astral-sh/ruff

An extremely fast Python linter and code formatter, written in Rust.

Rust★ 50,738+169 that day#11 on trending

Analyzed November 7, 2026 at 6f86f83 (main) with jscpd v5 in 6.6s.

D47.7/100

Project health990,462 lines of code (L)

Duplication57

7% in rust, python, tsx, typescript, bash, javascript, dot, docker

Dead code57

6.2%

Complexity39

67.7%

The score is jscpd's own --health model: markup, data and text left out, tests kept. The numbers below are the trending scan's.

5.79%duplicated code · 47,379 of 818,659 lines

3,725clones in code

2,110code files of 5,098 scanned

6.97%duplicated over all files · 7,228 clones

Most complex files

Dead code 6.18% unused · 601 findings

crates/ruff_benchmark/resources/large/dataset.pyunused-file
crates/ruff_benchmark/resources/pydantic/types.pyunused-file
crates/ruff_benchmark/resources/numpy/ctypeslib.pyunused-file
crates/ty_vendored/ty_extensions/_internal.pyiunused-file
crates/ruff_python_parser/resources/valid/statement/match.pyunused-file
crates/ruff_benchmark/resources/typeis_narrowing.pyunused-file
crates/ty_vendored/ty_extensions/__init__.pyiunused-file
crates/ruff_python_parser/resources/valid/statement/function.pyunused-file
scripts/generate_known_standard_library.pyunused-file
crates/ruff_python_parser/resources/valid/statement/ambiguous_lpar_with_items.pyunused-file

The code number leaves out tests, fixtures, docs, examples, data files, styles, translations and vendored code, and 3 generated files: crates/ruff_linter/src/rules/ruff/rules/confusables.rs, crates/ruff_python_stdlib/src/sys/builtin_modules.rs, crates/ruff_python_stdlib/src/sys/known_stdlib.rs.

Largest clones in the code

6 lines in 26 placesrust54 tokens

crates/ruff_workspace/src/options.rs:1203–1208crates/ruff_workspace/src/options.rs:1313–1318crates/ruff_workspace/src/options.rs:1342–1347crates/ruff_workspace/src/options.rs:1374–1379crates/ruff_workspace/src/options.rs:1479–1484and 21 more

1203#[derive(
1204    Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
1205)]
1206#[serde(deny_unknown_fields, rename_all = "kebab-case")]
1207#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
1208pub struct Flake8BanditOptions {

1313#[derive(
1314    Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
1315)]
1316#[serde(deny_unknown_fields, rename_all = "kebab-case")]
1317#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
1318pub struct Flake8BooleanTrapOptions {

19 lines in 7 placesrust190 tokens
crates/ty_ide/src/hover.rs:2755–2773 crates/ty_ide/src/hover.rs:3037–3055 crates/ty_ide/src/hover.rs:3071–3089 crates/ty_ide/src/hover.rs:3105–3123 crates/ty_ide/src/hover.rs:3139–3157and 2 more
```
2755class MyClass:
2756    """some docs"""
2757"#,
2758);
2759
2760assert_snapshot!(test.hover(), @r#"
2761MyClass
2762---------------------------------------------
2763some docs
2764
```
First 10 of 19 lines.

219 lines in 2 placesrust1,069 tokens

crates/ruff_python_ast/src/visitor.rs:136–354crates/ruff_python_ast/src/visitor/transformer.rs:123–341

136match stmt {
137    Stmt::FunctionDef(ast::StmtFunctionDef {
138        parameters,
139        body,
140        decorator_list,
141        returns,
142        type_params,
143        ..
144    }) => {
145        for decorator in decorator_list {

First 10 of 219 lines.

7 more

7 lines in 15 placesrust71 tokens
crates/ty_ide/src/inlay_hints.rs:2532–2538 crates/ty_ide/src/inlay_hints.rs:4020–4026 crates/ty_ide/src/inlay_hints.rs:4229–4235 crates/ty_ide/src/inlay_hints.rs:4404–4410 crates/ty_ide/src/inlay_hints.rs:4609–4615and 10 more
22 lines in 11 placesrust95 tokens
crates/ty_server/src/server/api/requests/doc_highlights.rs:31–52 crates/ty_server/src/server/api/requests/goto_declaration.rs:30–51 crates/ty_server/src/server/api/requests/goto_definition.rs:31–52 crates/ty_server/src/server/api/requests/goto_implementation.rs:30–51 crates/ty_server/src/server/api/requests/goto_type_definition.rs:31–52and 6 more
301 lines in 2 placesrust922 tokens
crates/ruff_server/src/server/schedule/thread/priority.rs:1–301 crates/ty_server/src/server/schedule/thread/priority.rs:1–301
7 lines in 19 placesrust50 tokens
crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_abspath.rs:1–7 crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_basename.rs:1–7 crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_dirname.rs:1–7 crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_exists.rs:1–7 crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_expanduser.rs:1–7and 14 more
12 lines in 13 placesrust63 tokens
crates/ty_ide/src/find_references.rs:1034–1045 crates/ty_ide/src/find_references.rs:1062–1073 crates/ty_ide/src/find_references.rs:1090–1101 crates/ty_ide/src/find_references.rs:1124–1135 crates/ty_ide/src/goto_declaration.rs:1625–1636and 8 more
14 lines in 11 placesrust73 tokens
crates/ruff_linter/src/rules/airflow/mod.rs:3–16 crates/ruff_linter/src/rules/flake8_blind_except/mod.rs:2–15 crates/ruff_linter/src/rules/flake8_commas/mod.rs:2–15 crates/ruff_linter/src/rules/flake8_debugger/mod.rs:3–16 crates/ruff_linter/src/rules/flake8_fixme/mod.rs:1–14and 6 more
153 lines in 2 placesrust717 tokens
crates/ruff_python_ast/src/visitor.rs:363–515 crates/ruff_python_ast/src/visitor/transformer.rs:350–502

Largest clones over all files, tests and data included

21 lines in 3 placesrusttests3,458 tokens

crates/ruff_annotate_snippets/tests/rustc_tests.rs:2283–2303crates/ruff_annotate_snippets/tests/rustc_tests.rs:2325–2345crates/ruff_annotate_snippets/tests/rustc_tests.rs:2369–2389

2283fn long_span_shortest() {
2284    // tests/ui/diagnostic-width/long-span.rs
2285    let source = r#"
2286const C: u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, …
2287
2288fn main() {}
2289"#;
2290    let input = &[Level::ERROR
2291        .primary_title("mismatched types")
2292        .id("E0038")

First 10 of 21 lines.

177 lines in 86 placestomldocs and examples57 tokens

crates/ty_python_semantic/resources/mdtest/annotations/intersection_types.md:113–289crates/ty_python_semantic/resources/mdtest/call/constructor.md:289–1260crates/ty_python_semantic/resources/mdtest/call/constructor.md:591–1298crates/ty_python_semantic/resources/mdtest/call/constructor.md:994–1613crates/ty_python_semantic/resources/mdtest/call/constructor.md:1083–1634and 81 more

113python-version = "3.12"
114```
115
116```py
117class A: ...
118class B: ...
119class Box[T]: ...
120
121type AAndB = A & B
122type NotA = ~A

289python-version = "3.12"
290```
291
292### A decorator returning the enclosing class
293
294A decorator can replace `__new__` with the type of its implicit `cls` parameter, making the
295constructor refer back to itself. Regression test for <https://github.com/astral-sh/ty/issues/4347>.
296
297```py
298from collections.abc import Callable

First 10 of 177 lines, the second copy on the right.

24 lines in 2 placesrusttests3,483 tokens

crates/ruff_annotate_snippets/tests/rustc_tests.rs:2283–2306crates/ruff_annotate_snippets/tests/rustc_tests.rs:2413–2436

2283fn long_span_shortest() {
2284    // tests/ui/diagnostic-width/long-span.rs
2285    let source = r#"
2286const C: u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, …
2287
2288fn main() {}
2289"#;
2290    let input = &[Level::ERROR
2291        .primary_title("mismatched types")
2292        .id("E0038")

First 10 of 24 lines.

22 lines in 17 placesmarkuptests172 tokens
crates/ruff_annotate_snippets/tests/color/ann_eof.ascii.term.svg:1–22 crates/ruff_annotate_snippets/tests/color/ensure_emoji_highlight_width.ascii.term.svg:1–22 crates/ruff_annotate_snippets/tests/color/fold_bad_origin_line.ascii.term.svg:1–22 crates/ruff_annotate_snippets/tests/color/fold_bad_origin_line.unicode.term.svg:1–22 crates/ruff_annotate_snippets/tests/color/fold_leading.ascii.term.svg:1–22and 12 more
6 lines in 37 placesmarkdowndocs and examples51 tokens
crates/ty/docs/rules.md:285–290 crates/ty/docs/rules.md:381–386 crates/ty/docs/rules.md:414–419 crates/ty/docs/rules.md:448–453 crates/ty/docs/rules.md:812–817and 32 more

By format, code only

Format	Files	Lines	Clones	Duplicated lines	Duplication
rust	1,857	788,822	3,678	46,792	5.93%
python	203	22,169	37	347	1.57%
tsx	29	6,533	9	213	3.26%
typescript	13	734	1	27	3.68%
bash	8	401	0	0	0%

By format, all files

Format	Files	Lines	Clones	Duplicated lines	Duplication
rust	1,999	856,678	4,802	62,227	7.26%
python	1,865	259,880	1,074	15,505	5.97%
text	165	13,358	395	2,391	17.9%
markdown	655	316,671	352	17,025	5.38%
toml	147	8,448	260	3,200	37.88%
markup	83	4,258	170	2,461	57.8%
yaml	43	6,997	93	1,055	15.08%
txt	22	19,373	69	546	2.82%
tsx	29	6,533	9	213	3.26%
css	4	583	2	132	22.64%

Trending appearances

Day	Rank	Stars	Files	Lines	Clones	All files	Code	Health	Commit
Nov 7, 2026	#11	50,738 (+169)	5,098	1,504,268	7,228	6.97%	5.79%	D 47.7	`6f86f83`

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