair it.
|
|
}
|
|
}
|
|
|
|
push @bit, '', -1 if $x =~ m/^\./s;
|
|
# A hack to make .-initial filenames sort first, regardless of locale.
|
|
# And -1 is always a sort-firster, since in the code below, there's
|
|
# no allowance for filenames containing negative numbers: -1.dat
|
|
# will be read as string '-' followed by number 1.
|
|
|
|
while(length $x) {
|
|
push @bit, ($x =~ s/^(\D+)//s) ? lc($1) : '';
|
|
# Secret sauce:
|
|
if($x =~ s/^(\d+)//s) {
|
|
if(substr($1,0,1) eq '0' and $1 != 0) {
|
|
push @bit, $1 / (10 ** length($1));
|
|
} else {
|
|
push @bit, $1;
|
|
}
|
|
} else {
|
|
push @bit, 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
DEBUG and print "$bit[0] => ", map("{$_} ", @bit), "\n";
|
|
|
|
\@bit;
|
|
}
|
|
@_;
|
|
}
|
|
|
|
# yowza yowza yowza.
|
|
|