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use either::Either;
use hir_def::{
attr::{AttrsWithOwner, Documentation},
item_scope::ItemInNs,
path::ModPath,
per_ns::PerNs,
resolver::HasResolver,
AttrDefId, GenericParamId, ModuleDefId,
};
use hir_expand::{hygiene::Hygiene, MacroDefId};
use hir_ty::db::HirDatabase;
use syntax::ast;
use crate::{
Adt, AssocItem, Const, ConstParam, Enum, Field, Function, GenericParam, Impl, LifetimeParam,
MacroDef, Module, ModuleDef, Static, Struct, Trait, TypeAlias, TypeParam, Union, Variant,
};
pub trait HasAttrs {
fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner;
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation>;
fn resolve_doc_path(
self,
db: &dyn HirDatabase,
link: &str,
ns: Option<Namespace>,
) -> Option<Either<ModuleDef, MacroDef>>;
}
#[derive(PartialEq, Eq, Hash, Copy, Clone, Debug)]
pub enum Namespace {
Types,
Values,
Macros,
}
macro_rules! impl_has_attrs {
($(($def:ident, $def_id:ident),)*) => {$(
impl HasAttrs for $def {
fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner {
let def = AttrDefId::$def_id(self.into());
db.attrs(def)
}
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
let def = AttrDefId::$def_id(self.into());
db.attrs(def).docs()
}
fn resolve_doc_path(self, db: &dyn HirDatabase, link: &str, ns: Option<Namespace>) -> Option<Either<ModuleDef, MacroDef>> {
let def = AttrDefId::$def_id(self.into());
resolve_doc_path(db, def, link, ns).map(|it| it.map_left(ModuleDef::from).map_right(MacroDef::from))
}
}
)*};
}
impl_has_attrs![
(Field, FieldId),
(Variant, EnumVariantId),
(Static, StaticId),
(Const, ConstId),
(Trait, TraitId),
(TypeAlias, TypeAliasId),
(MacroDef, MacroDefId),
(Function, FunctionId),
(Adt, AdtId),
(Module, ModuleId),
(GenericParam, GenericParamId),
(Impl, ImplId),
];
macro_rules! impl_has_attrs_enum {
($($variant:ident),* for $enum:ident) => {$(
impl HasAttrs for $variant {
fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner {
$enum::$variant(self).attrs(db)
}
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
$enum::$variant(self).docs(db)
}
fn resolve_doc_path(self, db: &dyn HirDatabase, link: &str, ns: Option<Namespace>) -> Option<Either<ModuleDef, MacroDef>> {
$enum::$variant(self).resolve_doc_path(db, link, ns)
}
}
)*};
}
impl_has_attrs_enum![Struct, Union, Enum for Adt];
impl_has_attrs_enum![TypeParam, ConstParam, LifetimeParam for GenericParam];
impl HasAttrs for AssocItem {
fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner {
match self {
AssocItem::Function(it) => it.attrs(db),
AssocItem::Const(it) => it.attrs(db),
AssocItem::TypeAlias(it) => it.attrs(db),
}
}
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
match self {
AssocItem::Function(it) => it.docs(db),
AssocItem::Const(it) => it.docs(db),
AssocItem::TypeAlias(it) => it.docs(db),
}
}
fn resolve_doc_path(
self,
db: &dyn HirDatabase,
link: &str,
ns: Option<Namespace>,
) -> Option<Either<ModuleDef, MacroDef>> {
match self {
AssocItem::Function(it) => it.resolve_doc_path(db, link, ns),
AssocItem::Const(it) => it.resolve_doc_path(db, link, ns),
AssocItem::TypeAlias(it) => it.resolve_doc_path(db, link, ns),
}
}
}
fn resolve_doc_path(
db: &dyn HirDatabase,
def: AttrDefId,
link: &str,
ns: Option<Namespace>,
) -> Option<Either<ModuleDefId, MacroDefId>> {
let resolver = match def {
AttrDefId::ModuleId(it) => it.resolver(db.upcast()),
AttrDefId::FieldId(it) => it.parent.resolver(db.upcast()),
AttrDefId::AdtId(it) => it.resolver(db.upcast()),
AttrDefId::FunctionId(it) => it.resolver(db.upcast()),
AttrDefId::EnumVariantId(it) => it.parent.resolver(db.upcast()),
AttrDefId::StaticId(it) => it.resolver(db.upcast()),
AttrDefId::ConstId(it) => it.resolver(db.upcast()),
AttrDefId::TraitId(it) => it.resolver(db.upcast()),
AttrDefId::TypeAliasId(it) => it.resolver(db.upcast()),
AttrDefId::ImplId(it) => it.resolver(db.upcast()),
AttrDefId::GenericParamId(it) => match it {
GenericParamId::TypeParamId(it) => it.parent,
GenericParamId::LifetimeParamId(it) => it.parent,
GenericParamId::ConstParamId(it) => it.parent,
}
.resolver(db.upcast()),
AttrDefId::MacroDefId(_) => return None,
};
let path = ast::Path::parse(link).ok()?;
let modpath = ModPath::from_src(db.upcast(), path, &Hygiene::new_unhygienic()).unwrap();
let resolved = resolver.resolve_module_path_in_items(db.upcast(), &modpath);
let resolved = if resolved == PerNs::none() {
resolver.resolve_module_path_in_trait_assoc_items(db.upcast(), &modpath)?
} else {
resolved
};
match ns {
Some(Namespace::Types) => resolved.take_types().map(Either::Left),
Some(Namespace::Values) => resolved.take_values().map(Either::Left),
Some(Namespace::Macros) => resolved.take_macros().map(Either::Right),
None => resolved.iter_items().next().map(|it| match it {
ItemInNs::Types(it) => Either::Left(it),
ItemInNs::Values(it) => Either::Left(it),
ItemInNs::Macros(it) => Either::Right(it),
}),
}
}