cppcheck/lib/mathlib.h

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2014 Daniel Marjamäki and Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

//---------------------------------------------------------------------------
#ifndef mathlibH
#define mathlibH
//---------------------------------------------------------------------------

#include <cstdlib>
#include <string>
#include <sstream>
#include <type_traits>
#include "config.h"

/// @addtogroup Core
/// @{

/** @brief simple math functions that uses operands stored in std::string. useful when performing math on tokens. */

class CPPCHECKLIB MathLib {
public:
    typedef long long bigint;
    typedef unsigned long long biguint;

    template < class T = bigint >
    static T toLongNumber(const std::string & str) {
        // hexadecimal numbers:
        if (isHex(str)) {
            if (str[0] == '-') {
                T ret = 0;
                std::istringstream istr(str);
                istr >> std::hex >> ret;
                return ret;
            } else {
                unsigned long long ret = 0;
                std::istringstream istr(str);
                istr >> std::hex >> ret;
                return (T)ret;
            }
        }

        // octal numbers:
        if (isOct(str)) {
            T ret = 0;
            std::istringstream istr(str);
            istr >> std::oct >> ret;
            return ret;
        }

        // binary numbers:
        if (isBin(str)) {
            T ret = 0;
            for (std::string::size_type i = str[0] == '0'?2:3; i < str.length(); i++) {
                ret <<= 1;
                if (str[i] == '1')
                    ret |= 1;
            }
            if (std::is_signed<T>()) {
                if (str[0] == '-')
                    ret = -ret;
            }
            return ret;
        }

        if (isFloat(str))
            return static_cast<T>(std::atof(str.c_str()));

        T ret = 0;
        std::istringstream istr(str);
        istr >> ret;
        return ret;
    }

    template<class T> static std::string toString(T value) {
        std::ostringstream result;
        result << value;
        return result.str();
    }
    static double toDoubleNumber(const std::string & str);

    static bool isInt(const std::string & str);
    static bool isFloat(const std::string &str);
    static bool isNegative(const std::string &str);
    static bool isPositive(const std::string &str);
    static bool isDec(const std::string & str);
    static bool isHex(const std::string& str);
    static bool isOct(const std::string& str);
    static bool isBin(const std::string& str);

    static bool isValidSuffix(std::string::const_iterator it, std::string::const_iterator end);

    static std::string add(const std::string & first, const std::string & second);
    static std::string subtract(const std::string & first, const std::string & second);
    static std::string multiply(const std::string & first, const std::string & second);
    static std::string divide(const std::string & first, const std::string & second);
    static std::string mod(const std::string & first, const std::string & second);
    static std::string calculate(const std::string & first, const std::string & second, char action);

    static std::string sin(const std::string & tok);
    static std::string cos(const std::string & tok);
    static std::string tan(const std::string & tok);
    static std::string abs(const std::string & tok);
    static bool isEqual(const std::string & first, const std::string & second);
    static bool isNotEqual(const std::string & first, const std::string & second);
    static bool isGreater(const std::string & first, const std::string & second);
    static bool isGreaterEqual(const std::string & first, const std::string & second);
    static bool isLess(const std::string & first, const std::string & second);
    static bool isLessEqual(const std::string & first, const std::string & second);
    static bool isNullValue(const std::string &tok);
    /**
     * Return true if given character is 0,1,2,3,4,5,6 or 7.
     * @param c The character to check
     * @return true if given character is octal digit.
     */
    static bool isOctalDigit(char c);
};

template<> CPPCHECKLIB std::string MathLib::toString(double value); // Declare specialization to avoid linker problems

/// @}
//---------------------------------------------------------------------------
#endif // mathlibH