/// <summary>
/// Attempt to create object node from a .NET object.
/// </summary>
/// <param name="instance">Input object.</param>
/// <returns>
/// The new <see cref="JsonObjectNode"/> instance; otherwise a value of <c>null</c>
/// if input was <c>null</c>.
/// </returns>
/// <exception cref="System.Exception">
/// If error is encountered whilst creating object node. Errors are likely to
/// occur when unable to convert property values into JSON nodes.
/// </exception>
internal static JsonObjectNode FromInstance(object instance)
{
if (instance == null)
{
return(null);
}
var node = new JsonObjectNode();
var metaType = MetaType.FromType(instance.GetType());
metaType.InvokeOnSerializing(instance, default(StreamingContext));
foreach (var member in metaType.SerializableMembers)
{
object value;
if (member.Info.MemberType == MemberTypes.Field)
{
var mi = (FieldInfo)member.Info;
value = mi.GetValue(instance);
}
else
{
var pi = (PropertyInfo)member.Info;
value = pi.GetValue(instance, null);
}
node[member.ResolvedName] = ConvertFrom(value);
}
metaType.InvokeOnSerialized(instance, default(StreamingContext));
return(node);
}
/// <inheritdoc/>
public override JsonNode Clone()
{
var node = new JsonObjectNode();
foreach (var property in this.properties)
{
node[property.Key] = property.Value != null
? property.Value.Clone()
: null;
}
return(node);
}
private static JsonObjectNode FromDictionaryStyleCollection(ICollection collection, MetaType metaType)
{
var node = new JsonObjectNode();
if (collection.Count > 0)
{
foreach (var pair in collection)
{
string key = (string)metaType.KeyPropertyInfo.GetValue(pair, null);
node[key] = ConvertFrom(metaType.ValuePropertyInfo.GetValue(pair, null));
}
}
return(node);
}
/// <summary>
/// Reads a JSON object which comprises of zero-or-more named properties.
/// </summary>
/// <returns>
/// The new <see cref="JsonNode"/> instance.
/// </returns>
/// <exception cref="JsonParserException">
/// If a syntax error was encountered whilst attempting to parse input content.
/// Exception contains identifies the source of the error by providing the line
/// number and position.
/// </exception>
private JsonNode ReadObject()
{
this.Accept();
this.SkipWhitespace();
var node = new JsonObjectNode();
while (!this.HasReachedEnd)
{
if (this.Peek() == '}')
{
this.Accept();
return(node);
}
else if (this.Peek() == ',' && node.Count != 0)
{
this.Accept();
this.SkipWhitespace();
if (this.HasReachedEnd)
{
break;
}
}
string key = this.ReadStringLiteral("Key");
this.SkipWhitespace();
if (this.HasReachedEnd)
{
break;
}
if (this.Peek() != ':')
{
throw new JsonParserException("Found '" + this.Peek() + "' but expected ':'", this.lineNumber, this.linePosition);
}
this.Accept();
this.SkipWhitespace();
if (this.HasReachedEnd)
{
break;
}
node[key] = this.ReadValue();
this.SkipWhitespace();
}
throw new JsonParserException("Expected '}' but reached end of input.", this.lineNumber, this.linePosition);
}
/// <summary>
/// Create object node from a generic dictionary.
/// </summary>
/// <remarks>
/// <para>Property values are cloned if they are already <see cref="JsonNode"/>
/// instances.</para>
/// </remarks>
/// <typeparam name="TValue">Type of property value.</typeparam>
/// <param name="dictionary">Input dictionary.</param>
/// <returns>
/// The new <see cref="JsonObjectNode"/> instance.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// If <paramref name="dictionary"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.Exception">
/// If error is encountered whilst creating object node. Errors are likely to
/// occur when unable to convert property values into JSON nodes.
/// </exception>
public static JsonObjectNode FromDictionary <TValue>(IDictionary <string, TValue> dictionary)
{
if (dictionary == null)
{
throw new ArgumentNullException("dictionary");
}
var node = new JsonObjectNode();
foreach (var property in dictionary)
{
node[property.Key] = ConvertFrom(property.Value);
}
return(node);
}
/// <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.");
}
}
