mod clone_on_copy;
mod clone_on_ref_ptr;
mod cloned_instead_of_copied;
+mod err_expect;
mod expect_fun_call;
mod expect_used;
mod extend_with_drain;
mod inefficient_to_string;
mod inspect_for_each;
mod into_iter_on_ref;
+mod is_digit_ascii_radix;
mod iter_cloned_collect;
mod iter_count;
mod iter_next_slice;
mod map_flatten;
mod map_identity;
mod map_unwrap_or;
+mod needless_option_as_deref;
mod ok_expect;
mod option_as_ref_deref;
mod option_map_or_none;
"using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result"
}
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.err().expect()` calls on the `Result` type.
+ ///
+ /// ### Why is this bad?
+ /// `.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
+ ///
+ /// ### Example
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.err().expect("Testing err().expect()");
+ /// ```
+ /// Use instead:
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.expect_err("Testing expect_err");
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub ERR_EXPECT,
+ style,
+ r#"using `.err().expect("")` when `.expect_err("")` can be used"#
+}
+
declare_clippy_lint! {
/// ### What it does
/// Checks for usages of `_.unwrap_or_else(Default::default)` on `Option` and
/// Checks for use of `.collect::<Vec<String>>().join("")` on iterators.
///
/// ### Why is this bad?
- /// `.collect::<String>()` is more concise and usually more performant
+ /// `.collect::<String>()` is more concise and might be more performant
///
/// ### Example
/// ```rust
/// println!("{}", output);
/// ```
/// ### Known problems
- /// While `.collect::<String>()` is more performant in most cases, there are cases where
+ /// While `.collect::<String>()` is sometimes more performant, there are cases where
/// using `.collect::<String>()` over `.collect::<Vec<String>>().join("")`
/// will prevent loop unrolling and will result in a negative performance impact.
+ ///
+ /// Additionlly, differences have been observed between aarch64 and x86_64 assembly output,
+ /// with aarch64 tending to producing faster assembly in more cases when using `.collect::<String>()`
#[clippy::version = "1.61.0"]
pub UNNECESSARY_JOIN,
pedantic,
"using `.collect::<Vec<String>>().join(\"\")` on an iterator"
}
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for no-op uses of `Option::{as_deref, as_deref_mut}`,
+ /// for example, `Option<&T>::as_deref()` returns the same type.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code and improving readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a.as_deref(); // goes from Option<&i32> to Option<&i32>
+ /// ```
+ /// Could be written as:
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a;
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub NEEDLESS_OPTION_AS_DEREF,
+ complexity,
+ "no-op use of `deref` or `deref_mut` method to `Option`."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds usages of [`char::is_digit`]
+ /// (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) that
+ /// can be replaced with [`is_ascii_digit`]
+ /// (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_digit) or
+ /// [`is_ascii_hexdigit`]
+ /// (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_hexdigit).
+ ///
+ /// ### Why is this bad?
+ /// `is_digit(..)` is slower and requires specifying the radix.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_digit(10);
+ /// c.is_digit(16);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_ascii_digit();
+ /// c.is_ascii_hexdigit();
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub IS_DIGIT_ASCII_RADIX,
+ style,
+ "use of `char::is_digit(..)` with literal radix of 10 or 16"
+}
+
pub struct Methods {
avoid_breaking_exported_api: bool,
msrv: Option<RustcVersion>,
NEEDLESS_SPLITN,
UNNECESSARY_TO_OWNED,
UNNECESSARY_JOIN,
+ ERR_EXPECT,
+ NEEDLESS_OPTION_AS_DEREF,
+ IS_DIGIT_ASCII_RADIX,
]);
/// Extracts a method call name, args, and `Span` of the method name.
unnecessary_lazy_eval::check(cx, expr, recv, arg, "and");
}
},
+ ("as_deref" | "as_deref_mut", []) => {
+ needless_option_as_deref::check(cx, expr, recv, name);
+ },
("as_mut", []) => useless_asref::check(cx, expr, "as_mut", recv),
("as_ref", []) => useless_asref::check(cx, expr, "as_ref", recv),
("assume_init", []) => uninit_assumed_init::check(cx, expr, recv),
},
("expect", [_]) => match method_call(recv) {
Some(("ok", [recv], _)) => ok_expect::check(cx, expr, recv),
+ Some(("err", [recv], err_span)) => err_expect::check(cx, expr, recv, msrv, span, err_span),
_ => expect_used::check(cx, expr, recv),
},
("extend", [arg]) => {
},
("get_or_insert_with", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "get_or_insert"),
("is_file", []) => filetype_is_file::check(cx, expr, recv),
+ ("is_digit", [radix]) => is_digit_ascii_radix::check(cx, expr, recv, radix, msrv),
("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
("join", [join_arg]) => {
}
}
},
- ("map", [m_arg]) => {
+ (name @ ("map" | "map_err"), [m_arg]) => {
if let Some((name, [recv2, args @ ..], span2)) = method_call(recv) {
match (name, args) {
("as_mut", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, true, msrv),
_ => {},
}
}
- map_identity::check(cx, expr, recv, m_arg, span);
+ map_identity::check(cx, expr, recv, m_arg, name, span);
},
("map_or", [def, map]) => option_map_or_none::check(cx, expr, recv, def, map),
(name @ "next", args @ []) => {
("splitn" | "rsplitn", [count_arg, pat_arg]) => {
if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
suspicious_splitn::check(cx, name, expr, recv, count);
- if count == 2 && meets_msrv(msrv, &msrvs::STR_SPLIT_ONCE) {
- str_splitn::check_manual_split_once(cx, name, expr, recv, pat_arg);
- }
- if count >= 2 {
- str_splitn::check_needless_splitn(cx, name, expr, recv, pat_arg, count);
- }
+ str_splitn::check(cx, name, expr, recv, pat_arg, count, msrv);
}
},
("splitn_mut" | "rsplitn_mut", [count_arg, _]) => {
projects / rust.git / blobdiff