Contributions in other programming languages

This page is reserved for encodings of the snowball stemmers in other programming languages.

It must be emphasised that we are not in a position to maintain these submitted programs, or to guarantee their correctness. In the case of the Porter stemmer there have been 17 submissions in a variety of programming languages, and even though the stemmer itself is unchanging, they have created a certain amount of maintenance work. The Snowball site deals with a wide range of stemmers, all subject to occasional change, and the maintenance of other encodings is beyond our resources.

If you want to use one of these stemmers, we suggest you take the sample vocabulary for the corresponding natural language, and check that the stemmer produces the corresponding stemmed output. If it does not, bringing the submitted stemmer up-to-date should be easier than developing it from scratch.

At present we have only these submissions,

stemmer		language		author		affiliation		received		notes
Russian		php5		Dennis Kreminsky				11/2005		etranger at etranger dot ru
English		ANSI C		Martin		Snowball		01/2006
German		python		‘kristall’				05/2006		kristall (the ‘at’ sign) c-base.org
English		C#		Kamil Bartocha		www.pccentre.pl		04/2007		bug fix 12/2016 by Anna Tyurkina
Italian		C#		Luca Gentili				08/2008		luka.gentili[at]gmail[dot]com
English (porter2)		python		Michael Dirolf				09/2008		mike[at]dirolf[dot]com
Portuguese		java		Pedro Oliveira		University of Coimbra, Portugal		11/2008
English		Erlang		Frederick Ross		bbcf.epfl.ch/		01/2010		madhadron at gmail dot com
German		Javascript		Joder Illi		FormBlitz AG		07/2010		joderilli at gmail dot com
French		Javascript		Kasun Gajasinghe		Moratuwa University, Sri Lanka		08/2010		kasunbg at gmail dot com
English		matlab		Daniel Jablonski				09/2012		(exceptions not encoded)
English		C++		Sean Massung		University of Illinois		10/2012		for C++11, use GCC >= 4.7

Python versions of nearly all the stemmers have been made availabe by Peter Stahl (June 2010) at NLTK’s code repository. Peter also reports inaccuracies in the python German stemmer listed above.

Javascript versions of nearly all the stemmers have appeared in Oleg Mazko’s Urim project. Oleg created the stemmers by hand from the C/java output of the snowball compiler. Compare, for example, his Javascript version for Swedish with the original in C.

(As well as Oleg’s Russian stemmer, there is a Javascript Russian stemmer at code.google.com/p/js-lingua-stem-ru, created by Mark A. Prisyazhnyuk.)

C# versions of the stemmers were made available in August 2011 by of Iveonik Systems. They were ported from the Java Snowball stemmers.