2 use rustc_errors::Applicability;
3 use rustc_session::Session;
7 /// Deprecation status of attributes known by Clippy.
9 pub enum DeprecationStatus {
10 /// Attribute is deprecated
12 /// Attribute is deprecated and was replaced by the named attribute
13 Replaced(&'static str),
17 pub const BUILTIN_ATTRIBUTES: &[(&str, DeprecationStatus)] = &[
18 ("author", DeprecationStatus::None),
19 ("cognitive_complexity", DeprecationStatus::None),
21 "cyclomatic_complexity",
22 DeprecationStatus::Replaced("cognitive_complexity"),
24 ("dump", DeprecationStatus::None),
25 ("msrv", DeprecationStatus::None),
28 pub struct LimitStack {
32 impl Drop for LimitStack {
34 assert_eq!(self.stack.len(), 1);
40 pub fn new(limit: u64) -> Self {
41 Self { stack: vec![limit] }
43 pub fn limit(&self) -> u64 {
44 *self.stack.last().expect("there should always be a value in the stack")
46 pub fn push_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
47 let stack = &mut self.stack;
48 parse_attrs(sess, attrs, name, |val| stack.push(val));
50 pub fn pop_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
51 let stack = &mut self.stack;
52 parse_attrs(sess, attrs, name, |val| assert_eq!(stack.pop(), Some(val)));
58 attrs: &'a [ast::Attribute],
60 ) -> impl Iterator<Item = &'a ast::Attribute> {
61 attrs.iter().filter(move |attr| {
62 let attr = if let ast::AttrKind::Normal(ref attr, _) = attr.kind {
67 let attr_segments = &attr.path.segments;
68 if attr_segments.len() == 2 && attr_segments[0].ident.name == sym::clippy {
71 .find_map(|&(builtin_name, ref deprecation_status)| {
72 if attr_segments[1].ident.name.as_str() == builtin_name {
73 Some(deprecation_status)
80 sess.span_err(attr_segments[1].ident.span, "usage of unknown attribute");
83 |deprecation_status| {
85 sess.struct_span_err(attr_segments[1].ident.span, "usage of deprecated attribute");
86 match *deprecation_status {
87 DeprecationStatus::Deprecated => {
91 DeprecationStatus::Replaced(new_name) => {
93 attr_segments[1].ident.span,
96 Applicability::MachineApplicable,
101 DeprecationStatus::None => {
103 attr_segments[1].ident.name.as_str() == name
114 fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'static str, mut f: F) {
115 for attr in get_attr(sess, attrs, name) {
116 if let Some(ref value) = attr.value_str() {
117 if let Ok(value) = FromStr::from_str(&value.as_str()) {
120 sess.span_err(attr.span, "not a number");
123 sess.span_err(attr.span, "bad clippy attribute");
128 pub fn get_unique_inner_attr(sess: &Session, attrs: &[ast::Attribute], name: &'static str) -> Option<ast::Attribute> {
129 let mut unique_attr = None;
130 for attr in get_attr(sess, attrs, name) {
132 ast::AttrStyle::Inner if unique_attr.is_none() => unique_attr = Some(attr.clone()),
133 ast::AttrStyle::Inner => {
134 sess.struct_span_err(attr.span, &format!("`{}` is defined multiple times", name))
135 .span_note(unique_attr.as_ref().unwrap().span, "first definition found here")
138 ast::AttrStyle::Outer => {
139 sess.span_err(attr.span, &format!("`{}` cannot be an outer attribute", name));
146 /// Return true if the attributes contain any of `proc_macro`,
147 /// `proc_macro_derive` or `proc_macro_attribute`, false otherwise
148 pub fn is_proc_macro(sess: &Session, attrs: &[ast::Attribute]) -> bool {
149 attrs.iter().any(|attr| sess.is_proc_macro_attr(attr))