CPAN::Meta::Merge(3pm) Perl Programmers Reference Guide
NAME
CPAN::Meta::Merge - Merging CPAN Meta fragments
VERSION
version 2.150010
SYNOPSIS
my $merger = CPAN::Meta::Merge->new(default_version => "2");
my $meta = $merger->merge($base, @additional);
DESCRIPTION
METHODS
new
This creates a CPAN::Meta::Merge object. It takes one mandatory named
argument, "version", declaring the version of the meta-spec that must
be used for the merge. It can optionally take an "extra_mappings"
argument that allows one to add additional merging functions for
specific elements.
The "extra_mappings" arguments takes a hash ref with the same type of
structure as described in CPAN::Meta::Spec, except with its values as
one of the defined merge strategies or a code ref to a merging
function.
my $merger = CPAN::Meta::Merge->new(
default_version => '2',
extra_mappings => {
'optional_features' => \&custom_merge_function,
'x_custom' => 'set_addition',
'x_meta_meta' => {
name => 'identical',
tags => 'set_addition',
}
}
);
merge(@fragments)
Merge all @fragments together. It will accept both CPAN::Meta objects
and (possibly incomplete) hashrefs of metadata.
MERGE STRATEGIES
"merge" uses various strategies to combine different elements of the
CPAN::Meta objects. The following strategies can be used with the
extra_mappings argument of "new":
identical
The elements must be identical
set_addition
The union of two array refs
[ a, b ] U [ a, c] = [ a, b, c ]
uniq_map
Key value pairs from the right hash are merged to the left hash.
Key collisions are only allowed if their values are the same. This
merge function will recurse into nested hash refs following the
same merge rules.
improvise
This merge strategy will try to pick the appropriate predefined
strategy based on what element type. Array refs will try to use
the "set_addition" strategy, Hash refs will try to use the
"uniq_map" strategy, and everything else will try the "identical"
strategy.
AUTHORS
o David Golden <dagolden@cpan.org>
o Ricardo Signes <rjbs@cpan.org>
o Adam Kennedy <adamk@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by David Golden, Ricardo Signes,
Adam Kennedy and Contributors.
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 v5.38.2 2023-11-28 CPAN::Meta::Merge(3pm)
perl 5.38.2 - Generated Wed Dec 4 10:50:05 CST 2024