132 lines
4.2 KiB
Rust
132 lines
4.2 KiB
Rust
//! FIXME: write short doc here
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use either::Either;
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use hir_def::{
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nameres::ModuleSource,
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src::{HasChildSource, HasSource as _},
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AstItemDef, Lookup, VariantId,
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};
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use ra_syntax::ast;
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use crate::{
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db::DefDatabase, Const, Enum, EnumVariant, FieldSource, Function, ImplBlock, Import, MacroDef,
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Module, Static, Struct, StructField, Trait, TypeAlias, Union,
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};
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pub use hir_expand::InFile;
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pub trait HasSource {
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type Ast;
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fn source(self, db: &impl DefDatabase) -> InFile<Self::Ast>;
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}
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/// NB: Module is !HasSource, because it has two source nodes at the same time:
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/// definition and declaration.
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impl Module {
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/// Returns a node which defines this module. That is, a file or a `mod foo {}` with items.
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pub fn definition_source(self, db: &impl DefDatabase) -> InFile<ModuleSource> {
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let def_map = db.crate_def_map(self.id.krate);
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def_map[self.id.local_id].definition_source(db)
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}
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/// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
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/// `None` for the crate root.
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pub fn declaration_source(self, db: &impl DefDatabase) -> Option<InFile<ast::Module>> {
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let def_map = db.crate_def_map(self.id.krate);
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def_map[self.id.local_id].declaration_source(db)
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}
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}
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impl HasSource for StructField {
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type Ast = FieldSource;
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fn source(self, db: &impl DefDatabase) -> InFile<FieldSource> {
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let var = VariantId::from(self.parent);
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let src = var.child_source(db);
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src.map(|it| match it[self.id].clone() {
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Either::Left(it) => FieldSource::Pos(it),
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Either::Right(it) => FieldSource::Named(it),
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})
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}
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}
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impl HasSource for Struct {
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type Ast = ast::StructDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::StructDef> {
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self.id.source(db)
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}
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}
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impl HasSource for Union {
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type Ast = ast::UnionDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::UnionDef> {
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self.id.source(db)
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}
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}
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impl HasSource for Enum {
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type Ast = ast::EnumDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::EnumDef> {
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self.id.source(db)
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}
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}
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impl HasSource for EnumVariant {
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type Ast = ast::EnumVariant;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::EnumVariant> {
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self.parent.id.child_source(db).map(|map| map[self.id].clone())
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}
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}
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impl HasSource for Function {
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type Ast = ast::FnDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::FnDef> {
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self.id.lookup(db).source(db)
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}
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}
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impl HasSource for Const {
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type Ast = ast::ConstDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::ConstDef> {
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self.id.lookup(db).source(db)
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}
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}
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impl HasSource for Static {
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type Ast = ast::StaticDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::StaticDef> {
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self.id.lookup(db).source(db)
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}
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}
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impl HasSource for Trait {
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type Ast = ast::TraitDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::TraitDef> {
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self.id.source(db)
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}
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}
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impl HasSource for TypeAlias {
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type Ast = ast::TypeAliasDef;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::TypeAliasDef> {
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self.id.lookup(db).source(db)
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}
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}
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impl HasSource for MacroDef {
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type Ast = ast::MacroCall;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::MacroCall> {
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InFile {
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file_id: self.id.ast_id.expect("MacroDef without ast_id").file_id,
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value: self.id.ast_id.expect("MacroDef without ast_id").to_node(db),
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}
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}
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}
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impl HasSource for ImplBlock {
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type Ast = ast::ImplBlock;
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fn source(self, db: &impl DefDatabase) -> InFile<ast::ImplBlock> {
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self.id.source(db)
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}
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}
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impl HasSource for Import {
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type Ast = Either<ast::UseTree, ast::ExternCrateItem>;
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/// Returns the syntax of the last path segment corresponding to this import
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fn source(self, db: &impl DefDatabase) -> InFile<Self::Ast> {
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let src = self.parent.definition_source(db);
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let (_, source_map) = db.raw_items_with_source_map(src.file_id);
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let root = db.parse_or_expand(src.file_id).unwrap();
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let ptr = source_map.get(self.id);
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src.with_value(ptr.map_left(|it| it.to_node(&root)).map_right(|it| it.to_node(&root)))
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}
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}
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