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package Lingua::EN::Number::IsOrdinal; |
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BEGIN { |
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$Lingua::EN::Number::IsOrdinal::AUTHORITY = 'cpan:AVAR'; |
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} |
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{ |
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$Lingua::EN::Number::IsOrdinal::VERSION = '0.04'; |
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} |
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use strict; |
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use warnings; |
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use Exporter 'import'; |
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use Lingua::EN::FindNumber 'extract_numbers'; |
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=encoding UTF-8 |
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=head1 NAME |
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Lingua::EN::Number::IsOrdinal - detect if English number is ordinal or cardinal |
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=head1 SYNOPSIS |
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use Lingua::EN::Number::IsOrdinal 'is_ordinal'; |
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ok is_ordinal('first'); |
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ok !is_ordinal('one'); |
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ok is_ordinal('2nd'); |
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ok !is_ordinal('2'); |
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=head1 DESCRIPTION |
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This module will tell you if a number, either in words or as digits, is a |
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cardinal or L<ordinal |
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number|http://www.ego4u.com/en/cram-up/vocabulary/numbers/ordinal>. |
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This is useful if you e.g. want to distinguish these types of numbers found with |
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L<Lingua::EN::FindNumber> and take different actions. |
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=cut |
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our @EXPORT_OK = qw/is_ordinal/; |
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my $ORDINAL_WORDS_NUMBER_RE = qr/(?:first|second|third|th)\s*$/; |
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my $NUMBER_RE = qr/^\s*(?:[+-]?)(?=\d|\.\d)\d*(?:\.\d*)?(?:[Ee](?:[+-]?\d+))?/; |
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my $CARDINAL_NUMBER_RE = qr/$NUMBER_RE\s*$/; |
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my $ORDINAL_NUMBER_RE = qr/$NUMBER_RE(?:st|nd|rd|th)\s*$/; |
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=head1 FUNCTIONS |
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=head2 is_ordinal |
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Takes a number as English words or digits (with or without ordinal suffix) and |
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returns C<1> for ordinal numbers and C<undef> for cardinal numbers. |
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Checks that the whole parameter is a number using L<Lingua::EN::FindNumber> or |
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a regex in the case of digits, and if it isn't will throw a C<not a number> |
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exception. |
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This function can be optionally imported. |
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=cut |
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sub is_ordinal { __PACKAGE__->_is_ordinal(@_) } |
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=head1 METHODS |
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=head2 _is_ordinal |
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Method version of L</is_ordinal>, this is where the function is actually |
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implemented. Can be overloaded in a subclass. |
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=cut |
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sub _is_ordinal { |
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my ($self, $num) = @_; |
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die "not a number" unless $self->_is_number($num); |
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if ($num =~ $ORDINAL_NUMBER_RE) { |
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return 1; |
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} |
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elsif ($num =~ $CARDINAL_NUMBER_RE) { |
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return undef; |
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} |
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elsif ($num =~ $ORDINAL_WORDS_NUMBER_RE) { |
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return 1; |
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} |
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return undef; # cardinal words-number |
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} |
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=head2 _is_number |
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Returns C<1> if the passed in string is a word-number as detected by |
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L<Lingua::EN::FindNumber> or is a cardinal or ordinal number made of digits and |
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(for ordinal numbers) a suffix. Otherwise returns C<undef>. Can be overloaded in |
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a subclass. |
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=cut |
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sub _is_number { |
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my ($self, $text) = @_; |
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s/^\s+//, s/\s+$// for $text; |
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my @nums = extract_numbers $text; |
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if ((@nums == 1 && $nums[0] eq $text) |
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|| $text =~ $ORDINAL_NUMBER_RE || $text =~ $CARDINAL_NUMBER_RE) { |
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return 1; |
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} |
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return undef; |
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} |
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=head1 SEE ALSO |
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=over 4 |
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=item * L<Lingua::EN::FindNumber> |
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=item * L<Lingua::EN::Words2Nums> |
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=item * L<Lingua::EN::Inflect::Phrase> |
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=back |
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=head1 AUTHOR |
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Rafael Kitover <rkitover@cpan.org> |
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=cut |
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1; |