use rustc_ast::Attribute;
use rustc_attr::parse_version;
use rustc_session::{RustcVersion, Session};
use rustc_span::{Symbol, sym};
use serde::Deserialize;
use std::fmt;
macro_rules! msrv_aliases {
($($major:literal,$minor:literal,$patch:literal {
$($name:ident),* $(,)?
})*) => {
$($(
pub const $name: RustcVersion = RustcVersion { major: $major, minor :$minor, patch: $patch };
)*)*
};
}
msrv_aliases! {
1,83,0 { CONST_EXTERN_FN }
1,83,0 { CONST_FLOAT_BITS_CONV }
1,82,0 { IS_NONE_OR }
1,81,0 { LINT_REASONS_STABILIZATION }
1,80,0 { BOX_INTO_ITER}
1,77,0 { C_STR_LITERALS }
1,76,0 { PTR_FROM_REF, OPTION_RESULT_INSPECT }
1,73,0 { MANUAL_DIV_CEIL }
1,71,0 { TUPLE_ARRAY_CONVERSIONS, BUILD_HASHER_HASH_ONE }
1,70,0 { OPTION_RESULT_IS_VARIANT_AND, BINARY_HEAP_RETAIN }
1,68,0 { PATH_MAIN_SEPARATOR_STR }
1,65,0 { LET_ELSE, POINTER_CAST_CONSTNESS }
1,63,0 { CLONE_INTO }
1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE, CONST_EXTERN_C_FN }
1,59,0 { THREAD_LOCAL_CONST_INIT }
1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY, CONST_RAW_PTR_DEREF }
1,56,0 { CONST_FN_UNION }
1,55,0 { SEEK_REWIND }
1,54,0 { INTO_KEYS }
1,53,0 { OR_PATTERNS, MANUAL_BITS, BTREE_MAP_RETAIN, BTREE_SET_RETAIN, ARRAY_INTO_ITERATOR }
1,52,0 { STR_SPLIT_ONCE, REM_EUCLID_CONST }
1,51,0 { BORROW_AS_PTR, SEEK_FROM_CURRENT, UNSIGNED_ABS }
1,50,0 { BOOL_THEN, CLAMP }
1,47,0 { TAU, IS_ASCII_DIGIT_CONST, ARRAY_IMPL_ANY_LEN, SATURATING_SUB_CONST }
1,46,0 { CONST_IF_MATCH }
1,45,0 { STR_STRIP_PREFIX }
1,43,0 { LOG2_10, LOG10_2, NUMERIC_ASSOCIATED_CONSTANTS }
1,42,0 { MATCHES_MACRO, SLICE_PATTERNS, PTR_SLICE_RAW_PARTS }
1,41,0 { RE_REBALANCING_COHERENCE, RESULT_MAP_OR_ELSE }
1,40,0 { MEM_TAKE, NON_EXHAUSTIVE, OPTION_AS_DEREF }
1,38,0 { POINTER_CAST, REM_EUCLID }
1,37,0 { TYPE_ALIAS_ENUM_VARIANTS }
1,36,0 { ITERATOR_COPIED }
1,35,0 { OPTION_COPIED, RANGE_CONTAINS }
1,34,0 { TRY_FROM }
1,33,0 { UNDERSCORE_IMPORTS }
1,30,0 { ITERATOR_FIND_MAP, TOOL_ATTRIBUTES }
1,29,0 { ITER_FLATTEN }
1,28,0 { FROM_BOOL }
1,27,0 { ITERATOR_TRY_FOLD }
1,26,0 { RANGE_INCLUSIVE, STRING_RETAIN }
1,24,0 { IS_ASCII_DIGIT }
1,18,0 { HASH_MAP_RETAIN, HASH_SET_RETAIN }
1,17,0 { FIELD_INIT_SHORTHAND, STATIC_IN_CONST, EXPECT_ERR }
1,16,0 { STR_REPEAT }
1,15,0 { MAYBE_BOUND_IN_WHERE }
}
#[derive(Debug, Clone)]
pub struct Msrv {
stack: Vec<RustcVersion>,
}
impl fmt::Display for Msrv {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if let Some(msrv) = self.current() {
write!(f, "{msrv}")
} else {
f.write_str("1.0.0")
}
}
}
impl<'de> Deserialize<'de> for Msrv {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let v = String::deserialize(deserializer)?;
parse_version(Symbol::intern(&v))
.map(|v| Msrv { stack: vec![v] })
.ok_or_else(|| serde::de::Error::custom("not a valid Rust version"))
}
}
impl Msrv {
pub fn empty() -> Msrv {
Msrv { stack: Vec::new() }
}
pub fn read_cargo(&mut self, sess: &Session) {
let cargo_msrv = std::env::var("CARGO_PKG_RUST_VERSION")
.ok()
.and_then(|v| parse_version(Symbol::intern(&v)));
match (self.current(), cargo_msrv) {
(None, Some(cargo_msrv)) => self.stack = vec![cargo_msrv],
(Some(clippy_msrv), Some(cargo_msrv)) => {
if clippy_msrv != cargo_msrv {
sess.dcx().warn(format!(
"the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
));
}
},
_ => {},
}
}
pub fn current(&self) -> Option<RustcVersion> {
self.stack.last().copied()
}
pub fn meets(&self, required: RustcVersion) -> bool {
self.current().map_or(true, |msrv| msrv >= required)
}
fn parse_attr(sess: &Session, attrs: &[Attribute]) -> Option<RustcVersion> {
let sym_msrv = Symbol::intern("msrv");
let mut msrv_attrs = attrs.iter().filter(|attr| attr.path_matches(&[sym::clippy, sym_msrv]));
if let Some(msrv_attr) = msrv_attrs.next() {
if let Some(duplicate) = msrv_attrs.last() {
sess.dcx()
.struct_span_err(duplicate.span, "`clippy::msrv` is defined multiple times")
.with_span_note(msrv_attr.span, "first definition found here")
.emit();
}
if let Some(msrv) = msrv_attr.value_str() {
if let Some(version) = parse_version(msrv) {
return Some(version);
}
sess.dcx()
.span_err(msrv_attr.span, format!("`{msrv}` is not a valid Rust version"));
} else {
sess.dcx().span_err(msrv_attr.span, "bad clippy attribute");
}
}
None
}
pub fn check_attributes(&mut self, sess: &Session, attrs: &[Attribute]) {
if let Some(version) = Self::parse_attr(sess, attrs) {
self.stack.push(version);
}
}
pub fn check_attributes_post(&mut self, sess: &Session, attrs: &[Attribute]) {
if Self::parse_attr(sess, attrs).is_some() {
self.stack.pop();
}
}
}