grpc/src/compiler/cpp_generator.h

/*
 *
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H
#define GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H

// cpp_generator.h/.cc do not directly depend on GRPC/ProtoBuf, such that they
// can be used to generate code for other serialization systems, such as
// FlatBuffers.

#include <memory>
#include <vector>

#ifndef GRPC_CUSTOM_STRING
#include <string>
#define GRPC_CUSTOM_STRING std::string
#endif

namespace grpc {

typedef GRPC_CUSTOM_STRING string;

}  // namespace grpc

namespace grpc_cpp_generator {

// Contains all the parameters that are parsed from the command line.
struct Parameters {
  // Puts the service into a namespace
  grpc::string services_namespace;
  // Use system includes (<>) or local includes ("")
  bool use_system_headers;
  // Prefix to any grpc include
  grpc::string grpc_search_path;
};

// A common interface for objects having comments in the source.
// Return formatted comments to be inserted in generated code.
struct CommentHolder {
  virtual ~CommentHolder() {}
  virtual grpc::string GetLeadingComments() const = 0;
  virtual grpc::string GetTrailingComments() const = 0;
};

// An abstract interface representing a method.
struct Method : public CommentHolder {
  virtual ~Method() {}

  virtual grpc::string name() const = 0;

  virtual grpc::string input_type_name() const = 0;
  virtual grpc::string output_type_name() const = 0;

  virtual bool NoStreaming() const = 0;
  virtual bool ClientOnlyStreaming() const = 0;
  virtual bool ServerOnlyStreaming() const = 0;
  virtual bool BidiStreaming() const = 0;
};

// An abstract interface representing a service.
struct Service : public CommentHolder {
  virtual ~Service() {}

  virtual grpc::string name() const = 0;

  virtual int method_count() const = 0;
  virtual std::unique_ptr<const Method> method(int i) const = 0;
};

struct Printer {
  virtual ~Printer() {}

  virtual void Print(const std::map<grpc::string, grpc::string> &vars,
                     const char *template_string) = 0;
  virtual void Print(const char *string) = 0;
  virtual void Indent() = 0;
  virtual void Outdent() = 0;
};

// An interface that allows the source generated to be output using various
// libraries/idls/serializers.
struct File : public CommentHolder {
  virtual ~File() {}

  virtual grpc::string filename() const = 0;
  virtual grpc::string filename_without_ext() const = 0;
  virtual grpc::string message_header_ext() const = 0;
  virtual grpc::string service_header_ext() const = 0;
  virtual grpc::string package() const = 0;
  virtual std::vector<grpc::string> package_parts() const = 0;
  virtual grpc::string additional_headers() const = 0;

  virtual int service_count() const = 0;
  virtual std::unique_ptr<const Service> service(int i) const = 0;

  virtual std::unique_ptr<Printer> CreatePrinter(grpc::string *str) const = 0;
};

// Return the prologue of the generated header file.
grpc::string GetHeaderPrologue(File *file, const Parameters &params);

// Return the includes needed for generated header file.
grpc::string GetHeaderIncludes(File *file, const Parameters &params);

// Return the includes needed for generated source file.
grpc::string GetSourceIncludes(File *file, const Parameters &params);

// Return the epilogue of the generated header file.
grpc::string GetHeaderEpilogue(File *file, const Parameters &params);

// Return the prologue of the generated source file.
grpc::string GetSourcePrologue(File *file, const Parameters &params);

// Return the services for generated header file.
grpc::string GetHeaderServices(File *file, const Parameters &params);

// Return the services for generated source file.
grpc::string GetSourceServices(File *file, const Parameters &params);

// Return the epilogue of the generated source file.
grpc::string GetSourceEpilogue(File *file, const Parameters &params);

}  // namespace grpc_cpp_generator

#endif  // GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H