/// <summary>
/// tuple ==> "{}" | "{" result ( "," result )* "}"
/// </summary>
/// <returns>if one tuple found a TupleValue, otherwise a ValueListValue of TupleValues</returns>
private static ResultValue ParseResultTuple(string input, out string rest)
{
var list = ParseResultList('{', '}', input, out rest);
if (list == null)
{
return(null);
}
var tlist = new List <ResultValue>();
TupleValue v;
while (rest.StartsWith(",{", StringComparison.Ordinal))
{
// a tuple list
v = new TupleValue(list);
tlist.Add(v);
list = ParseResultList('{', '}', rest.Substring(1), out rest);
}
v = new TupleValue(list);
if (tlist.Count != 0)
{
tlist.Add(v);
return(new ValueListValue(tlist));
}
return(v);
}
/// <summary>
/// tuple ==> "{}" | "{" result ( "," result )* "}"
/// </summary>
/// <returns>if one tuple found a TupleValue, otherwise a ValueListValue of TupleValues</returns>
private ResultValue ParseResultTuple(Span input, out Span rest)
{
var list = ParseResultList('{', '}', input, out rest);
if (list == null)
{
return(null);
}
var tlist = new List <ResultValue>();
TupleValue v;
while (rest.StartsWith(_resultString, ",{"))
{
// a tuple list
v = new TupleValue(list);
tlist.Add(v);
list = ParseResultList('{', '}', rest.Advance(1), out rest);
}
v = new TupleValue(list);
if (tlist.Count != 0)
{
tlist.Add(v);
return(new ValueListValue(tlist));
}
return(v);
}