使用Javascript正则表达式来格式化XML内容

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
    <script type="text/javascript">
    String.prototype.removeLineEnd = function()
    {
        return this.replace(/(<.+?\s+?)(?:\n\s*?(.+?=".*?"))/g,'$1 $2')
    }
    function formatXml(text)
    {
        //去掉多余的空格
        text = '\n' + text.replace(/(<\w+)(\s.*?>)/g,function($0, name, props)
        {
            return name + ' ' + props.replace(/\s+(\w+=)/g," $1");
        }).replace(/>\s*?</g,">\n<");
        
        //把注释编码
        text = text.replace(/\n/g,'\r').replace(/<!--(.+?)-->/g,function($0, text)
        {
            var ret = '<!--' + escape(text) + '-->';
            //alert(ret);
            return ret;
        }).replace(/\r/g,'\n');
        
        //调整格式
        var rgx = /\n(<(([^\?]).+?)(?:\s|\s*?>|\s*?(\/)>)(?:.*?(?:(?:(\/)>)|(?:<(\/)\2>)))?)/mg;
        var nodeStack = [];
        var output = text.replace(rgx,function($0,all,name,isBegin,isCloseFull1,isCloseFull2 ,isFull1,isFull2){
            var isClosed = (isCloseFull1 == '/') || (isCloseFull2 == '/' ) || (isFull1 == '/') || (isFull2 == '/');
            //alert([all,isClosed].join('='));
            var prefix = '';
            if(isBegin == '!')
            {
                prefix = getPrefix(nodeStack.length);
            }
            else 
            {
                if(isBegin != '/')
                {
                    prefix = getPrefix(nodeStack.length);
                    if(!isClosed)
                    {
                        nodeStack.push(name);
                    }
                }
                else
                {
                    nodeStack.pop();
                    prefix = getPrefix(nodeStack.length);
                }

            
            }
                var ret =  '\n' + prefix + all;
                return ret;
        });
        
        var prefixSpace = -1;
        var outputText = output.substring(1);
        //alert(outputText);
        
        //把注释还原并解码，调格式
        outputText = outputText.replace(/\n/g,'\r').replace(/(\s*)<!--(.+?)-->/g,function($0, prefix,  text)
        {
            //alert(['[',prefix,']=',prefix.length].join(''));
            if(prefix.charAt(0) == '\r')
                prefix = prefix.substring(1);
            text = unescape(text).replace(/\r/g,'\n');
            var ret = '\n' + prefix + '<!--' + text.replace(/^\s*/mg, prefix ) + '-->';
            //alert(ret);
            return ret;
        });
        
        return outputText.replace(/\s+$/g,'').replace(/\r/g,'\r\n');

    }

    function getPrefix(prefixIndex)
    {
        var span = '    ';
        var output = [];
        for(var i = 0 ; i < prefixIndex; ++i)
        {
            output.push(span);
        }
        
        return output.join('');
    }        
        function btnFormat_click()
        {
            var $ = document.getElementById;
            $('output').value = formatXml($('input').value);
        }
        
    </script>
    
 </HEAD>

 <BODY>
      <textarea id="input" style="width:100%;height:45%;"></textarea>
    <div style="margin:0px auto;"><input type="button" id="btnFormat" onclick="btnFormat_click()" value="格式化" style="width:50%;height:10%;"/></div>
    <textarea id="output" style="width:100%;height:45%;"></textarea>
 </BODY>
</HTML>

转自：http://www.cnblogs.com/evlon/archive/2009/01/09/1372283.html

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