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.IX Title "Text::BibTeX::BibSort 3pm"
.TH Text::BibTeX::BibSort 3pm 2024-09-01 "perl v5.40.0" "User Contributed Perl Documentation"
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.SH NAME
Text::BibTeX::BibSort \- generate sort keys for bibliographic entries
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 4
\&   # Assuming $entry comes from a database of the \*(AqBib\*(Aq structure
\&   # (i.e., that it\*(Aqs blessed into the BibEntry class, which inherits
\&   # the sort_key method from BibSort):
\&   $sort_key = $entry\->sort_key;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Text::BibTeX::BibSort\*(C'\fR is a base class of \f(CW\*(C`Text::BibTeX::BibEntry\*(C'\fR
for generating sort keys from bibliography entries.  It could in
principle (and, someday, might) offer a wide range of highly
customizable sort-key generators.  Currently, though, it provides only a
single method (\f(CW\*(C`sort_key\*(C'\fR) for public use, and that method only pays
attention to one structure option, \f(CW\*(C`sortby\*(C'\fR.
.SH METHODS
.IX Header "METHODS"
.IP "sort_key ()" 4
.IX Item "sort_key ()"
Generates a sort key for a single bibliographic entry.  Assumes this
entry conforms to the \f(CW\*(C`Bib\*(C'\fR database structure.  The nature of this
sort key is controlled by the \f(CW\*(C`sortby\*(C'\fR option, which can be either
\&\f(CW"name"\fR or \f(CW"year"\fR.  (The \f(CW\*(C`namestyle\*(C'\fR also has a role, in
determining how author/editor names are formatted for inclusion in the
sort key.)
.Sp
For by-name sorting (which is how BibTeX's standard styles work), the sort
key consists of one of the \f(CW\*(C`author\*(C'\fR, \f(CW\*(C`editor\*(C'\fR, \f(CW\*(C`organization\*(C'\fR, or \f(CW\*(C`key\*(C'\fR
fields (depending on the entry type and which fields are actually present),
followed by the year and the title.  All fields are drastically simplified
to produce the sort key: non-English letters are mercilessly anglicized,
non-alphabetic characters are stripped, and everything is forced to
lowercase.  (The first two steps are done by the \f(CW\*(C`purify_string\*(C'\fR routine;
see "Generic string-processing functions" in Text::BibTeX for a brief
description, and the description of the C function \f(CWbt_purify_string()\fR in
bt_misc for all the gory details.)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Text::BibTeX::Structure, Text::BibTeX::Bib,
Text::BibTeX::BibFormat
.SH AUTHOR
.IX Header "AUTHOR"
Greg Ward <gward@python.net>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 1997\-2000 by Gregory P. Ward.  All rights reserved.  This file
is part of the Text::BibTeX library.  This library is free software; you
may redistribute it and/or modify it under the same terms as Perl itself.