// Copyright (c) 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SPIRV_TOOLS_MESSAGE_H_
#define SPIRV_TOOLS_MESSAGE_H_

#include <functional>
#include <string>

#include "spirv-tools/libspirv.h"

namespace spvtools {

// TODO(antiagainst): This eventually should be in the C++ interface.

// Severity levels of messages communicated to the consumer.
enum MessageLevel {
  kFatal,          // Unrecoverable error due to environment.
                   // Will exit the program immediately. E.g.,
                   // out of memory.
  kInternalError,  // Unrecoverable error due to SPIRV-Tools internals.
                   // Will exit the program immediately. E.g.,
                   // unimplemented feature.
  kError,          // Normal error due to user input.
  kWarning,        // Warning information.
  kInfo,           // General information.
  kDebug,          // Debug information.
};

// Message consumer. The C strings for source and message are only alive for the
// specific invocation.
using MessageConsumer = std::function<void(
    MessageLevel /* level */, const char* /* source */,
    const spv_position_t& /* position */, const char* /* message */
    )>;

// A message consumer that ignores all messages.
inline void IgnoreMessage(MessageLevel, const char*, const spv_position_t&,
                          const char*) {}

// A helper function to compose and return a string from the message in the
// following format:
//   "<level>: <source>:<line>:<column>:<index>: <message>"
std::string StringifyMessage(MessageLevel level, const char* source,
                             const spv_position_t& position,
                             const char* message);

}  // namespace spvtools

#endif  // SPIRV_TOOLS_MESSAGE_H_