Devel::PartialDump(3pmUser Contributed Perl DocumentatiDevel::PartialDump(3pm)
NAME
Devel::PartialDump - Partial dumping of data structures, optimized for
argument printing.
VERSION
version 0.20
SYNOPSIS
use Devel::PartialDump;
sub foo {
print "foo called with args: " . Devel::PartialDump->new->dump(@_);
}
use Devel::PartialDump qw(warn);
# warn is overloaded to create a concise dump instead of stringifying $some_bad_data
warn "this made a boo boo: ", $some_bad_data
DESCRIPTION
This module is a data dumper optimized for logging of arbitrary
parameters.
It attempts to truncate overly verbose data, in a way that is hopefully
more useful for diagnostics warnings than
warn Dumper(@stuff);
Unlike other data dumping modules there are no attempts at correctness
or cross referencing, this is only meant to provide a slightly deeper
look into the data in question.
There is a default recursion limit, and a default truncation of long
lists, and the dump is formatted on one line (new lines in strings are
escaped), to aid in readability.
You can enable it temporarily by importing functions like "warn",
"croak" etc to get more informative errors during development, or even
use it as:
BEGIN { local $@; eval "use Devel::PartialDump qw(...)" }
to get DWIM formatting only if it's installed, without introducing a
dependency.
SAMPLE OUTPUT
"foo"
"foo"
"foo" => "bar"
foo: "bar"
"foo => "bar", gorch => [ 1, "bah" ]"
foo: "bar", gorch: [ 1, "bah" ]
"[ { foo => ["bar"] } ]"
[ { foo: ARRAY(0x9b265d0) } ]
"[ 1 .. 10 ]"
[ 1, 2, 3, 4, 5, 6, ... ]
"foo\nbar"
"foo\nbar"
""foo" . chr(1)"
"foo\x{1}"
ATTRIBUTES
max_length
The maximum character length of the dump.
Anything bigger than this will be truncated.
Not defined by default.
max_elements
The maximum number of elements (array elements or pairs in a hash)
to print.
Defaults to 6.
max_depth
The maximum level of recursion.
Defaults to 2.
stringify
Whether or not to let objects stringify themselves, instead of
using "StrVal" in overload to avoid side effects.
Defaults to false (no overloading).
pairs
Whether or not to autodetect named args as pairs in the main "dump"
function. If this attribute is true, and the top level value list
is even sized, and every odd element is not a reference, then it
will dumped as pairs instead of a list.
EXPORTS
All exports are optional, nothing is exported by default.
This module uses Sub::Exporter, so exports can be renamed, curried,
etc.
warn
show
show_scalar
croak
carp
confess
cluck
dump
See the various methods for behavior documentation.
These methods will use $Devel::PartialDump::default_dumper as the
invocant if the first argument is not blessed and "isa"
Devel::PartialDump, so they can be used as functions too.
Particularly "warn" can be used as a drop in replacement for the
built in warn:
warn "blah blah: ", $some_data;
by importing
use Devel::PartialDump qw(warn);
$some_data will be have some of it's data dumped.
$default_dumper
The default dumper object to use for export style calls.
Can be assigned to to alter behavior globally.
This is generally useful when using the "warn" export as a drop in
replacement for "CORE::warn".
METHODS
warn @blah
A wrapper for "dump" that prints strings plainly.
show @blah
show_scalar $x
Like "warn", but instead of returning the value from "warn" it
returns its arguments, so it can be used in the middle of an
expression.
Note that
my $x = show foo();
will actually evaluate "foo" in list context, so if you only want
to dump a single element and retain scalar context use
my $x = show_scalar foo();
which has a prototype of "$" (as opposed to taking a list).
This is similar to the venerable Ingy's fabulous and amazing XXX
module.
carp
croak
confess
cluck
Drop in replacements for Carp exports, that format their arguments
like "warn".
dump @stuff
Returns a one line, human readable, concise dump of @stuff.
If called in void context, will "warn" with the dump.
Truncates the dump according to "max_length" if specified.
dump_as_list $depth, @stuff
dump_as_pairs $depth, @stuff
Dump @stuff using the various formatting functions.
Dump as pairs returns comma delimited pairs with "=>" between the
key and the value.
Dump as list returns a comma delimited dump of the values.
format $depth, $value
format_key $depth, $key
format_object $depth, $object
format_ref $depth, $Ref
format_array $depth, $array_ref
format_hash $depth, $hash_ref
format_undef $depth, undef
format_string $depth, $string
format_number $depth, $number
quote $string
The various formatting methods.
You can override these to provide a custom format.
"format_array" and "format_hash" recurse with "$depth + 1" into
"dump_as_list" and "dump_as_pairs" respectively.
"format_ref" delegates to "format_array" and "format_hash" and does
the "max_depth" tracking. It will simply stringify the ref if the
recursion limit has been reached.
SUPPORT
Bugs may be submitted through the RT bug tracker
<https://rt.cpan.org/Public/Dist/Display.html?Name=Devel-PartialDump>
(or bug-Devel-PartialDump@rt.cpan.org <mailto:bug-Devel-
PartialDump@rt.cpan.org>).
There is also a mailing list available for users of this distribution,
at <http://lists.perl.org/list/moose.html>.
There is also an irc channel available for users of this distribution,
at "#moose" on "irc.perl.org" <irc://irc.perl.org/#moose>.
AUTHOR
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
CONTRIBUTORS
• Karen Etheridge <ether@cpan.org>
• Florian Ragwitz <rafl@debian.org>
• Steven Lee <stevenwh.lee@gmail.com>
• Leo Lapworth <web@web-teams-computer.local>
• Jesse Luehrs <doy@tozt.net>
• David Golden <dagolden@cpan.org>
• Paul Howarth <paul@city-fan.org>
COPYRIGHT AND LICENCE
This software is copyright (c) 2008 by יובל קוג'מן (Yuval Kogman).
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
perl v5.34.0 2022-06-13 Devel::PartialDump(3pm)
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