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use std::sync::Arc;
use rustc_hash::FxHashMap;
use ra_arena::{Arena, RawId, impl_arena_id};
use ra_syntax::ast::{self, AstNode};
use ra_db::{LocationIntener, Cancelable, SourceRootId};
use crate::{
DefId, DefLoc, DefKind, SourceItemId, SourceFileItems,
Function,
db::HirDatabase,
type_ref::TypeRef,
module_tree::ModuleId,
};
use crate::code_model_api::{Module, ModuleSource};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ImplBlock {
module_impl_blocks: Arc<ModuleImplBlocks>,
impl_id: ImplId,
}
impl ImplBlock {
pub(crate) fn containing(
module_impl_blocks: Arc<ModuleImplBlocks>,
def_id: DefId,
) -> Option<ImplBlock> {
let impl_id = *module_impl_blocks.impls_by_def.get(&def_id)?;
Some(ImplBlock {
module_impl_blocks,
impl_id,
})
}
fn impl_data(&self) -> &ImplData {
&self.module_impl_blocks.impls[self.impl_id]
}
pub fn target_trait(&self) -> Option<&TypeRef> {
self.impl_data().target_trait.as_ref()
}
pub fn target_type(&self) -> &TypeRef {
&self.impl_data().target_type
}
pub fn items(&self) -> &[ImplItem] {
&self.impl_data().items
}
}
#[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 AsRef<LocationIntener<DefLoc, DefId>>,
file_items: &SourceFileItems,
module: &Module,
node: &ast::ImplBlock,
) -> Self {
let target_trait = node.target_type().map(TypeRef::from_ast);
let target_type = TypeRef::from_ast_opt(node.target_type());
let module_loc = module.def_id.loc(db);
let items = if let Some(item_list) = node.item_list() {
item_list
.impl_items()
.map(|item_node| {
let kind = match item_node.kind() {
ast::ImplItemKind::FnDef(..) => DefKind::Function,
ast::ImplItemKind::ConstDef(..) => DefKind::Item,
ast::ImplItemKind::TypeDef(..) => DefKind::Item,
};
let item_id = file_items.id_of_unchecked(item_node.syntax());
let source_item_id = SourceItemId {
file_id: module_loc.source_item_id.file_id,
item_id: Some(item_id),
};
let def_loc = DefLoc {
kind,
source_item_id,
..module_loc
};
let def_id = def_loc.id(db);
match item_node.kind() {
ast::ImplItemKind::FnDef(..) => ImplItem::Method(Function::new(def_id)),
ast::ImplItemKind::ConstDef(..) => ImplItem::Const(def_id),
ast::ImplItemKind::TypeDef(..) => ImplItem::Type(def_id),
}
})
.collect()
} else {
Vec::new()
};
ImplData {
target_trait,
target_type,
items,
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ImplItem {
Method(Function),
// these don't have their own types yet
Const(DefId),
Type(DefId),
// Existential
}
impl ImplItem {
pub fn def_id(&self) -> DefId {
match self {
ImplItem::Method(f) => f.def_id(),
ImplItem::Const(def_id) => *def_id,
ImplItem::Type(def_id) => *def_id,
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct ImplId(pub RawId);
impl_arena_id!(ImplId);
/// 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 someone
/// types in any file; as long as the impl blocks in the file don't change, we
/// don't need to do the second step again.
///
/// (The second step does not yet exist currently.)
#[derive(Debug, PartialEq, Eq)]
pub struct ModuleImplBlocks {
impls: Arena<ImplId, ImplData>,
impls_by_def: FxHashMap<DefId, ImplId>,
}
impl ModuleImplBlocks {
fn new() -> Self {
ModuleImplBlocks {
impls: Arena::default(),
impls_by_def: FxHashMap::default(),
}
}
fn collect(&mut self, db: &impl HirDatabase, module: Module) -> Cancelable<()> {
let (file_id, module_source) = module.defenition_source(db)?;
let node = match &module_source {
ModuleSource::SourceFile(node) => node.syntax(),
ModuleSource::Module(node) => node.syntax(),
};
let source_file_items = db.file_items(file_id.into());
for impl_block_ast in node.children().filter_map(ast::ImplBlock::cast) {
let impl_block = ImplData::from_ast(db, &source_file_items, &module, impl_block_ast);
let id = self.impls.alloc(impl_block);
for impl_item in &self.impls[id].items {
self.impls_by_def.insert(impl_item.def_id(), id);
}
}
Ok(())
}
}
pub(crate) fn impls_in_module(
db: &impl HirDatabase,
source_root_id: SourceRootId,
module_id: ModuleId,
) -> Cancelable<Arc<ModuleImplBlocks>> {
let mut result = ModuleImplBlocks::new();
let module = Module::from_module_id(db, source_root_id, module_id)?;
result.collect(db, module)?;
Ok(Arc::new(result))
}
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