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Copy pathArray.cs
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189 lines (160 loc) · 7.07 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.
#if FEATURE_CTYPES
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System.Text;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
namespace IronPython.Modules {
/// <summary>
/// Provides support for interop with native code from Python code.
/// </summary>
public static partial class CTypes {
[PythonType("Array")]
public abstract class _Array : CData {
public void __init__([NotNone] params object[] args) {
INativeType nativeType = NativeType;
MemHolder = new MemoryHolder(nativeType.Size);
if (args.Length > ((ArrayType)nativeType).Length) {
throw PythonOps.IndexError("too many arguments");
}
INativeType elementType = ElementType;
for (var i = 0; i < args.Length; i++) {
elementType.SetValue(MemHolder, checked(i * elementType.Size), args[i]);
}
}
public object this[int index] {
get {
index = PythonOps.FixIndex(index, ((ArrayType)NativeType).Length);
INativeType elementType = ElementType;
return elementType.GetValue(
MemHolder,
this,
checked(index * elementType.Size),
false
);
}
set {
index = PythonOps.FixIndex(index, ((ArrayType)NativeType).Length);
INativeType elementType = ElementType;
object keepAlive = elementType.SetValue(
MemHolder,
checked(index * elementType.Size),
value
);
if (keepAlive != null) {
MemHolder.AddObject(index.ToString(), keepAlive);
}
}
}
public object this[[NotNone] Slice slice] {
get {
int start, stop, step, count;
int size = ((ArrayType)NativeType).Length;
SimpleType elemType = ((ArrayType)NativeType).ElementType as SimpleType;
slice.GetIndicesAndCount(size, out start, out stop, out step, out count);
if ((step > 0 && start >= stop) || (step < 0 && start <= stop)) {
if (elemType != null) {
if (elemType._type == SimpleTypeKind.Char) return Bytes.Empty;
if (elemType._type == SimpleTypeKind.WChar) return string.Empty;
}
return new PythonList();
}
if (elemType != null) {
if (elemType._type == SimpleTypeKind.Char) {
Debug.Assert(((INativeType)elemType).Size == 1);
if (step == 1) {
return MemHolder.ReadBytes(start, count);
} else {
var buffer = new byte[count];
for (int i = 0, index = start; i < count; i++, index += step) {
buffer[i] = MemHolder.ReadByte(index);
}
return Bytes.Make(buffer);
}
}
if (elemType._type == SimpleTypeKind.WChar) {
int elmSize = ((INativeType)elemType).Size;
if (step == 1) {
return MemHolder.ReadUnicodeString(checked(start * elmSize), count);
} else {
var res = new StringBuilder(count);
for (int i = 0, index = start; i < count; i++, index += step) {
res.Append((char)MemHolder.ReadInt16(checked(index * elmSize)));
}
return res.ToString();
}
}
}
object[] ret = new object[count];
for (int i = 0, index = start; i < count; i++, index += step) {
ret[i] = this[index];
}
return PythonList.FromArrayNoCopy(ret);
}
set {
int start, stop, step, count;
int size = ((ArrayType)NativeType).Length;
slice.GetIndicesAndCount(size, out start, out stop, out step, out count);
IEnumerator ie = PythonOps.GetEnumerator(value);
for (int i = 0, index = start; i < count; i++, index += step) {
if (!ie.MoveNext()) {
throw PythonOps.ValueError("sequence not long enough");
}
this[index] = ie.Current;
}
if (ie.MoveNext()) {
throw PythonOps.ValueError("not all values consumed while slicing");
}
}
}
public int __len__() {
return ((ArrayType)NativeType).Length;
}
private INativeType ElementType {
get {
return ((ArrayType)NativeType).ElementType;
}
}
internal override PythonTuple GetBufferInfo() {
var shape = Shape;
return PythonTuple.MakeTuple(
NativeType.TypeFormat,
shape.Count,
PythonTuple.Make(shape)
);
}
#region IBufferProtocol
[PythonHidden]
public override int ItemSize {
get {
var curType = NativeType;
while (curType is ArrayType arrayType) {
curType = arrayType.ElementType;
}
return curType.Size;
}
}
[PythonHidden]
public override IReadOnlyList<int> Shape {
get {
List<int> shape = new List<int>();
var curType = NativeType;
while (curType is ArrayType arrayType) {
shape.Add(arrayType.Length);
curType = arrayType.ElementType;
}
return shape;
}
}
// TODO: if this.NativeType.ElementType is ArrayType, suboffsets need to be reported
#endregion
}
}
}
#endif