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>
613 lines
25 KiB
Text
613 lines
25 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/if.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..423,
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body: [
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Expr(
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StmtExpr {
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range: 0..16,
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value: If(
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ExprIf {
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range: 0..16,
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test: BooleanLiteral(
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ExprBooleanLiteral {
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range: 5..9,
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value: true,
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},
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),
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body: Name(
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ExprName {
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range: 0..1,
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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: 15..16,
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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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},
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),
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Expr(
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StmtExpr {
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range: 17..35,
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value: If(
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ExprIf {
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range: 17..35,
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test: Name(
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ExprName {
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range: 24..25,
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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: Call(
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ExprCall {
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range: 17..20,
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func: Name(
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ExprName {
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range: 17..18,
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id: "f",
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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: 18..20,
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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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orelse: NoneLiteral(
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ExprNoneLiteral {
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range: 31..35,
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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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Expr(
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StmtExpr {
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range: 36..61,
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value: If(
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ExprIf {
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range: 36..61,
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test: Name(
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ExprName {
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range: 41..42,
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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: 36..37,
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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: If(
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ExprIf {
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range: 48..61,
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test: Name(
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ExprName {
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range: 53..54,
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id: "d",
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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: 48..49,
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id: "c",
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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: 60..61,
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id: "e",
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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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Expr(
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StmtExpr {
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range: 62..84,
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value: If(
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ExprIf {
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range: 62..84,
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test: Compare(
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ExprCompare {
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range: 71..76,
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left: NumberLiteral(
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ExprNumberLiteral {
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range: 71..72,
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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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ops: [
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Lt,
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],
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comparators: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 75..76,
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value: Int(
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0,
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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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body: BinOp(
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ExprBinOp {
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range: 62..67,
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left: NumberLiteral(
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ExprNumberLiteral {
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range: 62..63,
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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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op: Add,
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right: Name(
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ExprName {
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range: 66..67,
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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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orelse: UnaryOp(
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ExprUnaryOp {
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range: 82..84,
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op: USub,
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operand: NumberLiteral(
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ExprNumberLiteral {
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range: 83..84,
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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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),
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},
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),
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Expr(
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StmtExpr {
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range: 85..108,
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value: If(
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ExprIf {
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range: 85..108,
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test: Name(
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ExprName {
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range: 96..97,
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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: BoolOp(
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ExprBoolOp {
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range: 85..92,
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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: 85..86,
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id: "a",
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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: 91..92,
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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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),
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orelse: BooleanLiteral(
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ExprBooleanLiteral {
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range: 103..108,
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value: 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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Expr(
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StmtExpr {
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range: 109..127,
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value: If(
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ExprIf {
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range: 109..127,
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test: Name(
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ExprName {
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range: 119..120,
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id: "y",
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ctx: Load,
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},
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),
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body: Compare(
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ExprCompare {
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range: 109..115,
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left: Name(
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ExprName {
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range: 109..110,
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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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LtE,
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],
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comparators: [
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Name(
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ExprName {
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range: 114..115,
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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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orelse: Name(
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ExprName {
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range: 126..127,
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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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Expr(
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StmtExpr {
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range: 128..154,
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value: If(
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ExprIf {
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range: 128..154,
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test: BoolOp(
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ExprBoolOp {
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range: 136..143,
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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: 136..137,
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id: "a",
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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: 142..143,
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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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),
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body: BooleanLiteral(
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ExprBooleanLiteral {
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range: 128..132,
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value: true,
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},
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),
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orelse: BooleanLiteral(
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ExprBooleanLiteral {
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range: 149..154,
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value: 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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Expr(
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StmtExpr {
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range: 155..171,
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value: Tuple(
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ExprTuple {
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range: 155..171,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 155..156,
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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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If(
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ExprIf {
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range: 158..171,
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test: Name(
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ExprName {
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range: 163..164,
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id: "a",
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ctx: Load,
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},
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),
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body: NumberLiteral(
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ExprNumberLiteral {
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range: 158..159,
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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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orelse: Name(
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ExprName {
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range: 170..171,
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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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ctx: Load,
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parenthesized: false,
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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: 214..240,
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value: If(
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ExprIf {
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range: 214..240,
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test: BooleanLiteral(
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ExprBooleanLiteral {
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range: 219..223,
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value: true,
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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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orelse: Lambda(
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ExprLambda {
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range: 229..240,
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parameters: Some(
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Parameters {
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range: 236..237,
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posonlyargs: [],
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args: [
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ParameterWithDefault {
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range: 236..237,
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parameter: Parameter {
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range: 236..237,
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name: Identifier {
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id: "y",
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range: 236..237,
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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: 239..240,
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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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),
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},
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),
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Expr(
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StmtExpr {
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range: 302..323,
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value: If(
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ExprIf {
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range: 302..323,
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test: Yield(
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ExprYield {
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range: 308..315,
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value: Some(
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Name(
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ExprName {
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range: 314..315,
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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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body: Name(
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ExprName {
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range: 302..303,
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id: "x",
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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: 322..323,
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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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),
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Expr(
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StmtExpr {
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range: 324..350,
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value: If(
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ExprIf {
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range: 324..350,
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test: YieldFrom(
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ExprYieldFrom {
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range: 330..342,
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value: Name(
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ExprName {
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range: 341..342,
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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: Name(
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ExprName {
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range: 324..325,
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id: "x",
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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: 349..350,
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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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),
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Expr(
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StmtExpr {
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range: 351..376,
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value: If(
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ExprIf {
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range: 351..376,
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test: Lambda(
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ExprLambda {
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range: 357..368,
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parameters: Some(
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Parameters {
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range: 364..365,
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posonlyargs: [],
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args: [
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ParameterWithDefault {
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range: 364..365,
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parameter: Parameter {
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range: 364..365,
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name: Identifier {
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id: "x",
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range: 364..365,
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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: 367..368,
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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: Name(
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ExprName {
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range: 351..352,
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id: "x",
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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: 375..376,
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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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),
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Expr(
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StmtExpr {
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range: 408..423,
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value: If(
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ExprIf {
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range: 409..422,
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test: Name(
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ExprName {
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range: 414..415,
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id: "y",
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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: 409..410,
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id: "x",
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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: 421..422,
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id: "z",
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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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```
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