2019-01-19 14:23:26 -06:00
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//! Name resolution.
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use std::sync::Arc;
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use rustc_hash::FxHashMap;
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use crate::{
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ModuleDef, Module,
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db::HirDatabase,
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name::{Name, KnownName},
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nameres::{PerNs, ItemMap},
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generics::GenericParams,
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expr::{scope::{ExprScopes, ScopeId}, PatId, Body},
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impl_block::ImplBlock,
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path::Path,
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};
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2019-01-23 16:08:41 -06:00
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#[derive(Debug, Clone, Default)]
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pub struct Resolver {
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scopes: Vec<Scope>,
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}
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// TODO how to store these best
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#[derive(Debug, Clone)]
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pub(crate) struct ModuleItemMap {
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item_map: Arc<ItemMap>,
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module: Module,
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}
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#[derive(Debug, Clone)]
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pub(crate) struct ExprScope {
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expr_scopes: Arc<ExprScopes>,
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scope_id: ScopeId,
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}
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#[derive(Debug, Clone)]
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pub(crate) enum Scope {
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/// All the items and imported names of a module
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ModuleScope(ModuleItemMap),
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/// Brings the generic parameters of an item into scope
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GenericParams(Arc<GenericParams>),
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/// Brings `Self` into scope
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ImplBlockScope(ImplBlock),
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/// Local bindings
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ExprScope(ExprScope),
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Resolution {
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// FIXME make these tuple variants
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/// An item
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Def(ModuleDef),
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/// A local binding (only value namespace)
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LocalBinding(PatId),
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/// A generic parameter
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GenericParam(u32),
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SelfType(ImplBlock),
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}
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impl Resolver {
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pub fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
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let mut resolution = PerNs::none();
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for scope in self.scopes.iter().rev() {
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resolution = resolution.combine(scope.resolve_name(name));
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if resolution.is_both() {
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return resolution;
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}
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}
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resolution
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}
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pub fn resolve_path(&self, db: &impl HirDatabase, path: &Path) -> PerNs<Resolution> {
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if let Some(name) = path.as_ident() {
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self.resolve_name(name)
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} else if path.is_self() {
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self.resolve_name(&Name::self_param())
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} else {
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let (item_map, module) = match self.module() {
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Some(m) => m,
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_ => return PerNs::none(),
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};
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let module_res = item_map.resolve_path(db, module, path);
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module_res.map(|def| Resolution::Def(def))
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}
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}
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pub fn all_names(&self) -> FxHashMap<Name, PerNs<Resolution>> {
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let mut names = FxHashMap::default();
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for scope in &self.scopes {
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scope.collect_names(&mut |name, res| {
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let current: &mut PerNs<Resolution> = names.entry(name).or_default();
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if current.types.is_none() {
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current.types = res.types;
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}
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if current.values.is_none() {
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current.values = res.values;
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}
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});
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}
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names
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}
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fn module(&self) -> Option<(&ItemMap, Module)> {
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self.scopes.iter().rev().find_map(|scope| match scope {
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Scope::ModuleScope(m) => Some((&*m.item_map, m.module.clone())),
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_ => None,
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})
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}
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/// The body from which any `LocalBinding` resolutions in this resolver come.
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pub fn body(&self) -> Option<Arc<Body>> {
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self.scopes.iter().rev().find_map(|scope| match scope {
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Scope::ExprScope(expr_scope) => Some(expr_scope.expr_scopes.body()),
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_ => None,
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})
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}
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}
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impl Resolver {
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pub(crate) fn push_scope(mut self, scope: Scope) -> Resolver {
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self.scopes.push(scope);
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self
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}
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pub(crate) fn push_generic_params_scope(self, params: Arc<GenericParams>) -> Resolver {
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self.push_scope(Scope::GenericParams(params))
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}
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pub(crate) fn push_impl_block_scope(self, impl_block: ImplBlock) -> Resolver {
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self.push_scope(Scope::ImplBlockScope(impl_block))
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}
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pub(crate) fn push_module_scope(self, item_map: Arc<ItemMap>, module: Module) -> Resolver {
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self.push_scope(Scope::ModuleScope(ModuleItemMap { item_map, module }))
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}
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pub(crate) fn push_expr_scope(
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self,
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expr_scopes: Arc<ExprScopes>,
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scope_id: ScopeId,
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) -> Resolver {
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self.push_scope(Scope::ExprScope(ExprScope {
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expr_scopes,
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scope_id,
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}))
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}
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}
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impl Scope {
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fn resolve_name(&self, name: &Name) -> PerNs<Resolution> {
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match self {
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Scope::ModuleScope(m) => {
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if let Some(KnownName::SelfParam) = name.as_known_name() {
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PerNs::types(Resolution::Def(m.module.into()))
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} else {
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match m.item_map[m.module.module_id].get(name) {
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Some(res) => res.def.map(Resolution::Def),
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None => PerNs::none(),
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}
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}
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}
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Scope::GenericParams(gp) => match gp.find_by_name(name) {
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Some(gp) => PerNs::types(Resolution::GenericParam(gp.idx)),
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None => PerNs::none(),
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},
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Scope::ImplBlockScope(i) => {
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if name.as_known_name() == Some(KnownName::SelfType) {
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PerNs::types(Resolution::SelfType(i.clone()))
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} else {
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PerNs::none()
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}
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}
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Scope::ExprScope(e) => {
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let entry = e
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.expr_scopes
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.entries(e.scope_id)
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.iter()
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.find(|entry| entry.name() == name);
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match entry {
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Some(e) => PerNs::values(Resolution::LocalBinding(e.pat())),
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None => PerNs::none(),
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}
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}
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}
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}
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fn collect_names(&self, f: &mut FnMut(Name, PerNs<Resolution>)) {
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match self {
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Scope::ModuleScope(m) => {
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// TODO: should we provide `self` here?
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// f(
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// Name::self_param(),
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// PerNs::types(Resolution::Def {
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// def: m.module.into(),
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// }),
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// );
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m.item_map[m.module.module_id]
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.entries()
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.for_each(|(name, res)| {
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f(name.clone(), res.def.map(Resolution::Def));
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})
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}
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Scope::GenericParams(gp) => {
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for param in &gp.params {
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f(
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param.name.clone(),
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PerNs::types(Resolution::GenericParam(param.idx)),
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)
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}
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}
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Scope::ImplBlockScope(i) => {
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f(
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Name::self_type(),
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PerNs::types(Resolution::SelfType(i.clone())),
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);
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}
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Scope::ExprScope(e) => {
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e.expr_scopes.entries(e.scope_id).iter().for_each(|e| {
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f(
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e.name().clone(),
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PerNs::values(Resolution::LocalBinding(e.pat())),
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);
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});
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}
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}
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}
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}
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