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Add new mixed_attributes_style
lint
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@ -5423,6 +5423,7 @@ Released 2018-09-13
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[`missing_spin_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_spin_loop
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[`missing_trait_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_trait_methods
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[`mistyped_literal_suffixes`]: https://rust-lang.github.io/rust-clippy/master/index.html#mistyped_literal_suffixes
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[`mixed_attributes_style`]: https://rust-lang.github.io/rust-clippy/master/index.html#mixed_attributes_style
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[`mixed_case_hex_literals`]: https://rust-lang.github.io/rust-clippy/master/index.html#mixed_case_hex_literals
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[`mixed_read_write_in_expression`]: https://rust-lang.github.io/rust-clippy/master/index.html#mixed_read_write_in_expression
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[`mod_module_files`]: https://rust-lang.github.io/rust-clippy/master/index.html#mod_module_files
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@ -485,6 +485,33 @@ declare_clippy_lint! {
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"usage of `cfg_attr(clippy, allow(clippy::lint))` instead of `allow(clippy::lint)`"
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}
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declare_clippy_lint! {
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/// ### What it does
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/// Checks that an item has only one kind of attributes.
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///
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/// ### Why is this bad?
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/// Having both kinds of attributes makes it more complicated to read code.
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///
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/// ### Example
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/// ```no_run
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/// #[cfg(linux)]
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/// pub fn foo() {
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/// #![cfg(windows)]
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/// }
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/// ```
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/// Use instead:
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/// ```no_run
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/// #[cfg(linux)]
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/// #[cfg(windows)]
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/// pub fn foo() {
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/// }
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/// ```
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#[clippy::version = "1.78.0"]
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pub MIXED_ATTRIBUTES_STYLE,
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suspicious,
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"item has both inner and outer attributes"
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}
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declare_lint_pass!(Attributes => [
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ALLOW_ATTRIBUTES_WITHOUT_REASON,
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INLINE_ALWAYS,
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@ -849,11 +876,13 @@ impl_lint_pass!(EarlyAttributes => [
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MAYBE_MISUSED_CFG,
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DEPRECATED_CLIPPY_CFG_ATTR,
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UNNECESSARY_CLIPPY_CFG,
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MIXED_ATTRIBUTES_STYLE,
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]);
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impl EarlyLintPass for EarlyAttributes {
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fn check_item(&mut self, cx: &EarlyContext<'_>, item: &rustc_ast::Item) {
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check_empty_line_after_outer_attr(cx, item);
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check_mixed_attributes(cx, item);
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}
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fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &Attribute) {
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@ -867,6 +896,32 @@ impl EarlyLintPass for EarlyAttributes {
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extract_msrv_attr!(EarlyContext);
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}
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fn check_mixed_attributes(cx: &EarlyContext<'_>, item: &rustc_ast::Item) {
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let mut has_outer = false;
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let mut has_inner = false;
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for attr in &item.attrs {
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if attr.span.from_expansion() {
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continue;
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}
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match attr.style {
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AttrStyle::Inner => has_inner = true,
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AttrStyle::Outer => has_outer = true,
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}
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}
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if !has_outer || !has_inner {
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return;
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}
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let mut attrs_iter = item.attrs.iter().filter(|attr| !attr.span.from_expansion());
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let span = attrs_iter.next().unwrap().span;
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span_lint(
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cx,
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MIXED_ATTRIBUTES_STYLE,
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span.with_hi(attrs_iter.last().unwrap().span.hi()),
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"item has both inner and outer attributes",
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);
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}
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/// Check for empty lines after outer attributes.
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///
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/// Attributes and documentation comments are both considered outer attributes
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@ -58,6 +58,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
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crate::attrs::INLINE_ALWAYS_INFO,
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crate::attrs::MAYBE_MISUSED_CFG_INFO,
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crate::attrs::MISMATCHED_TARGET_OS_INFO,
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crate::attrs::MIXED_ATTRIBUTES_STYLE_INFO,
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crate::attrs::NON_MINIMAL_CFG_INFO,
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crate::attrs::SHOULD_PANIC_WITHOUT_EXPECT_INFO,
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crate::attrs::UNNECESSARY_CLIPPY_CFG_INFO,
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