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use ra_syntax::{ast, TreeArc};
use crate::{
ids::AstItemDef, AstDatabase, Const, DefDatabase, Enum, EnumVariant, FieldSource, Function,
HirFileId, MacroDef, Module, ModuleSource, Static, Struct, StructField, Trait, TypeAlias,
Union,
};
pub struct Source<T> {
pub file_id: HirFileId,
pub ast: T,
}
pub trait HasSource {
type Ast;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<Self::Ast>;
}
/// NB: Module is !HasSource, because it has two source nodes at the same time:
/// definition and declaration.
impl Module {
/// Returns a node which defines this module. That is, a file or a `mod foo {}` with items.
pub fn definition_source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ModuleSource> {
let def_map = db.crate_def_map(self.krate);
let decl_id = def_map[self.module_id].declaration;
let file_id = def_map[self.module_id].definition;
let ast = ModuleSource::new(db, file_id, decl_id);
let file_id = file_id.map(HirFileId::from).unwrap_or_else(|| decl_id.unwrap().file_id());
Source { file_id, ast }
}
/// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
/// `None` for the crate root.
pub fn declaration_source(
self,
db: &(impl DefDatabase + AstDatabase),
) -> Option<Source<TreeArc<ast::Module>>> {
let def_map = db.crate_def_map(self.krate);
let decl = def_map[self.module_id].declaration?;
let ast = decl.to_node(db);
Some(Source { file_id: decl.file_id(), ast })
}
}
impl HasSource for StructField {
type Ast = FieldSource;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<FieldSource> {
self.source_impl(db)
}
}
impl HasSource for Struct {
type Ast = TreeArc<ast::StructDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::StructDef>> {
self.id.source(db)
}
}
impl HasSource for Union {
type Ast = TreeArc<ast::StructDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::StructDef>> {
self.id.source(db)
}
}
impl HasSource for Enum {
type Ast = TreeArc<ast::EnumDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::EnumDef>> {
self.id.source(db)
}
}
impl HasSource for EnumVariant {
type Ast = TreeArc<ast::EnumVariant>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::EnumVariant>> {
self.source_impl(db)
}
}
impl HasSource for Function {
type Ast = TreeArc<ast::FnDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::FnDef>> {
self.id.source(db)
}
}
impl HasSource for Const {
type Ast = TreeArc<ast::ConstDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::ConstDef>> {
self.id.source(db)
}
}
impl HasSource for Static {
type Ast = TreeArc<ast::StaticDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::StaticDef>> {
self.id.source(db)
}
}
impl HasSource for Trait {
type Ast = TreeArc<ast::TraitDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::TraitDef>> {
self.id.source(db)
}
}
impl HasSource for TypeAlias {
type Ast = TreeArc<ast::TypeAliasDef>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::TypeAliasDef>> {
self.id.source(db)
}
}
impl HasSource for MacroDef {
type Ast = TreeArc<ast::MacroCall>;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<TreeArc<ast::MacroCall>> {
Source { file_id: self.id.0.file_id(), ast: self.id.0.to_node(db) }
}
}
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