phpman > man > HTML::PullParser

NAME
    HTML::PullParser - Alternative HTML::Parser interface

SYNOPSIS
     use HTML::PullParser;

     $p = HTML::PullParser->new(file => "index.html",
                                start => 'event, tagname, @attr',
                                end   => 'event, tagname',
                                ignore_elements => [qw(script style)],
                               ) || die "Can't open: $!";
     while (my $token = $p->get_token) {
         #...do something with $token
     }

DESCRIPTION
    The HTML::PullParser is an alternative interface to the HTML::Parser class. It basically turns
    the HTML::Parser inside out. You associate a file (or any IO::Handle object or string) with the
    parser at construction time and then repeatedly call $parser->get_token to obtain the tags and
    text found in the parsed document.

    The following methods are provided:

    $p = HTML::PullParser->new( file => $file, %options )
    $p = HTML::PullParser->new( doc => \$doc, %options )
        A "HTML::PullParser" can be made to parse from either a file or a literal document based on
        whether the "file" or "doc" option is passed to the parser's constructor.

        The "file" passed in can either be a file name or a file handle object. If a file name is
        passed, and it can't be opened for reading, then the constructor will return an undefined
        value and $! will tell you why it failed. Otherwise the argument is taken to be some object
        that the "HTML::PullParser" can read() from when it needs more data. The stream will be
        read() until EOF, but not closed.

        A "doc" can be passed plain or as a reference to a scalar. If a reference is passed then the
        value of this scalar should not be changed before all tokens have been extracted.

        Next the information to be returned for the different token types must be set up. This is
        done by simply associating an argspec (as defined in HTML::Parser) with the events you have
        an interest in. For instance, if you want "start" tokens to be reported as the string 'S'
        followed by the tagname and the attributes you might pass an "start"-option like this:

           $p = HTML::PullParser->new(
                  doc   => $document_to_parse,
                  start => '"S", tagname, @attr',
                  end   => '"E", tagname',
                );

        At last other "HTML::Parser" options, like "ignore_tags", and "unbroken_text", can be passed
        in. Note that you should not use the *event*_h options to set up parser handlers. That would
        confuse the inner logic of "HTML::PullParser".

    $token = $p->get_token
        This method will return the next *token* found in the HTML document, or "undef" at the end
        of the document. The token is returned as an array reference. The content of this array
        match the argspec set up during "HTML::PullParser" construction.

    $p->unget_token( @tokens )
        If you find out you have read too many tokens you can push them back, so that they are
        returned again the next time $p->get_token is called.

EXAMPLES
    The 'eg/hform' script shows how we might parse the form section of HTML::Documents using
    HTML::PullParser.

SEE ALSO
    HTML::Parser, HTML::TokeParser

COPYRIGHT
    Copyright 1998-2001 Gisle Aas.

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