1 # Pod::ParseLink -- Parse an L<> formatting code in POD text.
3 # Copyright 2001, 2008, 2009 by Russ Allbery <rra@stanford.edu>
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;
27 use vars qw(@EXPORT @ISA $VERSION);
31 @EXPORT = qw(parselink);
35 ##############################################################################
37 ##############################################################################
39 # Parse the name and section portion of a link into a name and section.
45 # If the whole link is enclosed in quotes, interpret it all as a section
46 # even if it contains a slash.
47 return (undef, $1) if ($link =~ /^"\s*(.*?)\s*"$/);
49 # Split into page and section on slash, and then clean up quoting in the
50 # section. If there is no section and the name contains spaces, also
51 # guess that it's an old section link.
52 my ($page, $section) = split (/\s*\/\s*/, $link, 2);
53 $section =~ s/^"\s*(.*?)\s*"$/$1/ if $section;
54 if ($page && $page =~ / / && !defined ($section)) {
58 $page = undef unless $page;
59 $section = undef unless $section;
61 return ($page, $section);
64 # Infer link text from the page and section.
66 my ($page, $section) = @_;
68 if ($page && !$section) {
70 } elsif (!$page && $section) {
71 $inferred = '"' . $section . '"';
72 } elsif ($page && $section) {
73 $inferred = '"' . $section . '" in ' . $page;
78 # Given the contents of an L<> formatting code, parse it into the link text,
79 # the possibly inferred link text, the name or URL, the section, and the type
80 # of link (pod, man, or url).
86 ($text, $link) = split (/\|/, $link, 2);
88 if ($link =~ /\A\w+:[^:\s]\S*\Z/) {
90 if (defined ($text) && length ($text) > 0) {
91 return ($text, $text, $link, undef, 'url');
93 return ($text, $link, $link, undef, 'url');
96 my ($name, $section) = _parse_section ($link);
98 if (defined ($text) && length ($text) > 0) {
101 $inferred = _infer_text ($name, $section);
103 my $type = ($name && $name =~ /\(\S*\)/) ? 'man' : 'pod';
104 return ($text, $inferred, $name, $section, $type);
108 ##############################################################################
109 # Module return value and documentation
110 ##############################################################################
112 # Ensure we evaluate to true.
118 Pod::ParseLink - Parse an LE<lt>E<gt> formatting code in POD text
126 my ($text, $inferred, $name, $section, $type) = parselink ($link);
130 This module only provides a single function, parselink(), which takes the
131 text of an LE<lt>E<gt> formatting code and parses it. It returns the
132 anchor text for the link (if any was given), the anchor text possibly
133 inferred from the name and section, the name or URL, the section if any,
134 and the type of link. The type will be one of C<url>, C<pod>, or C<man>,
135 indicating a URL, a link to a POD page, or a link to a Unix manual page.
137 Parsing is implemented per L<perlpodspec>. For backward compatibility,
138 links where there is no section and name contains spaces, or links where the
139 entirety of the link (except for the anchor text if given) is enclosed in
140 double-quotes are interpreted as links to a section (LE<lt>/sectionE<gt>).
142 The inferred anchor text is implemented per L<perlpodspec>:
144 L<name> => L<name|name>
145 L</section> => L<"section"|/section>
146 L<name/section> => L<"section" in name|name/section>
148 The name may contain embedded EE<lt>E<gt> and ZE<lt>E<gt> formatting codes,
149 and the section, anchor text, and inferred anchor text may contain any
150 formatting codes. Any double quotes around the section are removed as part
151 of the parsing, as is any leading or trailing whitespace.
153 If the text of the LE<lt>E<gt> escape is entirely enclosed in double
154 quotes, it's interpreted as a link to a section for backward
157 No attempt is made to resolve formatting codes. This must be done after
158 calling parselink() (since EE<lt>E<gt> formatting codes can be used to
159 escape characters that would otherwise be significant to the parser and
160 resolving them before parsing would result in an incorrect parse of a
161 formatting code like:
163 L<verticalE<verbar>barE<sol>slash>
165 which should be interpreted as a link to the C<vertical|bar/slash> POD page
166 and not as a link to the C<slash> section of the C<bar> POD page with an
167 anchor text of C<vertical>. Note that not only the anchor text will need to
168 have formatting codes expanded, but so will the target of the link (to deal
169 with EE<lt>E<gt> and ZE<lt>E<gt> formatting codes), and special handling of
170 the section may be necessary depending on whether the translator wants to
171 consider markup in sections to be significant when resolving links. See
172 L<perlpodspec> for more information.
178 The current version of this module is always available from its web site at
179 L<http://www.eyrie.org/~eagle/software/podlators/>.
183 Russ Allbery <rra@stanford.edu>.
185 =head1 COPYRIGHT AND LICENSE
187 Copyright 2001, 2008, 2009 Russ Allbery <rra@stanford.edu>.
189 This program is free software; you may redistribute it and/or modify it
190 under the same terms as Perl itself.