From: David Vallner <david@...>
Date: 2006-11-07T11:24:35+09:00
Subject: Re: REXML

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pdg wrote:
> Assuming I go with the Ruby pull parser, how do I use this in my code.
> I see from the link the code sample, but I have no idea how to throw
> that into my code and make it work. Any suggestions.
>=20

Generally, you should have some layer between XML input, and processing
the records themselves. E.g. a trivial Song class, or at least a hash.
Personally, I'd make a XMLSongList class that's enumerable (implements
#each), and rework the REXML code that works for small files into one
that yields a Song object for each of the records in succession by
querying the tree accordingly.

That shouldn't then be too hard to rework so that while #each is
running, it opens a pull parser, and for each yield, builds up a Song
object going through the record in the order how the elements appear in
the XML file, instead of a random one. Once you isolate the code that
manipulates the XML to the smallest significant unit (a song record in
this case, I presume), it shouldn't be conceptually that difficult to
rework from a tree parser to a pull parser. The code probably will get a
little messier and verbose, but the main shift of thinking is in not
asking the XML for what your object needs, but feeding an object what
the XML has.

> PS: idiot (slaps head). Yes it was 5-6meg not gig!
>=20

6MB is still Huge (tm) for a XML file.


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