However, I need to access some attributes from the root element. If I don't use twig_roots then it has to load the whole file and it's not as trivial to simply not print nodes to be removed. It kind of defeats the main feature of Twig.
Is there a good way to read the attributes from the top-level element, and then configure the twigs (and print outside roots) and callbacks based on what I found? How to get what was already read to print seemlessly with what it will start handling differently?
Another idea is to start processing, then quit after the first start tag. Is there a flag or something that can be set from the callback to "cancel" and return from parse() without reading any more from the file?
—John
2006-05-05 Retitled by GrandFather, as per Monastery guidelines
Original title: 'accessing root tags when XML::Twig and twig_roots'
I think that what you are looking for is the start_tag_handlers option, which lets you call a handler as soon as the start tag of an element has been parsed.
In the handler you can die (provided the call to parse is wrapped in an eval) or do whatever you want, including setting regular handlers.
If I set the "roots" within the first callback, what happens to the printout? I have a partial open going on and it hasn't started printing outside of roots yet. Whatever happens, will it be well-behaved?
What did you try? I find it easier to get some code to work than to answer questions like these ;--(