From 16156d766dd8a5624d9455ffded6358fe879c416 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Mon, 23 Dec 2019 13:18:28 +0800
Subject: Add macro call support for type_of

---
 crates/ra_hir/src/source_binder.rs | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

(limited to 'crates/ra_hir/src/source_binder.rs')

diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index 85b378483..3af477818 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -17,7 +17,7 @@ use hir_def::{
     nameres::ModuleSource,
     path::path,
     resolver::{self, resolver_for_scope, HasResolver, Resolver, TypeNs, ValueNs},
-    AssocItemId, DefWithBodyId,
+    AssocItemId, DefWithBodyId, Expander,
 };
 use hir_expand::{
     hygiene::Hygiene, name::AsName, AstId, HirFileId, InFile, MacroCallId, MacroCallKind,
@@ -216,7 +216,14 @@ impl SourceAnalyzer {
     }
 
     pub fn type_of(&self, db: &impl HirDatabase, expr: &ast::Expr) -> Option<Type> {
-        let expr_id = self.expr_id(expr)?;
+        let expr_id = if let Some(macro_call) = ast::MacroCall::cast(expr.syntax().clone()) {
+            let mut expander = Expander::new(db, self.file_id, self.body_owner?.module(db).id);
+            let expr = expand_macro_call_to_expr(db, &mut expander, macro_call)?;
+            self.body_source_map.as_ref()?.node_expr(expr.as_ref())?
+        } else {
+            self.expr_id(expr)?
+        };
+
         let ty = self.infer.as_ref()?[expr_id].clone();
         let environment = TraitEnvironment::lower(db, &self.resolver);
         Some(Type { krate: self.resolver.krate()?, ty: InEnvironment { value: ty, environment } })
@@ -501,6 +508,21 @@ fn scope_for_offset(
         })
 }
 
+fn expand_macro_call_to_expr(
+    db: &impl HirDatabase,
+    expander: &mut Expander,
+    macro_call: ast::MacroCall,
+) -> Option<InFile<ast::Expr>> {
+    let (mark, expr): (_, ast::Expr) = expander.enter_expand(db, macro_call)?;
+    let expr = if let Some(child) = ast::MacroCall::cast(expr.syntax().clone()) {
+        expand_macro_call_to_expr(db, expander, child)
+    } else {
+        Some(expander.to_source(expr))
+    };
+    expander.exit(db, mark);
+    expr
+}
+
 // XXX: during completion, cursor might be outside of any particular
 // expression. Try to figure out the correct scope...
 fn adjust(
-- 
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