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Re: Re: Re: XML::Parser Tutorial

by gildir (Pilgrim)
on Mar 07, 2001 at 21:40 UTC ( #62789=note: print w/ replies, xml ) Need Help??


in reply to Re: Re: XML::Parser Tutorial
in thread XML::Parser Tutorial

Well, but .... (there is allways a 'but') :-)

Suppose I do not subclass XML::Parser. But then, how do I pass parameters to XML::Parser handler methods and collect results of their run without using global variables of XML::Parser package? Only class that I get to handler methods is expat itself and there is no place for any aditional parameters/results of handler methods.

And if I subclass XML::Parser, only advantage that I gain is using my own package namespace for global variables instead of XML::Parser's namespace. This do not looks to me like a good example of object oriented programming style.

Possible silution is the one mirod suggested using Non-Expat-Options but it is just a little bit less ugly than these two.

There best solution will be forcing XML::Parser to use my custom subclass of XML::Parser::Expat instead of XML::Parser::Expat itself. Is there some way how to do that?


Comment on Re: Re: Re: XML::Parser Tutorial
Re: Re: Re: Re: XML::Parser Tutorial
by Anonymous Monk on Mar 14, 2001 at 15:41 UTC
    The way to do this, without relying on the fact that the $p is a hashref, is to pass a closure as the handlers, and have an object that you created saved in the closure. This is how PerlSAX is implemented.

    Witness:

    my $handler = bless {}, "MyHandler";
    my $p = XML::Parser->new(Handlers => {
       Start => sub { $handler->handle_start(@_) } 
    });
    
    package MyHandler;
    
    sub handle_start {
      my ($handler, $p, $element, %attribs) = @_;
      ...
    }
    

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