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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
#define GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__

#include <string>

#include "absl/container/flat_hash_map.h"
#include "absl/strings/string_view.h"
#include "google/protobuf/compiler/cpp/helpers.h"
#include "google/protobuf/compiler/cpp/options.h"
#include "google/protobuf/port.h"

// Must be included last.
#include "google/protobuf/port_def.inc"

namespace google {
namespace protobuf {
class FieldDescriptor;  // descriptor.h
namespace io {
class Printer;  // printer.h
}
}  // namespace protobuf
}  // namespace google

namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {

class MessageSCCAnalyzer;

// Generates code for an extension, which may be within the scope of some
// message or may be at file scope.  This is much simpler than FieldGenerator
// since extensions are just simple identifiers with interesting types.
class PROTOC_EXPORT ExtensionGenerator {
 public:
  // See generator.cc for the meaning of dllexport_decl.
  explicit ExtensionGenerator(const FieldDescriptor* descriptor,
                              const Options& options,
                              MessageSCCAnalyzer* scc_analyzer);
  ExtensionGenerator(const ExtensionGenerator&) = delete;
  ExtensionGenerator& operator=(const ExtensionGenerator&) = delete;
  ~ExtensionGenerator();

  // Header stuff.
  void GenerateDeclaration(io::Printer* p) const;

  // Source file stuff.
  void GenerateDefinition(io::Printer* p);

  // Extension registration can happen at different priority levels depending on
  // the features used.
  //
  // For Weak Descriptor messages, we must use a two phase approach where we
  // first register all the extensions that are fully linked in, and then we
  // register the rest. To do that, we register the linked in extensions on
  // priority 101 and the rest as priority 102.
  // For extensions that are missing prototypes we need to create the prototypes
  // before we can register them, but for that we need to successfully parse
  // its descriptors, which might require other extensions to be registered
  // first. All extensions required for descriptor parsing will be fully linked
  // in and registered in the first phase.
  void GenerateRegistration(io::Printer* p, InitPriority priority);
  bool WillGenerateRegistration(InitPriority priority);

  bool IsScoped() const;

 private:
  const FieldDescriptor* descriptor_;
  std::string type_traits_;
  Options options_;
  MessageSCCAnalyzer* scc_analyzer_;

  absl::flat_hash_map<absl::string_view, std::string> variables_;
};

}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google

#include "google/protobuf/port_undef.inc"

#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_H__

	// Protocol Buffers - Google's data interchange format
	// Copyright 2008 Google Inc. All rights reserved.
	//
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file or at
	// https://developers.google.com/open-source/licenses/bsd

	// Author: kenton@google.com (Kenton Varda)
	// Based on original Protocol Buffers design by
	// Sanjay Ghemawat, Jeff Dean, and others.

	#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
	#define GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__

	#include <string>

	#include "absl/container/flat_hash_map.h"
	#include "absl/strings/string_view.h"
	#include "google/protobuf/compiler/cpp/helpers.h"
	#include "google/protobuf/compiler/cpp/options.h"
	#include "google/protobuf/port.h"

	// Must be included last.
	#include "google/protobuf/port_def.inc"

	namespace google {
	namespace protobuf {
	class FieldDescriptor; // descriptor.h
	namespace io {
	class Printer; // printer.h
	}
	} // namespace protobuf
	} // namespace google

	namespace google {
	namespace protobuf {
	namespace compiler {
	namespace cpp {

	class MessageSCCAnalyzer;

	// Generates code for an extension, which may be within the scope of some
	// message or may be at file scope. This is much simpler than FieldGenerator
	// since extensions are just simple identifiers with interesting types.
	class PROTOC_EXPORT ExtensionGenerator {
	public:
	// See generator.cc for the meaning of dllexport_decl.
	explicit ExtensionGenerator(const FieldDescriptor* descriptor,
	const Options& options,
	MessageSCCAnalyzer* scc_analyzer);
	ExtensionGenerator(const ExtensionGenerator&) = delete;
	ExtensionGenerator& operator=(const ExtensionGenerator&) = delete;
	~ExtensionGenerator();

	// Header stuff.
	void GenerateDeclaration(io::Printer* p) const;

	// Source file stuff.
	void GenerateDefinition(io::Printer* p);

	// Extension registration can happen at different priority levels depending on
	// the features used.
	//
	// For Weak Descriptor messages, we must use a two phase approach where we
	// first register all the extensions that are fully linked in, and then we
	// register the rest. To do that, we register the linked in extensions on
	// priority 101 and the rest as priority 102.
	// For extensions that are missing prototypes we need to create the prototypes
	// before we can register them, but for that we need to successfully parse
	// its descriptors, which might require other extensions to be registered
	// first. All extensions required for descriptor parsing will be fully linked
	// in and registered in the first phase.
	void GenerateRegistration(io::Printer* p, InitPriority priority);
	bool WillGenerateRegistration(InitPriority priority);

	bool IsScoped() const;

	private:
	const FieldDescriptor* descriptor_;
	std::string type_traits_;
	Options options_;
	MessageSCCAnalyzer* scc_analyzer_;

	absl::flat_hash_map<absl::string_view, std::string> variables_;
	};

	} // namespace cpp
	} // namespace compiler
	} // namespace protobuf
	} // namespace google

	#include "google/protobuf/port_undef.inc"

	#endif // GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_H__