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package Articulate::Syntax; |
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20060
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use strict; |
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13
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10
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290
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use warnings; |
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13
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210
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5
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36
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use Scalar::Util qw(blessed); |
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11
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10
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2122
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6
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4998
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use Module::Load (); |
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9289
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10
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189
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7
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8
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4954
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use Exporter::Declare; |
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196741
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10
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42
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default_exports qw( |
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instantiate instantiate_array instantiate_selection instantiate_array_selection |
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response articulate_request |
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credentials permission |
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loc locspec |
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dpath_get dpath_set |
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hash_merge |
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throw_error |
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select_from |
18
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is_single_key_hash |
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); |
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21
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10
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16287
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use Articulate::Error; |
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28
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10
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69
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22
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10
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10
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10311
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use Data::DPath qw(dpath dpathr); |
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10
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1111371
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10
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73
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23
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10
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10
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8559
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use Hash::Merge (); |
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21170
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10
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250
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24
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25
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66
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use Articulate::Error; |
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13
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10
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89
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26
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10
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10
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7655
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use Articulate::Credentials; |
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31
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10
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45
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27
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10
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10
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7009
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use Articulate::File; |
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112
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10
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277
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28
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10
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10
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2546
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use Articulate::Item; |
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29
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10
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288
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29
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10
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10
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3673
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use Articulate::Location; |
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22
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10
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40
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30
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10
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10
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6733
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use Articulate::LocationSpecification; |
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30
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10
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35
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31
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10
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10
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6692
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use Articulate::Permission; |
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27
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10
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39
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32
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10
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10
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6901
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use Articulate::Request; |
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39
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10
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43
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33
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10
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10
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4773
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use Articulate::Response; |
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23
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10
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114
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34
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35
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# sub throw_error { Articulate::Error::throw_error(@_) }; |
36
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# sub loc { Articulate::Location::loc(@_) }; |
37
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38
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=head3 instantiate_array |
39
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40
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C accepts an arrayref of values which represent objects. For each value, if it is not an object, it will attempt to instantiate one using C. |
41
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42
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If you pass C a value which is not an arrayref, it will assume you meant to give it an arrayref with a single item; or, if you pass it C, it will return an empty arrayref. |
43
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44
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The purpose of this function is to enable the following: |
45
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46
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package Articulate::SomeDelegatingComponent; |
47
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use Moo; |
48
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has delegates_to => |
49
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is => 'rw', |
50
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default => sub { [] }, |
51
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coerce => sub{ instantiate_array(@_) }; |
52
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53
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Which means given config like the following: |
54
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55
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Articulate::SomeDelegatingComponent: |
56
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delegates_to: |
57
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- My::Validation::For::Articles |
58
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- class: My::Validation::For::Images |
59
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args: |
60
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- max_width: 1024 |
61
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max_height: 768 |
62
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- class: My::Validation::For::Documents |
63
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constructor: preset |
64
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args: pdf |
65
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66
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You can be guaranteed that looping through C<< @{ $self->delegates_to } >> will always produce objects. |
67
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68
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=head3 instantiate |
69
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70
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Attempts to create an object from the hashref or class name provided. |
71
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72
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If the value is a string, it will treat as a class name, and perform C<< $class->new >>, or, if the method exists, C<< $class->instance >> will be preferred (for instance, as provided by C). |
73
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74
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If the value is a hashref, it will look at the values for the keys C, C, and C. It will then attempt to perform C<< $class->$constructor(@$args) >>, unless the constructor is absent (in which case C or C will be supplied), or if C is not an arrayref, in which case it will be passed to the constructor as a single argument (or the empty list will be passed if C is undefined). |
75
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76
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If the value is an object, the object will simply be returned. |
77
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78
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=cut |
79
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80
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sub instantiate { |
81
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350
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350
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1
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6523
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my $original = shift; |
82
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350
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100
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1092
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if ( blessed $original ) { |
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100
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50
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83
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210
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550
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return $original; |
84
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} |
85
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elsif ( !ref $original ) { |
86
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86
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305
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Module::Load::load($original); |
87
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86
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100
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3424
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if ( $original->can('instance') ) { |
88
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1
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4
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return $original->instance(); |
89
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} |
90
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else { |
91
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85
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461
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return $original->new(); |
92
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} |
93
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} |
94
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elsif ( ref $original eq ref {} ) { |
95
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54
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85
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my $class = $original->{class}; |
96
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54
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73
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my $args = $original->{args}; |
97
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54
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100
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100
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506
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if ( 1 == keys %$original and join( '', keys %$original ) !~ /^[a-z_]/ ) |
98
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{ # single key that looks like a class |
99
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41
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96
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$class = join '', keys %$original; |
100
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41
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95
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$args = $original->{$class}; |
101
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} |
102
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54
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50
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153
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throw_error Internal => 'Instantiation failed: expecting key class, got ' |
103
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. ( join ', ', keys %$original ) |
104
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unless defined $class; |
105
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54
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167
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Module::Load::load($class); |
106
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54
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100
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66
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4052
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my $constructor = $original->{constructor} |
107
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// ( $class->can('instance') ? 'instance' : 'new' ); |
108
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54
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100
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245
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my @args = ( |
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100
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109
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( defined $args ) |
110
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? ( ref $args eq ref [] ) |
111
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? @$args |
112
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: $args |
113
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: () |
114
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); |
115
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54
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242
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return $class->$constructor(@args); |
116
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} |
117
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} |
118
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119
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sub instantiate_array { |
120
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73
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73
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1
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3576
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my $arrayref = shift; |
121
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73
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50
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226
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return [] unless defined $arrayref; |
122
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123
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# delegates_to => "Class::Name" should be interpreted as delegates_to => ["Class::Name"] |
124
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73
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100
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100
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367
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$arrayref = [$arrayref] unless ref $arrayref and ref $arrayref eq ref []; |
125
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73
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337
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return [ map { instantiate $_ } @$arrayref ]; |
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106
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4250
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126
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} |
127
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128
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=head3 from_meta |
129
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130
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sub email_address { from_meta (shift, 'schema/user/email_address'); } |
131
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132
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This method uses Data::DPath to retrieve a field from the metadata structure. |
133
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134
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=cut |
135
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136
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sub from_meta { |
137
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0
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0
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1
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0
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my $structure = shift; |
138
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0
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0
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my $item = shift; |
139
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0
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0
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my @results = dpath( $item->meta )->match($structure); |
140
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0
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0
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return shift @results; |
141
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} |
142
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143
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=head3 dpath_get |
144
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145
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my $value = dpath_get($structure, '/path/in/structure'); |
146
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147
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=cut |
148
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149
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sub dpath_get { |
150
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23
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23
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1
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1856
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my $structure = shift; |
151
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23
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26
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my $path = shift; |
152
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23
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245
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my @results = dpath($path)->match($structure); |
153
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23
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5502
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return shift @results; |
154
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} |
155
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156
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=head3 dpath_set |
157
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158
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dpath_set($structure, '/path/in/structure', $value); |
159
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160
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=cut |
161
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162
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sub dpath_set { |
163
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1
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1
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1
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2
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my $structure = shift; |
164
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1
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1
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my $path = shift; |
165
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1
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4
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my $value = shift; |
166
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1
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5
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my @results = dpathr($path)->match($structure); |
167
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1
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232
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map { $$_ = $value } @results; |
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2
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4
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168
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1
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50
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6
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return $value if @results; |
169
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} |
170
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171
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=head3 instantiate_selection |
172
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173
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# in config: |
174
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175
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rules: |
176
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default: |
177
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alias: main_schema |
178
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main_schema: |
179
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dsn: 'csv:main.csv' |
180
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utf8: 1 |
181
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182
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has schemata => |
183
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is => 'rw', |
184
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default => sub { {} }, |
185
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coerce => sub { instantiate_selection @_ }; |
186
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187
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Expects a hash. If any of the values are single-key hashes with the key 'alias' then the alias is resolved. Otherwise the value is instantiated. |
188
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189
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If a value other than a hash is given, returns a hash with the key 'default' and the original value instantiated. |
190
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191
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=cut |
192
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193
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sub instantiate_selection { |
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my $orig = shift; |
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_instantiate_selection( $orig, \&instantiate ); |
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} |
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=head3 instantiate_array_selection |
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200
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rules: |
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default: |
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alias: two_rules |
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two_rules: |
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- Some::Rule |
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- Some::Other::Rule |
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has rules => |
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is => 'rw', |
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default => sub { {} }, |
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coerce => sub { instantiate_array_selection @_ }; |
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Expects a hash. If any of the values are single-key hashes with the key 'alias' then the alias is resolved. Otherwise the value is instantiated as an array (see C). |
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If a value other than a hash is given, returns a hash with the key 'default' and the original value instantiated as an array. |
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=cut |
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sub instantiate_array_selection { |
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my $orig = shift; |
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_instantiate_selection( $orig, \&instantiate_array ); |
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} |
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sub _instantiate_selection { |
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my $orig = shift; |
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my $instantiate = shift; |
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if ( ref $orig eq ref {} ) { |
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for my $i ( 1 .. 5 ) { |
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foreach my $this ( keys %$orig ) { |
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my $got = $orig->{$this}; |
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if ( is_single_key_hash( $got, 'alias' ) ) { |
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$orig->{$this} = $orig->{ $got->{alias} } if $i > 1; |
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} |
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else { |
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$orig->{$this} = $instantiate->($got); |
235
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} |
236
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} |
237
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} |
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107
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return $orig; |
239
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} |
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else { |
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return { default => $instantiate->($orig) }; |
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} |
243
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} |
244
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245
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=head3 select_from |
246
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247
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# given this config: |
248
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249
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schemata: |
250
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default: |
251
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"[Complicated] configuration: can_be->[string, hash, whatever]" |
252
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schema_generic: |
253
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alias: default |
254
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255
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# if your class has |
256
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sub schema { select_from schemata => @_ } |
257
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258
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# then you can do |
259
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$self->schema; |
260
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$self->schema('default'); # same thing |
261
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$self->schema('schema_generic'); # same thing, because of alias |
262
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$self->schemata->{default}; # This is what they all do in practice |
263
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264
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Implements a user-friendly selection mechanism like the one implemented by C. |
265
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266
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=cut |
267
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268
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|
|
sub select_from { |
269
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0
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|
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0
|
1
|
0
|
my ( $attribute, $self, $which ) = @_; |
270
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0
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0
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0
|
$which //= 'default'; |
271
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0
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|
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|
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0
|
my $this = $which; |
272
|
0
|
|
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|
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0
|
my $selectables = $self->$attribute; |
273
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0
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|
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|
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0
|
for ( 1 .. 5 ) { # if more than this then you probably have recusion |
274
|
0
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|
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|
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0
|
my $got = $selectables->{$this}; |
275
|
0
|
0
|
|
|
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0
|
if ( is_single_key_hash( $got, 'alias' ) ) { |
276
|
0
|
|
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|
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0
|
$this = $got->{alias}; |
277
|
0
|
|
|
|
|
0
|
next; |
278
|
|
|
|
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|
|
} |
279
|
0
|
|
|
|
|
0
|
return $got; |
280
|
|
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|
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|
|
} |
281
|
|
|
|
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|
|
} |
282
|
|
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283
|
|
|
|
|
|
|
=head3 is_single_key_hash |
284
|
|
|
|
|
|
|
|
285
|
|
|
|
|
|
|
is_single_key_hash ( { foo => 123 } ); # returns 1 |
286
|
|
|
|
|
|
|
is_single_key_hash ( { foo => 123 }, 'foo' ); # returns 1 |
287
|
|
|
|
|
|
|
is_single_key_hash ( { foo => 123 }, 'bar' ); # returns 0 |
288
|
|
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|
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|
|
|
289
|
|
|
|
|
|
|
Returns 1 if the first argument is a hashref with exactly one key. If a second argument is provided, then the key, if it exists, must be equal to that argument, or the return value will be 0. |
290
|
|
|
|
|
|
|
|
291
|
|
|
|
|
|
|
=cut |
292
|
|
|
|
|
|
|
|
293
|
|
|
|
|
|
|
sub is_single_key_hash { |
294
|
257
|
|
|
257
|
1
|
1617
|
my $got = shift; |
295
|
257
|
|
|
|
|
226
|
my $key = shift; |
296
|
257
|
100
|
100
|
|
|
1662
|
return 1 |
|
|
|
100
|
|
|
|
|
|
|
|
100
|
|
|
|
|
297
|
|
|
|
|
|
|
if (defined $key |
298
|
|
|
|
|
|
|
and ref $got eq ref {} |
299
|
|
|
|
|
|
|
and 1 == scalar keys %$got |
300
|
|
|
|
|
|
|
and $key eq [ keys %$got ]->[0] ); |
301
|
246
|
100
|
100
|
|
|
532
|
return 1 |
|
|
|
100
|
|
|
|
|
302
|
|
|
|
|
|
|
if ( !defined $key and ref $got eq ref {} and 1 == scalar keys %$got ); |
303
|
245
|
|
|
|
|
469
|
return 0; |
304
|
|
|
|
|
|
|
} |
305
|
|
|
|
|
|
|
|
306
|
|
|
|
|
|
|
=head3 hash_merge |
307
|
|
|
|
|
|
|
|
308
|
|
|
|
|
|
|
my $merged = hash_merge ($parent, $child) |
309
|
|
|
|
|
|
|
|
310
|
|
|
|
|
|
|
Returns a new hashref whose values represent a union of the parent's and the child's. The child's values overwrite the parent, in case of conflict. The merge is deep (i.e. it handles nested hashes), using L with right precedence. |
311
|
|
|
|
|
|
|
|
312
|
|
|
|
|
|
|
=cut |
313
|
|
|
|
|
|
|
|
314
|
|
|
|
|
|
|
my $hash_merger = Hash::Merge->new('RIGHT_PRECEDENT'); |
315
|
|
|
|
|
|
|
|
316
|
|
|
|
|
|
|
sub hash_merge { # very naive, will change to something like Hash::Merge |
317
|
0
|
|
|
0
|
1
|
|
my ( $parent, $child ) = @_; |
318
|
0
|
|
|
|
|
|
return $hash_merger->merge( $parent, $child ); # todo: more |
319
|
|
|
|
|
|
|
} |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
1; |