From 93aeb16eb21709de38ba8484fa82ed4e05ae5665 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Fri, 19 Mar 2021 19:56:13 +0100
Subject: Return `Either` from `MacroDefId::ast_id`

---
 crates/hir/src/has_source.rs     | 15 +++++----------
 crates/hir_def/src/attr.rs       |  7 ++++---
 crates/hir_expand/src/hygiene.rs |  2 +-
 crates/hir_expand/src/lib.rs     |  9 +++++----
 4 files changed, 15 insertions(+), 18 deletions(-)

(limited to 'crates')

diff --git a/crates/hir/src/has_source.rs b/crates/hir/src/has_source.rs
index d57fad9ed..dc10a4d0f 100644
--- a/crates/hir/src/has_source.rs
+++ b/crates/hir/src/has_source.rs
@@ -6,7 +6,7 @@ use hir_def::{
     src::{HasChildSource, HasSource as _},
     Lookup, VariantId,
 };
-use hir_expand::{InFile, MacroDefKind};
+use hir_expand::InFile;
 use syntax::ast;
 
 use crate::{
@@ -113,15 +113,10 @@ impl HasSource for TypeAlias {
 impl HasSource for MacroDef {
     type Ast = Either<ast::Macro, ast::Fn>;
     fn source(self, db: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
-        Some(match &self.id.kind {
-            MacroDefKind::Declarative(id)
-            | MacroDefKind::BuiltIn(_, id)
-            | MacroDefKind::BuiltInDerive(_, id)
-            | MacroDefKind::BuiltInEager(_, id) => {
-                id.with_value(Either::Left(id.to_node(db.upcast())))
-            }
-            MacroDefKind::ProcMacro(_, id) => id.map(|_| Either::Right(id.to_node(db.upcast()))),
-        })
+        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 {
diff --git a/crates/hir_def/src/attr.rs b/crates/hir_def/src/attr.rs
index 0360fb627..beeaaf117 100644
--- a/crates/hir_def/src/attr.rs
+++ b/crates/hir_def/src/attr.rs
@@ -208,9 +208,10 @@ impl Attrs {
                 AdtId::UnionId(it) => attrs_from_item_tree(it.lookup(db).id, db),
             },
             AttrDefId::TraitId(it) => attrs_from_item_tree(it.lookup(db).id, db),
-            AttrDefId::MacroDefId(it) => {
-                it.ast_id().map_or_else(Default::default, |ast_id| attrs_from_ast(ast_id, db))
-            }
+            AttrDefId::MacroDefId(it) => it
+                .ast_id()
+                .left()
+                .map_or_else(Default::default, |ast_id| attrs_from_ast(ast_id, db)),
             AttrDefId::ImplId(it) => attrs_from_item_tree(it.lookup(db).id, db),
             AttrDefId::ConstId(it) => attrs_from_item_tree(it.lookup(db).id, db),
             AttrDefId::StaticId(it) => attrs_from_item_tree(it.lookup(db).id, db),
diff --git a/crates/hir_expand/src/hygiene.rs b/crates/hir_expand/src/hygiene.rs
index 20cda1683..0e0f7214a 100644
--- a/crates/hir_expand/src/hygiene.rs
+++ b/crates/hir_expand/src/hygiene.rs
@@ -145,7 +145,7 @@ fn make_hygiene_info(
 ) -> Option<HygieneInfo> {
     let arg_tt = loc.kind.arg(db)?;
 
-    let def_offset = loc.def.ast_id().and_then(|id| {
+    let def_offset = loc.def.ast_id().left().and_then(|id| {
         let def_tt = match id.to_node(db) {
             ast::Macro::MacroRules(mac) => mac.token_tree()?.syntax().text_range().start(),
             ast::Macro::MacroDef(_) => return None,
diff --git a/crates/hir_expand/src/lib.rs b/crates/hir_expand/src/lib.rs
index c958b0865..f49fd4fda 100644
--- a/crates/hir_expand/src/lib.rs
+++ b/crates/hir_expand/src/lib.rs
@@ -15,6 +15,7 @@ pub mod proc_macro;
 pub mod quote;
 pub mod eager;
 
+use either::Either;
 pub use mbe::{ExpandError, ExpandResult};
 
 use std::hash::Hash;
@@ -143,7 +144,7 @@ impl HirFileId {
 
                 let arg_tt = loc.kind.arg(db)?;
 
-                let def = loc.def.ast_id().and_then(|id| {
+                let def = loc.def.ast_id().left().and_then(|id| {
                     let def_tt = match id.to_node(db) {
                         ast::Macro::MacroRules(mac) => mac.token_tree()?,
                         ast::Macro::MacroDef(_) => return None,
@@ -239,15 +240,15 @@ impl MacroDefId {
         db.intern_macro(MacroCallLoc { def: self, krate, kind })
     }
 
-    pub fn ast_id(&self) -> Option<AstId<ast::Macro>> {
+    pub fn ast_id(&self) -> Either<AstId<ast::Macro>, AstId<ast::Fn>> {
         let id = match &self.kind {
             MacroDefKind::Declarative(id) => id,
             MacroDefKind::BuiltIn(_, id) => id,
             MacroDefKind::BuiltInDerive(_, id) => id,
             MacroDefKind::BuiltInEager(_, id) => id,
-            MacroDefKind::ProcMacro(..) => return None,
+            MacroDefKind::ProcMacro(_, id) => return Either::Right(*id),
         };
-        Some(*id)
+        Either::Left(*id)
     }
 }
 
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