从XML到JSON的转换代码
今天写的一段代码,用于将XML的对象/字符串转化成JSON的对象/字符串。
网上有一个这样的代码的,不过那个拼字符串拼出来……满屏的正则表达式,于是也没有细看……而且那个是LGPL的License,用起来还是有顾忌的。
随便写了写。这东西本来就应该封个包静态调用或者弄成单例模式。不过反正现在这样也能用,就无所谓了。
用法:var json = new Xml2Json(xmlObject).parse(containRoot, returnText);
xmlObject可以为xml的对象或者是字符串,containRoot用来表示生成的json中要不要包含根元素,而returnText表示是以文本还是以对象形式返回json。这两个属性默认均为false。
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var Xml2Json = Class.create();
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Xml2Json.prototype = {
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initialize : function(xmlElem) {
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if (typeof(xmlElem) === 'object') {
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this.doc = xmlElem;
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} else if (typeof(xmlElem) === 'string') {
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if (window.ActiveXObject) {
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this.doc = new ActiveXObject('Microsoft.XMLDOM');
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this.doc.async = 'false';
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this.doc.loadXML(xmlElem);
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} else {
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this.doc = new DOMParser().parseFromString(xmlElem, 'text/xml');
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}
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}
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},
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parse : function(containRoot, returnText) {
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var root = this.doc.documentElement || this.doc;
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var json = this.__parse__(root, {});
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var returnValue = {};
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if (containRoot)
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returnValue[root.nodeName] = json;
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else
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returnValue = json;
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return returnText ? this.convert(returnValue) : returnValue;
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},
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convert : function(jsonObject) {
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return this.__convert__(jsonObject, 0);
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},
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__blank__ : function(s) {
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var pattern = /^[\s]*$/g;
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return pattern.test(s);
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},
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__convert__ : function(jsonObject, level) {
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var template;
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var i;
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var j;
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var tabs = '';
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for (i = 0;i < level; i++) {
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tabs += '\t';
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}
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if (jsonObject instanceof Array) {
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template = '[\n';
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for (i = 0;i < jsonObject.length - 1; i++) {
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template += tabs + '\t'
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+ this.__convert__(jsonObject[i], level + 1) + ',\n';
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}
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template += tabs
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+ '\t'
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+ this.__convert__(jsonObject[jsonObject.length - 1], level
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+ 1) + '\n' + tabs + ']';
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return template;
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} else if (typeof(jsonObject) === 'object') {
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template = '{';
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for (var property in jsonObject) {
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template += '\n\t' + tabs + property + ': '
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+ this.__convert__(jsonObject[property], level + 1)
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+ ',';
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}
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template = template.substring(0, template.length - 1);
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template += '\n' + tabs + '}';
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return template;
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} else if (typeof(jsonObject) === 'string') {
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return '"' + jsonObject + '"';
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} else {
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return jsonObject;
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}
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},
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__parse__ : function(elem, obj) {
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for (var i = 0;i < elem.attributes.length; i++) {
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var attr = elem.attributes[i];
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obj[attr.name] = attr.value;
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}
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for (i = 0;i < elem.childNodes.length; i++) {
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var child = elem.childNodes[i];
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var property = child.nodeName;
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if (child.nodeType !== Node.TEXT_NODE
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&& child.nodeType !== Node.COMMENT_NODE) {
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var childObj = this.__parse__(child, {});
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if (!obj[property])
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obj[property] = [];
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obj[property].push(childObj);
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} else if (child.nodeType === Node.TEXT_NODE
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&& !this.__blank__(child.data)) {
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obj['value'] = child.data;
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}
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}
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return this.__reduce__(obj);
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},
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__reduce__ : function(obj) {
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var count = 0;
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for (var property in obj) {
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var value = obj[property];
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if (value instanceof Array && value.length === 1) {
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obj[property] = value[0];
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}
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count++;
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}
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if (count === 1 && obj['value'])
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obj = obj['value'];
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return obj;
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}
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}
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