📄 html::headparser.3
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Always turn off hyphenation; it makes.\" way too many mistakes in technical documents..if n .ad l.nh.SH "NAME"HTML::HeadParser \- Parse <HEAD> section of a HTML document.SH "SYNOPSIS".IX Header "SYNOPSIS".Vb 3\& require HTML::HeadParser;\& $p = HTML::HeadParser\->new;\& $p\->parse($text) and print "not finished";\&\& $p\->header(\*(AqTitle\*(Aq) # to access <title>....</title>\& $p\->header(\*(AqContent\-Base\*(Aq) # to access <base href="http://...">\& $p\->header(\*(AqFoo\*(Aq) # to access <meta http\-equiv="Foo" content="...">.Ve.SH "DESCRIPTION".IX Header "DESCRIPTION"The \f(CW\*(C`HTML::HeadParser\*(C'\fR is a specialized (and lightweight)\&\f(CW\*(C`HTML::Parser\*(C'\fR that will only parse the <\s-1HEAD\s0>...</HEAD>section of an \s-1HTML\s0 document. The \fIparse()\fR methodwill return a \s-1FALSE\s0 value as soon as some <\s-1BODY\s0> element or bodytext are found, and should not be called again after this..PPNote that the \f(CW\*(C`HTML::HeadParser\*(C'\fR might get confused if raw undecoded\&\s-1UTF\-8\s0 is passed to the \fIparse()\fR method. Make sure the strings areproperly decoded before passing them on..PPThe \f(CW\*(C`HTML::HeadParser\*(C'\fR keeps a reference to a header object, and theparser will update this header object as the various elements of the<\s-1HEAD\s0> section of the \s-1HTML\s0 document are recognized. The followingheader fields are affected:.IP "Content-Base:" 4.IX Item "Content-Base:"The \fIContent-Base\fR header is initialized from the <basehref=\*(L"...\*(R"> element..IP "Title:" 4.IX Item "Title:"The \fITitle\fR header is initialized from the <title>...</title>element..IP "Isindex:" 4.IX Item "Isindex:"The \fIIsindex\fR header will be added if there is a <isindex>element in the <head>. The header value is initialized from the\&\fIprompt\fR attribute if it is present. If no \fIprompt\fR attribute isgiven it will have '?' as the value..IP "X\-Meta-Foo:" 4.IX Item "X-Meta-Foo:"All <meta> elements will initialize headers with the prefix"\f(CW\*(C`X\-Meta\-\*(C'\fR" on the name. If the <meta> element contains a\&\f(CW\*(C`http\-equiv\*(C'\fR attribute, then it will be honored as the header name..SH "METHODS".IX Header "METHODS"The following methods (in addition to those provided by thesuperclass) are available:.ie n .IP "$hp = HTML::HeadParser\->new" 4.el .IP "\f(CW$hp\fR = HTML::HeadParser\->new" 4.IX Item "$hp = HTML::HeadParser->new".PD 0.ie n .IP "$hp\fR = HTML::HeadParser\->new( \f(CW$header )" 4.el .IP "\f(CW$hp\fR = HTML::HeadParser\->new( \f(CW$header\fR )" 4.IX Item "$hp = HTML::HeadParser->new( $header )".PDThe object constructor. The optional \f(CW$header\fR argument should be areference to an object that implement the \fIheader()\fR and \fIpush_header()\fRmethods as defined by the \f(CW\*(C`HTTP::Headers\*(C'\fR class. Normally it will beof some class that isa or delegates to the \f(CW\*(C`HTTP::Headers\*(C'\fR class..SpIf no \f(CW$header\fR is given \f(CW\*(C`HTML::HeadParser\*(C'\fR will create an\&\f(CW\*(C`HTTP::Header\*(C'\fR object by itself (initially empty)..ie n .IP "$hp\->header;" 4.el .IP "\f(CW$hp\fR\->header;" 4.IX Item "$hp->header;"Returns a reference to the header object..ie n .IP "$hp\fR\->header( \f(CW$key )" 4.el .IP "\f(CW$hp\fR\->header( \f(CW$key\fR )" 4.IX Item "$hp->header( $key )"Returns a header value. It is just a shorter way to write\&\f(CW\*(C`$hp\->header\->header($key)\*(C'\fR..SH "EXAMPLE".IX Header "EXAMPLE".Vb 9\& $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 $h\->title; # should print "Stupid example".Ve.SH "SEE ALSO".IX Header "SEE ALSO"HTML::Parser, HTTP::Headers.PPThe \f(CW\*(C`HTTP::Headers\*(C'\fR class is distributed as part of the\&\fIlibwww-perl\fR package. If you don't have that distribution installedyou need to provide the \f(CW$header\fR argument to the \f(CW\*(C`HTML::HeadParser\*(C'\fRconstructor with your own object that implements the documentedprotocol..SH "COPYRIGHT".IX Header "COPYRIGHT"Copyright 1996\-2001 Gisle Aas. All rights reserved..PPThis library is free software; you can redistribute it and/ormodify it under the same terms as Perl itself.⌨️ 快捷键说明
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