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package Data::ModeMerge::Mode::SUBTRACT; |
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our $DATE = '2016-02-25'; # DATE |
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our $VERSION = '0.33'; # VERSION |
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use 5.010; |
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use strict; |
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use warnings; |
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use Mo qw(build default); |
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extends 'Data::ModeMerge::Mode::NORMAL'; |
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sub name { 'SUBTRACT' } |
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sub precedence_level { 4 } |
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sub default_prefix { '-' } |
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sub default_prefix_re { qr/^-/ } |
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sub merge_SCALAR_SCALAR { |
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my ($self, $key, $l, $r) = @_; |
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($key, $l - $r); |
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} |
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sub merge_SCALAR_ARRAY { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract scalar and array"); |
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return; |
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} |
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sub merge_SCALAR_HASH { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract scalar and hash"); |
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return; |
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} |
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sub merge_ARRAY_SCALAR { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract array and scalar"); |
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return; |
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} |
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sub merge_ARRAY_ARRAY { |
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my ($self, $key, $l, $r) = @_; |
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my @res; |
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my $mm = $self->merger; |
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for (@$l) { |
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push @res, $_ unless $mm->_in($_, $r); |
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} |
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($key, \@res); |
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} |
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sub merge_ARRAY_HASH { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract array and hash"); |
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return; |
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} |
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sub merge_HASH_SCALAR { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract hash and scalar"); |
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return; |
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} |
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sub merge_HASH_ARRAY { |
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my ($self, $key, $l, $r) = @_; |
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$self->merger->push_error("Can't subtract hash and array"); |
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return; |
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} |
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sub merge_HASH_HASH { |
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my ($self, $key, $l, $r) = @_; |
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my $mm = $self->merger; |
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my %res; |
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my $r2 = {}; |
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for (keys %$r) { |
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my $k = $mm->check_prefix($_) ? $_ : $mm->add_prefix($_, 'DELETE'); |
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if ($k ne $_ && exists($r->{$k})) { |
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$mm->push_error("Conflict when adding DELETE prefix on right-side hash key $_ ". |
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"for SUBTRACT merge: key $k already exists"); |
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return; |
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} |
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$r2->{$k} = $r->{$_}; |
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} |
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$mm->_merge($key, $l, $r2, 'NORMAL'); |
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} |
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1; |
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# ABSTRACT: Handler for Data::ModeMerge SUBTRACT merge mode |
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__END__ |
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=pod |
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=encoding UTF-8 |
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=head1 NAME |
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Data::ModeMerge::Mode::SUBTRACT - Handler for Data::ModeMerge SUBTRACT merge mode |
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102
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=head1 VERSION |
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This document describes version 0.33 of Data::ModeMerge::Mode::SUBTRACT (from Perl distribution Data-ModeMerge), released on 2016-02-25. |
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=head1 SYNOPSIS |
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use Data::ModeMerge; |
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=head1 DESCRIPTION |
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This is the class to handle SUBTRACT merge mode. |
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=for Pod::Coverage ^merge_.* |
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=head1 HOMEPAGE |
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Please visit the project's homepage at L<https://metacpan.org/release/Data-ModeMerge>. |
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=head1 SOURCE |
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Source repository is at L<https://github.com/perlancar/perl-Data-ModeMerge>. |
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=head1 BUGS |
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Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=Data-ModeMerge> |
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When submitting a bug or request, please include a test-file or a |
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patch to an existing test-file that illustrates the bug or desired |
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feature. |
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=head1 AUTHOR |
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perlancar <perlancar@cpan.org> |
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2016 by perlancar@cpan.org. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |