Second argument of 'index-of' method doesn't evaluate to element content

[Elucin]

Here is a piece of test code I'm working with:

from lxml import etree as ET
import elementpath

root = ET.fromstring("""<root>
    <incode>030</incode>
    <descript></descript>
</root>""")

test1 = "/root/descript[index-of(('030','031'), '030')]"
test2 = "/root/descript[ancestor::root/incode = '030']"
test3 = "/root/descript[index-of(('030','031'), ancestor::root/incode)]"

assert len(elementpath.select(root, test1)) == 1
assert len(elementpath.select(root, test2)) == 1
assert len(elementpath.select(root, test3)) == 1

test1 uses a literal string and finds the index in the list. As expected, it works fine and selects the element.
test2 is meant to prove that ancestor::root/incode does indeed return the expected value of '030'.
But then I get to test3, which should give the same results as test1 given that ancestor::root/incode = '030' is true, but instead I get an assert error, as the length of the selection is 0.

So I know that ancestor::root/incode gives the right value, but not when contained within the index-of method. (at least, I haven't tried it with other methods, but it may not be exclusive to the index-of method.)

I'm using Python 3.8.0

[brunato]

Hi,

this was due to the missing of usage of the data value of the 2nd argument. I've changed using a call for getting the atomized operand (returns the data value of the element and check cardinality). The fix will be available with the release v2.0.0.

Thanks

[brunato]

Release v2.0.0 is available in PyPI