I came across CPAN Deep::Hash::Utils giving the approach below which seems simple enough. I also looked at the modules suggested by Re: A more elegant way to filter a nested hash? ( data xpath, dpath, diver, walk, walker, visitor, jquery, pquery, json path, css csel, MarpaX::xPathLike) and like the suggestions on existing art.
use Deep::Hash::Utils qw(reach nest deepvalue);
sub hash_filter {
my ($source, $filter) = @_;
my %rc;
while (my @l = reach($filter)) {
pop @l;
if (defined( my $source_val = deepvalue($source, @l) ) ) {
# hint: work around nest behavior on even vs odd key count
nest(\%rc, @l)->{ $l[$#l] } = $source_val;
}
}
\%rc;
}
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|