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use std::sync::Arc;
use rustc_hash::FxHashMap;
use ra_arena::{Arena, RawId, impl_arena_id, map::ArenaMap};
use ra_syntax::{
AstPtr, SourceFile, TreeArc,
ast::{self, AstNode}
};
use crate::{
Const, TypeAlias, Function, HirFileId,
HirDatabase, PersistentHirDatabase,
ModuleDef, Trait, Resolution,
type_ref::TypeRef,
ids::LocationCtx,
resolve::Resolver,
ty::Ty, generics::GenericParams,
};
use crate::code_model_api::{Module, ModuleSource};
#[derive(Debug, Default, PartialEq, Eq)]
pub struct ImplSourceMap {
map: ArenaMap<ImplId, AstPtr<ast::ImplBlock>>,
}
impl ImplSourceMap {
fn insert(&mut self, impl_id: ImplId, impl_block: &ast::ImplBlock) {
self.map.insert(impl_id, AstPtr::new(impl_block))
}
pub fn get(&self, source: &ModuleSource, impl_id: ImplId) -> TreeArc<ast::ImplBlock> {
let file = match source {
ModuleSource::SourceFile(file) => &*file,
ModuleSource::Module(m) => m.syntax().ancestors().find_map(SourceFile::cast).unwrap(),
};
self.map[impl_id].to_node(file).to_owned()
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct ImplBlock {
module: Module,
impl_id: ImplId,
}
impl ImplBlock {
pub(crate) fn containing(
module_impl_blocks: Arc<ModuleImplBlocks>,
item: ImplItem,
) -> Option<ImplBlock> {
let impl_id = *module_impl_blocks.impls_by_def.get(&item)?;
Some(ImplBlock { module: module_impl_blocks.module, impl_id })
}
pub(crate) fn from_id(module: Module, impl_id: ImplId) -> ImplBlock {
ImplBlock { module, impl_id }
}
/// Returns the syntax of the impl block
pub fn source(&self, db: &impl PersistentHirDatabase) -> (HirFileId, TreeArc<ast::ImplBlock>) {
let source_map = db.impls_in_module_source_map(self.module);
let (file_id, source) = self.module.definition_source(db);
(file_id, source_map.get(&source, self.impl_id))
}
pub fn id(&self) -> ImplId {
self.impl_id
}
pub fn module(&self) -> Module {
self.module
}
pub fn target_trait_ref(&self, db: &impl PersistentHirDatabase) -> Option<TypeRef> {
db.impls_in_module(self.module).impls[self.impl_id].target_trait().cloned()
}
pub fn target_type(&self, db: &impl PersistentHirDatabase) -> TypeRef {
db.impls_in_module(self.module).impls[self.impl_id].target_type().clone()
}
pub fn target_ty(&self, db: &impl HirDatabase) -> Ty {
Ty::from_hir(db, &self.resolver(db), &self.target_type(db))
}
pub fn target_trait(&self, db: &impl HirDatabase) -> Option<Trait> {
if let Some(TypeRef::Path(path)) = self.target_trait_ref(db) {
let resolver = self.resolver(db);
if let Some(Resolution::Def(ModuleDef::Trait(tr))) =
resolver.resolve_path(db, &path).take_types()
{
return Some(tr);
}
}
None
}
pub fn items(&self, db: &impl PersistentHirDatabase) -> Vec<ImplItem> {
db.impls_in_module(self.module).impls[self.impl_id].items().to_vec()
}
pub fn generic_params(&self, db: &impl PersistentHirDatabase) -> Arc<GenericParams> {
db.generic_params((*self).into())
}
pub fn resolver(&self, db: &impl HirDatabase) -> Resolver {
let r = self.module().resolver(db);
// add generic params, if present
let p = self.generic_params(db);
let r = if !p.params.is_empty() { r.push_generic_params_scope(p) } else { r };
let r = r.push_impl_block_scope(self.clone());
r
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ImplData {
target_trait: Option<TypeRef>,
target_type: TypeRef,
items: Vec<ImplItem>,
}
impl ImplData {
pub(crate) fn from_ast(
db: &impl PersistentHirDatabase,
file_id: HirFileId,
module: Module,
node: &ast::ImplBlock,
) -> Self {
let target_trait = node.target_trait().map(TypeRef::from_ast);
let target_type = TypeRef::from_ast_opt(node.target_type());
let ctx = LocationCtx::new(db, module, file_id);
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()
};
ImplData { target_trait, target_type, items }
}
pub fn target_trait(&self) -> Option<&TypeRef> {
self.target_trait.as_ref()
}
pub fn target_type(&self) -> &TypeRef {
&self.target_type
}
pub fn items(&self) -> &[ImplItem] {
&self.items
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
//FIXME: rename to ImplDef?
pub enum ImplItem {
Method(Function),
Const(Const),
TypeAlias(TypeAlias),
// Existential
}
impl_froms!(ImplItem: Const, TypeAlias);
impl From<Function> for ImplItem {
fn from(func: Function) -> ImplItem {
ImplItem::Method(func)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct ImplId(pub RawId);
impl_arena_id!(ImplId);
/// The collection of impl blocks is a two-step process: first we collect the
/// blocks per-module; then we build an index of all impl blocks in the crate.
/// This way, we avoid having to do this process for the whole crate whenever
/// a file is changed; as long as the impl blocks in the file don't change,
/// we don't need to do the second step again.
#[derive(Debug, PartialEq, Eq)]
pub struct ModuleImplBlocks {
pub(crate) module: Module,
pub(crate) impls: Arena<ImplId, ImplData>,
impls_by_def: FxHashMap<ImplItem, ImplId>,
}
impl ModuleImplBlocks {
fn collect(
db: &impl PersistentHirDatabase,
module: Module,
source_map: &mut ImplSourceMap,
) -> Self {
let mut m = ModuleImplBlocks {
module,
impls: Arena::default(),
impls_by_def: FxHashMap::default(),
};
let (file_id, module_source) = m.module.definition_source(db);
let file_id: HirFileId = file_id.into();
let node = match &module_source {
ModuleSource::SourceFile(node) => node.syntax(),
ModuleSource::Module(node) => {
node.item_list().expect("inline module should have item list").syntax()
}
};
for impl_block_ast in node.children().filter_map(ast::ImplBlock::cast) {
let impl_block = ImplData::from_ast(db, file_id, m.module, impl_block_ast);
let id = m.impls.alloc(impl_block);
for &impl_item in &m.impls[id].items {
m.impls_by_def.insert(impl_item, id);
}
source_map.insert(id, impl_block_ast);
}
m
}
}
pub(crate) fn impls_in_module_with_source_map_query(
db: &impl PersistentHirDatabase,
module: Module,
) -> (Arc<ModuleImplBlocks>, Arc<ImplSourceMap>) {
let mut source_map = ImplSourceMap::default();
let result = ModuleImplBlocks::collect(db, module, &mut source_map);
(Arc::new(result), Arc::new(source_map))
}
pub(crate) fn impls_in_module(
db: &impl PersistentHirDatabase,
module: Module,
) -> Arc<ModuleImplBlocks> {
db.impls_in_module_with_source_map(module).0
}
pub(crate) fn impls_in_module_source_map_query(
db: &impl PersistentHirDatabase,
module: Module,
) -> Arc<ImplSourceMap> {
db.impls_in_module_with_source_map(module).1
}
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