DOKK / manpages / debian 12 / libtext-bibtex-perl / Text::BibTeX::NameFormat.3pm.en
Text::BibTeX::NameFormat(3pm) User Contributed Perl Documentation Text::BibTeX::NameFormat(3pm)

Text::BibTeX::NameFormat - format BibTeX-style author names

   use Text::BibTeX::NameFormat;
   $format = Text::BibTeX::NameFormat->($parts, $abbrev_first);
   $format->set_text ($part,
                      $pre_part, $post_part,
                      $pre_token, $post_token);
   $format->set_options ($part, $abbrev, $join_tokens, $join_part
   ## Uses the encoding/binmode and normalization form stored in $name
   $formatted_name = $format->apply ($name);

After splitting a name into its components parts (represented as a "Text::BibTeX::Name" object), you often want to put it back together again as a single string formatted in a consistent way. "Text::BibTeX::NameFormat" provides a very flexible way to do this, generally in two stages: first, you create a "name format" which describes how to put the tokens and parts of any name back together, and then you apply the format to a particular name.

The "name format" is encapsulated in a "Text::BibTeX::NameFormat" object. The constructor ("new") includes some clever behind-the-scenes trickery that means you can usually get away with calling it alone, and not need to do any customization of the format object. If you do need to customize the format, though, the "set_text()" and "set_options()" methods provide that capability.

Note that "Text::BibTeX::NameFormat" is a fairly direct translation of the name-formatting C interface in the btparse library. This manual page is meant to provide enough information to use the Perl class, but for more details and examples, consult bt_format_names.

Two enumerated types for dealing with names and name formatting have been brought from C into Perl. In the btparse documentation, you'll see references to "bt_namepart" and "bt_joinmethod". The former lists the four "parts" of a BibTeX name: first, von, last, and jr; its values (in both C and Perl) are "BTN_FIRST", "BTN_VON", "BTN_LAST", and "BTN_JR". The latter lists the ways in which "bt_format_name()" (the C function that corresponds to "Text::BibTeX::NameFormat"'s "apply" method) can join adjacent tokens together: "BTJ_MAYTIE", "BTJ_SPACE", "BTJ_FORCETIE", and "BTJ_NOTHING". Both sets of values may be imported from the "Text::BibTeX" module, using the import tags "nameparts" and "joinmethods". For instance:

   use Text::BibTeX qw(:nameparts :joinmethods);
   use Text::BibTeX::Name;
   use Text::BibTeX::NameFormat;

The "name part" constants are used to specify surrounding text or formatting options on a per-part basis: for instance, you can supply the "pre-token" text, or the "abbreviate" flag, for a single part without affecting other parts. The "join methods" are two of the three formatting options that you can set for a part: you can control how to join the individual tokens of a name ("JR Smith", or "J R Smith", or "J~R Smith", and you can control how the final token of one part is joined to the next part ("la Roche" versus "la~Roche").

Creates a new name format, with the two most common customizations: which parts to include (and in what order), and whether to abbreviate the first name. PARTS should be a string with at most four characters, one representing each part that you want to occur in a formatted name (defaults to "fvlj"). For example, "fvlj" means to format names in "first von last jr" order, while "vljf" denotes "von last jr first." ABBREV_FIRST is just a boolean value: false to print out the first name in full, and true to abbreviate it with periods after each token and discretionary ties between tokens (defaults to false). All intra- and inter-token punctuation and spacing is independently controllable with the "set_text" and "set_options" methods, although these will rarely be necessary---sensible defaults are chosen for everything, based on the PARTS and ABBREV_FIRST values that you supply. See the description of "bt_create_name_format()" in bt_format_names for full details of the choices made.
Allows you to customize some or all of the surrounding text for a single name part. Every name part has four possible chunks of text that go around or within it: before/after the part as a whole, and before/after each token in the part. For instance, if you are abbreviating first names and wish to control the punctuation after each token in the first name, you would set the "post token" text: 

   $format->set_text ('first', undef, undef, undef, '');

would set the post-token text to the empty string, resulting in names like "J R Smith". (Normally, abbreviated first names will have a period after each token: "J. R. Smith".) Note that supplying "undef" for the other three values leaves them unchanged.

See bt_format_names for full information on formatting names.

Allows further customization of a name format: you can set the abbreviation flag and the two token-join methods. Alas, there is no mechanism for leaving a value unchanged; you must set everything with "set_options".

For example, let's say that just dropping periods from abbreviated tokens in the first name isn't enough; you really want to save space by jamming the abbreviated tokens together: "JR Smith" rather than "J R Smith" Assuming the two calls in the above example have been done, the following will finish the job:

   $format->set_options (BTN_FIRST,
                         1,             # keep same value for abbrev flag
                         BTJ_NOTHING,   # jam tokens together
                         BTJ_SPACE);    # space after final token of part

Note that we unfortunately had to know (and supply) the current values for the abbreviation flag and post-part join method, even though we were only setting the intra-part join method.

Once a name format has been created and customized to your heart's content, you can use it to format any number of names using the "apply" method. NAME must be a "Text::BibTeX::Name" object (i.e., a pre-split name); "apply" returns a string containing the parts of the name formatted according to the "Text::BibTeX::NameFormat" structure it is called on.

Although the process of splitting and formatting names may sound complicated and convoluted from reading the above (along with Text::BibTeX::Name), it's actually quite simple. There are really only three steps to worry about: split the name (create a "Text::BibTeX::Name" object), create and customize the format ("Text::BibTeX::NameFormat" object), and apply the format to the name.

The first step is covered in Text::BibTeX::Name; here's a brief example:

   $orig_name = 'Charles Louis Xavier Joseph de la Vall{\'e}e Poussin';
   $name = Text::BibTeX::Name->new($orig_name);

The various parts of the name can now be accessed through "Text::BibTeX::Name" methods; for instance "$name->part('von')" returns the list "("de","la")".

Creating the name format is equally simple:

   $format = Text::BibTeX::NameFormat->new('vljf', 1);

creates a format that will print the name in "von last jr first" order, with the first name abbreviated. And for no extra charge, you get the right punctuation at the right place: a comma before any `jr' or `first' tokens, and periods after each `first' token.

For instance, we can perform no further customization on this format, and apply it immediately to $name. There are in fact two ways to do this, depending on whether you prefer to think of it in terms of "Applying the format to a name" or "formatting a name". The first is done with "Text::BibTeX::NameFormat"'s "apply" method:

   $formatted_name = $format->apply ($name);

while the second uses "Text::BibTeX::Name"'s "format" method:

   $formatted_name = $name->format ($format);

which is just a wrapper around "Text::BibTeX::NameFormat::apply". In either case, the result with the example name and format shown is

   de~la Vall{\'e}e~Poussin, C.~L. X.~J.

Note the strategic insertion of TeX "ties" (non-breakable spaces) at sensitive spots in the name. (The exact rules for insertion of discretionary ties are given in bt_format_names.)

Text::BibTeX::Entry, Text::BibTeX::Name, bt_format_names.

Greg Ward <gward@python.net>

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.

2023-01-30 perl v5.36.0