60 lines
2.0 KiB
Rust
60 lines
2.0 KiB
Rust
use rustc::lint::*;
|
|
use rustc::hir::*;
|
|
use utils::{get_trait_def_id, paths, span_lint};
|
|
|
|
/// **What it does:** Checks for mis-uses of the serde API.
|
|
///
|
|
/// **Why is this bad?** Serde is very finnicky about how its API should be
|
|
/// used, but the type system can't be used to enforce it (yet).
|
|
///
|
|
/// **Known problems:** None.
|
|
///
|
|
/// **Example:** Implementing `Visitor::visit_string` but not
|
|
/// `Visitor::visit_str`.
|
|
declare_lint! {
|
|
pub SERDE_API_MISUSE,
|
|
Warn,
|
|
"various things that will negatively affect your serde experience"
|
|
}
|
|
|
|
|
|
#[derive(Copy, Clone)]
|
|
pub struct Serde;
|
|
|
|
impl LintPass for Serde {
|
|
fn get_lints(&self) -> LintArray {
|
|
lint_array!(SERDE_API_MISUSE)
|
|
}
|
|
}
|
|
|
|
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Serde {
|
|
fn check_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx Item) {
|
|
if let ItemImpl(_, _, _, _, Some(ref trait_ref), _, ref items) = item.node {
|
|
let did = trait_ref.path.def.def_id();
|
|
if let Some(visit_did) = get_trait_def_id(cx, &paths::SERDE_DE_VISITOR) {
|
|
if did == visit_did {
|
|
let mut seen_str = None;
|
|
let mut seen_string = None;
|
|
for item in items {
|
|
match &*item.name.as_str() {
|
|
"visit_str" => seen_str = Some(item.span),
|
|
"visit_string" => seen_string = Some(item.span),
|
|
_ => {},
|
|
}
|
|
}
|
|
if let Some(span) = seen_string {
|
|
if seen_str.is_none() {
|
|
span_lint(
|
|
cx,
|
|
SERDE_API_MISUSE,
|
|
span,
|
|
"you should not implement `visit_string` without also implementing `visit_str`",
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|