strutil.cpp

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/*
 * libxcks
 * Copyright (C) 2022 Julien Couot
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
//---------------------------------------------------------------------------
#include <sstream>
#include <algorithm>
#include <iomanip>
#include <cctype>
 
#include "strutil.hpp"
#include "libxcks/defs.hpp"
//---------------------------------------------------------------------------
 
 
using namespace std;
//---------------------------------------------------------------------------
 
 
namespace libxcks
{
//###########################################################################
// Trim functions.
// From https://stackoverflow.com/questions/216823/how-to-trim-a-stdstring
//###########################################################################
 
void ltrim(std::string &s)
{
  s.erase(s.begin(), find_if(s.begin(), s.end(), [](unsigned char ch) {
    return !isspace(ch);
  }));
}
//---------------------------------------------------------------------------
 
 
void rtrim(std::string &s)
{
  s.erase(find_if(s.rbegin(), s.rend(), [](unsigned char ch) {
    return !isspace(ch);
  }).base(), s.end());
}
//---------------------------------------------------------------------------
 
 
void trim(std::string &s)
{
  ltrim(s);
  rtrim(s);
}
//---------------------------------------------------------------------------
 
 
std::string ltrim_copy(std::string s)
{
  ltrim(s);
  return s;
}
//---------------------------------------------------------------------------
 
 
std::string rtrim_copy(std::string s)
{
  rtrim(s);
  return s;
}
//---------------------------------------------------------------------------
 
 
std::string trim_copy(std::string s)
{
  trim(s);
  return s;
}
//---------------------------------------------------------------------------
 
 
 
//###########################################################################
// Replacement functions.
//###########################################################################
 
// From https://stackoverflow.com/a/24315631
std::string replaceAllCopy(std::string str, const std::string& from, const std::string& to)
{
  size_t start_pos = 0;
  while ((start_pos = str.find(from, start_pos)) != string::npos)
  {
    str.replace(start_pos, from.length(), to);
    start_pos += to.length();
  }
  return str;
}
//---------------------------------------------------------------------------
 
 
void replaceAll(std::string& str, const std::string& from, const std::string& to)
{
  size_t start_pos = 0;
  while ((start_pos = str.find(from, start_pos)) != string::npos)
  {
    str.replace(start_pos, from.length(), to);
    start_pos += to.length();
  }
}
//---------------------------------------------------------------------------
 
 
 
//###########################################################################
// Comparison functions.
//###########################################################################
 
bool stringICompare(const std::string & str1, const std::string &str2)
{
  return ((str1.size() == str2.size()) &&
          equal(str1.cbegin(), str1.cend(), str2.cbegin(),
                     [](const unsigned char& c1, const unsigned char& c2) {
                          return (c1 == c2 || toupper(c1) == toupper(c2)); }));
}
//---------------------------------------------------------------------------
 
 
 
//###########################################################################
// Explicit conversion functions for std::filesystem::path::u8string
// From http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r2.html
// std::filesystem::path p = ...;
// std::string s = from_u8string(p.u8string());  // C++17 or C++20
//###########################################################################
 
std::string from_u8string(const std::string &s)
{
  return s;
}
 
 
//---------------------------------------------------------------------------
std::string from_u8string(std::string &&s)
{
  return move(s);
}
//---------------------------------------------------------------------------
 
 
#if defined(__cpp_lib_char8_t)
std::string from_u8string(const std::u8string &s)
{
  return string(s.begin(), s.end());
}
//---------------------------------------------------------------------------
#endif
 
 
 
//###########################################################################
// Date/time conversion.
//###########################################################################
 
time_t parseISO8601(const std::string& iso8601)
{
  time_t res = Invalid_DateTime;
  {
    istringstream ss(iso8601);
    tm t = {};
    ss >> std::get_time(&t, "%Y-%m-%dT%H:%M:%S");
    if (!ss.fail())
      res = mktime(&t);
  }
  if (res == Invalid_DateTime)
  {
    istringstream ss(iso8601);
    tm t = {};
    ss >> std::get_time(&t, "%Y%m%dT%H%M%S");
    if (!ss.fail())
      res = mktime(&t);
  }
  if (res == Invalid_DateTime)
  {
    istringstream ss(iso8601);
    tm t = {};
    ss >> std::get_time(&t, "%Y-%m-%dT%H:%M:%SZ");
    if (!ss.fail())
      res = mktime(&t);
  }
  if (res == Invalid_DateTime)
  {
    istringstream ss(iso8601);
    tm t = {};
    ss >> std::get_time(&t, "%Y%m%dT%H%M%SZ");
    if (!ss.fail())
      res = mktime(&t);
  }
 
  return res;
}
//---------------------------------------------------------------------------
 
 
//###########################################################################
// XML utilities.
//###########################################################################
 
std::string escapeForXML(const std::string& str)
{
  string res = str;
 
  replaceAll(res, "&", "&amp;");
  replaceAll(res, "\"", "&quot;");
  replaceAll(res, "'", "&apos;");
  replaceAll(res, "<", "&lt;");
  replaceAll(res, ">", "&gt;");
 
  return res;
}
//---------------------------------------------------------------------------
 
}  // namespace libxcks
//---------------------------------------------------------------------------