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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>
461 lines
19 KiB
Text
461 lines
19 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/while.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..314,
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body: [
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While(
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StmtWhile {
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range: 0..16,
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test: Name(
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ExprName {
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range: 6..7,
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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: 13..16,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 13..16,
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},
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),
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},
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),
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],
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orelse: [],
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},
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),
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While(
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StmtWhile {
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range: 18..61,
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test: BoolOp(
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ExprBoolOp {
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range: 24..37,
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op: And,
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values: [
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Compare(
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ExprCompare {
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range: 25..30,
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left: Name(
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ExprName {
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range: 25..26,
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id: "x",
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ctx: Load,
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},
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),
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ops: [
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Gt,
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],
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comparators: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 29..30,
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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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),
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Name(
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ExprName {
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range: 36..37,
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id: "y",
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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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body: [
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Pass(
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StmtPass {
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range: 43..47,
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},
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),
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],
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orelse: [
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Expr(
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StmtExpr {
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range: 58..61,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 58..61,
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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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While(
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StmtWhile {
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range: 63..152,
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test: BoolOp(
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ExprBoolOp {
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range: 69..76,
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op: And,
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values: [
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Name(
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ExprName {
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range: 69..70,
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id: "x",
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ctx: Load,
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},
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),
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Name(
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ExprName {
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range: 75..76,
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id: "y",
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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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body: [
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Expr(
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StmtExpr {
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range: 82..85,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 82..85,
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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..111,
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value: Call(
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ExprCall {
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range: 90..111,
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func: Name(
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ExprName {
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range: 90..95,
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id: "print",
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ctx: Load,
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},
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),
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arguments: Arguments {
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range: 95..111,
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args: [
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StringLiteral(
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ExprStringLiteral {
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range: 96..110,
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value: StringLiteralValue {
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inner: Single(
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StringLiteral {
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range: 96..110,
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value: "Hello World!",
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flags: StringLiteralFlags {
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quote_style: Single,
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prefix: Empty,
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triple_quoted: false,
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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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keywords: [],
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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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orelse: [
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Expr(
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StmtExpr {
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range: 123..144,
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value: Call(
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ExprCall {
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range: 123..144,
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func: Name(
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ExprName {
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range: 123..128,
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id: "print",
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ctx: Load,
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},
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),
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arguments: Arguments {
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range: 128..144,
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args: [
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StringLiteral(
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ExprStringLiteral {
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range: 129..143,
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value: StringLiteralValue {
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inner: Single(
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StringLiteral {
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range: 129..143,
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value: "Olá, Mundo!",
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flags: StringLiteralFlags {
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quote_style: Single,
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prefix: Empty,
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triple_quoted: false,
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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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keywords: [],
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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: 149..152,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 149..152,
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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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While(
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StmtWhile {
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range: 154..171,
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test: Named(
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ExprNamed {
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range: 160..166,
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target: Name(
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ExprName {
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range: 160..161,
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id: "a",
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ctx: Store,
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},
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),
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value: Name(
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ExprName {
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range: 165..166,
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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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body: [
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Expr(
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StmtExpr {
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range: 168..171,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 168..171,
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},
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),
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},
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),
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],
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orelse: [],
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},
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),
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While(
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StmtWhile {
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range: 172..197,
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test: BoolOp(
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ExprBoolOp {
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range: 178..192,
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op: And,
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values: [
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Named(
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ExprNamed {
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range: 179..185,
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target: Name(
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ExprName {
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range: 179..180,
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id: "a",
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ctx: Store,
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},
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),
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value: Name(
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ExprName {
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range: 184..185,
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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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Name(
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ExprName {
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range: 191..192,
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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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body: [
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Expr(
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StmtExpr {
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range: 194..197,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 194..197,
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},
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),
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},
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),
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],
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orelse: [],
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},
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),
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While(
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StmtWhile {
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range: 198..220,
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test: Lambda(
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ExprLambda {
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range: 204..215,
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parameters: Some(
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Parameters {
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range: 211..212,
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posonlyargs: [],
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args: [
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ParameterWithDefault {
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range: 211..212,
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parameter: Parameter {
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range: 211..212,
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name: Identifier {
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id: "x",
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range: 211..212,
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},
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annotation: None,
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},
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default: None,
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},
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],
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vararg: None,
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kwonlyargs: [],
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kwarg: None,
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},
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),
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body: Name(
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ExprName {
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range: 214..215,
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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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body: [
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Expr(
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StmtExpr {
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range: 217..220,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 217..220,
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},
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),
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},
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),
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],
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orelse: [],
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},
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),
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While(
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StmtWhile {
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range: 221..239,
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test: Await(
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ExprAwait {
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range: 227..234,
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value: Name(
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ExprName {
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range: 233..234,
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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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body: [
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Expr(
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StmtExpr {
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range: 236..239,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 236..239,
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},
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),
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},
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),
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],
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orelse: [],
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},
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),
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If(
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StmtIf {
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range: 241..313,
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test: BooleanLiteral(
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ExprBooleanLiteral {
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range: 244..248,
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value: true,
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},
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),
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body: [
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While(
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StmtWhile {
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range: 254..298,
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test: Name(
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ExprName {
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range: 260..261,
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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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Pass(
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StmtPass {
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range: 271..275,
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},
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),
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],
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orelse: [
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Pass(
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StmtPass {
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range: 294..298,
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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: 299..313,
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test: None,
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body: [
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Pass(
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StmtPass {
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range: 309..313,
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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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)
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```
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