Util.h

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/*
 * This file is part of OpenModelica.
 *
 * Copyright (c) 1998-2026, Open Source Modelica Consortium (OSMC),
 * c/o Linköpings universitet, Department of Computer and Information Science,
 * SE-58183 Linköping, Sweden.
 *
 * All rights reserved.
 *
 * THIS PROGRAM IS PROVIDED UNDER THE TERMS OF AGPL VERSION 3 LICENSE OR
 * THIS OSMC PUBLIC LICENSE (OSMC-PL) VERSION 1.8.
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THIS PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THE OSMC PUBLIC LICENSE OR THE GNU AGPL
 * VERSION 3, ACCORDING TO RECIPIENTS CHOICE.
 *
 * The OpenModelica software and the OSMC (Open Source Modelica Consortium)
 * Public License (OSMC-PL) are obtained from OSMC, either from the above
 * address, from the URLs:
 * http://www.openmodelica.org or
 * https://github.com/OpenModelica/ or
 * http://www.ida.liu.se/projects/OpenModelica,
 * and in the OpenModelica distribution.
 *
 * GNU AGPL version 3 is obtained from:
 * https://www.gnu.org/licenses/licenses.html#GPL
 *
 * This program is distributed WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE, EXCEPT AS EXPRESSLY SET FORTH
 * IN THE BY RECIPIENT SELECTED SUBSIDIARY LICENSE CONDITIONS OF OSMC-PL.
 *
 * See the full OSMC Public License conditions for more details.
 *
 */
 
#ifndef _OMS_UTIL_H_
#define _OMS_UTIL_H_
 
#include <algorithm>
#include <cctype>
#include <locale>
#include <math.h>
#include <sstream>
#include <string>
#include <random>
 
// trim from start (in place)
// https://stackoverflow.com/a/217605/7534030
static inline void ltrim(std::string &s)
{
  s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](int ch) { return !std::isspace(ch); }));
}
 
// trim from end (in place)
// https://stackoverflow.com/a/217605/7534030
static inline void rtrim(std::string &s)
{
  s.erase(std::find_if(s.rbegin(), s.rend(), [](int ch) { return !std::isspace(ch); }).base(), s.end());
}
 
// trim from both ends (in place)
// https://stackoverflow.com/a/217605/7534030
static inline void trim(std::string &s)
{
  ltrim(s);
  rtrim(s);
}
 
const double DOUBLEEQUAL_ABSTOL = 1e-10;
const double DOUBLEEQUAL_RELTOL = 1e-5;
 
// http://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
static inline bool almostEqualRelativeAndAbs(double a, double b, double reltol=DOUBLEEQUAL_RELTOL, double abstol=DOUBLEEQUAL_ABSTOL)
{
  double diff = fabs(a - b);
  if (diff <= abstol)
    return true;
 
  if (diff <= fmax(fabs(a), fabs(b)) * reltol)
    return true;
 
  return false;
}
 
template <class T>
void reverseArray(T* array, unsigned int length)
{
  T tmp;
  for (unsigned int start = 0, end = length-1; start < end; start++, end--)
  {
    tmp = array[start];
    array[start] = array[end];
    array[end] = tmp;
  }
}
 
static inline std::string generateUuid()
{
    std::random_device              rd;
    std::mt19937_64                 gen(rd());
    std::uniform_int_distribution<> dis(0, 15);
    std::uniform_int_distribution<> dis2(8, 11);
    std::stringstream ss;
    int i;
    ss << std::hex;
    for (i = 0; i < 8; i++) {
        ss << dis(gen);
    }
    ss << "-";
    for (i = 0; i < 4; i++) {
        ss << dis(gen);
    }
    ss << "-4";
    for (i = 0; i < 3; i++) {
        ss << dis(gen);
    }
    ss << "-";
    ss << dis2(gen);
    for (i = 0; i < 3; i++) {
        ss << dis(gen);
    }
    ss << "-";
    for (i = 0; i < 12; i++) {
        ss << dis(gen);
    }
    return ss.str().c_str();
}
 
#endif