/// <summary>
/// Attempt to create JSON node representation from given input.
/// </summary>
/// <remarks>
/// <para>This method uses type information from input to determine which type of
/// nodes seem best suited. Common basic data types are supported along with
/// objects, structures, lists, native arrays and even dictionaries. Dictionary
/// support is limited to those with string type keys (<c>Dictionary<string, YourType>></c>).</para>
/// <para>Input value is simply cloned if it is already a <see cref="JsonNode"/>.</para>
/// </remarks>
/// <example>
/// <para>Create JSON object from a generic dictionary:</para>
/// <code language="csharp"><![CDATA[
/// // Prepare an example data structure.
/// var lookupTable = new Dictionary<string, int>();
/// lookupTable["Player"] = 42;
/// lookupTable["Boss1"] = 72;
/// lookupTable["Whale"] = 128;
///
/// // Convert example data structure into a JSON object.
/// var jsonObject = JsonNode.FromObject(lookupTable);
///
/// // Read node from JSON object.
/// var playerNode = jsonObject["Player"] as JsonLongNode;
/// Debug.Log(playerNode.Value); // 42
/// ]]></code>
/// <para>Once you have a node representation of your data you can then proceed
/// to output this to a JSON encoded text file:</para>
/// <code language="csharp"><![CDATA[
/// File.WriteAllText(outputPath, jsonObject.ToString());
/// ]]></code>
/// <para>The resulting text file would then look something like this:</para>
/// <code language="json"><![CDATA[
/// {
/// "Player": 42,
/// "Boss1": 72,
/// "Whale": 128
/// }
/// ]]></code>
/// </example>
/// <param name="value">Input value, array, collection, object instance, etc.</param>
/// <returns>
/// The new <see cref="JsonNode"/> instance; or a value of <c>null</c> if input
/// was itself a value of <c>null</c>.
/// </returns>
/// <exception cref="System.Exception">
/// If a problem was encountered whilst attempting to create node representation
/// from input value.
/// </exception>
/// <seealso cref="ConvertTo{T}()"/>
/// <seealso cref="ConvertTo(Type)"/>
public static JsonNode ConvertFrom(object value)
{
if (value == null)
{
return(null);
}
var valueNode = value as JsonNode;
if (valueNode != null)
{
return(valueNode.Clone());
}
var type = value.GetType();
var metaType = MetaType.FromType(type);
switch (metaType.TargetNodeType)
{
case MetaType.NodeType.Integer:
if (Type.GetTypeCode(type) == TypeCode.UInt64)
{
return(new JsonIntegerNode((long)Convert.ToUInt64(value, CultureInfo.InvariantCulture)));
}
else
{
return(new JsonIntegerNode(Convert.ToInt64(value, CultureInfo.InvariantCulture)));
}
case MetaType.NodeType.Double:
return(new JsonDoubleNode(Convert.ToDouble(value, CultureInfo.InvariantCulture)));
case MetaType.NodeType.Boolean:
return(new JsonBooleanNode(Convert.ToBoolean(value, CultureInfo.InvariantCulture)));
case MetaType.NodeType.String:
return(new JsonStringNode(Convert.ToString(value, CultureInfo.InvariantCulture)));
case MetaType.NodeType.Array:
if (type.IsArray)
{
return(JsonArrayNode.FromArray((object[])value));
}
else
{
return(JsonArrayNode.FromCollection((IEnumerable)value));
}
case MetaType.NodeType.Object:
if (metaType.IsDictionaryStyleCollection)
{
return(FromDictionaryStyleCollection((ICollection)value, metaType));
}
else
{
return(JsonObjectNode.FromInstance(value));
}
default:
throw new InvalidOperationException("Was unable to convert input value.");
}
}
