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// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License
#pragma once
#include "Data/JsonVariantAs.hpp"
#include "Polyfills/attributes.hpp"
#include "StringTraits/StringTraits.hpp"
#include "TypeTraits/EnableIf.hpp"
namespace ArduinoJson {
namespace Internals {
// Forward declarations.
class JsonArraySubscript;
template <typename TKey>
class JsonObjectSubscript;
template <typename TImpl>
class JsonVariantSubscripts {
public:
// Mimics an array or an object.
// Returns the size of the array or object if the variant has that type.
// Returns 0 if the variant is neither an array nor an object
size_t size() const {
return impl()->template as<JsonArray>().size() +
impl()->template as<JsonObject>().size();
}
// Mimics an array.
// Returns the element at specified index if the variant is an array.
// Returns JsonVariant::invalid() if the variant is not an array.
FORCE_INLINE const JsonArraySubscript operator[](size_t index) const;
FORCE_INLINE JsonArraySubscript operator[](size_t index);
// Mimics an object.
// Returns the value associated with the specified key if the variant is
// an object.
// Return JsonVariant::invalid() if the variant is not an object.
//
// const JsonObjectSubscript operator[](TKey) const;
// TKey = const std::string&, const String&
template <typename TString>
FORCE_INLINE
typename EnableIf<StringTraits<TString>::has_equals,
const JsonObjectSubscript<const TString &> >::type
operator[](const TString &key) const {
return impl()->template as<JsonObject>()[key];
}
//
// const JsonObjectSubscript operator[](TKey) const;
// TKey = const std::string&, const String&
template <typename TString>
FORCE_INLINE typename EnableIf<StringTraits<TString>::has_equals,
JsonObjectSubscript<const TString &> >::type
operator[](const TString &key) {
return impl()->template as<JsonObject>()[key];
}
//
// JsonObjectSubscript operator[](TKey);
// TKey = const char*, const char[N], const FlashStringHelper*
template <typename TString>
FORCE_INLINE typename EnableIf<StringTraits<const TString *>::has_equals,
JsonObjectSubscript<const TString *> >::type
operator[](const TString *key) {
return impl()->template as<JsonObject>()[key];
}
//
// JsonObjectSubscript operator[](TKey);
// TKey = const char*, const char[N], const FlashStringHelper*
template <typename TString>
FORCE_INLINE
typename EnableIf<StringTraits<TString *>::has_equals,
const JsonObjectSubscript<const TString *> >::type
operator[](const TString *key) const {
return impl()->template as<JsonObject>()[key];
}
private:
const TImpl *impl() const {
return static_cast<const TImpl *>(this);
}
};
}
}
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