<?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
 
 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));
}
?>