简单的JSON字符串转义为C ++？ [英] Simple JSON string escape for C++?

问题描述

我有一个非常简单的程序，输出简单的JSON字符串，我手动并置在一起，并通过std :: cout流输出（输出真的是那么简单），但我有字符串可以包含双引号，卷曲大括号和其他可能破坏JSON字符串的字符。所以我需要一个库（或一个函数更准确）转义字符串相应的JSON标准，尽可能轻量级，没有更多，没有更少。

很少有库用于将整个对象编码为JSON，但是我的程序是900行的cpp文件，我宁愿不依赖于一个比我的程序只是为了实现这样简单的程序。 / p>

解决方案

更新：不要使用！ vog提供了一个更完整（同样紧凑）的解决方案： http://stackoverflow.com/a/33799784

下面是一个非常简单的开始，它不处理无效的unicode字符。如果你不希望在你的输出中有它们，请随意使用...

  #include< string> ; 
 #include< sstream> 
 
 std :: string escapeJsonString（const std :: string& input）{
 std :: ostringstream ss; 
 for（auto iter = input.cbegin（）; iter！= input.cend（）; iter ++）{
 // C ++ 98/03：
 // for（std： ：string :: const_iterator iter = input.begin（）; iter！= input.end（）; iter ++）{
 switch（* iter）{
 case'\\'：ss< < \\\\;打破; 
 case''：ss< <\\\;打破; 
 case'/'：ss<< \\ /;打破; 
 case'\b'：ss<< \\b;打破; 
 case'\f'：ss<< \\F;打破; 
 case'\\\
'：ss<< \\\\
;打破; 
 case'\r'：ss<< \\r;打破; 
 case'\t'：ss<< \\t;打破; 
默认值：ss<< * iter;打破; 
} 
} 
 return ss.str（）; 
} 
  

I'm having a very simple program that outputs simple JSON string that I manually concatenate together and output through the std::cout stream (the output really is that simple) but I have strings that could contain double-quotes, curly-braces and other characters that could break the JSON string. So I need a library (or a function more accurately) to escape strings accordingly to the JSON standard, as lightweight as possible, nothing more, nothing less.

I found a few libraries that are used to encode whole objects into JSON but having in mind my program is 900 line cpp file, I rather want to not rely on a library that is few times bigger then my program just to achieve something as simple as this.

解决方案

Update: Don't use this! vog provides a much more complete (and equally compact) solution down below: http://stackoverflow.com/a/33799784

Here's a very simple start, it doesn't handle invalid unicode characters though. If you don't expect any of them in your output, feel free to use this...

#include <string>
#include <sstream>

std::string escapeJsonString(const std::string& input) {
    std::ostringstream ss;
    for (auto iter = input.cbegin(); iter != input.cend(); iter++) {
    //C++98/03:
    //for (std::string::const_iterator iter = input.begin(); iter != input.end(); iter++) {
        switch (*iter) {
            case '\\': ss << "\\\\"; break;
            case '"': ss << "\\\""; break;
            case '/': ss << "\\/"; break;
            case '\b': ss << "\\b"; break;
            case '\f': ss << "\\f"; break;
            case '\n': ss << "\\n"; break;
            case '\r': ss << "\\r"; break;
            case '\t': ss << "\\t"; break;
            default: ss << *iter; break;
        }
    }
    return ss.str();
}

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