Implemented reference semantics for JsonVariant

src/ArduinoJson/Data/JsonVariantData.hpp

@@ -0,0 +1,181 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "../Numbers/parseFloat.hpp"
+#include "../Numbers/parseInteger.hpp"
+#include "JsonVariantContent.hpp"
+#include "JsonVariantType.hpp"
+
+namespace ArduinoJson {
+namespace Internals {
+
+struct JsonVariantData {
+  JsonVariantType type;
+  JsonVariantContent content;
+
+  void setBoolean(bool value) {
+    type = JSON_BOOLEAN;
+    content.asInteger = static_cast<JsonUInt>(value);
+  }
+
+  void setFloat(JsonFloat value) {
+    type = JSON_FLOAT;
+    content.asFloat = value;
+  }
+
+  void setInteger(JsonInteger value) {
+    if (value > 0)
+      setPostiveInteger(static_cast<JsonUInt>(value));
+    else
+      setNegativeInteger(static_cast<JsonUInt>(-value));
+  }
+
+  void setNegativeInteger(JsonUInt value) {
+    type = JSON_NEGATIVE_INTEGER;
+    content.asInteger = value;
+  }
+
+  void setPostiveInteger(JsonUInt value) {
+    type = JSON_POSITIVE_INTEGER;
+    content.asInteger = value;
+  }
+
+  void setString(const char *value) {
+    type = JSON_STRING;
+    content.asString = value;
+  }
+
+  void setRaw(const char *data, size_t size) {
+    type = JSON_RAW;
+    content.asRaw.data = data;
+    content.asRaw.size = size;
+  }
+
+  void setNull() {
+    type = JSON_NULL;
+  }
+
+  void setArray(JsonArrayData &array) {
+    type = JSON_ARRAY;
+    content.asArray = &array;
+  }
+
+  void setObject(JsonObjectData &object) {
+    type = JSON_OBJECT;
+    content.asObject = &object;
+  }
+
+  JsonArrayData *asArray() const {
+    return type == JSON_ARRAY ? content.asArray : 0;
+  }
+
+  JsonObjectData *asObject() const {
+    return type == JSON_OBJECT ? content.asObject : 0;
+  }
+
+  template <typename T>
+  T asInteger() const {
+    switch (type) {
+      case JSON_NULL:
+      case JSON_RAW:
+        return 0;
+      case JSON_POSITIVE_INTEGER:
+      case JSON_BOOLEAN:
+        return T(content.asInteger);
+      case JSON_NEGATIVE_INTEGER:
+        return T(~content.asInteger + 1);
+      case JSON_STRING:
+        return parseInteger<T>(content.asString);
+      default:
+        return T(content.asFloat);
+    }
+  }
+
+  template <typename T>
+  T asFloat() const {
+    switch (type) {
+      case JSON_NULL:
+      case JSON_RAW:
+        return 0;
+      case JSON_POSITIVE_INTEGER:
+      case JSON_BOOLEAN:
+        return static_cast<T>(content.asInteger);
+      case JSON_NEGATIVE_INTEGER:
+        return -static_cast<T>(content.asInteger);
+      case JSON_STRING:
+        return parseFloat<T>(content.asString);
+      default:
+        return static_cast<T>(content.asFloat);
+    }
+  }
+
+  const char *asString() const {
+    return type == JSON_STRING ? content.asString : NULL;
+  }
+
+  bool isArray() const {
+    return type == Internals::JSON_ARRAY;
+  }
+
+  bool isBoolean() const {
+    return type == JSON_BOOLEAN;
+  }
+
+  bool isFloat() const {
+    return type == JSON_FLOAT || type == JSON_POSITIVE_INTEGER ||
+           type == JSON_NEGATIVE_INTEGER;
+  }
+
+  bool isInteger() const {
+    return type == JSON_POSITIVE_INTEGER || type == JSON_NEGATIVE_INTEGER;
+  }
+
+  bool isNull() const {
+    return type == JSON_NULL;
+  }
+
+  bool isObject() const {
+    return type == Internals::JSON_OBJECT;
+  }
+
+  bool isString() const {
+    return type == Internals::JSON_STRING;
+  }
+
+  template <typename Visitor>
+  void visit(Visitor &visitor) const {
+    switch (type) {
+      case JSON_FLOAT:
+        return visitor.acceptFloat(content.asFloat);
+
+      case JSON_ARRAY:
+        return visitor.acceptArray(*content.asArray);
+
+      case JSON_OBJECT:
+        return visitor.acceptObject(*content.asObject);
+
+      case JSON_STRING:
+        return visitor.acceptString(content.asString);
+
+      case JSON_RAW:
+        return visitor.acceptRawJson(content.asRaw.data, content.asRaw.size);
+
+      case JSON_NEGATIVE_INTEGER:
+        return visitor.acceptNegativeInteger(content.asInteger);
+
+      case JSON_POSITIVE_INTEGER:
+        return visitor.acceptPositiveInteger(content.asInteger);
+
+      case JSON_BOOLEAN:
+        return visitor.acceptBoolean(content.asInteger != 0);
+
+      default:
+        return visitor.acceptNull();
+    }
+  }
+};
+}  // namespace Internals
+}  // namespace ArduinoJson