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Merge pull request #609 from oli-obk/prefixed_enum_variants

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lint against enums where all variants share a prefix/postfix
This commit is contained in:
llogiq 2016-02-01 20:36:18 +01:00
commit 1dd19fbae3
13 changed files with 305 additions and 217 deletions
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3
README.md
View file

@ -6,7 +6,7 @@ A collection of lints to catch common mistakes and improve your Rust code.
[Jump to usage instructions](#usage)
##Lints
There are 105 lints included in this crate:
There are 106 lints included in this crate:
name | default | meaning
---------------------------------------------------------------------------------------------------------------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
@ -30,6 +30,7 @@ name
[derive_hash_not_eq](https://github.com/Manishearth/rust-clippy/wiki#derive_hash_not_eq) | warn | deriving `Hash` but implementing `PartialEq` explicitly
[duplicate_underscore_argument](https://github.com/Manishearth/rust-clippy/wiki#duplicate_underscore_argument) | warn | Function arguments having names which only differ by an underscore
[empty_loop](https://github.com/Manishearth/rust-clippy/wiki#empty_loop) | warn | empty `loop {}` detected
[enum_variant_names](https://github.com/Manishearth/rust-clippy/wiki#enum_variant_names) | warn | finds enums where all variants share a prefix/postfix
[eq_op](https://github.com/Manishearth/rust-clippy/wiki#eq_op) | warn | equal operands on both sides of a comparison or bitwise combination (e.g. `x == x`)
[expl_impl_clone_on_copy](https://github.com/Manishearth/rust-clippy/wiki#expl_impl_clone_on_copy) | warn | implementing `Clone` explicitly on `Copy` types
[explicit_counter_loop](https://github.com/Manishearth/rust-clippy/wiki#explicit_counter_loop) | warn | for-looping with an explicit counter when `_.enumerate()` would do

167
src/consts.rs
View file

@ -12,7 +12,6 @@ use std::cmp::Ordering::{self, Greater, Less, Equal};
use std::rc::Rc;
use std::ops::Deref;
use std::fmt;
use self::Constant::*;
use self::FloatWidth::*;
use syntax::ast::Lit_::*;
@ -44,25 +43,25 @@ impl From<FloatTy> for FloatWidth {
#[derive(Eq, Debug, Clone)]
pub enum Constant {
/// a String "abc"
ConstantStr(String, StrStyle),
Str(String, StrStyle),
/// a Binary String b"abc"
ConstantBinary(Rc<Vec<u8>>),
Binary(Rc<Vec<u8>>),
/// a single byte b'a'
ConstantByte(u8),
Byte(u8),
/// a single char 'a'
ConstantChar(char),
Char(char),
/// an integer
ConstantInt(u64, LitIntType),
Int(u64, LitIntType),
/// a float with given type
ConstantFloat(String, FloatWidth),
Float(String, FloatWidth),
/// true or false
ConstantBool(bool),
Bool(bool),
/// an array of constants
ConstantVec(Vec<Constant>),
Vec(Vec<Constant>),
/// also an array, but with only one constant, repeated N times
ConstantRepeat(Box<Constant>, usize),
Repeat(Box<Constant>, usize),
/// a tuple of constants
ConstantTuple(Vec<Constant>),
Tuple(Vec<Constant>),
}
impl Constant {
@ -72,7 +71,7 @@ impl Constant {
///
/// if the constant could not be converted to u64 losslessly
fn as_u64(&self) -> u64 {
if let ConstantInt(val, _) = *self {
if let Constant::Int(val, _) = *self {
val // TODO we may want to check the sign if any
} else {
panic!("Could not convert a {:?} to u64", self);
@ -83,9 +82,9 @@ impl Constant {
#[allow(cast_precision_loss)]
pub fn as_float(&self) -> Option<f64> {
match *self {
ConstantByte(b) => Some(b as f64),
ConstantFloat(ref s, _) => s.parse().ok(),
ConstantInt(i, ty) => {
Constant::Byte(b) => Some(b as f64),
Constant::Float(ref s, _) => s.parse().ok(),
Constant::Int(i, ty) => {
Some(if is_negative(ty) {
-(i as f64)
} else {
@ -100,14 +99,14 @@ impl Constant {
impl PartialEq for Constant {
fn eq(&self, other: &Constant) -> bool {
match (self, other) {
(&ConstantStr(ref ls, ref lsty), &ConstantStr(ref rs, ref rsty)) => ls == rs && lsty == rsty,
(&ConstantBinary(ref l), &ConstantBinary(ref r)) => l == r,
(&ConstantByte(l), &ConstantByte(r)) => l == r,
(&ConstantChar(l), &ConstantChar(r)) => l == r,
(&ConstantInt(lv, lty), &ConstantInt(rv, rty)) => {
(&Constant::Str(ref ls, ref lsty), &Constant::Str(ref rs, ref rsty)) => ls == rs && lsty == rsty,
(&Constant::Binary(ref l), &Constant::Binary(ref r)) => l == r,
(&Constant::Byte(l), &Constant::Byte(r)) => l == r,
(&Constant::Char(l), &Constant::Char(r)) => l == r,
(&Constant::Int(lv, lty), &Constant::Int(rv, rty)) => {
lv == rv && (is_negative(lty) & (lv != 0)) == (is_negative(rty) & (rv != 0))
}
(&ConstantFloat(ref ls, lw), &ConstantFloat(ref rs, rw)) => {
(&Constant::Float(ref ls, lw), &Constant::Float(ref rs, rw)) => {
if match (lw, rw) {
(FwAny, _) | (_, FwAny) | (Fw32, Fw32) | (Fw64, Fw64) => true,
_ => false,
@ -120,10 +119,10 @@ impl PartialEq for Constant {
false
}
}
(&ConstantBool(l), &ConstantBool(r)) => l == r,
(&ConstantVec(ref l), &ConstantVec(ref r)) => l == r,
(&ConstantRepeat(ref lv, ref ls), &ConstantRepeat(ref rv, ref rs)) => ls == rs && lv == rv,
(&ConstantTuple(ref l), &ConstantTuple(ref r)) => l == r,
(&Constant::Bool(l), &Constant::Bool(r)) => l == r,
(&Constant::Vec(ref l), &Constant::Vec(ref r)) => l == r,
(&Constant::Repeat(ref lv, ref ls), &Constant::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
(&Constant::Tuple(ref l), &Constant::Tuple(ref r)) => l == r,
_ => false, //TODO: Are there inter-type equalities?
}
}
@ -132,16 +131,16 @@ impl PartialEq for Constant {
impl PartialOrd for Constant {
fn partial_cmp(&self, other: &Constant) -> Option<Ordering> {
match (self, other) {
(&ConstantStr(ref ls, ref lsty), &ConstantStr(ref rs, ref rsty)) => {
(&Constant::Str(ref ls, ref lsty), &Constant::Str(ref rs, ref rsty)) => {
if lsty != rsty {
None
} else {
Some(ls.cmp(rs))
}
}
(&ConstantByte(ref l), &ConstantByte(ref r)) => Some(l.cmp(r)),
(&ConstantChar(ref l), &ConstantChar(ref r)) => Some(l.cmp(r)),
(&ConstantInt(ref lv, lty), &ConstantInt(ref rv, rty)) => {
(&Constant::Byte(ref l), &Constant::Byte(ref r)) => Some(l.cmp(r)),
(&Constant::Char(ref l), &Constant::Char(ref r)) => Some(l.cmp(r)),
(&Constant::Int(ref lv, lty), &Constant::Int(ref rv, rty)) => {
Some(match (is_negative(lty) && *lv != 0, is_negative(rty) && *rv != 0) {
(true, true) => rv.cmp(lv),
(false, false) => lv.cmp(rv),
@ -149,7 +148,7 @@ impl PartialOrd for Constant {
(false, true) => Greater,
})
}
(&ConstantFloat(ref ls, lw), &ConstantFloat(ref rs, rw)) => {
(&Constant::Float(ref ls, lw), &Constant::Float(ref rs, rw)) => {
if match (lw, rw) {
(FwAny, _) | (_, FwAny) | (Fw32, Fw32) | (Fw64, Fw64) => true,
_ => false,
@ -162,15 +161,15 @@ impl PartialOrd for Constant {
None
}
}
(&ConstantBool(ref l), &ConstantBool(ref r)) => Some(l.cmp(r)),
(&ConstantVec(ref l), &ConstantVec(ref r)) => l.partial_cmp(&r),
(&ConstantRepeat(ref lv, ref ls), &ConstantRepeat(ref rv, ref rs)) => {
(&Constant::Bool(ref l), &Constant::Bool(ref r)) => Some(l.cmp(r)),
(&Constant::Vec(ref l), &Constant::Vec(ref r)) => l.partial_cmp(&r),
(&Constant::Repeat(ref lv, ref ls), &Constant::Repeat(ref rv, ref rs)) => {
match lv.partial_cmp(rv) {
Some(Equal) => Some(ls.cmp(rs)),
x => x,
}
}
(&ConstantTuple(ref l), &ConstantTuple(ref r)) => l.partial_cmp(r),
(&Constant::Tuple(ref l), &Constant::Tuple(ref r)) => l.partial_cmp(r),
_ => None, //TODO: Are there any useful inter-type orderings?
}
}
@ -193,21 +192,21 @@ fn format_byte(fmt: &mut fmt::Formatter, b: u8) -> fmt::Result {
impl fmt::Display for Constant {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
ConstantStr(ref s, _) => write!(fmt, "{:?}", s),
ConstantByte(ref b) => {
Constant::Str(ref s, _) => write!(fmt, "{:?}", s),
Constant::Byte(ref b) => {
write!(fmt, "b'")
.and_then(|_| format_byte(fmt, *b))
.and_then(|_| write!(fmt, "'"))
}
ConstantBinary(ref bs) => {
Constant::Binary(ref bs) => {
try!(write!(fmt, "b\""));
for b in bs.iter() {
try!(format_byte(fmt, *b));
}
write!(fmt, "\"")
}
ConstantChar(ref c) => write!(fmt, "'{}'", c),
ConstantInt(ref i, ref ity) => {
Constant::Char(ref c) => write!(fmt, "'{}'", c),
Constant::Int(ref i, ref ity) => {
let (sign, suffix) = match *ity {
LitIntType::SignedIntLit(ref sity, ref sign) => {
(if let Sign::Minus = *sign {
@ -229,7 +228,7 @@ impl fmt::Display for Constant {
};
write!(fmt, "{}{}{}", sign, i, suffix)
}
ConstantFloat(ref s, ref fw) => {
Constant::Float(ref s, ref fw) => {
let suffix = match *fw {
FloatWidth::Fw32 => "f32",
FloatWidth::Fw64 => "f64",
@ -237,9 +236,9 @@ impl fmt::Display for Constant {
};
write!(fmt, "{}{}", s, suffix)
}
ConstantBool(ref b) => write!(fmt, "{}", b),
ConstantRepeat(ref c, ref n) => write!(fmt, "[{}; {}]", c, n),
ConstantVec(ref v) => {
Constant::Bool(ref b) => write!(fmt, "{}", b),
Constant::Repeat(ref c, ref n) => write!(fmt, "[{}; {}]", c, n),
Constant::Vec(ref v) => {
write!(fmt,
"[{}]",
v.iter()
@ -247,7 +246,7 @@ impl fmt::Display for Constant {
.collect::<Vec<_>>()
.join(", "))
}
ConstantTuple(ref t) => {
Constant::Tuple(ref t) => {
write!(fmt,
"({})",
t.iter()
@ -262,21 +261,21 @@ impl fmt::Display for Constant {
fn lit_to_constant(lit: &Lit_) -> Constant {
match *lit {
LitStr(ref is, style) => ConstantStr(is.to_string(), style),
LitByte(b) => ConstantByte(b),
LitByteStr(ref s) => ConstantBinary(s.clone()),
LitChar(c) => ConstantChar(c),
LitInt(value, ty) => ConstantInt(value, ty),
LitFloat(ref is, ty) => ConstantFloat(is.to_string(), ty.into()),
LitFloatUnsuffixed(ref is) => ConstantFloat(is.to_string(), FwAny),
LitBool(b) => ConstantBool(b),
LitStr(ref is, style) => Constant::Str(is.to_string(), style),
LitByte(b) => Constant::Byte(b),
LitByteStr(ref s) => Constant::Binary(s.clone()),
LitChar(c) => Constant::Char(c),
LitInt(value, ty) => Constant::Int(value, ty),
LitFloat(ref is, ty) => Constant::Float(is.to_string(), ty.into()),
LitFloatUnsuffixed(ref is) => Constant::Float(is.to_string(), FwAny),
LitBool(b) => Constant::Bool(b),
}
}
fn constant_not(o: Constant) -> Option<Constant> {
Some(match o {
ConstantBool(b) => ConstantBool(!b),
ConstantInt(value, ty) => {
Constant::Bool(b) => Constant::Bool(!b),
Constant::Int(value, ty) => {
let (nvalue, nty) = match ty {
SignedIntLit(ity, Plus) => {
if value == ::std::u64::MAX {
@ -307,7 +306,7 @@ fn constant_not(o: Constant) -> Option<Constant> {
return None;
} // refuse to guess
};
ConstantInt(nvalue, nty)
Constant::Int(nvalue, nty)
}
_ => {
return None;
@ -317,8 +316,8 @@ fn constant_not(o: Constant) -> Option<Constant> {
fn constant_negate(o: Constant) -> Option<Constant> {
Some(match o {
ConstantInt(value, ty) => {
ConstantInt(value,
Constant::Int(value, ty) => {
Constant::Int(value,
match ty {
SignedIntLit(ity, sign) => SignedIntLit(ity, neg_sign(sign)),
UnsuffixedIntLit(sign) => UnsuffixedIntLit(neg_sign(sign)),
@ -327,7 +326,7 @@ fn constant_negate(o: Constant) -> Option<Constant> {
}
})
}
ConstantFloat(is, ty) => ConstantFloat(neg_float_str(is), ty),
Constant::Float(is, ty) => Constant::Float(neg_float_str(is), ty),
_ => {
return None;
}
@ -402,9 +401,9 @@ fn unify_int_type(l: LitIntType, r: LitIntType, s: Sign) -> Option<LitIntType> {
fn add_neg_int(pos: u64, pty: LitIntType, neg: u64, nty: LitIntType) -> Option<Constant> {
if neg > pos {
unify_int_type(nty, pty, Minus).map(|ty| ConstantInt(neg - pos, ty))
unify_int_type(nty, pty, Minus).map(|ty| Constant::Int(neg - pos, ty))
} else {
unify_int_type(nty, pty, Plus).map(|ty| ConstantInt(pos - neg, ty))
unify_int_type(nty, pty, Plus).map(|ty| Constant::Int(pos - neg, ty))
}
}
@ -416,7 +415,7 @@ fn sub_int(l: u64, lty: LitIntType, r: u64, rty: LitIntType, neg: bool) -> Optio
} else {
Plus
})
.and_then(|ty| l.checked_sub(r).map(|v| ConstantInt(v, ty)))
.and_then(|ty| l.checked_sub(r).map(|v| Constant::Int(v, ty)))
}
@ -449,10 +448,10 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
ExprBlock(ref block) => self.block(block),
ExprIf(ref cond, ref then, ref otherwise) => self.ifthenelse(cond, then, otherwise),
ExprLit(ref lit) => Some(lit_to_constant(&lit.node)),
ExprVec(ref vec) => self.multi(vec).map(ConstantVec),
ExprTup(ref tup) => self.multi(tup).map(ConstantTuple),
ExprVec(ref vec) => self.multi(vec).map(Constant::Vec),
ExprTup(ref tup) => self.multi(tup).map(Constant::Tuple),
ExprRepeat(ref value, ref number) => {
self.binop_apply(value, number, |v, n| Some(ConstantRepeat(Box::new(v), n.as_u64() as usize)))
self.binop_apply(value, number, |v, n| Some(Constant::Repeat(Box::new(v), n.as_u64() as usize)))
}
ExprUnary(op, ref operand) => {
self.expr(operand).and_then(|o| {
@ -508,7 +507,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
}
fn ifthenelse(&mut self, cond: &Expr, then: &Block, otherwise: &Option<P<Expr>>) -> Option<Constant> {
if let Some(ConstantBool(b)) = self.expr(cond) {
if let Some(Constant::Bool(b)) = self.expr(cond) {
if b {
self.block(then)
} else {
@ -524,8 +523,8 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
BiAdd => {
self.binop_apply(left, right, |l, r| {
match (l, r) {
(ConstantByte(l8), ConstantByte(r8)) => l8.checked_add(r8).map(ConstantByte),
(ConstantInt(l64, lty), ConstantInt(r64, rty)) => {
(Constant::Byte(l8), Constant::Byte(r8)) => l8.checked_add(r8).map(Constant::Byte),
(Constant::Int(l64, lty), Constant::Int(r64, rty)) => {
let (ln, rn) = (is_negative(lty), is_negative(rty));
if ln == rn {
unify_int_type(lty,
@ -535,7 +534,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
} else {
Plus
})
.and_then(|ty| l64.checked_add(r64).map(|v| ConstantInt(v, ty)))
.and_then(|ty| l64.checked_add(r64).map(|v| Constant::Int(v, ty)))
} else if ln {
add_neg_int(r64, rty, l64, lty)
} else {
@ -550,24 +549,24 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
BiSub => {
self.binop_apply(left, right, |l, r| {
match (l, r) {
(ConstantByte(l8), ConstantByte(r8)) => {
(Constant::Byte(l8), Constant::Byte(r8)) => {
if r8 > l8 {
None
} else {
Some(ConstantByte(l8 - r8))
Some(Constant::Byte(l8 - r8))
}
}
(ConstantInt(l64, lty), ConstantInt(r64, rty)) => {
(Constant::Int(l64, lty), Constant::Int(r64, rty)) => {
match (is_negative(lty), is_negative(rty)) {
(false, false) => sub_int(l64, lty, r64, rty, r64 > l64),
(true, true) => sub_int(l64, lty, r64, rty, l64 > r64),
(true, false) => {
unify_int_type(lty, rty, Minus)
.and_then(|ty| l64.checked_add(r64).map(|v| ConstantInt(v, ty)))
.and_then(|ty| l64.checked_add(r64).map(|v| Constant::Int(v, ty)))
}
(false, true) => {
unify_int_type(lty, rty, Plus)
.and_then(|ty| l64.checked_add(r64).map(|v| ConstantInt(v, ty)))
.and_then(|ty| l64.checked_add(r64).map(|v| Constant::Int(v, ty)))
}
}
}
@ -585,8 +584,8 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
BiBitOr => self.bitop(left, right, |x, y| (x | y)),
BiShl => self.bitop(left, right, |x, y| x << y),
BiShr => self.bitop(left, right, |x, y| x >> y),
BiEq => self.binop_apply(left, right, |l, r| Some(ConstantBool(l == r))),
BiNe => self.binop_apply(left, right, |l, r| Some(ConstantBool(l != r))),
BiEq => self.binop_apply(left, right, |l, r| Some(Constant::Bool(l == r))),
BiNe => self.binop_apply(left, right, |l, r| Some(Constant::Bool(l != r))),
BiLt => self.cmp(left, right, Less, true),
BiLe => self.cmp(left, right, Greater, false),
BiGe => self.cmp(left, right, Less, false),
@ -600,7 +599,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
{
self.binop_apply(left, right, |l, r| {
match (l, r) {
(ConstantInt(l64, lty), ConstantInt(r64, rty)) => {
(Constant::Int(l64, lty), Constant::Int(r64, rty)) => {
f(l64, r64).and_then(|value| {
unify_int_type(lty,
rty,
@ -609,7 +608,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
} else {
Minus
})
.map(|ty| ConstantInt(value, ty))
.map(|ty| Constant::Int(value, ty))
})
}
_ => None,
@ -622,10 +621,10 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
{
self.binop_apply(left, right, |l, r| {
match (l, r) {
(ConstantBool(l), ConstantBool(r)) => Some(ConstantBool(f(l as u64, r as u64) != 0)),
(ConstantByte(l8), ConstantByte(r8)) => Some(ConstantByte(f(l8 as u64, r8 as u64) as u8)),
(ConstantInt(l, lty), ConstantInt(r, rty)) => {
unify_int_type(lty, rty, Plus).map(|ty| ConstantInt(f(l, r), ty))
(Constant::Bool(l), Constant::Bool(r)) => Some(Constant::Bool(f(l as u64, r as u64) != 0)),
(Constant::Byte(l8), Constant::Byte(r8)) => Some(Constant::Byte(f(l8 as u64, r8 as u64) as u8)),
(Constant::Int(l, lty), Constant::Int(r, rty)) => {
unify_int_type(lty, rty, Plus).map(|ty| Constant::Int(f(l, r), ty))
}
_ => None,
}
@ -635,7 +634,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
fn cmp(&mut self, left: &Expr, right: &Expr, ordering: Ordering, b: bool) -> Option<Constant> {
self.binop_apply(left,
right,
|l, r| l.partial_cmp(&r).map(|o| ConstantBool(b == (o == ordering))))
|l, r| l.partial_cmp(&r).map(|o| Constant::Bool(b == (o == ordering))))
}
fn binop_apply<F>(&mut self, left: &Expr, right: &Expr, op: F) -> Option<Constant>
@ -650,12 +649,12 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
fn short_circuit(&mut self, left: &Expr, right: &Expr, b: bool) -> Option<Constant> {
self.expr(left).and_then(|left| {
if let ConstantBool(lbool) = left {
if let Constant::Bool(lbool) = left {
if lbool == b {
Some(left)
} else {
self.expr(right).and_then(|right| {
if let ConstantBool(_) = right {
if let Constant::Bool(_) = right {
Some(right)
} else {
None

90
src/enum_variants.rs Normal file
View file

@ -0,0 +1,90 @@
//! lint on enum variants that are prefixed or suffixed by the same characters
use rustc::lint::*;
use syntax::attr::*;
use syntax::ast::*;
use syntax::parse::token::InternedString;
use utils::span_help_and_lint;
/// **What it does:** Warns on enum variants that are prefixed or suffixed by the same characters
///
/// **Why is this bad?** Enum variant names should specify their variant, not the enum, too.
///
/// **Known problems:** None
///
/// **Example:** enum Cake { BlackForestCake, HummingbirdCake }
declare_lint! { pub ENUM_VARIANT_NAMES, Warn,
"finds enums where all variants share a prefix/postfix" }
pub struct EnumVariantNames;
impl LintPass for EnumVariantNames {
fn get_lints(&self) -> LintArray {
lint_array!(ENUM_VARIANT_NAMES)
}
}
fn var2str(var: &Variant) -> InternedString {
var.node.name.name.as_str()
}
fn partial_match(left: &str, right: &str) -> usize {
left.chars().zip(right.chars()).take_while(|&(l, r)| l == r).count()
}
fn partial_rmatch(left: &str, right: &str) -> usize {
left.chars().rev().zip(right.chars().rev()).take_while(|&(l, r)| l == r).count()
}
impl EarlyLintPass for EnumVariantNames {
fn check_item(&mut self, cx: &EarlyContext, item: &Item) {
if let ItemEnum(ref def, _) = item.node {
if def.variants.len() < 2 {
return;
}
let first = var2str(&*def.variants[0]);
let mut pre = first.to_string();
let mut post = pre.clone();
for var in &def.variants[1..] {
let name = var2str(var);
let pre_match = partial_match(&pre, &name);
let post_match = partial_rmatch(&post, &name);
pre.truncate(pre_match);
let post_end = post.len() - post_match;
post.drain(..post_end);
}
if let Some(c) = first[pre.len()..].chars().next() {
if !c.is_uppercase() {
// non camel case prefix
pre.clear()
}
}
if let Some(c) = first[..(first.len() - post.len())].chars().rev().next() {
if let Some(c1) = post.chars().next() {
if !c.is_lowercase() || !c1.is_uppercase() {
// non camel case postfix
post.clear()
}
}
}
if pre == "_" {
// don't lint on underscores which are meant to allow dead code
pre.clear();
}
let (what, value) = if !pre.is_empty() {
("pre", pre)
} else if !post.is_empty() {
("post", post)
} else {
return
};
span_help_and_lint(cx,
ENUM_VARIANT_NAMES,
item.span,
&format!("All variants have the same {}fix: `{}`", what, value),
&format!("remove the {}fixes and use full paths to \
the variants instead of glob imports", what));
}
}
}

5
src/identity_op.rs
View file

@ -2,8 +2,7 @@ use rustc::lint::*;
use rustc_front::hir::*;
use syntax::codemap::Span;
use consts::{constant_simple, is_negative};
use consts::Constant::ConstantInt;
use consts::{constant_simple, is_negative, Constant};
use utils::{span_lint, snippet, in_macro};
/// **What it does:** This lint checks for identity operations, e.g. `x + 0`. It is `Warn` by default.
@ -54,7 +53,7 @@ impl LateLintPass for IdentityOp {
fn check(cx: &LateContext, e: &Expr, m: i8, span: Span, arg: Span) {
if let Some(ConstantInt(v, ty)) = constant_simple(e) {
if let Some(Constant::Int(v, ty)) = constant_simple(e) {
if match m {
0 => v == 0,
-1 => is_negative(ty) && v == 1,

3
src/lib.rs
View file

@ -43,6 +43,7 @@ pub mod ptr_arg;
pub mod needless_bool;
pub mod approx_const;
pub mod eta_reduction;
pub mod enum_variants;
pub mod identity_op;
pub mod items_after_statements;
pub mod minmax;
@ -93,6 +94,7 @@ pub fn plugin_registrar(reg: &mut Registry) {
reg.register_late_lint_pass(box misc::TopLevelRefPass);
reg.register_late_lint_pass(box misc::CmpNan);
reg.register_late_lint_pass(box eq_op::EqOp);
reg.register_early_lint_pass(box enum_variants::EnumVariantNames);
reg.register_late_lint_pass(box bit_mask::BitMask);
reg.register_late_lint_pass(box ptr_arg::PtrArg);
reg.register_late_lint_pass(box needless_bool::NeedlessBool);
@ -183,6 +185,7 @@ pub fn plugin_registrar(reg: &mut Registry) {
derive::DERIVE_HASH_NOT_EQ,
derive::EXPL_IMPL_CLONE_ON_COPY,
entry::MAP_ENTRY,
enum_variants::ENUM_VARIANT_NAMES,
eq_op::EQ_OP,
escape::BOXED_LOCAL,
eta_reduction::REDUNDANT_CLOSURE,

4
src/loops.rs
View file

@ -365,8 +365,8 @@ fn check_for_loop_reverse_range(cx: &LateContext, arg: &Expr, expr: &Expr) {
// if this for loop is iterating over a two-sided range...
if let ExprRange(Some(ref start_expr), Some(ref stop_expr)) = arg.node {
// ...and both sides are compile-time constant integers...
if let Some(start_idx @ Constant::ConstantInt(..)) = constant_simple(start_expr) {
if let Some(stop_idx @ Constant::ConstantInt(..)) = constant_simple(stop_expr) {
if let Some(start_idx @ Constant::Int(..)) = constant_simple(start_expr) {
if let Some(stop_idx @ Constant::Int(..)) = constant_simple(stop_expr) {
// ...and the start index is greater than the stop index,
// this loop will never run. This is often confusing for developers
// who think that this will iterate from the larger value to the

197
src/methods.rs
View file

@ -19,9 +19,6 @@ use utils::{
use utils::MethodArgs;
use rustc::middle::cstore::CrateStore;
use self::SelfKind::*;
use self::OutType::*;
#[derive(Clone)]
pub struct MethodsPass;
@ -456,11 +453,11 @@ fn lint_extend(cx: &LateContext, expr: &Expr, args: &MethodArgs) {
}
}
fn derefs_to_slice(cx: &LateContext, expr: &Expr, ty: &ty::Ty)
fn derefs_to_slice(cx: &LateContext, expr: &Expr, ty: &ty::Ty)
-> Option<(Span, &'static str)> {
fn may_slice(cx: &LateContext, ty: &ty::Ty) -> bool {
match ty.sty {
ty::TySlice(_) => true,
ty::TySlice(_) => true,
ty::TyStruct(..) => match_type(cx, ty, &VEC_PATH),
ty::TyArray(_, size) => size < 32,
ty::TyRef(_, ty::TypeAndMut { ty: ref inner, .. }) |
@ -469,7 +466,7 @@ fn derefs_to_slice(cx: &LateContext, expr: &Expr, ty: &ty::Ty)
}
}
if let ExprMethodCall(name, _, ref args) = expr.node {
if &name.node.as_str() == &"iter" &&
if &name.node.as_str() == &"iter" &&
may_slice(cx, &cx.tcx.expr_ty(&args[0])) {
Some((args[0].span, "&"))
} else {
@ -479,7 +476,7 @@ fn derefs_to_slice(cx: &LateContext, expr: &Expr, ty: &ty::Ty)
match ty.sty {
ty::TySlice(_) => Some((expr.span, "")),
ty::TyRef(_, ty::TypeAndMut { ty: ref inner, .. }) |
ty::TyBox(ref inner) => if may_slice(cx, inner) {
ty::TyBox(ref inner) => if may_slice(cx, inner) {
Some((expr.span, ""))
} else { None },
_ => None
@ -731,180 +728,180 @@ fn has_debug_impl<'a, 'b>(ty: ty::Ty<'a>, cx: &LateContext<'b, 'a>) -> bool {
debug_impl_exists
}
const CONVENTIONS: [(&'static str, &'static [SelfKind]); 5] = [("into_", &[ValueSelf]),
("to_", &[RefSelf]),
("as_", &[RefSelf, RefMutSelf]),
("is_", &[RefSelf, NoSelf]),
("from_", &[NoSelf])];
const CONVENTIONS: [(&'static str, &'static [SelfKind]); 5] = [("into_", &[SelfKind::Value]),
("to_", &[SelfKind::Ref]),
("as_", &[SelfKind::Ref, SelfKind::RefMut]),
("is_", &[SelfKind::Ref, SelfKind::No]),
("from_", &[SelfKind::No])];
const TRAIT_METHODS: [(&'static str, usize, SelfKind, OutType, &'static str); 30] = [("add",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Add"),
("sub",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Sub"),
("mul",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Mul"),
("div",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Div"),
("rem",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Rem"),
("shl",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Shl"),
("shr",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Shr"),
("bitand",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::BitAnd"),
("bitor",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::BitOr"),
("bitxor",
2,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::BitXor"),
("neg",
1,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Neg"),
("not",
1,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::ops::Not"),
("drop",
1,
RefMutSelf,
UnitType,
SelfKind::RefMut,
OutType::Unit,
"std::ops::Drop"),
("index",
2,
RefSelf,
RefType,
SelfKind::Ref,
OutType::Ref,
"std::ops::Index"),
("index_mut",
2,
RefMutSelf,
RefType,
SelfKind::RefMut,
OutType::Ref,
"std::ops::IndexMut"),
("deref",
1,
RefSelf,
RefType,
SelfKind::Ref,
OutType::Ref,
"std::ops::Deref"),
("deref_mut",
1,
RefMutSelf,
RefType,
SelfKind::RefMut,
OutType::Ref,
"std::ops::DerefMut"),
("clone",
1,
RefSelf,
AnyType,
SelfKind::Ref,
OutType::Any,
"std::clone::Clone"),
("borrow",
1,
RefSelf,
RefType,
SelfKind::Ref,
OutType::Ref,
"std::borrow::Borrow"),
("borrow_mut",
1,
RefMutSelf,
RefType,
SelfKind::RefMut,
OutType::Ref,
"std::borrow::BorrowMut"),
("as_ref",
1,
RefSelf,
RefType,
SelfKind::Ref,
OutType::Ref,
"std::convert::AsRef"),
("as_mut",
1,
RefMutSelf,
RefType,
SelfKind::RefMut,
OutType::Ref,
"std::convert::AsMut"),
("eq",
2,
RefSelf,
BoolType,
SelfKind::Ref,
OutType::Bool,
"std::cmp::PartialEq"),
("cmp",
2,
RefSelf,
AnyType,
SelfKind::Ref,
OutType::Any,
"std::cmp::Ord"),
("default",
0,
NoSelf,
AnyType,
SelfKind::No,
OutType::Any,
"std::default::Default"),
("hash",
2,
RefSelf,
UnitType,
SelfKind::Ref,
OutType::Unit,
"std::hash::Hash"),
("next",
1,
RefMutSelf,
AnyType,
SelfKind::RefMut,
OutType::Any,
"std::iter::Iterator"),
("into_iter",
1,
ValueSelf,
AnyType,
SelfKind::Value,
OutType::Any,
"std::iter::IntoIterator"),
("from_iter",
1,
NoSelf,
AnyType,
SelfKind::No,
OutType::Any,
"std::iter::FromIterator"),
("from_str",
1,
NoSelf,
AnyType,
SelfKind::No,
OutType::Any,
"std::str::FromStr")];
#[derive(Clone, Copy)]
enum SelfKind {
ValueSelf,
RefSelf,
RefMutSelf,
NoSelf,
Value,
Ref,
RefMut,
No,
}
impl SelfKind {
fn matches(&self, slf: &ExplicitSelf_, allow_value_for_ref: bool) -> bool {
match (self, slf) {
(&ValueSelf, &SelfValue(_)) => true,
(&RefSelf, &SelfRegion(_, Mutability::MutImmutable, _)) => true,
(&RefMutSelf, &SelfRegion(_, Mutability::MutMutable, _)) => true,
(&RefSelf, &SelfValue(_)) => allow_value_for_ref,
(&RefMutSelf, &SelfValue(_)) => allow_value_for_ref,
(&NoSelf, &SelfStatic) => true,
(&SelfKind::Value, &SelfValue(_)) => true,
(&SelfKind::Ref, &SelfRegion(_, Mutability::MutImmutable, _)) => true,
(&SelfKind::RefMut, &SelfRegion(_, Mutability::MutMutable, _)) => true,
(&SelfKind::Ref, &SelfValue(_)) => allow_value_for_ref,
(&SelfKind::RefMut, &SelfValue(_)) => allow_value_for_ref,
(&SelfKind::No, &SelfStatic) => true,
(_, &SelfExplicit(ref ty, _)) => self.matches_explicit_type(ty, allow_value_for_ref),
_ => false,
}
@ -912,41 +909,41 @@ impl SelfKind {
fn matches_explicit_type(&self, ty: &Ty, allow_value_for_ref: bool) -> bool {
match (self, &ty.node) {
(&ValueSelf, &TyPath(..)) => true,
(&RefSelf, &TyRptr(_, MutTy { mutbl: Mutability::MutImmutable, .. })) => true,
(&RefMutSelf, &TyRptr(_, MutTy { mutbl: Mutability::MutMutable, .. })) => true,
(&RefSelf, &TyPath(..)) => allow_value_for_ref,
(&RefMutSelf, &TyPath(..)) => allow_value_for_ref,
(&SelfKind::Value, &TyPath(..)) => true,
(&SelfKind::Ref, &TyRptr(_, MutTy { mutbl: Mutability::MutImmutable, .. })) => true,
(&SelfKind::RefMut, &TyRptr(_, MutTy { mutbl: Mutability::MutMutable, .. })) => true,
(&SelfKind::Ref, &TyPath(..)) => allow_value_for_ref,
(&SelfKind::RefMut, &TyPath(..)) => allow_value_for_ref,
_ => false,
}
}
fn description(&self) -> &'static str {
match *self {
ValueSelf => "self by value",
RefSelf => "self by reference",
RefMutSelf => "self by mutable reference",
NoSelf => "no self",
SelfKind::Value => "self by value",
SelfKind::Ref => "self by reference",
SelfKind::RefMut => "self by mutable reference",
SelfKind::No => "no self",
}
}
}
#[derive(Clone, Copy)]
enum OutType {
UnitType,
BoolType,
AnyType,
RefType,
Unit,
Bool,
Any,
Ref,
}
impl OutType {
fn matches(&self, ty: &FunctionRetTy) -> bool {
match (self, ty) {
(&UnitType, &DefaultReturn(_)) => true,
(&UnitType, &Return(ref ty)) if ty.node == TyTup(vec![].into()) => true,
(&BoolType, &Return(ref ty)) if is_bool(ty) => true,
(&AnyType, &Return(ref ty)) if ty.node != TyTup(vec![].into()) => true,
(&RefType, &Return(ref ty)) => {
(&OutType::Unit, &DefaultReturn(_)) => true,
(&OutType::Unit, &Return(ref ty)) if ty.node == TyTup(vec![].into()) => true,
(&OutType::Bool, &Return(ref ty)) if is_bool(ty) => true,
(&OutType::Any, &Return(ref ty)) if ty.node != TyTup(vec![].into()) => true,
(&OutType::Ref, &Return(ref ty)) => {
if let TyRptr(_, _) = ty.node {
true
} else {

4
src/zero_div_zero.rs
View file

@ -35,8 +35,8 @@ impl LateLintPass for ZeroDivZeroPass {
// TODO - constant_simple does not fold many operations involving floats.
// That's probably fine for this lint - it's pretty unlikely that someone would
// do something like 0.0/(2.0 - 2.0), but it would be nice to warn on that case too.
let Some(Constant::ConstantFloat(ref lhs_value, lhs_width)) = constant_simple(left),
let Some(Constant::ConstantFloat(ref rhs_value, rhs_width)) = constant_simple(right),
let Some(Constant::Float(ref lhs_value, lhs_width)) = constant_simple(left),
let Some(Constant::Float(ref rhs_value, rhs_width)) = constant_simple(right),
let Some(0.0) = lhs_value.parse().ok(),
let Some(0.0) = rhs_value.parse().ok()
],

10
tests/cc_seme.rs
View file

@ -3,8 +3,8 @@
#[allow(dead_code)]
enum Baz {
Baz1,
Baz2,
One,
Two,
}
struct Test {
@ -14,11 +14,11 @@ struct Test {
fn main() {
use Baz::*;
let x = Test { t: Some(0), b: Baz1 };
let x = Test { t: Some(0), b: One };
match x {
Test { t: Some(_), b: Baz1 } => unreachable!(),
Test { t: Some(42), b: Baz2 } => unreachable!(),
Test { t: Some(_), b: One } => unreachable!(),
Test { t: Some(42), b: Two } => unreachable!(),
Test { t: None, .. } => unreachable!(),
Test { .. } => unreachable!(),
}

4
tests/compile-fail/complex_types.rs
View file

@ -16,8 +16,8 @@ struct S {
struct TS(Vec<Vec<Box<(u32, u32, u32, u32)>>>); //~ERROR very complex type
enum E {
V1(Vec<Vec<Box<(u32, u32, u32, u32)>>>), //~ERROR very complex type
V2 { f: Vec<Vec<Box<(u32, u32, u32, u32)>>> }, //~ERROR very complex type
Tuple(Vec<Vec<Box<(u32, u32, u32, u32)>>>), //~ERROR very complex type
Struct { f: Vec<Vec<Box<(u32, u32, u32, u32)>>> }, //~ERROR very complex type
}
impl S {

12
tests/compile-fail/no_effect.rs
View file

@ -11,8 +11,8 @@ struct Struct {
field: i32
}
enum Enum {
TupleVariant(i32),
StructVariant { field: i32 },
Tuple(i32),
Struct { field: i32 },
}
fn get_number() -> i32 { 0 }
@ -26,14 +26,14 @@ fn main() {
Tuple(0); //~ERROR statement with no effect
Struct { field: 0 }; //~ERROR statement with no effect
Struct { ..s }; //~ERROR statement with no effect
Enum::TupleVariant(0); //~ERROR statement with no effect
Enum::StructVariant { field: 0 }; //~ERROR statement with no effect
Enum::Tuple(0); //~ERROR statement with no effect
Enum::Struct { field: 0 }; //~ERROR statement with no effect
// Do not warn
get_number();
Tuple(get_number());
Struct { field: get_number() };
Struct { ..get_struct() };
Enum::TupleVariant(get_number());
Enum::StructVariant { field: get_number() };
Enum::Tuple(get_number());
Enum::Struct { field: get_number() };
}

10
tests/compile-fail/used_underscore_binding.rs
View file

@ -50,17 +50,17 @@ fn multiple_underscores(__foo: u32) -> u32 {
fn _fn_test() {}
struct _StructTest;
enum _EnumTest {
_FieldA,
_FieldB(_StructTest)
_Empty,
_Value(_StructTest)
}
/// Test that we do not lint for non-variable bindings
fn non_variables() {
_fn_test();
let _s = _StructTest;
let _e = match _EnumTest::_FieldB(_StructTest) {
_EnumTest::_FieldA => 0,
_EnumTest::_FieldB(_st) => 1,
let _e = match _EnumTest::_Value(_StructTest) {
_EnumTest::_Empty => 0,
_EnumTest::_Value(_st) => 1,
};
let f = _fn_test;
f();

13
tests/consts.rs
View file

@ -18,7 +18,6 @@ use syntax::ast::StrStyle::*;
use syntax::ast::Sign::*;
use clippy::consts::{constant_simple, Constant};
use clippy::consts::Constant::*;
fn spanned<T>(t: T) -> Spanned<T> {
Spanned{ node: t, span: COMMAND_LINE_SP }
@ -45,18 +44,18 @@ fn check(expect: Constant, expr: &Expr) {
assert_eq!(Some(expect), constant_simple(expr))
}
const TRUE : Constant = ConstantBool(true);
const FALSE : Constant = ConstantBool(false);
const ZERO : Constant = ConstantInt(0, UnsuffixedIntLit(Plus));
const ONE : Constant = ConstantInt(1, UnsuffixedIntLit(Plus));
const TWO : Constant = ConstantInt(2, UnsuffixedIntLit(Plus));
const TRUE : Constant = Constant::Bool(true);
const FALSE : Constant = Constant::Bool(false);
const ZERO : Constant = Constant::Int(0, UnsuffixedIntLit(Plus));
const ONE : Constant = Constant::Int(1, UnsuffixedIntLit(Plus));
const TWO : Constant = Constant::Int(2, UnsuffixedIntLit(Plus));
#[test]
fn test_lit() {
check(TRUE, &lit(LitBool(true)));
check(FALSE, &lit(LitBool(false)));
check(ZERO, &lit(LitInt(0, UnsuffixedIntLit(Plus))));
check(ConstantStr("cool!".into(), CookedStr), &lit(LitStr(
check(Constant::Str("cool!".into(), CookedStr), &lit(LitStr(
InternedString::new("cool!"), CookedStr)));
}