Reject more syntactically invalid Python programs #8524

BurntSushi · 2023-11-06T19:15:53Z

Summary

This commit adds some additional error checking to the parser such that assignments that are invalid syntax are rejected. This covers the obvious cases like 5 = 3 and some not so obvious cases like x + y = 42.

This does add an additional recursive call to the parser for the cases handling assignments. I had initially been concerned about doing this, but set_context is already doing recursion during assignments, so I didn't feel as though this was changing any fundamental performance characteristics of the parser. (Also, in practice, I would expect any such recursion here to be quite shallow since the recursion is done on the target of an assignment. Such things are rarely nested much in practice.)

Fixes #6895

Test Plan

I've added unit tests covering every case that is detected as invalid on an Expr.

charliermarsh

This is excellent! Welcome to the repo :)

crates/ruff_python_parser/src/invalid.rs

This commit adds some additional error checking to the parser such that assignments that are invalid syntax are rejected. This covers the obvious cases like `5 = 3` and some not so obvious cases like `x + y = 42`. This does add an additional recursive call to the parser for the cases handling assignments. I had initially been concerned about doing this, but `set_context` is already doing recursion during assignments, so I didn't feel as though this was changing any fundamental performance characteristics of the parser. (Also, in practice, I would expect any such recursion here to be quite shallow since the recursion is done on the target of an assignment. Such things are rarely nested much in practice.) Fixes #6895

This test previously asserted that, e.g., `a = 1, b = 2`, was valid Python code. But it turns out that it is not: >>> a = 1, b = 2 File "<input>", line 1 a = 1, b = 2 ^^^^^ SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='? This commit flips the particular assert to check that no Python code is detected within the comment.

With the parser becoming a bit more strict, it discovered some invalid syntax in one of the formatter tests. In particular, `yield a = 1`: >>> (yield a, b) = (1, 2) File "<input>", line 1 (yield a, b) = (1, 2) ^^^^^^^^^^ SyntaxError: cannot assign to yield expression here. Maybe you meant '==' instead of '='? We just remove that bit from the `yield` test.

charliermarsh

Nice work.

BurntSushi · 2023-11-06T19:58:00Z

@charliermarsh Can you check out the two commits I've just pushed? In particular, the stricter parser caused two tests to fail. I think my changes to those tests are correct, but I'd like to be cautious here!

charliermarsh · 2023-11-06T19:58:46Z

Taking a closer look at those changes...

charliermarsh · 2023-11-06T20:01:40Z

@BurntSushi - Those both look correct to me. I actually don't fully understand why app_label=\"core\", model=\"user\"", was previously marked as valid code, what was the "target" and the "value"?

BurntSushi · 2023-11-06T20:05:28Z

was previously marked as valid code, what was the "target" and the "value"?

For x="a", y="b", it looks like it parsed as two targets, x and ("a", y) with a single value of b. It's not totally clear to me how it gets that particular parse. That first equals sign, I'd imagine, would inhibit picking up the second target.

charliermarsh · 2023-11-06T20:06:33Z

Ahh ok, so it's like x = ("a", y) = "b". Makes sense-ish.

github-actions · 2023-11-06T20:11:44Z

`ruff-ecosystem` results

Linter (stable)

ℹ️ ecosystem check detected linter changes. (+0 -27 violations, +0 -0 fixes in 41 projects)

apache/airflow (+0 -8 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL

- airflow/config_templates/default_webserver_config.py:84:1: ERA001 Found commented-out code
- airflow/example_dags/tutorial.py:63:9: ERA001 Found commented-out code
- airflow/serialization/serialized_objects.py:1195:13: ERA001 Found commented-out code
- airflow/serialization/serialized_objects.py:1211:13: ERA001 Found commented-out code
- airflow/settings.py:633:1: ERA001 Found commented-out code
- airflow/utils/log/secrets_masker.py:174:13: ERA001 Found commented-out code
- tests/system/providers/amazon/aws/example_eks_templated.py:45:1: ERA001 Found commented-out code
- tests/system/providers/amazon/aws/example_eks_templated.py:49:1: ERA001 Found commented-out code

bokeh/bokeh (+0 -6 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL

- examples/integration/layout/plot_fixed_frame_size.py:40:1: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:114:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:167:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:221:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:269:9: ERA001 Found commented-out code
- tests/unit/bokeh/plotting/test__renderer.py:125:1: ERA001 Found commented-out code

zulip/zulip (+0 -13 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL

- zerver/data_import/slack.py:581:13: ERA001 Found commented-out code
- zerver/lib/digest.py:89:1: ERA001 Found commented-out code
- zerver/lib/display_recipient.py:106:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:309:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:317:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:321:5: ERA001 Found commented-out code
- zerver/middleware.py:152:13: ERA001 Found commented-out code
- zerver/middleware.py:175:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:548:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:550:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:556:17: ERA001 Found commented-out code
- zerver/tests/test_events.py:727:9: ERA001 Found commented-out code
- zproject/prod_settings_template.py:264:1: ERA001 Found commented-out code

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
ERA001	27	0	27	0	0

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+0 -25 violations, +0 -0 fixes in 41 projects)

apache/airflow (+0 -6 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL --preview

- airflow/config_templates/default_webserver_config.py:84:1: ERA001 Found commented-out code
- airflow/example_dags/tutorial.py:63:9: ERA001 Found commented-out code
- airflow/settings.py:633:1: ERA001 Found commented-out code
- airflow/utils/log/secrets_masker.py:174:13: ERA001 Found commented-out code
- tests/system/providers/amazon/aws/example_eks_templated.py:45:1: ERA001 Found commented-out code
- tests/system/providers/amazon/aws/example_eks_templated.py:49:1: ERA001 Found commented-out code

bokeh/bokeh (+0 -6 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL --preview

- examples/integration/layout/plot_fixed_frame_size.py:40:1: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:114:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:167:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:221:9: ERA001 Found commented-out code
- tests/integration/widgets/tables/test_source_updates.py:269:9: ERA001 Found commented-out code
- tests/unit/bokeh/plotting/test__renderer.py:125:1: ERA001 Found commented-out code

zulip/zulip (+0 -13 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --select ALL --preview

- zerver/data_import/slack.py:581:13: ERA001 Found commented-out code
- zerver/lib/digest.py:89:1: ERA001 Found commented-out code
- zerver/lib/display_recipient.py:106:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:309:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:317:5: ERA001 Found commented-out code
- zerver/lib/email_notifications.py:321:5: ERA001 Found commented-out code
- zerver/middleware.py:152:13: ERA001 Found commented-out code
- zerver/middleware.py:175:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:548:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:550:13: ERA001 Found commented-out code
- zerver/tests/test_events.py:556:17: ERA001 Found commented-out code
- zerver/tests/test_events.py:727:9: ERA001 Found commented-out code
- zproject/prod_settings_template.py:264:1: ERA001 Found commented-out code

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
ERA001	25	0	25	0	0

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

charliermarsh · 2023-11-06T20:16:06Z

Those ecosystem changes look like strict improvements to me.

zanieb

Nice :)

dhruvmanila

Thanks for writing such a thorough test suite! :)

BurntSushi requested a review from charliermarsh November 6, 2023 19:15

BurntSushi force-pushed the ag/fix-6895 branch from bd787b4 to db76759 Compare November 6, 2023 19:19

charliermarsh reviewed Nov 6, 2023

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charliermarsh added the bug Something isn't working label Nov 6, 2023

BurntSushi added 3 commits November 6, 2023 14:54

BurntSushi force-pushed the ag/fix-6895 branch from db76759 to 9142dae Compare November 6, 2023 19:55

charliermarsh approved these changes Nov 6, 2023

View reviewed changes

zanieb approved these changes Nov 6, 2023

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dhruvmanila approved these changes Nov 7, 2023

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BurntSushi merged commit 6a1fa47 into main Nov 7, 2023
17 checks passed

BurntSushi deleted the ag/fix-6895 branch November 7, 2023 12:16

miccal mentioned this pull request Nov 8, 2023

ruff 0.1.5 Homebrew/homebrew-core#153715

Merged

BurntSushi mentioned this pull request Jan 4, 2024

pep440: some minor refactoring, mostly around error types astral-sh/uv#780

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Reject more syntactically invalid Python programs #8524

Reject more syntactically invalid Python programs #8524

BurntSushi commented Nov 6, 2023 •

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Reject more syntactically invalid Python programs #8524

Reject more syntactically invalid Python programs #8524

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BurntSushi commented Nov 6, 2023 • edited Loading

Summary

Test Plan

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BurntSushi commented Nov 6, 2023

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BurntSushi commented Nov 6, 2023

charliermarsh commented Nov 6, 2023

github-actions bot commented Nov 6, 2023

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BurntSushi commented Nov 6, 2023 •

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