phpman > perldoc > Plucene::Analysis::PorterStemFilter(3pm)

NAME
    Plucene::Analysis::PorterStemFilter - Porter stemming on the token stream

SYNOPSIS
            # isa Plucene::Analysis:::TokenFilter

            my $token = $porter_stem_filter->next;

DESCRIPTION
    This class transforms the token stream as per the Porter stemming algorithm.

    Note: the input to the stemming filter must already be in lower case, so you will need to use
    LowerCaseFilter or LowerCaseTokenizer farther down the Tokenizer chain in order for this to work
    properly!

    The Porter Stemmer implements Porter Algorithm for normalization of English words by stripping
    their extensions and is used to generalize the searches. For example, the Porter algorithm maps
    both 'search' and 'searching' (as well as 'searchnessing') to 'search' such that a query for
    'search' will also match documents that contains the word 'searching'.

    Note that the Porter algorithm is specific to the English language and may give unpredictable
    results for other languages. Also, make sure to use the same analyzer during the indexing and
    the searching.

    You can find more information on the Porter algorithm at www.tartarus.org/~martin/PorterStemmer.

    A nice online demonstration of the Porter algorithm is available at
    www.scs.carleton.ca/~dquesnel/java/stuff/PorterApplet.html.

METHODS
  next
            my $token = $porter_stem_filter->next;

    Returns the next input token, after being stemmed.