2016-07-12 10:36:11 -05:00
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use rustc::lint::*;
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use rustc::hir::*;
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2016-07-15 11:10:28 -05:00
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use utils::{span_lint, get_trait_def_id, paths};
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2016-07-12 10:36:11 -05:00
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2016-08-06 02:55:04 -05:00
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/// **What it does:** Checks for mis-uses of the serde API.
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2016-07-12 10:36:11 -05:00
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///
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2016-08-06 02:55:04 -05:00
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/// **Why is this bad?** 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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2016-07-12 10:36:11 -05:00
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///
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/// **Known problems:** None.
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///
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2016-08-06 02:55:04 -05:00
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/// **Example:** Implementing `Visitor::visit_string` but not `Visitor::visit_str`.
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2016-07-12 10:36:11 -05:00
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declare_lint! {
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pub SERDE_API_MISUSE, Warn,
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"Various things that will negatively affect your serde experience"
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}
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#[derive(Copy, Clone)]
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pub struct Serde;
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impl LintPass for Serde {
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fn get_lints(&self) -> LintArray {
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lint_array!(SERDE_API_MISUSE)
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}
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}
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impl LateLintPass for Serde {
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fn check_item(&mut self, cx: &LateContext, item: &Item) {
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if let ItemImpl(_, _, _, Some(ref trait_ref), _, ref items) = item.node {
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let did = cx.tcx.expect_def(trait_ref.ref_id).def_id();
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2016-07-15 11:10:28 -05:00
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if let Some(visit_did) = get_trait_def_id(cx, &paths::SERDE_DE_VISITOR) {
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2016-07-12 10:36:11 -05:00
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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.name.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(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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