/usr/share/perl5/Lingua/EN/Inflect/Phrase.pm is in liblingua-en-inflect-phrase-perl 0.11-1.
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use strict;
use warnings;
use Exporter 'import';
use Lingua::EN::Inflect::Number;
use Lingua::EN::Tagger;
=head1 NAME
Lingua::EN::Inflect::Phrase - Inflect short English Phrases
=cut
our $VERSION = '0.11';
=head1 SYNOPSIS
use Lingua::EN::Inflect::Phrase;
use Test::More tests => 2;
my $plural = Lingua::EN::Inflect::Phrase::to_PL('green egg and ham');
is $plural, 'green eggs and ham';
my $singular = Lingua::EN::Inflect::Phrase::to_S('green eggs and ham');
is $singular, 'green egg and ham';
=head1 DESCRIPTION
Attempts to pluralize or singularize short English phrases.
If it doesn't work, please email or submit to RT the example you tried, and
I'll try to fix it.
=head1 OPTIONAL EXPORTS
L</to_PL>, L</to_S>
=cut
our @EXPORT_OK = qw/to_PL to_S/;
=head1 SUBROUTINES
=cut
my $NOUN = qr{(\S+)/NNS?\b};
my $MAYBE_NOUN = qr{(\S+)/(?:NNS?|CD|JJ)\b};
my $NOUN_OR_VERB = qr{(\S+)/(?:NNS?|CD|JJ|VB[A-Z]?)\b};
my $tagger;
sub _inflect_noun {
my ($noun, $is_plural, $want_plural, $inflect_method) = @_;
my $want_singular = not $want_plural;
if (($want_plural && (not $is_plural)) || ($want_singular && $is_plural)) {
return $noun->$inflect_method;
}
return undef;
}
sub _inflect {
my ($phrase, $want_plural, $method) = @_;
my $want_singular = not $want_plural;
# 'a' inflects to 'some', special-case it here
if ($phrase eq 'a') {
return $want_singular ? $phrase : 'as';
}
# Do not tag initial number, if any, unless it's "1" which is handled
# separately. Regex is from perldoc -q 'is a number'.
my ($number, $padding, $rest) =
$phrase =~ /^(\s*(?:[+-]?)(?=\d|\.\d)\d*(?:\.\d*)?(?:[Ee](?:[+-]?\d+))?)(\s*)(.*)$/;
my $tagged;
$tagger ||= Lingua::EN::Tagger->new;
if ($number && $number != 1) {
$tagged = $number . $padding . $tagger->get_readable($rest);
}
else {
$tagged = $tagger->get_readable($phrase);
}
my $force_singular = $tagged =~ m{
^ \s* (?:(?:a|the)/DET)?
\s* (?:1|one)/(?:JJ|NN|CD)\b
(?!\s* (?:\S+/CC\b | [0-9/]+/CD\b))
}x;
my ($noun, $tag);
# last noun (or verb that could be a noun) before a preposition/conjunction
# or last noun/verb
if ((($noun) = $tagged =~ m{$NOUN (?!.*/(?:NN|CD|JJ).*/(?:CC|IN)) .* /(?:CC|IN)}x) or
(($noun) = $tagged =~ m{$NOUN (?!.*/(?:NN|CD|JJ))}x) or
(($noun) = $tagged =~ m{$MAYBE_NOUN (?!.*/(?:NN|CD|JJ).*/(?:CC|IN)) .* /(?:CC|IN)}x) or
(($noun) = $tagged =~ m{$MAYBE_NOUN (?!.*/(?:NN|CD|JJ))}x) or
(($noun) = $tagged =~ m{$NOUN_OR_VERB (?!.*/(?:NN|CD|JJ|VB[A-Z]?).*/(?:CC|IN)) .* /(?:CC|IN)}x) or
(($noun) = $tagged =~ m{$NOUN_OR_VERB (?!.*/(?:NN|CD|JJ|VB[A-Z]?))}x)) {
my @pos = ($-[1], $+[1]);
my $inflected_noun;
# special case "belongs to" (and in the future, some other verbs)
if ($noun =~ /^(?:belongs)\z/i) {
return $phrase;
}
# special case phrases like "2 right braces" or "2 negative acknowledges"
# also we want "logs" to be treated as a noun usually
if ($noun =~ /^(?:right|negative)\z/i || $phrase =~ /\blogs\b/i) {
(($noun) = $tagged =~ m{$NOUN_OR_VERB (?!.*/(?:NN|CD|JJ|VB[A-Z]?).*/(?:CC|IN)) .* /(?:CC|IN)}x) or
(($noun) = $tagged =~ m{$NOUN_OR_VERB (?!.*/(?:NN|CD|JJ|VB[A-Z]?))}x);
@pos = ($-[1], $+[1]);
}
# fix "people" and "heroes"
if ($noun =~ /^(?:people|person)\z/i) {
$inflected_noun = $want_singular ? 'person' : 'people';
}
elsif ($noun =~ /^hero(?:es)?\z/i) {
$inflected_noun = $want_singular ? 'hero' : 'heroes';
}
elsif ($want_singular && lc($noun) eq 'aliases') {
$inflected_noun = 'alias';
}
elsif ($force_singular) {
$inflected_noun = Lingua::EN::Inflect::Number::to_S($noun);
}
else {
my $is_plural = Lingua::EN::Inflect::Number::number($noun) ne 's';
$inflected_noun = _inflect_noun($noun, $is_plural, $want_plural, $method);
}
substr($tagged, $pos[0], ($pos[1] - $pos[0])) = $inflected_noun if $inflected_noun;
($phrase = $tagged) =~ s{/[A-Z]+}{}g;
}
# fallback
else {
my $number = Lingua::EN::Inflect::Number::number($phrase);
if ($force_singular) {
$phrase = Lingua::EN::Inflect::Number::to_S($phrase);
}
elsif (($want_plural && $number ne 'p') || ($want_singular && $number ne 's')) {
$phrase = $phrase->$method;
}
}
return $phrase;
}
=head2 to_PL
Attempts to pluralizes a phrase unless already plural.
=cut
sub to_PL {
return _inflect(shift, 1, \&Lingua::EN::Inflect::Number::to_PL);
}
=head2 to_S
Attempts to singularize a phrase unless already singular.
=cut
sub to_S {
return _inflect(shift, 0, \&Lingua::EN::Inflect::Number::to_S);
}
=head1 BUGS
Please report any bugs or feature requests to C<bug-lingua-en-inflect-phrase at
rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Lingua-EN-Inflect-Phrase>. I
will be notified, and then you'll automatically be notified of progress on your
bug as I make changes.
=head1 SUPPORT
More information at:
=over 4
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Lingua-EN-Inflect-Phrase>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Lingua-EN-Inflect-Phrase>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Lingua-EN-Inflect-Phrase>
=item * Search CPAN
L<http://search.cpan.org/dist/Lingua-EN-Inflect-Phrase/>
=back
=head1 REPOSITORY
git clone git://github.com/rkitover/lingua-en-inflect-phrase.git lingua-en-inflect-phrase
=head1 SEE ALSO
L<Lingua::EN::Inflect>, L<Lingua::EN::Inflect::Number>, L<Lingua::EN::Tagger>
=head1 AUTHOR
Rafael Kitover <rkitover@cpan.org>
=head1 LICENSE AND COPYRIGHT
Copyright (c) 2010 Rafael Kitover (rkitover@cpan.org).
This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.
=cut
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