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//! Name resolution.
use std::sync::Arc;
use rustc_hash::FxHashMap;
use crate::{
ModuleDef, Module,
db::HirDatabase,
name::{Name, KnownName},
nameres::{PerNs, ItemMap},
generics::GenericParams,
expr::{scope::{ExprScopes, ScopeId}, PatId, Body},
impl_block::ImplBlock,
path::Path,
};
#[derive(Debug, Clone, Default)]
pub struct Resolver {
scopes: Vec<Scope>,
}
// TODO how to store these best
#[derive(Debug, Clone)]
pub(crate) struct ModuleItemMap {
item_map: Arc<ItemMap>,
module: Module,
}
#[derive(Debug, Clone)]
pub(crate) struct ExprScope {
expr_scopes: Arc<ExprScopes>,
scope_id: ScopeId,
}
#[derive(Debug, Clone)]
pub(crate) enum Scope {
/// All the items and imported names of a module
ModuleScope(ModuleItemMap),
/// Brings the generic parameters of an item into scope
GenericParams(Arc<GenericParams>),
/// Brings `Self` into scope
ImplBlockScope(ImplBlock),
/// Local bindings
ExprScope(ExprScope),
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Resolution {
/// An item
Def(ModuleDef),
/// A local binding (only value namespace)
LocalBinding(PatId),
/// A generic parameter
GenericParam(u32),
SelfType(ImplBlock),
}
impl Resolver {
pub fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
let mut resolution = PerNs::none();
for scope in self.scopes.iter().rev() {
resolution = resolution.combine(scope.resolve_name(name));
if resolution.is_both() {
return resolution;
}
}
resolution
}
pub fn resolve_path(&self, db: &impl HirDatabase, path: &Path) -> PerNs<Resolution> {
if let Some(name) = path.as_ident() {
self.resolve_name(name)
} else if path.is_self() {
self.resolve_name(&Name::self_param())
} else {
let (item_map, module) = match self.module() {
Some(m) => m,
_ => return PerNs::none(),
};
let module_res = item_map.resolve_path(db, module, path);
module_res.map(Resolution::Def)
}
}
pub fn all_names(&self) -> FxHashMap<Name, PerNs<Resolution>> {
let mut names = FxHashMap::default();
for scope in self.scopes.iter().rev() {
scope.collect_names(&mut |name, res| {
let current: &mut PerNs<Resolution> = names.entry(name).or_default();
if current.types.is_none() {
current.types = res.types;
}
if current.values.is_none() {
current.values = res.values;
}
});
}
names
}
fn module(&self) -> Option<(&ItemMap, Module)> {
self.scopes.iter().rev().find_map(|scope| match scope {
Scope::ModuleScope(m) => Some((&*m.item_map, m.module.clone())),
_ => None,
})
}
/// The body from which any `LocalBinding` resolutions in this resolver come.
pub fn body(&self) -> Option<Arc<Body>> {
self.scopes.iter().rev().find_map(|scope| match scope {
Scope::ExprScope(expr_scope) => Some(expr_scope.expr_scopes.body()),
_ => None,
})
}
}
impl Resolver {
pub(crate) fn push_scope(mut self, scope: Scope) -> Resolver {
self.scopes.push(scope);
self
}
pub(crate) fn push_generic_params_scope(self, params: Arc<GenericParams>) -> Resolver {
self.push_scope(Scope::GenericParams(params))
}
pub(crate) fn push_impl_block_scope(self, impl_block: ImplBlock) -> Resolver {
self.push_scope(Scope::ImplBlockScope(impl_block))
}
pub(crate) fn push_module_scope(self, item_map: Arc<ItemMap>, module: Module) -> Resolver {
self.push_scope(Scope::ModuleScope(ModuleItemMap { item_map, module }))
}
pub(crate) fn push_expr_scope(
self,
expr_scopes: Arc<ExprScopes>,
scope_id: ScopeId,
) -> Resolver {
self.push_scope(Scope::ExprScope(ExprScope { expr_scopes, scope_id }))
}
}
impl Scope {
fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
match self {
Scope::ModuleScope(m) => {
if let Some(KnownName::SelfParam) = name.as_known_name() {
PerNs::types(Resolution::Def(m.module.into()))
} else {
match m.item_map[m.module.module_id].get(name) {
Some(res) => res.def.map(Resolution::Def),
None => PerNs::none(),
}
}
}
Scope::GenericParams(gp) => match gp.find_by_name(name) {
Some(gp) => PerNs::types(Resolution::GenericParam(gp.idx)),
None => PerNs::none(),
},
Scope::ImplBlockScope(i) => {
if name.as_known_name() == Some(KnownName::SelfType) {
PerNs::types(Resolution::SelfType(i.clone()))
} else {
PerNs::none()
}
}
Scope::ExprScope(e) => {
let entry =
e.expr_scopes.entries(e.scope_id).iter().find(|entry| entry.name() == name);
match entry {
Some(e) => PerNs::values(Resolution::LocalBinding(e.pat())),
None => PerNs::none(),
}
}
}
}
fn collect_names(&self, f: &mut FnMut(Name, PerNs<Resolution>)) {
match self {
Scope::ModuleScope(m) => {
// TODO: should we provide `self` here?
// f(
// Name::self_param(),
// PerNs::types(Resolution::Def {
// def: m.module.into(),
// }),
// );
m.item_map[m.module.module_id].entries().for_each(|(name, res)| {
f(name.clone(), res.def.map(Resolution::Def));
});
m.item_map.extern_prelude.iter().for_each(|(name, def)| {
f(name.clone(), PerNs::types(Resolution::Def(*def)));
});
}
Scope::GenericParams(gp) => {
for param in &gp.params {
f(param.name.clone(), PerNs::types(Resolution::GenericParam(param.idx)))
}
}
Scope::ImplBlockScope(i) => {
f(Name::self_type(), PerNs::types(Resolution::SelfType(i.clone())));
}
Scope::ExprScope(e) => {
e.expr_scopes.entries(e.scope_id).iter().for_each(|e| {
f(e.name().clone(), PerNs::values(Resolution::LocalBinding(e.pat())));
});
}
}
}
}
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