dwrswr/cpp-module-06-guide

1#include "ScalarConverter.hpp"2#include <cctype>3#include <climits>4#include <cstdlib>5#include <iomanip>6#include <iostream>7#include <limits>8 9enum e_type10{11	CHAR_LIT,12	INT_LIT,13	FLOAT_LIT,14	DOUBLE_LIT,15	INVALID_LIT16};17 18ScalarConverter::ScalarConverter(void) {}19 20ScalarConverter::ScalarConverter(const ScalarConverter &src)21{22	(void)src;23}24 25ScalarConverter::~ScalarConverter(void) {}26 27ScalarConverter	&ScalarConverter::operator=(const ScalarConverter &rhs)28{29	(void)rhs;30	return (*this);31}32 33static bool	isNumber(const std::string &s, bool &dot)34{35	size_t	i = 0;36	size_t	digits = 0;37 38	dot = false;39	if (i < s.length() && (s[i] == '+' || s[i] == '-'))40		i++;41	while (i < s.length())42	{43		if (std::isdigit(static_cast<unsigned char>(s[i])))44			digits++;45		else if (s[i] == '.' && !dot)46			dot = true;47		else48			return (false);49		i++;50	}51	return (digits > 0);52}53 54static e_type	detect(const std::string &s)55{56	bool	dot;57 58	if (s.length() == 3 && s[0] == '\'' && s[2] == '\'')59		return (CHAR_LIT);60	if (s.length() == 1 && !std::isdigit(s[0]))61		return (CHAR_LIT);62	if (s == "nanf" || s == "+inff" || s == "-inff")63		return (FLOAT_LIT);64	if (s == "nan" || s == "+inf" || s == "-inf")65		return (DOUBLE_LIT);66	if (isNumber(s, dot))67		return (dot ? DOUBLE_LIT : INT_LIT);68	if (s.length() > 1 && s[s.length() - 1] == 'f'69		&& isNumber(s.substr(0, s.length() - 1), dot))70		return (FLOAT_LIT);71	return (INVALID_LIT);72}73 74static void	printChar(double value)75{76	std::cout << "char: ";77	if (value != value || value < CHAR_MIN || value > CHAR_MAX)78		std::cout << "impossible" << std::endl;79	else if (!std::isprint(static_cast<unsigned char>(static_cast<char>(value))))80		std::cout << "Non displayable" << std::endl;81	else82		std::cout << "'" << static_cast<char>(value) << "'" << std::endl;83}84 85static void	printInt(double value)86{87	std::cout << "int: ";88	if (value != value || value < INT_MIN || value > INT_MAX)89		std::cout << "impossible" << std::endl;90	else91		std::cout << static_cast<int>(value) << std::endl;92}93 94static void	printFloat(double value, bool pseudo)95{96	std::cout << "float: ";97	if (!pseudo && (value != value98			|| value < -std::numeric_limits<float>::max()99			|| value > std::numeric_limits<float>::max()))100		std::cout << "impossible" << std::endl;101	else102		std::cout << std::fixed << std::setprecision(1)103			<< static_cast<float>(value) << "f" << std::endl;104}105 106static void	printDouble(double value, bool pseudo)107{108	std::cout << "double: ";109	if (!pseudo && (value != value110			|| value < -std::numeric_limits<double>::max()111			|| value > std::numeric_limits<double>::max()))112		std::cout << "impossible" << std::endl;113	else114		std::cout << std::fixed << std::setprecision(1) << value << std::endl;115}116 117void	ScalarConverter::convert(const std::string &literal)118{119	e_type		type = detect(literal);120	std::string	body = literal;121	double		value = 0.0;122	bool		pseudo = false;123 124	if (type == INVALID_LIT)125	{126		std::cout << literal << " is not a char, an int, a float nor a double."127			<< std::endl;128		return ;129	}130	if (type == CHAR_LIT)131		value = static_cast<double>(literal.length() == 3 ? literal[1] : literal[0]);132	else133	{134		if (type == FLOAT_LIT)135			body = literal.substr(0, literal.length() - 1);136		pseudo = (body == "nan" || body == "+inf" || body == "-inf");137		value = std::strtod(body.c_str(), NULL);138	}139	printChar(value);140	printInt(value);141	printFloat(value, pseudo);142	printDouble(value, pseudo);143}144