CFRANKS / HTML-FormFu-2.07 / lib / HTML / FormFu / Role / NestedHashUtils.pm 

            

              
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
—
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

              
use strict;
package HTML::FormFu::Role::NestedHashUtils;
# ABSTRACT: role for nested hashes
$HTML::FormFu::Role::NestedHashUtils::VERSION = '2.07';
use Moose::Role;
use HTML::FormFu::Util qw( split_name );
use Carp qw( croak );
sub get_nested_hash_value {
    my ( $self, $param, $name ) = @_;
    my ( $root, @names ) = split_name($name);
    if ( !@names ) {
        return exists $param->{$root} ? $param->{$root} : undef;
    }
    my $ref = \$param->{$root};
    for (@names) {
        if (/^(0|[1-9][0-9]*)\z/) {
            croak "nested param clash for ARRAY $root"
                if ref $$ref ne 'ARRAY';
            return if $1 > $#{$$ref};
            $ref = \( $$ref->[$1] );
        }
        else {
            return if ref $$ref ne 'HASH' || !exists $$ref->{$_};
            $ref = \( $$ref->{$_} );
        }
    }
    return $$ref;
}
sub set_nested_hash_value {
    my ( $self, $param, $name, $value ) = @_;
    my ( $root, @names ) = split_name($name);
    if ( !@names ) {
        return $param->{$root} = $value;
    }
    my $ref = \$param->{$root};
    for (@names) {
        if (/^(0|[1-9][0-9]*)\z/) {
            $$ref = [] if !defined $$ref;
            croak "nested param clash for ARRAY $name"
                if ref $$ref ne 'ARRAY';
            $ref = \( $$ref->[$1] );
        }
        else {
            $$ref = {} if !defined $$ref;
            croak "nested param clash for HASH $name"
                if ref $$ref ne 'HASH';
            $ref = \( $$ref->{$_} );
        }
    }
    $$ref = $value;
}
sub delete_nested_hash_key {
    my ( $self, $param, $name ) = @_;
    my ( $root, @names ) = split_name($name);
    if ( !@names ) {
        delete $param->{$root};
        return;
    }
    my $ref = \$param->{$root};
    for my $i ( 0 .. $#names ) {
        my $name = $names[$i];
        if ( $name =~ /^(0|[1-9][0-9]*)\z/ ) {
            return if !defined $$ref;
            croak "nested param clash for ARRAY $name"
                if ref $$ref ne 'ARRAY';
            $ref = \( $$ref->[$1] );
            if ( $i == $#names ) {
                croak "can't delete hash key for an array";
            }
        }
        else {
            return if !defined $$ref;
            croak "nested param clash for HASH $name"
                if ref $$ref ne 'HASH';
            if ( $i == $#names ) {
                delete $$ref->{$name};
            }
            else {
                $ref = \( $$ref->{$name} );
            }
        }
    }
    return;
}
sub nested_hash_key_exists {
    my ( $self, $param, $name ) = @_;
    my ( $root, @names ) = split_name($name);
    if ( !@names ) {
        return ( defined($root) && exists( $param->{$root} ) );
    }
    my $ref = \$param->{$root};
    for my $i ( 0 .. $#names ) {
        my $part = $names[$i];
        if ( $part =~ /^(0|[1-9][0-9]*)\z/ ) {
            croak "nested param clash for ARRAY $root"
                if ref $$ref ne 'ARRAY';
            if ( $i == $#names ) {
                return $1 > $$ref->[$1] ? 1 : 0;
            }
            $ref = \( $$ref->[$1] );
        }
        else {
            if ( $i == $#names ) {
                return if !ref $$ref || ref($$ref) ne 'HASH';
                return exists $$ref->{$part} ? 1 : 0;
            }
            $ref = \( $$ref->{$part} );
        }
    }
    return;
}
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
HTML::FormFu::Role::NestedHashUtils - role for nested hashes
=head1 VERSION
version 2.07
=head1 AUTHOR
Carl Franks <cpan@fireartist.com>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2018 by Carl Franks.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut