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=head1 NAME

Lucy::Analysis::SnowballStopFilter - Suppress a "stoplist" of common words.

=head1 SYNOPSIS

    my $stopfilter = Lucy::Analysis::SnowballStopFilter->new(
        language => 'fr',
    );
    my $polyanalyzer = Lucy::Analysis::PolyAnalyzer->new(
        analyzers => [ $tokenizer, $normalizer, $stopfilter, $stemmer ],
    );



=head1 DESCRIPTION

A "stoplist" is collection of "stopwords": words which are common enough to
be of little value when determining search results.  For example, so many
documents in English contain "the", "if", and "maybe" that it may improve
both performance and relevance to block them.

Before filtering stopwords:

    ("i", "am", "the", "walrus")

After filtering stopwords:

    ("walrus")

SnowballStopFilter provides default stoplists for several languages, courtesy of
the Snowball project (<http://snowball.tartarus.org>), or you may supply
your own.

    |-----------------------|
    | ISO CODE | LANGUAGE   |
    |-----------------------|
    | da       | Danish     |
    | de       | German     |
    | en       | English    |
    | es       | Spanish    |
    | fi       | Finnish    |
    | fr       | French     |
    | hu       | Hungarian  |
    | it       | Italian    |
    | nl       | Dutch      |
    | no       | Norwegian  |
    | pt       | Portuguese |
    | sv       | Swedish    |
    | ru       | Russian    |
    |-----------------------|

=head1 CONSTRUCTORS

=head2 new( I<[labeled params]> )

    my $stopfilter = Lucy::Analysis::SnowballStopFilter->new(
        language => 'de',
    );
    
    # or...
    my $stopfilter = Lucy::Analysis::SnowballStopFilter->new(
        stoplist => \%stoplist,
    );

=over

=item *

B<stoplist> - A hash with stopwords as the keys.

=item *

B<language> - The ISO code for a supported language.

=back





=head1 INHERITANCE

Lucy::Analysis::SnowballStopFilter isa L<Lucy::Analysis::Analyzer> isa Clownfish::Obj.


=cut

