解析颜色符号-优快云博客

本文介绍了一个用于解析内嵌颜色符号的方法，如[FFAA00]设置颜色或[-]撤销颜色改变，并提供了一种从字符串中移除所有颜色编码符号的技术。

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	/// <summary>
	/// Parse an embedded symbol, such as [FFAA00] (set color) or [-] (undo color change)
	/// </summary>

	static public int ParseSymbol (string text, int index, List<Color> colors, bool premultiply)
	{
		int length = text.Length;

		if (index + 2 < length)
		{
			if (text[index + 1] == '-')
			{
				if (text[index + 2] == ']')
				{
					if (colors != null && colors.Count > 1) colors.RemoveAt(colors.Count - 1);
					return 3;
				}
			}
			else if (index + 7 < length)
			{
				if (text[index + 7] == ']')
				{
					if (colors != null)
					{
						Color c = ParseColor(text, index + 1);

						if (EncodeColor(c) != text.Substring(index + 1, 6).ToUpper())
							return 0;

						c.a = colors[colors.Count - 1].a;
						if (premultiply && c.a != 1f)
							c = Color.Lerp(mInvisible, c, c.a);

						colors.Add(c);
					}
					return 8;
				}
			}
		}
		return 0;
	}

	/// <summary>
	/// Runs through the specified string and removes all color-encoding symbols.
	/// </summary>

	static public string StripSymbols (string text)
	{
		if (text != null)
		{
			for (int i = 0, imax = text.Length; i < imax; )
			{
				char c = text[i];

				if (c == '[')
				{
					int retVal = ParseSymbol(text, i, null, false);

					if (retVal > 0)
					{
						text = text.Remove(i, retVal);
						imax = text.Length;
						continue;
					}
				}
				++i;
			}
		}
		return text;
	}