Sandbox::https://redirect.github.com/astral-sh/ruff/pull/29480

charliermarsh · 2026-10-19T13:14:32Z

Summary

We skip prefix-operator dispatch for identifiers and parse atoms together with their postfix chains. Keeping this work in parse_primary_expression makes the grouping-parenthesis flag local and avoids passing an intermediate ParsedExpr between atom and postfix parsing.

astral-sh-bot · 2026-10-19T13:17:48Z

Memory usage report

Memory usage unchanged ✅

astral-sh-bot · 2026-10-19T13:19:28Z

`ecosystem-analyzer` results

No diagnostic changes detected ✅

Full report with detailed diff (timing results)

astral-sh-bot · 2026-10-19T13:33:37Z

`ruff-ecosystem` results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

codspeed · 2026-10-19T13:34:06Z

Merging this PR will improve performance by 6.32%

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 4 improved benchmarks
✅ 240 untouched benchmarks
⏩ 10 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`parser[large/dataset.py]`	6.8 ms	6.3 ms	+7.78%
⚡	Simulation	`parser[pydantic/types.py]`	3 ms	2.8 ms	+6.32%
⚡	Simulation	`parser[numpy/ctypeslib.py]`	1.3 ms	1.3 ms	+5.97%
⚡	Simulation	`parser[unicode/pypinyin.py]`	516.5 µs	490.7 µs	+5.24%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing charlie/ruff-shared-postfix-atom (7b27b5d) with main (0a977a8)}

10 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

MichaReiser · 2026-10-19T18:58:09Z

    ///
    /// See: <https://docs.python.org/3/reference/expressions.html#atoms>
-    fn parse_atom(&mut self, context: ExpressionContext) -> ParsedExpr {
+    fn parse_atom(&mut self, context: ExpressionContext, is_parenthesized: &mut bool) -> Expr {


I always find &mut arguments hard to understand and try to avoid them if i can. But it's probably fine, given that this is local.

An alternative is to widen parse_atom and make it into parse_primary_expression (primary expression is a Python grammar). This way, is_parenthesized could remain entirely local to parse_primary_expression.

## Summary We parse atoms and their postfix chains together in `parse_primary_expression`, keeping grouping-parenthesis metadata local and removing the `&mut bool` output parameter. Implements [Micha's suggestion](#29480 (comment)) on top of #29480 so CodSpeed compares the two implementations directly. [CodSpeed reports no performance changes](https://github.com/astral-sh/ruff/pull/29507/checks?check_run_id=118282844884): 244 benchmarks unchanged and 10 skipped.

This PR contains the following updates: | Package | Type | Update | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---|---|---| | [DavidAnson/markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) | repository | minor | `v0.23.3` → `v0.24.0` | ![age](https://developer.mend.io/api/mc/badges/age/github-tags/DavidAnson%2fmarkdownlint-cli2/v0.24.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/github-tags/DavidAnson%2fmarkdownlint-cli2/v0.23.3/v0.24.0?slim=true) | | [ruff](https://docs.astral.sh/ruff) ([source](https://github.com/astral-sh/ruff), [changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)) | dependency-groups | patch | `==0.17.1` → `==0.17.3` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/ruff/0.17.3?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/ruff/0.17.1/0.17.3?slim=true) | Note: The `pre-commit` manager in Renovate is not supported by the `pre-commit` maintainers or community. Please do not report any problems there, instead [create a Discussion in the Renovate repository](https://github.com/renovatebot/renovate/discussions/new) if you have any questions. --- ### Release Notes <details> <summary>DavidAnson/markdownlint-cli2</summary> ### [`v0.24.0`](DavidAnson/markdownlint-cli2@v0.23.3...v0.24.0) [Compare Source](DavidAnson/markdownlint-cli2@v0.23.3...v0.24.0) </details> <details> <summary>astral-sh/ruff (ruff)</summary> ### [`v0.17.3`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#0173) [Compare Source](astral-sh/ruff@0.17.2...0.17.3) Released on 2026-10-26. ##### Preview features - \[`suspicious`] Add `shared-clock-mock` ([#29074](astral-sh/ruff#29074)) ##### Bug fixes - \[`pyupgrade`] Avoid incorrect conversions to f-strings (`UP032`) ([#25485](astral-sh/ruff#25485)) ##### Performance - Buffer stdout in `ruff format` ([#29631](astral-sh/ruff#29631)) - Specialize ASCII identifier lexing ([#29503](astral-sh/ruff#29503)) - Speed up identifier and keyword lexing ([#29463](astral-sh/ruff#29463)) ##### Documentation - \[`flake8-bandit`] Describe what the rule actually checks for `httpx` (`S113`) ([#27936](astral-sh/ruff#27936)) ##### Contributors - [@itsvedantkumar](https://github.com/itsvedantkumar) - [@charliermarsh](https://github.com/charliermarsh) - [@anishgirianish](https://github.com/anishgirianish) ### [`v0.17.2`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#0172) [Compare Source](astral-sh/ruff@0.17.1...0.17.2) Released on 2026-10-22. ##### Preview features - \[`complexity`] Add `unnecessary-regular-expression-compile` ([#25533](astral-sh/ruff#25533)) ##### Bug fixes - Avoid syntax errors for type variables with starred constraints (`UP040`, `UP046`, `UP047`, `RUF053`) ([#28362](astral-sh/ruff#28362)) - \[`pydocstyle`] Treat backslash-escaped `*args` and `**kwargs` as documented (`D417`) ([#29536](astral-sh/ruff#29536)) - \[`pylint`] Avoid false positive on starred elements (`PLE0643`) ([#29483](astral-sh/ruff#29483)) - \[`pylint`] Mark fixes unsafe when deleting comments (`PLR5501`, `PLW0120`) ([#29414](astral-sh/ruff#29414)) - \[`pyupgrade`] Mark fix unsafe when deleting comments (`UP035`) ([#29413](astral-sh/ruff#29413)) ##### Performance - Avoid intermediate names in lint name resolution ([#29506](astral-sh/ruff#29506)) - Prefilter bidirectional Unicode checks by UTF-8 leading bytes ([#29561](astral-sh/ruff#29561)) - Share postfix parsing and reduce expression copies ([#29480](astral-sh/ruff#29480)) ##### Configuration - \[`pylint`] Add a configurable allowlist for `magic-value-comparison` (`PLR2004`) ([#18961](astral-sh/ruff#18961)) ##### Documentation - Clarify documentation and correct stale guidance ([#29374](astral-sh/ruff#29374)) - \[`pyupgrade`] Remove mentions of variance related to fix safety (`UP040`, `UP047`) ([#29592](astral-sh/ruff#29592)) ##### Contributors - [@fixfon](https://github.com/fixfon) - [@MichaReiser](https://github.com/MichaReiser) - [@zaniebot](https://github.com/zaniebot) - [@FrancescoPezzella](https://github.com/FrancescoPezzella) - [@anishgirianish](https://github.com/anishgirianish) - [@rajveer3x](https://github.com/rajveer3x) - [@charliermarsh](https://github.com/charliermarsh) - [@LckyLike](https://github.com/LckyLke) - [@DaniBodor](https://github.com/DaniBodor) </details> --- ### Configuration 📅 **Schedule**: (in timezone America/Denver) - Branch creation - Between 02:00 AM and 06:59 AM, only on Tuesday (`* 2-6 * * 2`) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.lichtenwalter.site/rlichten/dir2text/pulls/100

charliermarsh added performance Potential performance improvement parser Related to the parser labels Oct 19, 2026

charliermarsh temporarily deployed to automations October 19, 2026 13:15 — with GitHub Actions Inactive

charliermarsh marked this pull request as ready for review October 19, 2026 14:00

charliermarsh requested review from MichaReiser and dhruvmanila as code owners October 19, 2026 14:00

charliermarsh mentioned this pull request Oct 19, 2026

Speed up identifier and keyword lexing #29463

Merged

charliermarsh added 2 commits October 19, 2026 15:10

Reduce atom-parser return value size

3c9679b

Share postfix parsing between identifier and atom paths

9743630

charliermarsh force-pushed the charlie/ruff-shared-postfix-atom branch from cd6f40b to 9743630 Compare October 19, 2026 15:11

charliermarsh temporarily deployed to automations October 19, 2026 15:12 — with GitHub Actions Inactive

charliermarsh added this pull request to stack #29499 October 19, 2026 17:56

MichaReiser approved these changes Oct 19, 2026

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charliermarsh mentioned this pull request Oct 19, 2026

Keep grouping metadata local to primary expression parsing #29507

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charliermarsh temporarily deployed to automations October 19, 2026 20:25 — with GitHub Actions Inactive

charliermarsh merged commit 85430a9 into main Oct 19, 2026
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charliermarsh deleted the charlie/ruff-shared-postfix-atom branch October 19, 2026 20:35

BrewTestBot mentioned this pull request Oct 22, 2026

ruff 0.17.2 Homebrew/homebrew-core#320513

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Share postfix parsing and reduce expression copies - #29480

Share postfix parsing and reduce expression copies#29480
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Memory usage report

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ruff-ecosystem results

Linter (stable)

Linter (preview)

Formatter (stable)

Formatter (preview)

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Merging this PR will improve performance by 6.32%

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