=pod =head1 NAME Pod::Simple::XHTML -- format Pod as validating XHTML =head1 SYNOPSIS use Pod::Simple::XHTML; my $parser = Pod::Simple::XHTML->new(); ... $parser->parse_file('path/to/file.pod'); =head1 DESCRIPTION This class is a formatter that takes Pod and renders it as XHTML validating HTML. This is a subclass of L and inherits all its methods. The implementation is entirely different than L, but it largely preserves the same interface. =cut package Pod::Simple::XHTML; use strict; use vars qw( $VERSION @ISA $HAS_HTML_ENTITIES ); $VERSION = '3.13'; use Carp (); use Pod::Simple::Methody (); @ISA = ('Pod::Simple::Methody'); BEGIN { $HAS_HTML_ENTITIES = eval "require HTML::Entities; 1"; } my %entities = ( q{>} => 'gt', q{<} => 'lt', q{'} => '#39', q{"} => 'quot', q{&} => 'amp', ); sub encode_entities { return HTML::Entities::encode_entities( $_[0] ) if $HAS_HTML_ENTITIES; my $str = $_[0]; my $ents = join '', keys %entities; $str =~ s/([$ents])/'&' . $entities{$1} . ';'/ge; return $str; } #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ =head1 METHODS Pod::Simple::XHTML offers a number of methods that modify the format of the HTML output. Call these after creating the parser object, but before the call to C: my $parser = Pod::PseudoPod::HTML->new(); $parser->set_optional_param("value"); $parser->parse_file($file); =head2 perldoc_url_prefix In turning L into http://whatever/Foo%3a%3aBar, what to put before the "Foo%3a%3aBar". The default value is "http://search.cpan.org/perldoc?". =head2 perldoc_url_postfix What to put after "Foo%3a%3aBar" in the URL. This option is not set by default. =head2 man_url_prefix In turning C<< L >> into http://whatever/man/1/crontab, what to put before the "1/crontab". The default value is "http://man.he.net/man". =head2 man_url_postfix What to put after "1/crontab" in the URL. This option is not set by default. =head2 title_prefix, title_postfix What to put before and after the title in the head. The values should already be &-escaped. =head2 html_css $parser->html_css('path/to/style.css'); The URL or relative path of a CSS file to include. This option is not set by default. =head2 html_javascript The URL or relative path of a JavaScript file to pull in. This option is not set by default. =head2 html_doctype A document type tag for the file. This option is not set by default. =head2 html_header_tags Additional arbitrary HTML tags for the header of the document. The default value is just a content type header tag: Add additional meta tags here, or blocks of inline CSS or JavaScript (wrapped in the appropriate tags). =head2 html_h_level This is the level of HTML "Hn" element to which a Pod "head1" corresponds. For example, if C is set to 2, a head1 will produce an H2, a head2 will produce an H3, and so on. =head2 default_title Set a default title for the page if no title can be determined from the content. The value of this string should already be &-escaped. =head2 force_title Force a title for the page (don't try to determine it from the content). The value of this string should already be &-escaped. =head2 html_header, html_footer Set the HTML output at the beginning and end of each file. The default header includes a title, a doctype tag (if C is set), a content tag (customized by C), a tag for a CSS file (if C is set), and a tag for a Javascript file (if C is set). The default footer simply closes the C and C tags. The options listed above customize parts of the default header, but setting C or C completely overrides the built-in header or footer. These may be useful if you want to use template tags instead of literal HTML headers and footers or are integrating converted POD pages in a larger website. If you want no headers or footers output in the HTML, set these options to the empty string. =head2 index Whether to add a table-of-contents at the top of each page (called an index for the sake of tradition). =cut __PACKAGE__->_accessorize( 'perldoc_url_prefix', 'perldoc_url_postfix', 'man_url_prefix', 'man_url_postfix', 'title_prefix', 'title_postfix', 'html_css', 'html_javascript', 'html_doctype', 'html_header_tags', 'html_h_level', 'title', # Used internally for the title extracted from the content 'default_title', 'force_title', 'html_header', 'html_footer', 'index', 'batch_mode', # whether we're in batch mode 'batch_mode_current_level', # When in batch mode, how deep the current module is: 1 for "LWP", # 2 for "LWP::Procotol", 3 for "LWP::Protocol::GHTTP", etc ); #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ =head1 SUBCLASSING If the standard options aren't enough, you may want to subclass Pod::Simple::XHMTL. These are the most likely candidates for methods you'll want to override when subclassing. =cut sub new { my $self = shift; my $new = $self->SUPER::new(@_); $new->{'output_fh'} ||= *STDOUT{IO}; $new->perldoc_url_prefix('http://search.cpan.org/perldoc?'); $new->man_url_prefix('http://man.he.net/man'); $new->html_header_tags(''); $new->nix_X_codes(1); $new->codes_in_verbatim(1); $new->{'scratch'} = ''; $new->{'to_index'} = []; $new->{'output'} = []; $new->{'saved'} = []; $new->{'ids'} = {}; $new->{'__region_targets'} = []; $new->{'__literal_targets'} = {}; $new->accept_targets_as_html( 'html', 'HTML' ); return $new; } #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ =head2 handle_text This method handles the body of text within any element: it's the body of a paragraph, or everything between a "=begin" tag and the corresponding "=end" tag, or the text within an L entity, etc. You would want to override this if you are adding a custom element type that does more than just display formatted text. Perhaps adding a way to generate HTML tables from an extended version of POD. So, let's say you want add a custom element called 'foo'. In your subclass's C method, after calling C you'd call: $new->accept_targets_as_text( 'foo' ); Then override the C method in the subclass to check for when "$flags->{'target'}" is equal to 'foo' and set a flag that marks that you're in a foo block (maybe "$self->{'in_foo'} = 1"). Then override the C method to check for the flag, and pass $text to your custom subroutine to construct the HTML output for 'foo' elements, something like: sub handle_text { my ($self, $text) = @_; if ($self->{'in_foo'}) { $self->{'scratch'} .= build_foo_html($text); } else { $self->{'scratch'} .= $text; } } =head2 accept_targets_as_html This method behaves like C, but also marks the region as one whose content should be emitted literally, without HTML entity escaping or wrapping in a C
element. =cut sub __in_literal_xhtml_region { return unless @{ $_[0]{__region_targets} }; my $target = $_[0]{__region_targets}[-1]; return $_[0]{__literal_targets}{ $target }; } sub accept_targets_as_html { my ($self, @targets) = @_; $self->accept_targets(@targets); $self->{__literal_targets}{$_} = 1 for @targets; } sub handle_text { # escape special characters in HTML (<, >, &, etc) $_[0]{'scratch'} .= $_[0]->__in_literal_xhtml_region ? $_[1] : encode_entities( $_[1] ); } sub start_Para { $_[0]{'scratch'} = '

' } sub start_Verbatim { $_[0]{'scratch'} = '

' }

sub start_head1 {  $_[0]{'in_head'} = 1 }
sub start_head2 {  $_[0]{'in_head'} = 2 }
sub start_head3 {  $_[0]{'in_head'} = 3 }
sub start_head4 {  $_[0]{'in_head'} = 4 }

sub start_item_number {
    $_[0]{'scratch'} = "\n" if $_[0]{'in_li'};
    $_[0]{'scratch'} .= '
  • ';
    $_[0]{'in_li'} = 1
}

sub start_item_bullet {
    $_[0]{'scratch'} = "
    • \n" if $_[0]{'in_li'};
    $_[0]{'scratch'} .= '
  • ';
    $_[0]{'in_li'} = 1
}

sub start_item_text   {
    if ($_[0]{'in_dd'}[ $_[0]{'dl_level'} ]) {
        $_[0]{'scratch'} = "\n";
        $_[0]{'in_dd'}[ $_[0]{'dl_level'} ] = 0;
    }
    $_[0]{'scratch'} .= '
    ';
}

sub start_over_bullet { $_[0]{'scratch'} = '
      '; $_[0]->emit }
sub start_over_block  { $_[0]{'scratch'} = '
        '; $_[0]->emit }
sub start_over_number { $_[0]{'scratch'} = '
          '; $_[0]->emit }
sub start_over_text   {
    $_[0]{'scratch'} = '
          ';
    $_[0]{'dl_level'}++;
    $_[0]{'in_dd'} ||= [];
    $_[0]->emit
}

sub end_over_block  { $_[0]{'scratch'} .= '
      '; $_[0]->emit }

sub end_over_number   {
    $_[0]{'scratch'} = "\n" if delete $_[0]{'in_li'};
    $_[0]{'scratch'} .= '';
    $_[0]->emit;
}

sub end_over_bullet   {
    $_[0]{'scratch'} = "\n" if delete $_[0]{'in_li'};
    $_[0]{'scratch'} .= '
    ';
    $_[0]->emit;
}

sub end_over_text   {
    if ($_[0]{'in_dd'}[ $_[0]{'dl_level'} ]) {
        $_[0]{'scratch'} = "\n";
        $_[0]{'in_dd'}[ $_[0]{'dl_level'} ] = 0;
    }
    $_[0]{'scratch'} .= '';
    $_[0]{'dl_level'}--;
    $_[0]->emit;
}

# . . . . . Now the actual formatters:

sub end_Para     { $_[0]{'scratch'} .= '
    '; $_[0]->emit }
sub end_Verbatim {
    $_[0]{'scratch'}     .= '
    • '; $_[0]->emit; } sub _end_head { my $h = delete $_[0]{in_head}; my $add = $_[0]->html_h_level; $add = 1 unless defined $add; $h += $add - 1; my $id = $_[0]->idify($_[0]{scratch}); my $text = $_[0]{scratch}; $_[0]{'scratch'} = qq{$text}; $_[0]->emit; push @{ $_[0]{'to_index'} }, [$h, $id, $text]; } sub end_head1 { shift->_end_head(@_); } sub end_head2 { shift->_end_head(@_); } sub end_head3 { shift->_end_head(@_); } sub end_head4 { shift->_end_head(@_); } sub end_item_bullet { $_[0]{'scratch'} .= '

    '; $_[0]->emit } sub end_item_number { $_[0]{'scratch'} .= '

    '; $_[0]->emit } sub end_item_text { $_[0]{'scratch'} .= "\n
    "; $_[0]{'in_dd'}[ $_[0]{'dl_level'} ] = 1; $_[0]->emit; } # This handles =begin and =for blocks of all kinds. sub start_for { my ($self, $flags) = @_; push @{ $self->{__region_targets} }, $flags->{target_matching}; unless ($self->__in_literal_xhtml_region) { $self->{scratch} .= '{scratch} .= qq( class="$flags->{target}") if $flags->{target}; $self->{scratch} .= '>'; } $self->emit; } sub end_for { my ($self) = @_; $self->{'scratch'} .= '
    ' unless $self->__in_literal_xhtml_region; pop @{ $self->{__region_targets} }; $self->emit; } sub start_Document { my ($self) = @_; if (defined $self->html_header) { $self->{'scratch'} .= $self->html_header; $self->emit unless $self->html_header eq ""; } else { my ($doctype, $title, $metatags); $doctype = $self->html_doctype || ''; $title = $self->force_title || $self->title || $self->default_title || ''; $metatags = $self->html_header_tags || ''; if ($self->html_css) { $metatags .= "\n"; } if ($self->html_javascript) { $metatags .= "\n"; } $self->{'scratch'} .= <<"HTML"; $doctype $title $metatags HTML $self->emit; } } sub end_Document { my ($self) = @_; my $to_index = $self->{'to_index'}; if ($self->index && @{ $to_index } ) { my @out; my $level = 0; my $indent = -1; my $space = ''; my $id = ' id="index"'; for my $h (@{ $to_index }, [0]) { my $target_level = $h->[0]; # Get to target_level by opening or closing ULs if ($level == $target_level) { $out[-1] .= ''; } elsif ($level > $target_level) { $out[-1] .= '' if $out[-1] =~ /^\s+
  • /; while ($level > $target_level) { --$level; push @out, (' ' x --$indent) . '
    • ' if @out && $out[-1] =~ m{^\s+<\/ul}; push @out, (' ' x --$indent) . ''; } push @out, (' ' x --$indent) . '' if $level; } else { while ($level < $target_level) { ++$level; push @out, (' ' x ++$indent) . '
  • ' if @out && $out[-1]=~ /^\s*
      "; $id = ''; } ++$indent; } next unless $level; $space = ' ' x $indent; push @out, sprintf '%s
    • %s', $space, $h->[1], $h->[2]; } # Splice the index in between the HTML headers and the first element. my $offset = defined $self->html_header ? $self->html_header eq '' ? 0 : 1 : 1; splice @{ $self->{'output'} }, $offset, 0, join "\n", @out; } if (defined $self->html_footer) { $self->{'scratch'} .= $self->html_footer; $self->emit unless $self->html_footer eq ""; } else { $self->{'scratch'} .= "\n"; $self->emit; } if ($self->index) { print {$self->{'output_fh'}} join ("\n\n", @{ $self->{'output'} }), "\n\n"; @{$self->{'output'}} = (); } } # Handling code tags sub start_B { $_[0]{'scratch'} .= '' } sub end_B { $_[0]{'scratch'} .= '' } sub start_C { $_[0]{'scratch'} .= '' } sub end_C { $_[0]{'scratch'} .= '' } sub start_F { $_[0]{'scratch'} .= '' } sub end_F { $_[0]{'scratch'} .= '' } sub start_I { $_[0]{'scratch'} .= '' } sub end_I { $_[0]{'scratch'} .= '' } sub start_L { my ($self, $flags) = @_; my ($type, $to, $section) = @{$flags}{'type', 'to', 'section'}; my $url = $type eq 'url' ? $to : $type eq 'pod' ? $self->resolve_pod_page_link($to, $section) : $type eq 'man' ? $self->resolve_man_page_link($to, $section) : undef; # If it's an unknown type, use an attribute-less like HTML.pm. $self->{'scratch'} .= '' : '>'); } sub end_L { $_[0]{'scratch'} .= '' } sub start_S { $_[0]{'scratch'} .= '' } sub end_S { $_[0]{'scratch'} .= '' } sub emit { my($self) = @_; if ($self->index) { push @{ $self->{'output'} }, $self->{'scratch'}; } else { print {$self->{'output_fh'}} $self->{'scratch'}, "\n\n"; } $self->{'scratch'} = ''; return; } =head2 resolve_pod_page_link my $url = $pod->resolve_pod_page_link('Net::Ping', 'INSTALL'); my $url = $pod->resolve_pod_page_link('perlpodspec'); my $url = $pod->resolve_pod_page_link(undef, 'SYNOPSIS'); Resolves a POD link target (typically a module or POD file name) and section name to a URL. The resulting link will be returned for the above examples as: http://search.cpan.org/perldoc?Net::Ping#INSTALL http://search.cpan.org/perldoc?perlpodspec #SYNOPSIS Note that when there is only a section argument the URL will simply be a link to a section in the current document. =cut sub resolve_pod_page_link { my ($self, $to, $section) = @_; return undef unless defined $to || defined $section; if (defined $section) { $section = '#' . $self->idify($section, 1); return $section unless defined $to; } else { $section = '' } return ($self->perldoc_url_prefix || '') . encode_entities($to) . $section . ($self->perldoc_url_postfix || ''); } =head2 resolve_man_page_link my $url = $pod->resolve_man_page_link('crontab(5)', 'EXAMPLE CRON FILE'); my $url = $pod->resolve_man_page_link('crontab'); Resolves a man page link target and numeric section to a URL. The resulting link will be returned for the above examples as: http://man.he.net/man5/crontab http://man.he.net/man1/crontab Note that the first argument is required. The section number will be parsed from it, and if it's missing will default to 1. The second argument is currently ignored, as L does not currently include linkable IDs or anchor names in its pages. Subclass to link to a different man page HTTP server. =cut sub resolve_man_page_link { my ($self, $to, $section) = @_; return undef unless defined $to; my ($page, $part) = $to =~ /^([^(]+)(?:[(](\d+)[)])?$/; return undef unless $page; return ($self->man_url_prefix || '') . ($part || 1) . "/" . encode_entities($page) . ($self->man_url_postfix || ''); } =head2 idify my $id = $pod->idify($text); my $hash = $pod->idify($text, 1); This method turns an arbitrary string into a valid XHTML ID attribute value. The rules enforced, following L, are: =over =item * The id must start with a letter (a-z or A-Z) =item * All subsequent characters can be letters, numbers (0-9), hyphens (-), underscores (_), colons (:), and periods (.). =item * Each id must be unique within the document. =back In addition, the returned value will be unique within the context of the Pod::Simple::XHTML object unless a second argument is passed a true value. ID attributes should always be unique within a single XHTML document, but pass the true value if you are creating not an ID but a URL hash to point to an ID (i.e., if you need to put the "#foo" in C<< foo >>. =cut sub idify { my ($self, $t, $not_unique) = @_; for ($t) { s/<[^>]+>//g; # Strip HTML. s/&[^;]+;//g; # Strip entities. s/^([^a-zA-Z]+)$/pod$1/; # Prepend "pod" if no valid chars. s/^[^a-zA-Z]+//; # First char must be a letter. s/[^-a-zA-Z0-9_:.]+/-/g; # All other chars must be valid. } return $t if $not_unique; my $i = ''; $i++ while $self->{ids}{"$t$i"}++; return "$t$i"; } =head2 batch_mode_page_object_init $pod->batch_mode_page_object_init($batchconvobj, $module, $infile, $outfile, $depth); Called by L so that the class has a chance to initialize the converter. Internally it sets the C property to true and sets C, but Pod::Simple::XHTML does not currently use those features. Subclasses might, though. =cut sub batch_mode_page_object_init { my ($self, $batchconvobj, $module, $infile, $outfile, $depth) = @_; $self->batch_mode(1); $self->batch_mode_current_level($depth); return $self; } 1; __END__ =head1 SEE ALSO L, L, L =head1 SUPPORT Questions or discussion about POD and Pod::Simple should be sent to the pod-people@perl.org mail list. Send an empty email to pod-people-subscribe@perl.org to subscribe. This module is managed in an open GitHub repository, L. Feel free to fork and contribute, or to clone L and send patches! Patches against Pod::Simple are welcome. Please send bug reports to . =head1 COPYRIGHT AND DISCLAIMERS Copyright (c) 2003-2005 Allison Randal. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. =head1 ACKNOWLEDGEMENTS Thanks to L for permission to use its L site for man page links. Thanks to L for permission to use the site for Perl module links. =head1 AUTHOR Pod::Simpele::XHTML was created by Allison Randal . Pod::Simple was created by Sean M. Burke . But don't bother him, he's retired. Pod::Simple is maintained by: =over =item * Allison Randal C =item * Hans Dieter Pearcey C =item * David E. Wheeler C =back =cut