user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

use snippet_opt and span_suggestion

Browse source
This commit is contained in:
Oliver Schneider 2016-03-14 17:13:10 +01:00
parent 9dc282e31d
commit 6a566a1009
2 changed files with 26 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

20
src/needless_bool.rs
View file

@ -6,7 +6,7 @@ use rustc::lint::*;
use rustc_front::hir::*;
use syntax::ast::LitKind;
use syntax::codemap::Spanned;
use utils::{span_lint, span_lint_and_then, snippet};
use utils::{span_lint, span_lint_and_then, snippet, snippet_opt};
/// **What it does:** This lint checks for expressions of the form `if c { true } else { false }` (or vice versa) and suggest using the condition directly.
///
@ -50,16 +50,16 @@ impl LateLintPass for NeedlessBool {
use self::Expression::*;
if let ExprIf(ref pred, ref then_block, Some(ref else_expr)) = e.node {
let reduce = |hint: &str, not| {
let pred_snip = snippet(cx, pred.span, "..");
let hint = if pred_snip == ".." {
hint.into()
} else {
format!("`{}{}`", not, pred_snip)
let hint = match snippet_opt(cx, pred.span) {
Some(pred_snip) => format!("`{}{}`", not, pred_snip),
None => hint.into(),
};
span_lint(cx,
NEEDLESS_BOOL,
e.span,
&format!("you can reduce this if-then-else expression to just {}", hint));
span_lint_and_then(cx,
NEEDLESS_BOOL,
e.span,
"this if-then-else expression returns a bool literal", |db| {
db.span_suggestion(e.span, "you can reduce it to", hint);
});
};
match (fetch_bool_block(then_block), fetch_bool_expr(else_expr)) {
(RetBool(true), RetBool(true)) |