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Nick Patch

NAME

Lingua::Stem::Patch - Patch stemmers for Esperanto and Ido

VERSION

This document describes Lingua::Stem::Patch v0.06.

SYNOPSIS

    use Lingua::Stem::Patch;

    # create Esperanto stemmer
    $stemmer = Lingua::Stem::Patch->new(language => 'eo');

    # get stem for word
    $stem = $stemmer->stem($word);

    # get list of stems for list of words
    @stems = $stemmer->stem(@words);

DESCRIPTION

This module contains a collection of stemmers for multiple languages using the Patch stemming algorithms. The languages currently implemented are Esperanto, Ido, and Polish.

This is a new project under active development and the current stemming algorithms are likely to change.

Attributes

language

The following language codes are currently supported.

    ┌───────────┬────┐
    │ Esperanto │ eo │
    │ Ido       │ io │
    │ Polish    │ pl │
    └───────────┴────┘

They are in the two-letter ISO 639-1 format and are case-insensitive but are always returned in lowercase when requested.

    # instantiate a stemmer object
    $stemmer = Lingua::Stem::Patch->new(language => $language);

    # get current language
    $language = $stemmer->language;

    # change language
    $stemmer->language($language);
aggressive

By default a light stemmer will be used, but when aggressive is set to true, an aggressive stemmer will be used instead.

    $stemmer->aggressive(1);

Methods

stem

Accepts a list of words, stems each word, and returns a list of stems. The list returned will always have the same number of elements in the same order as the list provided. When no stemming rules apply to a word, the original word is returned.

    @stems = $stemmer->stem(@words);

    # get the stem for a single word
    $stem = $stemmer->stem($word);

The words should be provided as character strings and the stems are returned as character strings. Byte strings in arbitrary character encodings are intentionally not supported.

languages

Returns a list of supported two-letter language codes using lowercase letters.

    # object method
    @languages = $stemmer->languages;

    # class method
    @languages = Lingua::Stem::Patch->languages;

SEE ALSO

Lingua::Stem::Any provides a unified interface to any stemmer on CPAN, including this module, as well as additional features like normalization, casefolding, and in-place stemming.

AUTHOR

Nick Patch <patch@cpan.org>

COPYRIGHT AND LICENSE

© 2014–2015 Nick Patch

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.