278 lines
7.4 KiB
C++
278 lines
7.4 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2009 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mathlib.h"
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#include <fstream>
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#include <string>
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#include <cstring>
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#include <iostream>
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#include <sstream>
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#include <cstdlib>
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#include <cmath>
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#include <cctype>
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long MathLib::toLongNumber(const std::string &str)
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{
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if (strncmp(str.c_str(), "0x" , 2) == 0
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|| strncmp(str.c_str(), "+0x", 3) == 0
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|| strncmp(str.c_str(), "-0x", 3) == 0)
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{
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return std::strtoul(str.c_str(), '\0', 16);
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}
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if (strncmp(str.c_str(), "0" , 1) == 0
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|| strncmp(str.c_str(), "+0", 2) == 0
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|| strncmp(str.c_str(), "-0", 2) == 0)
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{
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return std::strtoul(str.c_str(), '\0', 8);
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}
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return (str.find("E", 0) != std::string::npos || str.find("e", 0) != std::string::npos)
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? static_cast<long>(std::atof(str.c_str()))
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: std::atol(str.c_str());
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}
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double MathLib::toDoubleNumber(const std::string &str)
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{
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if (strncmp(str.c_str(), "0x", 2) == 0)
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{
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return std::strtoul(str.c_str(), '\0', 16);
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}
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std::istringstream istr(str.c_str());
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double ret;
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istr >> ret;
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return ret;
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}
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template <typename T>
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std::string MathLib::toString(T d)
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{
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std::ostringstream result;
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result << d;
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std::string strResult(result.str());
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if (strResult == "-0"
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|| strResult == "+0"
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|| strResult == "-0."
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|| strResult == "+0.")
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return std::string("0");
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return result.str();
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}
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bool MathLib::isInt(const std::string & s)
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{
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// perform prechecks:
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// ------------------
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// first check, if a point is found, it is an floating point value
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if (s.find(".", 0) != std::string::npos) return false;
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// check for scientific notation e.g. NumberE-Number this is obvious an floating point value
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else if (s.find("E-", 0) != std::string::npos || s.find("e-", 0) != std::string::npos) return false;
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// prechecking has nothing found,...
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// gather information
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enum Representation
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{
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eScientific = 0 // NumberE+Number or NumberENumber
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, eOctal // starts with 0
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, eHex // starts with 0x
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, eDefault // Numbers with a (possible) trailing u or U or l or L for unsigned or long datatypes
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};
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// create an instance
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Representation Mode = eDefault;
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// remember position
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unsigned long n = 0;
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// eat up whitespace
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while (std::isspace(s[n])) ++n;
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// determine type
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if (s.find("E", 0) != std::string::npos)
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{
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Mode = eScientific;
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}
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else if (s.find("0x", n, 2) != std::string::npos)
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{
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Mode = eHex;
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}
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else if (s.length() > 1 && s[0] == '0' && std::isdigit(s[1]))
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{
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Mode = eOctal;
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}
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// check sign
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if (s[n] == '-' || s[n] == '+') ++n;
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// check scientific notation
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if (Mode == eScientific)
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{
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// check digits
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while (std::isdigit(s[n])) ++n;
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// check scientific notation
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if (std::tolower(s[n]) == 'e')
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{
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++n;
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// check positive exponent
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if (s[n] == '+') ++n;
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// floating pointer number e.g. 124E-2
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if (s[n] == '-') return false;
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// check digits of the exponent
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while (std::isdigit(s[n])) ++n;
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}
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}
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// check hex notation
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else if (Mode == eHex)
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{
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++n; // 0
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++n; // x
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while (std::isxdigit(s[n]))
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++n;
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}
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// check octal notation
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else if (Mode == eOctal)
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{
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while (isOctalDigit(s[n]))
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++n;
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}
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else if (Mode == eDefault)
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{
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while (std::isdigit(s[n])) ++n;
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// unsigned or long
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while (std::tolower(s[n]) == 'u' || std::tolower(s[n]) == 'l') ++n;
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}
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// eat up whitespace
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while (std::isspace(s[n]))
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++n;
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// if everything goes good, we are at the end of the string and no digits/character
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// is here --> return true, but if something was found eg. 12E+12AA return false
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if (s[n])
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return false;
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return true;
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}
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std::string MathLib::add(const std::string & first, const std::string & second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second))
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{
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return toString<long>(toLongNumber(first) + toLongNumber(second));
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}
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return toString<double>(toDoubleNumber(first) + toDoubleNumber(second));
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}
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std::string MathLib::subtract(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second))
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{
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return toString<long>(toLongNumber(first) - toLongNumber(second));
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}
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return toString<double>(toDoubleNumber(first) - toDoubleNumber(second));
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}
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std::string MathLib::divide(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second))
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{
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return toString<long>(toLongNumber(first) / toLongNumber(second));
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}
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return toString<double>(toDoubleNumber(first) / toDoubleNumber(second));
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}
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std::string MathLib::multiply(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second))
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{
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return toString<long>(toLongNumber(first) * toLongNumber(second));
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}
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return toString<double>(toDoubleNumber(first) * toDoubleNumber(second));
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}
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std::string MathLib::calculate(const std::string &first, const std::string &second, char action)
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{
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std::string result("0");
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switch (action)
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{
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case '+':
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result = MathLib::add(first, second);
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break;
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case '-':
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result = MathLib::subtract(first, second);
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break;
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case '*':
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result = MathLib::multiply(first, second);
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break;
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case '/':
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result = MathLib::divide(first, second);
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break;
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default:
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std::cerr << "##### If you see this, there is a bug: "
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<< "MathLib::calculate() was called with unknown action '"
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<< action
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<< "' #####"
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<< std::endl;
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break;
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}
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return result;
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}
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std::string MathLib::sin(const std::string &tok)
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{
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return toString<double>(std::sin(toDoubleNumber(tok)));
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}
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std::string MathLib::cos(const std::string &tok)
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{
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return toString<double>(std::cos(toDoubleNumber(tok)));
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}
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std::string MathLib::tan(const std::string &tok)
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{
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return toString<double>(std::tan(toDoubleNumber(tok)));
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}
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std::string MathLib::abs(const std::string &tok)
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{
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return toString<double>(std::abs(toDoubleNumber(tok)));
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}
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bool MathLib::isGreater(const std::string &first, const std::string &second)
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{
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return toDoubleNumber(first) > toDoubleNumber(second);
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}
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bool MathLib::isOctalDigit(char c)
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{
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if (c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7')
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return true;
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return false;
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}
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