如何使用Javascript正则表达式来格式化XML内容_javascript技巧



使用得是Emeditor ，在看XML文档时，总是因为格式混乱而看不清。这个是一个Emeditor宏来自动格式化XML。下载：formatXml.rar (1,021.00 bytes)
下面这段是这个网页版的javascript格式化XML的代码。
代码如下:






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*?\n<");

//把注释编码
text = text.replace(/\n/g,'\r').replace(//g,function($0, text)
{
var ret = '';
//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 + '';
//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);
}