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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>
299 lines
12 KiB
Text
299 lines
12 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/delete.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..122,
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body: [
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Delete(
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StmtDelete {
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range: 0..5,
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targets: [
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Name(
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ExprName {
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range: 4..5,
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id: "x",
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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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Delete(
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StmtDelete {
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range: 6..13,
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targets: [
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Name(
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ExprName {
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range: 11..12,
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id: "x",
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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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Delete(
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StmtDelete {
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range: 14..23,
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targets: [
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Name(
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ExprName {
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range: 18..19,
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id: "a",
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ctx: Del,
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},
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),
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Name(
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ExprName {
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range: 21..22,
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id: "b",
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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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Delete(
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StmtDelete {
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range: 24..40,
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targets: [
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Name(
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ExprName {
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range: 28..29,
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id: "a",
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ctx: Del,
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},
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),
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Tuple(
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ExprTuple {
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range: 31..37,
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elts: [
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Name(
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ExprName {
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range: 32..33,
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id: "b",
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ctx: Del,
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},
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),
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Name(
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ExprName {
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range: 35..36,
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id: "c",
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ctx: Del,
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},
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),
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],
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ctx: Del,
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parenthesized: true,
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},
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),
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Name(
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ExprName {
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range: 39..40,
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id: "d",
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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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Delete(
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StmtDelete {
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range: 41..51,
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targets: [
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List(
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ExprList {
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range: 45..51,
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elts: [
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Name(
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ExprName {
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range: 46..47,
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id: "a",
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ctx: Del,
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},
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),
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Name(
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ExprName {
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range: 49..50,
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id: "b",
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ctx: Del,
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},
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),
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],
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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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Delete(
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StmtDelete {
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range: 52..70,
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targets: [
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List(
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ExprList {
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range: 56..70,
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elts: [
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Name(
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ExprName {
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range: 57..58,
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id: "a",
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ctx: Del,
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},
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),
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List(
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ExprList {
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range: 60..66,
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elts: [
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Name(
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ExprName {
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range: 61..62,
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id: "b",
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ctx: Del,
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},
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),
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Name(
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ExprName {
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range: 64..65,
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id: "c",
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ctx: Del,
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},
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),
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],
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ctx: Del,
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},
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),
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Name(
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ExprName {
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range: 68..69,
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id: "d",
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ctx: Del,
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},
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),
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],
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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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Delete(
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StmtDelete {
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range: 71..78,
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targets: [
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Attribute(
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ExprAttribute {
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range: 75..78,
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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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attr: Identifier {
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id: "y",
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range: 77..78,
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},
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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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Delete(
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StmtDelete {
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range: 79..87,
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targets: [
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Subscript(
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ExprSubscript {
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range: 83..87,
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value: Name(
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ExprName {
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range: 83..84,
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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: Name(
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ExprName {
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range: 85..86,
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id: "y",
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ctx: Load,
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},
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),
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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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Delete(
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StmtDelete {
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range: 88..121,
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targets: [
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Tuple(
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ExprTuple {
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range: 92..121,
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elts: [
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Name(
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ExprName {
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range: 98..99,
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id: "x",
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ctx: Del,
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},
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),
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Attribute(
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ExprAttribute {
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range: 105..108,
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value: Name(
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ExprName {
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range: 105..106,
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id: "x",
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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: "y",
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range: 107..108,
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},
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ctx: Del,
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},
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),
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Subscript(
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ExprSubscript {
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range: 114..118,
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value: Name(
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ExprName {
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range: 114..115,
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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: Name(
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ExprName {
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range: 116..117,
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id: "y",
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ctx: Load,
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},
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),
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ctx: Del,
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},
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),
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],
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ctx: Del,
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parenthesized: true,
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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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