style: use PEP604 typing syntax by 2bndy5 · Pull Request #187 · cpp-linter/cpp-linter

2bndy5 · 2026-02-06T07:42:38Z

See PEP604 which was adopted/preferred as of Python 3.10.

follow-up to build: drop python 3.9 #186

Summary by CodeRabbit

Refactor
- Modernized type annotations across the codebase to use newer Python union and generic syntax (PEP 604/585). No runtime behavior changes; improves maintainability and type-checking.
Tests
- Updated test type annotations to match the new typing style. No test logic changes.

codecov · 2026-02-06T07:55:50Z

Codecov Report

❌ Patch coverage is 98.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.30%. Comparing base (2f02972) to head (1edb6cf).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
cpp_linter/common_fs/__init__.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   98.30%   98.30%   -0.01%     
==========================================
  Files          24       24              
  Lines        1947     1942       -5     
==========================================
- Hits         1914     1909       -5     
  Misses         33       33

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See [PEP604] which was adopted/preferred as of Python 3.10. [PEP604]: https://peps.python.org/pep-0604/

coderabbitai · 2026-02-06T08:41:18Z

Walkthrough

This PR modernizes type annotations project-wide, replacing typing module aliases (List, Dict, Optional, Union, Tuple) with Python 3.9+ built-in generics (list, dict, tuple) and PEP 604 union syntax (X | None), updating signatures, attributes, and test annotations accordingly.

Changes

Cohort / File(s)	Summary
Clang Tools Core `cpp_linter/clang_tools/__init__.py`, `cpp_linter/clang_tools/clang_format.py`, `cpp_linter/clang_tools/clang_tidy.py`, `cpp_linter/clang_tools/patcher.py`	Replaced typing aliases with built-in generics and PEP 604 unions across public APIs, class attributes and function signatures (e.g., `Optional[T]` → `T
File System & Filtering `cpp_linter/common_fs/__init__.py`, `cpp_linter/common_fs/file_filter.py`	Modernized FileObj and FileFilter type hints (lists of ints, ranges, diff chunks, optional advice types) to built-in generics and union syntax; updated method signatures/returns accordingly.
Git Integration `cpp_linter/git/__init__.py`, `cpp_linter/git/git_str.py`	Converted get_sha/get_diff/parse_diff/parse_patch signatures and internal annotations to built-in generics and PEP 604 unions; adjusted some commit/peel usages and parse error casting formatting.
REST API Layer `cpp_linter/rest_api/__init__.py`, `cpp_linter/rest_api/github_api.py`	Updated RestApiClient and GitHub API method signatures, payload typings, and internal list/dict annotations to `list[...]`, `dict[...]`, and union syntax for optional params/returns.
CLI Configuration `cpp_linter/cli.py`	Replaced typing aliases in Args dataclass and parser helpers with built-in generics and union syntax (e.g., `diff_base`, `extensions`, `jobs`, `_parser_args`, `_parse_jobs`).
Tests `tests/capture_tools_output/`, `tests/ignored_paths/`, `tests/test_cli_args.py`, `tests/test_misc.py`, `tests/test_rate_limits.py`	Harmonized test parameter and local type hints to built-in generics and union syntax; no behavioral changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

build: drop python 3.9 #186: Wholesale migration of type hints to PEP 604 and built-in generics—overlaps with the typing modernization in this PR.
feat: capture and output clang version used #124: Changes to ClangVersions and capture_clang_tools_output signatures and plumbing clang version data are directly related to updates in clang_tools here.

Suggested labels

enhancement

Suggested reviewers

shenxianpeng

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 69.77% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main objective: updating the codebase to use PEP 604 typing syntax (union operator \|) instead of older Optional/Union imports from the typing module.

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Create PR with unit tests
Post copyable unit tests in a comment
Commit unit tests in branch pep604-typing

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does not bump any deps though; just removes old locks related to python 3.9

2bndy5 mentioned this pull request Feb 6, 2026

perf: small optimizations to get_diff() #185

Merged

style: use PEP604 typing syntax

8be3a64

See [PEP604] which was adopted/preferred as of Python 3.10. [PEP604]: https://peps.python.org/pep-0604/

2bndy5 force-pushed the pep604-typing branch from 4e58823 to 8be3a64 Compare February 6, 2026 08:37

2bndy5 marked this pull request as ready for review February 6, 2026 08:37

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2bndy5 added 2 commits February 6, 2026 00:55

revise cli.py

5690278

update lock file

1edb6cf

does not bump any deps though; just removes old locks related to python 3.9

cpp-linter deleted a comment from coderabbitai Bot Feb 6, 2026

2bndy5 merged commit 9a5897a into main Feb 6, 2026
43 checks passed

2bndy5 deleted the pep604-typing branch February 6, 2026 09:14

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style: use PEP604 typing syntax#187

style: use PEP604 typing syntax#187
2bndy5 merged 3 commits into
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2bndy5 commented Feb 6, 2026 •

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2bndy5 commented Feb 6, 2026 •

edited by coderabbitai Bot

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