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//! Provides set of implementation for hir's objects that allows get back location in file.
use either::Either;
use hir_def::{
nameres::{ModuleOrigin, ModuleSource},
src::{HasChildSource, HasSource as _},
Lookup, VariantId,
};
use hir_expand::InFile;
use syntax::ast;
use crate::{
db::HirDatabase, Const, ConstParam, Enum, Field, FieldSource, Function, Impl, LifetimeParam,
MacroDef, Module, Static, Struct, Trait, TypeAlias, TypeParam, Union, Variant,
};
pub trait HasSource {
type Ast;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<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: &dyn HirDatabase) -> InFile<ModuleSource> {
let def_map = self.id.def_map(db.upcast());
def_map[self.id.local_id].definition_source(db.upcast())
}
pub fn is_mod_rs(self, db: &dyn HirDatabase) -> bool {
let def_map = self.id.def_map(db.upcast());
match def_map[self.id.local_id].origin {
ModuleOrigin::File { is_mod_rs, .. } => is_mod_rs,
_ => false,
}
}
/// 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: &dyn HirDatabase) -> Option<InFile<ast::Module>> {
let def_map = self.id.def_map(db.upcast());
def_map[self.id.local_id].declaration_source(db.upcast())
}
}
impl HasSource for Field {
type Ast = FieldSource;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
let var = VariantId::from(self.parent);
let src = var.child_source(db.upcast());
let field_source = src.map(|it| match it[self.id].clone() {
Either::Left(it) => FieldSource::Pos(it),
Either::Right(it) => FieldSource::Named(it),
});
Some(field_source)
}
}
impl HasSource for Struct {
type Ast = ast::Struct;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Union {
type Ast = ast::Union;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Enum {
type Ast = ast::Enum;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Variant {
type Ast = ast::Variant;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<ast::Variant>> {
Some(self.parent.id.child_source(db.upcast()).map(|map| map[self.id].clone()))
}
}
impl HasSource for Function {
type Ast = ast::Fn;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Const {
type Ast = ast::Const;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Static {
type Ast = ast::Static;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for Trait {
type Ast = ast::Trait;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for TypeAlias {
type Ast = ast::TypeAlias;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for MacroDef {
type Ast = Either<ast::Macro, ast::Fn>;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.ast_id().either(
|id| id.with_value(Either::Left(id.to_node(db.upcast()))),
|id| id.with_value(Either::Right(id.to_node(db.upcast()))),
))
}
}
impl HasSource for Impl {
type Ast = ast::Impl;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.id.lookup(db.upcast()).source(db.upcast()))
}
}
impl HasSource for TypeParam {
type Ast = Either<ast::TypeParam, ast::Trait>;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
let child_source = self.id.parent.child_source(db.upcast());
Some(child_source.map(|it| it[self.id.local_id].clone()))
}
}
impl HasSource for LifetimeParam {
type Ast = ast::LifetimeParam;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
let child_source = self.id.parent.child_source(db.upcast());
Some(child_source.map(|it| it[self.id.local_id].clone()))
}
}
impl HasSource for ConstParam {
type Ast = ast::ConstParam;
fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
let child_source = self.id.parent.child_source(db.upcast());
Some(child_source.map(|it| it[self.id.local_id].clone()))
}
}
|
