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Tue, Nov 5, 09:24

cppargparse_tmpl.hh
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/**
* @file cppargparse_tmpl.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Thu Apr 03 2014
* @date last modification: Wed Nov 08 2017
*
* @brief Implementation of the templated part of the commandline argument
* parser
*
*
* 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 <sstream>
#include <stdexcept>
#ifndef __CPPARGPARSE_TMPL_HH__
#define __CPPARGPARSE_TMPL_HH__
namespace cppargparse {
/* -------------------------------------------------------------------------- */
/* Argument */
/* -------------------------------------------------------------------------- */
/// internal description of arguments
struct ArgumentParser::_Argument : public Argument {
_Argument() : Argument(), help(std::string()) {}
~_Argument() override = default;
void setValues(std::vector<std::string> & values) {
for (auto it = values.begin(); it != values.end(); ++it) {
this->addValue(*it);
}
}
virtual void addValue(std::string & value) = 0;
virtual void setToDefault() = 0;
virtual void setToConst() = 0;
std::ostream & printDefault(std::ostream & stream) const {
stream << std::boolalpha;
if (has_default) {
stream << " (default: ";
this->_printDefault(stream);
stream << ")";
}
if (has_const) {
stream << " (const: ";
this->_printConst(stream);
stream << ")";
}
return stream;
}
virtual std::ostream & _printDefault(std::ostream & stream) const = 0;
virtual std::ostream & _printConst(std::ostream & stream) const = 0;
std::string help;
int nargs{1};
ArgumentType type{_string};
bool required{false};
bool parsed{false};
bool has_default{false};
bool has_const{false};
std::vector<std::string> keys;
bool is_positional{false};
};
/* -------------------------------------------------------------------------- */
/// typed storage of the arguments
template <class T>
class ArgumentParser::ArgumentStorage : public ArgumentParser::_Argument {
public:
ArgumentStorage() : _default(T()), _const(T()), values(std::vector<T>()) {}
void addValue(std::string & value) override {
std::stringstream sstr(value);
T t;
sstr >> t;
values.push_back(t);
}
void setToDefault() override {
values.clear();
values.push_back(_default);
}
void setToConst() override {
values.clear();
values.push_back(_const);
}
void printself(std::ostream & stream) const override {
stream << this->name << " =";
stream << std::boolalpha; // for boolean
for (auto vit = this->values.begin(); vit != this->values.end(); ++vit) {
stream << " " << *vit;
}
}
std::ostream & _printDefault(std::ostream & stream) const override {
stream << _default;
return stream;
}
std::ostream & _printConst(std::ostream & stream) const override {
stream << _const;
return stream;
}
T _default;
T _const;
std::vector<T> values;
};
/* -------------------------------------------------------------------------- */
template <>
inline void
ArgumentParser::ArgumentStorage<std::string>::addValue(std::string & value) {
values.push_back(value);
}
template <class T> struct is_vector {
enum { value = false };
};
template <class T> struct is_vector<std::vector<T>> {
enum { value = true };
};
/* -------------------------------------------------------------------------- */
template <class T, bool is_vector = cppargparse::is_vector<T>::value>
struct cast_helper {
static T cast(const ArgumentParser::Argument & arg) {
const auto & _arg =
dynamic_cast<const ArgumentParser::ArgumentStorage<T> &>(arg);
if (_arg.values.size() == 1) {
return _arg.values[0];
} else {
throw std::length_error("Not enougth or too many argument where passed "
"for the command line argument: " +
arg.name);
}
}
};
template <class T> struct cast_helper<T, true> {
static T cast(const ArgumentParser::Argument & arg) {
const auto & _arg =
dynamic_cast<const ArgumentParser::ArgumentStorage<T> &>(arg);
return _arg.values;
}
};
/* -------------------------------------------------------------------------- */
template <class T> ArgumentParser::Argument::operator T() const {
return cast_helper<T>::cast(*this);
}
#if !defined(DOXYGEN)
template <> inline ArgumentParser::Argument::operator const std::string() const {
return cast_helper<std::string>::cast(*this);
}
template <> inline ArgumentParser::Argument::operator unsigned int() const {
return cast_helper<int>::cast(*this);
}
#endif
template <class T>
void ArgumentParser::addArgument(const std::string & name_or_flag,
const std::string & help, int nargs,
ArgumentType type, T def) {
_Argument & arg = _addArgument(name_or_flag, help, nargs, type);
dynamic_cast<ArgumentStorage<T> &>(arg)._default = def;
arg.has_default = true;
}
template <class T>
void ArgumentParser::addArgument(const std::string & name_or_flag,
const std::string & help, int nargs,
ArgumentType type, T def, T cons) {
_Argument & arg = _addArgument(name_or_flag, help, nargs, type);
dynamic_cast<ArgumentStorage<T> &>(arg)._default = def;
arg.has_default = true;
dynamic_cast<ArgumentStorage<T> &>(arg)._const = cons;
arg.has_const = true;
}
/* -------------------------------------------------------------------------- */
template <>
inline void
ArgumentParser::addArgument<const char *>(const std::string & name_or_flag,
const std::string & help, int nargs,
ArgumentType type, const char * def) {
this->addArgument<std::string>(name_or_flag, help, nargs, type, def);
}
template <>
inline void
ArgumentParser::addArgument<unsigned int>(const std::string & name_or_flag,
const std::string & help, int nargs,
ArgumentType type, unsigned int def) {
this->addArgument<int>(name_or_flag, help, nargs, type, def);
}
/* -------------------------------------------------------------------------- */
template <>
inline void ArgumentParser::addArgument<const char *>(
const std::string & name_or_flag, const std::string & help, int nargs,
ArgumentType type, const char * def, const char * cons) {
this->addArgument<std::string>(name_or_flag, help, nargs, type, def, cons);
}
template <>
inline void ArgumentParser::addArgument<unsigned int>(
const std::string & name_or_flag, const std::string & help, int nargs,
ArgumentType type, unsigned int def, unsigned int cons) {
this->addArgument<int>(name_or_flag, help, nargs, type, def, cons);
}
} // namespace cppargparse
#endif /* __AKANTU_CPPARGPARSE_TMPL_HH__ */

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