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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

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CentOS 5.4

HTML::HeadParser(3pm)
HTML::HeadParser

HTML::HeadParser

NAME
SYNOPSIS
DESCRIPTION
METHODS
EXAMPLE
SEE ALSO
COPYRIGHT

NAME

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

SYNOPSIS 

 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="...">

DESCRIPTION

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 will initialize headers with the prefix ""X−Meta−"" on the name. If the <meta> element contains a "http−equiv" attribute, then it will be honored as the header name.

METHODS

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 isa or delegates to the "HTTP::Headers" class.

If no $header is given "HTML::HeadParser" will create an "HTTP::Header" 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)".

EXAMPLE 

 $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"

SEE ALSO

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

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.

HTML::HeadParser(3pm)