1 files changed, 276 insertions, 0 deletions
diff --git a/vendor/google.golang.org/protobuf/reflect/protodesc/desc.go b/vendor/google.golang.org/protobuf/reflect/protodesc/desc.go
new file mode 100644
index 00000000..e4dfb120
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protodesc/desc.go
@@ -0,0 +1,276 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protodesc provides functionality for converting
+// FileDescriptorProto messages to/from protoreflect.FileDescriptor values.
+//
+// The google.protobuf.FileDescriptorProto is a protobuf message that describes
+// the type information for a .proto file in a form that is easily serializable.
+// The protoreflect.FileDescriptor is a more structured representation of
+// the FileDescriptorProto message where references and remote dependencies
+// can be directly followed.
+package protodesc
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// Resolver is the resolver used by NewFile to resolve dependencies.
+// The enums and messages provided must belong to some parent file,
+// which is also registered.
+//
+// It is implemented by protoregistry.Files.
+type Resolver interface {
+	FindFileByPath(string) (protoreflect.FileDescriptor, error)
+	FindDescriptorByName(protoreflect.FullName) (protoreflect.Descriptor, error)
+}
+
+// FileOptions configures the construction of file descriptors.
+type FileOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// AllowUnresolvable configures New to permissively allow unresolvable
+	// file, enum, or message dependencies. Unresolved dependencies are replaced
+	// by placeholder equivalents.
+	//
+	// The following dependencies may be left unresolved:
+	//	• Resolving an imported file.
+	//	• Resolving the type for a message field or extension field.
+	//	If the kind of the field is unknown, then a placeholder is used for both
+	//	the Enum and Message accessors on the protoreflect.FieldDescriptor.
+	//	• Resolving an enum value set as the default for an optional enum field.
+	//	If unresolvable, the protoreflect.FieldDescriptor.Default is set to the
+	//	first value in the associated enum (or zero if the also enum dependency
+	//	is also unresolvable). The protoreflect.FieldDescriptor.DefaultEnumValue
+	//	is populated with a placeholder.
+	//	• Resolving the extended message type for an extension field.
+	//	• Resolving the input or output message type for a service method.
+	//
+	// If the unresolved dependency uses a relative name,
+	// then the placeholder will contain an invalid FullName with a "*." prefix,
+	// indicating that the starting prefix of the full name is unknown.
+	AllowUnresolvable bool
+}
+
+// NewFile creates a new protoreflect.FileDescriptor from the provided
+// file descriptor message. See FileOptions.New for more information.
+func NewFile(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
+	return FileOptions{}.New(fd, r)
+}
+
+// NewFiles creates a new protoregistry.Files from the provided
+// FileDescriptorSet message. See FileOptions.NewFiles for more information.
+func NewFiles(fd *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
+	return FileOptions{}.NewFiles(fd)
+}
+
+// New creates a new protoreflect.FileDescriptor from the provided
+// file descriptor message. The file must represent a valid proto file according
+// to protobuf semantics. The returned descriptor is a deep copy of the input.
+//
+// Any imported files, enum types, or message types referenced in the file are
+// resolved using the provided registry. When looking up an import file path,
+// the path must be unique. The newly created file descriptor is not registered
+// back into the provided file registry.
+func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
+	if r == nil {
+		r = (*protoregistry.Files)(nil) // empty resolver
+	}
+
+	// Handle the file descriptor content.
+	f := &filedesc.File{L2: &filedesc.FileL2{}}
+	switch fd.GetSyntax() {
+	case "proto2", "":
+		f.L1.Syntax = protoreflect.Proto2
+	case "proto3":
+		f.L1.Syntax = protoreflect.Proto3
+	default:
+		return nil, errors.New("invalid syntax: %q", fd.GetSyntax())
+	}
+	f.L1.Path = fd.GetName()
+	if f.L1.Path == "" {
+		return nil, errors.New("file path must be populated")
+	}
+	f.L1.Package = protoreflect.FullName(fd.GetPackage())
+	if !f.L1.Package.IsValid() && f.L1.Package != "" {
+		return nil, errors.New("invalid package: %q", f.L1.Package)
+	}
+	if opts := fd.GetOptions(); opts != nil {
+		opts = proto.Clone(opts).(*descriptorpb.FileOptions)
+		f.L2.Options = func() protoreflect.ProtoMessage { return opts }
+	}
+
+	f.L2.Imports = make(filedesc.FileImports, len(fd.GetDependency()))
+	for _, i := range fd.GetPublicDependency() {
+		if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsPublic {
+			return nil, errors.New("invalid or duplicate public import index: %d", i)
+		}
+		f.L2.Imports[i].IsPublic = true
+	}
+	for _, i := range fd.GetWeakDependency() {
+		if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsWeak {
+			return nil, errors.New("invalid or duplicate weak import index: %d", i)
+		}
+		f.L2.Imports[i].IsWeak = true
+	}
+	imps := importSet{f.Path(): true}
+	for i, path := range fd.GetDependency() {
+		imp := &f.L2.Imports[i]
+		f, err := r.FindFileByPath(path)
+		if err == protoregistry.NotFound && (o.AllowUnresolvable || imp.IsWeak) {
+			f = filedesc.PlaceholderFile(path)
+		} else if err != nil {
+			return nil, errors.New("could not resolve import %q: %v", path, err)
+		}
+		imp.FileDescriptor = f
+
+		if imps[imp.Path()] {
+			return nil, errors.New("already imported %q", path)
+		}
+		imps[imp.Path()] = true
+	}
+	for i := range fd.GetDependency() {
+		imp := &f.L2.Imports[i]
+		imps.importPublic(imp.Imports())
+	}
+
+	// Handle source locations.
+	f.L2.Locations.File = f
+	for _, loc := range fd.GetSourceCodeInfo().GetLocation() {
+		var l protoreflect.SourceLocation
+		// TODO: Validate that the path points to an actual declaration?
+		l.Path = protoreflect.SourcePath(loc.GetPath())
+		s := loc.GetSpan()
+		switch len(s) {
+		case 3:
+			l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[0]), int(s[2])
+		case 4:
+			l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[2]), int(s[3])
+		default:
+			return nil, errors.New("invalid span: %v", s)
+		}
+		// TODO: Validate that the span information is sensible?
+		// See https://github.com/protocolbuffers/protobuf/issues/6378.
+		if false && (l.EndLine < l.StartLine || l.StartLine < 0 || l.StartColumn < 0 || l.EndColumn < 0 ||
+			(l.StartLine == l.EndLine && l.EndColumn <= l.StartColumn)) {
+			return nil, errors.New("invalid span: %v", s)
+		}
+		l.LeadingDetachedComments = loc.GetLeadingDetachedComments()
+		l.LeadingComments = loc.GetLeadingComments()
+		l.TrailingComments = loc.GetTrailingComments()
+		f.L2.Locations.List = append(f.L2.Locations.List, l)
+	}
+
+	// Step 1: Allocate and derive the names for all declarations.
+	// This copies all fields from the descriptor proto except:
+	//	google.protobuf.FieldDescriptorProto.type_name
+	//	google.protobuf.FieldDescriptorProto.default_value
+	//	google.protobuf.FieldDescriptorProto.oneof_index
+	//	google.protobuf.FieldDescriptorProto.extendee
+	//	google.protobuf.MethodDescriptorProto.input
+	//	google.protobuf.MethodDescriptorProto.output
+	var err error
+	sb := new(strs.Builder)
+	r1 := make(descsByName)
+	if f.L1.Enums.List, err = r1.initEnumDeclarations(fd.GetEnumType(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Messages.List, err = r1.initMessagesDeclarations(fd.GetMessageType(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Extensions.List, err = r1.initExtensionDeclarations(fd.GetExtension(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Services.List, err = r1.initServiceDeclarations(fd.GetService(), f, sb); err != nil {
+		return nil, err
+	}
+
+	// Step 2: Resolve every dependency reference not handled by step 1.
+	r2 := &resolver{local: r1, remote: r, imports: imps, allowUnresolvable: o.AllowUnresolvable}
+	if err := r2.resolveMessageDependencies(f.L1.Messages.List, fd.GetMessageType()); err != nil {
+		return nil, err
+	}
+	if err := r2.resolveExtensionDependencies(f.L1.Extensions.List, fd.GetExtension()); err != nil {
+		return nil, err
+	}
+	if err := r2.resolveServiceDependencies(f.L1.Services.List, fd.GetService()); err != nil {
+		return nil, err
+	}
+
+	// Step 3: Validate every enum, message, and extension declaration.
+	if err := validateEnumDeclarations(f.L1.Enums.List, fd.GetEnumType()); err != nil {
+		return nil, err
+	}
+	if err := validateMessageDeclarations(f.L1.Messages.List, fd.GetMessageType()); err != nil {
+		return nil, err
+	}
+	if err := validateExtensionDeclarations(f.L1.Extensions.List, fd.GetExtension()); err != nil {
+		return nil, err
+	}
+
+	return f, nil
+}
+
+type importSet map[string]bool
+
+func (is importSet) importPublic(imps protoreflect.FileImports) {
+	for i := 0; i < imps.Len(); i++ {
+		if imp := imps.Get(i); imp.IsPublic {
+			is[imp.Path()] = true
+			is.importPublic(imp.Imports())
+		}
+	}
+}
+
+// NewFiles creates a new protoregistry.Files from the provided
+// FileDescriptorSet message. The descriptor set must include only
+// valid files according to protobuf semantics. The returned descriptors
+// are a deep copy of the input.
+func (o FileOptions) NewFiles(fds *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
+	files := make(map[string]*descriptorpb.FileDescriptorProto)
+	for _, fd := range fds.File {
+		if _, ok := files[fd.GetName()]; ok {
+			return nil, errors.New("file appears multiple times: %q", fd.GetName())
+		}
+		files[fd.GetName()] = fd
+	}
+	r := &protoregistry.Files{}
+	for _, fd := range files {
+		if err := o.addFileDeps(r, fd, files); err != nil {
+			return nil, err
+		}
+	}
+	return r, nil
+}
+func (o FileOptions) addFileDeps(r *protoregistry.Files, fd *descriptorpb.FileDescriptorProto, files map[string]*descriptorpb.FileDescriptorProto) error {
+	// Set the entry to nil while descending into a file's dependencies to detect cycles.
+	files[fd.GetName()] = nil
+	for _, dep := range fd.Dependency {
+		depfd, ok := files[dep]
+		if depfd == nil {
+			if ok {
+				return errors.New("import cycle in file: %q", dep)
+			}
+			continue
+		}
+		if err := o.addFileDeps(r, depfd, files); err != nil {
+			return err
+		}
+	}
+	// Delete the entry once dependencies are processed.
+	delete(files, fd.GetName())
+	f, err := o.New(fd, r)
+	if err != nil {
+		return err
+	}
+	return r.RegisterFile(f)
+}