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|
use std::sync::Arc;
use ra_syntax::{
AstNode, SourceFile, TreeArc, AstPtr,
ast::{self, ModuleItemOwner, NameOwner, AttrsOwner},
};
use ra_arena::{Arena, RawId, impl_arena_id, map::ArenaMap};
use rustc_hash::FxHashMap;
use crate::{
SourceItemId, Path, ModuleSource, Name,
HirFileId, MacroCallLoc, AsName, PerNs, Function,
ModuleDef, Module, Struct, Enum, Const, Static, Trait, TypeAlias,
ids::LocationCtx, PersistentHirDatabase,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ImportId(RawId);
impl_arena_id!(ImportId);
#[derive(Debug, PartialEq, Eq)]
pub(super) struct ImportData {
pub(super) path: Path,
pub(super) alias: Option<Name>,
pub(super) is_glob: bool,
pub(super) is_prelude: bool,
pub(super) is_extern_crate: bool,
}
/// A set of items and imports declared inside a module, without relation to
/// other modules.
///
/// This sits in-between raw syntax and name resolution and allows us to avoid
/// recomputing name res: if two instance of `InputModuleItems` are the same, we
/// can avoid redoing name resolution.
#[derive(Debug, Default, PartialEq, Eq)]
pub struct LoweredModule {
pub(crate) declarations: FxHashMap<Name, PerNs<ModuleDef>>,
pub(super) imports: Arena<ImportId, ImportData>,
}
#[derive(Debug, Default, PartialEq, Eq)]
pub struct ImportSourceMap {
map: ArenaMap<ImportId, AstPtr<ast::PathSegment>>,
}
impl ImportSourceMap {
fn insert(&mut self, import: ImportId, segment: &ast::PathSegment) {
self.map.insert(import, AstPtr::new(segment))
}
pub fn get(&self, source: &ModuleSource, import: ImportId) -> TreeArc<ast::PathSegment> {
let file = match source {
ModuleSource::SourceFile(file) => &*file,
ModuleSource::Module(m) => m.syntax().ancestors().find_map(SourceFile::cast).unwrap(),
};
self.map[import].to_node(file).to_owned()
}
}
impl LoweredModule {
pub(crate) fn lower_module_module_query(
db: &impl PersistentHirDatabase,
module: Module,
) -> Arc<LoweredModule> {
db.lower_module(module).0
}
pub(crate) fn lower_module_source_map_query(
db: &impl PersistentHirDatabase,
module: Module,
) -> Arc<ImportSourceMap> {
db.lower_module(module).1
}
pub(crate) fn lower_module_query(
db: &impl PersistentHirDatabase,
module: Module,
) -> (Arc<LoweredModule>, Arc<ImportSourceMap>) {
let (file_id, source) = module.definition_source(db);
let file_id: HirFileId = file_id.into();
let mut source_map = ImportSourceMap::default();
let mut res = LoweredModule::default();
match source {
ModuleSource::SourceFile(it) => {
res.fill(&mut source_map, db, module, file_id, &mut it.items_with_macros())
}
ModuleSource::Module(it) => {
if let Some(item_list) = it.item_list() {
res.fill(
&mut source_map,
db,
module,
file_id,
&mut item_list.items_with_macros(),
)
}
}
};
(Arc::new(res), Arc::new(source_map))
}
fn fill(
&mut self,
source_map: &mut ImportSourceMap,
db: &impl PersistentHirDatabase,
module: Module,
file_id: HirFileId,
items: &mut Iterator<Item = ast::ItemOrMacro>,
) {
let file_items = db.file_items(file_id);
for item in items {
match item {
ast::ItemOrMacro::Item(it) => {
self.add_def_id(source_map, db, module, file_id, it);
}
ast::ItemOrMacro::Macro(macro_call) => {
let item_id = file_items.id_of_unchecked(macro_call.syntax());
let loc =
MacroCallLoc { module, source_item_id: SourceItemId { file_id, item_id } };
let id = loc.id(db);
let file_id = HirFileId::from(id);
//FIXME: expand recursively
for item in db.hir_parse(file_id).items() {
self.add_def_id(source_map, db, module, file_id, item);
}
}
}
}
}
fn add_def_id(
&mut self,
source_map: &mut ImportSourceMap,
db: &impl PersistentHirDatabase,
module: Module,
file_id: HirFileId,
item: &ast::ModuleItem,
) {
let ctx = LocationCtx::new(db, module, file_id);
match item.kind() {
ast::ModuleItemKind::StructDef(it) => {
if let Some(name) = it.name() {
let s = Struct { id: ctx.to_def(it) };
let s: ModuleDef = s.into();
self.declarations.insert(name.as_name(), PerNs::both(s, s));
}
}
ast::ModuleItemKind::EnumDef(it) => {
if let Some(name) = it.name() {
let e = Enum { id: ctx.to_def(it) };
let e: ModuleDef = e.into();
self.declarations.insert(name.as_name(), PerNs::types(e));
}
}
ast::ModuleItemKind::FnDef(it) => {
if let Some(name) = it.name() {
let func = Function { id: ctx.to_def(it) };
self.declarations.insert(name.as_name(), PerNs::values(func.into()));
}
}
ast::ModuleItemKind::TraitDef(it) => {
if let Some(name) = it.name() {
let t = Trait { id: ctx.to_def(it) };
self.declarations.insert(name.as_name(), PerNs::types(t.into()));
}
}
ast::ModuleItemKind::TypeAliasDef(it) => {
if let Some(name) = it.name() {
let t = TypeAlias { id: ctx.to_def(it) };
self.declarations.insert(name.as_name(), PerNs::types(t.into()));
}
}
ast::ModuleItemKind::ImplBlock(_) => {
// impls don't define items
}
ast::ModuleItemKind::UseItem(it) => {
self.add_use_item(source_map, it);
}
ast::ModuleItemKind::ExternCrateItem(it) => {
if let Some(name_ref) = it.name_ref() {
let path = Path::from_name_ref(name_ref);
let alias = it.alias().and_then(|a| a.name()).map(AsName::as_name);
self.imports.alloc(ImportData {
path,
alias,
is_glob: false,
is_prelude: false,
is_extern_crate: true,
});
}
}
ast::ModuleItemKind::ConstDef(it) => {
if let Some(name) = it.name() {
let c = Const { id: ctx.to_def(it) };
self.declarations.insert(name.as_name(), PerNs::values(c.into()));
}
}
ast::ModuleItemKind::StaticDef(it) => {
if let Some(name) = it.name() {
let s = Static { id: ctx.to_def(it) };
self.declarations.insert(name.as_name(), PerNs::values(s.into()));
}
}
ast::ModuleItemKind::Module(_) => {
// modules are handled separately directly by name res
}
};
}
fn add_use_item(&mut self, source_map: &mut ImportSourceMap, item: &ast::UseItem) {
let is_prelude =
item.attrs().any(|attr| attr.as_atom().map(|s| s == "prelude_import").unwrap_or(false));
Path::expand_use_item(item, |path, segment, alias| {
let import = self.imports.alloc(ImportData {
path,
alias,
is_glob: segment.is_none(),
is_prelude,
is_extern_crate: false,
});
if let Some(segment) = segment {
source_map.insert(import, segment)
}
})
}
}
|
