1Text::Context::EitherSiUdsee(r3)Contributed Perl DocumenTteaxtti:o:nContext::EitherSide(3)
2
3
4

NAME

6       Text::Context::EitherSide - Get n words either side of search keywords
7

SYNOPSIS

9         use Text::Context::EitherSide;
10
11         my $text = "The quick brown fox jumped over the lazy dog";
12         my $context = Text::Context::EitherSide->new($text);
13
14         $context->as_string("fox") # "... quick brown fox jumped over ..."
15
16         $context->as_string("fox", "jumped")
17           # "... quick brown fox jumped over the ..."
18
19         my $context = Text::Context::EitherSide->new($text, context => 1);
20           # 1 word on either side
21
22         $context->as_string("fox", "jumped", "dog");
23           # "... brown fox jumped over ... lazy dog",
24
25       Or, if you don't believe in all this OO rubbish:
26
27         use Text::Context::EitherSide qw(get_context);
28         get_context(1, $text, "fox", "jumped", "dog")
29               # "... brown fox jumped over ... lazy dog"
30

DESCRIPTION

32       Suppose you have a large piece of text - typically, say, a web page or
33       a mail message. And now suppose you've done some kind of full-text
34       search on that text for a bunch of keywords, and you want to display
35       the context in which you found the keywords inside the body of the
36       text.
37
38       A simple-minded way to do that would be just to get the two words
39       either side of each keyword. But hey, don't be too simple minded,
40       because you've got to make sure that the list doesn't overlap. If you
41       have
42
43           the quick brown fox jumped over the lazy dog
44
45       and you extract two words either side of "fox", "jumped" and "dog", you
46       really don't want to end up with
47
48           quick brown fox jumped over brown fox jumped over the the lazy dog
49
50       so you need a small amount of smarts. This module has a small amount of
51       smarts.
52

EXPORTABLE

54   get_context
55       This is primarily an object-oriented module. If you don't care about
56       that, just import the "get_context" subroutine, and call it like so:
57
58           get_context($num_of_words, $text, @words_to_find)
59
60       and you'll get back a string with ellipses as in the synopsis. That's
61       all that most people need to know. But if you want to do clever
62       stuff...
63

METHODS

65   new
66           my $c = Text::Context::EitherSite->new($text [, context=> $n]);
67
68       Create a new object storing some text to be searched, plus optionally
69       some information about how many words on either side you want. (If you
70       don't like the default of 2.)
71
72   context
73           $c->context(5);
74
75       Allows you to get and set the number of the words on either side.
76
77   as_sparse_list
78           $c->as_sparse_list(@keywords)
79
80       Returns the keywords, plus n words on either side, as a sparse list;
81       the original text is split into an array of words, and non-contextual
82       elements are replaced with "undef"s. (That's not actually how it works,
83       but conceptually, it's the same.)
84
85   as_list
86           $c->as_list(@keywords)
87
88       The same as "as_sparse_list", but single or multiple "undef"s are
89       collapsed into a single ellipsis:
90
91           (undef, "foo", undef, undef, undef, "bar")
92
93       becomes
94
95           ("...", "foo", "...", "bar")
96
97   as_string
98           $c->as_string(@keywords)
99
100       Takes the "as_list" output above and joins them all together into a
101       string. This is what most people want from "Text::Context::EitherSide".
102
103   EXPORT
104       "get_context" is available as a shortcut for
105
106          Text::Context::EitherSide->new($text, context => $n)->as_string(@words);
107
108       but needs to be explicitly imported. Nothing is exported by default.
109

SEE ALSO

111       Text::Context is an even smarter way of extracting a contextual string.
112

AUTHOR

114       Current maintainer: Tony Bowden
115
116       Original author: Simon Cozens
117

BUGS and QUERIES

119       Please direct all correspondence regarding this module to:
120         bug-Text-Context-EitherSide@rt.cpan.org
121

123       Copyright 2002-2005 by Kasei Limited, http://www.kasei.com/
124
125       You may use and redistribute this module under the terms of the
126       Artistic License 2.0.
127
128       http://www.perlfoundation.org/artistic_license_2_0
129
130
131
132perl v5.30.1                      2020-01-30      Text::Context::EitherSide(3)
Impressum