mirror of
https://github.com/astral-sh/ruff.git
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13ffb5bc19
(Supersedes #9152, authored by @LaBatata101) ## Summary This PR replaces the current parser generated from LALRPOP to a hand-written recursive descent parser. It also updates the grammar for [PEP 646](https://peps.python.org/pep-0646/) so that the parser outputs the correct AST. For example, in `data[*x]`, the index expression is now a tuple with a single starred expression instead of just a starred expression. Beyond the performance improvements, the parser is also error resilient and can provide better error messages. The behavior as seen by any downstream tools isn't changed. That is, the linter and formatter can still assume that the parser will _stop_ at the first syntax error. This will be updated in the following months. For more details about the change here, refer to the PR corresponding to the individual commits and the release blog post. ## Test Plan Write _lots_ and _lots_ of tests for both valid and invalid syntax and verify the output. ## Acknowledgements - @MichaReiser for reviewing 100+ parser PRs and continuously providing guidance throughout the project - @LaBatata101 for initiating the transition to a hand-written parser in #9152 - @addisoncrump for implementing the fuzzer which helped [catch](https://github.com/astral-sh/ruff/pull/10903) [a](https://github.com/astral-sh/ruff/pull/10910) [lot](https://github.com/astral-sh/ruff/pull/10966) [of](https://github.com/astral-sh/ruff/pull/10896) [bugs](https://github.com/astral-sh/ruff/pull/10877) --------- Co-authored-by: Victor Hugo Gomes <labatata101@linuxmail.org> Co-authored-by: Micha Reiser <micha@reiser.io>
655 lines
27 KiB
Text
655 lines
27 KiB
Text
---
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source: crates/ruff_python_parser/tests/fixtures.rs
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input_file: crates/ruff_python_parser/resources/valid/expressions/slice.py
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---
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## AST
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```
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Module(
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ModModule {
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range: 0..211,
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body: [
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Expr(
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StmtExpr {
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range: 23..27,
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value: Subscript(
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ExprSubscript {
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range: 23..27,
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value: Name(
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ExprName {
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range: 23..24,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 25..26,
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lower: None,
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upper: None,
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 28..33,
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value: Subscript(
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ExprSubscript {
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range: 28..33,
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value: Name(
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ExprName {
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range: 28..29,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 30..32,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 30..31,
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value: Int(
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1,
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),
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},
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),
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),
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upper: None,
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 34..39,
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value: Subscript(
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ExprSubscript {
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range: 34..39,
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value: Name(
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ExprName {
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range: 34..35,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 36..38,
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lower: None,
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 37..38,
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value: Int(
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2,
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),
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},
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),
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),
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 40..46,
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value: Subscript(
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ExprSubscript {
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range: 40..46,
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value: Name(
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ExprName {
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range: 40..41,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 42..45,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 42..43,
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value: Int(
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1,
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),
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},
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),
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),
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 44..45,
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value: Int(
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2,
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),
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},
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),
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),
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 47..52,
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value: Subscript(
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ExprSubscript {
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range: 47..52,
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value: Name(
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ExprName {
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range: 47..48,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 49..51,
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lower: None,
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upper: None,
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 53..59,
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value: Subscript(
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ExprSubscript {
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range: 53..59,
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value: Name(
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ExprName {
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range: 53..54,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 55..58,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 55..56,
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value: Int(
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1,
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),
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},
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),
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),
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upper: None,
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 60..66,
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value: Subscript(
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ExprSubscript {
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range: 60..66,
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value: Name(
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ExprName {
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range: 60..61,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 62..65,
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lower: None,
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 63..64,
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value: Int(
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2,
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),
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},
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),
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),
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 67..74,
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value: Subscript(
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ExprSubscript {
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range: 67..74,
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value: Name(
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ExprName {
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range: 67..68,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 69..73,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 69..70,
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value: Int(
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1,
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),
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},
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),
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),
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 71..72,
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value: Int(
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2,
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),
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},
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),
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),
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 75..81,
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value: Subscript(
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ExprSubscript {
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range: 75..81,
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value: Name(
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ExprName {
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range: 75..76,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 77..80,
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lower: None,
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upper: None,
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step: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 79..80,
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value: Int(
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3,
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),
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},
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),
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),
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 82..89,
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value: Subscript(
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ExprSubscript {
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range: 82..89,
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value: Name(
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ExprName {
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range: 82..83,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 84..88,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 84..85,
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value: Int(
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1,
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),
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},
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),
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),
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upper: None,
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step: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 87..88,
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value: Int(
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3,
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),
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},
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),
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),
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 90..97,
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value: Subscript(
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ExprSubscript {
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range: 90..97,
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value: Name(
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ExprName {
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range: 90..91,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 92..96,
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lower: None,
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 93..94,
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value: Int(
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2,
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),
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},
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),
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),
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step: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 95..96,
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value: Int(
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3,
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),
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},
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),
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),
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 98..106,
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value: Subscript(
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ExprSubscript {
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range: 98..106,
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value: Name(
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ExprName {
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range: 98..99,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 100..105,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 100..101,
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value: Int(
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1,
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),
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},
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),
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),
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 102..103,
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value: Int(
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2,
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),
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},
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),
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),
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step: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 104..105,
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value: Int(
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3,
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),
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},
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),
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),
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 127..136,
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value: Subscript(
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ExprSubscript {
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range: 127..136,
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value: Name(
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ExprName {
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range: 127..128,
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id: "x",
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ctx: Load,
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},
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),
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slice: Named(
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ExprNamed {
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range: 129..135,
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target: Name(
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ExprName {
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range: 129..130,
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id: "y",
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ctx: Store,
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},
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),
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 134..135,
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value: Int(
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2,
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),
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},
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),
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 137..149,
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value: Subscript(
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ExprSubscript {
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range: 137..149,
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value: Name(
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ExprName {
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range: 137..138,
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id: "x",
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ctx: Load,
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},
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),
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slice: Slice(
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ExprSlice {
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range: 139..148,
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lower: Some(
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Named(
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ExprNamed {
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range: 140..146,
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target: Name(
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ExprName {
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range: 140..141,
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id: "y",
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ctx: Store,
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},
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),
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 145..146,
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value: Int(
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2,
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),
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},
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),
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},
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),
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),
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upper: None,
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step: None,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 150..160,
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value: Subscript(
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ExprSubscript {
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range: 150..160,
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value: Name(
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ExprName {
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range: 150..151,
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id: "x",
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 152..159,
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elts: [
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Named(
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ExprNamed {
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range: 152..158,
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target: Name(
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ExprName {
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range: 152..153,
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id: "y",
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ctx: Store,
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},
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),
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 157..158,
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value: Int(
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2,
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),
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},
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),
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 202..210,
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value: Subscript(
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ExprSubscript {
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range: 202..210,
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value: Name(
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ExprName {
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range: 202..203,
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id: "x",
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 204..209,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 204..205,
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value: Int(
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1,
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),
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},
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),
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Slice(
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ExprSlice {
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range: 206..208,
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lower: None,
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 207..208,
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value: Int(
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2,
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),
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},
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),
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),
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step: None,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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],
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},
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)
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```
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