1HTML::HeadParser(3)   User Contributed Perl Documentation  HTML::HeadParser(3)
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NAME

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

9        require HTML::HeadParser;
10        $p = HTML::HeadParser->new;
11        $p->parse($text) and  print "not finished";
12
13        $p->header('Title')          # to access <title>....</title>
14        $p->header('Content-Base')   # to access <base href="http://...">
15        $p->header('Foo')            # to access <meta http-equiv="Foo" content="...">
16        $p->header('X-Meta-Author')  # to access <meta name="author" content="...">
17        $p->header('X-Meta-Charset') # to access <meta charset="...">
18

DESCRIPTION

20       The "HTML::HeadParser" is a specialized (and lightweight)
21       "HTML::Parser" that will only parse the <HEAD>...</HEAD> section of an
22       HTML document.  The parse() method will return a FALSE value as soon as
23       some <BODY> element or body text are found, and should not be called
24       again after this.
25
26       Note that the "HTML::HeadParser" might get confused if raw undecoded
27       UTF-8 is passed to the parse() method.  Make sure the strings are
28       properly decoded before passing them on.
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30       The "HTML::HeadParser" keeps a reference to a header object, and the
31       parser will update this header object as the various elements of the
32       <HEAD> section of the HTML document are recognized.  The following
33       header fields are affected:
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35       Content-Base:
36           The Content-Base header is initialized from the <base href="...">
37           element.
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39       Title:
40           The Title header is initialized from the <title>...</title>
41           element.
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43       Isindex:
44           The Isindex header will be added if there is a <isindex> element in
45           the <head>.  The header value is initialized from the prompt
46           attribute if it is present.  If no prompt attribute is given it
47           will have '?' as the value.
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49       X-Meta-Foo:
50           All <meta> elements containing a "name" attribute will result in
51           headers using the prefix "X-Meta-" appended with the value of the
52           "name" attribute as the name of the header, and the value of the
53           "content" attribute as the pushed header value.
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55           <meta> elements containing a "http-equiv" attribute will result in
56           headers as in above, but without the "X-Meta-" prefix in the header
57           name.
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59           <meta> elements containing a "charset" attribute will result in an
60           "X-Meta-Charset" header, using the value of the "charset" attribute
61           as the pushed header value.
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63           The ':' character can't be represented in header field names, so if
64           the meta element contains this char it's substituted with '-'
65           before forming the field name.
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METHODS

68       The following methods (in addition to those provided by the superclass)
69       are available:
70
71       $hp = HTML::HeadParser->new
72       $hp = HTML::HeadParser->new( $header )
73           The object constructor.  The optional $header argument should be a
74           reference to an object that implement the header() and
75           push_header() methods as defined by the "HTTP::Headers" class.
76           Normally it will be of some class that is a or delegates to the
77           "HTTP::Headers" class.
78
79           If no $header is given "HTML::HeadParser" will create an
80           "HTTP::Headers" object by itself (initially empty).
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82       $hp->header;
83           Returns a reference to the header object.
84
85       $hp->header( $key )
86           Returns a header value.  It is just a shorter way to write
87           "$hp->header->header($key)".
88

EXAMPLE

90        $h = HTTP::Headers->new;
91        $p = HTML::HeadParser->new($h);
92        $p->parse(<<EOT);
93        <title>Stupid example</title>
94        <base href="http://www.linpro.no/lwp/">
95        Normal text starts here.
96        EOT
97        undef $p;
98        print $h->title;   # should print "Stupid example"
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SEE ALSO

101       HTML::Parser, HTTP::Headers
102
103       The "HTTP::Headers" class is distributed as part of the libwww-perl
104       package.  If you don't have that distribution installed you need to
105       provide the $header argument to the "HTML::HeadParser" constructor with
106       your own object that implements the documented protocol.
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109       Copyright 1996-2001 Gisle Aas. All rights reserved.
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111       This library is free software; you can redistribute it and/or modify it
112       under the same terms as Perl itself.
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116perl v5.34.1                      2022-03-31               HTML::HeadParser(3)
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