fix: [#465] Avoid NPE with missing 'r' attribute #514
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Tracks both row and column indices to allow falling back to those to determine row and/or cell address for Excel files that do not provide the (optional) reference attribute 'r'. Inspired by the apache poi approach.
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Fixes #465
For the case the (optional)
rattribute is not present, the code tracks the running line and column number, falling back to those if therattribute does not provide the proper addresses.Adds a test case (
issue514.xlsx), that fails being processed (with the reported NPE) and passes with the fix.Please note: The file that was provided by the ticket reporter @fabiospiga has different issues in addition to the reported NPE. The fix of this PR does help to not throw the reported NPE also for that file, but it does not address the other issues (I tried with a time-box but failed to get it fully processed). The PR let's us process the file that brought us to this ticket in the first place.
Inspired by the apache poi approach, see code here.
This PR is now complete IMHO and ready to be reviewed.