61 lines
2.1 KiB
Rust
61 lines
2.1 KiB
Rust
use clippy_utils::diagnostics::span_lint;
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use clippy_utils::{get_trait_def_id, paths};
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use rustc_hir::{Impl, Item, ItemKind};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for mis-uses of the serde API.
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///
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/// ### Why is this bad?
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/// Serde is very finnicky about how its API should be
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/// used, but the type system can't be used to enforce it (yet?).
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///
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/// ### Example
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/// Implementing `Visitor::visit_string` but not
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/// `Visitor::visit_str`.
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#[clippy::version = "pre 1.29.0"]
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pub SERDE_API_MISUSE,
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correctness,
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"various things that will negatively affect your serde experience"
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}
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declare_lint_pass!(SerdeApi => [SERDE_API_MISUSE]);
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impl<'tcx> LateLintPass<'tcx> for SerdeApi {
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fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
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if let ItemKind::Impl(Impl {
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of_trait: Some(ref trait_ref),
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items,
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..
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}) = item.kind
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{
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let did = trait_ref.path.res.def_id();
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if let Some(visit_did) = get_trait_def_id(cx, &paths::SERDE_DE_VISITOR) {
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if did == visit_did {
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let mut seen_str = None;
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let mut seen_string = None;
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for item in *items {
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match item.ident.as_str() {
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"visit_str" => seen_str = Some(item.span),
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"visit_string" => seen_string = Some(item.span),
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_ => {},
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}
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}
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if let Some(span) = seen_string {
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if seen_str.is_none() {
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span_lint(
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cx,
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SERDE_API_MISUSE,
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span,
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"you should not implement `visit_string` without also implementing `visit_str`",
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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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}
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