cppcheck/lib/mathlib.h

138 lines
5.0 KiB
C++

/*
* 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