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(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>
248 lines
8.2 KiB
Text
248 lines
8.2 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/statement/simple.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..172,
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body: [
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Continue(
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StmtContinue {
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range: 61..69,
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},
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),
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Break(
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StmtBreak {
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range: 70..75,
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},
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),
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If(
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StmtIf {
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range: 77..86,
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test: Name(
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ExprName {
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range: 80..81,
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id: "x",
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ctx: Load,
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},
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),
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body: [
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Expr(
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StmtExpr {
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range: 83..86,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 83..86,
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},
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),
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},
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),
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],
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elif_else_clauses: [],
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},
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),
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If(
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StmtIf {
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range: 87..100,
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test: BooleanLiteral(
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ExprBooleanLiteral {
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range: 90..94,
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value: true,
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},
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),
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body: [
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Pass(
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StmtPass {
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range: 96..100,
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},
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),
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],
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elif_else_clauses: [],
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},
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),
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Expr(
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StmtExpr {
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range: 101..102,
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 101..102,
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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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),
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Expr(
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StmtExpr {
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range: 104..105,
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 104..105,
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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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Pass(
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StmtPass {
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range: 107..111,
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},
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),
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Expr(
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StmtExpr {
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range: 112..113,
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 112..113,
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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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),
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Expr(
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StmtExpr {
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range: 115..118,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 115..118,
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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: 120..133,
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value: If(
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ExprIf {
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range: 120..133,
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test: Name(
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ExprName {
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range: 125..126,
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id: "b",
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ctx: Load,
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},
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),
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body: Name(
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ExprName {
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range: 120..121,
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id: "a",
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ctx: Load,
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},
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),
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orelse: Name(
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ExprName {
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range: 132..133,
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id: "c",
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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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If(
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StmtIf {
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range: 135..157,
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test: Name(
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ExprName {
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range: 138..139,
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id: "c",
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ctx: Load,
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},
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),
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body: [
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Expr(
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StmtExpr {
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range: 141..142,
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value: Name(
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ExprName {
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range: 141..142,
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id: "B",
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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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Delete(
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StmtDelete {
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range: 144..149,
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targets: [
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Name(
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ExprName {
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range: 148..149,
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id: "A",
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ctx: Del,
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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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elif_else_clauses: [
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ElifElseClause {
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range: 150..157,
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test: None,
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body: [
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Expr(
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StmtExpr {
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range: 156..157,
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value: Name(
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ExprName {
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range: 156..157,
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id: "C",
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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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),
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If(
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StmtIf {
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range: 158..171,
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test: Name(
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ExprName {
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range: 161..162,
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id: "x",
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ctx: Load,
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},
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),
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body: [
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Expr(
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StmtExpr {
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range: 164..171,
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value: Yield(
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ExprYield {
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range: 164..171,
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value: Some(
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Name(
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ExprName {
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range: 170..171,
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id: "x",
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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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elif_else_clauses: [],
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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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