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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},
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 {
// FIXME make these tuple variants
/// An item
Def {
def: ModuleDef,
},
/// A local binding (only value namespace)
LocalBinding {
pat: PatId,
},
/// A generic parameter
GenericParam {
idx: 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(|def| Resolution::Def { def })
}
}
pub fn all_names(&self) -> FxHashMap<Name, Resolution> {
unimplemented!()
}
fn module(&self) -> Option<(&ItemMap, Module)> {
for scope in self.scopes.iter().rev() {
match scope {
Scope::ModuleScope(m) => {
return Some((&m.item_map, m.module.clone()));
}
_ => {}
}
}
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 {
def: m.module.into(),
})
} else {
match m.item_map[m.module.module_id].get(name) {
Some(res) => res.def.map(|def| Resolution::Def { def }),
None => PerNs::none(),
}
}
}
Scope::GenericParams(gp) => match gp.find_by_name(name) {
Some(gp) => PerNs::types(Resolution::GenericParam { idx: 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 { pat: e.pat() }),
None => PerNs::none(),
}
}
}
}
}
|