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This commit is contained in:
llogiq 2015-09-02 08:19:47 +02:00
parent bc1eb84810
commit 0fb7d1d2d9
4 changed files with 40 additions and 21 deletions
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22
src/shadow.rs
View file

@ -6,7 +6,7 @@ use syntax::visit::FnKind;
use rustc::lint::{Context, LintArray, LintPass};
use rustc::middle::def::Def::{DefVariant, DefStruct};
use utils::{in_external_macro, snippet, span_lint};
use utils::{in_external_macro, snippet, span_lint, span_note_and_lint};
declare_lint!(pub SHADOW_SAME, Allow,
"rebinding a name to itself, e.g. `let mut x = &mut x`");
@ -131,9 +131,9 @@ fn check_pat(cx: &Context, pat: &Pat, init: &Option<&Expr>, span: Span,
PatBox(ref inner) => {
if let Some(ref initp) = *init {
if let ExprBox(_, ref inner_init) = initp.node {
check_pat(cx, inner, &Some(&**inner_init), span, bindings),
check_pat(cx, inner, &Some(&**inner_init), span, bindings);
} else {
check_pat(cx, inner, init, span, bindings),
check_pat(cx, inner, init, span, bindings);
}
} else {
check_pat(cx, inner, init, span, bindings);
@ -149,7 +149,7 @@ fn check_pat(cx: &Context, pat: &Pat, init: &Option<&Expr>, span: Span,
fn lint_shadow<T>(cx: &Context, name: Name, span: Span, lspan: Span, init:
&Option<T>) where T: Deref<Target=Expr> {
if let &Some(ref expr) = init {
if let Some(ref expr) = *init {
if is_self_shadow(name, expr) {
span_lint(cx, SHADOW_SAME, span, &format!(
"{} is shadowed by itself in {}",
@ -157,20 +157,22 @@ fn lint_shadow<T>(cx: &Context, name: Name, span: Span, lspan: Span, init:
snippet(cx, expr.span, "..")));
} else {
if contains_self(name, expr) {
span_lint(cx, SHADOW_REUSE, span, &format!(
span_note_and_lint(cx, SHADOW_REUSE, lspan, &format!(
"{} is shadowed by {} which reuses the original value",
snippet(cx, lspan, "_"),
snippet(cx, expr.span, "..")));
snippet(cx, expr.span, "..")),
expr.span, "initialization happens here");
} else {
span_lint(cx, SHADOW_UNRELATED, span, &format!(
"{} is shadowed by {} in this declaration",
span_note_and_lint(cx, SHADOW_UNRELATED, lspan, &format!(
"{} is shadowed by {}",
snippet(cx, lspan, "_"),
snippet(cx, expr.span, "..")));
snippet(cx, expr.span, "..")),
expr.span, "initialization happens here");
}
}
} else {
span_lint(cx, SHADOW_UNRELATED, span, &format!(
"{} is shadowed in this declaration", snippet(cx, lspan, "_")));
"{} shadows a previous declaration", snippet(cx, lspan, "_")));
}
}

19
src/utils.rs
View file

@ -23,7 +23,7 @@ pub fn in_macro(cx: &Context, opt_info: Option<&ExpnInfo>) -> bool {
if info.callee.name() == "closure expansion" {
return false;
}
},
},
ExpnFormat::MacroAttribute(..) => {
// these are all plugins
return true;
@ -177,7 +177,7 @@ pub fn span_lint(cx: &Context, lint: &'static Lint, sp: Span, msg: &str) {
pub fn span_help_and_lint(cx: &Context, lint: &'static Lint, span: Span,
msg: &str, help: &str) {
span_lint(cx, lint, span, msg);
cx.span_lint(lint, span, msg);
if cx.current_level(lint) != Level::Allow {
cx.sess().fileline_help(span, &format!("{}\nfor further information \
visit https://github.com/Manishearth/rust-clippy/wiki#{}",
@ -185,6 +185,21 @@ pub fn span_help_and_lint(cx: &Context, lint: &'static Lint, span: Span,
}
}
pub fn span_note_and_lint(cx: &Context, lint: &'static Lint, span: Span,
msg: &str, note_span: Span, note: &str) {
cx.span_lint(lint, span, msg);
if cx.current_level(lint) != Level::Allow {
if note_span == span {
cx.sess().fileline_note(note_span, note)
} else {
cx.sess().span_note(note_span, note)
}
cx.sess().fileline_help(span, &format!("for further information visit \
https://github.com/Manishearth/rust-clippy/wiki#{}",
lint.name_lower()))
}
}
/// return the base type for references and raw pointers
pub fn walk_ptrs_ty(ty: ty::Ty) -> ty::Ty {
match ty.sty {

18
tests/compile-fail/matches.rs
View file

@ -39,14 +39,16 @@ fn single_match(){
}
fn ref_pats() {
let ref v = Some(0);
match v { //~ERROR instead of prefixing all patterns with `&`
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
match v { // this doesn't trigger, we have a different pattern
&Some(v) => println!("some"),
other => println!("other"),
{
let ref v = Some(0);
match v { //~ERROR instead of prefixing all patterns with `&`
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
match v { // this doesn't trigger, we have a different pattern
&Some(v) => println!("some"),
other => println!("other"),
}
}
let ref tup = (1, 2);
match tup { //~ERROR instead of prefixing all patterns with `&`

2
tests/compile-fail/shadow.rs
View file

@ -18,7 +18,7 @@ fn main() {
let x = (1, x); //~ERROR: x is shadowed by (1, x) which reuses
let x = first(x); //~ERROR: x is shadowed by first(x) which reuses
let y = 1;
let x = y; //~ERROR: x is shadowed by y in this declaration
let x = y; //~ERROR: x is shadowed by y
let o = Some(1u8);