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StringTokenizer.cs
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StringTokenizer.cs
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// Copyright 2020 Heath Stewart.
// Licensed under the MIT License. See LICENSE.txt in the project root for license information.
// Derived from https://github.com/dotnet/extensions/blob/master/src/Primitives/src/StringTokenizer.cs
// licensed under the Apache License, version 2.0. See ThirdPartyNotices.txt in the project root for license information.
using System;
using System.Collections;
using System.Collections.Generic;
internal readonly struct StringTokenizer : IEnumerable<StringSegment>
{
private readonly StringSegment _value;
private readonly char[] _separators;
private readonly StringSplitOptions _options;
public StringTokenizer(string value, char[] separators, StringSplitOptions options = default)
{
_value = value ?? throw new ArgumentNullException(nameof(value));
_separators = separators ?? throw new ArgumentNullException(nameof(separators));
_options = options;
}
public StringTokenizer(StringSegment value, char[] separators, StringSplitOptions options = default)
{
if (!value.HasValue)
{
throw new ArgumentNullException(nameof(value));
}
_value = value;
_separators = separators ?? throw new ArgumentNullException(nameof(separators));
_options = options;
}
public Enumerator GetEnumerator() => new Enumerator(in _value, _separators, _options);
IEnumerator<StringSegment> IEnumerable<StringSegment>.GetEnumerator() => GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
public struct Enumerator : IEnumerator<StringSegment>
{
private readonly StringSegment _value;
private readonly char[] _separators;
private readonly StringSplitOptions _options;
private int _index;
public Enumerator(ref StringTokenizer tokenizer)
{
_value = tokenizer._value;
_separators = tokenizer._separators;
_options = tokenizer._options;
Current = default;
_index = 0;
}
internal Enumerator(in StringSegment value, char[] separators, StringSplitOptions options)
{
_value = value;
_separators = separators;
_options = options;
Current = default;
_index = 0;
}
public StringSegment Current { get; private set; }
object IEnumerator.Current => Current;
public void Dispose()
{
}
public bool MoveNext()
{
if (!_value.HasValue || _index > _value.Length)
{
Current = default;
return false;
}
if ((_options & StringSplitOptions.RemoveEmptyEntries) == StringSplitOptions.RemoveEmptyEntries)
{
_value.Skip(ref _index, _separators);
if (_index == _value.Length)
{
return false;
}
}
int next = _value.IndexOfAny(_separators, _index);
if (next == -1)
{
next = _value.Length;
}
Current = _value.Subsegment(_index, next - _index);
_index = next + 1;
return true;
}
public unsafe bool UnsafeMoveNext()
{
if (!_value.HasValue || _index > _value.Length)
{
Current = default;
return false;
}
if ((_options & StringSplitOptions.RemoveEmptyEntries) == StringSplitOptions.RemoveEmptyEntries)
{
_value.UnsafeSkip(ref _index, _separators);
if (_index == _value.Length)
{
return false;
}
}
int next = _value.IndexOfAny(_separators, _index);
if (next == -1)
{
next = _value.Length;
}
Current = _value.Subsegment(_index, next - _index);
_index = next + 1;
return true;
}
public void Reset()
{
Current = default;
_index = 0;
}
}
}