fix: XML::Reader XML::Attr garbage collection #2599
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which is now being used to implement Reader#attributes fix: Reader#namespaces on JRuby now returns an empty hash when no attributes are present (previously returned nil)
which will use rb_category_warning if it's available, and rb_warning if it's not
This method will be removed in a future version
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What problem is this PR intended to solve?
This is a proposed fix for #2598, see that issue for an extended explanation of the problem.
This PR implements "option 2" from that issue's proposed solutions:
Reader#attribute_hashthat will return aHash<String ⇒ String>(instead of anArray<XML::Attr>)Reader#attribute_nodeswith a plan to remove it entirely in a future releaseReader#attributesto use#attribute_hash(instead of#attribute_nodes)After this change, only applications calling
Reader#attribute_nodesdirectly will be running the unsafe code. These users will see a deprecation warning and may use#attribute_hashas a replacement.I think it's very possible that
Reader#attribute_hashwon't meet the needs of people who are working with namespaced attributes and are using#attribute_nodesfor this purpose. However, I'm intentionally deferring any attempt to solve that DX problem until someone who needs this functionality asks for it.Have you included adequate test coverage?
I tried and failed to add test coverage to the suite that would reproduce the underlying GC bug.
However, existing test coverage of
Reader#attributesis sufficient for now.Does this change affect the behavior of either the C or the Java implementations?
This PR modifies both the C and Java implementations to behave the same.
Notably, the Java implementation contains a small bugfix which is that
Reader#namespacesnow returns an empty hash when there are no namespaces (it previously returnednil).