1 # Pod::ParseLink -- Parse an L<> formatting code in POD text.
3 # Copyright 2001, 2008, 2009, 2014 by Russ Allbery <rra@cpan.org>
5 # This program is free software; you may redistribute it and/or modify it
6 # under the same terms as Perl itself.
8 # This module implements parsing of the text of an L<> formatting code as
9 # defined in perlpodspec. It should be suitable for any POD formatter. It
10 # exports only one function, parselink(), which returns the five-item parse
11 # defined in perlpodspec.
13 # Perl core hackers, please note that this module is also separately
14 # maintained outside of the Perl core as part of the podlators. Please send
15 # me any patches at the address above in addition to sending them to the
16 # standard Perl mailing lists.
18 ##############################################################################
19 # Modules and declarations
20 ##############################################################################
22 package Pod::ParseLink;
28 use vars qw(@EXPORT @ISA $VERSION);
32 @EXPORT = qw(parselink);
36 ##############################################################################
38 ##############################################################################
40 # Parse the name and section portion of a link into a name and section.
46 # If the whole link is enclosed in quotes, interpret it all as a section
47 # even if it contains a slash.
48 return (undef, $1) if ($link =~ /^"\s*(.*?)\s*"$/);
50 # Split into page and section on slash, and then clean up quoting in the
51 # section. If there is no section and the name contains spaces, also
52 # guess that it's an old section link.
53 my ($page, $section) = split (/\s*\/\s*/, $link, 2);
54 $section =~ s/^"\s*(.*?)\s*"$/$1/ if $section;
55 if ($page && $page =~ / / && !defined ($section)) {
59 $page = undef unless $page;
60 $section = undef unless $section;
62 return ($page, $section);
65 # Infer link text from the page and section.
67 my ($page, $section) = @_;
69 if ($page && !$section) {
71 } elsif (!$page && $section) {
72 $inferred = '"' . $section . '"';
73 } elsif ($page && $section) {
74 $inferred = '"' . $section . '" in ' . $page;
79 # Given the contents of an L<> formatting code, parse it into the link text,
80 # the possibly inferred link text, the name or URL, the section, and the type
81 # of link (pod, man, or url).
87 ($text, $link) = split (/\|/, $link, 2);
89 if ($link =~ /\A\w+:[^:\s]\S*\Z/) {
91 if (defined ($text) && length ($text) > 0) {
92 return ($text, $text, $link, undef, 'url');
94 return ($text, $link, $link, undef, 'url');
97 my ($name, $section) = _parse_section ($link);
99 if (defined ($text) && length ($text) > 0) {
102 $inferred = _infer_text ($name, $section);
104 my $type = ($name && $name =~ /\(\S*\)/) ? 'man' : 'pod';
105 return ($text, $inferred, $name, $section, $type);
109 ##############################################################################
110 # Module return value and documentation
111 ##############################################################################
113 # Ensure we evaluate to true.
119 Pod::ParseLink - Parse an LE<lt>E<gt> formatting code in POD text
127 my $link = get_link();
128 my ($text, $inferred, $name, $section, $type) = parselink($link);
132 This module only provides a single function, parselink(), which takes the
133 text of an LE<lt>E<gt> formatting code and parses it. It returns the
134 anchor text for the link (if any was given), the anchor text possibly
135 inferred from the name and section, the name or URL, the section if any,
136 and the type of link. The type will be one of C<url>, C<pod>, or C<man>,
137 indicating a URL, a link to a POD page, or a link to a Unix manual page.
139 Parsing is implemented per L<perlpodspec>. For backward compatibility,
140 links where there is no section and name contains spaces, or links where the
141 entirety of the link (except for the anchor text if given) is enclosed in
142 double-quotes are interpreted as links to a section (LE<lt>/sectionE<gt>).
144 The inferred anchor text is implemented per L<perlpodspec>:
146 L<name> => L<name|name>
147 L</section> => L<"section"|/section>
148 L<name/section> => L<"section" in name|name/section>
150 The name may contain embedded EE<lt>E<gt> and ZE<lt>E<gt> formatting codes,
151 and the section, anchor text, and inferred anchor text may contain any
152 formatting codes. Any double quotes around the section are removed as part
153 of the parsing, as is any leading or trailing whitespace.
155 If the text of the LE<lt>E<gt> escape is entirely enclosed in double
156 quotes, it's interpreted as a link to a section for backward
159 No attempt is made to resolve formatting codes. This must be done after
160 calling parselink() (since EE<lt>E<gt> formatting codes can be used to
161 escape characters that would otherwise be significant to the parser and
162 resolving them before parsing would result in an incorrect parse of a
163 formatting code like:
165 L<verticalE<verbar>barE<sol>slash>
167 which should be interpreted as a link to the C<vertical|bar/slash> POD page
168 and not as a link to the C<slash> section of the C<bar> POD page with an
169 anchor text of C<vertical>. Note that not only the anchor text will need to
170 have formatting codes expanded, but so will the target of the link (to deal
171 with EE<lt>E<gt> and ZE<lt>E<gt> formatting codes), and special handling of
172 the section may be necessary depending on whether the translator wants to
173 consider markup in sections to be significant when resolving links. See
174 L<perlpodspec> for more information.
180 The current version of this module is always available from its web site at
181 L<http://www.eyrie.org/~eagle/software/podlators/>.
185 Russ Allbery <rra@cpan.org>.
187 =head1 COPYRIGHT AND LICENSE
189 Copyright 2001, 2008, 2009 Russ Allbery <rra@cpan.org>.
191 This program is free software; you may redistribute it and/or modify it
192 under the same terms as Perl itself.