[Docutils-develop] [docutils:patches] #213 Change section handling to not rely on exceptions and re

- **status**: open-fixed --> closed-fixed
- **Comment**:

The issue is fixed in Docutils 0.22 released 2025-07-29.
Thank you for the patch.




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**[patches:#213] Change section handling to not rely on exceptions and reparsing**

**Status:** closed-fixed
**Group:** None
**Created:** Wed Mar 26, 2025 07:57 PM UTC by Arne Skjærholt
**Last Updated:** Fri Apr 25, 2025 10:37 AM UTC
**Owner:** nobody
**Attachments:**

- [section-handling.patch](https://sourceforge.net/p/docutils/patches/213/attachment/section-handling.patch) (13.3 kB; text/x-patch)


While waiting for responses to an email I sent to the -users I decided to dig further into the issue and ended up implementing a fix. To recap my issue, I was having problems with a custom directive's nested parse of its content when section headers were used, because the existing code throws an EOFError up the chain to find the correct place to attach a new section.

The proposed patch changes this by adding an explicit stack of sections to the memo object instead of using the Python call stack, and changing RSTState.section() to unwind this state in-place, instead of using exception throwing to find the right place. In fact, I think this is the kind of implementation suggested as an alternative in a comment in the existing code. This also lets us get rid of memo.section_bubble_up_kludge and Line.eofcheck, which only existed to handle the exceptions.

In addition to the changed code, I've had to make six changes to the test suite.

- Three diagnostics in test/functional/expected/standalone_rst_pseudoxml.txt now have line numbers relative to the beginning of the file rather than some other element. I think because we no longer initiate a nested parse for sections.
- Two diagnostics in test/test_parsers/test_rst/test_targets.py have different line numbers, indicating the second conflicting label, rather than the implicit label generated by the section. I think the reason is that due to the exception throwing approach, the existing code handled the section label later than the other, even if the section is earlier in the text.
- test/test_parsers/test_rst/test_section_headers.py has one diagnostic output less. I think this diagnostic is a duplicate, caused by the rethrowing of the exception for bubbling up the stack.




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