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Manual Reference Pages  -  HTML::HEADPARSER (3)

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HTML::HeadParser - Parse <HEAD> section of a HTML document



 require HTML::HeadParser;
 $p = HTML::HeadParser->new;
 $p->parse($text) and  print "not finished";

 $p->header(Title)          # to access <title>....</title>
 $p->header(Content-Base)   # to access <base href="http://...">
 $p->header(Foo)            # to access <meta http-equiv="Foo" content="...">
 $p->header(X-Meta-Author)  # to access <meta name="author" content="...">
 $p->header(X-Meta-Charset) # to access <meta charset="...">


The HTML::HeadParser is a specialized (and lightweight) HTML::Parser that will only parse the <HEAD>...</HEAD> section of an HTML document. The parse() method will return a FALSE value as soon as some <BODY> element or body text are found, and should not be called again after this.

Note that the HTML::HeadParser might get confused if raw undecoded UTF-8 is passed to the parse() method. Make sure the strings are properly decoded before passing them on.

The HTML::HeadParser keeps a reference to a header object, and the parser will update this header object as the various elements of the <HEAD> section of the HTML document are recognized. The following header fields are affected:
Content-Base: The Content-Base header is initialized from the <base href=...> element.
Title: The Title header is initialized from the <title>...</title> element.
Isindex: The Isindex header will be added if there is a <isindex> element in the <head>. The header value is initialized from the prompt attribute if it is present. If no prompt attribute is given it will have ’?’ as the value.
X-Meta-Foo: All <meta> elements containing a name attribute will result in headers using the prefix X-Meta- appended with the value of the name attribute as the name of the header, and the value of the content attribute as the pushed header value.

<meta> elements containing a http-equiv attribute will result in headers as in above, but without the X-Meta- prefix in the header name.

<meta> elements containing a charset attribute will result in an X-Meta-Charset header, using the value of the charset attribute as the pushed header value.

The ’:’ character can’t be represented in header field names, so if the meta element contains this char it’s substituted with ’-’ before forming the field name.


The following methods (in addition to those provided by the superclass) are available:
$hp = HTML::HeadParser->new
$hp = HTML::HeadParser->new( $header ) The object constructor. The optional $header argument should be a reference to an object that implement the header() and push_header() methods as defined by the HTTP::Headers class. Normally it will be of some class that is a or delegates to the HTTP::Headers class.

If no $header is given HTML::HeadParser will create an HTTP::Headers object by itself (initially empty).

$hp->header; Returns a reference to the header object.
$hp->header( $key ) Returns a header value. It is just a shorter way to write $hp->header->header($key).


 $h = HTTP::Headers->new;
 $p = HTML::HeadParser->new($h);
 <title>Stupid example</title>
 <base href="">
 Normal text starts here.
 undef $p;
 print $h->title;   # should print "Stupid example"


HTML::Parser, HTTP::Headers

The HTTP::Headers class is distributed as part of the libwww-perl package. If you don’t have that distribution installed you need to provide the $header argument to the HTML::HeadParser constructor with your own object that implements the documented protocol.


Copyright 1996-2001 Gisle Aas. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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perl v5.20.3 HTML::HEADPARSER (3) 2013-10-21

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