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Merge pull request #50 from Manishearth/precedence

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Now without errors, refactored precedence lint
This commit is contained in:
llogiq 2015-05-06 14:42:48 +02:00
commit 9b3264e693
1 changed files with 10 additions and 12 deletions
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22
src/misc.rs
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@ -183,23 +183,21 @@ impl LintPass for Precedence {
fn check_expr(&mut self, cx: &Context, expr: &Expr) {
if let ExprBinary(Spanned { node: op, ..}, ref left, ref right) = expr.node {
if is_bit_op(op) {
if let ExprBinary(Spanned { node: lop, ..}, _, _) = left.node {
if is_arith_op(lop) {
cx.span_lint(PRECEDENCE, expr.span, "Operator precedence can trip the unwary. Please consider adding parenthesis to the subexpression to make the meaning more clear.");
}
} else {
if let ExprBinary(Spanned { node: rop, ..}, _, _) = right.node {
if is_arith_op(rop) {
cx.span_lint(PRECEDENCE, expr.span, "Operator precedence can trip the unwary. Please consider adding parenthesis to the subexpression to make the meaning more clear.");
}
}
}
if is_bit_op(op) && (is_arith_expr(left) || is_arith_expr(right)) {
cx.span_lint(PRECEDENCE, expr.span,
"Operator precedence can trip the unwary. Consider adding parenthesis to the subexpression.");
}
}
}
}
fn is_arith_expr(expr : &Expr) -> bool {
match expr.node {
ExprBinary(Spanned { node: op, ..}, _, _) => is_arith_op(op),
_ => false
}
}
fn is_bit_op(op : BinOp_) -> bool {
match op {
BiBitXor | BiBitAnd | BiBitOr | BiShl | BiShr => true,