2019-08-18 21:18:05 -05:00
|
|
|
use crate::utils::{
|
2020-01-26 19:56:22 -06:00
|
|
|
constants, snippet_opt, snippet_with_applicability, span_lint, span_lint_and_help, span_lint_and_sugg,
|
2019-09-25 11:30:27 -05:00
|
|
|
span_lint_and_then,
|
2019-08-18 21:18:05 -05:00
|
|
|
};
|
2018-11-27 14:14:15 -06:00
|
|
|
use if_chain::if_chain;
|
2020-02-29 21:23:33 -06:00
|
|
|
use rustc_ast::ast::{
|
2020-03-08 04:00:23 -05:00
|
|
|
BindingMode, Block, Expr, ExprKind, GenericParamKind, Generics, Lit, LitFloatType, LitIntType, LitKind, Mutability,
|
|
|
|
NodeId, Pat, PatKind, StmtKind, UnOp,
|
2020-02-29 21:23:33 -06:00
|
|
|
};
|
|
|
|
use rustc_ast::visit::{walk_expr, FnKind, Visitor};
|
2018-12-29 09:04:45 -06:00
|
|
|
use rustc_data_structures::fx::FxHashMap;
|
|
|
|
use rustc_errors::Applicability;
|
2020-01-12 00:08:41 -06:00
|
|
|
use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
|
2020-03-30 04:02:14 -05:00
|
|
|
use rustc_middle::lint::in_external_macro;
|
2020-01-11 05:37:08 -06:00
|
|
|
use rustc_session::{declare_lint_pass, declare_tool_lint};
|
2020-01-04 04:00:00 -06:00
|
|
|
use rustc_span::source_map::Span;
|
2016-08-06 02:55:04 -05:00
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Checks for structure field patterns bound to wildcards.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** Using `..` instead is shorter and leaves the focus on
|
|
|
|
/// the fields that are actually bound.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
2019-03-05 16:23:50 -06:00
|
|
|
/// ```ignore
|
2019-03-05 10:50:33 -06:00
|
|
|
/// let { a: _, b: ref b, c: _ } = ..
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub UNNEEDED_FIELD_PATTERN,
|
2020-02-19 17:32:59 -06:00
|
|
|
restriction,
|
2016-08-06 03:18:36 -05:00
|
|
|
"struct fields bound to a wildcard instead of using `..`"
|
2016-02-05 17:13:29 -06:00
|
|
|
}
|
2015-12-05 20:21:34 -06:00
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Checks for function arguments having the similar names
|
|
|
|
/// differing by an underscore.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It affects code readability.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
|
|
|
/// fn foo(a: i32, _a: i32) {}
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub DUPLICATE_UNDERSCORE_ARGUMENT,
|
2018-03-28 08:24:26 -05:00
|
|
|
style,
|
2016-08-06 03:18:36 -05:00
|
|
|
"function arguments having names which only differ by an underscore"
|
2016-02-05 17:13:29 -06:00
|
|
|
}
|
2016-01-03 07:00:42 -06:00
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Detects closures called in the same expression where they
|
|
|
|
/// are defined.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It is unnecessarily adding to the expression's
|
|
|
|
/// complexity.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
2019-08-02 01:13:54 -05:00
|
|
|
/// ```rust,ignore
|
2019-03-05 10:50:33 -06:00
|
|
|
/// (|| 42)()
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub REDUNDANT_CLOSURE_CALL,
|
2018-03-29 06:41:53 -05:00
|
|
|
complexity,
|
2016-08-06 03:18:36 -05:00
|
|
|
"throwaway closures called in the expression they are defined"
|
2016-03-03 13:14:49 -06:00
|
|
|
}
|
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Detects expressions of the form `--x`.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It can mislead C/C++ programmers to think `x` was
|
|
|
|
/// decremented.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
2019-03-05 16:23:50 -06:00
|
|
|
/// let mut x = 3;
|
2019-03-05 10:50:33 -06:00
|
|
|
/// --x;
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub DOUBLE_NEG,
|
2018-03-28 08:24:26 -05:00
|
|
|
style,
|
2016-08-06 03:18:36 -05:00
|
|
|
"`--x`, which is a double negation of `x` and not a pre-decrement as in C/C++"
|
2016-06-29 18:00:25 -05:00
|
|
|
}
|
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Warns on hexadecimal literals with mixed-case letter
|
|
|
|
/// digits.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It looks confusing.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
|
|
|
/// let y = 0x1a9BAcD;
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub MIXED_CASE_HEX_LITERALS,
|
2018-03-28 08:24:26 -05:00
|
|
|
style,
|
2016-08-06 03:18:36 -05:00
|
|
|
"hex literals whose letter digits are not consistently upper- or lowercased"
|
2016-08-05 11:30:07 -05:00
|
|
|
}
|
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Warns if literal suffixes are not separated by an
|
|
|
|
/// underscore.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It is much less readable.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
|
|
|
/// let y = 123832i32;
|
|
|
|
/// ```
|
2016-08-06 03:18:36 -05:00
|
|
|
pub UNSEPARATED_LITERAL_SUFFIX,
|
2018-03-28 08:24:26 -05:00
|
|
|
pedantic,
|
2016-08-06 03:18:36 -05:00
|
|
|
"literals whose suffix is not separated by an underscore"
|
2016-08-05 11:50:02 -05:00
|
|
|
}
|
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Warns if an integral constant literal starts with `0`.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** In some languages (including the infamous C language
|
|
|
|
/// and most of its
|
|
|
|
/// family), this marks an octal constant. In Rust however, this is a decimal
|
|
|
|
/// constant. This could
|
|
|
|
/// be confusing for both the writer and a reader of the constant.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
///
|
|
|
|
/// In Rust:
|
|
|
|
/// ```rust
|
|
|
|
/// fn main() {
|
|
|
|
/// let a = 0123;
|
|
|
|
/// println!("{}", a);
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
///
|
|
|
|
/// prints `123`, while in C:
|
|
|
|
///
|
|
|
|
/// ```c
|
|
|
|
/// #include <stdio.h>
|
|
|
|
///
|
|
|
|
/// int main() {
|
|
|
|
/// int a = 0123;
|
|
|
|
/// printf("%d\n", a);
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
///
|
|
|
|
/// prints `83` (as `83 == 0o123` while `123 == 0o173`).
|
2016-08-20 11:11:15 -05:00
|
|
|
pub ZERO_PREFIXED_LITERAL,
|
2018-03-28 08:24:26 -05:00
|
|
|
complexity,
|
2016-08-20 11:11:15 -05:00
|
|
|
"integer literals starting with `0`"
|
|
|
|
}
|
|
|
|
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 10:50:33 -06:00
|
|
|
/// **What it does:** Warns if a generic shadows a built-in type.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** This gives surprising type errors.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
///
|
2019-03-05 16:23:50 -06:00
|
|
|
/// ```ignore
|
2019-03-05 10:50:33 -06:00
|
|
|
/// impl<u32> Foo<u32> {
|
|
|
|
/// fn impl_func(&self) -> u32 {
|
|
|
|
/// 42
|
|
|
|
/// }
|
|
|
|
/// }
|
|
|
|
/// ```
|
2016-08-27 18:52:01 -05:00
|
|
|
pub BUILTIN_TYPE_SHADOW,
|
2018-03-28 08:24:26 -05:00
|
|
|
style,
|
2016-08-27 18:52:01 -05:00
|
|
|
"shadowing a builtin type"
|
|
|
|
}
|
|
|
|
|
2019-09-02 14:49:14 -05:00
|
|
|
declare_clippy_lint! {
|
|
|
|
/// **What it does:** Checks for patterns in the form `name @ _`.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It's almost always more readable to just use direct
|
|
|
|
/// bindings.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
|
|
|
/// # let v = Some("abc");
|
|
|
|
///
|
|
|
|
/// match v {
|
|
|
|
/// Some(x) => (),
|
|
|
|
/// y @ _ => (), // easier written as `y`,
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
pub REDUNDANT_PATTERN,
|
|
|
|
style,
|
|
|
|
"using `name @ _` in a pattern"
|
|
|
|
}
|
|
|
|
|
2019-09-12 01:25:05 -05:00
|
|
|
declare_clippy_lint! {
|
|
|
|
/// **What it does:** Checks for tuple patterns with a wildcard
|
2019-09-13 01:20:27 -05:00
|
|
|
/// pattern (`_`) is next to a rest pattern (`..`).
|
2019-09-12 01:25:05 -05:00
|
|
|
///
|
2019-09-17 23:48:47 -05:00
|
|
|
/// _NOTE_: While `_, ..` means there is at least one element left, `..`
|
|
|
|
/// means there are 0 or more elements left. This can make a difference
|
|
|
|
/// when refactoring, but shouldn't result in errors in the refactored code,
|
|
|
|
/// since the wildcard pattern isn't used anyway.
|
2019-09-12 01:25:05 -05:00
|
|
|
/// **Why is this bad?** The wildcard pattern is unneeded as the rest pattern
|
|
|
|
/// can match that element as well.
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
|
|
|
/// ```rust
|
|
|
|
/// # struct TupleStruct(u32, u32, u32);
|
|
|
|
/// # let t = TupleStruct(1, 2, 3);
|
|
|
|
///
|
|
|
|
/// match t {
|
|
|
|
/// TupleStruct(0, .., _) => (),
|
|
|
|
/// _ => (),
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
/// can be written as
|
|
|
|
/// ```rust
|
|
|
|
/// # struct TupleStruct(u32, u32, u32);
|
|
|
|
/// # let t = TupleStruct(1, 2, 3);
|
|
|
|
///
|
|
|
|
/// match t {
|
|
|
|
/// TupleStruct(0, ..) => (),
|
|
|
|
/// _ => (),
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
pub UNNEEDED_WILDCARD_PATTERN,
|
|
|
|
complexity,
|
2019-09-13 01:20:27 -05:00
|
|
|
"tuple patterns with a wildcard pattern (`_`) is next to a rest pattern (`..`)"
|
2019-09-12 01:25:05 -05:00
|
|
|
}
|
|
|
|
|
2019-04-08 15:43:55 -05:00
|
|
|
declare_lint_pass!(MiscEarlyLints => [
|
|
|
|
UNNEEDED_FIELD_PATTERN,
|
|
|
|
DUPLICATE_UNDERSCORE_ARGUMENT,
|
|
|
|
REDUNDANT_CLOSURE_CALL,
|
|
|
|
DOUBLE_NEG,
|
|
|
|
MIXED_CASE_HEX_LITERALS,
|
|
|
|
UNSEPARATED_LITERAL_SUFFIX,
|
|
|
|
ZERO_PREFIXED_LITERAL,
|
2019-09-02 14:49:14 -05:00
|
|
|
BUILTIN_TYPE_SHADOW,
|
2019-09-12 01:25:05 -05:00
|
|
|
REDUNDANT_PATTERN,
|
|
|
|
UNNEEDED_WILDCARD_PATTERN,
|
2019-04-08 15:43:55 -05:00
|
|
|
]);
|
2015-12-05 20:21:34 -06:00
|
|
|
|
2019-01-30 19:15:29 -06:00
|
|
|
// Used to find `return` statements or equivalents e.g., `?`
|
2018-11-14 00:01:39 -06:00
|
|
|
struct ReturnVisitor {
|
|
|
|
found_return: bool,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ReturnVisitor {
|
2019-09-18 01:37:41 -05:00
|
|
|
#[must_use]
|
2018-11-14 00:43:35 -06:00
|
|
|
fn new() -> Self {
|
2018-11-27 14:14:15 -06:00
|
|
|
Self { found_return: false }
|
2018-11-14 00:01:39 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<'ast> Visitor<'ast> for ReturnVisitor {
|
|
|
|
fn visit_expr(&mut self, ex: &'ast Expr) {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let ExprKind::Ret(_) = ex.kind {
|
2018-11-14 00:01:39 -06:00
|
|
|
self.found_return = true;
|
2019-09-27 10:16:06 -05:00
|
|
|
} else if let ExprKind::Try(_) = ex.kind {
|
2018-11-14 00:01:39 -06:00
|
|
|
self.found_return = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
walk_expr(self, ex)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-04-08 15:43:55 -05:00
|
|
|
impl EarlyLintPass for MiscEarlyLints {
|
2018-07-23 06:01:12 -05:00
|
|
|
fn check_generics(&mut self, cx: &EarlyContext<'_>, gen: &Generics) {
|
2017-12-21 22:42:47 -06:00
|
|
|
for param in &gen.params {
|
2018-06-24 08:32:40 -05:00
|
|
|
if let GenericParamKind::Type { .. } = param.kind {
|
2018-06-28 08:46:58 -05:00
|
|
|
let name = param.ident.as_str();
|
2017-12-21 22:42:47 -06:00
|
|
|
if constants::BUILTIN_TYPES.contains(&&*name) {
|
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
BUILTIN_TYPE_SHADOW,
|
2018-06-24 08:32:40 -05:00
|
|
|
param.ident.span,
|
2017-12-21 22:42:47 -06:00
|
|
|
&format!("This generic shadows the built-in type `{}`", name),
|
|
|
|
);
|
|
|
|
}
|
2016-08-27 18:52:01 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-04-23 10:25:45 -05:00
|
|
|
fn check_pat(&mut self, cx: &EarlyContext<'_>, pat: &Pat) {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Struct(ref npat, ref pfields, _) = pat.kind {
|
2015-12-05 20:21:34 -06:00
|
|
|
let mut wilds = 0;
|
2018-11-27 14:14:15 -06:00
|
|
|
let type_name = npat
|
|
|
|
.segments
|
2017-08-09 02:30:56 -05:00
|
|
|
.last()
|
|
|
|
.expect("A path must have at least one segment")
|
2018-04-07 00:22:23 -05:00
|
|
|
.ident
|
2017-08-09 02:30:56 -05:00
|
|
|
.name;
|
2015-12-05 20:21:34 -06:00
|
|
|
|
|
|
|
for field in pfields {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Wild = field.pat.kind {
|
2015-12-05 20:21:34 -06:00
|
|
|
wilds += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if !pfields.is_empty() && wilds == pfields.len() {
|
2020-01-26 19:56:22 -06:00
|
|
|
span_lint_and_help(
|
2017-08-09 02:30:56 -05:00
|
|
|
cx,
|
|
|
|
UNNEEDED_FIELD_PATTERN,
|
|
|
|
pat.span,
|
|
|
|
"All the struct fields are matched to a wildcard pattern, consider using `..`.",
|
|
|
|
&format!("Try with `{} {{ .. }}` instead", type_name),
|
|
|
|
);
|
2015-12-05 20:21:34 -06:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
if wilds > 0 {
|
|
|
|
for field in pfields {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Wild = field.pat.kind {
|
2016-01-01 22:52:13 -06:00
|
|
|
wilds -= 1;
|
|
|
|
if wilds > 0 {
|
2017-08-09 02:30:56 -05:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
UNNEEDED_FIELD_PATTERN,
|
|
|
|
field.span,
|
|
|
|
"You matched a field with a wildcard pattern. Consider using `..` instead",
|
|
|
|
);
|
2016-01-01 22:52:13 -06:00
|
|
|
} else {
|
2020-03-07 19:50:33 -06:00
|
|
|
let mut normal = vec![];
|
|
|
|
|
|
|
|
for field in pfields {
|
|
|
|
match field.pat.kind {
|
|
|
|
PatKind::Wild => {},
|
|
|
|
_ => {
|
|
|
|
if let Ok(n) = cx.sess().source_map().span_to_snippet(field.span) {
|
|
|
|
normal.push(n);
|
|
|
|
}
|
|
|
|
},
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-01-26 19:56:22 -06:00
|
|
|
span_lint_and_help(
|
2017-08-09 02:30:56 -05:00
|
|
|
cx,
|
|
|
|
UNNEEDED_FIELD_PATTERN,
|
|
|
|
field.span,
|
|
|
|
"You matched a field with a wildcard pattern. Consider using `..` \
|
2017-09-05 04:33:04 -05:00
|
|
|
instead",
|
2017-08-09 02:30:56 -05:00
|
|
|
&format!("Try with `{} {{ {}, .. }}`", type_name, normal[..].join(", ")),
|
|
|
|
);
|
2016-01-01 22:52:13 -06:00
|
|
|
}
|
2015-12-05 20:21:34 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2019-09-02 14:49:14 -05:00
|
|
|
|
2020-03-08 04:00:23 -05:00
|
|
|
if let PatKind::Ident(left, ident, Some(ref right)) = pat.kind {
|
|
|
|
let left_binding = match left {
|
|
|
|
BindingMode::ByRef(Mutability::Mut) => "ref mut ",
|
|
|
|
BindingMode::ByRef(Mutability::Not) => "ref ",
|
|
|
|
_ => "",
|
|
|
|
};
|
|
|
|
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Wild = right.kind {
|
2019-09-04 10:50:22 -05:00
|
|
|
span_lint_and_sugg(
|
2019-09-02 14:49:14 -05:00
|
|
|
cx,
|
|
|
|
REDUNDANT_PATTERN,
|
|
|
|
pat.span,
|
|
|
|
&format!(
|
|
|
|
"the `{} @ _` pattern can be written as just `{}`",
|
|
|
|
ident.name, ident.name,
|
|
|
|
),
|
2019-09-04 10:50:22 -05:00
|
|
|
"try",
|
2020-03-08 04:00:23 -05:00
|
|
|
format!("{}{}", left_binding, ident.name),
|
2019-09-04 10:50:22 -05:00
|
|
|
Applicability::MachineApplicable,
|
2019-09-02 14:49:14 -05:00
|
|
|
);
|
|
|
|
}
|
|
|
|
}
|
2019-09-12 01:25:05 -05:00
|
|
|
|
2019-09-12 01:36:05 -05:00
|
|
|
check_unneeded_wildcard_pattern(cx, pat);
|
2015-12-05 20:21:34 -06:00
|
|
|
}
|
2016-01-03 07:00:42 -06:00
|
|
|
|
2020-02-06 13:29:58 -06:00
|
|
|
fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, _: Span, _: NodeId) {
|
2018-09-11 18:34:52 -05:00
|
|
|
let mut registered_names: FxHashMap<String, Span> = FxHashMap::default();
|
2016-01-03 07:00:42 -06:00
|
|
|
|
2020-02-06 13:29:58 -06:00
|
|
|
for arg in &fn_kind.decl().inputs {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Ident(_, ident, None) = arg.pat.kind {
|
2018-06-28 08:46:58 -05:00
|
|
|
let arg_name = ident.to_string();
|
2016-01-03 07:00:42 -06:00
|
|
|
|
2016-02-14 21:40:43 -06:00
|
|
|
if arg_name.starts_with('_') {
|
2016-03-19 09:06:56 -05:00
|
|
|
if let Some(correspondence) = registered_names.get(&arg_name[1..]) {
|
2017-08-09 02:30:56 -05:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
DUPLICATE_UNDERSCORE_ARGUMENT,
|
|
|
|
*correspondence,
|
|
|
|
&format!(
|
|
|
|
"`{}` already exists, having another argument having almost the same \
|
2017-09-05 04:33:04 -05:00
|
|
|
name makes code comprehension and documentation more difficult",
|
2017-08-09 02:30:56 -05:00
|
|
|
arg_name[1..].to_owned()
|
|
|
|
),
|
2019-08-01 00:09:57 -05:00
|
|
|
);
|
2016-01-03 09:55:09 -06:00
|
|
|
}
|
|
|
|
} else {
|
2016-02-02 15:35:01 -06:00
|
|
|
registered_names.insert(arg_name, arg.pat.span);
|
2016-01-03 07:00:42 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2016-03-03 13:14:49 -06:00
|
|
|
|
2018-07-23 06:01:12 -05:00
|
|
|
fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
|
2018-07-24 01:55:38 -05:00
|
|
|
if in_external_macro(cx.sess(), expr.span) {
|
2017-05-09 10:15:13 -05:00
|
|
|
return;
|
|
|
|
}
|
2019-09-27 10:16:06 -05:00
|
|
|
match expr.kind {
|
2018-11-27 14:14:15 -06:00
|
|
|
ExprKind::Call(ref paren, _) => {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let ExprKind::Paren(ref closure) = paren.kind {
|
|
|
|
if let ExprKind::Closure(_, _, _, ref decl, ref block, _) = closure.kind {
|
2018-11-27 14:14:15 -06:00
|
|
|
let mut visitor = ReturnVisitor::new();
|
|
|
|
visitor.visit_expr(block);
|
|
|
|
if !visitor.found_return {
|
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
REDUNDANT_CLOSURE_CALL,
|
|
|
|
expr.span,
|
|
|
|
"Try not to call a closure in the expression where it is declared.",
|
|
|
|
|db| {
|
|
|
|
if decl.inputs.is_empty() {
|
2019-09-25 11:30:27 -05:00
|
|
|
let mut app = Applicability::MachineApplicable;
|
|
|
|
let hint =
|
|
|
|
snippet_with_applicability(cx, block.span, "..", &mut app).into_owned();
|
|
|
|
db.span_suggestion(expr.span, "Try doing something like: ", hint, app);
|
2018-11-27 14:14:15 -06:00
|
|
|
}
|
|
|
|
},
|
|
|
|
);
|
|
|
|
}
|
2018-11-14 00:01:39 -06:00
|
|
|
}
|
2016-08-05 11:30:07 -05:00
|
|
|
}
|
2016-12-20 11:21:30 -06:00
|
|
|
},
|
2018-11-27 14:14:15 -06:00
|
|
|
ExprKind::Unary(UnOp::Neg, ref inner) => {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let ExprKind::Unary(UnOp::Neg, _) = inner.kind {
|
2018-11-27 14:14:15 -06:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
DOUBLE_NEG,
|
|
|
|
expr.span,
|
|
|
|
"`--x` could be misinterpreted as pre-decrement by C programmers, is usually a no-op",
|
|
|
|
);
|
|
|
|
}
|
2017-09-05 04:33:04 -05:00
|
|
|
},
|
2019-10-03 14:09:32 -05:00
|
|
|
ExprKind::Lit(ref lit) => Self::check_lit(cx, lit),
|
2016-12-20 11:21:30 -06:00
|
|
|
_ => (),
|
2016-03-03 13:14:49 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-07-23 06:01:12 -05:00
|
|
|
fn check_block(&mut self, cx: &EarlyContext<'_>, block: &Block) {
|
2016-03-03 13:14:49 -06:00
|
|
|
for w in block.stmts.windows(2) {
|
2017-10-23 14:18:02 -05:00
|
|
|
if_chain! {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let StmtKind::Local(ref local) = w[0].kind;
|
2017-10-23 14:18:02 -05:00
|
|
|
if let Option::Some(ref t) = local.init;
|
2019-09-27 10:16:06 -05:00
|
|
|
if let ExprKind::Closure(..) = t.kind;
|
|
|
|
if let PatKind::Ident(_, ident, _) = local.pat.kind;
|
|
|
|
if let StmtKind::Semi(ref second) = w[1].kind;
|
2019-12-23 22:16:04 -06:00
|
|
|
if let ExprKind::Assign(_, ref call, _) = second.kind;
|
2019-09-27 10:16:06 -05:00
|
|
|
if let ExprKind::Call(ref closure, _) = call.kind;
|
|
|
|
if let ExprKind::Path(_, ref path) = closure.kind;
|
2017-10-23 14:18:02 -05:00
|
|
|
then {
|
2018-05-29 07:45:10 -05:00
|
|
|
if ident == path.segments[0].ident {
|
2017-10-23 14:18:02 -05:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
REDUNDANT_CLOSURE_CALL,
|
|
|
|
second.span,
|
|
|
|
"Closure called just once immediately after it was declared",
|
|
|
|
);
|
|
|
|
}
|
2016-03-03 13:14:49 -06:00
|
|
|
}
|
2017-10-23 14:18:02 -05:00
|
|
|
}
|
2016-03-03 13:14:49 -06:00
|
|
|
}
|
|
|
|
}
|
2015-12-05 20:21:34 -06:00
|
|
|
}
|
2017-05-09 10:15:28 -05:00
|
|
|
|
2019-04-08 15:43:55 -05:00
|
|
|
impl MiscEarlyLints {
|
2019-10-03 14:09:32 -05:00
|
|
|
fn check_lit(cx: &EarlyContext<'_>, lit: &Lit) {
|
2019-09-06 05:00:53 -05:00
|
|
|
// We test if first character in snippet is a number, because the snippet could be an expansion
|
|
|
|
// from a built-in macro like `line!()` or a proc-macro like `#[wasm_bindgen]`.
|
|
|
|
// Note that this check also covers special case that `line!()` is eagerly expanded by compiler.
|
|
|
|
// See <https://github.com/rust-lang/rust-clippy/issues/4507> for a regression.
|
|
|
|
// FIXME: Find a better way to detect those cases.
|
2019-08-26 04:11:43 -05:00
|
|
|
let lit_snip = match snippet_opt(cx, lit.span) {
|
2019-09-06 05:00:53 -05:00
|
|
|
Some(snip) if snip.chars().next().map_or(false, |c| c.is_digit(10)) => snip,
|
2019-08-26 04:11:43 -05:00
|
|
|
_ => return,
|
|
|
|
};
|
|
|
|
|
2019-09-27 10:16:06 -05:00
|
|
|
if let LitKind::Int(value, lit_int_type) = lit.kind {
|
2019-08-26 04:11:43 -05:00
|
|
|
let suffix = match lit_int_type {
|
2019-11-07 06:27:00 -06:00
|
|
|
LitIntType::Signed(ty) => ty.name_str(),
|
|
|
|
LitIntType::Unsigned(ty) => ty.name_str(),
|
2019-08-26 04:11:43 -05:00
|
|
|
LitIntType::Unsuffixed => "",
|
|
|
|
};
|
|
|
|
|
2020-02-02 19:42:21 -06:00
|
|
|
let maybe_last_sep_idx = if let Some(val) = lit_snip.len().checked_sub(suffix.len() + 1) {
|
|
|
|
val
|
|
|
|
} else {
|
|
|
|
return; // It's useless so shouldn't lint.
|
|
|
|
};
|
2019-08-26 04:11:43 -05:00
|
|
|
// Do not lint when literal is unsuffixed.
|
|
|
|
if !suffix.is_empty() && lit_snip.as_bytes()[maybe_last_sep_idx] != b'_' {
|
|
|
|
span_lint_and_sugg(
|
|
|
|
cx,
|
|
|
|
UNSEPARATED_LITERAL_SUFFIX,
|
|
|
|
lit.span,
|
|
|
|
"integer type suffix should be separated by an underscore",
|
|
|
|
"add an underscore",
|
|
|
|
format!("{}_{}", &lit_snip[..=maybe_last_sep_idx], suffix),
|
|
|
|
Applicability::MachineApplicable,
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
2020-02-12 23:39:29 -06:00
|
|
|
if lit_snip.starts_with("0x") {
|
|
|
|
if maybe_last_sep_idx <= 2 {
|
|
|
|
// It's meaningless or causes range error.
|
|
|
|
return;
|
|
|
|
}
|
2019-08-26 04:11:43 -05:00
|
|
|
let mut seen = (false, false);
|
|
|
|
for ch in lit_snip.as_bytes()[2..=maybe_last_sep_idx].iter() {
|
|
|
|
match ch {
|
|
|
|
b'a'..=b'f' => seen.0 = true,
|
|
|
|
b'A'..=b'F' => seen.1 = true,
|
|
|
|
_ => {},
|
2017-10-23 14:18:02 -05:00
|
|
|
}
|
|
|
|
if seen.0 && seen.1 {
|
2019-08-26 04:11:43 -05:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
MIXED_CASE_HEX_LITERALS,
|
|
|
|
lit.span,
|
|
|
|
"inconsistent casing in hexadecimal literal",
|
|
|
|
);
|
|
|
|
break;
|
2017-10-23 14:18:02 -05:00
|
|
|
}
|
2019-08-26 04:11:43 -05:00
|
|
|
}
|
|
|
|
} else if lit_snip.starts_with("0b") || lit_snip.starts_with("0o") {
|
|
|
|
/* nothing to do */
|
|
|
|
} else if value != 0 && lit_snip.starts_with('0') {
|
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
ZERO_PREFIXED_LITERAL,
|
|
|
|
lit.span,
|
|
|
|
"this is a decimal constant",
|
|
|
|
|db| {
|
2019-01-27 06:33:56 -06:00
|
|
|
db.span_suggestion(
|
2017-10-23 14:18:02 -05:00
|
|
|
lit.span,
|
2019-08-26 04:11:43 -05:00
|
|
|
"if you mean to use a decimal constant, remove the `0` to avoid confusion",
|
|
|
|
lit_snip.trim_start_matches(|c| c == '_' || c == '0').to_string(),
|
2018-09-18 12:01:17 -05:00
|
|
|
Applicability::MaybeIncorrect,
|
2017-10-23 14:18:02 -05:00
|
|
|
);
|
2019-01-27 06:33:56 -06:00
|
|
|
db.span_suggestion(
|
2017-10-23 14:18:02 -05:00
|
|
|
lit.span,
|
|
|
|
"if you mean to use an octal constant, use `0o`",
|
2019-08-26 04:11:43 -05:00
|
|
|
format!("0o{}", lit_snip.trim_start_matches(|c| c == '_' || c == '0')),
|
2018-09-18 12:01:17 -05:00
|
|
|
Applicability::MaybeIncorrect,
|
2017-10-23 14:18:02 -05:00
|
|
|
);
|
2019-08-26 04:11:43 -05:00
|
|
|
},
|
|
|
|
);
|
2017-05-09 10:15:28 -05:00
|
|
|
}
|
2019-11-07 06:27:00 -06:00
|
|
|
} else if let LitKind::Float(_, LitFloatType::Suffixed(float_ty)) = lit.kind {
|
|
|
|
let suffix = float_ty.name_str();
|
2020-02-02 19:42:21 -06:00
|
|
|
let maybe_last_sep_idx = if let Some(val) = lit_snip.len().checked_sub(suffix.len() + 1) {
|
|
|
|
val
|
|
|
|
} else {
|
|
|
|
return; // It's useless so shouldn't lint.
|
|
|
|
};
|
2019-08-26 04:11:43 -05:00
|
|
|
if lit_snip.as_bytes()[maybe_last_sep_idx] != b'_' {
|
|
|
|
span_lint_and_sugg(
|
|
|
|
cx,
|
|
|
|
UNSEPARATED_LITERAL_SUFFIX,
|
|
|
|
lit.span,
|
|
|
|
"float type suffix should be separated by an underscore",
|
|
|
|
"add an underscore",
|
|
|
|
format!("{}_{}", &lit_snip[..=maybe_last_sep_idx], suffix),
|
|
|
|
Applicability::MachineApplicable,
|
|
|
|
);
|
2017-05-09 10:15:28 -05:00
|
|
|
}
|
2017-10-23 14:18:02 -05:00
|
|
|
}
|
2017-05-09 10:15:28 -05:00
|
|
|
}
|
|
|
|
}
|
2019-09-12 01:36:05 -05:00
|
|
|
|
|
|
|
fn check_unneeded_wildcard_pattern(cx: &EarlyContext<'_>, pat: &Pat) {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::TupleStruct(_, ref patterns) | PatKind::Tuple(ref patterns) = pat.kind {
|
2019-09-12 01:36:05 -05:00
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fn span_lint(cx: &EarlyContext<'_>, span: Span, only_one: bool) {
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|
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span_lint_and_sugg(
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cx,
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|
UNNEEDED_WILDCARD_PATTERN,
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|
|
|
span,
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|
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if only_one {
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|
|
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"this pattern is unneeded as the `..` pattern can match that element"
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} else {
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|
|
|
"these patterns are unneeded as the `..` pattern can match those elements"
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|
},
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|
if only_one { "remove it" } else { "remove them" },
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|
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"".to_string(),
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|
|
|
Applicability::MachineApplicable,
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|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[allow(clippy::trivially_copy_pass_by_ref)]
|
|
|
|
fn is_wild<P: std::ops::Deref<Target = Pat>>(pat: &&P) -> bool {
|
2019-09-27 10:16:06 -05:00
|
|
|
if let PatKind::Wild = pat.kind {
|
2019-09-12 01:36:05 -05:00
|
|
|
true
|
|
|
|
} else {
|
|
|
|
false
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|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-09-13 01:20:27 -05:00
|
|
|
if let Some(rest_index) = patterns.iter().position(|pat| pat.is_rest()) {
|
2019-09-12 01:36:05 -05:00
|
|
|
if let Some((left_index, left_pat)) = patterns[..rest_index]
|
|
|
|
.iter()
|
|
|
|
.rev()
|
|
|
|
.take_while(is_wild)
|
|
|
|
.enumerate()
|
|
|
|
.last()
|
|
|
|
{
|
|
|
|
span_lint(cx, left_pat.span.until(patterns[rest_index].span), left_index == 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
if let Some((right_index, right_pat)) =
|
|
|
|
patterns[rest_index + 1..].iter().take_while(is_wild).enumerate().last()
|
|
|
|
{
|
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
patterns[rest_index].span.shrink_to_hi().to(right_pat.span),
|
|
|
|
right_index == 0,
|
|
|
|
);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|