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|
#!perl
package Games::Word;
require Exporter;
@ISA = qw/Exporter/;
@EXPORT_OK = qw/random_word is_word set_word_list
random_permutation is_permutation/;
use strict;
use warnings;
use Math::Combinatorics qw/factorial/;
use Test::Deep::NoTest;
my $word_list = '';
my $cache = 1;
my %words = ();
my @words = ();
sub set_word_list {
$word_list = shift;
die "Can't read word list: $word_list" unless -r $word_list;
die "Empty word list: $word_list" unless -s $word_list;
my %args = (cache => 1, @_);
if ($args{cache}) {
open my $fh, $word_list or die "Opening $word_list failed";
for (<$fh>) {
chomp;
$words{$_} = 1;
}
@words = keys %words;
$cache = 1;
}
else {
$cache = 0;
}
}
sub _random_word_cache {
die "No words in word list" unless keys %words;
return $words[int(rand(@words))];
}
sub _random_word_nocache {
my $word;
open my $fh, '<', $word_list or die "Opening $word_list failed";
while (<$fh>) {
$word = $_ if int(rand($.)) == 0;
}
chomp $word;
return $word;
}
sub random_word {
return _random_word_cache if $cache;
return _random_word_nocache;
}
sub _is_word_cache {
return $words{$_[0]};
}
sub _is_word_nocache {
my $word = shift;
open my $fh, '<', $word_list
or die "Couldn't open word list: $word_list";
while (<$fh>) {
chomp;
return 1 if $_ eq $word;
}
return 0;
}
sub is_word {
return _is_word_cache(@_) if $cache;
return _is_word_nocache(@_);
}
sub random_permutation {
my $word = shift;
return '' if $word eq '';
use integer;
my $len = length $word;
my $perm_index = shift;
$perm_index = defined($perm_index) ? $perm_index :
int(rand(factorial($len)));
die "invalid permutation index" if $perm_index >= factorial($len) ||
$perm_index < 0;
my $current_index = $perm_index / factorial($len - 1);
my $rest = $perm_index % factorial($len - 1);
my $first_letter = substr($word, $current_index, 1);
substr($word, $current_index, 1) = '';
return $first_letter . random_permutation($word, $rest);
}
sub is_permutation {
my @word_letters = split //, shift;
my @perm_letters = split //, shift;
return eq_deeply(\@word_letters, bag(@perm_letters));
}
=head1 NAME
Games::Word - ???
=head1 VERSION
Version 0.01 released ???
=cut
our $VERSION = '0.01';
=head1 SYNOPSIS
use Games::Word;
do_stuff();
=head1 DESCRIPTION
=head1 SEE ALSO
L<Foo::Bar>
=head1 AUTHOR
Jesse Luehrs, C<< <jluehrs2 at uiuc.edu> >>
=head1 BUGS
No known bugs.
Please report any bugs through RT: email
C<bug-games-word at rt.cpan.org>, or browse
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Games-Word>.
=head1 SUPPORT
You can find this documentation for this module with the perldoc command.
perldoc Games::Word
You can also look for information at:
=over 4
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Games-Word>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Games-Word>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Games-Word>
=item * Search CPAN
L<http://search.cpan.org/dist/Games-Word>
=back
=head1 COPYRIGHT AND LICENSE
Copyright 2008 Jesse Luehrs.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
1;
|
