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made shadow_unrelated allow, added previous binding span note, fixed #319

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This commit is contained in:
llogiq 2015-09-08 11:50:04 +02:00
parent b5d953bf7d
commit 4835372df5
4 changed files with 42 additions and 22 deletions
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2
README.md
View File

@ -48,7 +48,7 @@ name
[result_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#result_unwrap_used) | allow | using `Result.unwrap()`, which might be better handled
[shadow_reuse](https://github.com/Manishearth/rust-clippy/wiki#shadow_reuse) | allow | rebinding a name to an expression that re-uses the original value, e.g. `let x = x + 1`
[shadow_same](https://github.com/Manishearth/rust-clippy/wiki#shadow_same) | allow | rebinding a name to itself, e.g. `let mut x = &mut x`
[shadow_unrelated](https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated) | warn | The name is re-bound without even using the original value
[shadow_unrelated](https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated) | allow | The name is re-bound without even using the original value
[should_implement_trait](https://github.com/Manishearth/rust-clippy/wiki#should_implement_trait) | warn | defining a method that should be implementing a std trait
[single_match](https://github.com/Manishearth/rust-clippy/wiki#single_match) | warn | a match statement with a single nontrivial arm (i.e, where the other arm is `_ => {}`) is used; recommends `if let` instead
[str_to_string](https://github.com/Manishearth/rust-clippy/wiki#str_to_string) | warn | using `to_string()` on a str, which should be `to_owned()`

2
src/lib.rs
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@ -96,6 +96,7 @@ pub fn plugin_registrar(reg: &mut Registry) {
ptr_arg::PTR_ARG,
shadow::SHADOW_REUSE,
shadow::SHADOW_SAME,
shadow::SHADOW_UNRELATED,
strings::STRING_ADD,
strings::STRING_ADD_ASSIGN,
types::CAST_POSSIBLE_TRUNCATION,
@ -141,7 +142,6 @@ pub fn plugin_registrar(reg: &mut Registry) {
ranges::RANGE_STEP_BY_ZERO,
returns::LET_AND_RETURN,
returns::NEEDLESS_RETURN,
shadow::SHADOW_UNRELATED,
types::BOX_VEC,
types::LET_UNIT_VALUE,
types::LINKEDLIST,

55
src/shadow.rs
View File

@ -4,7 +4,7 @@ use reexport::*;
use syntax::codemap::Span;
use rustc_front::visit::FnKind;
use rustc::lint::{Context, LintArray, LintPass};
use rustc::lint::{Context, Level, Lint, LintArray, LintPass};
use rustc::middle::def::Def::{DefVariant, DefStruct};
use utils::{in_external_macro, snippet, span_lint, span_note_and_lint};
@ -14,7 +14,7 @@ declare_lint!(pub SHADOW_SAME, Allow,
declare_lint!(pub SHADOW_REUSE, Allow,
"rebinding a name to an expression that re-uses the original value, e.g. \
`let x = x + 1`");
declare_lint!(pub SHADOW_UNRELATED, Warn,
declare_lint!(pub SHADOW_UNRELATED, Allow,
"The name is re-bound without even using the original value");
#[derive(Copy, Clone)]
@ -36,13 +36,13 @@ fn check_fn(cx: &Context, decl: &FnDecl, block: &Block) {
let mut bindings = Vec::new();
for arg in &decl.inputs {
if let PatIdent(_, ident, _) = arg.pat.node {
bindings.push(ident.node.name)
bindings.push((ident.node.name, ident.span))
}
}
check_block(cx, block, &mut bindings);
}
fn check_block(cx: &Context, block: &Block, bindings: &mut Vec<Name>) {
fn check_block(cx: &Context, block: &Block, bindings: &mut Vec<(Name, Span)>) {
let len = bindings.len();
for stmt in &block.stmts {
match stmt.node {
@ -55,7 +55,7 @@ fn check_block(cx: &Context, block: &Block, bindings: &mut Vec<Name>) {
bindings.truncate(len);
}
fn check_decl(cx: &Context, decl: &Decl, bindings: &mut Vec<Name>) {
fn check_decl(cx: &Context, decl: &Decl, bindings: &mut Vec<(Name, Span)>) {
if in_external_macro(cx, decl.span) { return; }
if let DeclLocal(ref local) = decl.node {
let Local{ ref pat, ref ty, ref init, id: _, span } = **local;
@ -77,16 +77,23 @@ fn is_binding(cx: &Context, pat: &Pat) -> bool {
}
fn check_pat(cx: &Context, pat: &Pat, init: &Option<&Expr>, span: Span,
bindings: &mut Vec<Name>) {
bindings: &mut Vec<(Name, Span)>) {
//TODO: match more stuff / destructuring
match pat.node {
PatIdent(_, ref ident, ref inner) => {
let name = ident.node.name;
if is_binding(cx, pat) {
if bindings.contains(&name) {
lint_shadow(cx, name, span, pat.span, init);
} else {
bindings.push(name);
let mut new_binding = true;
for tup in bindings.iter_mut() {
if tup.0 == name {
lint_shadow(cx, name, span, pat.span, init, tup.1);
tup.1 = ident.span;
new_binding = false;
break;
}
}
if new_binding {
bindings.push((name, ident.span));
}
}
if let Some(ref p) = *inner { check_pat(cx, p, init, span, bindings); }
@ -141,20 +148,25 @@ fn check_pat(cx: &Context, pat: &Pat, init: &Option<&Expr>, span: Span,
},
PatRegion(ref inner, _) =>
check_pat(cx, inner, init, span, bindings),
//PatRange(P<Expr>, P<Expr>),
//PatVec(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
_ => (),
}
}
fn lint_shadow<T>(cx: &Context, name: Name, span: Span, lspan: Span, init:
&Option<T>) where T: Deref<Target=Expr> {
&Option<T>, prev_span: Span) where T: Deref<Target=Expr> {
fn note_orig(cx: &Context, lint: &'static Lint, span: Span) {
if cx.current_level(lint) != Level::Allow {
cx.sess().span_note(span, "previous binding is here");
}
}
if let Some(ref expr) = *init {
if is_self_shadow(name, expr) {
span_lint(cx, SHADOW_SAME, span, &format!(
"{} is shadowed by itself in {}",
snippet(cx, lspan, "_"),
snippet(cx, expr.span, "..")));
note_orig(cx, SHADOW_SAME, prev_span);
} else {
if contains_self(name, expr) {
span_note_and_lint(cx, SHADOW_REUSE, lspan, &format!(
@ -162,21 +174,24 @@ fn lint_shadow<T>(cx: &Context, name: Name, span: Span, lspan: Span, init:
snippet(cx, lspan, "_"),
snippet(cx, expr.span, "..")),
expr.span, "initialization happens here");
note_orig(cx, SHADOW_REUSE, prev_span);
} else {
span_note_and_lint(cx, SHADOW_UNRELATED, lspan, &format!(
"{} is shadowed by {}",
snippet(cx, lspan, "_"),
snippet(cx, expr.span, "..")),
expr.span, "initialization happens here");
note_orig(cx, SHADOW_UNRELATED, prev_span);
}
}
} else {
span_lint(cx, SHADOW_UNRELATED, span, &format!(
"{} shadows a previous declaration", snippet(cx, lspan, "_")));
note_orig(cx, SHADOW_UNRELATED, prev_span);
}
}
fn check_expr(cx: &Context, expr: &Expr, bindings: &mut Vec<Name>) {
fn check_expr(cx: &Context, expr: &Expr, bindings: &mut Vec<(Name, Span)>) {
if in_external_macro(cx, expr.span) { return; }
match expr.node {
ExprUnary(_, ref e) | ExprParen(ref e) | ExprField(ref e, _) |
@ -205,20 +220,20 @@ fn check_expr(cx: &Context, expr: &Expr, bindings: &mut Vec<Name>) {
for ref arm in arms {
for ref pat in &arm.pats {
check_pat(cx, &pat, &Some(&**init), pat.span, bindings);
//TODO: This is ugly, but needed to get the right type
//This is ugly, but needed to get the right type
if let Some(ref guard) = arm.guard {
check_expr(cx, guard, bindings);
}
check_expr(cx, &arm.body, bindings);
bindings.truncate(len);
}
if let Some(ref guard) = arm.guard {
check_expr(cx, guard, bindings);
}
check_expr(cx, &arm.body, bindings);
bindings.truncate(len);
}
},
_ => ()
}
}
fn check_ty(cx: &Context, ty: &Ty, bindings: &mut Vec<Name>) {
fn check_ty(cx: &Context, ty: &Ty, bindings: &mut Vec<(Name, Span)>) {
match ty.node {
TyParen(ref sty) | TyObjectSum(ref sty, _) |
TyVec(ref sty) => check_ty(cx, sty, bindings),

5
tests/compile-fail/shadow.rs
View File

@ -27,4 +27,9 @@ fn main() {
Some(p) => p, // no error, because the p above is in its own scope
None => 0,
};
match (x, o) {
(1, Some(a)) | (a, Some(1)) => (), // no error though `a` appears twice
_ => (),
}
}