+use crate::utils::{implements_trait, is_copy, multispan_sugg, snippet, span_lint, span_lint_and_then, SpanlessEq};
use rustc::hir::*;
-use rustc::lint::*;
-use rustc::{declare_lint, lint_array};
-use crate::utils::{in_macro, implements_trait, is_copy, multispan_sugg, snippet, span_lint, span_lint_and_then, SpanlessEq};
+use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::{declare_lint_pass, declare_tool_lint};
+use rustc_errors::Applicability;
-/// **What it does:** Checks for equal operands to comparison, logical and
-/// bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
-/// `||`, `&`, `|`, `^`, `-` and `/`).
-///
-/// **Why is this bad?** This is usually just a typo or a copy and paste error.
-///
-/// **Known problems:** False negatives: We had some false positives regarding
-/// calls (notably [racer](https://github.com/phildawes/racer) had one instance
-/// of `x.pop() && x.pop()`), so we removed matching any function or method
-/// calls. We may introduce a whitelist of known pure functions in the future.
-///
-/// **Example:**
-/// ```rust
-/// x + 1 == x + 1
-/// ```
declare_clippy_lint! {
+ /// **What it does:** Checks for equal operands to comparison, logical and
+ /// bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
+ /// `||`, `&`, `|`, `^`, `-` and `/`).
+ ///
+ /// **Why is this bad?** This is usually just a typo or a copy and paste error.
+ ///
+ /// **Known problems:** False negatives: We had some false positives regarding
+ /// calls (notably [racer](https://github.com/phildawes/racer) had one instance
+ /// of `x.pop() && x.pop()`), so we removed matching any function or method
+ /// calls. We may introduce a whitelist of known pure functions in the future.
+ ///
+ /// **Example:**
+ /// ```rust
+ /// # let x = 1;
+ /// if x + 1 == x + 1 {}
+ /// ```
pub EQ_OP,
correctness,
- "equal operands on both sides of a comparison or bitwise combination (e.g. `x == x`)"
+ "equal operands on both sides of a comparison or bitwise combination (e.g., `x == x`)"
}
-/// **What it does:** Checks for arguments to `==` which have their address
-/// taken to satisfy a bound
-/// and suggests to dereference the other argument instead
-///
-/// **Why is this bad?** It is more idiomatic to dereference the other argument.
-///
-/// **Known problems:** None
-///
-/// **Example:**
-/// ```rust
-/// &x == y
-/// ```
declare_clippy_lint! {
+ /// **What it does:** Checks for arguments to `==` which have their address
+ /// taken to satisfy a bound
+ /// and suggests to dereference the other argument instead
+ ///
+ /// **Why is this bad?** It is more idiomatic to dereference the other argument.
+ ///
+ /// **Known problems:** None
+ ///
+ /// **Example:**
+ /// ```ignore
+ /// &x == y
+ /// ```
pub OP_REF,
style,
"taking a reference to satisfy the type constraints on `==`"
}
-#[derive(Copy, Clone)]
-pub struct EqOp;
-
-impl LintPass for EqOp {
- fn get_lints(&self) -> LintArray {
- lint_array!(EQ_OP, OP_REF)
- }
-}
+declare_lint_pass!(EqOp => [EQ_OP, OP_REF]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EqOp {
+ #[allow(clippy::similar_names, clippy::too_many_lines)]
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
if let ExprKind::Binary(op, ref left, ref right) = e.node {
- if in_macro(e.span) {
+ if e.span.from_expansion() {
return;
}
if is_valid_operator(op) && SpanlessEq::new(cx).ignore_fn().eq_expr(left, right) {
BinOpKind::Shl => (cx.tcx.lang_items().shl_trait(), false),
BinOpKind::Shr => (cx.tcx.lang_items().shr_trait(), false),
BinOpKind::Ne | BinOpKind::Eq => (cx.tcx.lang_items().eq_trait(), true),
- BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ge | BinOpKind::Gt => (cx.tcx.lang_items().ord_trait(), true),
+ BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ge | BinOpKind::Gt => {
+ (cx.tcx.lang_items().ord_trait(), true)
+ },
};
if let Some(trait_id) = trait_id {
- #[allow(match_same_arms)]
+ #[allow(clippy::match_same_arms)]
match (&left.node, &right.node) {
// do not suggest to dereference literals
(&ExprKind::Lit(..), _) | (_, &ExprKind::Lit(..)) => {},
);
},
)
- } else if lcpy && !rcpy && implements_trait(cx, lty, trait_id, &[cx.tables.expr_ty(right).into()]) {
+ } else if lcpy
+ && !rcpy
+ && implements_trait(cx, lty, trait_id, &[cx.tables.expr_ty(right).into()])
+ {
span_lint_and_then(cx, OP_REF, e.span, "needlessly taken reference of left operand", |db| {
let lsnip = snippet(cx, l.span, "...").to_string();
- db.span_suggestion(left.span, "use the left value directly", lsnip);
+ db.span_suggestion(
+ left.span,
+ "use the left value directly",
+ lsnip,
+ Applicability::MachineApplicable, // snippet
+ );
})
- } else if !lcpy && rcpy && implements_trait(cx, cx.tables.expr_ty(left), trait_id, &[rty.into()]) {
+ } else if !lcpy
+ && rcpy
+ && implements_trait(cx, cx.tables.expr_ty(left), trait_id, &[rty.into()])
+ {
span_lint_and_then(
cx,
OP_REF,
"needlessly taken reference of right operand",
|db| {
let rsnip = snippet(cx, r.span, "...").to_string();
- db.span_suggestion(right.span, "use the right value directly", rsnip);
+ db.span_suggestion(
+ right.span,
+ "use the right value directly",
+ rsnip,
+ Applicability::MachineApplicable, // snippet
+ );
},
)
}
(&ExprKind::AddrOf(_, ref l), _) => {
let lty = cx.tables.expr_ty(l);
let lcpy = is_copy(cx, lty);
- if (requires_ref || lcpy) && implements_trait(cx, lty, trait_id, &[cx.tables.expr_ty(right).into()]) {
+ if (requires_ref || lcpy)
+ && implements_trait(cx, lty, trait_id, &[cx.tables.expr_ty(right).into()])
+ {
span_lint_and_then(cx, OP_REF, e.span, "needlessly taken reference of left operand", |db| {
let lsnip = snippet(cx, l.span, "...").to_string();
- db.span_suggestion(left.span, "use the left value directly", lsnip);
+ db.span_suggestion(
+ left.span,
+ "use the left value directly",
+ lsnip,
+ Applicability::MachineApplicable, // snippet
+ );
})
}
},
(_, &ExprKind::AddrOf(_, ref r)) => {
let rty = cx.tables.expr_ty(r);
let rcpy = is_copy(cx, rty);
- if (requires_ref || rcpy) && implements_trait(cx, cx.tables.expr_ty(left), trait_id, &[rty.into()]) {
+ if (requires_ref || rcpy)
+ && implements_trait(cx, cx.tables.expr_ty(left), trait_id, &[rty.into()])
+ {
span_lint_and_then(cx, OP_REF, e.span, "taken reference of right operand", |db| {
let rsnip = snippet(cx, r.span, "...").to_string();
- db.span_suggestion(right.span, "use the right value directly", rsnip);
+ db.span_suggestion(
+ right.span,
+ "use the right value directly",
+ rsnip,
+ Applicability::MachineApplicable, // snippet
+ );
})
}
},
}
}
-
fn is_valid_operator(op: BinOp) -> bool {
match op.node {
- BinOpKind::Sub | BinOpKind::Div | BinOpKind::Eq | BinOpKind::Lt | BinOpKind::Le | BinOpKind::Gt | BinOpKind::Ge | BinOpKind::Ne | BinOpKind::And | BinOpKind::Or | BinOpKind::BitXor | BinOpKind::BitAnd | BinOpKind::BitOr => true,
+ BinOpKind::Sub
+ | BinOpKind::Div
+ | BinOpKind::Eq
+ | BinOpKind::Lt
+ | BinOpKind::Le
+ | BinOpKind::Gt
+ | BinOpKind::Ge
+ | BinOpKind::Ne
+ | BinOpKind::And
+ | BinOpKind::Or
+ | BinOpKind::BitXor
+ | BinOpKind::BitAnd
+ | BinOpKind::BitOr => true,
_ => false,
}
}
projects / rust.git / blobdiff