1Library::CallNumber::LCU(s3eprm)Contributed Perl DocumenLtiabtriaorny::CallNumber::LC(3pm)
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NAME

6       Library::CallNumber::LC - Deal with Library-of-Congress call numbers
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VERSION

9       Version 0.23;
10

SYNOPSIS

12       Utility functions to deal with Library of Congress Call Numbers
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14           use Library::CallNumber::LC;
15           my $a = Library::CallNumber::LC->new('A 123.4 .c11');
16           print $a->normalize; # normalizes for string comparisons.
17           # gives 'A01234 C11'
18           print $a->start_of_range; # same as "normalize"
19           my $b = Library::CallNumber::LC->new('B11 .c13 .d11');
20           print $b->normalize;
21           # gives 'B0011 C13 D11'
22           my @range = ($a->start_of_range, $b->end_of_range);
23           # end of range is 'B0011 C13 D11~'
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25           # Get components suitable for printing (e.g., number and decimal joined, leading dot on first cutter)
26           @comps = Library::CallNumber::LC->new('A 123.4 .c11')->components()
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28           # Same thing, but return empty strings for missing components (e.g., the cutters)
29           @comps = Library::CallNumber::LC->new('A 123.4 .c11')->components('true');
30

ABSTRACT

32       Library::CallNumber::LC is mostly designed to do call number
33       normalization, with the following goals:
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35       •   The normalized call numbers are comparable with each other, for
36           proper sorting
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38       •   The normalized call number is a short as possible, so left-anchored
39           wildcard searches are possible (e.g., searching on "A11*" should
40           give you all the A11 call numbers)
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42       •   A range defined by start_of_range and end_of_range should be
43           correct, assuming that the string given for the end of the range
44           is, in fact, a left prefix.
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46       That last point needs some explanation. The idea is that if someone
47       gives a range of, say, A-AZ, what they really mean is A - AZ9999.99.
48       The end_of_range method generates a key which lies immediately beyond
49       the last possible key for a given starting point. There is no attempt
50       to make end_of_range normalization correspond to anything in real life.
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CONSTRUCTORS

53   new([call_number_text, [topper_character, [bottomer_character]]]) -- create
54       a new object, optionally passing in the initial string, a "topper", and
55       a "bottomer" (explained below)

BASIC ACCESSORS

57   call_number([call_number_text])
58       The text of the call number we are dealing with.
59
60   topper([character])
61       Specify which character occupies the 'always-sort-to-the-top' slots in
62       the sort keys.  Defaults to the SPACE character, but can reasonably be
63       anything with an ASCII value lower than 48 (i.e. the 'zero' character,
64       '0').  This can function as either a class or instance method depending
65       on need.
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67   bottomer([character])
68       Specify which character occupies the 'always-sort-to-the-bottom' slots
69       in the sort keys.  Defaults to the TILDE character, but can reasonably
70       be anything with an ASCII value higher than 90 (i.e. 'Z').  This can
71       function as either a class or instance method depending on need.
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OTHER METHODS

74   components(boolean returnAll = false)
75         @comps = Library::CallNumber::LC->new('A 123.4 .c11')->components($returnAll)
76
77       Returns an array of the individual components of the call number (or
78       undef if it doesn't look like a call number).  Components are:
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80       •   alpha
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82       •   number (numeric.decimal)
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84       •   cutter1
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86       •   cutter2
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88       •   cutter3
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90       •   "extra" (anything after the cutters)
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92       The optional argument <I returnAll> (false by default) determines
93       whether or not empty components (e.g., extra cutters) get a slot in the
94       returned list.
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96   _normalize(call_number_text)
97       Base function to perform normalization.
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99   normalize([call_number_text])
100       Normalize the stored or passed call number as a sortable string
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102   start_of_range([call_number_text])
103       Alias for normalize
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105   end_of_range([call_number_text])
106       Downshift an lc number so it represents the end of a range
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108   toLongInt(call_number_text, num_digits)
109       Attempt to turn a call number into an integer value. Possibly useful
110       for fast range checks, although obviously not perfectly accurate.
111       Optional argument $num_digits can be used to control the number of
112       digits used, and therefore the precision of the results.
113

AUTHOR

115       Current Maintainer: Dan Wells, "<dbw2 at calvin.edu>" Original Author:
116       Bill Dueber, "<dueberb at umich.edu>"
117

BUGS

119       Please report any bugs or feature requests through the web interface at
120       <http://code.google.com/p/library-callnumber-lc/issues/list>.  I will
121       be notified, and then you'll automatically be notified of progress on
122       your bug as I make changes.
123

SUPPORT

125       You can find documentation for this module with the perldoc command.
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127           perldoc Library::CallNumber::LC
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129       You can also look for information at the Google Code page:
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131         http://code.google.com/p/library-callnumber-lc/
132

134       Copyright 2009 Bill Dueber, all rights reserved.  Copyright 2011 Dan
135       Wells, all rights reserved.
136
137       This program is free software; you can redistribute it and/or modify it
138       under the same terms as Perl itself and also under the new BSD license
139       as described at http://www.opensource.org/licenses/bsd-license.php
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143perl v5.38.0                      2023-07-20      Library::CallNumber::LC(3pm)
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