67 lines
1.9 KiB
C#
67 lines
1.9 KiB
C#
//------------------------------------------------------------
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// Game Framework
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// Copyright © 2013-2021 Jiang Yin. All rights reserved.
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// Homepage: https://gameframework.cn/
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// Feedback: mailto:ellan@gameframework.cn
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//------------------------------------------------------------
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/// <summary>
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/// 对 string 的扩展方法。
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/// </summary>
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public static class StringExtension
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{
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/// <summary>
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/// 从指定字符串中的指定位置处开始读取一行。
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/// </summary>
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/// <param name="rawString">指定的字符串。</param>
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/// <param name="position">从指定位置处开始读取一行，读取后将返回下一行开始的位置。</param>
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/// <returns>读取的一行字符串。</returns>
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public static string ReadLine(this string rawString, ref int position)
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{
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if (position < 0)
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{
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return null;
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}
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int length = rawString.Length;
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int offset = position;
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while (offset < length)
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{
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char ch = rawString[offset];
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switch (ch)
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{
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case '\r':
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case '\n':
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if (offset > position)
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{
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string line = rawString.Substring(position, offset - position);
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position = offset + 1;
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if ((ch == '\r') && (position < length) && (rawString[position] == '\n'))
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{
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position++;
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}
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return line;
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}
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offset++;
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position++;
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break;
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default:
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offset++;
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break;
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}
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}
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if (offset > position)
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{
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string line = rawString.Substring(position, offset - position);
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position = offset;
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return line;
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}
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return null;
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}
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}
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