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[flake8-pytest-style] Add automatic fix for pytest-parametrize-values-wrong-type (PT007) #10461

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merged 6 commits into from
Mar 18, 2024
Merged

[flake8-pytest-style] Add automatic fix for pytest-parametrize-values-wrong-type (PT007) #10461

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7cf7515
Add fixes for PT007
autinerd Mar 18, 2024
ea85101
Convert generator-based fix to locator-based fix
autinerd Mar 18, 2024
b1f713c
Merge branch 'main' into ruff-pt007-fixes
charliermarsh Mar 18, 2024
b957996
replace `,)` with `]`
autinerd Mar 18, 2024
fcba378
Don't add , if single-element list has trailing comma already
charliermarsh Mar 18, 2024
978bdf5
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charliermarsh Mar 18, 2024
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1 change: 1 addition & 0 deletions crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT007.py
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Original file line number Diff line number Diff line change
Expand Up @@ -79,5 +79,6 @@ def test_single_list_of_lists(param):

@pytest.mark.parametrize("a", [1, 2])
@pytest.mark.parametrize(("b", "c"), ((3, 4), (5, 6)))
@pytest.mark.parametrize("d", [3,])
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Just one bugfix: the PR was adding a trailing comma here, which led to ,,

def test_multiple_decorators(a, b, c):
pass
159 changes: 149 additions & 10 deletions crates/ruff_linter/src/rules/flake8_pytest_style/rules/parametrize.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -182,11 +182,18 @@ pub struct PytestParametrizeValuesWrongType {
}

impl Violation for PytestParametrizeValuesWrongType {
const FIX_AVAILABILITY: FixAvailability = FixAvailability::Sometimes;

#[derive_message_formats]
fn message(&self) -> String {
let PytestParametrizeValuesWrongType { values, row } = self;
format!("Wrong values type in `@pytest.mark.parametrize` expected `{values}` of `{row}`")
}

fn fix_title(&self) -> Option<String> {
let PytestParametrizeValuesWrongType { values, row } = self;
Some(format!("Use `{values}` of `{row}` for parameter values"))
}
}

/// ## What it does
Expand Down Expand Up @@ -493,13 +500,46 @@ fn check_values(checker: &mut Checker, names: &Expr, values: &Expr) {
match values {
Expr::List(ast::ExprList { elts, .. }) => {
if values_type != types::ParametrizeValuesType::List {
checker.diagnostics.push(Diagnostic::new(
let mut diagnostic = Diagnostic::new(
PytestParametrizeValuesWrongType {
values: values_type,
row: values_row_type,
},
values.range(),
));
);
diagnostic.set_fix({
// Determine whether the last element has a trailing comma. Single-element
// tuples _require_ a trailing comma, so this is a single-element list
// _without_ a trailing comma, we need to insert one.
let needs_trailing_comma = if let [item] = elts.as_slice() {
SimpleTokenizer::new(
checker.locator().contents(),
TextRange::new(item.end(), values.end()),
)
.all(|token| token.kind != SimpleTokenKind::Comma)
} else {
false
};

// Replace `[` with `(`.
let values_start = Edit::replacement(
"(".into(),
values.start(),
values.start() + TextSize::from(1),
);
// Replace `]` with `)` or `,)`.
let values_end = Edit::replacement(
if needs_trailing_comma {
"),".into()
} else {
")".into()
},
values.end() - TextSize::from(1),
values.end(),
);
Fix::unsafe_edits(values_start, [values_end])
});
checker.diagnostics.push(diagnostic);
}

if is_multi_named {
Expand All @@ -508,14 +548,48 @@ fn check_values(checker: &mut Checker, names: &Expr, values: &Expr) {
}
Expr::Tuple(ast::ExprTuple { elts, .. }) => {
if values_type != types::ParametrizeValuesType::Tuple {
checker.diagnostics.push(Diagnostic::new(
let mut diagnostic = Diagnostic::new(
PytestParametrizeValuesWrongType {
values: values_type,
row: values_row_type,
},
values.range(),
));
);
diagnostic.set_fix({
// Determine whether a trailing comma is present due to the _requirement_
// that a single-element tuple must have a trailing comma, e.g., `(1,)`.
//
// If the trailing comma is on its own line, we intentionally ignore it,
// since the expression is already split over multiple lines, as in:
// ```python
// @pytest.mark.parametrize(
// (
// "x",
// ),
// )
// ```
let has_trailing_comma = elts.len() == 1
&& checker.locator().up_to(values.end()).chars().rev().nth(1) == Some(',');

// Replace `(` with `[`.
let values_start = Edit::replacement(
"[".into(),
values.start(),
values.start() + TextSize::from(1),
);
// Replace `)` or `,)` with `]`.
let start = if has_trailing_comma {
values.end() - TextSize::from(2)
} else {
values.end() - TextSize::from(1)
};
let values_end = Edit::replacement("]".into(), start, values.end());

Fix::unsafe_edits(values_start, [values_end])
});
checker.diagnostics.push(diagnostic);
}

if is_multi_named {
handle_value_rows(checker, elts, values_type, values_row_type);
}
Expand Down Expand Up @@ -604,26 +678,91 @@ fn handle_value_rows(
) {
for elt in elts {
match elt {
Expr::Tuple(_) => {
Expr::Tuple(ast::ExprTuple { elts, .. }) => {
if values_row_type != types::ParametrizeValuesRowType::Tuple {
checker.diagnostics.push(Diagnostic::new(
let mut diagnostic = Diagnostic::new(
PytestParametrizeValuesWrongType {
values: values_type,
row: values_row_type,
},
elt.range(),
));
);
diagnostic.set_fix({
// Determine whether a trailing comma is present due to the _requirement_
// that a single-element tuple must have a trailing comma, e.g., `(1,)`.
//
// If the trailing comma is on its own line, we intentionally ignore it,
// since the expression is already split over multiple lines, as in:
// ```python
// @pytest.mark.parametrize(
// (
// "x",
// ),
// )
// ```
let has_trailing_comma = elts.len() == 1
&& checker.locator().up_to(elt.end()).chars().rev().nth(1) == Some(',');

// Replace `(` with `[`.
let elt_start = Edit::replacement(
"[".into(),
elt.start(),
elt.start() + TextSize::from(1),
);
// Replace `)` or `,)` with `]`.
let start = if has_trailing_comma {
elt.end() - TextSize::from(2)
} else {
elt.end() - TextSize::from(1)
};
let elt_end = Edit::replacement("]".into(), start, elt.end());
Fix::unsafe_edits(elt_start, [elt_end])
});
checker.diagnostics.push(diagnostic);
}
}
Expr::List(_) => {
Expr::List(ast::ExprList { elts, .. }) => {
if values_row_type != types::ParametrizeValuesRowType::List {
checker.diagnostics.push(Diagnostic::new(
let mut diagnostic = Diagnostic::new(
PytestParametrizeValuesWrongType {
values: values_type,
row: values_row_type,
},
elt.range(),
));
);
diagnostic.set_fix({
// Determine whether the last element has a trailing comma. Single-element
// tuples _require_ a trailing comma, so this is a single-element list
// _without_ a trailing comma, we need to insert one.
let needs_trailing_comma = if let [item] = elts.as_slice() {
SimpleTokenizer::new(
checker.locator().contents(),
TextRange::new(item.end(), elt.end()),
)
.all(|token| token.kind != SimpleTokenKind::Comma)
} else {
false
};

// Replace `[` with `(`.
let elt_start = Edit::replacement(
"(".into(),
elt.start(),
elt.start() + TextSize::from(1),
);
// Replace `]` with `)` or `,)`.
let elt_end = Edit::replacement(
if needs_trailing_comma {
",)".into()
} else {
")".into()
},
elt.end() - TextSize::from(1),
elt.end(),
);
Fix::unsafe_edits(elt_start, [elt_end])
});
checker.diagnostics.push(diagnostic);
}
}
_ => {}
Expand Down
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