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//! HIR for trait definitions.
use std::sync::Arc;
use rustc_hash::FxHashMap;
use ra_syntax::ast::{self, NameOwner};
use crate::{
Function, Const, TypeAlias, Name, DefDatabase, Trait, AstDatabase, Module,
ids::LocationCtx, name::AsName,
};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TraitData {
name: Option<Name>,
items: Vec<TraitItem>,
auto: bool,
}
impl TraitData {
pub(crate) fn trait_data_query(
db: &(impl DefDatabase + AstDatabase),
tr: Trait,
) -> Arc<TraitData> {
let (file_id, node) = tr.source(db);
let name = node.name().map(|n| n.as_name());
let module = tr.module(db);
let ctx = LocationCtx::new(db, module, file_id);
let auto = node.is_auto();
let items = if let Some(item_list) = node.item_list() {
item_list
.impl_items()
.map(|item_node| match item_node.kind() {
ast::ImplItemKind::FnDef(it) => Function { id: ctx.to_def(it) }.into(),
ast::ImplItemKind::ConstDef(it) => Const { id: ctx.to_def(it) }.into(),
ast::ImplItemKind::TypeAliasDef(it) => TypeAlias { id: ctx.to_def(it) }.into(),
})
.collect()
} else {
Vec::new()
};
Arc::new(TraitData { name, items, auto })
}
pub(crate) fn name(&self) -> &Option<Name> {
&self.name
}
pub(crate) fn items(&self) -> &[TraitItem] {
&self.items
}
pub(crate) fn is_auto(&self) -> bool {
self.auto
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum TraitItem {
Function(Function),
Const(Const),
TypeAlias(TypeAlias),
// Existential
}
// FIXME: not every function, ... is actually a trait item. maybe we should make
// sure that you can only turn actual trait items into TraitItems. This would
// require not implementing From, and instead having some checked way of
// casting them.
impl_froms!(TraitItem: Function, Const, TypeAlias);
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TraitItemsIndex {
traits_by_def: FxHashMap<TraitItem, Trait>,
}
impl TraitItemsIndex {
pub(crate) fn trait_items_index(db: &impl DefDatabase, module: Module) -> TraitItemsIndex {
let mut index = TraitItemsIndex { traits_by_def: FxHashMap::default() };
for decl in module.declarations(db) {
match decl {
crate::ModuleDef::Trait(tr) => {
for item in tr.trait_data(db).items() {
index.traits_by_def.insert(*item, tr);
}
}
_ => {}
}
}
index
}
pub(crate) fn get_parent_trait(&self, item: TraitItem) -> Option<Trait> {
self.traits_by_def.get(&item).cloned()
}
}
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