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一个好用的UBB类！-PHP教程,PHP应用

2006-07-15 分类：PHP 阅读(1074) 评论(0)
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<?php
/*
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
       一个好用的UBB类！-PHP教程,PHP应用
       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]
       [code][/code]
       [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."<br>";
             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<br>";
            $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,$value){
      return <.$start.>.$value.</.$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 <a href=".$trim_value." .$this->attr_url.>.$value.</a>;
      else return [.$start.].$value.[/.$end.];
   }

   function email($start,$end,$value){
      if(emailcheck($value)) return <a href="mailto:.$value.">.$value.</a>;
      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($trim_value)))
               return <img src=".$trim_value."></img>;
      else return [.$start.].$value.[/.$end.];
   }
}

//测试
echo <html>;
echo <head><title>测试</title></head>;
echo <body>;
echo <form action=".str2url($path_info)." method="post">;
echo <textarea cols="100" rows="10" name="ubb">.htmlencode4textarea($ubb).</textarea><br>;
echo <input type="submit" value="转换">;
echo </form>;

if(isset($ubb)){
   $ubbcode = new ubbcode(target="_blank");
   echo <hr>.$ubbcode->parse($ubb);
}

echo </body>;
echo </html>;

?>

文件urlcheck.php的内容
<?php
//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<1) return false;
      $prot = substr($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
<?php
//otherfunc.php
function htmlencode($str){
   $str = (string)$str;

   $ret = ;
   $len = strlen($str);
   $nl = false;
   for($i=0;$i<$len;$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 .= <br>;
               $nl = true;
            }
            break;
         case chr(13):
            if($nl) $nl = false;
            else{
               $ret .= <br>;
               $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<$len;$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));
}
?>

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