1Web::Scraper::Filter(3pUms)er Contributed Perl DocumentatWieobn::Scraper::Filter(3pm)
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NAME

6       Web::Scraper::Filter - Base class for Web::Scraper filters
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SYNOPSIS

9         package Web::Scraper::Filter::YAML;
10         use base qw( Web::Scraper::Filter );
11         use YAML ();
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13         sub filter {
14             my($self, $value) = @_;
15             YAML::Load($value);
16         }
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18         1;
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20         use Web::Scraper;
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22         my $scraper = scraper {
23             process ".yaml-code", data => [ 'TEXT', 'YAML' ];
24         };
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DESCRIPTION

27       Web::Scraper::Filter is a base class for text filters in Web::Scraper.
28       You can create your own text filter by subclassing this module.
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30       There are two ways to create and use your custom filter. If you name
31       your filter Web::Scraper::Filter::Something, you just call:
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33         process $exp, $key => [ 'TEXT', 'Something' ];
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35       If you declare your filter under your own namespace, like
36       'MyApp::Filter::Foo',
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38         process $exp, $key => [ 'TEXT', '+MyApp::Filter::Foo' ];
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40       You can also inline your filter function or regexp without creating a
41       filter class:
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43         process $exp, $key => [ 'TEXT', sub { s/foo/bar/ } ];
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45         process $exp, $key => [ 'TEXT', qr/Price: (\d+)/ ];
46         process $exp, $key => [ 'TEXT', qr/(?<name>\w+): (?<value>\w+)/ ];
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48       Note that this function munges $_ and returns the count of replacement.
49       Filter code special cases if the return value of the callback is number
50       and $_ value is updated.
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52       You can, of course, stack filters like:
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54         process $exp, $key => [ '@href', 'Foo', '+MyApp::Filter::Bar', \&baz ];
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AUTHOR

57       Tatsuhiko Miyagawa
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61perl v5.30.0                      2019-07-26         Web::Scraper::Filter(3pm)