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+# Pod::ParseLink -- Parse an L<> formatting code in POD text.
+#
+# Copyright 2001, 2008, 2009 by Russ Allbery <rra@stanford.edu>
+#
+# This program is free software; you may redistribute it and/or modify it
+# under the same terms as Perl itself.
+#
+# This module implements parsing of the text of an L<> formatting code as
+# defined in perlpodspec.  It should be suitable for any POD formatter.  It
+# exports only one function, parselink(), which returns the five-item parse
+# defined in perlpodspec.
+#
+# Perl core hackers, please note that this module is also separately
+# maintained outside of the Perl core as part of the podlators.  Please send
+# me any patches at the address above in addition to sending them to the
+# standard Perl mailing lists.
+
+##############################################################################
+# Modules and declarations
+##############################################################################
+
+package Pod::ParseLink;
+
+require 5.004;
+
+use strict;
+use vars qw(@EXPORT @ISA $VERSION);
+
+use Exporter;
+@ISA    = qw(Exporter);
+@EXPORT = qw(parselink);
+
+$VERSION = '1.10';
+
+##############################################################################
+# Implementation
+##############################################################################
+
+# Parse the name and section portion of a link into a name and section.
+sub _parse_section {
+    my ($link) = @_;
+    $link =~ s/^\s+//;
+    $link =~ s/\s+$//;
+
+    # If the whole link is enclosed in quotes, interpret it all as a section
+    # even if it contains a slash.
+    return (undef, $1) if ($link =~ /^"\s*(.*?)\s*"$/);
+
+    # Split into page and section on slash, and then clean up quoting in the
+    # section.  If there is no section and the name contains spaces, also
+    # guess that it's an old section link.
+    my ($page, $section) = split (/\s*\/\s*/, $link, 2);
+    $section =~ s/^"\s*(.*?)\s*"$/$1/ if $section;
+    if ($page && $page =~ / / && !defined ($section)) {
+        $section = $page;
+        $page = undef;
+    } else {
+        $page = undef unless $page;
+        $section = undef unless $section;
+    }
+    return ($page, $section);
+}
+
+# Infer link text from the page and section.
+sub _infer_text {
+    my ($page, $section) = @_;
+    my $inferred;
+    if ($page && !$section) {
+        $inferred = $page;
+    } elsif (!$page && $section) {
+        $inferred = '"' . $section . '"';
+    } elsif ($page && $section) {
+        $inferred = '"' . $section . '" in ' . $page;
+    }
+    return $inferred;
+}
+
+# Given the contents of an L<> formatting code, parse it into the link text,
+# the possibly inferred link text, the name or URL, the section, and the type
+# of link (pod, man, or url).
+sub parselink {
+    my ($link) = @_;
+    $link =~ s/\s+/ /g;
+    my $text;
+    if ($link =~ /\|/) {
+        ($text, $link) = split (/\|/, $link, 2);
+    }
+    if ($link =~ /\A\w+:[^:\s]\S*\Z/) {
+        my $inferred;
+        if (defined ($text) && length ($text) > 0) {
+            return ($text, $text, $link, undef, 'url');
+        } else {
+            return ($text, $link, $link, undef, 'url');
+        }
+    } else {
+        my ($name, $section) = _parse_section ($link);
+        my $inferred;
+        if (defined ($text) && length ($text) > 0) {
+            $inferred = $text;
+        } else {
+            $inferred = _infer_text ($name, $section);
+        }
+        my $type = ($name && $name =~ /\(\S*\)/) ? 'man' : 'pod';
+        return ($text, $inferred, $name, $section, $type);
+    }
+}
+
+##############################################################################
+# Module return value and documentation
+##############################################################################
+
+# Ensure we evaluate to true.
+1;
+__END__
+
+=head1 NAME
+
+Pod::ParseLink - Parse an LE<lt>E<gt> formatting code in POD text
+
+=for stopwords
+markup Allbery URL
+
+=head1 SYNOPSIS
+
+    use Pod::ParseLink;
+    my ($text, $inferred, $name, $section, $type) = parselink ($link);
+
+=head1 DESCRIPTION
+
+This module only provides a single function, parselink(), which takes the
+text of an LE<lt>E<gt> formatting code and parses it.  It returns the
+anchor text for the link (if any was given), the anchor text possibly
+inferred from the name and section, the name or URL, the section if any,
+and the type of link.  The type will be one of C<url>, C<pod>, or C<man>,
+indicating a URL, a link to a POD page, or a link to a Unix manual page.
+
+Parsing is implemented per L<perlpodspec>.  For backward compatibility,
+links where there is no section and name contains spaces, or links where the
+entirety of the link (except for the anchor text if given) is enclosed in
+double-quotes are interpreted as links to a section (LE<lt>/sectionE<gt>).
+
+The inferred anchor text is implemented per L<perlpodspec>:
+
+    L<name>         =>  L<name|name>
+    L</section>     =>  L<"section"|/section>
+    L<name/section> =>  L<"section" in name|name/section>
+
+The name may contain embedded EE<lt>E<gt> and ZE<lt>E<gt> formatting codes,
+and the section, anchor text, and inferred anchor text may contain any
+formatting codes.  Any double quotes around the section are removed as part
+of the parsing, as is any leading or trailing whitespace.
+
+If the text of the LE<lt>E<gt> escape is entirely enclosed in double
+quotes, it's interpreted as a link to a section for backward
+compatibility.
+
+No attempt is made to resolve formatting codes.  This must be done after
+calling parselink() (since EE<lt>E<gt> formatting codes can be used to
+escape characters that would otherwise be significant to the parser and
+resolving them before parsing would result in an incorrect parse of a
+formatting code like:
+
+    L<verticalE<verbar>barE<sol>slash>
+
+which should be interpreted as a link to the C<vertical|bar/slash> POD page
+and not as a link to the C<slash> section of the C<bar> POD page with an
+anchor text of C<vertical>.  Note that not only the anchor text will need to
+have formatting codes expanded, but so will the target of the link (to deal
+with EE<lt>E<gt> and ZE<lt>E<gt> formatting codes), and special handling of
+the section may be necessary depending on whether the translator wants to
+consider markup in sections to be significant when resolving links.  See
+L<perlpodspec> for more information.
+
+=head1 SEE ALSO
+
+L<Pod::Parser>
+
+The current version of this module is always available from its web site at
+L<http://www.eyrie.org/~eagle/software/podlators/>.
+
+=head1 AUTHOR
+
+Russ Allbery <rra@stanford.edu>.
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2001, 2008, 2009 Russ Allbery <rra@stanford.edu>.
+
+This program is free software; you may redistribute it and/or modify it
+under the same terms as Perl itself.
+
+=cut