unicodedata: Fix Bidirectional, improve parser - #8548
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe Unicode build script now generates compressed Unicode 3.2 membership and bidi-difference tables. Runtime property queries use shared differential lookup logic with Unicode 3.2 membership fallback. ChangesUnicode 3.2 legacy lookup
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change can produce incorrect bidirectional behavior for some Unicode characters when using the legacy Unicode 3.2 data path because algorithmic range membership is incomplete. Merge should wait until that correctness issue is fixed or explicitly accepted by the owner. Sequence Diagram(s)sequenceDiagram
participant BuildScript
participant GeneratedTables
participant PropertyLookup
BuildScript->>GeneratedTables: Generate MEMBERSHIP_3_2 and BIDI_CLASS_DIFF
PropertyLookup->>GeneratedTables: Read differential tables and membership ranges
PropertyLookup->>PropertyLookup: Select modern or Unicode 3.2 property values
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✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@crates/unicode/build.rs`:
- Around line 208-231: Update generate_membership_3_2 so the membership_set
records each UnicodeData First/Last pair as one inclusive range rather than
inserting only the reported endpoints. Track the pending First record and, when
its matching Last record is encountered, insert the combined start-to-end range;
preserve single-record handling for entries outside such pairs.
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crates/unicode/build.rscrates/unicode/src/data.rscrates/unicode/unicode/ucd32/UnicodeData-3.2.0.txt
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I'll handle the unexpected success tomorrow. I'll probably have to skip the test because 3.2.0 passes but modern Unicode fails because the test is for 3.14 whereas our data is aligned with Python 3.15. |
joshuamegnauth54
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August 19, 2026 02:11
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📦 Library DependenciesThe following Lib/ modules were modified. Here are their dependencies: [ ] lib: cpython/Lib/pydoc.py dependencies:
dependent tests: (5 tests)
[ ] lib: cpython/Lib/random.py dependencies:
dependent tests: (140 tests)
[ ] test: cpython/Lib/test/test_compile.py dependencies: dependent tests: (no tests depend on compile) [ ] test: cpython/Lib/test/test_unicodedata.py (TODO: 12) dependencies: dependent tests: (no tests depend on unicode) [ ] lib: cpython/Lib/difflib.py dependencies:
dependent tests: (243 tests)
[ ] lib: cpython/Lib/locale.py dependencies:
dependent tests: (104 tests)
[ ] test: cpython/Lib/test/test_atexit.py (TODO: 1) dependencies: dependent tests: (177 tests)
[x] lib: cpython/Lib/code.py dependencies:
dependent tests: (2 tests) [x] lib: cpython/Lib/dis.py dependencies:
dependent tests: (77 tests)
[ ] lib: cpython/Lib/argparse.py dependencies:
dependent tests: (258 tests)
[ ] lib: cpython/Lib/inspect.py dependencies:
dependent tests: (96 tests)
[ ] test: cpython/Lib/test/test_isinstance.py dependencies: dependent tests: (no tests depend on isinstance) [ ] test: cpython/Lib/test/test_str.py (TODO: 5) dependencies: dependent tests: (no tests depend on str) [x] lib: cpython/Lib/io.py dependencies:
dependent tests: (108 tests)
[ ] lib: cpython/Lib/ntpath.py dependencies:
dependent tests: (53 tests)
[ ] lib: cpython/Lib/mimetypes.py dependencies:
dependent tests: (42 tests)
[ ] test: cpython/Lib/test/test_math.py (TODO: 1) dependencies: dependent tests: (245 tests)
[x] test: cpython/Lib/test/test_binascii.py (TODO: 2) dependencies: dependent tests: (95 tests)
[ ] lib: cpython/Lib/test/support dependencies:
dependent tests: (2 tests)
[x] lib: cpython/Lib/codecs.py dependencies:
dependent tests: (161 tests)
[ ] lib: cpython/Lib/json dependencies:
dependent tests: (13 tests)
[x] lib: cpython/Lib/struct.py dependencies:
dependent tests: (179 tests)
[ ] lib: cpython/Lib/html dependencies:
dependent tests: (14 tests)
[ ] test: cpython/Lib/test/test_array.py (TODO: 3) dependencies: dependent tests: (102 tests)
[ ] test: cpython/Lib/test/test_exceptions.py (TODO: 22) dependencies: dependent tests: (no tests depend on exception) [x] lib: cpython/Lib/shlex.py dependencies:
dependent tests: (10 tests)
[ ] lib: cpython/Lib/configparser.py dependencies:
dependent tests: (2 tests)
[x] test: cpython/Lib/test/test_marshal.py (TODO: 5) dependencies: dependent tests: (25 tests)
[ ] lib: cpython/Lib/csv.py dependencies:
dependent tests: (4 tests)
[ ] lib: cpython/Lib/base64.py dependencies:
dependent tests: (54 tests)
[x] lib: cpython/Lib/datetime.py dependencies:
dependent tests: (67 tests)
[ ] lib: cpython/Lib/dataclasses.py dependencies:
dependent tests: (98 tests)
[ ] test: cpython/Lib/test/test_syntax.py (TODO: 65) dependencies: dependent tests: (no tests depend on syntax) [ ] test: cpython/Lib/test/test_bigmem.py (TODO: 1) dependencies: dependent tests: (no tests depend on bigmem) [ ] lib: cpython/Lib/email dependencies:
dependent tests: (53 tests)
[x] lib: cpython/Lib/getopt.py dependencies:
dependent tests: (42 tests)
[ ] lib: cpython/Lib/glob.py dependencies:
dependent tests: (58 tests)
[ ] lib: cpython/Lib/collections dependencies:
dependent tests: (331 tests)
[ ] test: cpython/Lib/test/test_dict.py (TODO: 4) dependencies: dependent tests: (no tests depend on dict) [ ] test: cpython/Lib/test/test_list.py (TODO: 3) dependencies: dependent tests: (no tests depend on list) [x] test: cpython/Lib/test/test_thread.py (TODO: 3) dependencies: dependent tests: (14 tests) [x] lib: cpython/Lib/colorsys.py dependencies:
dependent tests: (1 tests)
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youknowone
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Aug 22, 2026
| self.assertRaises(TypeError, self.db.category, 'xx') | ||
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| @unittest.expectedFailure # TODO: RUSTPYTHON; - 'BN' != '' | ||
| @unittest.skip # TODO: RUSTPYTHON; AssertionError: 'BN' != '' (passes on 3.2, fails on latest) |
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if this is AssertionError, why not expectedFailure but skip?
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Basically, the test passes for 3.2.0 (this patch fixes 3.2.0) but fails for the latest Unicode because RustPython's tests are 3.14. So, @expectedfailure fails because of "unexpected success" for 3.2.0. If we update the test to 3.15, which is a one line change I believe, then the test passes for RustPython now. 😁 @ShaharNaveh Your input is highly relevant for this.
Here is a small adaptation of the 3.15 tests. Run it under CPython and RustPython - they both pass as of this patch. 😸
import unicodedata
# Basically copied directly from CPython but changed to asserts.
# https://github.com/python/cpython/blob/main/Lib/test/test_unicodedata.py
# NOTE: This is for Python 3.15. RustPython uses the 3.14 tests currently.
# That's why it fails for latest.
def test_bidi(db: unicodedata.UCD, old: bool):
assert db.bidirectional("\ufffe") == ("" if old else "BN")
assert db.bidirectional(" ") == "WS"
assert db.bidirectional("A") == "L"
assert db.bidirectional("\U00020000") == "L"
# New in 4.1.0
assert db.bidirectional("+") == ("ET" if old else "ES")
assert db.bidirectional("\u0221") == ("" if old else "L")
assert db.bidirectional("\U000e01ef") == ("" if old else "NSM")
# New in 13.0.0
assert db.bidirectional("\u0b55") == ("" if old else "NSM")
assert db.bidirectional("\U0003134a") == ("" if old else "L")
# New in 14.0.0
assert db.bidirectional("\u061d") == ("" if old else "AL")
assert db.bidirectional("\U0002b738") == ("" if old else "L")
# New in 15.0.0
assert db.bidirectional("\u0cf3") == ("" if old else "L")
assert db.bidirectional("\U000323af") == ("" if old else "L")
# New in 16.0.0
assert db.bidirectional("\u0897") == ("" if old else "NSM")
assert db.bidirectional("\U0001fbef") == ("" if old else "ON")
# CPython runs the test twice, once for 3.2.0 and once for the latest Unicode.
# @expectedFailure fails because the 3.2.0 test passes.
# @expectedSuccess (the default) fails because the latest Unicode test fails on 3.14.
# Both of these pass on RustPython as of this patch because I'm using the 3.15 tests.
test_bidi(unicodedata.ucd_3_2_0, True)
test_bidi(unicodedata, False)
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hmmmmm, I'd be fine to have this test to be from 3.15.0rc1 with a comment redirecting to #8548 (comment) (and by "this test" I mean the entire file)
3.15 is already at a stable state, there's not gonna be major changes, I think we can have this one as an exception
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Hmm, so should I replace our test_unicode.py with 3.15's and then port over all of the @expectedFailures et cetera? I force pushed with the 3.15 bidi test just to make sure it passes in CI too for now. 😁
We can save space by calculating the diffs between modern Unicode and 3.2.0 and storing membership information where valid. This avoids storing entire tables for 3.2.0, and is also more correct in the long run since it handles absence from 3.2.0 correctly. I switched over Bidi to this new method which partially fixed the test. Unfortunately, our Unicode data is more up to date than Python 3.14 so the test fails for modern Unicode. I updated the test to 3.15 as per review, and now our bidi passes the test.
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We can save space by calculating the diffs between modern Unicode and 3.2.0 and storing membership information where valid. This avoids storing entire tables for 3.2.0, and is also more correct in the long run since it handles absence from 3.2.0 correctly. I switched over Bidi to this new method which partially fixed the test. Unfortunately, our Unicode data is more up to date than Python 3.14 so the test fails for modern Unicode. It should pass with 3.15's tests.
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