Simplify

5 files changed, 157 insertions, 156 deletions

diff --git a/crates/hir/src/attrs.rs b/crates/hir/src/attrs.rs
index 2e3c46fdd4c..796490abd7f 100644
--- a/crates/hir/src/attrs.rs
+++ b/crates/hir/src/attrs.rs
@@ -6,33 +6,22 @@ use hir_def::{
     path::{ModPath, Path},
     per_ns::Namespace,
     resolver::{HasResolver, Resolver, TypeNs},
-    AssocItemId, AttrDefId, GenericParamId, ModuleDefId,
+    AssocItemId, AttrDefId, ModuleDefId,
 };
 use hir_expand::{hygiene::Hygiene, name::Name};
 use hir_ty::db::HirDatabase;
 use syntax::{ast, AstNode};
 
 use crate::{
-    Adt, AsAssocItem, AssocItem, BuiltinType, Const, ConstParam, Enum, ExternCrateDecl, Field,
-    Function, GenericParam, Impl, LifetimeParam, Macro, Module, ModuleDef, Static, Struct, Trait,
-    TraitAlias, TypeAlias, TypeParam, Union, Variant, VariantDef,
+    Adt, AsAssocItem, AssocItem, BuiltinType, Const, ConstParam, DocLinkDef, Enum, ExternCrateDecl,
+    Field, Function, GenericParam, Impl, LifetimeParam, Macro, Module, ModuleDef, Static, Struct,
+    Trait, TraitAlias, TypeAlias, TypeParam, Union, Variant, VariantDef,
 };
 
 pub trait HasAttrs {
     fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner;
-    fn resolve_doc_path(
-        self,
-        db: &dyn HirDatabase,
-        link: &str,
-        ns: Option<Namespace>,
-    ) -> Option<DocLinkDef>;
-}
-
-/// Subset of `ide_db::Definition` that doc links can resolve to.
-pub enum DocLinkDef {
-    ModuleDef(ModuleDef),
-    Field(Field),
-    SelfType(Trait),
+    #[doc(hidden)]
+    fn attr_id(self) -> AttrDefId;
 }
 
 macro_rules! impl_has_attrs {
@@ -42,14 +31,8 @@ macro_rules! impl_has_attrs {
                 let def = AttrDefId::$def_id(self.into());
                 db.attrs_with_owner(def)
             }
-            fn resolve_doc_path(
-                self,
-                db: &dyn HirDatabase,
-                link: &str,
-                ns: Option<Namespace>
-            ) -> Option<DocLinkDef> {
-                let def = AttrDefId::$def_id(self.into());
-                resolve_doc_path(db, def, link, ns)
+            fn attr_id(self) -> AttrDefId {
+                AttrDefId::$def_id(self.into())
             }
         }
     )*};
@@ -69,6 +52,7 @@ impl_has_attrs![
     (Module, ModuleId),
     (GenericParam, GenericParamId),
     (Impl, ImplId),
+    (ExternCrateDecl, ExternCrateId),
 ];
 
 macro_rules! impl_has_attrs_enum {
@@ -77,13 +61,8 @@ macro_rules! impl_has_attrs_enum {
             fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner {
                 $enum::$variant(self).attrs(db)
             }
-            fn resolve_doc_path(
-                self,
-                db: &dyn HirDatabase,
-                link: &str,
-                ns: Option<Namespace>
-            ) -> Option<DocLinkDef> {
-                $enum::$variant(self).resolve_doc_path(db, link, ns)
+            fn attr_id(self) -> AttrDefId {
+                $enum::$variant(self).attr_id()
             }
         }
     )*};
@@ -100,45 +79,35 @@ impl HasAttrs for AssocItem {
             AssocItem::TypeAlias(it) => it.attrs(db),
         }
     }
-
-    fn resolve_doc_path(
-        self,
-        db: &dyn HirDatabase,
-        link: &str,
-        ns: Option<Namespace>,
-    ) -> Option<DocLinkDef> {
+    fn attr_id(self) -> AttrDefId {
         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),
+            AssocItem::Function(it) => it.attr_id(),
+            AssocItem::Const(it) => it.attr_id(),
+            AssocItem::TypeAlias(it) => it.attr_id(),
         }
     }
 }
 
-impl HasAttrs for ExternCrateDecl {
-    fn attrs(self, db: &dyn HirDatabase) -> AttrsWithOwner {
-        let def = AttrDefId::ExternCrateId(self.into());
-        db.attrs_with_owner(def)
-    }
-    fn resolve_doc_path(
-        self,
-        db: &dyn HirDatabase,
-        link: &str,
-        ns: Option<Namespace>,
-    ) -> Option<DocLinkDef> {
-        let def = AttrDefId::ExternCrateId(self.into());
-        resolve_doc_path(db, def, link, ns)
-    }
+/// Resolves the item `link` points to in the scope of `def`.
+pub fn resolve_doc_path_on(
+    db: &dyn HirDatabase,
+    def: impl HasAttrs,
+    link: &str,
+    ns: Option<Namespace>,
+) -> Option<DocLinkDef> {
+    // AttrDefId::FieldId(it) => it.parent.resolver(db.upcast()),
+    // AttrDefId::EnumVariantId(it) => it.parent.resolver(db.upcast()),
+
+    resolve_doc_path_on_(db, link, def.attr_id(), ns)
 }
 
-/// Resolves the item `link` points to in the scope of `def`.
-fn resolve_doc_path(
+fn resolve_doc_path_on_(
     db: &dyn HirDatabase,
-    def: AttrDefId,
     link: &str,
+    attr_id: AttrDefId,
     ns: Option<Namespace>,
 ) -> Option<DocLinkDef> {
-    let resolver = match def {
+    let resolver = match attr_id {
         AttrDefId::ModuleId(it) => it.resolver(db.upcast()),
         AttrDefId::FieldId(it) => it.parent.resolver(db.upcast()),
         AttrDefId::AdtId(it) => it.resolver(db.upcast()),
@@ -154,12 +123,7 @@ fn resolve_doc_path(
         AttrDefId::UseId(it) => it.resolver(db.upcast()),
         AttrDefId::MacroId(it) => it.resolver(db.upcast()),
         AttrDefId::ExternCrateId(it) => it.resolver(db.upcast()),
-        AttrDefId::GenericParamId(it) => match it {
-            GenericParamId::TypeParamId(it) => it.parent(),
-            GenericParamId::ConstParamId(it) => it.parent(),
-            GenericParamId::LifetimeParamId(it) => it.parent,
-        }
-        .resolver(db.upcast()),
+        AttrDefId::GenericParamId(_) => return None,
     };
 
     let mut modpath = modpath_from_str(db, link)?;
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 4123b235a78..91443238c62 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -88,7 +88,7 @@ use triomphe::Arc;
 use crate::db::{DefDatabase, HirDatabase};
 
 pub use crate::{
-    attrs::{DocLinkDef, HasAttrs},
+    attrs::{resolve_doc_path_on, HasAttrs},
     diagnostics::{
         AnyDiagnostic, BreakOutsideOfLoop, CaseType, ExpectedFunction, InactiveCode,
         IncoherentImpl, IncorrectCase, InvalidDeriveTarget, MacroDefError, MacroError,
@@ -4839,3 +4839,10 @@ pub enum ItemContainer {
     ExternBlock(),
     Crate(CrateId),
 }
+
+/// Subset of `ide_db::Definition` that doc links can resolve to.
+pub enum DocLinkDef {
+    ModuleDef(ModuleDef),
+    Field(Field),
+    SelfType(Trait),
+}
diff --git a/crates/ide-db/src/documentation.rs b/crates/ide-db/src/documentation.rs
index 3e6b1cbc369..aa8a374218d 100644
--- a/crates/ide-db/src/documentation.rs
+++ b/crates/ide-db/src/documentation.rs
@@ -1,7 +1,7 @@
 use either::Either;
 use hir::{
     db::{DefDatabase, HirDatabase},
-    AttrId, AttrSourceMap, AttrsWithOwner, HasAttrs, InFile,
+    resolve_doc_path_on, AttrId, AttrSourceMap, AttrsWithOwner, HasAttrs, InFile,
 };
 use itertools::Itertools;
 use syntax::{
@@ -32,77 +32,13 @@ impl From<Documentation> for String {
 
 pub trait HasDocs: HasAttrs {
     fn docs(self, db: &dyn HirDatabase) -> Option<Documentation>;
+    fn resolve_doc_path(
+        self,
+        db: &dyn HirDatabase,
+        link: &str,
+        ns: Option<hir::Namespace>,
+    ) -> Option<hir::DocLinkDef>;
 }
-
-macro_rules! impl_has_docs {
-    ($($def:ident,)*) => {$(
-        impl HasDocs for hir::$def {
-            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
-                docs_from_attrs(&self.attrs(db)).map(Documentation)
-            }
-        }
-    )*};
-}
-
-impl_has_docs![
-    Field,
-    Variant,
-    Static,
-    Const,
-    Trait,
-    TraitAlias,
-    TypeAlias,
-    Macro,
-    Function,
-    Adt,
-    Module,
-    GenericParam,
-    Impl,
-];
-
-macro_rules! impl_has_docs_enum {
-    ($($variant:ident),* for $enum:ident) => {$(
-        impl HasDocs for hir::$variant {
-            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
-                hir::$enum::$variant(self).docs(db)
-            }
-        }
-    )*};
-}
-
-impl_has_docs_enum![Struct, Union, Enum for Adt];
-impl_has_docs_enum![TypeParam, ConstParam, LifetimeParam for GenericParam];
-
-impl HasDocs for hir::AssocItem {
-    fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
-        match self {
-            hir::AssocItem::Function(it) => it.docs(db),
-            hir::AssocItem::Const(it) => it.docs(db),
-            hir::AssocItem::TypeAlias(it) => it.docs(db),
-        }
-    }
-}
-
-impl HasDocs for hir::ExternCrateDecl {
-    fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
-        let crate_docs =
-            docs_from_attrs(&self.resolved_crate(db)?.root_module().attrs(db)).map(String::from);
-        let decl_docs = docs_from_attrs(&self.attrs(db)).map(String::from);
-        match (decl_docs, crate_docs) {
-            (None, None) => None,
-            (Some(decl_docs), None) => Some(decl_docs),
-            (None, Some(crate_docs)) => Some(crate_docs),
-            (Some(mut decl_docs), Some(crate_docs)) => {
-                decl_docs.push('\n');
-                decl_docs.push('\n');
-                decl_docs += &crate_docs;
-                Some(decl_docs)
-            }
-        }
-        .map(Documentation::new)
-    }
-}
-
 /// A struct to map text ranges from [`Documentation`] back to TextRanges in the syntax tree.
 #[derive(Debug)]
 pub struct DocsRangeMap {
@@ -150,22 +86,6 @@ impl DocsRangeMap {
     }
 }
 
-fn get_doc_string_in_attr(it: &ast::Attr) -> Option<ast::String> {
-    match it.expr() {
-        // #[doc = lit]
-        Some(ast::Expr::Literal(lit)) => match lit.kind() {
-            ast::LiteralKind::String(it) => Some(it),
-            _ => None,
-        },
-        // #[cfg_attr(..., doc = "", ...)]
-        None => {
-            // FIXME: See highlight injection for what to do here
-            None
-        }
-        _ => None,
-    }
-}
-
 pub fn docs_with_rangemap(
     db: &dyn DefDatabase,
     attrs: &AttrsWithOwner,
@@ -237,6 +157,116 @@ pub fn docs_from_attrs(attrs: &hir::Attrs) -> Option<String> {
     }
 }
 
+macro_rules! impl_has_docs {
+    ($($def:ident,)*) => {$(
+        impl HasDocs for hir::$def {
+            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+                docs_from_attrs(&self.attrs(db)).map(Documentation)
+            }
+            fn resolve_doc_path(
+                self,
+                db: &dyn HirDatabase,
+                link: &str,
+                ns: Option<hir::Namespace>
+            ) -> Option<hir::DocLinkDef> {
+                resolve_doc_path_on(db, self, link, ns)
+            }
+        }
+    )*};
+}
+
+impl_has_docs![
+    Variant, Field, Static, Const, Trait, TraitAlias, TypeAlias, Macro, Function, Adt, Module,
+    Impl,
+];
+
+macro_rules! impl_has_docs_enum {
+    ($($variant:ident),* for $enum:ident) => {$(
+        impl HasDocs for hir::$variant {
+            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+                hir::$enum::$variant(self).docs(db)
+            }
+            fn resolve_doc_path(
+                self,
+                db: &dyn HirDatabase,
+                link: &str,
+                ns: Option<hir::Namespace>
+            ) -> Option<hir::DocLinkDef> {
+                hir::$enum::$variant(self).resolve_doc_path(db, link, ns)
+            }
+        }
+    )*};
+}
+
+impl_has_docs_enum![Struct, Union, Enum for Adt];
+
+impl HasDocs for hir::AssocItem {
+    fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+        match self {
+            hir::AssocItem::Function(it) => it.docs(db),
+            hir::AssocItem::Const(it) => it.docs(db),
+            hir::AssocItem::TypeAlias(it) => it.docs(db),
+        }
+    }
+
+    fn resolve_doc_path(
+        self,
+        db: &dyn HirDatabase,
+        link: &str,
+        ns: Option<hir::Namespace>,
+    ) -> Option<hir::DocLinkDef> {
+        match self {
+            hir::AssocItem::Function(it) => it.resolve_doc_path(db, link, ns),
+            hir::AssocItem::Const(it) => it.resolve_doc_path(db, link, ns),
+            hir::AssocItem::TypeAlias(it) => it.resolve_doc_path(db, link, ns),
+        }
+    }
+}
+
+impl HasDocs for hir::ExternCrateDecl {
+    fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+        let crate_docs =
+            docs_from_attrs(&self.resolved_crate(db)?.root_module().attrs(db)).map(String::from);
+        let decl_docs = docs_from_attrs(&self.attrs(db)).map(String::from);
+        match (decl_docs, crate_docs) {
+            (None, None) => None,
+            (Some(decl_docs), None) => Some(decl_docs),
+            (None, Some(crate_docs)) => Some(crate_docs),
+            (Some(mut decl_docs), Some(crate_docs)) => {
+                decl_docs.push('\n');
+                decl_docs.push('\n');
+                decl_docs += &crate_docs;
+                Some(decl_docs)
+            }
+        }
+        .map(Documentation::new)
+    }
+    fn resolve_doc_path(
+        self,
+        db: &dyn HirDatabase,
+        link: &str,
+        ns: Option<hir::Namespace>,
+    ) -> Option<hir::DocLinkDef> {
+        resolve_doc_path_on(db, self, link, ns)
+    }
+}
+
+fn get_doc_string_in_attr(it: &ast::Attr) -> Option<ast::String> {
+    match it.expr() {
+        // #[doc = lit]
+        Some(ast::Expr::Literal(lit)) => match lit.kind() {
+            ast::LiteralKind::String(it) => Some(it),
+            _ => None,
+        },
+        // #[cfg_attr(..., doc = "", ...)]
+        None => {
+            // FIXME: See highlight injection for what to do here
+            None
+        }
+        _ => None,
+    }
+}
+
 fn doc_indent(attrs: &hir::Attrs) -> usize {
     attrs
         .by_key("doc")
diff --git a/crates/ide/src/doc_links.rs b/crates/ide/src/doc_links.rs
index f714bb7d1db..37a17762216 100644
--- a/crates/ide/src/doc_links.rs
+++ b/crates/ide/src/doc_links.rs
@@ -16,7 +16,7 @@ use hir::{db::HirDatabase, Adt, AsAssocItem, AssocItem, AssocItemContainer, HasA
 use ide_db::{
     base_db::{CrateOrigin, LangCrateOrigin, ReleaseChannel, SourceDatabase},
     defs::{Definition, NameClass, NameRefClass},
-    documentation::{docs_with_rangemap, Documentation},
+    documentation::{docs_with_rangemap, Documentation, HasDocs},
     helpers::pick_best_token,
     RootDatabase,
 };
diff --git a/crates/ide/src/hover/render.rs b/crates/ide/src/hover/render.rs
index 59423396cec..f72ce37d1d9 100644
--- a/crates/ide/src/hover/render.rs
+++ b/crates/ide/src/hover/render.rs
@@ -471,7 +471,7 @@ pub(super) fn definition(
         Definition::SelfType(impl_def) => {
             impl_def.self_ty(db).as_adt().map(|adt| label_and_docs(db, adt))?
         }
-        Definition::GenericParam(it) => label_and_docs(db, it),
+        Definition::GenericParam(it) => (it.display(db).to_string(), None),
         Definition::Label(it) => return Some(Markup::fenced_block(&it.name(db).display(db))),
         Definition::ExternCrateDecl(it) => label_and_docs(db, it),
         // FIXME: We should be able to show more info about these