internal/typefmt: move descriptor formatting logic to typefmt
Custom descriptor types would want to benefit from descriptor formatting.
As such, move the logic out from prototype into an internal package for
the benefit of usages outside the prototype package.
Change-Id: I4bb2144221e656aa36909d33a77189fe084f700b
Reviewed-on: https://go-review.googlesource.com/c/152777
Reviewed-by: Herbie Ong <herbie@google.com>
diff --git a/internal/legacy/extension.go b/internal/legacy/extension.go
index 1c76674..4a074d2 100644
--- a/internal/legacy/extension.go
+++ b/internal/legacy/extension.go
@@ -12,6 +12,7 @@
papi "github.com/golang/protobuf/protoapi"
ptag "github.com/golang/protobuf/v2/internal/encoding/tag"
pimpl "github.com/golang/protobuf/v2/internal/impl"
+ pfmt "github.com/golang/protobuf/v2/internal/typefmt"
pvalue "github.com/golang/protobuf/v2/internal/value"
pref "github.com/golang/protobuf/v2/reflect/protoreflect"
ptype "github.com/golang/protobuf/v2/reflect/prototype"
@@ -248,5 +249,4 @@
func (x *extensionType) New() interface{} { return x.new() }
func (x *extensionType) ValueOf(v interface{}) pref.Value { return x.valueOf(v) }
func (x *extensionType) InterfaceOf(v pref.Value) interface{} { return x.interfaceOf(v) }
-
-// TODO: Provide custom stringer with the new GoType.
+func (x *extensionType) Format(s fmt.State, r rune) { pfmt.FormatDesc(s, r, x) }