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//! Defines hir-level representation of visibility (e.g. `pub` and `pub(crate)`).
use hir_expand::{hygiene::Hygiene, InFile};
use syntax::ast;
use crate::{
db::DefDatabase,
nameres::CrateDefMap,
path::{ModPath, PathKind},
ModuleId,
};
/// Visibility of an item, not yet resolved.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum RawVisibility {
/// `pub(in module)`, `pub(crate)` or `pub(super)`. Also private, which is
/// equivalent to `pub(self)`.
Module(ModPath),
/// `pub`.
Public,
}
impl RawVisibility {
pub(crate) const fn private() -> RawVisibility {
let path = ModPath { kind: PathKind::Super(0), segments: Vec::new() };
RawVisibility::Module(path)
}
pub(crate) fn from_ast(
db: &dyn DefDatabase,
node: InFile<Option<ast::Visibility>>,
) -> RawVisibility {
Self::from_ast_with_hygiene(node.value, &Hygiene::new(db.upcast(), node.file_id))
}
pub(crate) fn from_ast_with_hygiene(
node: Option<ast::Visibility>,
hygiene: &Hygiene,
) -> RawVisibility {
Self::from_ast_with_hygiene_and_default(node, RawVisibility::private(), hygiene)
}
pub(crate) fn from_ast_with_hygiene_and_default(
node: Option<ast::Visibility>,
default: RawVisibility,
hygiene: &Hygiene,
) -> RawVisibility {
let node = match node {
None => return default,
Some(node) => node,
};
match node.kind() {
ast::VisibilityKind::In(path) => {
let path = ModPath::from_src(path, hygiene);
let path = match path {
None => return RawVisibility::private(),
Some(path) => path,
};
RawVisibility::Module(path)
}
ast::VisibilityKind::PubCrate => {
let path = ModPath { kind: PathKind::Crate, segments: Vec::new() };
RawVisibility::Module(path)
}
ast::VisibilityKind::PubSuper => {
let path = ModPath { kind: PathKind::Super(1), segments: Vec::new() };
RawVisibility::Module(path)
}
ast::VisibilityKind::PubSelf => {
let path = ModPath { kind: PathKind::Plain, segments: Vec::new() };
RawVisibility::Module(path)
}
ast::VisibilityKind::Pub => RawVisibility::Public,
}
}
pub fn resolve(
&self,
db: &dyn DefDatabase,
resolver: &crate::resolver::Resolver,
) -> Visibility {
// we fall back to public visibility (i.e. fail open) if the path can't be resolved
resolver.resolve_visibility(db, self).unwrap_or(Visibility::Public)
}
}
/// Visibility of an item, with the path resolved.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum Visibility {
/// Visibility is restricted to a certain module.
Module(ModuleId),
/// Visibility is unrestricted.
Public,
}
impl Visibility {
pub fn is_visible_from(self, db: &dyn DefDatabase, from_module: ModuleId) -> bool {
let to_module = match self {
Visibility::Module(m) => m,
Visibility::Public => return true,
};
// if they're not in the same crate, it can't be visible
if from_module.krate != to_module.krate {
return false;
}
let def_map = db.crate_def_map(from_module.krate);
self.is_visible_from_def_map(&def_map, from_module.local_id)
}
pub(crate) fn is_visible_from_other_crate(self) -> bool {
match self {
Visibility::Module(_) => false,
Visibility::Public => true,
}
}
pub(crate) fn is_visible_from_def_map(
self,
def_map: &CrateDefMap,
from_module: crate::LocalModuleId,
) -> bool {
let to_module = match self {
Visibility::Module(m) => m,
Visibility::Public => return true,
};
// from_module needs to be a descendant of to_module
let mut ancestors = std::iter::successors(Some(from_module), |m| {
let parent_id = def_map[*m].parent?;
Some(parent_id)
});
ancestors.any(|m| m == to_module.local_id)
}
/// Returns the most permissive visibility of `self` and `other`.
///
/// If there is no subset relation between `self` and `other`, returns `None` (ie. they're only
/// visible in unrelated modules).
pub(crate) fn max(self, other: Visibility, def_map: &CrateDefMap) -> Option<Visibility> {
match (self, other) {
(Visibility::Module(_), Visibility::Public)
| (Visibility::Public, Visibility::Module(_))
| (Visibility::Public, Visibility::Public) => Some(Visibility::Public),
(Visibility::Module(mod_a), Visibility::Module(mod_b)) => {
if mod_a.krate != mod_b.krate {
return None;
}
let mut a_ancestors = std::iter::successors(Some(mod_a.local_id), |m| {
let parent_id = def_map[*m].parent?;
Some(parent_id)
});
let mut b_ancestors = std::iter::successors(Some(mod_b.local_id), |m| {
let parent_id = def_map[*m].parent?;
Some(parent_id)
});
if a_ancestors.any(|m| m == mod_b.local_id) {
// B is above A
return Some(Visibility::Module(mod_b));
}
if b_ancestors.any(|m| m == mod_a.local_id) {
// A is above B
return Some(Visibility::Module(mod_a));
}
None
}
}
}
}
|
