private static string GetHeadToken(string src, out bool success)
{
string s = src[0].ToString();
if (s == QiSignatures.TypeDynamic || EmbeddedTypeQiSignatures.Contains(s))
{
success = true;
return s;
}
if (s == QiSignatures.TypeListBegin)
{
int index = GetContainerTokenEndIndex(src, QiSignatures.TypeListBegin, QiSignatures.TypeListEnd, out success);
if (index > 0)
{
return src.Substring(0, index + 1);
}
}
if (s == QiSignatures.TypeMapBegin)
{
int index = GetContainerTokenEndIndex(src, QiSignatures.TypeMapBegin, QiSignatures.TypeMapEnd, out success);
if (index > 0)
{
return src.Substring(0, index + 1);
}
}
if (s == QiSignatures.TypeTupleBegin)
{
int index = GetContainerTokenEndIndex(src, QiSignatures.TypeTupleBegin, QiSignatures.TypeTupleEnd, out success);
if (index > 0)
{
return src.Substring(0, index + 1);
}
}
throw new InvalidOperationException($"could not found signature token properly: {src}");
}
