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Data::Printer::Filter::Digest(3pm) | User Contributed Perl Documentation | Data::Printer::Filter::Digest(3pm) |
NAME¶
Data::Printer::Filter::Digest - pretty-printing MD5, SHA and friendsSYNOPSIS¶
In your program:use Data::Printer filters => { -external => [ 'Digest' ], };
or, in your ".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. }, };
DESCRIPTION¶
This is a filter plugin for Data::Printer. It filters through several digest classes and displays their current value in hexadecimal format as a string.Parsed Modules¶
- Digest::Adler32
- Digest::MD2
- Digest::MD4
- Digest::MD5
- Digest::SHA
- Digest::SHA1
- Digest::Whirlpool
If you have any suggestions for more modules or better output, please let us know.
Extra Options¶
Aside from the display color, there are a few other options to be customized via the "digest" option key:show_class_name
Set this to true to display the class name right next to the hexadecimal digest. Default is 0 (false).
show_reset
If set to true (the default), the filter will add a "[reset]" tag after dumping an empty digest object. See the rationale below.
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 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 "[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.
SEE ALSO¶
Data::Printer2017-10-14 | perl v5.26.0 |