0.1.5找回添加 .gitattributes 和 .gitignore。

2025-06-24 11:33:16 +08:00
commit f4acbffd32
21 changed files with 2311 additions and 0 deletions
@@ -0,0 +1,177 @@
+using System;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Web;
+
+namespace Hua.DotNet.Code.Helper.Html;
+
+public class HtmlHelper
+{
+	private static readonly Regex paragraphStartRegex = new Regex("<p>", RegexOptions.IgnoreCase);
+
+	private static readonly Regex paragraphEndRegex = new Regex("</p>", RegexOptions.IgnoreCase);
+
+	private static string EnsureOnlyAllowedHtml(string text)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		MatchCollection matchCollection = Regex.Matches(text, "<.*?>", RegexOptions.IgnoreCase);
+		for (int num = matchCollection.Count - 1; num >= 0; num--)
+		{
+			if (!IsValidTag(text.Substring(matchCollection[num].Index + 1, matchCollection[num].Length - 1).Trim().ToLower(), "br,hr,b,i,u,a,div,ol,ul,li,blockquote,img,span,p,em,strong,font,pre,h1,h2,h3,h4,h5,h6,address,cite"))
+			{
+				text = text.Remove(matchCollection[num].Index, matchCollection[num].Length);
+			}
+		}
+		return text;
+	}
+
+	private static bool IsValidTag(string tag, string tags)
+	{
+		string[] array = tags.Split(',');
+		if (tag.IndexOf("javascript") >= 0)
+		{
+			return false;
+		}
+		if (tag.IndexOf("vbscript") >= 0)
+		{
+			return false;
+		}
+		if (tag.IndexOf("onclick") >= 0)
+		{
+			return false;
+		}
+		char[] anyOf = new char[4] { ' ', '>', '/', '\t' };
+		int num = tag.IndexOfAny(anyOf, 1);
+		if (num > 0)
+		{
+			tag = tag.Substring(0, num);
+		}
+		if (tag[0] == '/')
+		{
+			tag = tag.Substring(1);
+		}
+		string[] array2 = array;
+		foreach (string text in array2)
+		{
+			if (tag == text)
+			{
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public static string FormatText(string text, bool stripTags, bool convertPlainTextToHtml, bool allowHtml, bool allowBBCode, bool resolveLinks, bool addNoFollowTag)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		try
+		{
+			if (stripTags)
+			{
+				text = StripTags(text);
+			}
+			text = ((!allowHtml) ? HttpUtility.HtmlEncode(text) : EnsureOnlyAllowedHtml(text));
+			if (convertPlainTextToHtml)
+			{
+				text = ConvertPlainTextToHtml(text);
+			}
+			if (resolveLinks)
+			{
+				text = ResolveLinksHelper.FormatText(text);
+			}
+		}
+		catch (Exception ex)
+		{
+			text = $"Text cannot be formatted. Error: {ex.Message}";
+		}
+		return text;
+	}
+
+	public static string StripTags(string text)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		text = Regex.Replace(text, "(>)(\\r|\\n)*(<)", "><");
+		text = Regex.Replace(text, "(<[^>]*>)([^<]*)", "$2");
+		text = Regex.Replace(text, "(&#x?[0-9]{2,4};|&quot;|&amp;|&nbsp;|&lt;|&gt;|&euro;|&copy;|&reg;|&permil;|&Dagger;|&dagger;|&lsaquo;|&rsaquo;|&bdquo;|&rdquo;|&ldquo;|&sbquo;|&rsquo;|&lsquo;|&mdash;|&ndash;|&rlm;|&lrm;|&zwj;|&zwnj;|&thinsp;|&emsp;|&ensp;|&tilde;|&circ;|&Yuml;|&scaron;|&Scaron;)", "@");
+		return text;
+	}
+
+	public static string ReplaceAnchorTags(string text)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		text = Regex.Replace(text, "<a\\b[^>]+>([^<]*(?:(?!</a)<[^<]*)*)</a>", "$1", RegexOptions.IgnoreCase);
+		return text;
+	}
+
+	public static string ConvertPlainTextToHtml(string text)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		text = text.Replace("\r\n", "<br />");
+		text = text.Replace("\r", "<br />");
+		text = text.Replace("\n", "<br />");
+		text = text.Replace("\t", "&nbsp;&nbsp;");
+		text = text.Replace("  ", "&nbsp;&nbsp;");
+		return text;
+	}
+
+	public static string ConvertHtmlToPlainText(string text, bool decode = false, bool replaceAnchorTags = false)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		if (decode)
+		{
+			text = HttpUtility.HtmlDecode(text);
+		}
+		text = text.Replace("<br>", "\n");
+		text = text.Replace("<br >", "\n");
+		text = text.Replace("<br />", "\n");
+		text = text.Replace("&nbsp;&nbsp;", "\t");
+		text = text.Replace("&nbsp;&nbsp;", "  ");
+		if (replaceAnchorTags)
+		{
+			text = ReplaceAnchorTags(text);
+		}
+		return text;
+	}
+
+	public static string ConvertPlainTextToParagraph(string text)
+	{
+		if (string.IsNullOrEmpty(text))
+		{
+			return string.Empty;
+		}
+		text = paragraphStartRegex.Replace(text, string.Empty);
+		text = paragraphEndRegex.Replace(text, "\n");
+		text = text.Replace("\r\n", "\n").Replace("\r", "\n");
+		text += "\n\n";
+		text = text.Replace("\n\n", "\n");
+		string[] array = text.Split(new char[1] { '\n' });
+		StringBuilder stringBuilder = new StringBuilder();
+		string[] array2 = array;
+		foreach (string text2 in array2)
+		{
+			if (text2 != null && text2.Trim().Length > 0)
+			{
+				stringBuilder.AppendFormat("<p>{0}</p>\n", text2);
+			}
+		}
+		return stringBuilder.ToString();
+	}
+}