private static IEnumerable <TomlObject> ProcessIdentifier(TomlObject obj, ReadOnlyMemory <char> pathM)
{
if (pathM.IsEmpty)
{
return(Enumerable.Empty <TomlObject>());
}
var path = pathM.Span;
switch (path[0])
{
case '*':
{
var rest = pathM.Slice(1);
if (rest.IsEmpty)
{
return(obj.GetAllSubItems());
}
if (IsArray(rest.Span))
{
return(obj.GetAllSubItems().SelectMany(x => ProcessArray(x, rest)));
}
else if (IsDot(rest.Span))
{
return(obj.GetAllSubItems().SelectMany(x => ProcessDot(x, rest)));
}
else
{
throw new ArgumentException("Invalid expression after wildcard", nameof(pathM));
}
}
case '[':
throw new ArgumentException("Invalid array open bracket", nameof(pathM));
case ']':
throw new ArgumentException("Invalid array close bracket", nameof(pathM));
case '.':
throw new ArgumentException("Invalid dot", nameof(pathM));
default:
{
var subItemName = path;
var rest = ReadOnlyMemory <char> .Empty;
bool cont = false;
for (int i = 0; i < path.Length; i++)
{
// todo allow in future
if (path[i] == '*')
{
throw new ArgumentException("Invalid wildcard position", nameof(pathM));
}
var currentSub = path.Slice(i);
if (!IsIdentifier(currentSub)) // if (!IsName)
{
cont = true;
subItemName = path.Slice(0, i);
rest = pathM.Slice(i);
break;
}
}
var item = obj.GetSubItemByName(subItemName);
if (item is null)
{
return(Enumerable.Empty <TomlObject>());
}
if (cont)
{
if (IsArray(rest.Span))
{
return(ProcessArray(item, rest));
}
else if (IsDot(rest.Span))
{
return(ProcessDot(item, rest));
}
else
{
throw new ArgumentException("Invalid expression name identifier", nameof(pathM));
}
}
return(new[] { item });
}
}
}
