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Digest.pm
package Data::Printer::Filter::Digest; use strict; use warnings; use Data::Printer::Filter; use Term::ANSIColor; foreach my $digest ( qw(Digest::MD2 Digest::MD4) ) { filter $digest => \&_print_digest; } filter '-class', sub { my ($obj, $p) = @_; return unless $obj->isa( 'Digest::base' ); return _print_digest( $obj, $p ); }; sub _print_digest { my ($obj, $p) = @_; my $digest = $obj->clone->hexdigest; my $str = $digest; my $ref = ref $obj; if ( $p->{digest}{show_class_name} ) { $str .= " ($ref)"; } unless ( exists $p->{digest}{show_reset} and !$p->{digest}{show_reset} ) { if ($digest eq $ref->new->hexdigest) { $str .= ' [reset]'; } } my $color = $p->{color}{digest}; $color = 'bright_green' unless defined $color; return colored( $str, $color ); } 1; __END__ =head1 NAME Data::Printer::Filter::Digest - pretty-printing MD5, SHA and friends =head1 SYNOPSIS In your program: use Data::Printer filters => { -external => [ 'Digest' ], }; or, in your C<.dataprinter> file: { filters => { -external => [ 'Digest' ], }, }; You can also setup color and display details: use Data::Printer filters => { -external => [ 'Digest' ], }, color => { digest => 'bright_green', } digest => { show_class_name => 0, # default. show_reset => 1, # default. }, }; =head1 DESCRIPTION This is a filter plugin for L<Data::Printer>. It filters through several digest classes and displays their current value in hexadecimal format as a string. =head2 Parsed Modules =over 4 =item * L<Digest::Adler32> =item * L<Digest::MD2> =item * L<Digest::MD4> =item * L<Digest::MD5> =item * L<Digest::SHA> =item * L<Digest::SHA1> =item * L<Digest::Whirlpool> =back If you have any suggestions for more modules or better output, please let us know. =head2 Extra Options Aside from the display color, there are a few other options to be customized via the C<digest> option key: =head3 show_class_name Set this to true to display the class name right next to the hexadecimal digest. Default is 0 (false). =head3 show_reset If set to true (the default), the filter will add a C<[reset]> tag after dumping an empty digest object. See the rationale below. =head2 Note on dumping Digest::* objects The digest operation is effectively a destructive, read-once operation. Once it has been performed, most Digest::* objects are automatically reset and can be used to calculate another digest value. This behaviour - or, rather, forgetting about this behaviour - is a common source of issues when working with Digests. This Data::Printer filter will B<not> destroy your object. Instead, we work on a cloned version to display the hexdigest, leaving your original object untouched. As another debugging convenience for developers, since the empty object will produce a digest even after being used, this filter adds by default a C<[reset]> tag to indicate that the object is empty, in a 'reset' state - i.e. its hexdigest is the same as the hexdigest of a new, empty object of that same class. =head1 SEE ALSO L<Data::Printer>
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