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use 5.006; |
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use strict; |
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27
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3
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use warnings; |
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89
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4
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5
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package LINQ::FieldSet::Single; |
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7
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our $AUTHORITY = 'cpan:TOBYINK'; |
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our $VERSION = '0.002'; |
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10
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1
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1
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8
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use Class::Tiny; |
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2
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1
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11
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1
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98
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use parent qw( LINQ::FieldSet ); |
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1
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10
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13
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use overload ( |
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'fallback' => !!1, |
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0
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0
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0
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q[bool] => sub { !! 1 }, |
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1
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q[""] => 'to_string', |
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q[&{}] => 'coderef', |
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1
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1
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101
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); |
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4
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19
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20
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sub new { |
21
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4
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4
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1
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9
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my $class = shift; |
22
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4
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8
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my $field = shift; |
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4
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31
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my $self = $class->SUPER::new( $field ); |
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25
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4
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50
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79
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if ( wantarray ) { |
26
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4
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31
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return ( $self, @_ ); |
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} |
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29
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0
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0
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0
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if ( @_ ) { |
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0
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0
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LINQ::Util::Internal::throw( |
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'CallerError', |
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'message' => 'Unexpected extra parameters; single field name expected', |
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); |
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} |
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36
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0
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0
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return $self; |
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} |
38
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39
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sub coderef { |
40
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24
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24
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1
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42
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my ( $self ) = ( shift ); |
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24
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66
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79
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$self->{coderef} ||= $self->_build_coderef; |
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} |
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44
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sub _build_coderef { |
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4
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4
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8
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my ( $self ) = ( shift ); |
46
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4
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9
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my ( $field ) = @{ $self->fields }; |
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4
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152
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47
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4
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39
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return $field->getter; |
48
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} |
49
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50
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sub to_string { |
51
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0
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0
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1
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my ( $self ) = ( shift ); |
52
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0
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sprintf 'field(%s)', join q[, ], map $_->name, @{ $self->fields }; |
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0
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53
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} |
54
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55
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1; |
56
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57
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__END__ |
58
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59
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=pod |
60
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61
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=encoding utf-8 |
62
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63
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=head1 NAME |
64
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65
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LINQ::FieldSet::Single - similar to LINQ::FieldSet::Selection, but only selects one field |
66
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67
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=head1 DESCRIPTION |
68
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69
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LINQ::FieldSet::Single is a subclass of L<LINQ::FieldSet>. |
70
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71
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This is used internally by LINQ and you probably don't need to know about it |
72
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unless you're writing very specific extensions for LINQ. The end user |
73
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interface is the C<field> function in L<LINQ::Util>. |
74
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75
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=head1 CONSTRUCTOR |
76
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77
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=over |
78
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79
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=item C<< new( NAME, EXTRAARGS ) >> |
80
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81
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Constructs a fieldset like: |
82
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83
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'LINQ::FieldSet::Single'->new( 'name', @stuff ); |
84
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85
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If called in scalar context, and C<< @stuff >> isn't the empty list, then |
86
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will throw an exception. |
87
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88
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If called in list context, will return the newly constructed object followed |
89
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by unadulterated C<< @stuff >>. |
90
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91
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=back |
92
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93
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=head1 METHODS |
94
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95
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=over |
96
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97
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=item C<coderef> |
98
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99
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Gets a coderef for this assertion; the coderef operates on C<< $_ >>. |
100
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101
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=item C<to_string> |
102
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103
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Basic string representation of the fieldset. |
104
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105
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=back |
106
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107
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=head1 OVERLOADING |
108
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109
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This class overloads |
110
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C<< "" >> to call the C<< to_string >> method and |
111
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C<< &{} >> to call the C<< coderef >> method. |
112
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113
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=head1 BUGS |
114
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115
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Please report any bugs to |
116
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L<http://rt.cpan.org/Dist/Display.html?Queue=LINQ>. |
117
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118
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=head1 SEE ALSO |
119
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120
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L<LINQ::FieldSet>, L<LINQ::Util>. |
121
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122
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=head1 AUTHOR |
123
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124
|
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|
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Toby Inkster E<lt>tobyink@cpan.orgE<gt>. |
125
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126
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=head1 COPYRIGHT AND LICENCE |
127
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128
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This software is copyright (c) 2021 by Toby Inkster. |
129
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130
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This is free software; you can redistribute it and/or modify it under |
131
|
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|
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the same terms as the Perl 5 programming language system itself. |
132
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133
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=head1 DISCLAIMER OF WARRANTIES |
134
|
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135
|
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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED |
136
|
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WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
137
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MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |