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Differ between inner and outer attributes

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flip1995 2018-09-18 11:35:53 +02:00 committed by flip1995
parent 7bd8c303d3
commit a770d8edd0
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1 changed files with 48 additions and 5 deletions
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53
clippy_lints/src/attrs.rs
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@ -172,12 +172,12 @@ declare_clippy_lint! {
/// **What it does:** Checks for `#[cfg_attr(rustfmt, rustfmt_skip)]` and suggests to replace it
/// with `#[rustfmt::skip]`.
///
/// **Why is this bad?** Since tool_attributes (rust-lang/rust#44690) are stable now, they should
/// be used instead of the old `cfg_attr(rustfmt)` attribute.
/// **Why is this bad?** Since tool_attributes ([rust-lang/rust#44690](https://github.com/rust-lang/rust/issues/44690))
/// are stable now, they should be used instead of the old `cfg_attr(rustfmt)` attributes.
///
/// **Known problems:** It currently only detects outer attributes. But since it does not really
/// makes sense to have `#![cfg_attr(rustfmt, rustfmt_skip)]` as an inner attribute, this should be
/// ok.
/// **Known problems:** This lint doesn't detect crate level inner attributes, because they get
/// processed before the PreExpansionPass lints get executed. See
/// [#3123](https://github.com/rust-lang-nursery/rust-clippy/pull/3123#issuecomment-422321765)
///
/// **Example:**
///
@ -495,3 +495,46 @@ fn is_present_in_source(cx: &LateContext<'_, '_>, span: Span) -> bool {
}
true
}
#[derive(Copy, Clone)]
pub struct CfgAttrPass;
impl LintPass for CfgAttrPass {
fn get_lints(&self) -> LintArray {
lint_array!(
DEPRECATED_CFG_ATTR,
)
}
}
impl EarlyLintPass for CfgAttrPass {
fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &Attribute) {
if_chain! {
// check cfg_attr
if attr.name() == "cfg_attr";
if let Some(ref items) = attr.meta_item_list();
if items.len() == 2;
// check for `rustfmt`
if let Some(feature_item) = items[0].meta_item();
if feature_item.name() == "rustfmt";
// check for `rustfmt_skip`
if let Some(skip_item) = &items[1].meta_item();
if skip_item.name() == "rustfmt_skip";
then {
let attr_style = match attr.style {
AttrStyle::Outer => "#[",
AttrStyle::Inner => "#![",
};
span_lint_and_sugg(
cx,
DEPRECATED_CFG_ATTR,
attr.span,
"`cfg_attr` is deprecated for rustfmt and got replaced by tool_attributes",
"use",
format!("{}rustfmt::skip]", attr_style),
);
}
}
}
}