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using System;
namespace Python.Runtime
{
/// <summary>
/// Represents a Python tuple object. See the documentation at
/// PY2: https://docs.python.org/2/c-api/tupleObjects.html
/// PY3: https://docs.python.org/3/c-api/tupleObjects.html
/// for details.
/// </summary>
public class PyTuple : PySequence
{
/// <summary>
/// PyTuple Constructor
/// </summary>
/// <remarks>
/// Creates a new PyTuple from an existing object reference. Note
/// that the instance assumes ownership of the object reference.
/// The object reference is not checked for type-correctness.
/// </remarks>
public PyTuple(IntPtr ptr) : base(ptr)
{
}
/// <summary>
/// PyTuple Constructor
/// </summary>
/// <remarks>
/// Copy constructor - obtain a PyTuple from a generic PyObject. An
/// ArgumentException will be thrown if the given object is not a
/// Python tuple object.
/// </remarks>
public PyTuple(PyObject o)
{
if (!IsTupleType(o))
{
throw new ArgumentException("object is not a tuple");
}
Runtime.XIncref(o.obj);
obj = o.obj;
}
/// <summary>
/// PyTuple Constructor
/// </summary>
/// <remarks>
/// Creates a new empty PyTuple.
/// </remarks>
public PyTuple()
{
obj = Runtime.PyTuple_New(0);
Runtime.CheckExceptionOccurred();
}
/// <summary>
/// PyTuple Constructor
/// </summary>
/// <remarks>
/// Creates a new PyTuple from an array of PyObject instances.
/// <para />
/// See caveats about PyTuple_SetItem:
/// https://www.coursehero.com/file/p4j2ogg/important-exceptions-to-this-rule-PyTupleSetItem-and-PyListSetItem-These/
/// </remarks>
public PyTuple(PyObject[] items)
{
int count = items.Length;
obj = Runtime.PyTuple_New(count);
for (var i = 0; i < count; i++)
{
IntPtr ptr = items[i].obj;
Runtime.XIncref(ptr);
Runtime.PyTuple_SetItem(obj, i, ptr);
Runtime.CheckExceptionOccurred();
}
}
/// <summary>
/// IsTupleType Method
/// </summary>
/// <remarks>
/// Returns true if the given object is a Python tuple.
/// </remarks>
public static bool IsTupleType(PyObject value)
{
return Runtime.PyTuple_Check(value.obj);
}
/// <summary>
/// AsTuple Method
/// </summary>
/// <remarks>
/// Convert a Python object to a Python tuple if possible, raising
/// a PythonException if the conversion is not possible. This is
/// equivalent to the Python expression "tuple(object)".
/// </remarks>
public static PyTuple AsTuple(PyObject value)
{
IntPtr op = Runtime.PySequence_Tuple(value.obj);
Runtime.CheckExceptionOccurred();
return new PyTuple(op);
}
}
}