/// <summary>
/// Read a tile element. In this case, a tile element is any of "<Tile>",
/// "<Outputter>", or "<Receiver>", where the string "type" parameter
/// determines which of the three it is.
/// </summary>
private TileInfo ReadTileElement(XmlElement tile)
{
var tileName = tile.GetAttribute(TYPE_ATTRIBUTE);
TileType tileType;
var success = Enum.TryParse<TileType>(tileName, out tileType);
if (!success)
{
Error_InvalidAttributeValue("tile type", tile.GetAttribute(TYPE_ATTRIBUTE));
}
// All non-empty tiles initially specified in the level file are closed to
// prevent the player overwriting them.
var tileInfo = new TileInfo(tileType, false);
foreach (var attr in tile.Attributes.Cast<XmlAttribute>())
{
switch(attr.Name)
{
case DIRECTION_ATTRIBUTE:
if (!Directions.DirectionsByName.ContainsKey(attr.InnerText))
Error_InvalidAttributeValue("direction", attr.InnerText);
var direction = Directions.DirectionsByName[attr.InnerText];
tileInfo.SetAttr<Directions>(attr.Name, direction);
break;
case COLOUR_ATTRIBUTE:
if (!LaserColours.ColoursByName.ContainsKey(attr.InnerText))
Error_InvalidAttributeValue("colour", attr.InnerText);
var colour = LaserColours.ColoursByName[attr.InnerText];
tileInfo.SetAttr<LaserColours>(attr.Name, colour);
break;
default:
break;
}
}
// Check to ensure a tile of a specific type has the required
// attributes.
switch (tileType)
{
case TileType.Outputter:
case TileType.Receiver:
if (!tileInfo.HasAttr<LaserColours>(COLOUR_ATTRIBUTE) ||
!tileInfo.HasAttr<Directions>(DIRECTION_ATTRIBUTE))
Error_NoColourOrDirectionAttribute(tileName.ToLower());
break;
case TileType.OpenReceiver:
case TileType.OpenReceiver_pass_L:
case TileType.OpenReceiver_pass_U:
case TileType.OpenReceiver_pass_UL:
case TileType.OpenReceiver_pass_UR:
if (!tileInfo.HasAttr<LaserColours>(COLOUR_ATTRIBUTE))
Error_NoColourOrDirectionAttribute(tileName.ToLower());
break;
default:
break;
}
return tileInfo;
}
