#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;
std::string EscapeJsonString(const std::string &s) {
std::ostringstream o;
for (std::string::const_iterator c = s.begin(); c != s.end(); c++) {
//for (auto c = s.cbegin(); c != s.cend(); c++) {
switch (*c) {
case '"': o << "\\\""; break;
case '\\': o << "\\\\"; break;
case '\b': o << "\\b"; break;
case '\f': o << "\\f"; break;
case '\n': o << "\\n"; break;
case '\r': o << "\\r"; break;
case '\t': o << "\\t"; break;
default:
if ('\x00' <= *c && *c <= '\x1f') {
o << "\\u"
<< std::hex << std::setw(4) << std::setfill('0') << (int)*c;
} else {
o << *c;
}
}
}
return o.str();
}
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();
}
std::string escape_json(const std::string &s) {
std::ostringstream o;
for (auto c = s.cbegin(); c != s.cend(); c++) {
switch (*c) {
case '\x00': o << "\\u0000"; break;
case '\x01': o << "\\u0001"; break;
case '\x0a': o << "\\n"; break;
case '\x1f': o << "\\u001f"; break;
case '\x22': o << "\\\""; break;
case '\x5c': o << "\\\\"; break;
default: o << *c;
}
}
return o.str();
}
int main() {
string s = "\tHello''\"''\\ Wor\nld!";
cout << "Hello'''''' World!"<<endl;
cout << escapeJsonString(s)<<endl;
cout << escape_json(s)<<endl;
cout << "test" + EscapeJsonString(s) <<endl;
return 0;
}
