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package HTML::FormFu::Role::NestedHashUtils;
$HTML::FormFu::Role::NestedHashUtils::VERSION = '2.01';
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 = \( $$ref->{$name} );
}
}
}
return;
}
sub nested_hash_key_exists {
my ( $self, $param, $name ) = @_;
my ( $root, @names ) = split_name($name);
if ( !@names ) {
return exists $param->{$root};
}
my $ref = \$param->{$root};
for my $i ( 0 .. $#names ) {
my $part = $names[$i];
if ( $part =~ /^(0|[1-9][0-9]*)\z/ ) {
croak "nested param clash for ARRAY $root"
if ref $$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;
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