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Fix is_from_proc_macro attr

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Ruairidh Williamson 2024-10-25 15:14:02 +01:00
parent cefa31a524
commit 59ecf4d073
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5 changed files with 83 additions and 15 deletions
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26
clippy_utils/src/check_proc_macro.rs
View file

@ -63,8 +63,8 @@ fn span_matches_pat(sess: &Session, span: Span, start_pat: Pat, end_pat: Pat) ->
Pat::Num => start_str.as_bytes().first().map_or(false, u8::is_ascii_digit),
} && match end_pat {
Pat::Str(text) => end_str.ends_with(text),
Pat::MultiStr(texts) => texts.iter().any(|s| start_str.ends_with(s)),
Pat::OwnedMultiStr(texts) => texts.iter().any(|s| start_str.starts_with(s)),
Pat::MultiStr(texts) => texts.iter().any(|s| end_str.ends_with(s)),
Pat::OwnedMultiStr(texts) => texts.iter().any(|s| end_str.ends_with(s)),
Pat::Sym(sym) => end_str.ends_with(sym.as_str()),
Pat::Num => end_str.as_bytes().last().map_or(false, u8::is_ascii_hexdigit),
})
@ -333,26 +333,32 @@ fn attr_search_pat(attr: &Attribute) -> (Pat, Pat) {
match attr.kind {
AttrKind::Normal(..) => {
if let Some(ident) = attr.ident() {
// TODO: I feel like it's likely we can use `Cow` instead but this will require quite a bit of
// refactoring
// NOTE: This will likely have false positives, like `allow = 1`
(
Pat::OwnedMultiStr(vec![ident.to_string(), "#".to_owned()]),
Pat::Str(""),
)
let ident_string = ident.to_string();
if attr.style == AttrStyle::Outer {
(
Pat::OwnedMultiStr(vec!["#[".to_owned() + &ident_string, ident_string]),
Pat::Str(""),
)
} else {
(
Pat::OwnedMultiStr(vec!["#![".to_owned() + &ident_string, ident_string]),
Pat::Str(""),
)
}
} else {
(Pat::Str("#"), Pat::Str("]"))
}
},
AttrKind::DocComment(_kind @ CommentKind::Line, ..) => {
if matches!(attr.style, AttrStyle::Outer) {
if attr.style == AttrStyle::Outer {
(Pat::Str("///"), Pat::Str(""))
} else {
(Pat::Str("//!"), Pat::Str(""))
}
},
AttrKind::DocComment(_kind @ CommentKind::Block, ..) => {
if matches!(attr.style, AttrStyle::Outer) {
if attr.style == AttrStyle::Outer {
(Pat::Str("/**"), Pat::Str("*/"))
} else {
(Pat::Str("/*!"), Pat::Str("*/"))

7
tests/ui/allow_attributes.fixed
View file

@ -1,4 +1,5 @@
//@aux-build:proc_macros.rs
//@aux-build:proc_macro_derive.rs
#![allow(unused)]
#![warn(clippy::allow_attributes)]
#![no_main]
@ -65,3 +66,9 @@ fn deny_allow_attributes() -> Option<u8> {
allow?;
Some(42)
}
// Edge case where the generated tokens spans match on #[repr(transparent)] which tricks the proc
// macro check
#[repr(transparent)]
#[derive(proc_macro_derive::AllowLintSameSpan)] // This macro generates tokens with the same span as the whole struct and repr
struct IgnoreDerived;

7
tests/ui/allow_attributes.rs
View file

@ -1,4 +1,5 @@
//@aux-build:proc_macros.rs
//@aux-build:proc_macro_derive.rs
#![allow(unused)]
#![warn(clippy::allow_attributes)]
#![no_main]
@ -65,3 +66,9 @@ fn deny_allow_attributes() -> Option<u8> {
allow?;
Some(42)
}
// Edge case where the generated tokens spans match on #[repr(transparent)] which tricks the proc
// macro check
#[repr(transparent)]
#[derive(proc_macro_derive::AllowLintSameSpan)] // This macro generates tokens with the same span as the whole struct and repr
struct IgnoreDerived;

8
tests/ui/allow_attributes.stderr
View file

@ -1,5 +1,5 @@
error: #[allow] attribute found
--> tests/ui/allow_attributes.rs:12:3
--> tests/ui/allow_attributes.rs:13:3
|
LL | #[allow(dead_code)]
| ^^^^^ help: replace it with: `expect`
@ -8,19 +8,19 @@ LL | #[allow(dead_code)]
= help: to override `-D warnings` add `#[allow(clippy::allow_attributes)]`
error: #[allow] attribute found
--> tests/ui/allow_attributes.rs:21:30
--> tests/ui/allow_attributes.rs:22:30
|
LL | #[cfg_attr(panic = "unwind", allow(dead_code))]
| ^^^^^ help: replace it with: `expect`
error: #[allow] attribute found
--> tests/ui/allow_attributes.rs:52:7
--> tests/ui/allow_attributes.rs:53:7
|
LL | #[allow(unused)]
| ^^^^^ help: replace it with: `expect`
error: #[allow] attribute found
--> tests/ui/allow_attributes.rs:52:7
--> tests/ui/allow_attributes.rs:53:7
|
LL | #[allow(unused)]
| ^^^^^ help: replace it with: `expect`

50
tests/ui/auxiliary/proc_macro_derive.rs
View file

@ -1,4 +1,4 @@
#![feature(repr128, proc_macro_quote)]
#![feature(repr128, proc_macro_quote, proc_macro_span)]
#![allow(incomplete_features)]
#![allow(clippy::field_reassign_with_default)]
#![allow(clippy::eq_op)]
@ -182,3 +182,51 @@ pub fn non_canonical_clone_derive(_: TokenStream) -> TokenStream {
impl Copy for NonCanonicalClone {}
}
}
// Derive macro that generates the following but where all generated spans are set to the entire
// input span.
//
// ```
// #[allow(clippy::missing_const_for_fn)]
// fn check() {}
// ```
#[proc_macro_derive(AllowLintSameSpan)]
pub fn allow_lint_same_span_derive(input: TokenStream) -> TokenStream {
let mut iter = input.into_iter();
let first = iter.next().unwrap();
let last = iter.last().unwrap();
let span = first.span().join(last.span()).unwrap();
let span_help = |mut t: TokenTree| -> TokenTree {
t.set_span(span);
t
};
// Generate the TokenStream but setting all the spans to the entire input span
<TokenStream as FromIterator<TokenTree>>::from_iter([
span_help(Punct::new('#', Spacing::Alone).into()),
span_help(
Group::new(
Delimiter::Bracket,
<TokenStream as FromIterator<TokenTree>>::from_iter([
Ident::new("allow", span).into(),
span_help(
Group::new(
Delimiter::Parenthesis,
<TokenStream as FromIterator<TokenTree>>::from_iter([
Ident::new("clippy", span).into(),
span_help(Punct::new(':', Spacing::Joint).into()),
span_help(Punct::new(':', Spacing::Alone).into()),
Ident::new("missing_const_for_fn", span).into(),
]),
)
.into(),
),
]),
)
.into(),
),
Ident::new("fn", span).into(),
Ident::new("check", span).into(),
span_help(Group::new(Delimiter::Parenthesis, TokenStream::new()).into()),
span_help(Group::new(Delimiter::Brace, TokenStream::new()).into()),
])
}