87 lines
2.6 KiB
Rust
87 lines
2.6 KiB
Rust
use crate::utils::{meets_msrv, span_lint_and_sugg};
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use rustc_ast::ast::{Expr, ExprKind};
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use rustc_errors::Applicability;
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use rustc_lint::{EarlyContext, EarlyLintPass};
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use rustc_middle::lint::in_external_macro;
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use rustc_semver::RustcVersion;
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use rustc_session::{declare_tool_lint, impl_lint_pass};
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const REDUNDANT_FIELD_NAMES_MSRV: RustcVersion = RustcVersion::new(1, 17, 0);
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declare_clippy_lint! {
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/// **What it does:** Checks for fields in struct literals where shorthands
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/// could be used.
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///
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/// **Why is this bad?** If the field and variable names are the same,
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/// the field name is redundant.
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///
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/// **Known problems:** None.
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///
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/// **Example:**
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/// ```rust
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/// let bar: u8 = 123;
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///
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/// struct Foo {
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/// bar: u8,
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/// }
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///
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/// let foo = Foo { bar: bar };
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/// ```
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/// the last line can be simplified to
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/// ```ignore
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/// let foo = Foo { bar };
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/// ```
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pub REDUNDANT_FIELD_NAMES,
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style,
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"checks for fields in struct literals where shorthands could be used"
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}
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pub struct RedundantFieldNames {
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msrv: Option<RustcVersion>,
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}
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impl RedundantFieldNames {
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#[must_use]
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pub fn new(msrv: Option<RustcVersion>) -> Self {
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Self { msrv }
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}
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}
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impl_lint_pass!(RedundantFieldNames => [REDUNDANT_FIELD_NAMES]);
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impl EarlyLintPass for RedundantFieldNames {
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fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
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if !meets_msrv(self.msrv.as_ref(), &REDUNDANT_FIELD_NAMES_MSRV) {
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return;
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}
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if in_external_macro(cx.sess, expr.span) {
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return;
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}
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if let ExprKind::Struct(ref se) = expr.kind {
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for field in &se.fields {
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if field.is_shorthand {
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continue;
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}
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if let ExprKind::Path(None, path) = &field.expr.kind {
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if path.segments.len() == 1
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&& path.segments[0].ident == field.ident
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&& path.segments[0].args.is_none()
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{
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span_lint_and_sugg(
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cx,
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REDUNDANT_FIELD_NAMES,
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field.span,
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"redundant field names in struct initialization",
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"replace it with",
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field.ident.to_string(),
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Applicability::MachineApplicable,
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);
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}
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}
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}
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}
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}
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extract_msrv_attr!(EarlyContext);
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}
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