一个好用的UBB类！

ubb

/*
如有转载，请注明作者

原作者: 何志强
改进:   SonyMusic[sonymusic@163.net]
文件:   ubb.php
备注:   说是改进，其实核心函数parse()已经完全重写了，而且思路也是不一样的。
        不过仍是受何志强的例子的启发，而且测试的例子还有URLCHECK等几个函数也是沿用的何志强的程序，谢谢何志强。
        目前还没有颜色的功能，但我会加入的。
        如果在程序上有什么BUG或不便的地方，请给我MAIL。
        谢谢！
改进功能:
    对字符串进行UBB编码,该类目前只支持下列几个简单且实用的编码:
    1. URL裢接
       http://phpuser.com/
       http://头可以不需要
       如phpuser.com也是可以的。
    2. Email裢接
       sonymusic@163.net
    3. 图片裢接
       
       同URL链接一样，前面的http也可以不要。
    4. 文字方面
       粗体字
       斜体字
       加下划线
       

1号标题字

...

6号标题字

       
       
       [tt][/tt]
       [s][/s]
       
       [em][/em]
       [strong][/strong]
       
       [samp][/samp]
       [kbd][/kbd]
       [var][/var]
       [dfn][/dfn]
       [cite][/cite]
       
       
       
    注意以下几点:
    1. url,email,img等标签是不分大小写的.
    2. 在标签中不允许有TAB键出现，但空格允许。
    3. 该类要调用htmlencode,htmlencode4textarea,emailcheck函数和urlcheck类.
    4. 修改后支持嵌套，但url,email,img这三个标签不是允许嵌套的。
技术资料:
    Ultimate Bulletin Board
        http://www.ultimatebb.com/
    What is UBB Code
        http://www.scriptkeeper.com/ubb/ubbcode.html
*/

include("urlcheck.php");
include("otherfunc.php"); //这两个文件的内容，附在最后。

//ubbcode类
class ubbcode{
    var $call_time=0;
   //可处理标签及处理函数对应表
   var $tags = array(  //小写的标签 => 对应的处理函数
                       'url' => '$this->url',
                       'email' => '$this->email',
                       'img' => '$this->img',
                       'b' => '$this->simple',
                       'i' => '$this->simple',
                       'u' => '$this->simple',
                       'tt' => '$this->simple',
                       's' => '$this->simple',
                       'strike' => '$this->simple',
                       'h1' => '$this->simple',
                       'h2' => '$this->simple',
                       'h3' => '$this->simple',
                       'h4' => '$this->simple',
                       'h5' => '$this->simple',
                       'h6' => '$this->simple',
                       'sup' => '$this->simple',
                       'sub' => '$this->simple',
                       'em' => '$this->simple',
                       'strong' => '$this->simple',
                       'code' => '$this->simple',
                       'samp' => '$this->simple',
                       'kbd' => '$this->simple',
                       'var' => '$this->simple',
                       'dfn' => '$this->simple',
                       'cite' => '$this->simple',
                       'small' => '$this->simple',
                       'big' => '$this->simple',
                       'blink' => '$this->simple'
                    );
   //url裢接属性
   var $attr_url;
   //url合法性检查对象
   var $urlcheck;

   function ubbcode($attr_url){
      $this->attr_url = ''.$attr_url;
      $this->urlcheck = new urlcheck();
   }

   //对$str进行UBB编码解析
   function parse($str){
           $this->call_time++;
      $parse = ''.htmlencode($str);

      $ret = '';
      while(true){
          $eregi_ret=eregi("\[[#]{0,1}[[:alnum:]]{1,7}\]",$parse,$eregi_arr); //查找[xx]
        if(!$eregi_ret){
            $ret .= $parse;
            break;  //如果没有，返回
         }
         $pos = @strpos($parse,$eregi_arr[0]);
         $tag_len=strlen($eregi_arr[0])-2;//标记长度
        $tag_start=substr($eregi_arr[0],1,$tag_len);
        $tag=strtolower($tag_start);
        
         if((($tag=="url") or ($tag=="email") or ($tag=="img")) and ($this->call_time>1)){
             echo $this->call_time."
";
             return $parse;//如果不能是不能嵌套的标记，直接返回
        }
        
         $parse2 = substr($parse,0,$pos);//标记之前
         $parse = substr($parse,$pos+$tag_len+2);//标记之后
         if(!isset($this->tags[$tag])){
             echo "$tag_start
";
            $ret .= $parse2.'['.$tag_start.']';
            continue;//如果是不支持的标记
         }
        
         //查找对对应的结束标记
         $eregi_ret=eregi("\[\/".$tag."\]",$parse,$eregi_arr);
         if(!$eregi_ret){
            $ret .= $parse2.'['.$tag_start.']';
            continue;//如果没有对应该的结束标记
         }
         $pos=strpos($parse,$eregi_arr[0]);
         $value=substr($parse,0,$pos);//这是起止标记之间的内容
         $tag_end=substr($parse,$pos+2,$tag_len);
         $parse=substr($parse,$pos+$tag_len+3);//结束标记之后的内容
         
         if(($tag!="url") and ($tag!="email") and ($tag!="img")){
             $value=$this->parse($value);
        }

         $ret .= $parse2;
         eval('$ret .= '.$this->tags[$tag].'("'.$tag_start.'","'.$tag_end.'","'.$value.'");');
      }
        $this->call_time--;
      return $ret;
   }

   function simple($start,$end,$value){
      return ''.$value.''.$end.'>';
   }

   function url($start,$end,$value){
           $trim_value=trim($value);
        if (strtolower(substr($trim_value,0,7))!="http://")
            $trim_value="http://".$trim_value;
      if($this->urlcheck->check($trim_value)) return 'attr_url.'>'.$value.'';
      else return '['.$start.']'.$value.'[/'.$end.']';
   }

   function email($start,$end,$value){
      if(emailcheck($value)) return ''.$value.'';
      else return '['.$start.']'.$value.'[/'.$end.']';
   }

   function img($start,$end,$value){
           $trim_value=trim($value);
        if ((strtolower(substr($trim_value,0,7))!="http://") or ($this->urlcheck->check($trim_value)))
               return '';
      else return '['.$start.']'.$value.'[/'.$end.']';
   }
}

//测试
echo '';
echo '';
echo '';
echo '

';
echo ''.htmlencode4textarea($ubb).'
';
echo '';
echo '

';

if(isset($ubb)){
   $ubbcode = new ubbcode('target="_blank"');
   echo '

---

'.$ubbcode->parse($ubb);
}

echo '';
echo '';

?>

文件urlcheck.php的内容
//urlcheck.php
class urlcheck{
   var $regex = array(//协议名(注意在这里必须写成小写) => 对应的正则表达式
                      'ftp' => '$this->ftpurl',
                      'file' => '$this->fileurl',
                      'http' => '$this->httpurl',
                      'https' => '$this->httpurl',
                      'gopher' => '$this->gopherurl',
                      'news' => '$this->newsurl',
                      'nntp' => '$this->nntpurl',
                      'telnet' => '$this->telneturl',
                      'wais' => '$this->waisurl'
                     );

   var $lowalpha;
   var $hialpha;
   var $alpha;
   var $digit;
   var $safe;
   var $extra;
   var $national;
   var $punctuation;
   var $reserved;
   var $hex;
   var $escape;
   var $unreserved;
   var $uchar;
   var $xchar;
   var $digits;

   var $urlpath;
   var $password;
   var $user;
   var $port;
   var $hostnumber;
   var $alphadigit;
   var $toplabel;
   var $domainlabel;
   var $hostname;
   var $host;
   var $hostport;
   var $login;

   //ftp
   var $ftptype;
   var $fsegment;
   var $fpath;
   var $ftpurl;

   //file
   var $fileurl;

   //http,https
   var $search;
   var $hsegment;
   var $hpath;
   var $httpurl;

   //gopher
   var $gopher_string;
   var $selector;
   var $gtype;
   var $gopherurl;

   //news
   var $article;
   var $group;
   var $grouppart;
   var $newsurl;

   //nntp
   var $nntpurl;

   //telnet
   var $telneturl;

   //wais
   var $wpath;
   var $wtype;
   var $database;
   var $waisdoc;
   var $waisindex;
   var $waisdatabase;
   var $waisurl;

   function check($url){
      $pos = @strpos($url,':',1);
      if($pos      $prot = substr($url,0,$pos);
      if(!isset($this->regex[$prot])) return false;
      eval('$regex = '.$this->regex[$prot].';');
      return ereg('^'.$regex.'$',$url);
   }

   function urlcheck(){
      $this->lowalpha = '[a-z]';
      $this->hialpha = '[A-Z]';
      $this->alpha = '('.$this->lowalpha.'|'.$this->hialpha.')';
      $this->digit = '[0-9]';
      $this->safe = '[$.+_-]';
      $this->extra = '[*()\'!,]';
      $this->national = '([{}|\^~`]|\\[|\\])';
      $this->punctuation = '[#%"]';
      $this->reserved = '[?;/:@&=]';
      $this->hex = '('.$this->digit.'|[a-fA-F])';
      $this->escape = '(%'.$this->hex.'{2})';
      $this->unreserved = '('.$this->alpha.'|'.$this->digit.'|'.$this->safe.'|'.$this->extra.')';
      $this->uchar = '('.$this->unreserved.'|'.$this->escape.')';
      $this->xchar = '('.$this->unreserved.'|'.$this->reserved.'|'.$this->escape.')';
      $this->digits = '('.$this->digit.'+)';

      $this->urlpath = '('.$this->xchar.'*)';
      $this->password = '(('.$this->uchar.'|[?;&=]'.')*)';
      $this->user = '(('.$this->uchar.'|[?;&=]'.')*)';
      $this->port = $this->digits;
      $this->hostnumber = '('.$this->digits.'.'.$this->digits.'.'.$this->digits.'.'.$this->digits.')';
      $this->alphadigit = '('.$this->alpha.'|'.$this->digit.')';
      $this->toplabel = '('.$this->alpha.'|('.$this->alpha.'('.$this->alphadigit.'|-)*'.$this->alphadigit.'))';
      $this->domainlabel = '('.$this->alphadigit.'|('.$this->alphadigit.'('.$this->alphadigit.'|-)*'.$this->alphadigit.'))';
      $this->hostname = '(('.$this->domainlabel.'\\.)*'.$this->toplabel.')';
      $this->host = '('.$this->hostname.'|'.$this->hostnumber.')';
      $this->hostport = '('.$this->host.'(:'.$this->port.')?)';
      $this->login = '(('.$this->user.'(:'.$this->password.')?@)?'.$this->hostport.')';

      $this->ftptype = '[aidAID]';
      $this->fsegment = '(('.$this->uchar.'|[?:@&=])*)';
      $this->fpath = '('.$this->fsegment.'(/'.$this->fsegment.')*)';
      $this->ftpurl = '([fF][tT][pP]://'.$this->login.'(/'.$this->fpath.'(;[tT][yY][pP][eE]='.$this->ftptype.')?)?)';

      $this->fileurl = '([fF][iI][lL][eE]://('.$this->host.'|[lL][oO][cC][aA][lL][hH][oO][sS][tT])?/'.$this->fpath.')';

      $this->search = '(('.$this->uchar.'|[;:@&=])*)';
      $this->hsegment = '(('.$this->uchar.'|[;:@&=])*)';
      $this->hpath = '('.$this->hsegment.'(/'.$this->hsegment.')*)';
      $this->httpurl = '([hH][tT][tT][pP][sS]?://'.$this->hostport.'(/'.$this->hpath.'([?]'.$this->search.')?)?)';

      $this->gopher_string = '('.$this->xchar.'*)';
      $this->selector = '('.$this->xchar.'*)';
      $this->gtype = $this->xchar;
      $this->gopherurl = '([gG][oO][pP][hH][eE][rR]://'.$this->hostport.'(/('.$this->gtype.'('.$this->selector.'(%09'.$this->search.'(%09'.$this->gopher_string.')?)?)?)?)?)';

      $this->article = '(('.$this->uchar.'|[;/?:&=])+@'.$this->host.')';
      $this->group = '('.$this->alpha.'('.$this->alpha.'|'.$this->digit.'|[-.+_])*)';
      $this->grouppart = '([*]|'.$this->group.'|'.$this->article.')';
      $this->newsurl = '([nN][eE][wW][sS]:'.$this->grouppart.')';

      $this->nntpurl = '([nN][nN][tT][pP]://'.$this->hostport.'/'.$this->group.'(/'.$this->digits.')?)';

      $this->telneturl = '([tT][eE][lL][nN][eE][tT]://'.$this->login.'/?)';

      $this->wpath = '('.$this->uchar.'*)';
      $this->wtype = '('.$this->uchar.'*)';
      $this->database = '('.$this->uchar.'*)';
      $this->waisdoc = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.'/'.$this->wtype.'/'.$this->wpath.')';
      $this->waisindex = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.'[?]'.$this->search.')';
      $this->waisdatabase = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.')';
      $this->waisurl = '('.$this->waisdatabase.'|'.$this->waisindex.'|'.$this->waisdoc.')';
   }
}

?>


文件otherfunc.php的内容
//otherfunc.php
function htmlencode($str){
   $str = (string)$str;

   $ret = '';
   $len = strlen($str);
   $nl = false;
   for($i=0;$i      $chr = $str[$i];
      switch($chr){
         case '            $ret .= '            $nl = false;
            break;
         case '>':
            $ret .= '>';
            $nl = false;
            break;
         case '"':
            $ret .= '"';
            $nl = false;
            break;
         case '&':
            $ret .= '&';
            $nl = false;
            break;
/*
         case ' ':
            $ret .= ' ';
            $nl = false;
            break;
*/        
         case chr(9):
            $ret .= '    ';
            $nl = false;
            break;
         case chr(10):
            if($nl) $nl = false;
            else{
               $ret .= '
';
               $nl = true;
            }
            break;
         case chr(13):
            if($nl) $nl = false;
            else{
               $ret .= '
';
               $nl = true;
            }
            break;
         default:
            $ret .= $chr;
            $nl = false;
            break;
      }
   }

   return $ret;
}


function htmlencode4textarea($str){
   $str = (string)$str;

   $ret = '';
   $len = strlen($str);
   for($i=0;$i      $chr = $str[$i];
      switch($chr){
         case '            $ret .= '            break;
         case '>':
            $ret .= '>';
            break;
         case '"':
            $ret .= '"';
            break;
         case '&':
            $ret .= '&';
            break;
         case ' ':
            $ret .= ' ';
            break;
         case chr(9):
            $ret .= '    ';
            break;
         default:
            $ret .= $chr;
            break;
      }
   }

   return $ret;
}

function emailcheck($email){
   $ret=false;
   if(strstr($email, '@') && strstr($email, '.')){
      if(eregi("^([_a-z0-9]+([\\._a-z0-9-]+)*)@([a-z0-9]{2,}(\\.[a-z0-9-]{2,})*\\.[a-z]{2,3})$", $email)){
         $ret=true;
      }
   }
   return $ret;
}

function str2url($path){
   return eregi_replace("%2f","/",urlencode($path));
}
?>