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Copy pathMemoryView.cs
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284 lines (231 loc) · 8.73 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System;
using System.Numerics;
using IronPython.Runtime.Operations;
using Microsoft.Scripting.Runtime;
namespace IronPython.Runtime {
[PythonType("memoryview")]
public sealed class MemoryView : ICodeFormattable {
private readonly IBufferProtocol _buffer;
private readonly int _start;
private readonly int? _end;
public MemoryView(IBufferProtocol obj) {
_buffer = obj;
}
private MemoryView(IBufferProtocol obj, int start, int? end) : this(obj) {
_start = start;
_end = end;
}
public MemoryView(MemoryView obj) {
_buffer = obj._buffer;
_start = obj._start;
_end = obj._end;
}
public MemoryView(PythonBuffer obj) {
_buffer = new IListOfBytesBufferProtocol(obj);
}
public MemoryView(string obj) {
_buffer = new StringBufferProtocol(obj);
}
public int __len__() {
if (_end != null) {
return _end.Value - _start;
}
return _buffer.ItemCount;
}
public string format {
get { return _buffer.Format; }
}
public BigInteger itemsize {
get { return _buffer.ItemSize; }
}
public BigInteger ndim {
get { return _buffer.NumberDimensions; }
}
public bool @readonly {
get { return _buffer.ReadOnly; }
}
public PythonTuple shape {
get {
var shape = _buffer.GetShape(_start, _end);
if (shape == null) {
return null;
}
return new PythonTuple(shape);
}
}
public PythonTuple strides {
get { return _buffer.Strides; }
}
public object suboffsets {
get { return _buffer.SubOffsets; }
}
public Bytes tobytes() {
return _buffer.ToBytes(_start, _end);
}
public List tolist() {
return _buffer.ToList(_start, _end);
}
public object this[int index] {
get {
index = PythonOps.FixIndex(index, __len__());
return _buffer.GetItem(index + _start);
}
set {
if (_buffer.ReadOnly) {
throw PythonOps.TypeError("cannot modify read-only memory");
}
index = PythonOps.FixIndex(index, __len__());
_buffer.SetItem(index + _start, value);
}
}
public void __delitem__(int index) {
if (_buffer.ReadOnly) {
throw PythonOps.TypeError("cannot modify read-only memory");
}
throw PythonOps.TypeError("cannot delete memory");
}
public void __delitem__([NotNull]Slice slice) {
if (_buffer.ReadOnly) {
throw PythonOps.TypeError("cannot modify read-only memory");
}
throw PythonOps.TypeError("cannot delete memory");
}
public object this[[NotNull]Slice slice] {
get {
int start, stop;
FixSlice(slice, __len__(), out start, out stop);
return new MemoryView(_buffer, _start + start, _start + stop);
}
set {
if (_buffer.ReadOnly) {
throw PythonOps.TypeError("cannot modify read-only memory");
}
int start, stop;
FixSlice(slice, __len__(), out start, out stop);
int newLen = PythonOps.Length(value);
if (stop - start != newLen) {
throw PythonOps.ValueError("cannot resize memory view");
}
_buffer.SetSlice(new Slice(_start + start, _start + stop), value);
}
}
/// <summary>
/// MemoryView slicing is somewhat different and more restricted than
/// standard slicing.
/// </summary>
public static void FixSlice(Slice slice, int len, out int start, out int stop) {
if (slice.step != null) {
throw PythonOps.NotImplementedError("");
}
int step;
slice.indices(len, out start, out stop, out step);
if (stop < start) {
// backwards iteration is interpreted as empty slice
stop = start;
}
}
public static bool operator >(MemoryView self, IBufferProtocol other) {
return self > new MemoryView(other);
}
public static bool operator >(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) > other;
}
public static bool operator >(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other != null;
} else if ((object)other == null) {
return true;
}
return self.tobytes() > other.tobytes();
}
public static bool operator <(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other == null;
} else if ((object)other == null) {
return false;
}
return self.tobytes() < other.tobytes();
}
public static bool operator <(MemoryView self, IBufferProtocol other) {
return self < new MemoryView(other);
}
public static bool operator <(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) < other;
}
public static bool operator >=(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other == null;
} else if ((object)other == null) {
return false;
}
return self.tobytes() >= other.tobytes();
}
public static bool operator >=(MemoryView self, IBufferProtocol other) {
return self >= new MemoryView(other);
}
public static bool operator >=(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) >= other;
}
public static bool operator <=(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other != null;
} else if ((object)other == null) {
return true;
}
return self.tobytes() <= other.tobytes();
}
public static bool operator <=(MemoryView self, IBufferProtocol other) {
return self <= new MemoryView(other);
}
public static bool operator <=(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) <= other;
}
public static bool operator ==(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other == null;
} else if ((object)other == null) {
return false;
}
return self.tobytes().Equals(other.tobytes());
}
public static bool operator ==(MemoryView self, IBufferProtocol other) {
return self == new MemoryView(other);
}
public static bool operator ==(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) == other;
}
public static bool operator !=(MemoryView self, MemoryView other) {
if ((object)self == null) {
return (object)other != null;
} else if ((object)other == null) {
return true;
}
return !self.tobytes().Equals(other.tobytes());
}
public static bool operator !=(MemoryView self, IBufferProtocol other) {
return self != new MemoryView(other);
}
public static bool operator !=(IBufferProtocol self, MemoryView other) {
return new MemoryView(self) != other;
}
public const object __hash__ = null;
public override bool Equals(object obj) {
MemoryView mv = obj as MemoryView;
if ((object)mv != null) {
return this == mv;
}
return false;
}
public override int GetHashCode() {
return base.GetHashCode();
}
#region ICodeFormattable Members
public string __repr__(CodeContext context) {
return String.Format("<memory at {0}>", PythonOps.Id(this));
}
#endregion
}
}