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package Data::Enum; |
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# ABSTRACT: immutable enumeration classes |
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677
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use v5.10; |
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use strict; |
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14
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use warnings; |
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18
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10
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1
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416
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use Package::Stash; |
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9448
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5
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use List::Util 1.45 qw/ any uniqstr /; |
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86
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use Scalar::Util qw/ blessed refaddr /; |
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1
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13
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# RECOMMEND PREREQ: Package::Stash::XS |
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use overload (); |
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631
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our $VERSION = 'v0.2.5'; |
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sub new { |
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1318
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my $this = shift; |
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25
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5
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my @values = uniqstr( sort map { "$_" } @_ ); |
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100
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die "has no values" unless @values; |
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29
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100
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die "values must be alphanumeric" if any{ /\W/ } @values; |
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31
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3
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my $key = join chr(28), @values; |
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33
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3
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state %Cache; |
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3
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state $Counter = 1; |
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36
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37
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3
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100
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if ( my $name = $Cache{$key} ) { |
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1
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return $name; |
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} |
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41
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2
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5
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my $name = "Data::Enum::" . $Counter++; |
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43
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2
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18
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my $base = Package::Stash->new($name); |
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45
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my $_make_symbol = sub { |
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6
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6
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8
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my ($value) = @_; |
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6
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11
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my $self = bless \$value, "${name}::${value}"; |
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6
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11
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Internals::SvREADONLY($value, 1); |
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6
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return $self; |
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2
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}; |
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52
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my $_make_predicate = sub { |
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9
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my ($value) = @_; |
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9
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24
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return "is_" . $value; |
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2
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4
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}; |
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57
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$base->add_symbol( |
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'&new', |
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sub { |
60
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19
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19
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1123
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my ( $class, $value ) = @_; |
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state $symbols = { |
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map { |
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19
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22
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$_ => $_make_symbol->($_) |
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6
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10
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64
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} @values |
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}; |
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19
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100
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47
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exists $symbols->{"$value"} or die "invalid value: '$value'"; |
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18
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95
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return $symbols->{"$value"}; |
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} |
69
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2
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38
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); |
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71
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2
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2
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12
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$base->add_symbol( '&values', sub { return @values }); |
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2
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12
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72
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73
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2
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1
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11
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$base->add_symbol( '&predicates', sub { return map { $_make_predicate->($_) } @values } ); |
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1
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2
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3
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4
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74
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75
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$name->overload::OVERLOAD( |
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6
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6
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179
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q{""} => sub { my ($self) = @_; return $$self; }, |
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6
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26
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77
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q{eq} => sub { |
78
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10
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10
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736
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my ( $self, $arg ) = @_; |
79
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10
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100
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82
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return blessed($arg) |
80
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? refaddr($arg) == refaddr($self) |
81
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: $arg eq $$self; |
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}, |
83
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q{ne} => sub { |
84
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7
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7
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426
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my ( $self, $arg ) = @_; |
85
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7
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100
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54
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return blessed($arg) |
86
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? refaddr($arg) != refaddr($self) |
87
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: $arg ne $$self; |
88
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}, |
89
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2
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15
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); |
90
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91
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2
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81
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for my $value (@values) { |
92
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6
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13
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my $predicate = $_make_predicate->($value); |
93
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6
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32
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$base->add_symbol( '&' . $predicate, sub() { '' } ); |
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6
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12
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my $elem = "${name}::${value}"; |
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6
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26
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my $subtype = Package::Stash->new($elem); |
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6
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49
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$subtype->add_symbol( '@ISA', [$name] ); |
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6
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47
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$subtype->add_symbol( '&' . $predicate, sub() { 1 } ); |
98
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} |
99
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100
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2
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9
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return $Cache{$key} = $name; |
101
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} |
102
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103
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104
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1; |
105
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106
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__END__ |