csharp-sdk-upm/Libs/Newtonsoft.Json.AOT/Utilities/StringReference.cs

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2021-03-31 11:22:02 +08:00
#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
namespace LC.Newtonsoft.Json.Utilities
{
internal readonly struct StringReference
{
private readonly char[] _chars;
private readonly int _startIndex;
private readonly int _length;
public char this[int i] => _chars[i];
public char[] Chars => _chars;
public int StartIndex => _startIndex;
public int Length => _length;
public StringReference(char[] chars, int startIndex, int length)
{
_chars = chars;
_startIndex = startIndex;
_length = length;
}
public override string ToString()
{
return new string(_chars, _startIndex, _length);
}
}
internal static class StringReferenceExtensions
{
public static int IndexOf(this StringReference s, char c, int startIndex, int length)
{
int index = Array.IndexOf(s.Chars, c, s.StartIndex + startIndex, length);
if (index == -1)
{
return -1;
}
return index - s.StartIndex;
}
public static bool StartsWith(this StringReference s, string text)
{
if (text.Length > s.Length)
{
return false;
}
char[] chars = s.Chars;
for (int i = 0; i < text.Length; i++)
{
if (text[i] != chars[i + s.StartIndex])
{
return false;
}
}
return true;
}
public static bool EndsWith(this StringReference s, string text)
{
if (text.Length > s.Length)
{
return false;
}
char[] chars = s.Chars;
int start = s.StartIndex + s.Length - text.Length;
for (int i = 0; i < text.Length; i++)
{
if (text[i] != chars[i + start])
{
return false;
}
}
return true;
}
}
}