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