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This commit is contained in:
Zaki Manian 2017-09-02 14:09:41 -07:00
parent 9e3be6ae49
commit 2a97aadacf
1 changed files with 46 additions and 10 deletions
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56
clippy_lints/src/is_unit_expr.rs
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@ -35,19 +35,55 @@ impl LintPass for UnitExpr {
impl EarlyLintPass for UnitExpr {
fn check_expr(&mut self, cx: &EarlyContext, expr: &Expr) {
if let ExprKind::Assign(ref left, ref right) = expr.node {
unimplemented!();
}
if let ExprKind::MethodCall(ref path, ref args) = expr.node {
unimplemented!();
}
if let ExprKind::Call(ref path, ref args) = expr.node{
unimplemented!();
if is_unit_expr(right){
span_lint_and_sugg(
cx,
UNIT_EXPR,
right.span,
"trailing semicolons can be tricky",
"remove the last semicolon",
"TODO".to_owned()
)
}
}
// if let ExprKind::MethodCall(ref path, ref args) = expr.node {
// unimplemented!();
// }
// if let ExprKind::Call(ref path, ref args) = expr.node{
// unimplemented!();
// }
}
fn check_stmt(&mut self, cx: &EarlyContext, stmt: &Stmt) {
if let StmtKind::Local(ref data) = stmt.node{
unimplemented!();
}
if let StmtKind::Local(ref local) = stmt.node{
if local.pat.node == PatKind::Wild {return;}
if let Some(ref expr) = local.init{
if is_unit_expr(expr){
span_lint_and_sugg(
cx,
UNIT_EXPR,
local.span,
"trailing semicolons can be tricky",
"remove the last semicolon",
"TODO".to_owned()
)
}
}
}
}
}
fn is_unit_expr(expr: &Expr)->bool{
match expr.node{
ExprKind::Block(ref next) => {
let ref final_stmt = &next.stmts[next.stmts.len()-1];
if let StmtKind::Expr(_) = final_stmt.node{
return false;
}
else{
return true;
}
},
_ => return false,
}
}