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 ‘Crow’ Bartocha		www.pccentre.pl		04/2007
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

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.