PCTEncoder.h

#ifndef TENDUKE_UTL_PCTENCODER_H
#define TENDUKE_UTL_PCTENCODER_H
 
#include <iomanip>
#include <sstream>
 
namespace tenduke { namespace utl {

class PCTEncoder
{
public:
    virtual ~PCTEncoder() = default;
 
    explicit PCTEncoder()
        : result(), cleanStreamState(nullptr)
    {
        cleanStreamState.copyfmt(result);
    }
 
    virtual std::string encode(const std::string &value)
    {
        for (const auto c : value) {
            if (shouldEncode(c)) {
                pctEncode(c);
            }
            else {
                result << c;
            }
        }
        return result.str();
    }
protected:
    virtual bool shouldEncode(char c)
    {
        return true;
    }
 
    virtual void pctEncode(char c)
    {
        result << '%'
        << std::hex
        << std::uppercase
        << std::setw(2)
        << std::setfill('0')
        << static_cast<int>(static_cast<unsigned char>(c));
 
        result.copyfmt(cleanStreamState);
    }
 
    std::ostringstream result;
private:
    std::ios cleanStreamState;
};
 
}}
 
#endif //TENDUKE_UTL_PCTENCODER_H