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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>
227 lines
9.2 KiB
Text
227 lines
9.2 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/expressions/attribute.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..90,
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body: [
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Expr(
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StmtExpr {
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range: 0..10,
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value: Attribute(
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ExprAttribute {
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range: 0..10,
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value: Name(
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ExprName {
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range: 0..5,
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id: "value",
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ctx: Load,
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},
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),
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attr: Identifier {
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id: "attr",
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range: 6..10,
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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: 11..23,
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value: Call(
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ExprCall {
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range: 11..23,
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func: Attribute(
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ExprAttribute {
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range: 11..21,
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value: Name(
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ExprName {
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range: 11..16,
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id: "value",
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ctx: Load,
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},
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),
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attr: Identifier {
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id: "attr",
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range: 17..21,
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},
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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: 21..23,
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args: [],
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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: 24..36,
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value: Attribute(
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ExprAttribute {
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range: 24..36,
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value: Call(
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ExprCall {
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range: 24..31,
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func: Name(
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ExprName {
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range: 24..29,
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id: "value",
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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: 29..31,
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args: [],
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keywords: [],
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},
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},
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),
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attr: Identifier {
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id: "attr",
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range: 32..36,
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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: 37..55,
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value: Attribute(
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ExprAttribute {
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range: 37..55,
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value: Call(
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ExprCall {
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range: 37..51,
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func: Attribute(
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ExprAttribute {
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range: 37..49,
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value: Call(
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ExprCall {
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range: 37..44,
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func: Name(
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ExprName {
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range: 37..42,
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id: "value",
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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: 42..44,
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args: [],
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keywords: [],
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},
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},
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),
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attr: Identifier {
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id: "attr",
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range: 45..49,
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},
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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: 49..51,
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args: [],
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keywords: [],
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},
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},
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),
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attr: Identifier {
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id: "foo",
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range: 52..55,
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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: 56..70,
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value: Attribute(
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ExprAttribute {
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range: 56..70,
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value: Attribute(
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ExprAttribute {
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range: 56..66,
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value: Name(
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ExprName {
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range: 56..61,
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id: "value",
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ctx: Load,
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},
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),
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attr: Identifier {
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id: "attr",
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range: 62..66,
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},
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ctx: Load,
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},
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),
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attr: Identifier {
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id: "foo",
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range: 67..70,
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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: 71..89,
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value: Attribute(
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ExprAttribute {
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range: 71..89,
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value: Call(
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ExprCall {
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range: 71..85,
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func: Attribute(
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ExprAttribute {
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range: 71..83,
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value: Name(
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ExprName {
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range: 72..77,
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id: "value",
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ctx: Load,
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},
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),
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attr: Identifier {
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id: "attr",
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range: 79..83,
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},
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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: 83..85,
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args: [],
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keywords: [],
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},
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},
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),
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attr: Identifier {
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id: "foo",
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range: 86..89,
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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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