using System; using System.Collections.Generic; using System.Text; using System.Web; using System.Text.RegularExpressions;
namespace Deerchao.Web { public class UbbDecoder { private static readonly RegexOptions options = RegexOptions.Compiled | RegexOptions.Singleline;
/// <summary> /// 解析Ubb代码为Html代码 /// </summary> /// <param name="ubb">Ubb代码</param> /// <returns>解析得到的Html代码</returns> public static string Decode(string ubb) { if (string.IsNullOrEmpty(ubb)) return null; string result = ubb; result = HttpUtility.HtmlEncode(result);
result = DecodeStyle(result); result = DecodeFont(result); result = DecodeColor(result); result = DecodeImage(result); result = DecodeLinks(result); result = DecodeQuote(result); result = DecodeAlign(result); result = DecodeList(result); result = DecodeHeading(result); result = DecodeBlank(result);
return result; }
/// <summary> /// 解析Ubb代码为Html代码,所有的链接为rel="nofollow" /// </summary> /// <param name="ubb">Ubb代码</param> /// <returns>解析得到的Html代码</returns> public static string DecodeNoFollow(string ubb) { if (string.IsNullOrEmpty(ubb)) return null; string result = ubb; result = HttpUtility.HtmlEncode(result);
result = DecodeStyle(result); result = DecodeFont(result); result = DecodeColor(result); result = DecodeImage(result); result = DecodeLinksNoFollow(result); result = DecodeQuote(result); result = DecodeAlign(result); result = DecodeList(result); result = DecodeHeading(result); result = DecodeBlank(result);
return result; }
private static string DecodeHeading(string ubb) { string result = ubb; result = Regex.Replace(result, @"\[h(\d)\](.*?)\[/h\1\]", "<h$1>$2</h$1>", options); return result; }
private static string DecodeList(string ubb) { string sListFormat = "<ol style=\"list-style:{0};\">$1</ol>"; string result = ubb; // Lists result = Regex.Replace(result, @"\[\*\]([^\[]*)", "<li>$1</li>", options); result = Regex.Replace(result, @"\[list\]\s*(.*?)\[/list\]", "<ul>$1</ul>", options); result = Regex.Replace(result, @"\[list=1\]\s*(.*?)\[/list\]", string.Format(sListFormat, "decimal"), options); result = Regex.Replace(result, @"\[list=i\]\s*(.*?)\[/list\]", string.Format(sListFormat, "lower-roman"), options); result = Regex.Replace(result, @"\[list=I\]\s*(.*?)\[/list\]", string.Format(sListFormat, "upper-roman"), options); result = Regex.Replace(result, @"\[list=a\]\s*(.*?)\[/list\]", string.Format(sListFormat, "lower-alpha"), options); result = Regex.Replace(result, @"\[list=A\]\s*(.*?)\[/list\]", string.Format(sListFormat, "upper-alpha"), options);
return result; }
private static string DecodeBlank(string ubb) { string result = ubb;
result = Regex.Replace(result, @"(?<= ) | (?= )", " ", options); result = Regex.Replace(result, @"\r\n", "<br />"); string[] blockTags = {"h[1-6]", "li", "list", "div", "p", "ul"}; //clear br before block tags(start or end) foreach (string tag in blockTags) { Regex r = new Regex("<br />(<" + tag + ")",options); result = r.Replace(result, "$1"); r = new Regex("<br />(</" + tag + ")",options); result = r.Replace(result, "$1"); } return result; }
private static string DecodeAlign(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[left\](.*?)\[/left\]", "<div style=\"text-align:left\">$1</div>", options); result = Regex.Replace(result, @"\[right\](.*?)\[/right\]", "<div style=\"text-align:right\">$1</div>", options); result = Regex.Replace(result, @"\[center\](.*?)\[/center\]", "<div style=\"text-align:center\">$1</div>", options);
return result; }
private static string DecodeQuote(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[quote\]", "<blockquote><div>", options); result = Regex.Replace(result, @"\[/quote\]", "</div></blockquote>", options); return result; }
private static string DecodeFont(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[size=([-\w]+)\](.*?)\[/size\]", "<span style=\"font-size:$1\">$2</span>", options); result = Regex.Replace(result, @"\[font=(.*?)\](.*?)\[/font\]", "<span style=\"font-family:$1\">$2</span>", options); return result; }
private static string DecodeLinks(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[url\]www\.(.*?)\[/url\]", "<a href=\"http://www.$1\">$1</a>", options); result = Regex.Replace(result, @"\[url\](.*?)\[/url\]", "<a href=\"$1\">$1</a>", options); result = Regex.Replace(result, @"\[url=(.*?)\](.*?)\[/url\]", "<a href=\"$1\" title=\"$2\">$2</a>", options); result = Regex.Replace(result, @"\[email\](.*?)\[/email\]", "<a href=\"mailto:$1\">$1</a>", options); return result; }
private static string DecodeLinksNoFollow(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[url\]www\.(.*?)\[/url\]", "<a rel=\"nofollow\" href=\"http://www.$1\">$1</a>", options); result = Regex.Replace(result, @"\[url\](.*?)\[/url\]", "<a rel=\"nofollow\" href=\"$1\">$1</a>", options); result = Regex.Replace(result, @"\[url=(.*?)\](.*?)\[/url\]", "<a rel=\"nofollow\" href=\"$1\" title=\"$2\">$2</a>", options); result = Regex.Replace(result, @"\[email\](.*?)\[/email\]", "<a href=\"mailto:$1\">$1</a>", options); return result; }
private static string DecodeImage(string ubb) { string result = ubb;
result = Regex.Replace(result, @"\[hr\]", "<hr />", options); result = Regex.Replace(result, @"\[img\](.+?)\[/img\]", "<img src=\"$1\" alt=\"\" />", options); result = Regex.Replace(result, @"\[img=(\d+)x(\d+)\](.+?)\[/img\]", "<img src=\"$3\" style=\"width:$1px;height:$2px\" alt=\"\" />", options);
return result; }
private static string DecodeColor(string ubb) { string result = ubb; result = Regex.Replace(result, @"\[color=(#?\w+?)\](.+?)\[/color\]", "<span style=\"color:$1\">$2</span>",options);
return result; }
private static string DecodeStyle(string ubb) { string result=ubb; //we don't need this for perfomance and other consideration: //(<table[^>]*>(?><table[^>]*>(?<Depth>)|</table>(?<-Depth>)|.)+(?(Depth)(?!))</table>) result = Regex.Replace(result, @"\[[b]\](.*?)\[/[b]\]", "<strong>$1</strong>", options); result = Regex.Replace(result, @"\[[u]\](.*?)\[/[u]\]", "<span style=\"text-decoration:underline\">$1</span>", options); result = Regex.Replace(result, @"\[[i]\](.*?)\[/[i]\]", "<i>$1</i>", options);
