TwigHandlers not always called?

BenHopkins has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks (whether ye be Monker, Monked, or Monkee):

I'm sestting up TwigHandlers like this (partial code):

 
   my $twig = new XML::Twig(
                TwigHandlers => {
                    'byline' => \&byline,
                    'body.head/hedline' => \&hedline,
                    'body.content/p' => \&process_p,
                    'body.content/hl2' => \&process_body_hl2,
                    'body.content/block/p' => \&process_p,
                    'body.content/block/hl2' => \&process_body_hl2,
                    'body.content/table' => \&process_table,
etc. etc.
[download]

... and process_body_hl2 is pretty simple:

sub process_body_hl2 {
    my ($t, $hl2) = @_;
    my $para = crunch($hl2->text);
    $body .= "<p><b>$para</b></p>";
}
[download]

Input looks like this:

    <body.content>
      <hl2 style="section_head">SECTION HEAD</hl2>
      <hl2 style="subhead">subhead</hl2>
      <p/>
[download]

The output for that part comes out like this (this is a different format of xml from the input):

<body.content>
<p>SECTION HEAD</p><p>subhead</p>
[download]

Where are the <b> tags? Later, the next hl2 in the body looks like this:

 <p/>
 <hl2 style="subhead">2nd subhead</hl2>
[download]

And this one comes out the way it should:

<p><b>2nd subhead</b></p><p>
[download]

Now, how come the first two did not work, but the subsequent one did?

Comment on TwigHandlers not always called? Select or Download Code

Replies are listed 'Best First'.
Re: TwigHandlers not always called? by mirod (Canon) on Jul 12, 2013 at 05:10 UTC
I don't see anything obvious at first glance, so we'll need to dig a little further. Could you provide a test case that we could run? It would be best if it includes the smallest code that triggers the problem, input data and expected output. This way we can reproduce the problem, and see if we can fix it (actually my real hope is that while creating the test case you figure out what the problem is, it has happened to me more than once ;--)	[reply]
Re^2: TwigHandlers not always called? by BenHopkins (Sexton) on Jul 13, 2013 at 01:04 UTC
Oops. Why there's a bullet in my foot! AND there's a gun in my hand! Sorry to bother you, I did it to myself. Found the problem by trying to boil down a big, complicated program into the small test cases you requested, so I guess you did help fix the problem, even though it was not caused by you. XML::Twig is robust and dependable.	[reply]
Re^3: TwigHandlers not always called? by mirod (Canon) on Jul 13, 2013 at 09:14 UTC
Glad I could help ;--) There are (still!) bugs in XML::Twig though, not to mention quirks that are worth asking about. So don't feel bad about asking for help.	[reply]