64 lines
2.0 KiB
Rust
64 lines
2.0 KiB
Rust
use crate::utils::span_lint_and_sugg;
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use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
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use rustc::{declare_lint_pass, declare_tool_lint};
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use rustc_errors::Applicability;
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use syntax::ast::*;
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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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declare_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 let ExprKind::Struct(_, ref fields, _) = expr.node {
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for field in 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.node {
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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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}
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