private static ParsingNode ParseTree(ByteArrayReadStream stream)
{
// Skipping the first 4 bytes coz they are used to store a... identifier?
stream.Skip(IdentifierLength);
var firstMarker = (MarkupByte)stream.ReadByte();
if (firstMarker != MarkupByte.Start)
{
throw new MalformedWorldException();
}
var guessedMaximumNodeDepth = 128;
var nodeStack = new Stack <ParsingNode>(capacity: guessedMaximumNodeDepth);
var rootNodeType = (byte)stream.ReadByte();
var rootNode = new ParsingNode()
{
Type = (NodeType)rootNodeType,
DataBegin = (int)stream.Position
};
nodeStack.Push(rootNode);
ParseTreeAfterRootNodeStart(stream, nodeStack);
if (nodeStack.Count != 0)
{
throw new MalformedWorldException();
}
return(rootNode);
}
public byte ReadByte()
{
var value = UnderlayingStream.ReadByte();
if ((MarkupByte)value != MarkupByte.Escape)
{
return(value);
}
else
{
return(UnderlayingStream.ReadByte());
}
}
private static void ProcessNodeStart(ByteArrayReadStream stream, Stack <ParsingNode> nodeStack)
{
if (!nodeStack.TryPeek(out var currentNode))
{
throw new MalformedWorldException();
}
if (currentNode.Children.Count == 0)
{
currentNode.DataEnd = stream.Position;
}
var childType = stream.ReadByte();
if (stream.IsOver)
{
throw new MalformedWorldException();
}
var child = new ParsingNode {
Type = (NodeType)childType,
DataBegin = stream.Position// + sizeof(MarkupByte)
};
currentNode.Children.Add(child);
nodeStack.Push(child);
}
private static void ParseTreeAfterRootNodeStart(
ByteArrayReadStream stream,
Stack <ParsingNode> nodeStack
)
{
while (!stream.IsOver)
{
var currentMark = (MarkupByte)stream.ReadByte();
switch (currentMark)
{
case MarkupByte.Start:
ProcessNodeStart(stream, nodeStack);
break;
case MarkupByte.End:
ProcessNodeEnd(stream, nodeStack);
break;
case MarkupByte.Escape:
ProcessNodeEscape(stream);
break;
default:
/// If it's not a <see cref="ParsingWorldNode.NodeMarker"/>, then it's just prop data
/// and we can safely skip it.
break;
}
}
}
private static void ProcessNodeEscape(ByteArrayReadStream stream)
{
var escapedByte = stream.ReadByte();
if (stream.IsOver)
{
throw new MalformedWorldException();
}
}
