XML::SAX::Base XML::SAX::Base is a base class SAX Drivers and Filters.
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Perl module drivers SAX SAX drivers SAX filters

XML::SAX::Base Description

XML::SAX::Base is a base class SAX Drivers and Filters. XML::SAX::Base is a base Perl class with SAX Drivers and Filters.SYNOPSIS package MyFilter; use XML::SAX::Base; @ISA = ('XML::SAX::Base');This module has a very simple task - to be a base class for PerlSAX drivers and filters. It's default behaviour is to pass the input directly to the output unchanged. It can be useful to use this module as a base class so you don't have to, for example, implement the characters() callback.The main advantages that it provides are easy dispatching of events the right way (ie it takes care for you of checking that the handler has implemented that method, or has defined an AUTOLOAD), and the guarantee that filters will pass along events that they aren't implementing to handlers downstream that might nevertheless be interested in them.WRITING SAX DRIVERS AND FILTERSWriting SAX Filters is tremendously easy: all you need to do is inherit from this module, and define the events you want to handle. A more detailed explanation can be found at http://www.xml.com/pub/a/2001/10/10/sax-filters.html.Writing Drivers is equally simple. The one thing you need to pay attention to is NOT to call events yourself (this applies to Filters as well). For instance: package MyFilter; use base qw(XML::SAX::Base); sub start_element { my $self = shift; my $data = shift; # do something $self->{Handler}->start_element($data); # BAD }The above example works well as precisely that: an example. But it has several faults: 1) it doesn't test to see whether the handler defines start_element. Perhaps it doesn't want to see that event, in which case you shouldn't throw it (otherwise it'll die). 2) it doesn't check ContentHandler and then Handler (ie it doesn't look to see that the user hasn't requested events on a specific handler, and if not on the default one), 3) if it did check all that, not only would the code be cumbersome (see this module's source to get an idea) but it would also probably have to check for a DocumentHandler (in case this were SAX1) and for AUTOLOADs potentially defined in all these packages. As you can tell, that would be fairly painful. Instead of going through that, simply remember to use code similar to the following instead: package MyFilter; use base qw(XML::SAX::Base); sub start_element { my $self = shift; my $data = shift; # do something to filter $self->SUPER::start_element($data); # GOOD (and easy) ! }This way, once you've done your job you hand the ball back to XML::SAX::Base and it takes care of all those problems for you!Note that the above example doesn't apply to filters only, drivers will benefit from the exact same feature. Requirements: · Perl

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