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|
use ra_syntax::ast::{self, AstNode};
use crate::{
ids::AstItemDef, AstDatabase, Const, DefDatabase, Enum, EnumVariant, FieldSource, Function,
HasBody, HirDatabase, 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<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 = ast::StructDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StructDef> {
self.id.source(db)
}
}
impl HasSource for Union {
type Ast = ast::StructDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StructDef> {
self.id.source(db)
}
}
impl HasSource for Enum {
type Ast = ast::EnumDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::EnumDef> {
self.id.source(db)
}
}
impl HasSource for EnumVariant {
type Ast = ast::EnumVariant;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::EnumVariant> {
self.source_impl(db)
}
}
impl HasSource for Function {
type Ast = ast::FnDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::FnDef> {
self.id.source(db)
}
}
impl HasSource for Const {
type Ast = ast::ConstDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::ConstDef> {
self.id.source(db)
}
}
impl HasSource for Static {
type Ast = ast::StaticDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StaticDef> {
self.id.source(db)
}
}
impl HasSource for Trait {
type Ast = ast::TraitDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::TraitDef> {
self.id.source(db)
}
}
impl HasSource for TypeAlias {
type Ast = ast::TypeAliasDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::TypeAliasDef> {
self.id.source(db)
}
}
impl HasSource for MacroDef {
type Ast = ast::MacroCall;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::MacroCall> {
Source { file_id: self.id.0.file_id(), ast: self.id.0.to_node(db) }
}
}
pub trait HasBodySource: HasBody + HasSource
where
Self::Ast: AstNode,
{
fn expr_source(
self,
db: &impl HirDatabase,
expr_id: crate::expr::ExprId,
) -> Option<Source<ast::Expr>> {
let source_map = self.body_source_map(db);
let expr_syntax = source_map.expr_syntax(expr_id)?;
let source = self.source(db);
let node = expr_syntax.to_node(&source.ast.syntax());
ast::Expr::cast(node).map(|ast| Source { file_id: source.file_id, ast })
}
}
impl<T> HasBodySource for T
where
T: HasBody + HasSource,
T::Ast: AstNode,
{
}
|
