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https://github.com/rust-lang/rust-clippy
synced 2025-02-26 04:17:21 +00:00
d647696c1f
So, some context for this, well, more a story. I'm not used to scripting, I've never really scripted anything, even if it's a valuable skill. I just never really needed it. Now, `@flip1995` correctly suggested using a script for this in `rust-clippy#7813`...
And I decided to write a script using nushell because why not? This was a mistake... I spend way more time on this than I would like to admit. It has definitely been more than 4 hours. It shouldn't take that long, but me being new to scripting and nushell just wasn't a good mixture... Anyway, here is the script that creates another script which adds the versions. Fun...
Just execute this on the `gh-pages` branch and the resulting `replacer.sh` in `clippy_lints` and it should all work.
```nu
mv v0.0.212 rust-1.00.0;
mv beta rust-1.57.0;
mv master rust-1.58.0;
let paths = (open ./rust-1.58.0/lints.json | select id id_span | flatten | select id path);
let versions = (
ls | where name =~ "rust-" | select name | format {name}/lints.json |
each { open $it | select id | insert version $it | str substring "5,11" version} |
group-by id | rotate counter-clockwise id version |
update version {get version | first 1} | flatten | select id version);
$paths | each { |row|
let version = ($versions | where id == ($row.id) | format {version})
let idu = ($row.id | str upcase)
$"sed -i '0,/($idu),/{s/pub ($idu),/#[clippy::version = "($version)"]\n pub ($idu),/}' ($row.path)"
} | str collect ";" | str find-replace --all '1.00.0' 'pre 1.29.0' | save "replacer.sh";
```
And this still has some problems, but at this point I just want to be done -.-
104 lines
3.1 KiB
Rust
104 lines
3.1 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::snippet;
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use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
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use if_chain::if_chain;
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use rustc_errors::Applicability;
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use rustc_hir::{Expr, ExprKind, LangItem, MatchSource};
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use rustc_lint::{LateContext, LateLintPass, LintContext};
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use rustc_middle::lint::in_external_macro;
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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use rustc_span::sym;
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for `match vec[idx]` or `match vec[n..m]`.
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///
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/// ### Why is this bad?
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/// This can panic at runtime.
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///
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/// ### Example
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/// ```rust, no_run
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/// let arr = vec![0, 1, 2, 3];
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/// let idx = 1;
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///
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/// // Bad
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/// match arr[idx] {
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/// 0 => println!("{}", 0),
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/// 1 => println!("{}", 3),
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/// _ => {},
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/// }
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/// ```
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/// Use instead:
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/// ```rust, no_run
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/// let arr = vec![0, 1, 2, 3];
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/// let idx = 1;
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///
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/// // Good
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/// match arr.get(idx) {
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/// Some(0) => println!("{}", 0),
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/// Some(1) => println!("{}", 3),
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/// _ => {},
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/// }
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/// ```
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#[clippy::version = "1.45.0"]
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pub MATCH_ON_VEC_ITEMS,
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pedantic,
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"matching on vector elements can panic"
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}
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declare_lint_pass!(MatchOnVecItems => [MATCH_ON_VEC_ITEMS]);
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impl<'tcx> LateLintPass<'tcx> for MatchOnVecItems {
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
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if_chain! {
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if !in_external_macro(cx.sess(), expr.span);
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if let ExprKind::Match(match_expr, _, MatchSource::Normal) = expr.kind;
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if let Some(idx_expr) = is_vec_indexing(cx, match_expr);
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if let ExprKind::Index(vec, idx) = idx_expr.kind;
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then {
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// FIXME: could be improved to suggest surrounding every pattern with Some(_),
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// but only when `or_patterns` are stabilized.
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span_lint_and_sugg(
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cx,
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MATCH_ON_VEC_ITEMS,
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match_expr.span,
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"indexing into a vector may panic",
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"try this",
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format!(
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"{}.get({})",
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snippet(cx, vec.span, ".."),
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snippet(cx, idx.span, "..")
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),
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Applicability::MaybeIncorrect
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);
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}
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}
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}
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}
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fn is_vec_indexing<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
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if_chain! {
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if let ExprKind::Index(array, index) = expr.kind;
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if is_vector(cx, array);
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if !is_full_range(cx, index);
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then {
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return Some(expr);
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}
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}
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None
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}
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fn is_vector(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
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let ty = cx.typeck_results().expr_ty(expr);
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let ty = ty.peel_refs();
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is_type_diagnostic_item(cx, ty, sym::Vec)
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}
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fn is_full_range(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
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let ty = cx.typeck_results().expr_ty(expr);
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let ty = ty.peel_refs();
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is_type_lang_item(cx, ty, LangItem::RangeFull)
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}
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