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Re: Passing parameters for XML::twig handler

by mirod (Canon)
on Apr 27, 2011 at 08:27 UTC ( #901497=note: print w/replies, xml ) Need Help??

in reply to Passing parameters for XML::twig handler

In order to pass arguments to a handler you need to use a closure:

parse_xml( $xmlfile); sub parse_xml { my( $file)= @_; my $ups_able_info= []; my $twig1 = XML::Twig->new( twig_handlers => { 'ups:TABLE_INFO/ups:field' => sub { parse +_table_info( @_, $ups_able_info); } ) ->parsefile( $file); # now $ups_table_info is filled } sub parse_table_info { my( $twig, $table_info, $ups_able_info)= @_; # note the extra argu +ment my $table_column = {}; $table_column->{$table_info->field('ups:tag')} = $table_info->fie +ld('ups:ui_name'); push(@{$ups_table_info}, $table_column); }

A good introduction to closures in Perl: Achieving closure by Simon Cozens

Also, I made a few cosmetic changes to your code, mostly to make it look a bit more modern:

  • no need for the & before a function name,
  • you mix camel case (parseXml) and underscore separated (parse_table_info) names, pick one scheme and stick to it (also, I hate camelCase ;--)
  • to me my $ups_able_info= []; is a lot more readable than my( $ups_able_info)= ([]);
  • use the XML::Twig->new syntax instead of the old, and potentially dangerous, new XML::Twig
  • I added the call to parsefile, to actually parse the file,
  • I usually write $elt->field( 'foo') instead of the longer $elt->first_child_text( 'foo') (even if it takes me longer to type because I usually type filed first, then go back and fix it ;--(

Also, you data structure seems a bit weird to me, but maybe it makes sense, I don't have enough detail to tell. $ups_table_info will end up looking something like [ { ui_tag => "val" }, {ui_another_tag => "val2"}, ...],, which doesn't look like the easiest to use data.

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Re^2: Passing parameters for XML::twig handler
by Anonymous Monk on Apr 19, 2017 at 20:31 UTC
    Great illustration ! thank you !!

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