use either::Either;
use hir_expand::InFile;
use la_arena::ArenaMap;
use syntax::{ast, AstNode, AstPtr};
use crate::{
db::DefDatabase,
item_tree::{AttrOwner, FieldParent, ItemTreeNode},
GenericDefId, ItemTreeLoc, LocalFieldId, LocalLifetimeParamId, LocalTypeOrConstParamId, Lookup,
UseId, VariantId,
};
pub trait HasSource {
type Value: AstNode;
fn source(&self, db: &dyn DefDatabase) -> InFile<Self::Value> {
let InFile { file_id, value } = self.ast_ptr(db);
InFile::new(file_id, value.to_node(&db.parse_or_expand(file_id)))
}
fn ast_ptr(&self, db: &dyn DefDatabase) -> InFile<AstPtr<Self::Value>>;
}
impl<T> HasSource for T
where
T: ItemTreeLoc,
T::Id: ItemTreeNode,
{
type Value = <T::Id as ItemTreeNode>::Source;
fn ast_ptr(&self, db: &dyn DefDatabase) -> InFile<AstPtr<Self::Value>> {
let id = self.item_tree_id();
let file_id = id.file_id();
let tree = id.item_tree(db);
let ast_id_map = db.ast_id_map(file_id);
let node = &tree[id.value];
InFile::new(file_id, ast_id_map.get(node.ast_id()))
}
}
pub trait HasChildSource<ChildId> {
type Value;
fn child_source(&self, db: &dyn DefDatabase) -> InFile<ArenaMap<ChildId, Self::Value>>;
}
impl HasChildSource<la_arena::Idx<ast::UseTree>> for UseId {
type Value = ast::UseTree;
fn child_source(
&self,
db: &dyn DefDatabase,
) -> InFile<ArenaMap<la_arena::Idx<ast::UseTree>, Self::Value>> {
let loc = &self.lookup(db);
let use_ = &loc.id.item_tree(db)[loc.id.value];
InFile::new(
loc.id.file_id(),
use_.use_tree_source_map(db, loc.id.file_id()).into_iter().collect(),
)
}
}
impl HasChildSource<LocalTypeOrConstParamId> for GenericDefId {
type Value = Either<ast::TypeOrConstParam, ast::TraitOrAlias>;
fn child_source(
&self,
db: &dyn DefDatabase,
) -> InFile<ArenaMap<LocalTypeOrConstParamId, Self::Value>> {
let generic_params = db.generic_params(*self);
let mut idx_iter = generic_params.iter_type_or_consts().map(|(idx, _)| idx);
let (file_id, generic_params_list) = self.file_id_and_params_of(db);
let mut params = ArenaMap::default();
match *self {
GenericDefId::TraitId(id) => {
let trait_ref = id.lookup(db).source(db).value;
let idx = idx_iter.next().unwrap();
params.insert(idx, Either::Right(ast::TraitOrAlias::Trait(trait_ref)));
}
GenericDefId::TraitAliasId(id) => {
let alias = id.lookup(db).source(db).value;
let idx = idx_iter.next().unwrap();
params.insert(idx, Either::Right(ast::TraitOrAlias::TraitAlias(alias)));
}
_ => {}
}
if let Some(generic_params_list) = generic_params_list {
for (idx, ast_param) in idx_iter.zip(generic_params_list.type_or_const_params()) {
params.insert(idx, Either::Left(ast_param));
}
}
InFile::new(file_id, params)
}
}
impl HasChildSource<LocalLifetimeParamId> for GenericDefId {
type Value = ast::LifetimeParam;
fn child_source(
&self,
db: &dyn DefDatabase,
) -> InFile<ArenaMap<LocalLifetimeParamId, Self::Value>> {
let generic_params = db.generic_params(*self);
let idx_iter = generic_params.iter_lt().map(|(idx, _)| idx);
let (file_id, generic_params_list) = self.file_id_and_params_of(db);
let mut params = ArenaMap::default();
if let Some(generic_params_list) = generic_params_list {
for (idx, ast_param) in idx_iter.zip(generic_params_list.lifetime_params()) {
params.insert(idx, ast_param);
}
}
InFile::new(file_id, params)
}
}
impl HasChildSource<LocalFieldId> for VariantId {
type Value = Either<ast::TupleField, ast::RecordField>;
fn child_source(&self, db: &dyn DefDatabase) -> InFile<ArenaMap<LocalFieldId, Self::Value>> {
let item_tree;
let (src, parent, container) = match *self {
VariantId::EnumVariantId(it) => {
let lookup = it.lookup(db);
item_tree = lookup.id.item_tree(db);
(
lookup.source(db).map(|it| it.kind()),
FieldParent::Variant(lookup.id.value),
lookup.parent.lookup(db).container,
)
}
VariantId::StructId(it) => {
let lookup = it.lookup(db);
item_tree = lookup.id.item_tree(db);
(
lookup.source(db).map(|it| it.kind()),
FieldParent::Struct(lookup.id.value),
lookup.container,
)
}
VariantId::UnionId(it) => {
let lookup = it.lookup(db);
item_tree = lookup.id.item_tree(db);
(
lookup.source(db).map(|it| it.kind()),
FieldParent::Union(lookup.id.value),
lookup.container,
)
}
};
let mut map = ArenaMap::new();
match &src.value {
ast::StructKind::Tuple(fl) => {
let cfg_options = &db.crate_graph()[container.krate].cfg_options;
let mut idx = 0;
for (i, fd) in fl.fields().enumerate() {
let attrs = item_tree.attrs(
db,
container.krate,
AttrOwner::make_field_indexed(parent, i),
);
if !attrs.is_cfg_enabled(cfg_options) {
continue;
}
map.insert(
LocalFieldId::from_raw(la_arena::RawIdx::from(idx)),
Either::Left(fd.clone()),
);
idx += 1;
}
}
ast::StructKind::Record(fl) => {
let cfg_options = &db.crate_graph()[container.krate].cfg_options;
let mut idx = 0;
for (i, fd) in fl.fields().enumerate() {
let attrs = item_tree.attrs(
db,
container.krate,
AttrOwner::make_field_indexed(parent, i),
);
if !attrs.is_cfg_enabled(cfg_options) {
continue;
}
map.insert(
LocalFieldId::from_raw(la_arena::RawIdx::from(idx)),
Either::Right(fd.clone()),
);
idx += 1;
}
}
_ => (),
}
InFile::new(src.file_id, map)
}
}