1 // Note: More specifically this lint is largely inspired (aka copied) from
5 // [`missing_doc`]: https://github.com/rust-lang/rust/blob/d6d05904697d89099b55da3331155392f1db9c00/src/librustc_lint/builtin.rs#L246
8 use crate::utils::span_lint;
9 use if_chain::if_chain;
11 use rustc::impl_lint_pass;
12 use rustc::lint::{LateContext, LateLintPass, LintArray, LintContext, LintPass};
14 use rustc_session::declare_tool_lint;
15 use syntax::ast::{self, MetaItem, MetaItemKind};
17 use syntax::source_map::Span;
19 declare_clippy_lint! {
20 /// **What it does:** Warns if there is missing doc for any documentable item
21 /// (public or private).
23 /// **Why is this bad?** Doc is good. *rustc* has a `MISSING_DOCS`
24 /// allowed-by-default lint for
25 /// public members, but has no way to enforce documentation of private items.
26 /// This lint fixes that.
28 /// **Known problems:** None.
29 pub MISSING_DOCS_IN_PRIVATE_ITEMS,
31 "detects missing documentation for public and private members"
34 pub struct MissingDoc {
35 /// Stack of whether #[doc(hidden)] is set
36 /// at each level which has lint attributes.
37 doc_hidden_stack: Vec<bool>,
40 impl ::std::default::Default for MissingDoc {
42 fn default() -> Self {
49 pub fn new() -> Self {
51 doc_hidden_stack: vec![false],
55 fn doc_hidden(&self) -> bool {
56 *self.doc_hidden_stack.last().expect("empty doc_hidden_stack")
59 fn has_include(meta: Option<MetaItem>) -> bool {
61 if let Some(meta) = meta;
62 if let MetaItemKind::List(list) = meta.kind;
63 if let Some(meta) = list.get(0);
64 if let Some(name) = meta.ident();
66 name.as_str() == "include"
73 fn check_missing_docs_attrs(
75 cx: &LateContext<'_, '_>,
76 attrs: &[ast::Attribute],
80 // If we're building a test harness, then warning about
81 // documentation is probably not really relevant right now.
82 if cx.sess().opts.test {
86 // `#[doc(hidden)]` disables missing_docs check.
87 if self.doc_hidden() {
91 if sp.from_expansion() {
97 .any(|a| a.check_name(sym!(doc)) && (a.is_value_str() || Self::has_include(a.meta())));
101 MISSING_DOCS_IN_PRIVATE_ITEMS,
103 &format!("missing documentation for {}", desc),
109 impl_lint_pass!(MissingDoc => [MISSING_DOCS_IN_PRIVATE_ITEMS]);
111 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
112 fn enter_lint_attrs(&mut self, _: &LateContext<'a, 'tcx>, attrs: &'tcx [ast::Attribute]) {
113 let doc_hidden = self.doc_hidden()
114 || attrs.iter().any(|attr| {
115 attr.check_name(sym!(doc))
116 && match attr.meta_item_list() {
118 Some(l) => attr::list_contains_name(&l[..], sym!(hidden)),
121 self.doc_hidden_stack.push(doc_hidden);
124 fn exit_lint_attrs(&mut self, _: &LateContext<'a, 'tcx>, _: &'tcx [ast::Attribute]) {
125 self.doc_hidden_stack.pop().expect("empty doc_hidden_stack");
128 fn check_crate(&mut self, cx: &LateContext<'a, 'tcx>, krate: &'tcx hir::Crate<'_>) {
129 self.check_missing_docs_attrs(cx, &krate.attrs, krate.span, "crate");
132 fn check_item(&mut self, cx: &LateContext<'a, 'tcx>, it: &'tcx hir::Item<'_>) {
133 let desc = match it.kind {
134 hir::ItemKind::Const(..) => "a constant",
135 hir::ItemKind::Enum(..) => "an enum",
136 hir::ItemKind::Fn(..) => {
138 if it.ident.name == sym!(main) {
139 let def_id = cx.tcx.hir().local_def_id(it.hir_id);
140 let def_key = cx.tcx.hir().def_key(def_id);
141 if def_key.parent == Some(hir::def_id::CRATE_DEF_INDEX) {
147 hir::ItemKind::Mod(..) => "a module",
148 hir::ItemKind::Static(..) => "a static",
149 hir::ItemKind::Struct(..) => "a struct",
150 hir::ItemKind::Trait(..) => "a trait",
151 hir::ItemKind::TraitAlias(..) => "a trait alias",
152 hir::ItemKind::TyAlias(..) => "a type alias",
153 hir::ItemKind::Union(..) => "a union",
154 hir::ItemKind::OpaqueTy(..) => "an existential type",
155 hir::ItemKind::ExternCrate(..)
156 | hir::ItemKind::ForeignMod(..)
157 | hir::ItemKind::GlobalAsm(..)
158 | hir::ItemKind::Impl(..)
159 | hir::ItemKind::Use(..) => return,
162 self.check_missing_docs_attrs(cx, &it.attrs, it.span, desc);
165 fn check_trait_item(&mut self, cx: &LateContext<'a, 'tcx>, trait_item: &'tcx hir::TraitItem<'_>) {
166 let desc = match trait_item.kind {
167 hir::TraitItemKind::Const(..) => "an associated constant",
168 hir::TraitItemKind::Method(..) => "a trait method",
169 hir::TraitItemKind::Type(..) => "an associated type",
172 self.check_missing_docs_attrs(cx, &trait_item.attrs, trait_item.span, desc);
175 fn check_impl_item(&mut self, cx: &LateContext<'a, 'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
176 // If the method is an impl for a trait, don't doc.
177 let def_id = cx.tcx.hir().local_def_id(impl_item.hir_id);
178 match cx.tcx.associated_item(def_id).container {
179 ty::TraitContainer(_) => return,
180 ty::ImplContainer(cid) => {
181 if cx.tcx.impl_trait_ref(cid).is_some() {
187 let desc = match impl_item.kind {
188 hir::ImplItemKind::Const(..) => "an associated constant",
189 hir::ImplItemKind::Method(..) => "a method",
190 hir::ImplItemKind::TyAlias(_) => "an associated type",
191 hir::ImplItemKind::OpaqueTy(_) => "an existential type",
193 self.check_missing_docs_attrs(cx, &impl_item.attrs, impl_item.span, desc);
196 fn check_struct_field(&mut self, cx: &LateContext<'a, 'tcx>, sf: &'tcx hir::StructField<'_>) {
197 if !sf.is_positional() {
198 self.check_missing_docs_attrs(cx, &sf.attrs, sf.span, "a struct field");
202 fn check_variant(&mut self, cx: &LateContext<'a, 'tcx>, v: &'tcx hir::Variant<'_>) {
203 self.check_missing_docs_attrs(cx, &v.attrs, v.span, "a variant");