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package Refine; |
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=head1 NAME |
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Refine - Refine an instance with new methods |
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=head1 VERSION |
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0.01 |
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=head1 DESCRIPTION |
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L is a module that export C<$_refine> which can be used to add |
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methods object instances. Each C<$_refine> call on the object will create a |
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new class with the new refined methods and rebless the instance into that |
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class, which keeps the original class as it was. |
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This is an EXPERIMENTAL release. The class generator might change in future releases. |
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=head1 SYNOPSIS |
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use Refine; |
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use Data::Dumper (); |
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my $obj = Some::Class->new; |
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# add the dump() method to the $obj instance |
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$obj->$_refine( |
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dump => sub { Data::Dumper->new([$_[0])->Terse(1)->SortKeys(1)->Dump }, |
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); |
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=head1 OPTIONAL MODULES |
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=over 4 |
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=item * Sub::Name |
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If you have L installed, the methods will have proper names, |
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instead of "__ANON__". This will make stacktraces easier to read. |
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=back |
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=cut |
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use strict; |
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use warnings; |
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use Carp (); |
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use constant SUB_NAME => eval 'require Sub::Name;1' ? 1 : 0; |
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use base 'Exporter'; |
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our $VERSION = '0.01'; |
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our @EXPORT = '$_refine'; |
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my %PRIVATE2PUBLIC; |
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our $_refine = sub { |
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my ($self, %patch) = @_; |
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my $class = ref $self; |
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my $private_name = join ':', $class, map { $_, $patch{$_} } sort keys %patch; |
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my $refined_class = $PRIVATE2PUBLIC{$private_name}; |
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unless ($class) { |
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Carp::confess("Can only add methods to instances, not $self"); |
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} |
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unless ($refined_class) { |
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my $base_class = $class; |
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if ($class =~ s!::WITH::(.*)!!) { |
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$patch{$_} ||= '' for grep { !/^_\d+$/ } split /::/, $1; |
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} |
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my $i = 0; |
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my $public_name = substr +("$class\::WITH::" .join '::', sort keys %patch), 0, 180; |
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do { |
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$refined_class = "$public_name\::_$i"; |
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$i++; |
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} while ($refined_class->can('new')); |
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$PRIVATE2PUBLIC{$private_name} = $refined_class; |
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eval "package $refined_class;use base '$base_class';1" or Carp::confess("Failed to refine $class: $@"); |
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555
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for my $n (grep { $patch{$_} } keys %patch) { |
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no strict 'refs'; |
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*{"$refined_class\::$n"} = SUB_NAME ? Sub::Name::subname("$refined_class\::$n", $patch{$n}) : $patch{$n}; |
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} |
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} |
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no strict 'refs'; |
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bless $self, $refined_class; |
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$self; |
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}; |
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=head1 COPYRIGHT AND LICENSE |
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Copyright (C) 2014, Jan Henning Thorsen |
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This program is free software, you can redistribute it and/or modify it under |
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the terms of the Artistic License version 2.0. |
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101
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=head1 AUTHOR |
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Jan Henning Thorsen - C |
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=cut |
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1; |