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, @"(?= ) | (?= )", "nbsp;", 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);
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