43 lines
1007 B
C++
43 lines
1007 B
C++
#include <iostream>
|
|
#include <utility>
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using json = nlohmann::json;
|
|
|
|
// line and column (both starting at 1) of a byte index in a text
|
|
std::pair<std::size_t, std::size_t> line_column(const std::string& input, std::size_t byte)
|
|
{
|
|
std::size_t line = 1;
|
|
std::size_t column = 1;
|
|
for (std::size_t i = 0; i + 1 < byte && i < input.size(); ++i)
|
|
{
|
|
if (input[i] == '\n')
|
|
{
|
|
++line;
|
|
column = 1;
|
|
}
|
|
else
|
|
{
|
|
++column;
|
|
}
|
|
}
|
|
return {line, column};
|
|
}
|
|
|
|
int main()
|
|
{
|
|
const std::string input = "{\n \"a\": 1,\n \"b\": ]\n}";
|
|
|
|
try
|
|
{
|
|
const json j = json::parse(input);
|
|
std::cout << j << '\n';
|
|
}
|
|
catch (const json::parse_error& e)
|
|
{
|
|
const auto position = line_column(input, e.byte);
|
|
std::cout << e.what() << '\n';
|
|
std::cout << "byte " << e.byte << " = line " << position.first << ", column " << position.second << '\n';
|
|
}
|
|
}
|