101 lines
2.4 KiB
Rust
101 lines
2.4 KiB
Rust
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#![allow(unused_variables, dead_code)]
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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,
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name::Name,
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nameres::{PerNs, lower::ImportId, ItemMap},
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module_tree::ModuleId,
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generics::GenericParams,
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expr::{Body, scope::{ExprScopes, ScopeId}, PatId},
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impl_block::ImplBlock,
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path::Path,
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};
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#[derive(Debug, Clone)]
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pub struct Resolver {
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scopes: Vec<Scope>, // maybe a 'linked list' of scopes? or allow linking a Resolver to a parent Resolver? that's an optimization that might not be necessary, though
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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_id: ModuleId,
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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 the function parameters into scope
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FunctionParams(Arc<Body>),
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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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/// An item
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Def {
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def: ModuleDef,
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import: Option<ImportId>,
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},
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/// A local binding (only value namespace)
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LocalBinding { pat: PatId },
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/// A generic parameter
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GenericParam { idx: u32 },
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// TODO how does `Self` resolve?
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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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for scope in self.scopes.iter().rev() {
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let resolution = scope.resolve_name(name);
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if !resolution.is_none() {
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return resolution;
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}
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}
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PerNs::none()
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}
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pub fn resolve_path(&self, path: &Path) -> PerNs<Resolution> {
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unimplemented!()
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}
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pub fn all_names(&self) -> FxHashMap<Name, Resolution> {
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unimplemented!()
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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 pop_scope(mut self) -> Resolver {
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self.scopes.pop();
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self
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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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unimplemented!()
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}
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}
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