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using System;
using System.Collections.Generic;
namespace Python.Runtime
{
/// <summary>
/// Represents a standard Python iterator object. See the documentation at
/// PY2: https://docs.python.org/2/c-api/iterator.html
/// PY3: https://docs.python.org/3/c-api/iterator.html
/// for details.
/// </summary>
public class PyIter : PyObject, IEnumerator<PyObject>
{
private PyObject _current;
/// <summary>
/// PyIter Constructor
/// </summary>
/// <remarks>
/// Creates a new PyIter from an existing iterator reference. Note
/// that the instance assumes ownership of the object reference.
/// The object reference is not checked for type-correctness.
/// </remarks>
public PyIter(IntPtr ptr) : base(ptr)
{
}
/// <summary>
/// PyIter factory function.
/// </summary>
/// <remarks>
/// Create a new PyIter from a given iterable. Like doing "iter(iterable)" in python.
/// </remarks>
/// <param name="iterable"></param>
/// <returns></returns>
public static PyIter GetIter(PyObject iterable)
{
if (iterable == null)
{
throw new ArgumentNullException();
}
IntPtr val = Runtime.PyObject_GetIter(iterable.obj);
PythonException.ThrowIfIsNull(val);
return new PyIter(val);
}
protected override void Dispose(bool disposing)
{
_current = null;
base.Dispose(disposing);
}
public bool MoveNext()
{
NewReference next = Runtime.PyIter_Next(Reference);
if (next.IsNull())
{
if (Exceptions.ErrorOccurred())
{
throw new PythonException();
}
// stop holding the previous object, if there was one
_current = null;
return false;
}
_current = next.MoveToPyObject();
return true;
}
public void Reset()
{
throw new NotSupportedException();
}
public PyObject Current => _current;
object System.Collections.IEnumerator.Current => _current;
}
}