| Pod::Tree::HTML(3pm) | User Contributed Perl Documentation | Pod::Tree::HTML(3pm) |
Pod::Tree::HTML - Generate HTML from a Pod::Tree
use Pod::Tree::HTML;
$source = Pod::Tree->new(%options);
$source = "file.pod";
$source = IO::File->new;
$source = \$pod;
$source = \@pod;
$dest = HTML::Stream->new;
$dest = IO::File->new;
$dest = "file.html";
$html = Pod::Tree::HTML->new($source, $dest, %options);
$html->set_options(%options);
@values = $html->get_options(@keys);
$html->translate;
$html->translate($template);
$html->emit_toc;
$html->emit_body;
$fragment = $html->escape_2396 ($section);
$url = $html->assemble_url($base, $page, $fragment);
"HTML::Stream", "Text::Template"
"Pod::Tree::HTML" reads a POD and translates it to HTML. The source and destination are fixed when the object is created. Options are provided for controlling details of the translation.
The "translate" method does the actual translation.
For convenience, "Pod::Tree::HTML" can read PODs from a variety of sources, and write HTML to a variety of destinations. The "new" method resolves the $source and $dest arguments.
"Pod::Tree::HTML" can also use "Text::Template" to fill in an HTML template file.
"Pod::Tree::HTML" can obtain a POD from any of 5 sources. "new" resolves $source by checking these things, in order:
If $source isn't any of these things, "new" "die"s.
"Pod::Tree::HTML" can write HTML to any of 5 destinations. "new" resolves $dest by checking these things, in order:
If $dest isn't any of these things, "new" "die"s.
$html reads a POD from $source, and writes HTML to $dest. See "Source resolution" and "Destination resolution" for details.
Options controlling the translation may be passed in the %options hash. See "OPTIONS" for details.
In the second form, $template is the name of a file containing a template. The template will be filled in by the "Text::Template" module. Here is a minimal template, showing example usage of all the variables that are set by "Pod::Tree::HTML".
<html>
<head>
<base href="{$base}">
<link href="{$css}" rel="stylesheet" type="text/css">
<title>{$title}</title>
</head>
<body bgcolor="{$bgcolor}" text="{$text}">
{$toc}
{$body}
</body>
</html>
The program fragments in the template are evaulted in the "Pod::Tree::HTML" package. Any variables that you set in this package will be available to your template.
When a template is used, the destination must not be an "HTML::Stream" object.
"translate" doesn't return anything. The first form always returns. The second form "die"s if there is an error creating or filling in the template.
These methods are called automatically by "translate". They are exposed in the API for applications that wish to embed the HTML inside a larger document.
These methods are provided for implementors who write their own link mapper objects.
some section
is returned as
some%20section
$base/$page#$fragment
Attempts to construct a valid URL, even if some of $base, $page, and $fragment are empty.
$level horizontal lines
0 none
1 between TOC and body
2 after each =head1
3 after each =head1 and =head2
Default is level 1.
=head1 NAME
ls - list contents of directory
"Pod::Tree::HTML" automatically generates HTML destination anchors for all =headn command paragraphs, and for text items in =over lists. The text of the paragraph becomes the "name" attribute of the anchor. Markups are ignored and the text is escaped according to RFC 2396.
For example, the paragraph
=head1 C<Foo> Bar
is translated to
<h1><a name="Foo%20Bar"><code>Foo</code> Bar</a></h1>
To link to a heading, simply give the text of the heading in an "L<>" markup. The text must match exactly; markups may vary. Either of these would link to the heading shown above
L</C<Foo> Bar>
L</Foo Bar>
To generate destination anchors in other places, use the index ("X<>") markup
We can link to X<this text> this text.
and link to it as usual
L</this text> uses the index markup.
Earlier versions of this module also emitted the content of the X<> markup as visible text. However, perlpod now specifies that X<> markups render as an empty string, so "Pod::Tree::HTML" has been changed to do that.
The POD specification provides the "L<>" markup to link from one document to another. HTML provides anchors ("<a href=""></a>") for the same purpose. Obviously, a POD2HTML translator should convert the first to the second.
In general, this is a hard problem. In particular, the POD format is not powerful enough to support the kind of hyper-linking that people want in a complex documentation system.
Rather than try to be all things to all people, "Pod::Tree::HTML" uses a link mapper object to translate the target of a POD link to a URL. The default link mapper does a simple translation, described below. If you don't like the default translation, you can provide your own link mapper with the ""link_map" => $link_map" option.
The default link mapper obtains the page and section from the target. It translates "::" sequences in the page to "/", and returns a URL of the form ["../"...][page".html"]["#"section]
If the ""depth" => $depth" option is given, a corresponding number of "../" sequences are prepended to page.
This is a relative URL, so it will be interpreted relative to the ""base" => $url" option, if any.
To use your own link mapper, create a link mapper object and provide it to "Pod::Tree::HTML" with the "link_map" option
sub MyMapper::new { bless {}, shift }
sub MyMapper::url
{
my($mapper, $html, $target) = @_;
...
return $url;
}
$mapper = MyMapper->new;
$html = Pod::Tree::HTML->new(link_map => $mapper);
Your object should implement one method
The "url" method must return a string, which will be emitted as the value of the "href" attribute of an HTML anchor: "<a href=""$url"">"..."</a>"
"Pod:Tree:HTML" provides the "escape_2396" and "assemble_url" methods for convenience in implementing link mappers.
If the link mapper does not provide a "url" method, "Pod::Tree::HTML" will call "map"
The "map" method may perform arbitrary mappings on its arguments. "Pod::Tree::HTML" takes the returned values and constructs a URL of the form [$base/][$page".html"]["#"$fragment]
The "map" method is
perl(1), "Pod::Tree", "Pod::Tree::Node", "Text::Template"
Steven McDougall, swmcd@world.std.com
Copyright (c) 1999-2009 by Steven McDougall. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
| 2019-02-25 | perl v5.28.1 |