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package exported::constants; |
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3
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1
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1
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15657
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use strict; |
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1
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1
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1
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22
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4
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1
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1
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3
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use warnings; |
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1
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2
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1
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39
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5
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6
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1
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1
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3
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use vars '$VERSION'; $VERSION = '1.0'; |
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1
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5
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1
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33
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7
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8
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1
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1
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3
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use Carp qw/ carp /; |
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1
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0
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1
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59
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9
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10
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sub import { |
11
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1
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1
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6
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my ($class, @args) = @_; |
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13
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1
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2
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my $pkg = caller(); |
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15
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1
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1
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4
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no strict 'refs'; |
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1
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1
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1
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135
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16
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17
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1
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50
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2
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push @{$pkg.'::ISA'}, 'Exporter' unless grep { $_ eq 'Exporter' } @{$pkg.'::ISA'}; |
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1
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6
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0
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0
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1
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7
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18
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19
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1
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3
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while (@args) { |
20
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2
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50
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4
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carp "Last constant $args[0] is missing a definition" unless @args >= 2; |
21
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22
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2
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3
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my ($name, $value) = splice @args, 0, 2; |
23
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24
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2
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0
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9
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*{$pkg.'::'.$name} = sub () { $value }; |
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2
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7
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0
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0
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25
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26
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2
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1
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push @{$pkg.'::EXPORT'}, $name; |
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2
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41
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27
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} |
28
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} |
29
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30
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1; |
31
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32
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=head1 NAME |
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34
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exported::constants - Declare constants and export them automatically |
35
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36
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=head1 SYNOPSIS |
37
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38
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package MyProg::Constants; |
39
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40
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use exported::constants |
41
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USER_TYPE_USER => 'U', |
42
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USER_TYPE_APPLICATION => 'A', |
43
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USER_TYPE_ROBOT => 'B', |
44
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; |
45
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46
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package MyProg::App; |
47
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48
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use MyProg::Constants; |
49
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50
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my @real_users = $users->search({ user_type => USER_TYPE_USER, }); |
51
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52
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=head1 DESCRIPTION |
53
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54
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This is a boilerplate-removal module for creating modules of just constants in your program. |
55
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This is useful if you have a lot of magic numbers you want to eliminate, |
56
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especially things that show up in database schemas or APIs that you want to re-use across multiple modules. |
57
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58
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It's pretty simple to use; |
59
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just say |
60
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61
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use exported::constants |
62
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CONSTANT1 => $value1, |
63
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CONSTANT2 => $value2, |
64
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; |
65
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66
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and your package is automatically an exporter, |
67
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and automatically exports (by default) all the constants listed. |
68
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69
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=head1 RESTRICTIONS |
70
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71
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=over |
72
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73
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=item * List constants don't work, because C is intended to always create multiple constants in a single invocation. |
74
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75
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=item * This module always works using C<@EXPORT> in L; this is unfortunate for developers who want to explicitly import all their constants. |
76
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77
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=back |
78
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79
|
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=head1 SEE ALSO |
80
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81
|
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=over |
82
|
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83
|
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=item * L |
84
|
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85
|
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=item * L |
86
|
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87
|
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=back |
88
|
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89
|
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=head1 AUTHOR |
90
|
|
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|
|
|
91
|
|
|
|
|
|
|
Jonathan Cast |
92
|
|
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93
|
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=head1 COPYRIGHT AND LICENSE |
94
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95
|
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|
Copyright 2017 Jonathan Cast |
96
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97
|
|
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|
|
Licensed under the Apache License, Version 2.0 (the "License"). |