36 lines
757 B
Rust
36 lines
757 B
Rust
|
use syntax::ast::*;
|
||
|
|
use rustc::lint::{EarlyContext, LintArray, LintPass, EarlyLintPass};
|
||
|
|
|
||
|
|
/// **What it does:** Checks for unnecessary double parentheses.
|
||
|
|
///
|
||
|
|
/// **Why is this bad?** This makes code harder to read and might indicate a
|
||
|
|
/// mistake.
|
||
|
|
///
|
||
|
|
/// **Known problems:** None.
|
||
|
|
///
|
||
|
|
/// **Example:**
|
||
|
|
/// ```rust
|
||
|
|
/// ((0))
|
||
|
|
/// foo((0))
|
||
|
|
/// ((1, 2))
|
||
|
|
/// ```
|
||
|
|
declare_lint! {
|
||
|
|
pub DOUBLE_PARENS, Warn,
|
||
|
|
"Warn on unnecessary double parentheses"
|
||
|
|
}
|
||
|
|
|
||
|
|
#[derive(Copy, Clone)]
|
||
|
|
pub struct DoubleParens;
|
||
|
|
|
||
|
|
impl LintPass for DoubleParens {
|
||
|
|
fn get_lints(&self) -> LintArray {
|
||
|
|
lint_array!(DOUBLE_PARENS)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl EarlyLintPass for DoubleParens {
|
||
|
|
fn check_expr(&mut self, cx: &EarlyContext, expr: &Expr) {
|
||
|
|
// insert check here.
|
||
|
|
}
|
||
|
|
}
|