#pragma once
#include "ZXAlgorithms.h"
#include <cstring>
#include <optional>
#include <string>
#include <string_view>
namespace ZXing {
std::string JsonEscapeStr(std::string_view str);
std::string JsonUnEscapeStr(std::string_view str);
template<typename T>
inline std::string JsonProp(std::string_view key, const T& val, const T& ignore = {})
{
#define ZX_JSON_KEY_VAL(...) StrCat("\"", key, "\":", __VA_ARGS__, ',')
if constexpr (std::is_same_v<T, bool>)
return val != ignore ? ZX_JSON_KEY_VAL(val ? "true" : "false") : "";
else if constexpr (std::is_arithmetic_v<T>)
return val != ignore ? ZX_JSON_KEY_VAL(std::to_string(val)) : "";
else if constexpr (std::is_convertible_v<T, std::string_view>)
return std::string_view(val) != std::string_view(ignore) ? ZX_JSON_KEY_VAL("\"", JsonEscapeStr(val), "\"") : "";
else
static_assert("unsupported JSON value type");
#undef ZX_JSON_KEY_VAL
}
std::string_view JsonFind(std::string_view json, std::string_view key);
template <typename T>
inline std::optional<T> JsonGet(std::string_view json, std::string_view key)
{
auto str = JsonFind(json, key);
if (!str.data())
return std::nullopt;
if constexpr (std::is_same_v<bool, T>)
return str.empty() || Contains("1tT", str.front()) ? std::optional(true) : std::nullopt;
else if constexpr (std::is_arithmetic_v<T>)
return str.empty() ? std::nullopt : std::optional(FromString<T>(str));
else if constexpr (std::is_same_v<std::string, T>)
return JsonUnEscapeStr(str);
else
static_assert("unsupported JSON value type");
}
}