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PythonStrIterator.cs
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101 lines (78 loc) · 2.54 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.
#nullable enable
using System.Collections;
using System.Collections.Generic;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using IronPython.Runtime.Types;
using IronPython.Runtime.Operations;
namespace IronPython.Runtime {
// note: any changes in how this iterator works should also be applied in the
// optimized overloads of Builtins.map()
[PythonType("str_iterator")]
public sealed class PythonStrIterator : IEnumerable, IEnumerator<string> {
private readonly string _s;
private int _index;
internal PythonStrIterator(string s) {
Assert.NotNull(s);
_index = -1;
_s = s;
}
public PythonTuple __reduce__(CodeContext context) {
object? iter;
context.TryLookupBuiltin("iter", out iter);
return PythonTuple.MakeTuple(
iter,
PythonTuple.MakeTuple(_s),
_index + 1
);
}
public void __setstate__(int index) {
_index = index - 1;
}
#region IEnumerable Members
[PythonHidden]
public IEnumerator GetEnumerator() {
return this;
}
#endregion
#region IEnumerator<string> Members
[PythonHidden]
public string Current {
get {
if (_index < 0) {
throw PythonOps.SystemError("Enumeration has not started. Call MoveNext.");
} else if (_index >= _s.Length) {
throw PythonOps.SystemError("Enumeration already finished.");
}
return ScriptingRuntimeHelpers.CharToString(_s[_index]);
}
}
#endregion
#region IDisposable Members
[PythonHidden]
public void Dispose() { }
#endregion
#region IEnumerator Members
object IEnumerator.Current {
get {
return ((IEnumerator<string>)this).Current;
}
}
[PythonHidden]
public bool MoveNext() {
if (_index >= _s.Length) {
return false;
}
_index++;
return _index != _s.Length;
}
[PythonHidden]
public void Reset() {
_index = -1;
}
#endregion
}
}