commit bfda014ecddeb7491433e7ef78ee74203f01e9a0
author Joe Tsai <joetsai@digital-static.net> Fri Aug 10 13:58:07 2018 -0700
committer Joe Tsai <thebrokentoaster@gmail.com> Wed Aug 15 18:44:04 2018 +0000
tree c960f65a009e8de277010ccbf1d5dfaa201bef05
parent dbc9a12dbdd230536931ac3028b20578546dac72

reflect/prototype: initial commit

The prototype package provides constructors to create protobuf types that
implement the interfaces defined in the protoreflect package.

High-level API:
	func NewFile(t *File) (protoreflect.FileDescriptor, error)
	type File struct{ ... }
	type Message struct{ ... }
	type Field struct{ ... }
	type Oneof struct{ ... }
	type Enum struct{ ... }
	type EnumValue struct{ ... }
	type Extension struct{ ... }
	type Service struct{ ... }
	type Method struct{ ... }

	func NewEnum(t *StandaloneEnum) (protoreflect.EnumDescriptor, error)
	func NewMessage(t *StandaloneMessage) (protoreflect.MessageDescriptor, error)
	func NewExtension(t *StandaloneExtension) (protoreflect.ExtensionDescriptor, error)
	type StandaloneEnum struct{ ... }
	type StandaloneMessage struct{ ... }
	type StandaloneExtension struct{ ... }

	func PlaceholderFile(path string, pkg protoreflect.FullName) protoreflect.FileDescriptor
	func PlaceholderEnum(name protoreflect.FullName) protoreflect.EnumDescriptor
	func PlaceholderMessage(name protoreflect.FullName) protoreflect.MessageDescriptor

This CL is missing some features that are to be added later:
* The stringer methods are not implemented, providing no way to print the
descriptors in a humanly readable manner.
* There is no support for proto options or retrieving the raw descriptor.
* There are constructors for Go specific types (e.g., protoreflect.MessageType).

We drop go1.9 support since we use strings.Builder.
We switch to go.11rc1 to obtain some bug fixes for modules.

Change-Id: Ieac9a2530afc81e5a5bb9ab5816804372f652b18
Reviewed-on: https://go-review.googlesource.com/129057
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Herbie Ong <herbie@google.com>