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)](.*?)[/h1]", "<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, @"
", "<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);