Block ResolveType(String selector, out bool isGroup)
{
var tokens = PROGRAM.ParseTokens(selector);
var parameters = PROGRAM.ParseCommandParameters(tokens);
var blockType = findLast <BlockTypeCommandParameter>(parameters);
isGroup = findLast <GroupCommandParameter>(parameters) != null;
if (blockType == null)
{
throw new Exception("Cannot parse block type from selector: " + selector);
}
return(blockType.value);
}