check for statement inside stage in extracted WW

[Alex-Jordan]

In #1069 we started looking for a statement tag in extracted WW. Because my knowledge of tools for analyzing XML in Python is weak, I just found a way to check if there was a statement child of the root webwork and called it a day. But this neglected to account for when there is a stage, with the statement inside the stage, making the statement a grandchild of the root, not a child.

So we need a better way.

[rbeezer]

I like "lxml" but it does not seem to be part of standard Python. Sounds like ElementTree is not as powerful/complete.

While poking around, I found this, which sounded helpful for this particular problem, but I won't claim to have studied it very carefully for this particular case:

https://stackoverflow.com/questions/5373902/python-xml-query-get-parent

[mitchkeller]

The python documentation makes me think that

if problem_root.find('statement') is None:

can become

if problem_root.find('.//statement') is None:

since // from XPATH is supported and the example in the documentation says about //:

Selects all subelements, on all levels beneath the current element. For example, .//egg selects all egg elements in the entire tree.

[rbeezer]

That sounds right.

On 6/28/19 6:30 AM, Mitchel T. Keller wrote:

The python documentation makes me think that

|if problem_root.find('statement') is None:|

can become

|if problem_root.find('.//statement') is None:|

since |//| from XPATH is supported and the example in the documentation says about |//|:

Selects all subelements, on all levels beneath the current element. For
example, .//egg selects all egg elements in the entire tree.

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[rbeezer]

Fied at #1164