private static void SelectImpl(Variant input, string path, Variant result)
{
string head = "", tail = "";
Match myMatch = Regex.Match(path, @"[^/]+");
if (myMatch.Success)
{
head = myMatch.Value;
tail = path.Substring(myMatch.Index + myMatch.Length);
}
else
{
result.Add(input);
return;
}
string node = "", pred_key = "", pred_val = "";
myMatch = Regex.Match(head, @"^(\*|\w+)(\[@?(\w+)=""?(\w+)""?\])?");
if (myMatch.Success)
{
node = myMatch.Groups[1].Value;
pred_key = myMatch.Groups[3].Value;
pred_val = myMatch.Groups[4].Value;
}
else
{
throw new VariantException("Select path has invalid syntax: " + head);
}
Variant nodes = new Variant(EnumType.List);
if (node.Length == 0 || node == "*")
{
foreach (VariantItem item in input)
{
nodes.Add(item.Value);
}
}
else if (input.Is(EnumType.Mapping))
{
foreach (VariantItem item in input.Range(node))
{
nodes.Add(item.Value);
}
}
foreach (VariantItem item in nodes)
{
if (pred_key.Length == 0 || (item.Value.Is(EnumType.Mapping) && item.Value.ContainsKey(pred_key) && item.Value[pred_key].AnyCast().As <string>() == pred_val))
{
SelectImpl(item.Value, tail, result);
}
}
}