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//
// Created by luqiu on 2018-4-26.
//
#ifndef TFE_CFGPARSER_H
#define TFE_CFGPARSER_H
#ifndef TFE_STRING_MAX
#define TFE_STRING_MAX 2048
#endif
#include <stdexcept>
#include <string>
#include <cstring>
extern "C"
{
#include <MESA_prof_load.h>
}
class TfeConfigParser
{
public:
TfeConfigParser(std::string cfgfile) : str_cfgfile_(std::move(cfgfile))
{}
~TfeConfigParser() = default;
/* 读入函数 */
template<typename T>
T GetValue(const std::string &str_section, const std::string &str_entry);
template<typename T>
T GetValueWithDefault(const std::string &str_section, const std::string &str_entry, const T &default_value);
private:
std::string str_cfgfile_;
};
struct tfe_expection_cfg_invalid_format : std::runtime_error
{
explicit tfe_expection_cfg_invalid_format(
const std::string &file,
const std::string §ion,
const std::string &item,
const std::string &what) : file(file), section(section), item(item), runtime_error(what)
{}
std::string file;
std::string section;
std::string item;
};
struct tfe_expection_cfg_lost_entry : std::runtime_error
{
explicit tfe_expection_cfg_lost_entry(
const std::string &file,
const std::string §ion,
const std::string &item,
const std::string &what) : file(file), section(section), item(item), runtime_error(what)
{}
std::string file;
std::string section;
std::string item;
};
template<>
std::string TfeConfigParser::GetValue(const std::string &str_section, const std::string &str_entry)
{
char __str_buffer[TFE_STRING_MAX];
memset(__str_buffer, 0, sizeof(__str_buffer));
int ret = MESA_load_profile_string_nodef(str_cfgfile_.c_str(), str_section.c_str(), str_entry.c_str(),
__str_buffer, sizeof(__str_buffer));
if (ret < 0)
throw tfe_expection_cfg_lost_entry(str_cfgfile_, str_section, str_entry, "");
return std::string(__str_buffer);
}
template<>
unsigned long TfeConfigParser::GetValue(const std::string &str_section, const std::string &str_entry)
{
char *__ptr = nullptr;
std::string __str_value = GetValue<std::string>(str_section, str_entry);
unsigned long __value = strtoul(__str_value.c_str(), &__ptr, 0);
if (__ptr == __str_value.c_str())
{
throw tfe_expection_cfg_invalid_format(str_cfgfile_, str_section, str_entry,
__str_value + " is not valid unsigned number. ");
}
return __value;
}
template<>
bool TfeConfigParser::GetValue(const std::string &str_section, const std::string &str_entry)
{
return GetValue<unsigned long>(str_section, str_entry) != 0;
}
template<typename T>
T TfeConfigParser::GetValueWithDefault(
const std::string &str_section,
const std::string &str_entry,
const T &default_value)
{
T __value;
try
{
__value = GetValue<T>(str_section, str_entry);
}
catch (...)
{
return default_value;
}
return std::move(__value);
}
#endif //TFE_CFGPARSER_H
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