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Use if_chain in Increment/InitializeVisitor

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This commit is contained in:
rail 2020-06-10 14:21:58 +12:00
parent cc1998f7b3
commit dc89bb1135
1 changed files with 23 additions and 20 deletions
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43
clippy_lints/src/loops.rs
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@ -2162,15 +2162,16 @@ impl<'a, 'tcx> Visitor<'tcx> for IncrementVisitor<'a, 'tcx> {
match parent.kind {
ExprKind::AssignOp(op, ref lhs, ref rhs) => {
if lhs.hir_id == expr.hir_id {
if op.node == BinOpKind::Add && is_integer_const(self.cx, rhs, 1) {
*state = match *state {
VarState::Initial if self.depth == 0 => VarState::IncrOnce,
_ => VarState::DontWarn,
};
*state = if op.node == BinOpKind::Add
&& is_integer_const(self.cx, rhs, 1)
&& *state == VarState::Initial
&& self.depth == 0
{
VarState::IncrOnce
} else {
// Assigned some other value
*state = VarState::DontWarn;
}
// Assigned some other value or assigned multiple times
VarState::DontWarn
};
}
},
ExprKind::Assign(ref lhs, _, _) if lhs.hir_id == expr.hir_id => *state = VarState::DontWarn,
@ -2212,18 +2213,20 @@ impl<'a, 'tcx> Visitor<'tcx> for InitializeVisitor<'a, 'tcx> {
fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
// Look for declarations of the variable
if let StmtKind::Local(ref local) = stmt.kind {
if local.pat.hir_id == self.var_id {
if let PatKind::Binding(.., ident, _) = local.pat.kind {
self.name = Some(ident.name);
self.state = local.init.as_ref().map_or(VarState::Declared, |init| {
if is_integer_const(&self.cx, init, 0) {
VarState::Warn
} else {
VarState::Declared
}
})
if_chain! {
if let StmtKind::Local(ref local) = stmt.kind;
if local.pat.hir_id == self.var_id;
if let PatKind::Binding(.., ident, _) = local.pat.kind;
then {
self.name = Some(ident.name);
self.state = if_chain! {
if let Some(ref init) = local.init;
if is_integer_const(&self.cx, init, 0);
then {
VarState::Warn
} else {
VarState::Declared
}
}
}
}