d68dac2ce0
Summary: T46426056: Add utility to convert nlohmann::json to NSDictionary. Use same in instagram logging module. Differential Revision: D16798341 fbshipit-source-id: 88923fcbcd1ffbed5a468cee4ba2f9482ba81a97
72 lines
1.9 KiB
Plaintext
72 lines
1.9 KiB
Plaintext
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "FBCxxNlohmannJSONConvert.h"
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#import <objc/runtime.h>
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namespace facebook {
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namespace cxxutils {
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using json = nlohmann::json;
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id convertJSONValue(const json &input);
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NSString *convertToNSString(const std::string &input);
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id convertJSONValue(const json &input)
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{
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// for reference see
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// [github](https://github.com/nlohmann/json/blob/8d6c033f80461123cbfba5e7a3027a9c35ea2eef/include/nlohmann/detail/value_t.hpp#L41)
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using value_t = json::value_t;
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switch (input.type()) {
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case value_t::string: {
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return convertToNSString(input.get<std::string>());
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}
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case value_t::object:
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return convertNlohmannJSONToNSDictionary(input);
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case value_t::array: {
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NSMutableArray<id> *array = [[NSMutableArray alloc] initWithCapacity:input.size()];
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for (auto &elem : input) {
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id obj = convertJSONValue(elem);
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if (obj) {
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[array addObject:obj];
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}
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}
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return array;
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}
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case value_t::boolean:
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return input.get<bool>() ? @YES : @NO;
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case value_t::number_integer:
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return @(input.get<int>());
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case value_t::number_unsigned:
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return @(input.get<uint>());
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case value_t::number_float:
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return @(input.get<float>());
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case value_t::null:
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case value_t::discarded:
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return [NSNull null];
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}
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}
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NSString *convertToNSString(const std::string &str)
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{
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return [[NSString alloc] initWithBytes:str.c_str() length:str.size() encoding:NSUTF8StringEncoding];
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}
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NSDictionary<NSString *, id> *convertNlohmannJSONToNSDictionary(const json &input)
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{
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NSMutableDictionary<NSString *, id> *result = [NSMutableDictionary new];
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for (auto &el : input.items()) {
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const auto key = convertToNSString(el.key());
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id value = convertJSONValue(el.value());
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if (value) {
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result[key] = value;
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}
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}
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return [result copy];
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}
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}
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}
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