Remove old define_violation! (in favor of #[violation]) (#3310)

crates/ruff/src/rules/flake8_pyi/rules/type_comment_in_stub.rs

@@ -3,33 +3,33 @@ use regex::Regex;
 use rustpython_parser::lexer::LexResult;
 use rustpython_parser::Tok;
 
-use ruff_macros::{define_violation, derive_message_formats};
+use ruff_macros::{derive_message_formats, violation};
 
 use crate::registry::Diagnostic;
 use crate::violation::Violation;
 use crate::Range;
 
-define_violation!(
-    /// ## What it does
-    /// Checks for the use of type comments (e.g., `x = 1  # type: int`) in stub
-    /// files.
-    ///
-    /// ## Why is this bad?
-    /// Stub (`.pyi`) files should use type annotations directly, rather
-    /// than type comments, even if they're intended to support Python 2, since
-    /// stub files are not executed at runtime. The one exception is `# type: ignore`.
-    ///
-    /// ## Example
-    /// ```python
-    /// x = 1 # type: int
-    /// ```
-    ///
-    /// Use instead:
-    /// ```python
-    /// x: int = 1
-    /// ```
-    pub struct TypeCommentInStub;
-);
+/// ## What it does
+/// Checks for the use of type comments (e.g., `x = 1  # type: int`) in stub
+/// files.
+///
+/// ## Why is this bad?
+/// Stub (`.pyi`) files should use type annotations directly, rather
+/// than type comments, even if they're intended to support Python 2, since
+/// stub files are not executed at runtime. The one exception is `# type: ignore`.
+///
+/// ## Example
+/// ```python
+/// x = 1 # type: int
+/// ```
+///
+/// Use instead:
+/// ```python
+/// x: int = 1
+/// ```
+#[violation]
+pub struct TypeCommentInStub;
+
 impl Violation for TypeCommentInStub {
     #[derive_message_formats]
     fn message(&self) -> String {

crates/ruff/src/rules/pycodestyle/rules/missing_whitespace.rs

@@ -3,7 +3,7 @@
 use rustpython_parser::ast::Location;
 use rustpython_parser::Tok;
 
-use ruff_macros::{define_violation, derive_message_formats};
+use ruff_macros::{derive_message_formats, violation};
 
 use crate::ast::types::Range;
 use crate::fix::Fix;
@@ -13,11 +13,11 @@ use crate::rules::pycodestyle::helpers::{is_keyword_token, is_singleton_token};
 use crate::violation::AlwaysAutofixableViolation;
 use crate::violation::Violation;
 
-define_violation!(
-    pub struct MissingWhitespace {
-        pub token: String,
-    }
-);
+#[violation]
+pub struct MissingWhitespace {
+    pub token: String,
+}
+
 impl AlwaysAutofixableViolation for MissingWhitespace {
     #[derive_message_formats]
     fn message(&self) -> String {

crates/ruff/src/rules/pycodestyle/rules/missing_whitespace_around_operator.rs

@@ -3,7 +3,7 @@
 use rustpython_parser::ast::Location;
 use rustpython_parser::Tok;
 
-use ruff_macros::{define_violation, derive_message_formats};
+use ruff_macros::{derive_message_formats, violation};
 
 use crate::registry::DiagnosticKind;
 use crate::rules::pycodestyle::helpers::{
@@ -13,9 +13,9 @@ use crate::rules::pycodestyle::helpers::{
 use crate::violation::Violation;
 
 // E225
-define_violation!(
-    pub struct MissingWhitespaceAroundOperator;
-);
+#[violation]
+pub struct MissingWhitespaceAroundOperator;
+
 impl Violation for MissingWhitespaceAroundOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
@@ -24,9 +24,9 @@ impl Violation for MissingWhitespaceAroundOperator {
 }
 
 // E226
-define_violation!(
-    pub struct MissingWhitespaceAroundArithmeticOperator;
-);
+#[violation]
+pub struct MissingWhitespaceAroundArithmeticOperator;
+
 impl Violation for MissingWhitespaceAroundArithmeticOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
@@ -35,9 +35,9 @@ impl Violation for MissingWhitespaceAroundArithmeticOperator {
 }
 
 // E227
-define_violation!(
-    pub struct MissingWhitespaceAroundBitwiseOrShiftOperator;
-);
+#[violation]
+pub struct MissingWhitespaceAroundBitwiseOrShiftOperator;
+
 impl Violation for MissingWhitespaceAroundBitwiseOrShiftOperator {
     #[derive_message_formats]
     fn message(&self) -> String {
@@ -46,9 +46,9 @@ impl Violation for MissingWhitespaceAroundBitwiseOrShiftOperator {
 }
 
 // E228
-define_violation!(
-    pub struct MissingWhitespaceAroundModuloOperator;
-);
+#[violation]
+pub struct MissingWhitespaceAroundModuloOperator;
+
 impl Violation for MissingWhitespaceAroundModuloOperator {
     #[derive_message_formats]
     fn message(&self) -> String {

crates/ruff/src/rules/pycodestyle/rules/whitespace_before_parameters.rs

@@ -3,7 +3,7 @@
 use rustpython_parser::ast::Location;
 use rustpython_parser::Tok;
 
-use ruff_macros::{define_violation, derive_message_formats};
+use ruff_macros::{derive_message_formats, violation};
 
 use crate::ast::types::Range;
 use crate::fix::Fix;
@@ -11,11 +11,10 @@ use crate::registry::Diagnostic;
 use crate::rules::pycodestyle::helpers::{is_keyword_token, is_op_token, is_soft_keyword_token};
 use crate::violation::AlwaysAutofixableViolation;
 
-define_violation!(
-    pub struct WhitespaceBeforeParameters {
-        pub bracket: String,
-    }
-);
+#[violation]
+pub struct WhitespaceBeforeParameters {
+    pub bracket: String,
+}
 
 impl AlwaysAutofixableViolation for WhitespaceBeforeParameters {
     #[derive_message_formats]

crates/ruff/src/rules/pyupgrade/rules/use_pep604_isinstance.rs

@@ -1,7 +1,9 @@
-use ruff_macros::{define_violation, derive_message_formats};
+use std::fmt;
+
 use rustpython_parser::ast::{Expr, ExprKind, Location, Operator};
 use serde::{Deserialize, Serialize};
-use std::fmt;
+
+use ruff_macros::{derive_message_formats, violation};
 
 use crate::ast::helpers::unparse_expr;
 use crate::ast::types::Range;
@@ -35,12 +37,12 @@ impl CallKind {
     }
 }
 
-define_violation!(
-    // TODO: document referencing [PEP 604]: https://peps.python.org/pep-0604/
-    pub struct IsinstanceWithTuple {
-        pub kind: CallKind,
-    }
-);
+// TODO: document referencing [PEP 604]: https://peps.python.org/pep-0604/
+#[violation]
+pub struct IsinstanceWithTuple {
+    pub kind: CallKind,
+}
+
 impl AlwaysAutofixableViolation for IsinstanceWithTuple {
     #[derive_message_formats]
     fn message(&self) -> String {

crates/ruff_macros/src/lib.rs

@@ -6,12 +6,12 @@ use syn::{parse_macro_input, DeriveInput, ItemFn, ItemStruct};
 
 mod cache_key;
 mod config;
-mod define_violation;
 mod derive_message_formats;
 mod map_codes;
 mod register_rules;
 mod rule_code_prefix;
 mod rule_namespace;
+mod violation;
 
 #[proc_macro_derive(ConfigurationOptions, attributes(option, doc, option_group))]
 pub fn derive_config(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
@@ -38,19 +38,12 @@ pub fn register_rules(item: proc_macro::TokenStream) -> proc_macro::TokenStream
     register_rules::register_rules(&mapping).into()
 }
 
-#[proc_macro]
-pub fn define_violation(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
-    let cloned = item.clone();
-    let meta = parse_macro_input!(cloned as define_violation::LintMeta);
-    define_violation::define_violation(&item.into(), meta).into()
-}
-
 /// Adds an `explanation()` method from the doc comment and
 /// `#[derive(Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]`
 #[proc_macro_attribute]
 pub fn violation(_attr: TokenStream, item: TokenStream) -> TokenStream {
     let violation = parse_macro_input!(item as ItemStruct);
-    define_violation::violation(&violation)
+    violation::violation(&violation)
         .unwrap_or_else(syn::Error::into_compile_error)
         .into()
 }

crates/ruff_macros/src/violation.rs

@@ -1,7 +1,6 @@
 use proc_macro2::TokenStream;
 use quote::quote;
-use syn::parse::{Parse, ParseStream};
-use syn::{Attribute, Error, Ident, ItemStruct, Lit, LitStr, Meta, Result, Token};
+use syn::{Attribute, Error, ItemStruct, Lit, LitStr, Meta, Result};
 
 fn parse_attr<const LEN: usize>(path: [&'static str; LEN], attr: &Attribute) -> Option<LitStr> {
     if let Meta::NameValue(name_value) = attr.parse_meta().ok()? {
@@ -21,59 +20,6 @@ fn parse_attr<const LEN: usize>(path: [&'static str; LEN], attr: &Attribute) ->
     None
 }
 
-pub struct LintMeta {
-    explanation: String,
-    name: Ident,
-}
-
-impl Parse for LintMeta {
-    fn parse(input: ParseStream) -> Result<Self> {
-        let attrs = input.call(Attribute::parse_outer)?;
-
-        let mut explanation = String::new();
-        for attr in &attrs {
-            if let Some(lit) = parse_attr(["doc"], attr) {
-                let value = lit.value();
-                let line = value.strip_prefix(' ').unwrap_or(&value);
-                explanation.push_str(line);
-                explanation.push('\n');
-            } else {
-                return Err(Error::new_spanned(attr, "unexpected attribute"));
-            }
-        }
-
-        input.parse::<Token![pub]>()?;
-        input.parse::<Token![struct]>()?;
-        let name = input.parse()?;
-
-        // Ignore the rest of the input.
-        input.parse::<TokenStream>()?;
-
-        Ok(Self { explanation, name })
-    }
-}
-
-pub fn define_violation(input: &TokenStream, meta: LintMeta) -> TokenStream {
-    let LintMeta { explanation, name } = meta;
-    if explanation.is_empty() {
-        quote! {
-            #[derive(Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
-            #input
-        }
-    } else {
-        quote! {
-            #[derive(Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
-            #input
-
-            impl #name {
-                pub fn explanation() -> Option<&'static str> {
-                    Some(#explanation)
-                }
-            }
-        }
-    }
-}
-
 /// Collect all doc comment attributes into a string
 fn get_docs(attrs: &[Attribute]) -> Result<String> {
     let mut explanation = String::new();