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cppargparse.hh
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/**
* @file cppargparse.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Thu Apr 03 2014
* @date last modification: Sun Dec 03 2017
*
* @brief Get the commandline options and store them as short, long and others
*
* @section LICENSE
*
* Copyright (©) 2014-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include <iostream>
#include <map>
#include <string>
#include <vector>
#ifndef __CPPARGPARSE_HH__
#define __CPPARGPARSE_HH__
/* -------------------------------------------------------------------------- */
namespace cppargparse {
/// define the types of the arguments
enum ArgumentType { _string, _integer, _float, _boolean };
/// Defines how many arguments to expect
enum ArgumentNargs { _one_if_possible = -1, _at_least_one = -2, _any = -3 };
/// Flags for the parse function of ArgumentParser
enum ParseFlags {
_no_flags = 0x0, ///< Default behavior
_stop_on_not_parsed = 0x1, ///< Stop on unknown arguments
_remove_parsed = 0x2 ///< Remove parsed arguments from argc argv
};
/// Helps to combine parse flags
inline ParseFlags operator|(const ParseFlags & a, const ParseFlags & b) {
auto tmp = ParseFlags(int(a) | int(b));
return tmp;
}
/* -------------------------------------------------------------------------- */
/**
* ArgumentParser is a class that mimics the Python argparse module
*/
class ArgumentParser {
public:
/// public definition of an argument
class Argument {
public:
Argument() : name(std::string()) {}
virtual ~Argument() = default;
virtual void printself(std::ostream & stream) const = 0;
template <class T> operator T() const;
std::string name;
};
/// constructor
ArgumentParser();
/// destroy everything
~ArgumentParser();
/// add an argument with a description
void addArgument(const std::string & name_or_flag, const std::string & help,
int nargs = 1, ArgumentType type = _string);
/// add an argument with an help and a default value
template <class T>
void addArgument(const std::string & name_or_flag, const std::string & help,
int nargs, ArgumentType type, T def);
/// add an argument with an help and a default + const value
template <class T>
void addArgument(const std::string & name_or_flag, const std::string & help,
int nargs, ArgumentType type, T def, T cons);
/// parse argc, argv
void parse(int & argc, char **& argv, int flags = _stop_on_not_parsed,
bool parse_help = true);
/// get the last argc parsed
int & getArgC() { return *(this->argc); }
/// get the last argv parsed
char **& getArgV() { return *(this->argv); }
/// print the content in the stream
void printself(std::ostream & stream) const;
/// print the help text
void print_help(std::ostream & stream = std::cout) const;
/// print the usage text
void print_usage(std::ostream & stream = std::cout) const;
/// set an external function to replace the exit function from the stdlib
void setExternalExitFunction(void (*external_exit)(int)) {
this->external_exit = external_exit;
}
/// accessor for a registered argument that was parsed, throw an exception if
/// the argument does not exist or was not set (parsed or default value)
const Argument & operator[](const std::string & name) const;
/// is the argument present
bool has(const std::string &) const;
/// set the parallel context to avoid multiple help messages in
/// multiproc/thread cases
void setParallelContext(int prank, int psize);
public:
/// Internal class describing the arguments
struct _Argument;
/// Stores that value of an argument
template <class T> class ArgumentStorage;
private:
/// Internal function to be used by the public addArgument
_Argument & _addArgument(const std::string & name_or_flag,
const std::string & description, int nargs,
ArgumentType type);
void _exit(const std::string & msg = "", int status = 0);
bool checkType(ArgumentType type, const std::string & value) const;
/// function to help to print help
void print_usage_nargs(std::ostream & stream,
const _Argument & argument) const;
/// function to help to print help
void print_help_argument(std::ostream & stream,
const _Argument & argument) const;
private:
/// public arguments storage
using Arguments = std::map<std::string, Argument *>;
/// internal arguments storage
using _Arguments = std::map<std::string, _Argument *>;
/// association key argument
using ArgumentKeyMap = std::map<std::string, _Argument *>;
/// position arguments
using PositionalArgument = std::vector<_Argument *>;
/// internal storage of arguments declared by the user
_Arguments arguments;
/// list of arguments successfully parsed
Arguments success_parsed;
/// keys associated to arguments
ArgumentKeyMap key_args;
/// positional arguments
PositionalArgument pos_args;
/// program name
std::string program_name;
/// exit function to use
void (*external_exit)(int){nullptr};
/// Parallel context, rank and size of communicator
int prank{0}, psize{1};
/// The last argc parsed (those are the modified version after parse)
int * argc;
/// The last argv parsed (those are the modified version after parse)
char *** argv;
};
}
inline std::ostream & operator<<(std::ostream & stream,
const cppargparse::ArgumentParser & argparse) {
argparse.printself(stream);
return stream;
}
#endif /* __CPPARGPARSE_HH__ */
#include "cppargparse_tmpl.hh"

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