fork download
copy 
  1. #ifdef _MSC_VER
  2.     #define _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
  3. #endif
  4.  
  5. #include <cstddef>
  6. #include <cstdlib>
  7. #include <iostream>
  8. #include <string>
  9. #include <algorithm>
  10. #include <regex>
  11. #include <codecvt>
  12.  
  13. #ifdef _WIN32
  14.     #if !defined(NOMINMAX)
  15.         #define NOMINMAX
  16.     #endif
  17.     #if !defined(WIN32_LEAN_AND_MEAN)
  18.         #define WIN32_LEAN_AND_MEAN
  19.     #endif
  20.     #include <Windows.h>
  21. #endif
  22.  
  23. auto main() -> int
  24. {
  25.     #ifdef _WIN32
  26.         SetConsoleOutputCP(CP_UTF8);
  27.     #endif
  28.  
  29.     std::string json_string  = "Json mit dem UE [u]00fc, dem AE [u]00e4 und der Kuh [u]1f42e ;-)";
  30.  
  31.     std::regex unicode_regex("\\[u\\]([0-9abcdefABCDEF]{2,8})");
  32.     std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> convert;
  33.  
  34.     std::string utf8_string;
  35.     std::size_t i = 0;
  36.  
  37.     std::for_each(
  38.         std::sregex_iterator{
  39.             std::cbegin(json_string),
  40.             std::cend(json_string),
  41.             unicode_regex
  42.         },
  43.         std::sregex_iterator{},
  44.         [&](std::smatch match){
  45.             // JSON-String von letzter Position bis zum Match anhängen.
  46.             utf8_string.append(json_string.substr(i, match.position() - i));
  47.             // Submatch via strtoul in char32_t umwandeln, nach UTF-8
  48.             // konvertieren und anhängen.
  49.             utf8_string.append(
  50.                 convert.to_bytes(
  51.                     std::strtoul(match.str(1).c_str(), nullptr, 16)
  52.                 )
  53.             );
  54.             i = match.position() + match.length();
  55.         }
  56.     );
  57.     // Rest des JSON-String anhängen.
  58.     utf8_string.append(json_string.substr(i));
  59.  
  60.     std::cout << json_string << std::endl;
  61.     std::cout << utf8_string << std::endl;
  62. }
Success #stdin #stdout 0s 4196KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Json mit dem UE [u]00fc, dem AE [u]00e4 und der Kuh [u]1f42e ;-)
Json mit dem UE ü, dem AE ä und der Kuh 🐮 ;-)
https://ideone.com/9REf7I
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!