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//! Attributes & documentation for hir types.
use hir_def::{
attr::{Attrs, Documentation},
path::ModPath,
resolver::HasResolver,
AttrDefId, ModuleDefId,
};
use hir_expand::hygiene::Hygiene;
use hir_ty::db::HirDatabase;
use syntax::ast;
use crate::{
Adt, Const, Enum, Field, Function, MacroDef, Module, ModuleDef, Static, Struct, Trait,
TypeAlias, Union, Variant,
};
pub trait HasAttrs {
fn attrs(self, db: &dyn HirDatabase) -> Attrs;
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation>;
fn resolve_doc_path(
self,
db: &dyn HirDatabase,
link: &str,
ns: Option<Namespace>,
) -> Option<ModuleDef>;
}
#[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 $def {
fn attrs(self, db: &dyn HirDatabase) -> Attrs {
let def = AttrDefId::$def_id(self.into());
db.attrs(def)
}
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
let def = AttrDefId::$def_id(self.into());
db.attrs(def).docs()
}
fn resolve_doc_path(self, db: &dyn HirDatabase, link: &str, ns: Option<Namespace>) -> Option<ModuleDef> {
let def = AttrDefId::$def_id(self.into());
resolve_doc_path(db, def, link, ns).map(ModuleDef::from)
}
}
)*};
}
impl_has_attrs![
(Field, FieldId),
(Variant, EnumVariantId),
(Static, StaticId),
(Const, ConstId),
(Trait, TraitId),
(TypeAlias, TypeAliasId),
(MacroDef, MacroDefId),
(Function, FunctionId),
(Adt, AdtId),
(Module, ModuleId),
];
macro_rules! impl_has_attrs_adt {
($($adt:ident),*) => {$(
impl HasAttrs for $adt {
fn attrs(self, db: &dyn HirDatabase) -> Attrs {
Adt::$adt(self).attrs(db)
}
fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
Adt::$adt(self).docs(db)
}
fn resolve_doc_path(self, db: &dyn HirDatabase, link: &str, ns: Option<Namespace>) -> Option<ModuleDef> {
Adt::$adt(self).resolve_doc_path(db, link, ns)
}
}
)*};
}
impl_has_attrs_adt![Struct, Union, Enum];
fn resolve_doc_path(
db: &dyn HirDatabase,
def: AttrDefId,
link: &str,
ns: Option<Namespace>,
) -> Option<ModuleDefId> {
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::MacroDefId(_) => return None,
};
let path = ast::Path::parse(link).ok()?;
let modpath = ModPath::from_src(path, &Hygiene::new_unhygienic()).unwrap();
let resolved = resolver.resolve_module_path_in_items(db.upcast(), &modpath);
let def = match ns {
Some(Namespace::Types) => resolved.take_types()?,
Some(Namespace::Values) => resolved.take_values()?,
Some(Namespace::Macros) => return None,
None => resolved.iter_items().find_map(|it| it.as_module_def_id())?,
};
Some(def.into())
}
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