/usr/share/perl5/String/Glob/Permute.pm is in libstring-glob-permute-perl 0.01-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# the contents of this file are licensed under the Perl Artistic License
# (ver. 15 Aug 1997).
###########################################
package String::Glob::Permute;
###########################################
use strict;
use warnings;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(string_glob_permute);
our $VERSION = "0.01";
###########################################
sub string_glob_permute {
###########################################
my( $string_glob ) = @_;
my @stringlist;
my @patterns = ($string_glob);
while (@patterns) {
my $h = shift(@patterns);
if ($h =~ /^(.*?)\[([^\]]+)\]([^,{[]*)(,(.*))?$/) {
my($pre,$post) = ($1,$3);
my @r = split(/,/,$2);
for (@r) {
if (/^(!?)(\d+)(-(\d+))?$/) {
my $lo = $2;
my $hi = $3 ? $4 : $lo;
my $fmt = "%d";
# Expand [09-11] to ("09", "10", "11") instead of
# ("9", "10", "11").
if (length($lo) == length($hi) && length($lo) > 1) {
$fmt = "%0" . length($lo) . "d";
}
for (my $n = $lo; $n <= $hi; $n++) {
my $hn = $pre . sprintf($fmt, $n) . $post;
if ($1) {
@stringlist = grep { $_ ne $hn } @stringlist;
@patterns = grep { $_ ne $hn } @patterns;
} else {
push(@patterns,$hn);
}
}
} else {
warn("Unrecognized host pattern: $h");
return undef;
}
}
if ($4) {
push(@patterns,$5);
}
} elsif ($h =~ /^(.*?)\{([^\}]+)\}([^,[{]*)(,(.*))?$/) {
my($pre,$post) = ($1,$3);
my @r = split(/,/,$2);
for (@r) {
push(@patterns,$pre.$_.$post);
}
if ($4) {
push(@patterns,$5);
}
} else {
my @h = split(/,/,$h);
push(@stringlist,@h);
}
}
return @stringlist;
}
1;
__END__
=head1 NAME
String::Glob::Permute - Expand {foo,bar,baz}[2-4] style string globs
=head1 SYNOPSIS
use String::Glob::Permute qw( string_glob_permute );
my $pattern = "host{foo,bar,baz}[2-4]";
for my $host (string_glob_permute( $pattern )) {
print "$host\n";
}
# hostfoo2
# hostbar2
# hostbaz2
# hostfoo3
# hostbar3
# hostbaz3
# hostfoo4
# hostbar4
# hostbaz4
=head1 DESCRIPTION
The C<string_glob_permute()> function provided by this module expands
glob-like notations in text strings and returns all possible permutations.
For example, to run a script on hosts host1, host2, and host3, you might
write
@hosts = string_glob_permute( "host[1-3]" );
and get a list of hosts back: ("host1", "host2", "host3").
Ranges with gaps are also supported, just separate the blocks by
commas:
@hosts = string_glob_permute( "host[1-3,5,9]" );
will return ("host1", "host2", "host3", "host5", "host9").
And, finally, using curly brackets and comma-separated lists of strings,
as in
@hosts = string_glob_permute( "host{dev,stag,prod}" );
you'll get permutations with each of the alternatives back:
("hostdev", "hoststag", "hostprod") back.
All of the above can be combined, so
my @hosts = string_glob_permute( "host{dev,stag}[3-4]" );
will result in the permutation
("hostdev3", "hoststag3", "hostdev4", "hoststag4").
The patterns allow numerical ranges only [1-3], no string ranges like
[a-z]. Pattern must not contain blanks.
The function returns a list of string permutations on success and
C<undef> in case of an error. A warning is also issued if the pattern
cannot be recognized.
=head2 Zero padding
An expression like
@hosts = string_glob_permute( "host[8-9,10]" );
# ("host8", "host9", "host10")
will expand to ("host8", "host9", "host10"), featuring no zero-padding to
create equal-length entries. If you want ("host08", "host09", "host10"),
instead, pad all integers in the range expression accordingly:
@hosts = string_glob_permute( "host[08-09,10]" );
# ("host08", "host09", "host10")
=head2 Note on Perl's internal Glob Permutations
Note that there's a little-known feature within Perl itself that does
something similar, for example
print "$_\n" for < foo{bar,baz} >;
will print
foobar
foobaz
if there is no file in the current directory that matches that pattern.
String::Glob::Permute, on the other hand, expands irrespective of matching
files, by simply always returning all possible permutations. It's also
worth noting that Perl's internal Glob Permutation does not support
String::Glob::Permute's [m,n] or [m-n] syntax.
=head1 COPYRIGHT & LICENSE
Copyright (c) 2008 Yahoo! Inc. All rights reserved. The copyrights to
the contents of this file are licensed under the Perl Artistic License
(ver. 15 Aug 1997).
=head1 AUTHOR
Algorithm, Code: Rick Reed, Ryan Hamilton, Greg Olszewski.
Module: 2008, Mike Schilli <cpan@perlmeister.com>
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