Expat XML Parser extension

> Hi!
>
> I just wanted to inform you that I've been writing an Expat
> extension for gnu smalltalk today. I'll add some more documentation,
> finish it up and send a path within the next week.
>
> It's mainly a wrapper around the C API of Expat which emits SAX events,
> which can be processed by the existing XML.SAXDriver implementation.
>
> Expat is a stream parser and the smalltalk interface dows allow parsing
> of unpositional streams like eg. sockets.
>
> The good with the Expat parser is that it supports new (yet
> currently not implemented in XML.st) SAX events which are defined by the
> latest SAX extensions (such as cdata start/end and dtd start/end
> detection, etc.).
>
> The bad with Expat is that it requires yet another C lib.
>
> Also the current interface returns String objects for all strings. Those
> Strings are multibyte encoded (UTF-8) unicode. But writing a subclass
> of the exising interface which decodes them to UnicodeString won't be a
> big problem when someone needs it.
>
> The expat parser also parses (encoded) byte streams (utf-8, iso, ascii
> or utf-16 encoded) and not unicode strings. The current XML.XMLParser
> implementation seems not to be able to parse byte streams and only
> unicode strings (at least i want't able to throw in a UTF-8 encoded
> document string).
>
> Open questions with regard to the implementation are:
>
> How/When do I correctly free the allocated expat C parser struct?
> I'm currently storing the XML_Parser C struct as OOP in the Smalltalk
> interface object. (Similar to the zlib implemenation).
>
> But how do I ensure that the free function for it is called when my
> interface object is destroyed?
>
> I also put the package in packages/expat/ and used the zlib/ stuff as
> skeleton for the building system. Is that okay?
>
> I've also yet to discover how to create a patchset against the current
> tla tree. But I guess I'll just have to read the manual again ;-/ (GIT
> war a bit easier IMO :)
>
>
>
> Robin
>
>
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