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//! FIXME: write short doc here
use hir_def::{AstItemDef, HasChildSource, HasSource as _, Lookup, VariantId};
use hir_expand::either::Either;
use ra_syntax::ast::{self, AstNode};
use crate::{
db::{DefDatabase, HirDatabase},
Const, Enum, EnumVariant, FieldSource, Function, HasBody, Import, MacroDef, Module,
ModuleSource, Static, Struct, StructField, Trait, TypeAlias, Union,
};
pub use hir_expand::Source;
pub trait HasSource {
type Ast;
fn source(self, db: &impl DefDatabase) -> 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) -> Source<ModuleSource> {
let def_map = db.crate_def_map(self.id.krate);
let src = def_map[self.id.module_id].definition_source(db);
src.map(|it| match it {
Either::A(it) => ModuleSource::SourceFile(it),
Either::B(it) => ModuleSource::Module(it),
})
}
/// 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) -> Option<Source<ast::Module>> {
let def_map = db.crate_def_map(self.id.krate);
def_map[self.id.module_id].declaration_source(db)
}
}
impl HasSource for StructField {
type Ast = FieldSource;
fn source(self, db: &impl DefDatabase) -> Source<FieldSource> {
let var = VariantId::from(self.parent);
let src = var.child_source(db);
src.map(|it| match it[self.id].clone() {
Either::A(it) => FieldSource::Pos(it),
Either::B(it) => FieldSource::Named(it),
})
}
}
impl HasSource for Struct {
type Ast = ast::StructDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::StructDef> {
self.id.0.source(db)
}
}
impl HasSource for Union {
type Ast = ast::StructDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::StructDef> {
self.id.0.source(db)
}
}
impl HasSource for Enum {
type Ast = ast::EnumDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::EnumDef> {
self.id.source(db)
}
}
impl HasSource for EnumVariant {
type Ast = ast::EnumVariant;
fn source(self, db: &impl DefDatabase) -> Source<ast::EnumVariant> {
self.parent.id.child_source(db).map(|map| map[self.id].clone())
}
}
impl HasSource for Function {
type Ast = ast::FnDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::FnDef> {
self.id.lookup(db).source(db)
}
}
impl HasSource for Const {
type Ast = ast::ConstDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::ConstDef> {
self.id.lookup(db).source(db)
}
}
impl HasSource for Static {
type Ast = ast::StaticDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::StaticDef> {
self.id.lookup(db).source(db)
}
}
impl HasSource for Trait {
type Ast = ast::TraitDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::TraitDef> {
self.id.source(db)
}
}
impl HasSource for TypeAlias {
type Ast = ast::TypeAliasDef;
fn source(self, db: &impl DefDatabase) -> Source<ast::TypeAliasDef> {
self.id.lookup(db).source(db)
}
}
impl HasSource for MacroDef {
type Ast = ast::MacroCall;
fn source(self, db: &impl DefDatabase) -> Source<ast::MacroCall> {
Source { file_id: self.id.ast_id.file_id(), value: self.id.ast_id.to_node(db) }
}
}
impl HasSource for Import {
type Ast = Either<ast::UseTree, ast::ExternCrateItem>;
/// Returns the syntax of the last path segment corresponding to this import
fn source(self, db: &impl DefDatabase) -> Source<Self::Ast> {
let src = self.parent.definition_source(db);
let (_, source_map) = db.raw_items_with_source_map(src.file_id);
let root = db.parse_or_expand(src.file_id).unwrap();
let ptr = source_map.get(self.id);
src.with_value(ptr.map(|it| it.to_node(&root), |it| it.to_node(&root)))
}
}
pub trait HasBodySource: HasBody + HasSource
where
Self::Ast: AstNode,
{
fn expr_source(
self,
db: &impl HirDatabase,
expr_id: crate::expr::ExprId,
) -> Option<Source<Either<ast::Expr, ast::RecordField>>> {
let source_map = self.body_source_map(db);
let source_ptr = source_map.expr_syntax(expr_id)?;
let root = source_ptr.file_syntax(db);
let source = source_ptr.map(|ast| ast.map(|it| it.to_node(&root), |it| it.to_node(&root)));
Some(source)
}
}
impl<T> HasBodySource for T
where
T: HasBody + HasSource,
T::Ast: AstNode,
{
}
|
