code:使用php构建的xml分析器 (基础版)

使用php构建的xml分析器 (基础版) 
tags:php,xml,parser,code,fallseir
author:fallseir.lee : http://fallseir.livejournal.com
 <?php
$p =& new simplexmlparser();
$p->parse ('/var/www/html/tests/wellformed/sanitize/item_xhtml_body_style.xml');
echo  $p->tosimplexml();
//print_r($p->document);
//print_r($p->stack); 
?>

<?php  class simplexmlparser
 {
  //记录当前处理队列   var $stack=array();   //root树   var $document=array("namespaces" =>array());   //parser   var $xml_parser;   //构造函数   function __construct()   {        $this->xml_parser = xml_parser_create();         xml_set_object($this->xml_parser, $this);         xml_set_character_data_handler($this->xml_parser , 'c_data_Handler');
        xml_set_element_handler ($this->xml_parser, "start_tag_Handler" ,"end_tag_Handler");   }   //处理开始标记   function start_tag_Handler($parser,$tag ,$attrs)   {    $t=$tag;    $ns=null;    $atts=array();          //处理命名空间          foreach($attrs as  $name=>$value)          {           if(eregi  ( "^xmlns:^xmlns$", $name)){
            //取得命名空间的缩写                       if(strpos( $name,':'))            {             list($temp, $name)=split(':' ,$name,2);            }else            {             $name=null;             $uncount=0;           
             foreach($this->document["namespaces" ] as $n=>$v )             {              if(strpos( $n,'#'))              {               $c=str_replace('#' ,'');               if($uncount<(int )$c)               {                $uncount=$c;               }              }              if($value==$v )              {               $name=$n;              }             }             //创建默认缩写             if($name===null)             {              $name="#".($uncount +1);             }             $ns=$name;            }            //添加名称空间      if(!array_key_exists( $name,$this->document["namespaces" ]))      {       $this->document["namespaces"][ $name]=$value;      }           }else        {         $atts[$name]= $value;        }          }          //获取当前的名称控件缩写    if ( strpos(  $t, ':' ) ) {
               list($ns, $t ) = split( ':',  $t, 2);
         }
   //if($t==""){echo "$tag is null";return;}       $current=array("name"=> $t,"attributes"=>$atts, "nodes"=>array());          if($ns===null and count ($this->stack)>0)          {                  $ns=$this->stack[count ($this->stack)-1][ "namespace"];       }       $current["namespace"]= $ns;      
   array_push($this->stack ,$current);   }   //处理内容数据   function c_data_Handler($parser,$data )   {       $current=$this->stack[count ($this->stack)-1];    $current["nodes"][]= $data;       $this->stack[count( $this->stack)-1]=$current ;   }   //处理结束标记   function end_tag_Handler($parser,$tag )   {       $current=array_pop($this->stack );       if(count( $this->stack)!=0)       {        $parent=$this->stack[count ($this->stack)-1];        $parent["nodes"][ $current["name"]]=$current ;        $this->stack[count( $this->stack)-1]=$parent ;       }else    {     $this->document["root"]= $current;    }   }         function tosimplexml()      {       $xmlstr= "<?xml version=\" 1.0\" encoding=\" utf-8\"?>";    $xmlstr.= $this->randernode($this ->document["root"],$this->document ["namespaces"],"" ,true);    return $xmlstr;      }      /*       * node 处理的节点       * ns 名称空间表       * pns 父节点的前缀       * isroot 是否是根节点       */   function randernode($node,$ns= null,$pns="", $isroot=false)   {    $name=strtolower($node ['name']);    //输出默认命名空间    $namespace=null;    $isdefns=false;    if(ereg( "^#",$node['namespace' ]))    {     $namespace="xmlns=\"" .$ns[$node[ 'namespace']]."\"" ;     $isdefns=true;    }    $prx=$node['namespace' ];    //判断是否继承了名称空间    if($pns!=$prx and  (!$isdefns))    {     $name=strtolower(" $prx:$name");    }else if($pns== $prx  and $isdefns)    {     $namespace=null;    }    $xmlstr="<{$name} " ;    if($namespace!=null)    {     $xmlstr.=$namespace." ";    }    $xmlstr.=$this->randerattribute($node ["attributes"]);    if(ns!==null and $isroot)    {     $xmlstr.=$this->randernamespace($ns );    }    $xmlstr.=">";    $xmlstr.=$this->randernodes($node ["nodes"],$ns ,$prx);    $xmlstr.="</{$name}>" ;    return $xmlstr;
  }
  function randernamespace ($ns)   {    $xmlstr="";    if($ns!==null)    {     foreach($ns as  $n=>$v)     {      if(!ereg( "#",$n))      {       $xmlstr.=strtolower($n )."=\"$v\"  ";      }     }    }    return $xmlstr;   }   function randerattribute($attrs)   {    $xmlstr="";    foreach($attrs as  $n=>$v)    {     $xmlstr.= strtolower($n )."=\"$v\"  ";    }    return $xmlstr;   }   function randernodes($nodes,$ns ,$prx)   {    $xmlstr="";    foreach($nodes as  $n=>$v)    {     if(is_array( $v))     {      $xmlstr.= $this->randernode($v ,$ns,$prx );     }else     {      $xmlstr.= $v ;     }     }    return $xmlstr;   }   //测试   function parse($path){
        if  (!($fp = fopen ($path, "r"))) {
             die("Cannot open XML data file: $path ");             return false;         }          while ($data = fread ($fp, 4096)) {
             if (!xml_parse($this->xml_parser , $data, feof( $fp))) {
                die(sprintf ("XML error: %s at line %d",                 xml_error_string(xml_get_error_code ($this->xml_parser)),                 xml_get_current_line_number($this->xml_parser )));                 xml_parser_free($this->xml_parser );             }         }      fclose($fp);         return true;     }  } ?> 

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