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156 lines (133 loc) · 5.12 KB
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using System;
using System.Runtime.Serialization;
namespace Python.Runtime
{
/// <summary>
/// Represents a generic Python sequence. The methods of this class are
/// equivalent to the Python "abstract sequence API". See
/// PY2: https://docs.python.org/2/c-api/sequence.html
/// PY3: https://docs.python.org/3/c-api/sequence.html
/// for details.
/// </summary>
[Serializable]
public class PySequence : PyIterable
{
internal PySequence(BorrowedReference reference) : base(reference) { }
internal PySequence(in StolenReference reference) : base(reference) { }
protected PySequence(SerializationInfo info, StreamingContext context) : base(info, context) { }
/// <summary>
/// Creates new instance from an existing object.
/// </summary>
/// <exception cref="ArgumentException"><paramref name="o"/> does not provide sequence protocol</exception>
public PySequence(PyObject o) : base(FromObject(o)) { }
static BorrowedReference FromObject(PyObject o)
{
if (o is null) throw new ArgumentNullException(nameof(o));
if (!IsSequenceType(o)) throw new ArgumentException("object is not a sequence");
return o.Reference;
}
/// <summary>
/// Returns <c>true</c> if the given object implements the sequence protocol.
/// </summary>
public static bool IsSequenceType(PyObject value)
{
if (value is null) throw new ArgumentNullException(nameof(value));
return Runtime.PySequence_Check(value.obj);
}
/// <summary>
/// Return the slice of the sequence with the given indices.
/// </summary>
public PyObject GetSlice(int i1, int i2)
{
using var op = Runtime.PySequence_GetSlice(obj, i1, i2);
PythonException.ThrowIfIsNull(op);
return op.MoveToPyObject();
}
/// <summary>
/// Sets the slice of the sequence with the given indices.
/// </summary>
public void SetSlice(int i1, int i2, PyObject v)
{
if (v is null) throw new ArgumentNullException(nameof(v));
int r = Runtime.PySequence_SetSlice(obj, i1, i2, v.obj);
if (r < 0)
{
throw PythonException.ThrowLastAsClrException();
}
}
/// <summary>
/// DelSlice Method
/// </summary>
/// <remarks>
/// Deletes the slice of the sequence with the given indices.
/// </remarks>
public void DelSlice(int i1, int i2)
{
int r = Runtime.PySequence_DelSlice(obj, i1, i2);
if (r < 0)
{
throw PythonException.ThrowLastAsClrException();
}
}
/// <summary>
/// Return the index of the given item in the sequence, or -1 if
/// the item does not appear in the sequence.
/// </summary>
public nint Index(PyObject item)
{
if (item is null) throw new ArgumentNullException(nameof(item));
nint r = Runtime.PySequence_Index(obj, item.obj);
if (r < 0)
{
Runtime.PyErr_Clear();
return -1;
}
return r;
}
/// <summary>
/// Return the index of the given item in the sequence, or -1 if
/// the item does not appear in the sequence.
/// </summary>
public int Index32(PyObject item) => checked((int)Index(item));
/// <summary>
/// Return the index of the given item in the sequence, or -1 if
/// the item does not appear in the sequence.
/// </summary>
public long Index64(PyObject item) => Index(item);
/// <summary>
/// Return true if the sequence contains the given item. This method
/// throws a PythonException if an error occurs during the check.
/// </summary>
public bool Contains(PyObject item)
{
if (item is null) throw new ArgumentNullException(nameof(item));
int r = Runtime.PySequence_Contains(obj, item.obj);
if (r < 0)
{
throw PythonException.ThrowLastAsClrException();
}
return r != 0;
}
/// <summary>
/// Return the concatenation of the sequence object with the passed in
/// sequence object.
/// </summary>
public PyObject Concat(PyObject other)
{
if (other is null) throw new ArgumentNullException(nameof(other));
using var op = Runtime.PySequence_Concat(obj, other.obj);
PythonException.ThrowIfIsNull(op);
return op.MoveToPyObject();
}
/// <summary>
/// Return the sequence object repeated N times. This is equivalent
/// to the Python expression "object * count".
/// </summary>
public PyObject Repeat(int count)
{
using var op = Runtime.PySequence_Repeat(obj, count);
PythonException.ThrowIfIsNull(op);
return op.MoveToPyObject();
}
}
}