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145 lines
4.4 KiB
Perl
145 lines
4.4 KiB
Perl
# File: Indefinite.pm
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#
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# Purpose: Implements a/an inflexion for nouns.
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package PBot::Core::Utils::Indefinite;
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use PBot::Imports;
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require Exporter;
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our @ISA = qw/Exporter/;
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our @EXPORT = qw/prepend_indefinite_article select_indefinite_article/;
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# This module implements A/AN inflexion for nouns...
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# Special cases of A/AN...
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my $ORDINAL_AN = qr{\A [aefhilmnorsx] -?th \Z}ix;
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my $ORDINAL_A = qr{\A [bcdgjkpqtuvwyz] -?th \Z}ix;
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my $EXPLICIT_AN = qr{\A (?: euler | hour(?!i) | heir | honest | hono )}ix;
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my $SINGLE_AN = qr{\A [aefhilmnorsx] \Z}ix;
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my $SINGLE_A = qr{\A [bcdgjkpqtuvwyz] \Z}ix;
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# This pattern matches strings of capitals (i.e. abbreviations) that
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# start with a "vowel-sound" consonant followed by another consonant,
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# and which are not likely to be real words
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# (oh, all right then, it's just magic!)...
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my $ABBREV_AN = qr{
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\A
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(?! FJO | [HLMNS]Y. | RY[EO] | SQU
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| ( F[LR]? | [HL] | MN? | N | RH? | S[CHKLMNPTVW]? | X(YL)?) [AEIOU]
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)
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[FHLMNRSX][A-Z]
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}xms;
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# This pattern codes the beginnings of all english words begining with a
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# 'Y' followed by a consonant. Any other Y-consonant prefix therefore
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# implies an abbreviation...
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my $INITIAL_Y_AN = qr{\A y (?: b[lor] | cl[ea] | fere | gg | p[ios] | rou | tt)}xi;
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sub prepend_indefinite_article {
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my ($word) = @_;
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return select_indefinite_article($word) . " $word";
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}
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sub select_indefinite_article {
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my ($word) = @_;
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# Handle ordinal forms...
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return "a" if $word =~ $ORDINAL_A;
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return "an" if $word =~ $ORDINAL_AN;
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# Handle special cases...
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return "an" if $word =~ $EXPLICIT_AN;
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return "an" if $word =~ $SINGLE_AN;
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return "a" if $word =~ $SINGLE_A;
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# Handle abbreviations...
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return "an" if $word =~ $ABBREV_AN;
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return "an" if $word =~ /\A [aefhilmnorsx][.-]/xi;
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return "a" if $word =~ /\A [a-z][.-]/xi;
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# Handle consonants
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return "a" if $word =~ /\A [^aeiouy] /xi;
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# Handle special vowel-forms
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return "a" if $word =~ /\A e [uw] /xi;
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return "a" if $word =~ /\A onc?e \b /xi;
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return "a" if $word =~ /\A uni (?: [^nmd] | mo) /xi;
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return "an" if $word =~ /\A ut[th] /xi;
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return "a" if $word =~ /\A u [bcfhjkqrst] [aeiou] /xi;
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# Handle special capitals
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return "a" if $word =~ /\A U [NK] [AIEO]? /x;
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# Handle vowels
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return "an" if $word =~ /\A [aeiou]/xi;
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# Handle Y... (before certain consonants implies (unnaturalized) "I.." sound)
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return "an" if $word =~ $INITIAL_Y_AN;
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# Otherwise, guess "A"
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return "a";
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}
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1; # Magic true value required at end of module
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__END__
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=head1 NAME
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Lingua::EN::Inflexion::Indefinite - Implements classes of LEI objects
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=head1 VERSION
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This document describes Lingua::EN::Inflexion::Indefinite version 0.000001
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=head1 DESCRIPTION
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This module contains implementation code only.
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See the documentation of Lingua::EN::Inflexion instead.
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=head1 AUTHOR
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Damian Conway C<< <DCONWAY@cpan.org> >>
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=head1 LICENCE AND COPYRIGHT
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Copyright (c) 2014, Damian Conway C<< <DCONWAY@cpan.org> >>. All rights reserved.
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This module is free software; you can redistribute it and/or
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modify it under the same terms as Perl itself. See L<perlartistic>.
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=head1 DISCLAIMER OF WARRANTY
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BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
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OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
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EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
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ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
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YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
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NECESSARY SERVICING, REPAIR, OR CORRECTION.
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
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REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE
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LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL,
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OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
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THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGES.
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