log.h

/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.

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. */

#pragma once

#include <vector>
#ifdef PADDLE_MOBILE_DEBUG
#include <iostream>
#include <sstream>
#include <string>
#endif

namespace paddle_mobile {

#ifdef PADDLE_MOBILE_DEBUG

enum LogLevel {
  kNO_LOG,
  kLOG_ERROR,
  kLOG_WARNING,
  kLOG_INFO,
  kLOG_DEBUG,
  kLOG_DEBUG1,
  kLOG_DEBUG2,
  kLOG_DEBUG3,
  kLOG_DEBUG4
};

// log level
static LogLevel log_level = kLOG_DEBUG4;

static std::vector<std::string> logs{"NO",      "ERROR ",  "WARNING",
                                     "INFO   ", "DEBUG  ", "DEBUG1 ",
                                     "DEBUG2 ", "DEBUG3 ", "DEBUG4 "};
struct ToLog;
struct Print;

struct Print {
  friend struct ToLog;

  template <typename T>
  Print &operator<<(T const &value) {
    buffer_ << value;
    return *this;
  }

 private:
  void print(LogLevel level) {
    buffer_ << std::endl;
    if (level == kLOG_ERROR) {
      std::cerr << buffer_.str();
    } else {
      std::cout << buffer_.str();
    }
  }
  std::ostringstream buffer_;
};

struct ToLog {
  ToLog(LogLevel level = kLOG_DEBUG, const std::string &info = "")
      : level_(level) {
    unsigned blanks =
        (unsigned)(level > kLOG_DEBUG ? (level - kLOG_DEBUG) * 4 : 1);
    printer_ << logs[level] << " " << info << ":" << std::string(blanks, ' ');
  }

  template <typename T>
  ToLog &operator<<(T const &value) {
    printer_ << value;
    return *this;
  }

  ~ToLog() { printer_.print(level_); }

 private:
  LogLevel level_;
  Print printer_;
};

#define LOG(level)                                                             \
  if (level > paddle_mobile::log_level) {                                      \
  } else                                                                       \
    paddle_mobile::ToLog(                                                      \
        level,                                                                 \
        (std::stringstream()                                                   \
         << "[file: "                                                          \
         << (strrchr(__FILE__, '/') ? (strrchr(__FILE__, '/') + 1) : __FILE__) \
         << "] [line: " << __LINE__ << "] ")                                   \
            .str())

#define DLOG                                                                   \
  if (paddle_mobile::kLOG_DEBUG > paddle_mobile::log_level) {                  \
  } else                                                                       \
    paddle_mobile::ToLog(                                                      \
        paddle_mobile::kLOG_DEBUG,                                             \
        (std::stringstream()                                                   \
         << "[file: "                                                          \
         << (strrchr(__FILE__, '/') ? (strrchr(__FILE__, '/') + 1) : __FILE__) \
         << "] [line: " << __LINE__ << "] ")                                   \
            .str())

#define LOGF(level, format, ...)          \
  if (level > paddle_mobile::log_level) { \
  } else                                  \
    printf(format, ##__VA_ARGS__)

#define DLOGF(format, ...)                                    \
  if (paddle_mobile::kLOG_DEBUG > paddle_mobile::log_level) { \
  } else                                                      \
    printf(format, ##__VA_ARGS__)

#else

enum LogLevel {
  kNO_LOG,
  kLOG_ERROR,
  kLOG_WARNING,
  kLOG_INFO,
  kLOG_DEBUG,
  kLOG_DEBUG1,
  kLOG_DEBUG2,
  kLOG_DEBUG3,
  kLOG_DEBUG4
};

struct ToLog;
struct Print {
  friend struct ToLog;
  template <typename T>
  Print &operator<<(T const &value) {}

 private:
};

struct ToLog {
  ToLog(LogLevel level) {}

  template <typename T>
  ToLog &operator<<(T const &value) {
    return *this;
  }
};

#define LOG(level) \
  if (true) {      \
  } else           \
    paddle_mobile::ToLog(level)

#define DLOG  \
  if (true) { \
  } else      \
    paddle_mobile::ToLog(paddle_mobile::kLOG_DEBUG)

#define LOGF(level, format, ...)

#define DLOGF(format, ...)

#endif

template <typename T>
Print &operator<<(Print &printer, const std::vector<T> &v) {
  printer << "[\n ";

  for (int i = 0; i < v.size(); ++i) {
    const auto &value = v[i];
    printer << value << " ";
    if (i % 10 == 9) {
      printer << "\n";
    }
  }
  printer << " \n]";
  return printer;
}

}  // namespace paddle_mobile