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package Params::Validate::Dependencies; |
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use strict; |
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use warnings; |
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2563
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use Clone qw(clone); |
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14421
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440
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3207
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use Params::Validate (); # don't import yet |
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49945
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use Params::Validate::Dependencies::Documenter; |
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272
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use Scalar::Util qw(blessed); |
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3066
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use PadWalker qw(closed_over); |
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3864
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463
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12
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use base qw(Exporter); |
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664
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50
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use vars qw($VERSION @EXPORT @EXPORT_OK %EXPORT_TAGS $DOC); |
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1068
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$VERSION = '1.32'; |
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$DOC = 0; |
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# copy and update P::V's EXPORT* constants |
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my @_of = qw(any_of all_of none_of one_of); |
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@EXPORT = (@Params::Validate::EXPORT, @_of); |
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@EXPORT_OK = (@Params::Validate::EXPORT_OK, @_of, 'exclusively'); |
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%EXPORT_TAGS = (%{clone(\%Params::Validate::EXPORT_TAGS)}, _of => \@_of); |
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push @{$EXPORT_TAGS{all}}, (@_of, 'exclusively'); |
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26
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# because repeating the call to _validate_factory_args everywhere is BAD |
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foreach my $sub (@_of, 'exclusively') { |
28
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9
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50
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no strict 'refs'; |
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213
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no warnings 'redefine'; |
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7243
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30
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my $orig = \&{$sub}; |
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*{$sub} = sub { |
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37
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37
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4683
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local *__ANON__ = $sub; |
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127
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_validate_factory_args(@_); |
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36
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116
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$orig->(@_); |
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}; |
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} |
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38
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sub import { |
39
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# import all of P::V except validate() |
40
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12
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12
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61
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Params::Validate->import(grep { $_ ne 'validate' } @Params::Validate::EXPORT_OK); |
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192
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1078
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41
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# now export all that P::V would have exported, plus *_of |
42
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12
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1785
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__PACKAGE__->export_to_level(1, @_); |
43
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} |
44
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45
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=head1 NAME |
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47
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Params::Validate::Dependencies - check that the right combination of arguments is passed to a function |
48
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49
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=head1 DESCRIPTION |
50
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51
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Extends Params::Validate to make it easy to validate |
52
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that you have been passed the correct combinations of parameters. |
53
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54
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=head1 SYNOPSIS |
55
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56
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This example validates that sub 'foo's arguments are of the right types, |
57
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and that either we have at least one of alpha, beta and gamma, or |
58
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we have both of bar amd baz: |
59
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60
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use Params::Validate::Dependencies qw(:all); |
61
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62
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sub foo { |
63
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validate(@_, |
64
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{ |
65
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alpha => { type => ARRAYREF, optional => 1 }, |
66
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beta => { type => ARRAYREF, optional => 1 }, |
67
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gamma => { type => ARRAYREF, optional => 1 }, |
68
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bar => { type => SCALAR, optional => 1 }, |
69
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baz => { type => SCALAR, optional => 1 }, |
70
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}, |
71
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any_of( |
72
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qw(alpha beta gamma), |
73
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all_of(qw(bar baz)), |
74
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) |
75
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); |
76
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} |
77
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78
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=head1 HOW IT WORKS |
79
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80
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Params::Validate::Dependencies extends Params::Validate's |
81
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validate() function to |
82
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support an arbitrary number of callbacks which are not associated |
83
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with any one parameter. All of those callbacks are run after |
84
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Params::Validate's normal validate() function. |
85
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If any of them return false, then validate() will die as normal. |
86
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87
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=head1 SUBROUTINES and EXPORTS |
88
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89
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All of the *_of functions are exported by default in addition to those |
90
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exported by default by Params::Validate. They are also available with the |
91
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tag ':_of' in case you want to use them without Params::Validate. |
92
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In that case you would load the module thus: |
93
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94
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use Params::Validate::Dependencies qw(:_of); |
95
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96
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All of the *_of functions take a list of scalars and code-refs and |
97
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return a code-ref (which is a closure over the list originally passed |
98
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to the function) suitable for use in validate() or in another *_of |
99
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function. All code-refs should take as their only argument a hashref |
100
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of parameters to check, returning true if the parameters are good |
101
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and false otherwise. |
102
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103
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=head2 document |
104
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105
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This takes a code-ref argument as generated by a tree of *_of calls, |
106
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and spits out some documentation of it. This function is not exported. |
107
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108
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=cut |
109
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110
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sub document { |
111
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18
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18
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1
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713
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my $sub = shift; |
112
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18
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100
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66
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203
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die(__PACKAGE__."::document: object $sub is wrong type\n") |
113
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unless(blessed($sub) && $sub->can('_document')); |
114
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17
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63
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$sub->_document(); |
115
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} |
116
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117
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=head2 validate |
118
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119
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Overrides and extends Params::Validate's function of the same name. |
120
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121
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=cut |
122
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123
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sub validate (\@@) { |
124
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44
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44
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1
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10875
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my @args = @{shift()}; |
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44
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114
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125
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44
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79
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my $pv_spec; |
126
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44
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100
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66
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286
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if(ref($_[0]) && ref($_[0]) =~ /HASH/) { |
127
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21
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45
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$pv_spec = shift; |
128
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} |
129
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44
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94
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my @coderefs = @_; |
130
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131
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44
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117
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my %rval = @args; |
132
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# P::V::validate may alter it by applying defaults |
133
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44
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100
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481
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%rval = Params::Validate::validate(@args, $pv_spec) if($pv_spec); |
134
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135
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42
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127
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foreach (@coderefs) { |
136
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41
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100
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149
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die("code-ref checking failed\n") unless($_->({@args})); |
137
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} |
138
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139
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23
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50
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174
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return wantarray ? %rval : \%rval; |
140
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} |
141
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142
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=head2 exclusively |
143
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144
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Takes a single subref as its only argument (this would normally be the |
145
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results of one of the *_of functions), and returns a code-ref which |
146
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returns true if the hashref it is given only contains fields |
147
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mentioned in the original function or any of its children. For example |
148
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... |
149
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150
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validate(@_, |
151
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exclusively( |
152
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any_of( |
153
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qw(alpha beta gamma), |
154
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all_of(qw(bar baz)), |
155
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) |
156
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) |
157
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); |
158
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159
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will not tolerate arguments such as: |
160
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161
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bar => ..., |
162
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baz => ..., |
163
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sheep => ... |
164
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165
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because sheep aren't mentioned in the 'any_of' and 'all_of's. Internally |
166
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this uses the auto-documenter interface to interrogate the child sub. This |
167
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means that if you want to use C with third-party extensions |
168
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then they must support auto-documentation. |
169
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170
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This function is not exported by default but can be. |
171
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172
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=cut |
173
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174
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sub exclusively { |
175
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my @options = @_; |
176
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my $childsub = shift; |
177
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_bless_right_class( |
178
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sub { |
179
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my $documentation = document($childsub); |
180
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if($Params::Validate::Dependencies::DOC) { |
181
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return "exclusively ($documentation)"; |
182
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} |
183
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184
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my @strings = map { |
185
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s/\\'/'/g; $_ |
186
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} $documentation =~ / |
187
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' |
188
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( |
189
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(?:\\'|[^'])+ |
190
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) |
191
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' |
192
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/xg; |
193
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194
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my %params = %{shift()}; |
195
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foreach my $param (keys %params) { |
196
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return 0 if(!grep { $param eq $_ } @strings); |
197
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} |
198
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return 1; |
199
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} |
200
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); |
201
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} |
202
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203
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=head2 none_of |
204
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205
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Returns a code-ref which checks that the hashref it receives matches |
206
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none of the options given. |
207
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208
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You might want to use it thus: |
209
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210
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all_of( |
211
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'alpha', |
212
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none_of(qw(bar baz)) |
213
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) |
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to validate that 'alpha' must *not* be accompanied by 'bar' or 'baz'. |
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=cut |
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sub none_of { |
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my @options = @_; |
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_bless_right_class(_mk_autodoc(sub { _count_of(\@options, 0)->(@_) })); |
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} |
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=head2 one_of |
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Returns a code-ref which checks that the hashref it receives matches |
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only one of the options given. |
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=cut |
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sub one_of { |
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my @options = @_; |
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_bless_right_class(_mk_autodoc(sub { _count_of(\@options, 1)->(@_) })); |
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} |
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=head2 any_of |
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Returns a code-ref which checks that the hashref it receives matches |
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one or more of the options given. |
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=cut |
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sub any_of { |
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my @options = @_; |
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_bless_right_class(_mk_autodoc(sub { |
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my %params = %{shift()}; |
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foreach my $option (@options) { |
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return 1 if(!ref($option) && exists($params{$option})); |
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return 1 if(ref($option) && $option->(\%params)); |
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} |
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return 0; |
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})); |
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} |
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=head2 all_of |
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Returns a code-ref which checks that the hashref it receives matches |
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all of the options given. |
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=cut |
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sub all_of { |
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my @options = @_; |
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_bless_right_class(_mk_autodoc(sub { _count_of(\@options, $#options + 1)->(@_) })); |
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} |
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# {none,one,all}_of are thin wrappers around this |
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sub _count_of { |
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my @options = @{shift()}; |
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my $desired_count = shift; |
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sub { |
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my %params = %{shift()}; |
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53
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my $matches = 0; |
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foreach my $option (@options) { |
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$matches++ if( |
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100
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66
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547
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(!ref($option) && exists($params{$option})) || |
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66
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278
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(ref($option) && $option->(\%params)) |
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); |
280
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} |
281
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53
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382
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return ($matches == $desired_count); |
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} |
283
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53
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233
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} |
284
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285
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sub _mk_autodoc { |
286
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35
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35
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72
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my $sub = shift; |
287
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sub { |
288
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114
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100
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114
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419
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if($DOC) { |
289
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44
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679
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return $DOC->_doc_me(list => (closed_over($sub))[0]->{'@options'}); |
290
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} |
291
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70
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156
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$sub->(@_); |
292
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} |
293
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35
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145
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} |
294
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295
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sub _bless_right_class { |
296
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36
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36
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205
|
my($sub, $class) = (shift(), (caller(1))[3]); |
297
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36
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198
|
(my $subname = $class) =~ s/.*:://; |
298
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9
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9
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62
|
no strict 'refs'; |
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9
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17
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9
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1788
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299
|
36
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100
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75
|
unless(@{"${class}::ISA"}) { |
|
36
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240
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300
|
23
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50
|
@{"${class}::ISA"} = ('Params::Validate::Dependencies::Documenter'); |
|
23
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204
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301
|
23
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50
|
|
79
|
*{"${class}::name"} = sub { $subname }; |
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23
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98
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50
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194
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302
|
23
|
100
|
|
34
|
|
72
|
*{"${class}::join_with"} = sub { $subname eq 'all_of' ? 'and' : 'or' }; |
|
23
|
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82
|
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34
|
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146
|
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303
|
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|
} |
304
|
36
|
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226
|
bless $sub, $class; |
305
|
|
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|
} |
306
|
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307
|
|
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|
|
sub _validate_factory_args { |
308
|
37
|
|
|
37
|
|
105
|
my @options = @_; |
309
|
37
|
|
|
|
|
200
|
my $sub = (caller(1))[3]; |
310
|
|
|
|
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|
|
die("$sub takes only SCALARs, code-refs, and Params::Validate::Dependencies::* objects\n") |
311
|
|
|
|
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|
|
if(grep { |
312
|
37
|
100
|
66
|
|
|
93
|
ref($_) && ref($_) !~ /CODE/ && |
|
87
|
100
|
100
|
|
|
613
|
|
313
|
|
|
|
|
|
|
!(blessed($_) && $_->isa('Params::Validate::Dependencies::Documenter')) |
314
|
|
|
|
|
|
|
} @options); |
315
|
|
|
|
|
|
|
} |
316
|
|
|
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|
317
|
|
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|
|
=head1 LIES |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
Some of the above is incorrect. If you really want to know what's |
320
|
|
|
|
|
|
|
going on, look at L. |
321
|
|
|
|
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|
|
|
322
|
|
|
|
|
|
|
=head1 BUGS, LIMITATIONS, and FEEDBACK |
323
|
|
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|
|
324
|
|
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|
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|
|
I like to know who's using my code. All comments, including constructive |
325
|
|
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|
|
criticism, are welcome. |
326
|
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327
|
|
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|
|
Please report any bugs either by email or using L |
328
|
|
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|
|
or at L. |
329
|
|
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|
330
|
|
|
|
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|
|
Any incompatibility with Params::Validate will be considered to be a bug, |
331
|
|
|
|
|
|
|
with the exception of minor differences in error messages. |
332
|
|
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|
333
|
|
|
|
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|
|
Bug reports should contain enough detail that I can replicate the |
334
|
|
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|
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|
|
problem and write a test. The best bug reports have those details |
335
|
|
|
|
|
|
|
in the form of a .t file. If you also include a patch I will love |
336
|
|
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|
|
|
|
you for ever. |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
=head1 SEE ALSO |
339
|
|
|
|
|
|
|
|
340
|
|
|
|
|
|
|
L |
341
|
|
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|
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|
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342
|
|
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|
|
|
|
L |
343
|
|
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|
344
|
|
|
|
|
|
|
=head1 SOURCE CODE REPOSITORY |
345
|
|
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346
|
|
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|
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|
|
L |
347
|
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348
|
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|
L |
349
|
|
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|
350
|
|
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|
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|
|
=head1 COPYRIGHT and LICENCE |
351
|
|
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|
352
|
|
|
|
|
|
|
Copyright 2016 David Cantrell EFE |
353
|
|
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|
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|
354
|
|
|
|
|
|
|
This software is free-as-in-speech software, and may be used, distributed, and modified under the terms of either the GNU General Public Licence version 2 or the Artistic Licence. It's up to you which one you use. The full text of the licences can be found in the files GPL2.txt and ARTISTIC.txt, respectively. |
355
|
|
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|
356
|
|
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|
|
=head1 CONSPIRACY |
357
|
|
|
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|
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|
|
358
|
|
|
|
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|
|
This module is also free-as-in-mason. |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
=cut |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
1; |