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|
//! FIXME: write short doc here
use ra_syntax::ast::{self, AstNode};
use crate::{
adt::VariantDef,
db::{AstDatabase, DefDatabase, HirDatabase},
ids::AstItemDef,
Const, Either, Enum, EnumVariant, FieldSource, Function, HasBody, HirFileId, 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 + 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.id.module_id].declaration;
let file_id = def_map[self.id.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.id.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> {
let var_data = self.parent.variant_data(db);
let fields = var_data.fields().unwrap();
let ss;
let es;
let (file_id, struct_kind) = match self.parent {
VariantDef::Struct(s) => {
ss = s.source(db);
(ss.file_id, ss.ast.kind())
}
VariantDef::EnumVariant(e) => {
es = e.source(db);
(es.file_id, es.ast.kind())
}
};
let field_sources = match struct_kind {
ast::StructKind::Tuple(fl) => fl.fields().map(|it| FieldSource::Pos(it)).collect(),
ast::StructKind::Named(fl) => fl.fields().map(|it| FieldSource::Named(it)).collect(),
ast::StructKind::Unit => Vec::new(),
};
let ast = field_sources
.into_iter()
.zip(fields.iter())
.find(|(_syntax, (id, _))| *id == self.id)
.unwrap()
.0;
Source { file_id, ast }
}
}
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> {
let enum_data = db.enum_data(self.parent.id);
let src = self.parent.id.source(db);
let ast = src
.ast
.variant_list()
.into_iter()
.flat_map(|it| it.variants())
.zip(enum_data.variants.iter())
.find(|(_syntax, (id, _))| *id == self.id)
.unwrap()
.0;
Source { file_id: src.file_id, ast }
}
}
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.ast_id.file_id(), ast: self.id.ast_id.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<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,
{
}
|
