clang-format: fix spacing in `operator const char*()`

Summary:
Revision a75f8d98d7ac9e557b238a229a9a2647c71feed1 fixed spacing for operators,
but caused the const and non-const versions to diverge:
```
// With Style.PointerAlignment = FormatStyle::PAS_Left:

struct A {
  operator char*() { return ""; }
  operator const char *() const { return ""; }
};

```
The code was checking if the type specifier was directly preceded by `operator`.
However there could be comments and `const/volatile` in between.

Reviewers: mprobst

Reviewed By: mprobst

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D72911

(cherry picked from commit 33463cfba2be7c8d6c08e666123cc34f114a1f3e)

2 files changed, 20 insertions, 4 deletions

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 88564e02f23..70bcd7048c5 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2707,10 +2707,17 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
     return false;
   if (Right.isOneOf(tok::star, tok::amp, tok::ampamp) &&
       (Left.is(tok::identifier) || Left.isSimpleTypeSpecifier()) &&
-      Left.Previous && Left.Previous->is(tok::kw_operator))
-    // Space between the type and the *
-    // operator void*(), operator char*(), operator Foo*() dependant
-    // on PointerAlignment style.
+      // Space between the type and the * in:
+      //   operator void*()
+      //   operator char*()
+      //   operator /*comment*/ const char*()
+      //   operator volatile /*comment*/ char*()
+      //   operator Foo*()
+      // dependent on PointerAlignment style.
+      Left.Previous &&
+      (Left.Previous->endsSequence(tok::kw_operator) ||
+       Left.Previous->endsSequence(tok::kw_const, tok::kw_operator) ||
+       Left.Previous->endsSequence(tok::kw_volatile, tok::kw_operator)))
     return (Style.PointerAlignment != FormatStyle::PAS_Left);
   const auto SpaceRequiredForArrayInitializerLSquare =
       [](const FormatToken &LSquareTok, const FormatStyle &Style) {
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index c47e2e9a116..a5a26b5c1e8 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -15008,6 +15008,9 @@ TEST_F(FormatTest, OperatorSpacing) {
   Style.PointerAlignment = FormatStyle::PAS_Left;
   verifyFormat("Foo::operator*();", Style);
   verifyFormat("Foo::operator void*();", Style);
+  verifyFormat("Foo::operator/*comment*/ void*();", Style);
+  verifyFormat("Foo::operator/*a*/ const /*b*/ void*();", Style);
+  verifyFormat("Foo::operator/*a*/ volatile /*b*/ void*();", Style);
   verifyFormat("Foo::operator()(void*);", Style);
   verifyFormat("Foo::operator*(void*);", Style);
   verifyFormat("Foo::operator*();", Style);
@@ -15015,6 +15018,9 @@ TEST_F(FormatTest, OperatorSpacing) {
 
   verifyFormat("Foo::operator&();", Style);
   verifyFormat("Foo::operator void&();", Style);
+  verifyFormat("Foo::operator/*comment*/ void&();", Style);
+  verifyFormat("Foo::operator/*a*/ const /*b*/ void&();", Style);
+  verifyFormat("Foo::operator/*a*/ volatile /*b*/ void&();", Style);
   verifyFormat("Foo::operator()(void&);", Style);
   verifyFormat("Foo::operator&(void&);", Style);
   verifyFormat("Foo::operator&();", Style);
@@ -15022,6 +15028,9 @@ TEST_F(FormatTest, OperatorSpacing) {
 
   verifyFormat("Foo::operator&&();", Style);
   verifyFormat("Foo::operator void&&();", Style);
+  verifyFormat("Foo::operator/*comment*/ void&&();", Style);
+  verifyFormat("Foo::operator/*a*/ const /*b*/ void&&();", Style);
+  verifyFormat("Foo::operator/*a*/ volatile /*b*/ void&&();", Style);
   verifyFormat("Foo::operator()(void&&);", Style);
   verifyFormat("Foo::operator&&(void&&);", Style);
   verifyFormat("Foo::operator&&();", Style);