C#正则实现Ubb解析类的代码
2016-02-19 13:14
生活已是百般艰难,为何不努力一点。下面图老师就给大家分享C#正则实现Ubb解析类的代码，希望可以让热爱学习的朋友们体会到设计的小小的乐趣。
包含了标题,链接,字体,对齐,图片,引用,列表等方面的功能.
Ubb.ReadMe.htm
代码如下:
//作者:deerchao
// http://www.unibetter.com/blogs/blogdeerchao/default.aspx
//在不移除以上(及本条)注释的前提下,任何人可以以任何方式使用此代码.
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, @"rn", "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]", "blockquotediv", 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);
return result;
}
}
}
