Bindings for the Snowball project's libstemmer. It implements the Porter stemmer algorithm and is in fact written by Dr Martin Porter himself making the implementation correct by defintion!
You need libstemmer itself as well as its headers to be able to install this egg.
- (available-stemmers) procedure
Returns a list of symbols identifying the available language stemmers.
- (make-stemmer language #!optional encoding) procedure
Returns a stemmer for the given language which must be a symbol contained in the list returned by available-stemmers. In addition an encoding string may be given. The current version of libstemmer supports "UTF_8", "ISO_8859_1", "CP850" and "KOI8_R". Since strings in Chicken are UTF-8 encoded, the default is "UTF_8".
- (stem stemmer word) procedure
Returns the stem of the given word according to the language algorithm given as stemmer which is a stemmer object as returned by make-stemmer. Note that this function isn't thread safe, so you either have to appropriately lock it or make sure that stemmer objects are thread local.
(use stemmer) (define german (make-stemmer 'german)) (stem german "Häuser") ; => "Haus"
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