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//! HIR for trait definitions.
use std::sync::Arc;
use hir_expand::name::{AsName, Name};
use ra_syntax::ast::{self, NameOwner};
use rustc_hash::FxHashMap;
use crate::{
db::DefDatabase2, AssocItemId, AstItemDef, ConstId, FunctionId, LocationCtx, ModuleDefId,
ModuleId, TraitId, TypeAliasId,
};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TraitData {
pub name: Option<Name>,
pub items: Vec<AssocItemId>,
pub auto: bool,
}
impl TraitData {
pub(crate) fn trait_data_query(db: &impl DefDatabase2, tr: TraitId) -> Arc<TraitData> {
let src = tr.source(db);
let name = src.value.name().map(|n| n.as_name());
let module = tr.module(db);
let ctx = LocationCtx::new(db, module, src.file_id);
let auto = src.value.is_auto();
let items = if let Some(item_list) = src.value.item_list() {
item_list
.impl_items()
.map(|item_node| match item_node {
ast::ImplItem::FnDef(it) => FunctionId::from_ast(ctx, &it).into(),
ast::ImplItem::ConstDef(it) => ConstId::from_ast(ctx, &it).into(),
ast::ImplItem::TypeAliasDef(it) => TypeAliasId::from_ast(ctx, &it).into(),
})
.collect()
} else {
Vec::new()
};
Arc::new(TraitData { name, items, auto })
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TraitItemsIndex {
traits_by_def: FxHashMap<AssocItemId, TraitId>,
}
impl TraitItemsIndex {
pub fn trait_items_index(db: &impl DefDatabase2, module: ModuleId) -> TraitItemsIndex {
let mut index = TraitItemsIndex { traits_by_def: FxHashMap::default() };
let crate_def_map = db.crate_def_map(module.krate);
for decl in crate_def_map[module.module_id].scope.declarations() {
if let ModuleDefId::TraitId(tr) = decl {
for item in db.trait_data(tr).items.iter() {
index.traits_by_def.insert(*item, tr);
}
}
}
index
}
pub fn get_parent_trait(&self, item: AssocItemId) -> Option<TraitId> {
self.traits_by_def.get(&item).cloned()
}
}
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