1Lingua::StopWords(3)  User Contributed Perl Documentation Lingua::StopWords(3)
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NAME

6       Lingua::StopWords - Stop words for several languages.
7

SYNOPSIS

9           use Lingua::StopWords qw( getStopWords );
10           my $stopwords = getStopWords('en');
11
12           my @words = qw( i am the walrus goo goo g'joob );
13
14           # prints "walrus goo goo g'joob"
15           print join ' ', grep { !$stopwords->{$_} } @words;
16

DESCRIPTION

18       In keyword search, it is common practice to suppress a collection of
19       "stopwords": words such as "the", "and", "maybe", etc. which exist in
20       in a large number of documents and do not tell you anything important
21       about any document which contains them.  This module provides such
22       "stoplists" in several languages.
23
24   Supported Languages
25           |-----------------------------------------------------------|
26           | Language   | ISO code | default encoding | also available |
27           |-----------------------------------------------------------|
28           | Danish     | da       | ISO-8859-1       | UTF-8          |
29           | Dutch      | nl       | ISO-8859-1       | UTF-8          |
30           | English    | en       | ISO-8859-1       | UTF-8          |
31           | Finnish    | fi       | ISO-8859-1       | UTF-8          |
32           | French     | fr       | ISO-8859-1       | UTF-8          |
33           | German     | de       | ISO-8859-1       | UTF-8          |
34           | Hungarian  | hu       | ISO-8859-1       | UTF-8          |
35           | Italian    | it       | ISO-8859-1       | UTF-8          |
36           | Norwegian  | no       | ISO-8859-1       | UTF-8          |
37           | Portuguese | pt       | ISO-8859-1       | UTF-8          |
38           | Spanish    | es       | ISO-8859-1       | UTF-8          |
39           | Swedish    | sv       | ISO-8859-1       | UTF-8          |
40           | Russian    | ru       | KOI8-R           | UTF-8          |
41           |-----------------------------------------------------------|
42

FUNCTIONS

44   getStopWords
45           my $stoplist      = getStopWords('en');
46           my $utf8_stoplist = getStopWords('en', 'UTF-8');
47
48       Retrieve a stoplist in the form of a hashref where the keys are all
49       stopwords and the values are all 1.
50
51           $stoplist = {
52               and => 1,
53               if  => 1,
54               # ...
55           };
56
57       getStopWords() expects 1-2 arguments.  The first, which is required, is
58       an ISO code representing a supported language.  If the ISO code cannot
59       be found, getStopWords returns undef.
60
61       The second argument should be 'UTF-8' if you want the stopwords encoded
62       in UTF-8.  The UTF-8 flag will be turned on, so make sure you
63       understand all the implications of that.
64

SEE ALSO

66       The stoplists supplied by this module were created as part of the
67       Snowball project (see <http://snowball.tartarus.org>,
68       Lingua::Stem::Snowball).
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70       Lingua::EN::StopWords provides a different stoplist for English.
71

AUTHOR

73       Maintained by Marvin Humphrey <marvin at rectangular dot com>.
74       Original author Fabien Potencier, <fabpot at cpan dot org>.
75

77       Copyright 2004-2008 Fabien Potencier, Marvin Humphrey
78
79       This library is free software; you can redistribute it and/or modify it
80       under the same terms as Perl itself, either Perl version 5.8.3 or, at
81       your option, any later version of Perl 5 you may have available.
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85perl v5.32.1                      2021-01-27              Lingua::StopWords(3)
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