public static Map Parse(string filename)
{
Debug.Assert(filename != null);
var doc = new XmlDocument();
doc.Load(filename);
var root = doc.DocumentElement;
Debug.Assert(root != null);
if (root.Name != ElementMap)
{
throw new Exception(Resources.InvalidMapFileError);
}
var version = root.GetAttribute(AttrVersion);
if (version != SupportedVersion)
{
throw new Exception(Resources.UnsupportedVersionError);
}
var name = root.GetAttribute(AttrName);
var floors = new List <Floor>();
var floorElements = root.SelectNodes(ElementFloor)?.OfType <XmlElement>();
if (floorElements == null)
{
return(new Map(name, floors));
}
foreach (var floorElement in floorElements)
{
var floor = new Floor();
var entryNodeElements = floorElement.SelectNodes($"Node[@{AttrType}='{NodeType.GuideNode}']")?.OfType <XmlElement>();
Debug.Assert(entryNodeElements != null);
floor.AddNodes(entryNodeElements.Select(GenerateNode));
var wallNodeElements = floorElement.SelectNodes($"Node[@{AttrType}='{NodeType.WallNode}']")?.OfType <XmlElement>();
Debug.Assert(wallNodeElements != null);
floor.AddNodes(wallNodeElements.Select(GenerateNode));
var linkElements = floorElement.SelectNodes(ElementLink)?.OfType <XmlElement>();
Debug.Assert(linkElements != null);
floor.AddLinks(linkElements.Select(GenerateLink));
floors.Add(floor);
}
return(new Map(name, floors));
}