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Add support for NoReturn in auto-return-typing (#9206)
## Summary
Given a function like:
```python
def func(x: int):
if not x:
raise ValueError
else:
raise TypeError
```
We now correctly use `NoReturn` as the return type, rather than `None`.
Closes https://github.com/astral-sh/ruff/issues/9201.
This commit is contained in:
Charlie Marsh
GitHub
parent
f5d4019c2b
commit
5ccc21aea2
5 changed files with 420 additions and 164 deletions
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@ -182,3 +182,33 @@ class Foo(abc.ABC):
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return 1
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else:
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return 1.5
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def func(x: int):
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try:
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pass
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except:
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return 2
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def func(x: int):
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try:
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pass
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except:
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return 2
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else:
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return 3
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def func(x: int):
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if not x:
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raise ValueError
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else:
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raise TypeError
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def func(x: int):
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if not x:
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raise ValueError
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else:
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return 1
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@ -3,7 +3,7 @@ use rustc_hash::FxHashSet;
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use ruff_diagnostics::Edit;
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use ruff_python_ast::helpers::{
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implicit_return, pep_604_union, typing_optional, typing_union, ReturnStatementVisitor,
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pep_604_union, typing_optional, typing_union, ReturnStatementVisitor, Terminal,
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};
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use ruff_python_ast::visitor::Visitor;
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use ruff_python_ast::{self as ast, Expr, ExprContext};
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@ -57,6 +57,14 @@ pub(crate) fn auto_return_type(function: &ast::StmtFunctionDef) -> Option<AutoPy
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visitor.returns
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};
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// Determine the terminal behavior (i.e., implicit return, no return, etc.).
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let terminal = Terminal::from_function(function);
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// If every control flow path raises an exception, return `NoReturn`.
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if terminal == Some(Terminal::Raise) {
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return Some(AutoPythonType::NoReturn);
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}
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// Determine the return type of the first `return` statement.
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let Some((return_statement, returns)) = returns.split_first() else {
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return Some(AutoPythonType::Atom(PythonType::None));
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@ -80,7 +88,7 @@ pub(crate) fn auto_return_type(function: &ast::StmtFunctionDef) -> Option<AutoPy
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// if x > 0:
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// return 1
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// ```
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if implicit_return(function) {
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if terminal.is_none() {
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return_type = return_type.union(ResolvedPythonType::Atom(PythonType::None));
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}
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@ -94,6 +102,7 @@ pub(crate) fn auto_return_type(function: &ast::StmtFunctionDef) -> Option<AutoPy
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#[derive(Debug)]
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pub(crate) enum AutoPythonType {
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NoReturn,
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Atom(PythonType),
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Union(FxHashSet<PythonType>),
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}
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@ -111,6 +120,21 @@ impl AutoPythonType {
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target_version: PythonVersion,
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) -> Option<(Expr, Vec<Edit>)> {
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match self {
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AutoPythonType::NoReturn => {
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let (no_return_edit, binding) = importer
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.get_or_import_symbol(
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&ImportRequest::import_from("typing", "NoReturn"),
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at,
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semantic,
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)
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.ok()?;
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let expr = Expr::Name(ast::ExprName {
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id: binding,
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range: TextRange::default(),
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ctx: ExprContext::Load,
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});
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Some((expr, vec![no_return_edit]))
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}
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AutoPythonType::Atom(python_type) => {
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let expr = type_expr(python_type)?;
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Some((expr, vec![]))
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@ -495,4 +495,88 @@ auto_return_type.py:180:9: ANN201 [*] Missing return type annotation for public
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182 182 | return 1
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183 183 | else:
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auto_return_type.py:187:5: ANN201 [*] Missing return type annotation for public function `func`
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187 | def func(x: int):
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| ^^^^ ANN201
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188 | try:
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189 | pass
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= help: Add return type annotation: `int | None`
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ℹ Unsafe fix
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184 184 | return 1.5
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185 185 |
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186 186 |
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187 |-def func(x: int):
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187 |+def func(x: int) -> int | None:
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188 188 | try:
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189 189 | pass
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190 190 | except:
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auto_return_type.py:194:5: ANN201 [*] Missing return type annotation for public function `func`
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194 | def func(x: int):
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| ^^^^ ANN201
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195 | try:
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196 | pass
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|
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= help: Add return type annotation: `int`
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ℹ Unsafe fix
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191 191 | return 2
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192 192 |
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193 193 |
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194 |-def func(x: int):
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194 |+def func(x: int) -> int:
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195 195 | try:
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196 196 | pass
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197 197 | except:
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auto_return_type.py:203:5: ANN201 [*] Missing return type annotation for public function `func`
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203 | def func(x: int):
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| ^^^^ ANN201
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204 | if not x:
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205 | raise ValueError
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= help: Add return type annotation: `NoReturn`
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ℹ Unsafe fix
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151 151 |
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152 152 | import abc
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153 153 | from abc import abstractmethod
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154 |+from typing import NoReturn
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154 155 |
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155 156 |
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156 157 | class Foo(abc.ABC):
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--------------------------------------------------------------------------------
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200 201 | return 3
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201 202 |
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202 203 |
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203 |-def func(x: int):
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204 |+def func(x: int) -> NoReturn:
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204 205 | if not x:
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205 206 | raise ValueError
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206 207 | else:
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auto_return_type.py:210:5: ANN201 [*] Missing return type annotation for public function `func`
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210 | def func(x: int):
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| ^^^^ ANN201
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211 | if not x:
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212 | raise ValueError
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= help: Add return type annotation: `int`
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ℹ Unsafe fix
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207 207 | raise TypeError
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208 208 |
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209 209 |
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210 |-def func(x: int):
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210 |+def func(x: int) -> int:
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211 211 | if not x:
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212 212 | raise ValueError
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213 213 | else:
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@ -550,4 +550,96 @@ auto_return_type.py:180:9: ANN201 [*] Missing return type annotation for public
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182 182 | return 1
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183 183 | else:
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auto_return_type.py:187:5: ANN201 [*] Missing return type annotation for public function `func`
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187 | def func(x: int):
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| ^^^^ ANN201
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188 | try:
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189 | pass
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= help: Add return type annotation: `Optional[int]`
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ℹ Unsafe fix
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151 151 |
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152 152 | import abc
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153 153 | from abc import abstractmethod
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154 |+from typing import Optional
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154 155 |
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155 156 |
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156 157 | class Foo(abc.ABC):
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--------------------------------------------------------------------------------
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184 185 | return 1.5
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185 186 |
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186 187 |
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187 |-def func(x: int):
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188 |+def func(x: int) -> Optional[int]:
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188 189 | try:
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189 190 | pass
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190 191 | except:
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auto_return_type.py:194:5: ANN201 [*] Missing return type annotation for public function `func`
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194 | def func(x: int):
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| ^^^^ ANN201
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195 | try:
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196 | pass
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|
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= help: Add return type annotation: `int`
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ℹ Unsafe fix
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191 191 | return 2
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192 192 |
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193 193 |
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194 |-def func(x: int):
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194 |+def func(x: int) -> int:
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195 195 | try:
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196 196 | pass
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197 197 | except:
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auto_return_type.py:203:5: ANN201 [*] Missing return type annotation for public function `func`
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203 | def func(x: int):
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| ^^^^ ANN201
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204 | if not x:
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205 | raise ValueError
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= help: Add return type annotation: `NoReturn`
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ℹ Unsafe fix
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151 151 |
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152 152 | import abc
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153 153 | from abc import abstractmethod
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154 |+from typing import NoReturn
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154 155 |
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155 156 |
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156 157 | class Foo(abc.ABC):
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--------------------------------------------------------------------------------
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200 201 | return 3
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201 202 |
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202 203 |
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203 |-def func(x: int):
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204 |+def func(x: int) -> NoReturn:
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204 205 | if not x:
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205 206 | raise ValueError
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206 207 | else:
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auto_return_type.py:210:5: ANN201 [*] Missing return type annotation for public function `func`
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210 | def func(x: int):
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| ^^^^ ANN201
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211 | if not x:
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212 | raise ValueError
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|
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= help: Add return type annotation: `int`
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ℹ Unsafe fix
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207 207 | raise TypeError
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208 208 |
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209 209 |
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210 |-def func(x: int):
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210 |+def func(x: int) -> int:
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211 211 | if not x:
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212 212 | raise ValueError
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213 213 | else:
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@ -921,178 +921,204 @@ where
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}
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}
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/// Returns `true` if the function has an implicit return.
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pub fn implicit_return(function: &ast::StmtFunctionDef) -> bool {
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/// Returns `true` if the body may break via a `break` statement.
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fn sometimes_breaks(stmts: &[Stmt]) -> bool {
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for stmt in stmts {
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match stmt {
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Stmt::For(ast::StmtFor { body, orelse, .. }) => {
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if returns(body) {
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return false;
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}
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if sometimes_breaks(orelse) {
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return true;
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}
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}
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Stmt::While(ast::StmtWhile { body, orelse, .. }) => {
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if returns(body) {
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return false;
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}
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if sometimes_breaks(orelse) {
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return true;
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}
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}
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Stmt::If(ast::StmtIf {
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body,
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elif_else_clauses,
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..
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}) => {
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if std::iter::once(body)
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.chain(elif_else_clauses.iter().map(|clause| &clause.body))
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.any(|body| sometimes_breaks(body))
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{
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return true;
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}
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}
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Stmt::Match(ast::StmtMatch { cases, .. }) => {
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if cases.iter().any(|case| sometimes_breaks(&case.body)) {
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return true;
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}
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}
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Stmt::Try(ast::StmtTry {
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body,
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handlers,
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orelse,
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finalbody,
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..
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}) => {
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if sometimes_breaks(body)
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|| handlers.iter().any(|handler| {
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let ExceptHandler::ExceptHandler(ast::ExceptHandlerExceptHandler {
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body,
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..
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}) = handler;
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sometimes_breaks(body)
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})
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|| sometimes_breaks(orelse)
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|| sometimes_breaks(finalbody)
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{
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return true;
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}
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}
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Stmt::With(ast::StmtWith { body, .. }) => {
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if sometimes_breaks(body) {
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return true;
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}
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}
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Stmt::Break(_) => return true,
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Stmt::Return(_) => return false,
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Stmt::Raise(_) => return false,
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_ => {}
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}
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}
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false
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Terminal {
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/// Every path through the function ends with a `raise` statement.
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Raise,
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/// Every path through the function ends with a `return` (or `raise`) statement.
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Return,
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}
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/// Returns `true` if the body may break via a `break` statement.
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fn always_breaks(stmts: &[Stmt]) -> bool {
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for stmt in stmts {
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match stmt {
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Stmt::Break(_) => return true,
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Stmt::Return(_) => return false,
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Stmt::Raise(_) => return false,
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_ => {}
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}
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}
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false
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}
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/// Returns `true` if the body contains a branch that ends without an explicit `return` or
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/// `raise` statement.
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fn returns(stmts: &[Stmt]) -> bool {
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for stmt in stmts.iter().rev() {
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match stmt {
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Stmt::For(ast::StmtFor { body, orelse, .. }) => {
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if always_breaks(body) {
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return false;
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impl Terminal {
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/// Returns the [`Terminal`] behavior of the function, if it can be determined, or `None` if the
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/// function contains at least one control flow path that does not end with a `return` or `raise`
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/// statement.
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pub fn from_function(function: &ast::StmtFunctionDef) -> Option<Terminal> {
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/// Returns `true` if the body may break via a `break` statement.
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fn sometimes_breaks(stmts: &[Stmt]) -> bool {
|
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for stmt in stmts {
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match stmt {
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Stmt::For(ast::StmtFor { body, orelse, .. }) => {
|
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if returns(body).is_some() {
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return false;
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}
|
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if sometimes_breaks(orelse) {
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return true;
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}
|
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}
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if returns(body) {
|
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return true;
|
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Stmt::While(ast::StmtWhile { body, orelse, .. }) => {
|
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if returns(body).is_some() {
|
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return false;
|
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}
|
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if sometimes_breaks(orelse) {
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return true;
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}
|
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}
|
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if returns(orelse) && !sometimes_breaks(body) {
|
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return true;
|
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}
|
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}
|
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Stmt::While(ast::StmtWhile { body, orelse, .. }) => {
|
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if always_breaks(body) {
|
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return false;
|
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}
|
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if returns(body) {
|
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return true;
|
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}
|
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if returns(orelse) && !sometimes_breaks(body) {
|
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return true;
|
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}
|
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}
|
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Stmt::If(ast::StmtIf {
|
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body,
|
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elif_else_clauses,
|
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..
|
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}) => {
|
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if elif_else_clauses.iter().any(|clause| clause.test.is_none())
|
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&& std::iter::once(body)
|
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Stmt::If(ast::StmtIf {
|
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body,
|
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elif_else_clauses,
|
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..
|
||||
}) => {
|
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if std::iter::once(body)
|
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.chain(elif_else_clauses.iter().map(|clause| &clause.body))
|
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.all(|body| returns(body))
|
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{
|
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return true;
|
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.any(|body| sometimes_breaks(body))
|
||||
{
|
||||
return true;
|
||||
}
|
||||
}
|
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Stmt::Match(ast::StmtMatch { cases, .. }) => {
|
||||
if cases.iter().any(|case| sometimes_breaks(&case.body)) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::Try(ast::StmtTry {
|
||||
body,
|
||||
handlers,
|
||||
orelse,
|
||||
finalbody,
|
||||
..
|
||||
}) => {
|
||||
if sometimes_breaks(body)
|
||||
|| handlers.iter().any(|handler| {
|
||||
let ExceptHandler::ExceptHandler(ast::ExceptHandlerExceptHandler {
|
||||
body,
|
||||
..
|
||||
}) = handler;
|
||||
sometimes_breaks(body)
|
||||
})
|
||||
|| sometimes_breaks(orelse)
|
||||
|| sometimes_breaks(finalbody)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::With(ast::StmtWith { body, .. }) => {
|
||||
if sometimes_breaks(body) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::Break(_) => return true,
|
||||
Stmt::Return(_) => return false,
|
||||
Stmt::Raise(_) => return false,
|
||||
_ => {}
|
||||
}
|
||||
Stmt::Match(ast::StmtMatch { cases, .. }) => {
|
||||
// Note: we assume the `match` is exhaustive.
|
||||
if cases.iter().all(|case| returns(&case.body)) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::Try(ast::StmtTry {
|
||||
body,
|
||||
handlers,
|
||||
orelse,
|
||||
finalbody,
|
||||
..
|
||||
}) => {
|
||||
// If the `finally` block returns, the `try` block must also return.
|
||||
if returns(finalbody) {
|
||||
return true;
|
||||
}
|
||||
|
||||
// If the `body` or the `else` block returns, the `try` block must also return.
|
||||
if (returns(body) || returns(orelse))
|
||||
&& handlers.iter().all(|handler| {
|
||||
let ExceptHandler::ExceptHandler(ast::ExceptHandlerExceptHandler {
|
||||
body,
|
||||
..
|
||||
}) = handler;
|
||||
returns(body)
|
||||
})
|
||||
{
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::With(ast::StmtWith { body, .. }) => {
|
||||
if returns(body) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
Stmt::Return(_) => return true,
|
||||
Stmt::Raise(_) => return true,
|
||||
_ => {}
|
||||
}
|
||||
false
|
||||
}
|
||||
false
|
||||
|
||||
/// Returns `true` if the body may break via a `break` statement.
|
||||
fn always_breaks(stmts: &[Stmt]) -> bool {
|
||||
for stmt in stmts {
|
||||
match stmt {
|
||||
Stmt::Break(_) => return true,
|
||||
Stmt::Return(_) => return false,
|
||||
Stmt::Raise(_) => return false,
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
false
|
||||
}
|
||||
|
||||
/// Returns `true` if the body contains a branch that ends without an explicit `return` or
|
||||
/// `raise` statement.
|
||||
fn returns(stmts: &[Stmt]) -> Option<Terminal> {
|
||||
for stmt in stmts.iter().rev() {
|
||||
match stmt {
|
||||
Stmt::For(ast::StmtFor { body, orelse, .. })
|
||||
| Stmt::While(ast::StmtWhile { body, orelse, .. }) => {
|
||||
if always_breaks(body) {
|
||||
return None;
|
||||
}
|
||||
if let Some(terminal) = returns(body) {
|
||||
return Some(terminal);
|
||||
}
|
||||
if !sometimes_breaks(body) {
|
||||
if let Some(terminal) = returns(orelse) {
|
||||
return Some(terminal);
|
||||
}
|
||||
}
|
||||
}
|
||||
Stmt::If(ast::StmtIf {
|
||||
body,
|
||||
elif_else_clauses,
|
||||
..
|
||||
}) => {
|
||||
if elif_else_clauses.iter().any(|clause| clause.test.is_none()) {
|
||||
match Terminal::combine(std::iter::once(returns(body)).chain(
|
||||
elif_else_clauses.iter().map(|clause| returns(&clause.body)),
|
||||
)) {
|
||||
Some(Terminal::Raise) => return Some(Terminal::Raise),
|
||||
Some(Terminal::Return) => return Some(Terminal::Return),
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
Stmt::Match(ast::StmtMatch { cases, .. }) => {
|
||||
// Note: we assume the `match` is exhaustive.
|
||||
match Terminal::combine(cases.iter().map(|case| returns(&case.body))) {
|
||||
Some(Terminal::Raise) => return Some(Terminal::Raise),
|
||||
Some(Terminal::Return) => return Some(Terminal::Return),
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
Stmt::Try(ast::StmtTry {
|
||||
body,
|
||||
handlers,
|
||||
orelse,
|
||||
finalbody,
|
||||
..
|
||||
}) => {
|
||||
// If the `finally` block returns, the `try` block must also return.
|
||||
if let Some(terminal) = returns(finalbody) {
|
||||
return Some(terminal);
|
||||
}
|
||||
|
||||
// If the body returns, the `try` block must also return.
|
||||
if returns(body) == Some(Terminal::Return) {
|
||||
return Some(Terminal::Return);
|
||||
}
|
||||
|
||||
// If the else block and all the handlers return, the `try` block must also
|
||||
// return.
|
||||
if let Some(terminal) =
|
||||
Terminal::combine(std::iter::once(returns(orelse)).chain(
|
||||
handlers.iter().map(|handler| {
|
||||
let ExceptHandler::ExceptHandler(
|
||||
ast::ExceptHandlerExceptHandler { body, .. },
|
||||
) = handler;
|
||||
returns(body)
|
||||
}),
|
||||
))
|
||||
{
|
||||
return Some(terminal);
|
||||
}
|
||||
}
|
||||
Stmt::With(ast::StmtWith { body, .. }) => {
|
||||
if let Some(terminal) = returns(body) {
|
||||
return Some(terminal);
|
||||
}
|
||||
}
|
||||
Stmt::Return(_) => return Some(Terminal::Return),
|
||||
Stmt::Raise(_) => return Some(Terminal::Raise),
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
returns(&function.body)
|
||||
}
|
||||
|
||||
!returns(&function.body)
|
||||
/// Combine a series of [`Terminal`] operators.
|
||||
fn combine(iter: impl Iterator<Item = Option<Terminal>>) -> Option<Terminal> {
|
||||
iter.reduce(|acc, terminal| match (acc, terminal) {
|
||||
(Some(Self::Raise), Some(Self::Raise)) => Some(Self::Raise),
|
||||
(Some(_), Some(Self::Return)) => Some(Self::Return),
|
||||
(Some(Self::Return), Some(_)) => Some(Self::Return),
|
||||
_ => None,
|
||||
})
|
||||
.flatten()
|
||||
}
|
||||
}
|
||||
|
||||
/// A [`StatementVisitor`] that collects all `raise` statements in a function or method.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue