internal static Array GetSlice(Array data, int size, Slice slice)
{
if (data.Rank != 1)
{
throw PythonOps.NotImplementedError("slice on multi-dimensional array");
}
int start, stop, step;
slice.indices(size, out start, out stop, out step);
if ((step > 0 && start >= stop) || (step < 0 && start <= stop))
{
if (data.GetType().GetElementType() == typeof(object))
{
return(ArrayUtils.EmptyObjects);
}
return(Array.CreateInstance(data.GetType().GetElementType(), 0));
}
if (step == 1)
{
int n = stop - start;
Array ret = Array.CreateInstance(data.GetType().GetElementType(), n);
Array.Copy(data, start + data.GetLowerBound(0), ret, 0, n);
return(ret);
}
else
{
int n = PythonOps.GetSliceCount(start, stop, step);
Array ret = Array.CreateInstance(data.GetType().GetElementType(), n);
int ri = 0;
for (int i = 0, index = start; i < n; i++, index += step)
{
ret.SetValue(data.GetValue(index + data.GetLowerBound(0)), ri++);
}
return(ret);
}
}
internal static object[] GetSlice(object[] data, int start, int stop, int step)
{
Debug.Assert(step != 0);
if (step == 1)
{
return(GetSlice(data, start, stop));
}
int size = PythonOps.GetSliceCount(start, stop, step);
if (size <= 0)
{
return(ArrayUtils.EmptyObjects);
}
object[] res = new object[size];
for (int i = 0, index = start; i < res.Length; i++, index += step)
{
res[i] = data[index];
}
return(res);
}