public static DialogueNode Read(ref Utf8JsonReader reader)
{
/*
*
* This first if block is checking to see if the reader has yet to read anything. This method can be called recursively
* for nested json structures. Its called recursively with the reference to the same reader - a new one is not creates.
* If the reader is already in the middle of the json structure, this block won't execute.
* This really just "initializes" the reader to point to the first Token in the json structure rather than nothing.
*
*/
if (reader.TokenType == JsonTokenType.None)
{
reader.Read();
}
if (reader.TokenType != JsonTokenType.StartObject)
{
throw new JsonException();
}
reader.Read();
if (reader.TokenType != JsonTokenType.PropertyName)
{
throw new JsonException();
}
string propertyForType = reader.GetString();
if (propertyForType != "Type")
{
throw new JsonException();
}
reader.Read();
if (reader.TokenType != JsonTokenType.Number)
{
throw new JsonException();
}
TypeDiscriminator typeDiscriminator = (TypeDiscriminator)reader.GetInt32();
DialogueNode dialogueNode = typeDiscriminator switch
{
TypeDiscriminator.DialogueLine => new DialogueLine(),
TypeDiscriminator.DialoguePrompt => new DialoguePrompt(),
_ => throw new JsonException()
};
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.EndObject)
{
return(dialogueNode);
}
if (reader.TokenType == JsonTokenType.PropertyName)
{
string propertyName = reader.GetString();
reader.Read();
switch (propertyName)
{
case "SpeakerName":
string speakerName = reader.GetString();
dialogueNode.SpeakerName = speakerName;
break;
case "Emotion":
string emotion = reader.GetString();
dialogueNode.Emotion = emotion;
break;
case "Text":
string text = reader.GetString();
dialogueNode.Text = text;
break;
case "NextDialogueNode":
((DialogueLine)dialogueNode).NextDialogueNode = Read(ref reader);
break;
case "DialogueOptions":
if (reader.TokenType != JsonTokenType.StartArray)
{
throw new JsonException();
}
((DialoguePrompt)dialogueNode).Options = new List <DialogueOption>();
reader.Read();
while (reader.TokenType != JsonTokenType.EndArray)
{
if (reader.TokenType != JsonTokenType.StartObject)
{
throw new JsonException();
}
var dialogueOption = new DialogueOption();
while (reader.TokenType != JsonTokenType.EndObject)
{
reader.Read();
if (reader.TokenType != JsonTokenType.PropertyName)
{
throw new JsonException();
}
string dialogueOptionPropertyName = reader.GetString();
reader.Read();
switch (dialogueOptionPropertyName)
{
case "Text":
dialogueOption.Text = reader.GetString();
break;
case "ResponseDialogueNode":
dialogueOption.ResponseDialogueNode = Read(ref reader);
break;
}
}
reader.Read();
reader.Read();
((DialoguePrompt)dialogueNode).Options.Add(dialogueOption);
}
break;
}
}
}
throw new JsonException();
}
}