// option. This file may not be copied, modified, or distributed
// except according to those terms.
-
+use crate::consts::{constant, Constant};
use crate::rustc::hir::*;
-use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use crate::rustc::{declare_tool_lint, lint_array};
-use if_chain::if_chain;
+use crate::rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
use crate::rustc::ty::{self, Ty};
-use std::cmp::Ordering;
-use std::collections::Bound;
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc_errors::Applicability;
use crate::syntax::ast::LitKind;
use crate::syntax::source_map::Span;
use crate::utils::paths;
-use crate::utils::{expr_block, in_macro, is_allowed, is_expn_of, match_qpath, match_type,
- multispan_sugg, remove_blocks, snippet, snippet_with_applicability, span_lint_and_sugg, span_lint_and_then,
- span_note_and_lint, walk_ptrs_ty};
use crate::utils::sugg::Sugg;
-use crate::consts::{constant, Constant};
-use crate::rustc_errors::Applicability;
+use crate::utils::{
+ expr_block, in_macro, is_allowed, is_expn_of, match_qpath, match_type, multispan_sugg, remove_blocks, snippet,
+ snippet_with_applicability, span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty,
+};
+use if_chain::if_chain;
+use std::cmp::Ordering;
+use std::collections::Bound;
/// **What it does:** Checks for matches with a single arm where an `if let`
/// will usually suffice.
/// ```rust
/// match x {
/// Some(ref foo) => bar(foo),
-/// _ => ()
+/// _ => (),
/// }
/// ```
declare_clippy_lint! {
pub SINGLE_MATCH,
style,
- "a match statement with a single nontrivial arm (i.e. where the other arm \
- is `_ => {}`) instead of `if let`"
+ "a match statement with a single nontrivial arm (i.e. where the other arm is `_ => {}`) instead of `if let`"
}
/// **What it does:** Checks for matches with a two arms where an `if let` will
declare_clippy_lint! {
pub SINGLE_MATCH_ELSE,
pedantic,
- "a match statement with a two arms where the second arm's pattern is a wildcard \
- instead of `if let`"
+ "a match statement with a two arms where the second arm's pattern is a wildcard instead of `if let`"
}
/// **What it does:** Checks for matches where all arms match a reference,
/// ```rust
/// let x = 5;
/// match x {
-/// 1 ... 10 => println!("1 ... 10"),
-/// 5 ... 15 => println!("5 ... 15"),
+/// 1...10 => println!("1 ... 10"),
+/// 5...15 => println!("5 ... 15"),
/// _ => (),
/// }
/// ```
///
/// **Example:**
/// ```rust
-/// let x : Result(i32, &str) = Ok(3);
+/// let x: Result(i32, &str) = Ok(3);
/// match x {
/// Ok(_) => println!("ok"),
/// Err(_) => panic!("err"),
/// ```rust
/// let x: Option<()> = None;
/// let r: Option<&()> = match x {
-/// None => None,
-/// Some(ref v) => Some(v),
+/// None => None,
+/// Some(ref v) => Some(v),
/// };
/// ```
declare_clippy_lint! {
}
}
-fn check_single_match_single_pattern(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm], expr: &Expr, els: Option<&Expr>) {
+fn check_single_match_single_pattern(
+ cx: &LateContext<'_, '_>,
+ ex: &Expr,
+ arms: &[Arm],
+ expr: &Expr,
+ els: Option<&Expr>,
+) {
if is_wild(&arms[1].pats[0]) {
report_single_match_single_pattern(cx, ex, arms, expr, els);
}
}
-fn report_single_match_single_pattern(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm], expr: &Expr, els: Option<&Expr>) {
- let lint = if els.is_some() {
- SINGLE_MATCH_ELSE
- } else {
- SINGLE_MATCH
- };
- let els_str = els.map_or(String::new(), |els| format!(" else {}", expr_block(cx, els, None, "..")));
+fn report_single_match_single_pattern(
+ cx: &LateContext<'_, '_>,
+ ex: &Expr,
+ arms: &[Arm],
+ expr: &Expr,
+ els: Option<&Expr>,
+) {
+ let lint = if els.is_some() { SINGLE_MATCH_ELSE } else { SINGLE_MATCH };
+ let els_str = els.map_or(String::new(), |els| {
+ format!(" else {}", expr_block(cx, els, None, ".."))
+ });
span_lint_and_sugg(
cx,
lint,
);
}
-fn check_single_match_opt_like(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm], expr: &Expr, ty: Ty<'_>, els: Option<&Expr>) {
+fn check_single_match_opt_like(
+ cx: &LateContext<'_, '_>,
+ ex: &Expr,
+ arms: &[Arm],
+ expr: &Expr,
+ ty: Ty<'_>,
+ els: Option<&Expr>,
+) {
// list of candidate Enums we know will never get any more members
let candidates = &[
(&paths::COW, "Borrowed"),
}
fn check_match_as_ref(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm], expr: &Expr) {
- if arms.len() == 2 &&
- arms[0].pats.len() == 1 && arms[0].guard.is_none() &&
- arms[1].pats.len() == 1 && arms[1].guard.is_none() {
+ if arms.len() == 2
+ && arms[0].pats.len() == 1
+ && arms[0].guard.is_none()
+ && arms[1].pats.len() == 1
+ && arms[1].guard.is_none()
+ {
let arm_ref: Option<BindingAnnotation> = if is_none_arm(&arms[0]) {
is_ref_some_arm(&arms[1])
} else if is_none_arm(&arms[1]) {
None
};
if let Some(rb) = arm_ref {
- let suggestion = if rb == BindingAnnotation::Ref { "as_ref" } else { "as_mut" };
+ let suggestion = if rb == BindingAnnotation::Ref {
+ "as_ref"
+ } else {
+ "as_mut"
+ };
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(
cx,
expr.span,
&format!("use {}() instead", suggestion),
"try this",
- format!("{}.{}()", snippet_with_applicability(cx, ex.span, "_", &mut applicability), suggestion),
+ format!(
+ "{}.{}()",
+ snippet_with_applicability(cx, ex.span, "_", &mut applicability),
+ suggestion
+ ),
applicability,
)
}
}
/// Get all arms that are unbounded `PatRange`s.
-fn all_ranges<'a, 'tcx>(
- cx: &LateContext<'a, 'tcx>,
- arms: &'tcx [Arm],
-) -> Vec<SpannedRange<Constant>> {
+fn all_ranges<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, arms: &'tcx [Arm]) -> Vec<SpannedRange<Constant>> {
arms.iter()
.flat_map(|arm| {
if let Arm {
- ref pats,
- guard: None,
- ..
+ ref pats, guard: None, ..
} = *arm
{
pats.iter()
} else {
[].iter()
- }.filter_map(|pat| {
+ }
+ .filter_map(|pat| {
if let PatKind::Range(ref lhs, ref rhs, ref range_end) = pat.node {
let lhs = constant(cx, cx.tables, lhs)?.0;
let rhs = constant(cx, cx.tables, rhs)?.0;
RangeEnd::Included => Bound::Included(rhs),
RangeEnd::Excluded => Bound::Excluded(rhs),
};
- return Some(SpannedRange { span: pat.span, node: (lhs, rhs) });
+ return Some(SpannedRange {
+ span: pat.span,
+ node: (lhs, rhs),
+ });
}
if let PatKind::Lit(ref value) = pat.node {
let value = constant(cx, cx.tables, value)?.0;
- return Some(SpannedRange { span: pat.span, node: (value.clone(), Bound::Included(value)) });
+ return Some(SpannedRange {
+ span: pat.span,
+ node: (value.clone(), Bound::Included(value)),
+ });
}
None
ranges
.iter()
.filter_map(|range| match range.node {
- (
- Constant::Int(start),
- Bound::Included(Constant::Int(end)),
- ) => Some(SpannedRange {
+ (Constant::Int(start), Bound::Included(Constant::Int(end))) => Some(SpannedRange {
span: range.span,
node: (start, Bound::Included(end)),
}),
- (
- Constant::Int(start),
- Bound::Excluded(Constant::Int(end)),
- ) => Some(SpannedRange {
+ (Constant::Int(start), Bound::Excluded(Constant::Int(end))) => Some(SpannedRange {
span: range.span,
node: (start, Bound::Excluded(end)),
}),
- (
- Constant::Int(start),
- Bound::Unbounded,
- ) => Some(SpannedRange {
+ (Constant::Int(start), Bound::Unbounded) => Some(SpannedRange {
span: range.span,
node: (start, Bound::Unbounded),
}),
}
fn has_only_ref_pats(arms: &[Arm]) -> bool {
- let mapped = arms.iter()
+ let mapped = arms
+ .iter()
.flat_map(|a| &a.pats)
.map(|p| {
match p.node {
for (a, b) in values.iter().zip(values.iter().skip(1)) {
match (a, b) {
- (&Kind::Start(_, ra), &Kind::End(_, rb)) => if ra.node != rb.node {
- return Some((ra, rb));
+ (&Kind::Start(_, ra), &Kind::End(_, rb)) => {
+ if ra.node != rb.node {
+ return Some((ra, rb));
+ }
},
(&Kind::End(a, _), &Kind::Start(b, _)) if a != Bound::Included(b) => (),
_ => return Some((a.range(), b.range())),
projects / rust.git / blobdiff