/usr/lib/swi-prolog/library/snowball.pl is in swi-prolog-nox 7.6.4+dfsg-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2010-2015, VU University, Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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*/
:- module(snowball,
[ snowball/3, % +Algorithm, +In, -Out
snowball_current_algorithm/1 % ?algorithm
]).
:- use_module(library(sandbox)).
/** <module> The Snowball multi-lingual stemmer library
This module encapsulates "The C version of the libstemmer library" from
the Snowball project. This library provides stemmers in a variety of
languages. The interface to this library is very simple:
* snowball/3 stems a word with a given algorithm
* snowball_current_algorithm/1 enumerates the provided algorithms.
Here is an example:
==
?- snowball(english, walking, S).
S = walk.
==
@see http://snowball.tartarus.org/
*/
:- use_foreign_library(foreign(snowball)).
%! snowball(+Algorithm, +Input, -Stem) is det.
%
% Apply the Snowball Algorithm on Input and unify the result
% (an atom) with Stem.
%
% The implementation maintains a cache of stemmers for each thread
% that accesses snowball/3, providing high-perfomance and
% thread-safety without locking.
%
% @param Algorithm is the (english) name for desired algorithm
% or an 2 or 3 letter ISO 639 language code.
% @param Input is the word to be stemmed. It is either an
% atom, string or list of chars/codes. The library
% accepts Unicode characters. Input must be
% _lowercase_. See downcase_atom/2.
% @error domain_error(snowball_algorithm, Algorithm)
% @error type_error(atom, Algorithm)
% @error type_error(text, Input)
%! snowball_current_algorithm(?Algorithm) is nondet.
%
% True if Algorithm is the official name of an algorithm suported
% by snowball/3. The predicate is =semidet= if Algorithm is given.
term_expansion(snowball_current_algorithm(dummy), Clauses) :-
snowball_algorithms(Algos),
maplist(wrap, Algos, Clauses).
wrap(X, snowball_current_algorithm(X)).
snowball_current_algorithm(dummy).
:- multifile
sandbox:safe_primitive/1.
sandbox:safe_primitive(snowball:snowball(_,_,_)).
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