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DataFlow-0.91.10
River stage one • 8 direct dependents • 8 total dependents
++
/ DataFlow::Node::HTMLFilter

NAME

DataFlow::Node::HTMLFilter - A HTML filtering node

VERSION

version 0.91.10

SYNOPSIS

    use DataFlow::Node::HTMLFilter;

    my $filter_html = DataFlow::Node::HTMLFilter->new(
        search_xpath => '//td',
        result_type  => 'HTML',
        );

    my $filter_value = DataFlow::Node::HTMLFilter->new(
        search_xpath => '//td',
        result_type  => 'VALUE',
        );

    my $input = <<EOM;
    <html><body>
      <table>
        <tr><td>Line 1</td><td>L1, Column 2</td>
        <tr><td>Line 2</td><td>L2, Column 2</td>
      </table>
    </html></body>
    EOM

    $filter_html->input( $input );
    # @result == '<td>Line 1</td>', ... '<td>L2, Column 2</td>'

    $filter_value->input( $input );
    # @result == q{Line 1}, ... q{L2, Column 2}

DESCRIPTION

This node type provides a filter for HTML content. Each item will be considered as a HTML content and will be filtered using HTML::TreeBuilder::XPath.

ATTRIBUTES

search_xpath

This attribute is a XPath string used to filter down the HTML content. The search_xpath attribute is mandatory.

result_type

This attribute is a string, but its value must be one of: HTML, VALUE, NODE. The default is HTML.

HTML

The result will be the HTML content specified by search_xpath.

VALUE

The result will be the literal value enclosed by the tag and/or attribute specified by search_xpath.

NODE

The result will be a list of HTML::Element objects, as returned by the findnodes method of HTML::TreeBuilder::XPath class.

Most people will probably use HTML or VALUE, but this option is also provided in case someone wants to manipulate the HTML elements directly.

ref_result

This attribute is a boolean, and it signals whether the result list should be added as a list of items to the output queue, or as a reference to an array of items. The default is 0 (false).

There is a semantic subtlety here: if ref_result is 1 (true), then one HTML item (input) may generate one or zero ArrayRef item (output), i.e. it is a one-to-one mapping. On the other hand, by keeping ref_result as 0 (false), one HTML item may produce any number of items as result, i.e. it is a one-to-many mapping.

METHODS

The interface for DataFlow::Node::HTMLFilter is the same of DataFlow::Node, plus the accessor methods for the attributes described above.

DEPENDENCIES

DataFlow::Node

HTML::TreeBuilder::XPath

HTML::Element

AUTHOR

Alexei Znamensky <russoz@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Alexei Znamensky.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS AND LIMITATIONS

No bugs have been reported.

Please report any bugs or feature requests through the web interface at http://github.com/russoz/DataFlow/issues.

AVAILABILITY

The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit http://www.perl.com/CPAN/ to find a CPAN site near you, or see http://search.cpan.org/dist/DataFlow/.

The development version lives at http://github.com/russoz/DataFlow and may be cloned from git://github.com/russoz/DataFlow.git. Instead of sending patches, please fork this project using the standard git and github infrastructure.

DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.