mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-27 07:00:55 +00:00
refactored Option usage and fn argument types, improved formatting
This commit is contained in:
llogiq
parent
5b1287f017
commit
158935a38d
5 changed files with 112 additions and 78 deletions
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@ -49,13 +49,11 @@ impl LintPass for BitMask {
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fn check_expr(&mut self, cx: &Context, e: &Expr) {
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if let ExprBinary(ref cmp, ref left, ref right) = e.node {
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if is_comparison_binop(cmp.node) {
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let cmp_opt = fetch_int_literal(cx, right);
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if cmp_opt.is_some() {
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check_compare(cx, left, cmp.node, cmp_opt.unwrap(), &e.span);
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} else {
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fetch_int_literal(cx, left).map(|cmp_val|
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check_compare(cx, right, invert_cmp(cmp.node), cmp_val, &e.span));
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}
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fetch_int_literal(cx, right).map(|cmp_opt|
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check_compare(cx, left, cmp.node, cmp_opt, &e.span))
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.unwrap_or_else(|| fetch_int_literal(cx, left).map(|cmp_val|
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check_compare(cx, right, invert_cmp(cmp.node), cmp_val,
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&e.span)).unwrap_or(()))
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}
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}
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}
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135
src/eq_op.rs
135
src/eq_op.rs
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@ -21,7 +21,9 @@ impl LintPass for EqOp {
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fn check_expr(&mut self, cx: &Context, e: &Expr) {
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if let ExprBinary(ref op, ref left, ref right) = e.node {
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if is_cmp_or_bit(op) && is_exp_equal(left, right) {
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cx.span_lint(EQ_OP, e.span, &format!("equal expressions as operands to {}", ast_util::binop_to_string(op.node)));
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cx.span_lint(EQ_OP, e.span, &format!(
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"equal expressions as operands to {}",
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ast_util::binop_to_string(op.node)));
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}
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}
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}
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@ -29,32 +31,39 @@ impl LintPass for EqOp {
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fn is_exp_equal(left : &Expr, right : &Expr) -> bool {
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match (&left.node, &right.node) {
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(&ExprBinary(ref lop, ref ll, ref lr), &ExprBinary(ref rop, ref rl, ref rr)) =>
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(&ExprBinary(ref lop, ref ll, ref lr),
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&ExprBinary(ref rop, ref rl, ref rr)) =>
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lop.node == rop.node && is_exp_equal(ll, rl) && is_exp_equal(lr, rr),
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(&ExprBox(ref lpl, ref lboxedpl), &ExprBox(ref rpl, ref rboxedpl)) =>
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both(lpl, rpl, |l, r| is_exp_equal(l, r)) && is_exp_equal(lboxedpl, rboxedpl),
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both(lpl, rpl, |l, r| is_exp_equal(l, r)) &&
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is_exp_equal(lboxedpl, rboxedpl),
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(&ExprCall(ref lcallee, ref largs), &ExprCall(ref rcallee, ref rargs)) =>
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is_exp_equal(lcallee, rcallee) && is_exp_vec_equal(largs, rargs),
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is_exp_equal(lcallee, rcallee) && is_exps_equal(largs, rargs),
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(&ExprCast(ref lcast, ref lty), &ExprCast(ref rcast, ref rty)) =>
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is_ty_equal(lty, rty) && is_exp_equal(lcast, rcast),
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(&ExprField(ref lfexp, ref lfident), &ExprField(ref rfexp, ref rfident)) =>
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(&ExprField(ref lfexp, ref lfident),
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&ExprField(ref rfexp, ref rfident)) =>
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lfident.node == rfident.node && is_exp_equal(lfexp, rfexp),
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(&ExprLit(ref llit), &ExprLit(ref rlit)) => llit.node == rlit.node,
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(&ExprMethodCall(ref lident, ref lcty, ref lmargs), &ExprMethodCall(ref rident, ref rcty, ref rmargs)) =>
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lident.node == rident.node && is_ty_vec_equal(lcty, rcty) && is_exp_vec_equal(lmargs, rmargs),
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(&ExprParen(ref lparen), &ExprParen(ref rparen)) => is_exp_equal(lparen, rparen),
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(&ExprMethodCall(ref lident, ref lcty, ref lmargs),
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&ExprMethodCall(ref rident, ref rcty, ref rmargs)) =>
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lident.node == rident.node && is_tys_equal(lcty, rcty) &&
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is_exps_equal(lmargs, rmargs),
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(&ExprParen(ref lparen), _) => is_exp_equal(lparen, right),
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(_, &ExprParen(ref rparen)) => is_exp_equal(left, rparen),
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(&ExprPath(ref lqself, ref lsubpath), &ExprPath(ref rqself, ref rsubpath)) =>
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both(lqself, rqself, |l, r| is_qself_equal(l, r)) && is_path_equal(lsubpath, rsubpath),
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(&ExprTup(ref ltup), &ExprTup(ref rtup)) => is_exp_vec_equal(ltup, rtup),
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(&ExprUnary(lunop, ref lparam), &ExprUnary(runop, ref rparam)) => lunop == runop && is_exp_equal(lparam, rparam),
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(&ExprVec(ref lvec), &ExprVec(ref rvec)) => is_exp_vec_equal(lvec, rvec),
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(&ExprPath(ref lqself, ref lsubpath),
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&ExprPath(ref rqself, ref rsubpath)) =>
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both(lqself, rqself, |l, r| is_qself_equal(l, r)) &&
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is_path_equal(lsubpath, rsubpath),
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(&ExprTup(ref ltup), &ExprTup(ref rtup)) => is_exps_equal(ltup, rtup),
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(&ExprUnary(lunop, ref lparam), &ExprUnary(runop, ref rparam)) =>
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lunop == runop && is_exp_equal(lparam, rparam),
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(&ExprVec(ref lvec), &ExprVec(ref rvec)) => is_exps_equal(lvec, rvec),
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_ => false
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}
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}
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fn is_exp_vec_equal(left : &Vec<P<Expr>>, right : &Vec<P<Expr>>) -> bool {
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fn is_exps_equal(left : &[P<Expr>], right : &[P<Expr>]) -> bool {
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over(left, right, |l, r| is_exp_equal(l, r))
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}
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@ -69,19 +78,25 @@ fn is_qself_equal(left : &QSelf, right : &QSelf) -> bool {
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fn is_ty_equal(left : &Ty, right : &Ty) -> bool {
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match (&left.node, &right.node) {
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(&TyVec(ref lvec), &TyVec(ref rvec)) => is_ty_equal(lvec, rvec),
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(&TyFixedLengthVec(ref lfvty, ref lfvexp), &TyFixedLengthVec(ref rfvty, ref rfvexp)) =>
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(&TyFixedLengthVec(ref lfvty, ref lfvexp),
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&TyFixedLengthVec(ref rfvty, ref rfvexp)) =>
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is_ty_equal(lfvty, rfvty) && is_exp_equal(lfvexp, rfvexp),
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(&TyPtr(ref lmut), &TyPtr(ref rmut)) => is_mut_ty_equal(lmut, rmut),
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(&TyRptr(ref ltime, ref lrmut), &TyRptr(ref rtime, ref rrmut)) =>
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both(ltime, rtime, is_lifetime_equal) && is_mut_ty_equal(lrmut, rrmut),
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(&TyBareFn(ref lbare), &TyBareFn(ref rbare)) => is_bare_fn_ty_equal(lbare, rbare),
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(&TyTup(ref ltup), &TyTup(ref rtup)) => is_ty_vec_equal(ltup, rtup),
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(&TyPath(Option::None, ref lpath), &TyPath(Option::None, ref rpath)) => is_path_equal(lpath, rpath),
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(&TyPath(Option::Some(ref lqself), ref lsubpath), &TyPath(Option::Some(ref rqself), ref rsubpath)) =>
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(&TyBareFn(ref lbare), &TyBareFn(ref rbare)) =>
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is_bare_fn_ty_equal(lbare, rbare),
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(&TyTup(ref ltup), &TyTup(ref rtup)) => is_tys_equal(ltup, rtup),
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(&TyPath(Option::None, ref lpath), &TyPath(Option::None, ref rpath)) =>
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is_path_equal(lpath, rpath),
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(&TyPath(Option::Some(ref lqself), ref lsubpath),
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&TyPath(Option::Some(ref rqself), ref rsubpath)) =>
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is_qself_equal(lqself, rqself) && is_path_equal(lsubpath, rsubpath),
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(&TyObjectSum(ref lsumty, ref lobounds), &TyObjectSum(ref rsumty, ref robounds)) =>
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(&TyObjectSum(ref lsumty, ref lobounds),
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&TyObjectSum(ref rsumty, ref robounds)) =>
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is_ty_equal(lsumty, rsumty) && is_param_bounds_equal(lobounds, robounds),
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(&TyPolyTraitRef(ref ltbounds), &TyPolyTraitRef(ref rtbounds)) => is_param_bounds_equal(ltbounds, rtbounds),
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(&TyPolyTraitRef(ref ltbounds), &TyPolyTraitRef(ref rtbounds)) =>
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is_param_bounds_equal(ltbounds, rtbounds),
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(&TyParen(ref lty), &TyParen(ref rty)) => is_ty_equal(lty, rty),
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(&TyTypeof(ref lof), &TyTypeof(ref rof)) => is_exp_equal(lof, rof),
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(&TyInfer, &TyInfer) => true,
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@ -91,15 +106,17 @@ fn is_ty_equal(left : &Ty, right : &Ty) -> bool {
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fn is_param_bound_equal(left : &TyParamBound, right : &TyParamBound) -> bool {
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match(left, right) {
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(&TraitTyParamBound(ref lpoly, ref lmod), &TraitTyParamBound(ref rpoly, ref rmod)) =>
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(&TraitTyParamBound(ref lpoly, ref lmod),
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&TraitTyParamBound(ref rpoly, ref rmod)) =>
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lmod == rmod && is_poly_traitref_equal(lpoly, rpoly),
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(&RegionTyParamBound(ref ltime), &RegionTyParamBound(ref rtime)) => is_lifetime_equal(ltime, rtime),
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(&RegionTyParamBound(ref ltime), &RegionTyParamBound(ref rtime)) =>
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is_lifetime_equal(ltime, rtime),
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_ => false
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}
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}
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fn is_poly_traitref_equal(left : &PolyTraitRef, right : &PolyTraitRef) -> bool {
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is_lifetimedef_vec_equal(&left.bound_lifetimes, &right.bound_lifetimes) &&
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is_lifetimedefs_equal(&left.bound_lifetimes, &right.bound_lifetimes) &&
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is_path_equal(&left.trait_ref.path, &right.trait_ref.path)
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}
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@ -113,11 +130,12 @@ fn is_mut_ty_equal(left : &MutTy, right : &MutTy) -> bool {
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fn is_bare_fn_ty_equal(left : &BareFnTy, right : &BareFnTy) -> bool {
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left.unsafety == right.unsafety && left.abi == right.abi &&
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is_lifetimedef_vec_equal(&left.lifetimes, &right.lifetimes) && is_fndecl_equal(&left.decl, &right.decl)
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is_lifetimedefs_equal(&left.lifetimes, &right.lifetimes) &&
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is_fndecl_equal(&left.decl, &right.decl)
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}
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fn is_fndecl_equal(left : &P<FnDecl>, right : &P<FnDecl>) -> bool {
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left.variadic == right.variadic && is_arg_vec_equal(&left.inputs, &right.inputs) &&
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left.variadic == right.variadic && is_args_equal(&left.inputs, &right.inputs) &&
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is_fnret_ty_equal(&left.output, &right.output)
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}
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@ -133,44 +151,56 @@ fn is_arg_equal(left : &Arg, right : &Arg) -> bool {
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is_ty_equal(&left.ty, &right.ty) && is_pat_equal(&left.pat, &right.pat)
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}
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fn is_arg_vec_equal(left : &Vec<Arg>, right : &Vec<Arg>) -> bool {
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fn is_args_equal(left : &[Arg], right : &[Arg]) -> bool {
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over(left, right, is_arg_equal)
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}
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fn is_pat_equal(left : &Pat, right : &Pat) -> bool {
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match(&left.node, &right.node) {
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(&PatWild(lwild), &PatWild(rwild)) => lwild == rwild,
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(&PatIdent(ref lmode, ref lident, Option::None), &PatIdent(ref rmode, ref rident, Option::None)) =>
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(&PatIdent(ref lmode, ref lident, Option::None),
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&PatIdent(ref rmode, ref rident, Option::None)) =>
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lmode == rmode && is_ident_equal(&lident.node, &rident.node),
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(&PatIdent(ref lmode, ref lident, Option::Some(ref lpat)),
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&PatIdent(ref rmode, ref rident, Option::Some(ref rpat))) =>
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lmode == rmode && is_ident_equal(&lident.node, &rident.node) && is_pat_equal(lpat, rpat),
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(&PatEnum(ref lpath, Option::None), &PatEnum(ref rpath, Option::None)) => is_path_equal(lpath, rpath),
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(&PatEnum(ref lpath, Option::Some(ref lenum)), &PatEnum(ref rpath, Option::Some(ref renum))) =>
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is_path_equal(lpath, rpath) && is_pat_vec_equal(lenum, renum),
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(&PatStruct(ref lpath, ref lfieldpat, lbool), &PatStruct(ref rpath, ref rfieldpat, rbool)) =>
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lbool == rbool && is_path_equal(lpath, rpath) && is_spanned_fieldpat_vec_equal(lfieldpat, rfieldpat),
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(&PatTup(ref ltup), &PatTup(ref rtup)) => is_pat_vec_equal(ltup, rtup),
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lmode == rmode && is_ident_equal(&lident.node, &rident.node) &&
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is_pat_equal(lpat, rpat),
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(&PatEnum(ref lpath, Option::None), &PatEnum(ref rpath, Option::None)) =>
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is_path_equal(lpath, rpath),
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(&PatEnum(ref lpath, Option::Some(ref lenum)),
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&PatEnum(ref rpath, Option::Some(ref renum))) =>
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is_path_equal(lpath, rpath) && is_pats_equal(lenum, renum),
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(&PatStruct(ref lpath, ref lfieldpat, lbool),
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&PatStruct(ref rpath, ref rfieldpat, rbool)) =>
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lbool == rbool && is_path_equal(lpath, rpath) &&
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is_spanned_fieldpats_equal(lfieldpat, rfieldpat),
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(&PatTup(ref ltup), &PatTup(ref rtup)) => is_pats_equal(ltup, rtup),
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(&PatBox(ref lboxed), &PatBox(ref rboxed)) => is_pat_equal(lboxed, rboxed),
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(&PatRegion(ref lpat, ref lmut), &PatRegion(ref rpat, ref rmut)) => is_pat_equal(lpat, rpat) && lmut == rmut,
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(&PatRegion(ref lpat, ref lmut), &PatRegion(ref rpat, ref rmut)) =>
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is_pat_equal(lpat, rpat) && lmut == rmut,
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(&PatLit(ref llit), &PatLit(ref rlit)) => is_exp_equal(llit, rlit),
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(&PatRange(ref lfrom, ref lto), &PatRange(ref rfrom, ref rto)) =>
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is_exp_equal(lfrom, rfrom) && is_exp_equal(lto, rto),
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(&PatVec(ref lfirst, Option::None, ref llast), &PatVec(ref rfirst, Option::None, ref rlast)) =>
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is_pat_vec_equal(lfirst, rfirst) && is_pat_vec_equal(llast, rlast),
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(&PatVec(ref lfirst, Option::Some(ref lpat), ref llast), &PatVec(ref rfirst, Option::Some(ref rpat), ref rlast)) =>
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is_pat_vec_equal(lfirst, rfirst) && is_pat_equal(lpat, rpat) && is_pat_vec_equal(llast, rlast),
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(&PatVec(ref lfirst, Option::None, ref llast),
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&PatVec(ref rfirst, Option::None, ref rlast)) =>
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is_pats_equal(lfirst, rfirst) && is_pats_equal(llast, rlast),
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(&PatVec(ref lfirst, Option::Some(ref lpat), ref llast),
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&PatVec(ref rfirst, Option::Some(ref rpat), ref rlast)) =>
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is_pats_equal(lfirst, rfirst) && is_pat_equal(lpat, rpat) &&
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is_pats_equal(llast, rlast),
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// I don't match macros for now, the code is slow enough as is ;-)
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_ => false
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}
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}
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fn is_spanned_fieldpat_vec_equal(left : &Vec<code::Spanned<FieldPat>>, right : &Vec<code::Spanned<FieldPat>>) -> bool {
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fn is_spanned_fieldpats_equal(left : &[code::Spanned<FieldPat>],
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right : &[code::Spanned<FieldPat>]) -> bool {
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over(left, right, |l, r| is_fieldpat_equal(&l.node, &r.node))
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}
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fn is_fieldpat_equal(left : &FieldPat, right : &FieldPat) -> bool {
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left.is_shorthand == right.is_shorthand && is_ident_equal(&left.ident, &right.ident) &&
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left.is_shorthand == right.is_shorthand &&
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is_ident_equal(&left.ident, &right.ident) &&
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is_pat_equal(&left.pat, &right.pat)
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}
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@ -178,15 +208,16 @@ fn is_ident_equal(left : &Ident, right : &Ident) -> bool {
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&left.name == &right.name && left.ctxt == right.ctxt
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}
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fn is_pat_vec_equal(left : &Vec<P<Pat>>, right : &Vec<P<Pat>>) -> bool {
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fn is_pats_equal(left : &[P<Pat>], right : &[P<Pat>]) -> bool {
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over(left, right, |l, r| is_pat_equal(l, r))
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}
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fn is_lifetimedef_equal(left : &LifetimeDef, right : &LifetimeDef) -> bool {
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is_lifetime_equal(&left.lifetime, &right.lifetime) && over(&left.bounds, &right.bounds, is_lifetime_equal)
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is_lifetime_equal(&left.lifetime, &right.lifetime) &&
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over(&left.bounds, &right.bounds, is_lifetime_equal)
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}
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fn is_lifetimedef_vec_equal(left : &Vec<LifetimeDef>, right : &Vec<LifetimeDef>) -> bool {
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fn is_lifetimedefs_equal(left : &[LifetimeDef], right : &[LifetimeDef]) -> bool {
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over(left, right, is_lifetimedef_equal)
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}
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@ -194,21 +225,25 @@ fn is_lifetime_equal(left : &Lifetime, right : &Lifetime) -> bool {
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left.name == right.name
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}
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fn is_ty_vec_equal(left : &Vec<P<Ty>>, right : &Vec<P<Ty>>) -> bool {
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fn is_tys_equal(left : &[P<Ty>], right : &[P<Ty>]) -> bool {
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over(left, right, |l, r| is_ty_equal(l, r))
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}
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fn over<X, F>(left: &[X], right: &[X], mut eq_fn: F) -> bool where F: FnMut(&X, &X) -> bool {
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fn over<X, F>(left: &[X], right: &[X], mut eq_fn: F) -> bool
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where F: FnMut(&X, &X) -> bool {
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left.len() == right.len() && left.iter().zip(right).all(|(x, y)| eq_fn(x, y))
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}
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fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn : F) -> bool where F: FnMut(&X, &X) -> bool {
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if l.is_none() { r.is_none() } else { r.is_some() && eq_fn(l.as_ref().unwrap(), &r.as_ref().unwrap()) }
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fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn : F) -> bool
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where F: FnMut(&X, &X) -> bool {
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l.as_ref().map(|x| r.as_ref().map(|y| eq_fn(x, y)).unwrap_or(false))
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.unwrap_or_else(|| r.is_none())
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}
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fn is_cmp_or_bit(op : &BinOp) -> bool {
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match op.node {
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BiEq | BiLt | BiLe | BiGt | BiGe | BiNe | BiAnd | BiOr | BiBitXor | BiBitAnd | BiBitOr => true,
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BiEq | BiLt | BiLe | BiGt | BiGe | BiNe | BiAnd | BiOr | BiBitXor |
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BiBitAnd | BiBitOr => true,
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_ => false
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}
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}
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@ -239,7 +239,7 @@ fn check_to_owned(cx: &Context, expr: &Expr, other_span: Span) {
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let name = ident.as_str();
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if name == "to_string" || name == "to_owned" {
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cx.span_lint(CMP_OWNED, expr.span, &format!(
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"this creates an owned instance just for comparison.
|
||||
"this creates an owned instance just for comparison. \
|
||||
Consider using {}.as_slice() to compare without allocation",
|
||||
cx.sess().codemap().span_to_snippet(other_span).unwrap_or(
|
||||
"..".to_string())))
|
||||
|
|
@ -250,7 +250,7 @@ fn check_to_owned(cx: &Context, expr: &Expr, other_span: Span) {
|
|||
if path.segments.iter().zip(["String", "from_str"].iter()).all(
|
||||
|(seg, name)| &seg.identifier.as_str() == name) {
|
||||
cx.span_lint(CMP_OWNED, expr.span, &format!(
|
||||
"this creates an owned instance just for comparison.
|
||||
"this creates an owned instance just for comparison. \
|
||||
Consider using {}.as_slice() to compare without allocation",
|
||||
cx.sess().codemap().span_to_snippet(other_span).unwrap_or(
|
||||
"..".to_string())))
|
||||
|
|
|
|||
|
|
@ -24,23 +24,24 @@ impl LintPass for MutMut {
|
|||
}
|
||||
|
||||
unwrap_addr(expr).map(|e| {
|
||||
if unwrap_addr(e).is_some() {
|
||||
unwrap_addr(e).map(|_| {
|
||||
cx.span_lint(MUT_MUT, expr.span,
|
||||
"Generally you want to avoid &mut &mut _ if possible.")
|
||||
} else {
|
||||
if let ty_rptr(_, mt{ty: _, mutbl: MutMutable}) = expr_ty(cx.tcx, e).sty {
|
||||
}).unwrap_or_else(|| {
|
||||
if let ty_rptr(_, mt{ty: _, mutbl: MutMutable}) =
|
||||
expr_ty(cx.tcx, e).sty {
|
||||
cx.span_lint(MUT_MUT, expr.span,
|
||||
"This expression mutably borrows a mutable reference. Consider reborrowing")
|
||||
"This expression mutably borrows a mutable reference. \
|
||||
Consider reborrowing")
|
||||
}
|
||||
}
|
||||
});
|
||||
})
|
||||
}).unwrap_or(())
|
||||
}
|
||||
|
||||
fn check_ty(&mut self, cx: &Context, ty: &Ty) {
|
||||
if unwrap_mut(ty).and_then(unwrap_mut).is_some() {
|
||||
cx.span_lint(MUT_MUT, ty.span,
|
||||
"Generally you want to avoid &mut &mut _ if possible.")
|
||||
}
|
||||
unwrap_mut(ty).and_then(unwrap_mut).map(|_| cx.span_lint(MUT_MUT,
|
||||
ty.span, "Generally you want to avoid &mut &mut _ if possible.")).
|
||||
unwrap_or(())
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ declare_lint! {
|
|||
"Warn on declaration of a &Vec- or &String-typed method argument"
|
||||
}
|
||||
|
||||
|
||||
#[derive(Copy,Clone)]
|
||||
pub struct PtrArg;
|
||||
|
||||
|
|
@ -58,12 +57,13 @@ fn check_fn(cx: &Context, decl: &FnDecl) {
|
|||
}
|
||||
|
||||
fn check_ptr_subtype(cx: &Context, span: Span, ty: &Ty) {
|
||||
if match_ty_unwrap(ty, &["Vec"]).is_some() {
|
||||
cx.span_lint(PTR_ARG, span,
|
||||
"Writing '&Vec<_>' instead of '&[_]' involves one more reference and cannot be used with non-vec-based slices. Consider changing the type to &[...]");
|
||||
} else { if match_ty_unwrap(ty, &["String"]).is_some() {
|
||||
cx.span_lint(PTR_ARG, span,
|
||||
"Writing '&String' instead of '&str' involves a new Object where a slices will do. Consider changing the type to &str");
|
||||
}
|
||||
}
|
||||
match_ty_unwrap(ty, &["Vec"]).map(|_| {
|
||||
cx.span_lint(PTR_ARG, span, "Writing '&Vec<_>' instead of '&[_]' \
|
||||
involves one more reference and cannot be used with non-vec-based \
|
||||
slices. Consider changing the type to &[...]")
|
||||
}).unwrap_or_else(|| match_ty_unwrap(ty, &["String"]).map(|_| {
|
||||
cx.span_lint(PTR_ARG, span,
|
||||
"Writing '&String' instead of '&str' involves a new Object \
|
||||
where a slices will do. Consider changing the type to &str")
|
||||
}).unwrap_or(()));
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue