Rmm 分词算法代码片段

function SplitRMM($str=""){
   if($str!="") $this->SetSource(trim($str));
   if($this->SourceString=="") return "";
   //对文本进行粗分
   $this->SourceString = $this->ReviseString($this->SourceString);
   //对特定文本进行分离
   $spwords = explode(" ",$this->SourceString);
   $spLen = count($spwords);
   $spc = $this->SplitChar;
   for($i=($spLen-1);$i>=0;$i--){
    if(trim($spwords[$i])=="") continue;
    if($this->NotGBK($spwords[$i])){
     if(ereg("[^0-9.+-]",$spwords[$i]))
     { $this->ResultString = $spwords[$i].$spc.$this->ResultString; }
     else
     {
      $nextword = "";
      @$nextword = substr($this->ResultString,0,strpos($this->ResultString," "));
      if(ereg("^".$this->CommonUnit,$nextword)){
       $this->ResultString = $spwords[$i].$this->ResultString;
      }else{
       $this->ResultString = $spwords[$i].$spc.$this->ResultString;
      }
     }
    }
    else
    {
      $c = $spwords[$i][0].$spwords[$i][1];
      $n = hexdec(bin2hex($c));
      if($c=="《") //书名
      { $this->ResultString = $spwords[$i].$spc.$this->ResultString; }
      else if($n>0xA13F && $n       { $this->ResultString = $spwords[$i].$spc.$this->ResultString; }
      else //正常短句
      {
       if(strlen($spwords[$i]) SplitLen)
       {
        //如果结束符为特殊分割词，分离处理
        if(ereg($this->EspecialChar."$",$spwords[$i],$regs)){
          $spwords[$i] = ereg_replace($regs[0]."$","",$spwords[$i]).$spc.$regs[0];
        }
        //是否为常用单位
        if(!ereg("^".$this->CommonUnit,$spwords[$i]) || $i==0){
         $this->ResultString = $spwords[$i].$spc.$this->ResultString;
        }else{
         $this->ResultString = $spwords[$i-1].$spwords[$i].$spc.$this->ResultString;
         $i--;
        }
       }
       else
       {
        $this->ResultString = $this->RunRMM($spwords[$i]).$spc.$this->ResultString;
       }
      }
     }
   }
   return $this->ResultString;
  }