/usr/share/perl5/Set/Crontab.pm is in libset-crontab-perl 1.02-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | # Copyright 2001 Abhijit Menon-Sen <ams@toroid.org>
package Set::Crontab;
use strict;
use Carp;
use vars qw( $VERSION );
$VERSION = '1.02';
sub _expand
{
my (@list, @and, @not);
my ($self, $spec, $range) = @_;
# 1,2-4,*/3,!13,>9,<15
foreach (split /,/, $spec) {
my @pick;
my $step = $1 if s#/(\d+)$##;
# 0+"01" == 1
if (/^(\d+)$/) { push @pick, 0+$1; }
elsif (/^\*$/) { push @pick, @$range; }
elsif (/^(\d+)-(\d+)$/) { push @pick, 0+$1..0+$2; }
elsif (/^!(\d+)$/) { push @not, "\$_ != 0+$1"; }
elsif (/^([<>])(\d+)$/) { push @and, "\$_ $1 0+$2"; }
if ($step) {
my $i;
@pick = grep { defined $_ if $i++ % $step == 0 } @pick;
}
push @list, @pick;
}
if (@and) {
my $and = join q{ && }, @and;
push @list, grep { defined $_ if eval $and } @$range;
}
if (@not) {
my $not = join q{ && }, @not;
@list = grep { defined $_ if eval $not } (@list ? @list : @$range);
}
return \@list;
}
sub _initialise
{
my ($self, $spec, $range) = @_;
return undef unless ref($self);
croak "Usage: ".__PACKAGE__."->new(\$spec, [\@range])"
unless defined $spec && ref($range) eq "ARRAY";
$self->{LIST} = $self->_expand($spec, $range);
$self->{HASH} = {map {$_ => 1} @{$self->{LIST}}};
return $self;
};
sub new
{
my $class = shift;
my $self = bless {}, ref($class) || $class;
return $self->_initialise(@_);
}
sub contains
{
my ($self, $num) = @_;
croak "Usage: \$set->contains(\$num)" unless ref($self) && defined $num;
return exists $self->{HASH}{$num};
}
sub list
{
my $self = shift;
croak "Usage: \$set->list()" unless ref($self);
return @{$self->{LIST}};
}
1;
__END__
=head1 NAME
Set::Crontab - Expand crontab(5)-style integer lists
=head1 SYNOPSIS
$s = Set::Crontab->new("1-9/3,>15,>30,!23", [0..30]);
if ($s->contains(3)) { ... }
=head1 DESCRIPTION
Set::Crontab parses crontab-style lists of integers and defines some
utility functions to make it easier to deal with them.
=head2 Syntax
Numbers, ranges, *, and step values all work exactly as described in
L<crontab(5)>. A few extensions to the standard syntax are described
below.
=over 4
=item < and >
<N selects the elements smaller than N from the entire range, and adds
them to the set. >N does likewise for elements larger than N.
=item !
!N excludes N from the set. It applies to the other specified
range; otherwise it applies to the specified ranges (i.e. "!3" with a
range of "1-10" corresponds to "1-2,4-10", but ">3,!7" in the same range
means "4-6,8-10").
=back
=head2 Functions
=over 4
=item new($spec, [@range])
Creates a new Set::Crontab object and returns a reference to it.
=item contains($num)
Returns true if C<$num> exists in the set.
=item list()
Returns the expanded list corresponding to the set.
=back
The functions described above croak if they are called with incorrect
arguments.
=head1 SEE ALSO
L<crontab(5)>
=head1 AUTHOR
Abhijit Menon-Sen <ams@toroid.org>
Copyright 2001 Abhijit Menon-Sen <ams@toroid.org>
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
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