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="...">
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.
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:
The Content-Base header is initialized from the <base href="..."> element.
The Title header is initialized from the <title>...</title> element.
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.
All <meta> elements containing a
nameattribute will result in headers using the prefix
X-Meta-appended with the value of the
nameattribute as the name of the header, and the value of the
contentattribute as the pushed header value.
<meta> elements containing a
http-equivattribute will result in headers as in above, but without the
X-Meta-prefix in the header name.
<meta> elements containing a
charsetattribute will result in an
X-Meta-Charsetheader, using the value of the
charsetattribute 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::Headersclass. Normally it will be of some class that is a or delegates to the
If no $header is given
HTML::HeadParserwill create an
HTTP::Headersobject by itself (initially empty).
Returns a reference to the header object.
- $hp->header( $key )
Returns a header value. It is just a shorter way to write
$h = HTTP::Headers->new; $p = HTML::HeadParser->new($h); $p->parse(<<EOT); <title>Stupid example</title> <base href="http://www.linpro.no/lwp/"> Normal text starts here. EOT undef $p; print $h->title; # should print "Stupid example"
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.