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#pragma once
#include "jansson_handle.hpp"
#include "base/exception.hpp"
#include "base/string_utils.hpp"
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
#include "3party/jansson/src/jansson.h"
namespace my
{
struct JSONDecRef
{
void operator()(json_t * root) const { json_decref(root); }
};
using JSONPtr = std::unique_ptr<json_t, JSONDecRef>;
inline JSONPtr NewJSONObject() { return JSONPtr(json_object()); }
inline JSONPtr NewJSONArray() { return JSONPtr(json_array()); }
inline JSONPtr NewJSONString(std::string const & s) { return JSONPtr(json_string(s.c_str())); }
class Json
{
JsonHandle m_handle;
public:
DECLARE_EXCEPTION(Exception, RootException);
explicit Json(char const * s)
{
json_error_t jsonError;
m_handle.AttachNew(json_loads(s, 0, &jsonError));
if (!m_handle)
MYTHROW(Exception, (jsonError.line, jsonError.text));
}
json_t * get() const { return m_handle.get(); }
};
json_t * GetJSONObligatoryField(json_t * root, std::string const & field);
json_t * GetJSONOptionalField(json_t * root, std::string const & field);
bool JSONIsNull(json_t * root);
} // namespace my
inline void FromJSON(json_t * root, json_t *& value) { value = root; }
void FromJSONObject(json_t * root, std::string const & field, double & result);
void FromJSONObject(json_t * root, std::string const & field, int & result);
void FromJSONObject(json_t * root, std::string const & field, int64_t & result);
void FromJSONObjectOptionalField(json_t * root, std::string const & field, int & result);
void FromJSONObjectOptionalField(json_t * root, std::string const & field, int64_t & result);
void FromJSONObjectOptionalField(json_t * root, std::string const & field, double & result);
void FromJSONObjectOptionalField(json_t * root, std::string const & field, bool & result,
bool def = false);
void FromJSONObjectOptionalField(json_t * root, std::string const & field, json_t *& result);
void ToJSONObject(json_t & root, std::string const & field, double value);
void ToJSONObject(json_t & root, std::string const & field, int value);
void ToJSONObject(json_t & root, std::string const & field, int64_t value);
void FromJSON(json_t * root, std::string & result);
inline my::JSONPtr ToJSON(std::string const & s) { return my::NewJSONString(s); }
void FromJSONObject(json_t * root, std::string const & field, std::string & result);
void ToJSONObject(json_t & root, std::string const & field, std::string const & value);
template <typename T>
void FromJSONObject(json_t * root, std::string const & field, std::vector<T> & result)
{
auto * arr = my::GetJSONObligatoryField(root, field);
if (!json_is_array(arr))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json array."));
size_t sz = json_array_size(arr);
result.resize(sz);
for (size_t i = 0; i < sz; ++i)
FromJSON(json_array_get(arr, i), result[i]);
}
// The function tries to parse array of values from a value
// corresponding to |field| in a json object corresponding to |root|.
// Returns true when the value is non-null and array is successfully
// parsed. Returns false when there is no such |field| in the |root|
// or the value is null. Also, the method may throw an exception in
// case of json parsing errors.
template <typename T>
bool FromJSONObjectOptional(json_t * root, std::string const & field, std::vector<T> & result)
{
auto * arr = my::GetJSONOptionalField(root, field);
if (!arr || my::JSONIsNull(arr))
{
result.clear();
return false;
}
if (!json_is_array(arr))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json array."));
size_t const sz = json_array_size(arr);
result.resize(sz);
for (size_t i = 0; i < sz; ++i)
FromJSON(json_array_get(arr, i), result[i]);
return true;
}
template <typename T>
void ToJSONObject(json_t & root, std::string const & field, std::vector<T> const & values)
{
auto arr = my::NewJSONArray();
for (auto const & value : values)
json_array_append_new(arr.get(), ToJSON(value).release());
json_object_set_new(&root, field.c_str(), arr.release());
}
void FromJSONObjectOptionalField(json_t * root, std::string const & field, std::string & result);
template <typename T>
void FromJSONObjectOptionalField(json_t * root, std::string const & field, std::vector<T> & result)
{
json_t * arr = my::GetJSONOptionalField(root, field);
if (!arr)
{
result.clear();
return;
}
if (!json_is_array(arr))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json array."));
size_t sz = json_array_size(arr);
result.resize(sz);
for (size_t i = 0; i < sz; ++i)
FromJSON(json_array_get(arr, i), result[i]);
}
struct JSONFreeDeleter
{
void operator()(char * buffer) const { free(buffer); }
};
namespace strings
{
void FromJSONObject(json_t * root, std::string const & field, UniString & result);
void ToJSONObject(json_t & root, std::string const & field, UniString const & value);
}
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