string.hh

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#pragma once
 
#include <algorithm>
#include <cctype>
#include <locale>
#include <sstream>
#include <string>
 
namespace Dune::Vtk
{
  inline std::string to_upper(std::string input)
  {
    for (auto& c : input)
      c = char(::toupper(int(c)));
    return input;
  }
 
  inline std::string to_lower(std::string input)
  {
    for (auto& c : input)
      c = char(::tolower(int(c)));
    return input;
  }
 
  inline std::string& ltrim(std::string& str)
  {
    auto it =  std::find_if(str.begin(), str.end(), [](char ch)
    {
      return !std::isspace<char>(ch, std::locale::classic());
    });
    str.erase(str.begin() , it);
    return str;
  }
 
  inline std::string& rtrim(std::string& str)
  {
    auto it =  std::find_if(str.rbegin(), str.rend(), [](char ch)
    {
      return !std::isspace<char>(ch, std::locale::classic());
    });
    str.erase(it.base(), str.end());
    return str;
  }
 
  inline std::string& trim(std::string& str)
  {
    return ltrim(rtrim(str));
  }
 
  inline std::string trim_copy(std::string const& str)
  {
    auto s = str;
    return trim(s);
  }
 
 
  template <class InputIter, class T, class Func>
  void split(InputIter first, InputIter end, T const& t, Func f)
  {
    if (first == end)
      return;
 
    while (true) {
      InputIter found = std::find(first, end, t);
      f(first, found);
      if (found == end)
        break;
      first = ++found;
    }
  }
 
  template <class InputIter, class SeparatorIter, class Func>
  void split(InputIter first, InputIter end, SeparatorIter s_first, SeparatorIter s_end, Func f)
  {
    if (first == end)
      return;
 
    while (true) {
      InputIter found = std::find_first_of(first, end, s_first, s_end);
      f(first, found);
      if (found == end)
        break;
      first = ++found;
    }
  }
 
  inline void replaceAll(std::string& str, std::string const& from, std::string const& to)
  {
    if (from.empty())
      return;
    std::size_t start_pos = 0;
    while ((start_pos = str.find(from, start_pos)) != std::string::npos)
    {
      str.replace(start_pos, from.length(), to);
      start_pos += to.length();
    }
  }
 
 
  template <class InputIter>
  std::string join (InputIter first, InputIter end, std::string sep = " ")
  {
    if (first == end)
      return "";
 
    std::ostringstream os;
    os << *first++;
    while (first != end)
      os << sep << *first++;
    return os.str();
  }
 
} // end namespace Dune::Vtk