[libxml-devel] Subclassing XML::Document?

[Dan Janowski]

You may be able to produce what you want by defining a module and  
extending the Document with it:

ardent:~ danj$ irb
irb(main):001:0> class A
irb(main):002:1> end
=> nil
irb(main):003:0> module B
irb(main):004:1> def hello
irb(main):005:2> puts "hello"
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> a=A.new
=> #<A:0x19256c>
irb(main):009:0> a.extend B
=> #<A:0x19256c>
irb(main):010:0> a.hello
hello
=> nil
irb(main):011:0>


You can also override #parse by renaming the original function and  
perform the extend after calling #parse_original.

Dan

On Aug 26, 2008, at 23:01, Mark Thomas wrote:

> I'd like to create a subclass of XML::Document. However, I'm having  
> trouble figuring out how I would instantiate my subclass because  
> parsing requires Parser.parse() which returns an XML::Document  
> instead of My::Subclass. Unfortunately, Ruby doesn't have a way of  
> changing the class of an object.
>
> Any suggestions?
>
> -- Mark.
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