1 //! Defines hir-level representation of visibility (e.g. `pub` and `pub(crate)`).
5 use hir_expand::{hygiene::Hygiene, InFile};
6 use la_arena::ArenaMap;
12 path::{ModPath, PathKind},
13 resolver::HasResolver,
14 FunctionId, HasModule, LocalFieldId, ModuleId, VariantId,
17 /// Visibility of an item, not yet resolved.
18 #[derive(Debug, Clone, PartialEq, Eq)]
19 pub enum RawVisibility {
20 /// `pub(in module)`, `pub(crate)` or `pub(super)`. Also private, which is
21 /// equivalent to `pub(self)`.
28 pub(crate) fn private() -> RawVisibility {
29 RawVisibility::Module(ModPath::from_kind(PathKind::Super(0)))
32 pub(crate) fn from_ast(
34 node: InFile<Option<ast::Visibility>>,
36 Self::from_ast_with_hygiene(node.value, &Hygiene::new(db.upcast(), node.file_id))
39 pub(crate) fn from_ast_with_hygiene(
40 node: Option<ast::Visibility>,
43 Self::from_ast_with_hygiene_and_default(node, RawVisibility::private(), hygiene)
46 pub(crate) fn from_ast_with_hygiene_and_default(
47 node: Option<ast::Visibility>,
48 default: RawVisibility,
51 let node = match node {
52 None => return default,
56 ast::VisibilityKind::In(path) => {
57 let path = ModPath::from_src(path, hygiene);
58 let path = match path {
59 None => return RawVisibility::private(),
62 RawVisibility::Module(path)
64 ast::VisibilityKind::PubCrate => {
65 let path = ModPath::from_kind(PathKind::Crate);
66 RawVisibility::Module(path)
68 ast::VisibilityKind::PubSuper => {
69 let path = ModPath::from_kind(PathKind::Super(1));
70 RawVisibility::Module(path)
72 ast::VisibilityKind::PubSelf => {
73 let path = ModPath::from_kind(PathKind::Plain);
74 RawVisibility::Module(path)
76 ast::VisibilityKind::Pub => RawVisibility::Public,
83 resolver: &crate::resolver::Resolver,
85 // we fall back to public visibility (i.e. fail open) if the path can't be resolved
86 resolver.resolve_visibility(db, self).unwrap_or(Visibility::Public)
90 /// Visibility of an item, with the path resolved.
91 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
93 /// Visibility is restricted to a certain module.
95 /// Visibility is unrestricted.
100 pub fn is_visible_from(self, db: &dyn DefDatabase, from_module: ModuleId) -> bool {
101 let to_module = match self {
102 Visibility::Module(m) => m,
103 Visibility::Public => return true,
105 // if they're not in the same crate, it can't be visible
106 if from_module.krate != to_module.krate {
109 let def_map = from_module.def_map(db);
110 self.is_visible_from_def_map(db, &def_map, from_module.local_id)
113 pub(crate) fn is_visible_from_other_crate(self) -> bool {
115 Visibility::Module(_) => false,
116 Visibility::Public => true,
120 pub(crate) fn is_visible_from_def_map(
122 db: &dyn DefDatabase,
124 mut from_module: crate::LocalModuleId,
126 let mut to_module = match self {
127 Visibility::Module(m) => m,
128 Visibility::Public => return true,
131 // `to_module` might be the root module of a block expression. Those have the same
132 // visibility as the containing module (even though no items are directly nameable from
133 // there, getting this right is important for method resolution).
134 // In that case, we adjust the visibility of `to_module` to point to the containing module.
135 if to_module.is_block_root(db) {
136 to_module = to_module.containing_module(db).unwrap();
139 // from_module needs to be a descendant of to_module
140 let mut def_map = def_map;
143 if def_map.module_id(from_module) == to_module {
146 match def_map[from_module].parent {
148 from_module = parent;
151 match def_map.parent() {
153 parent_arc = module.def_map(db);
154 def_map = &*parent_arc;
155 from_module = module.local_id;
158 // Reached the root module, nothing left to check.
167 /// Returns the most permissive visibility of `self` and `other`.
169 /// If there is no subset relation between `self` and `other`, returns `None` (ie. they're only
170 /// visible in unrelated modules).
171 pub(crate) fn max(self, other: Visibility, def_map: &DefMap) -> Option<Visibility> {
172 match (self, other) {
173 (Visibility::Module(_), Visibility::Public)
174 | (Visibility::Public, Visibility::Module(_))
175 | (Visibility::Public, Visibility::Public) => Some(Visibility::Public),
176 (Visibility::Module(mod_a), Visibility::Module(mod_b)) => {
177 if mod_a.krate != mod_b.krate {
181 let mut a_ancestors = std::iter::successors(Some(mod_a.local_id), |m| {
182 let parent_id = def_map[*m].parent?;
185 let mut b_ancestors = std::iter::successors(Some(mod_b.local_id), |m| {
186 let parent_id = def_map[*m].parent?;
190 if a_ancestors.any(|m| m == mod_b.local_id) {
192 return Some(Visibility::Module(mod_b));
195 if b_ancestors.any(|m| m == mod_a.local_id) {
197 return Some(Visibility::Module(mod_a));
206 /// Resolve visibility of all specific fields of a struct or union variant.
207 pub(crate) fn field_visibilities_query(
208 db: &dyn DefDatabase,
209 variant_id: VariantId,
210 ) -> Arc<ArenaMap<LocalFieldId, Visibility>> {
211 let var_data = match variant_id {
212 VariantId::StructId(it) => db.struct_data(it).variant_data.clone(),
213 VariantId::UnionId(it) => db.union_data(it).variant_data.clone(),
214 VariantId::EnumVariantId(it) => {
215 db.enum_data(it.parent).variants[it.local_id].variant_data.clone()
218 let resolver = variant_id.module(db).resolver(db);
219 let mut res = ArenaMap::default();
220 for (field_id, field_data) in var_data.fields().iter() {
221 res.insert(field_id, field_data.visibility.resolve(db, &resolver))
226 /// Resolve visibility of a function.
227 pub(crate) fn function_visibility_query(db: &dyn DefDatabase, def: FunctionId) -> Visibility {
228 let resolver = def.resolver(db);
229 db.function_data(def).visibility.resolve(db, &resolver)