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Re^3: Converting boolean values in XMLout

by ikegami (Pope)
on Jan 31, 2012 at 09:50 UTC ( #950918=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Converting boolean values in XMLout
in thread Converting boolean values in XMLout

decode_json uses JSON::true or JSON::false for the first instance it comes across, but then adds hash references to an existing true or false for all subsequent instances.

No, not quite.

When JSON::XS is loaded, it creates two objects

$JSON::XS::true = do { bless \(my $dummy = 1), "JSON::XS::Boolean" }; $JSON::XS::false = do { bless \(my $dummy = 0), "JSON::XS::Boolean" };

No other instances are ever created. No references to those are created. Those two objects are used everywhere.

There's probably a neat way to use Rmap to do the walking, but it was beyond my abilities I'm afraid. :(

It's refusing to visit the same reference twice. You could probably mess with its seen method (which appears to be a way at peeking at the module's internals).


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Re^4: Converting boolean values in XMLout
by perlyogi (Acolyte) on Sep 26, 2012 at 07:53 UTC

    The exact code for perl to take into consideration multiple routes to the same node so that rmap_ref need not be called multiple times would be

    rmap_ref { $_[0]{seen} = {}; $_ = "$_" if JSON::is_bool($_) } $result;

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