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package constant::abs; |
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40733
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use strict; |
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use warnings; |
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55
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use constant (); |
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103
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828
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BEGIN { defined &DEBUG or *DEBUG = sub () { 0 } } |
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9
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=head1 NAME |
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11
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constant::abs - Perl pragma to declare previously constants using absolute name |
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=head1 VERSION |
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Version 0.01 |
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=cut |
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our $VERSION = '0.01'; |
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=head1 SYNOPSIS |
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Define compile-time constant using full package name. |
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The main reason is to use for forward definition of debugging constants. |
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Created as an addition for C |
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28
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# complex way |
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# in main.pl |
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BEGIN { *My::Module::Debug = sub () { 1 }; } |
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use My::Module; |
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################ |
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35
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# using this distribution |
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# in main.pl |
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use constant::abs 'My::Module::DEBUG' => 1; |
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use My::Module; |
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40
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Syntax is fully compatible with C |
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=cut |
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44
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sub import { |
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4
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4
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4098
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my $class = shift; |
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4
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100
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25
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return unless @_; |
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3
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6
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my $pkg = caller; |
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48
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3
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5
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my %const; |
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3
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100
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10
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if (ref $_[0] eq 'HASH') { |
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1
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2
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%const = map { $_ => [ $_[0]->{$_} ] } keys %{$_[0]}; |
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1
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7
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1
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5
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51
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} else { |
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2
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%const = ( $_[0] => [ @_ ? @_[1..$#_] : () ] ); |
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} |
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3
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10
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for ( keys %const ) { |
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3
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20
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my ($pkg,$name) = $_ =~ m{^(?:(.+?)::|)([^:]+)$}; |
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3
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6
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my @val = @{ $const{$_} }; |
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3
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9
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57
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3
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$pkg ||= 'main'; |
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3
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4
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DEBUG and warn "Abs definition for $pkg : $name = @val"; |
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3
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217
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eval qq{ |
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package $pkg; |
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constant::import( constant => \$name, \@val ); |
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}; |
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3
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100
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15
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if (local $_ = $@) { |
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1
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5
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s{at \(eval \d+\) line \d+\s*$}{}; |
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65
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1
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8
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require Carp; |
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1
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123
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Carp::croak($_); |
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67
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} |
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2
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warn if $@; |
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69
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} |
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2
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99
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return; |
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71
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} |
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72
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73
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74
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=head1 SEE ALSO |
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75
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76
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L, L |
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77
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78
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=head1 AUTHOR |
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79
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80
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Mons Anderson, C<< >> |
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81
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82
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=head1 COPYRIGHT & LICENSE |
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83
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84
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Copyright 2009 Mons Anderson. |
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85
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86
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This program is free software; you can redistribute it and/or modify it |
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87
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under the same terms as Perl itself. |
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88
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89
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90
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=cut |
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91
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92
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1; # End of constant::abs |