cppargparse.cc
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Created: Fri, Nov 15, 07:58

cppargparse.cc
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	/**
	* @file cppargparse.cc
	*
	* @author Nicolas Richart <nicolas.richart@epfl.ch>
	*
	* @date creation: Thu Apr 03 2014
	* @date last modification: Wed Nov 08 2017
	*
	* @brief implementation of the ArgumentParser
	*
	*
	* 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 "cppargparse.hh"

	#include <cstdlib>
	#include <cstring>
	#include <libgen.h>

	#include <algorithm>
	#include <iomanip>
	#include <iostream>
	#include <queue>
	#include <sstream>
	#include <string>

	#include <exception>
	#include <stdexcept>
	#include <string.h>

	namespace cppargparse {

	/* -------------------------------------------------------------------------- */
	static inline std::string to_upper(const std::string & str) {
	std::string lstr = str;
	std::transform(lstr.begin(), lstr.end(), lstr.begin(),
	(int (*)(int))std::toupper);
	return lstr;
	}

	/* -------------------------------------------------------------------------- */
	/* ArgumentParser */
	/* -------------------------------------------------------------------------- */
	ArgumentParser::ArgumentParser() {
	this->addArgument("-h;--help", "show this help message and exit", 0, _boolean,
	false, true);
	}

	/* -------------------------------------------------------------------------- */
	ArgumentParser::~ArgumentParser() {
	for (auto it = arguments.begin(); it != arguments.end(); ++it) {
	delete it->second;
	}
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::setParallelContext(int prank, int psize) {
	this->prank = prank;
	this->psize = psize;
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::_exit(const std::string & msg, int status) {
	if (prank == 0) {
	if (msg != "") {
	std::cerr << msg << std::endl;
	std::cerr << std::endl;
	}

	this->print_help(std::cerr);
	}

	if (external_exit)
	(*external_exit)(status);
	else {
	exit(status);
	}
	}

	/* -------------------------------------------------------------------------- */
	const ArgumentParser::Argument & ArgumentParser::
	operator[](const std::string & name) const {
	auto it = success_parsed.find(name);

	if (it != success_parsed.end()) {
	return *(it->second);
	} else {
	throw std::range_error("No argument named \'" + name +
	"\' was found in the parsed argument," +
	" make sur to specify it \'required\'" +
	" or to give it a default value");
	}
	}

	/* -------------------------------------------------------------------------- */
	bool ArgumentParser::has(const std::string & name) const {
	return (success_parsed.find(name) != success_parsed.end());
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::addArgument(const std::string & name_or_flag,
	const std::string & help, int nargs,
	ArgumentType type) {
	_addArgument(name_or_flag, help, nargs, type);
	}

	/* -------------------------------------------------------------------------- */
	ArgumentParser::_Argument &
	ArgumentParser::_addArgument(const std::string & name, const std::string & help,
	int nargs, ArgumentType type) {
	_Argument * arg = nullptr;

	switch (type) {
	case _string: {
	arg = new ArgumentStorage<std::string>();
	break;
	}
	case _float: {
	arg = new ArgumentStorage<double>();
	break;
	}
	case _integer: {
	arg = new ArgumentStorage<long int>();
	break;
	}
	case _boolean: {
	arg = new ArgumentStorage<bool>();
	break;
	}
	}

	arg->help = help;
	arg->nargs = nargs;
	arg->type = type;

	std::stringstream sstr(name);
	std::string item;
	std::vector<std::string> tmp_keys;
	while (std::getline(sstr, item, ';')) {
	tmp_keys.push_back(item);
	}

	int long_key = -1;
	int short_key = -1;
	bool problem = (tmp_keys.size() > 2) \|\| (name == "");
	for (auto it = tmp_keys.begin(); it != tmp_keys.end(); ++it) {
	if (it->find("--") == 0) {
	problem \|= (long_key != -1);
	long_key = it - tmp_keys.begin();
	} else if (it->find("-") == 0) {
	problem \|= (long_key != -1);
	short_key = it - tmp_keys.begin();
	}
	}

	problem \|= ((tmp_keys.size() == 2) && (long_key == -1 \|\| short_key == -1));

	if (problem) {
	delete arg;
	throw std::invalid_argument("Synthax of name or flags is not correct. "
	"Possible synthax are \'-f\', \'-f;--foo\', "
	"\'--foo\', \'bar\'");
	}

	if (long_key != -1) {
	arg->name = tmp_keys[long_key];
	arg->name.erase(0, 2);
	} else if (short_key != -1) {
	arg->name = tmp_keys[short_key];
	arg->name.erase(0, 1);
	} else {
	arg->name = tmp_keys[0];
	pos_args.push_back(arg);
	arg->required = (nargs != _one_if_possible);
	arg->is_positional = true;
	}

	arguments[arg->name] = arg;

	if (!arg->is_positional) {
	if (short_key != -1) {
	std::string key = tmp_keys[short_key];
	key_args[key] = arg;
	arg->keys.push_back(key);
	}

	if (long_key != -1) {
	std::string key = tmp_keys[long_key];
	key_args[key] = arg;
	arg->keys.push_back(key);
	}
	}

	return *arg;
	}

	#if not HAVE_STRDUP
	static char * strdup(const char * str) {
	size_t len = strlen(str);
	auto * x = (char )malloc(len + 1); / 1 for the null terminator */
	if (!x)
	return nullptr; /* malloc could not allocate memory */
	memcpy(x, str, len + 1); /* copy the string into the new buffer */
	return x;
	}
	#endif

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::parse(int & argc, char **& argv, int flags,
	bool parse_help) {
	bool stop_in_not_parsed = flags & _stop_on_not_parsed;
	bool remove_parsed = flags & _remove_parsed;

	std::vector<std::string> argvs;

	argvs.reserve(argc);
	for (int i = 0; i < argc; ++i) {
	argvs.emplace_back(argv[i]);
	}

	unsigned int current_position = 0;
	if (this->program_name == "" && argc > 0) {
	std::string prog = argvs[current_position];
	const char * c_prog = prog.c_str();
	char * c_prog_tmp = strdup(c_prog);
	std::string base_prog(basename(c_prog_tmp));
	this->program_name = base_prog;
	std::free(c_prog_tmp);
	}

	std::queue<_Argument *> positional_queue;
	for (auto it = pos_args.begin(); it != pos_args.end(); ++it)
	positional_queue.push(*it);

	std::vector<int> argvs_to_remove;
	++current_position; // consume argv[0]
	while (current_position < argvs.size()) {
	std::string arg = argvs[current_position];
	++current_position;

	auto key_it = key_args.find(arg);

	bool is_positional = false;
	_Argument * argument_ptr = nullptr;
	if (key_it == key_args.end()) {
	if (positional_queue.empty()) {
	if (stop_in_not_parsed)
	this->_exit("Argument " + arg + " not recognized", EXIT_FAILURE);
	continue;
	} else {
	argument_ptr = positional_queue.front();
	is_positional = true;
	--current_position;
	}
	} else {
	argument_ptr = key_it->second;
	}

	if (remove_parsed && !is_positional && argument_ptr->name != "help") {
	argvs_to_remove.push_back(current_position - 1);
	}

	_Argument & argument = *argument_ptr;

	unsigned int min_nb_val = 0, max_nb_val = 0;
	switch (argument.nargs) {
	case _one_if_possible:
	max_nb_val = 1;
	break; // "?"
	case _at_least_one:
	min_nb_val = 1; // "+"
	/* FALLTHRU */
	/* [[fallthrough]]; un-comment when compiler will get it*/
	case _any:
	max_nb_val = argc - current_position;
	break; // "*"
	default:
	min_nb_val = max_nb_val = argument.nargs; // "N"
	}

	std::vector<std::string> values;
	unsigned int arg_consumed = 0;
	if (max_nb_val <= (argc - current_position)) {
	for (; arg_consumed < max_nb_val; ++arg_consumed) {
	std::string v = argvs[current_position];
	++current_position;
	bool is_key = key_args.find(v) != key_args.end();
	bool is_good_type = checkType(argument.type, v);

	if (!is_key && is_good_type) {
	values.push_back(v);
	if (remove_parsed)
	argvs_to_remove.push_back(current_position - 1);
	} else {
	// unconsume not parsed argument for optional
	if (!is_positional \|\| is_key)
	--current_position;
	break;
	}
	}
	}

	if (arg_consumed < min_nb_val) {
	if (!is_positional) {
	this->_exit("Not enought values for the argument " + argument.name +
	" where provided",
	EXIT_FAILURE);
	} else {
	if (stop_in_not_parsed)
	this->_exit("Argument " + arg + " not recognized", EXIT_FAILURE);
	}
	} else {
	if (is_positional)
	positional_queue.pop();

	if (!argument.parsed) {
	success_parsed[argument.name] = &argument;
	argument.parsed = true;
	if ((argument.nargs == _one_if_possible \|\| argument.nargs == 0) &&
	arg_consumed == 0) {
	if (argument.has_const)
	argument.setToConst();
	else if (argument.has_default)
	argument.setToDefault();
	} else {
	argument.setValues(values);
	}
	} else {
	this->_exit("Argument " + argument.name +
	" already present in the list of argument",
	EXIT_FAILURE);
	}
	}
	}

	for (auto ait = arguments.begin(); ait != arguments.end(); ++ait) {
	_Argument & argument = *(ait->second);
	if (!argument.parsed) {
	if (argument.has_default) {
	argument.setToDefault();
	success_parsed[argument.name] = &argument;
	}

	if (argument.required) {
	this->_exit("Argument " + argument.name + " required but not given!",
	EXIT_FAILURE);
	}
	}
	}

	// removing the parsed argument if remove_parsed is true
	if (argvs_to_remove.size()) {
	std::vector<int>::const_iterator next_to_remove = argvs_to_remove.begin();
	for (int i = 0, c = 0; i < argc; ++i) {
	if (next_to_remove == argvs_to_remove.end() \|\| i != *next_to_remove) {
	argv[c] = argv[i];
	++c;
	} else {
	if (next_to_remove != argvs_to_remove.end())
	++next_to_remove;
	}
	}

	argc -= argvs_to_remove.size();
	}

	this->argc = &argc;
	this->argv = &argv;

	if (this->arguments["help"]->parsed && parse_help) {
	this->_exit();
	}
	}

	/* -------------------------------------------------------------------------- */
	bool ArgumentParser::checkType(ArgumentType type,
	const std::string & value) const {
	std::stringstream sstr(value);
	switch (type) {
	case _string: {
	std::string s;
	sstr >> s;
	break;
	}
	case _float: {
	double d;
	sstr >> d;
	break;
	}
	case _integer: {
	long int i;
	sstr >> i;
	break;
	}
	case _boolean: {
	bool b;
	sstr >> b;
	break;
	}
	}

	return (sstr.fail() == false);
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::printself(std::ostream & stream) const {
	for (auto it = success_parsed.begin(); it != success_parsed.end(); ++it) {
	const Argument & argument = *(it->second);
	argument.printself(stream);
	stream << std::endl;
	}
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::print_usage(std::ostream & stream) const {
	stream << "Usage: " << this->program_name;

	// print shorten usage
	for (auto it = arguments.begin(); it != arguments.end(); ++it) {
	const _Argument & argument = *(it->second);
	if (!argument.is_positional) {
	if (!argument.required)
	stream << " [";
	stream << argument.keys[0];
	this->print_usage_nargs(stream, argument);
	if (!argument.required)
	stream << "]";
	}
	}

	for (auto it = pos_args.begin(); it != pos_args.end(); ++it) {
	const _Argument & argument = **it;
	this->print_usage_nargs(stream, argument);
	}

	stream << std::endl;
	}

	/* -------------------------------------------------------------------------- */
	void ArgumentParser::print_usage_nargs(std::ostream & stream,
	const _Argument & argument) const {
	std::string u_name = to_upper(argument.name);
	switch (argument.nargs) {
	case _one_if_possible:
	stream << " [" << u_name << "]";
	break;
	case _at_least_one:
	stream << " " << u_name;
	/* FALLTHRU */
	/* [[fallthrough]]; un-comment when compiler will get it */
	case _any:
	stream << " [" << u_name << " ...]";
	break;
	default:
	for (int i = 0; i < argument.nargs; ++i) {
	stream << " " << u_name;
	}
	}
	}

	void ArgumentParser::print_help(std::ostream & stream) const {
	this->print_usage(stream);
	if (!pos_args.empty()) {
	stream << std::endl;
	stream << "positional arguments:" << std::endl;
	for (auto it = pos_args.begin(); it != pos_args.end(); ++it) {
	const _Argument & argument = **it;
	this->print_help_argument(stream, argument);
	}
	}

	if (!key_args.empty()) {
	stream << std::endl;
	stream << "optional arguments:" << std::endl;
	for (auto it = arguments.begin(); it != arguments.end(); ++it) {
	const _Argument & argument = *(it->second);
	if (!argument.is_positional) {
	this->print_help_argument(stream, argument);
	}
	}
	}
	}

	void ArgumentParser::print_help_argument(std::ostream & stream,
	const _Argument & argument) const {
	std::string key("");
	if (argument.is_positional)
	key = argument.name;
	else {
	std::stringstream sstr;
	for (unsigned int i = 0; i < argument.keys.size(); ++i) {
	if (i != 0)
	sstr << ", ";
	sstr << argument.keys[i];
	this->print_usage_nargs(sstr, argument);
	}
	key = sstr.str();
	}

	stream << " " << std::left << std::setw(15) << key << " " << argument.help;
	argument.printDefault(stream);

	stream << std::endl;
	}
	} // namespace cppargparse

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