1 # Parse an L<> formatting code in POD text.
3 # This module implements parsing of the text of an L<> formatting code as
4 # defined in perlpodspec. It should be suitable for any POD formatter. It
5 # exports only one function, parselink(), which returns the five-item parse
6 # defined in perlpodspec.
8 # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl
10 ##############################################################################
11 # Modules and declarations
12 ##############################################################################
14 package Pod::ParseLink;
20 use vars qw(@EXPORT @ISA $VERSION);
24 @EXPORT = qw(parselink);
28 ##############################################################################
30 ##############################################################################
32 # Parse the name and section portion of a link into a name and section.
38 # If the whole link is enclosed in quotes, interpret it all as a section
39 # even if it contains a slash.
40 return (undef, $1) if ($link =~ /^"\s*(.*?)\s*"$/);
42 # Split into page and section on slash, and then clean up quoting in the
43 # section. If there is no section and the name contains spaces, also
44 # guess that it's an old section link.
45 my ($page, $section) = split (/\s*\/\s*/, $link, 2);
46 $section =~ s/^"\s*(.*?)\s*"$/$1/ if $section;
47 if ($page && $page =~ / / && !defined ($section)) {
51 $page = undef unless $page;
52 $section = undef unless $section;
54 return ($page, $section);
57 # Infer link text from the page and section.
59 my ($page, $section) = @_;
61 if ($page && !$section) {
63 } elsif (!$page && $section) {
64 $inferred = '"' . $section . '"';
65 } elsif ($page && $section) {
66 $inferred = '"' . $section . '" in ' . $page;
71 # Given the contents of an L<> formatting code, parse it into the link text,
72 # the possibly inferred link text, the name or URL, the section, and the type
73 # of link (pod, man, or url).
79 ($text, $link) = split (/\|/, $link, 2);
81 if ($link =~ /\A\w+:[^:\s]\S*\Z/) {
83 if (defined ($text) && length ($text) > 0) {
84 return ($text, $text, $link, undef, 'url');
86 return ($text, $link, $link, undef, 'url');
89 my ($name, $section) = _parse_section ($link);
91 if (defined ($text) && length ($text) > 0) {
94 $inferred = _infer_text ($name, $section);
96 my $type = ($name && $name =~ /\(\S*\)/) ? 'man' : 'pod';
97 return ($text, $inferred, $name, $section, $type);
101 ##############################################################################
102 # Module return value and documentation
103 ##############################################################################
105 # Ensure we evaluate to true.
114 Pod::ParseLink - Parse an LE<lt>E<gt> formatting code in POD text
119 my $link = get_link();
120 my ($text, $inferred, $name, $section, $type) = parselink($link);
124 This module only provides a single function, parselink(), which takes the
125 text of an LE<lt>E<gt> formatting code and parses it. It returns the
126 anchor text for the link (if any was given), the anchor text possibly
127 inferred from the name and section, the name or URL, the section if any,
128 and the type of link. The type will be one of C<url>, C<pod>, or C<man>,
129 indicating a URL, a link to a POD page, or a link to a Unix manual page.
131 Parsing is implemented per L<perlpodspec>. For backward compatibility,
132 links where there is no section and name contains spaces, or links where the
133 entirety of the link (except for the anchor text if given) is enclosed in
134 double-quotes are interpreted as links to a section (LE<lt>/sectionE<gt>).
136 The inferred anchor text is implemented per L<perlpodspec>:
138 L<name> => L<name|name>
139 L</section> => L<"section"|/section>
140 L<name/section> => L<"section" in name|name/section>
142 The name may contain embedded EE<lt>E<gt> and ZE<lt>E<gt> formatting codes,
143 and the section, anchor text, and inferred anchor text may contain any
144 formatting codes. Any double quotes around the section are removed as part
145 of the parsing, as is any leading or trailing whitespace.
147 If the text of the LE<lt>E<gt> escape is entirely enclosed in double
148 quotes, it's interpreted as a link to a section for backward
151 No attempt is made to resolve formatting codes. This must be done after
152 calling parselink() (since EE<lt>E<gt> formatting codes can be used to
153 escape characters that would otherwise be significant to the parser and
154 resolving them before parsing would result in an incorrect parse of a
155 formatting code like:
157 L<verticalE<verbar>barE<sol>slash>
159 which should be interpreted as a link to the C<vertical|bar/slash> POD page
160 and not as a link to the C<slash> section of the C<bar> POD page with an
161 anchor text of C<vertical>. Note that not only the anchor text will need to
162 have formatting codes expanded, but so will the target of the link (to deal
163 with EE<lt>E<gt> and ZE<lt>E<gt> formatting codes), and special handling of
164 the section may be necessary depending on whether the translator wants to
165 consider markup in sections to be significant when resolving links. See
166 L<perlpodspec> for more information.
170 Russ Allbery <rra@cpan.org>.
172 =head1 COPYRIGHT AND LICENSE
174 Copyright 2001, 2008, 2009, 2014, 2018 Russ Allbery <rra@cpan.org>
176 This program is free software; you may redistribute it and/or modify it
177 under the same terms as Perl itself.
183 The current version of this module is always available from its web site at
184 L<https://www.eyrie.org/~eagle/software/podlators/>.
189 # copyright-at-end-flag: t