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olegp/e4x2json.js

Created October 23, 2010 20:36
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one way converter from E4X XML to JSON
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e4x2json.js
// One way converter from E4X XML to JSON
// 1) turns <body><item>1</item><item>2</item></body> into
// body: {item: ["1", "2"]} so that lists are easier to work with
// 2) turns things like: <body a="a">whatever</body> into
// body: {_a: "a", _: "whatever"}
// however <body>whatever</body> becomes simply body: "whatever
// - attributes specified by ignored are ignored
function E4XtoJSON(xml, ignored) {
var r, children = xml.*, attributes = xml.@*, length = children.length();
if(length == 0) {
r = xml.toString();
} else if(length == 1) {
var text = xml.text().toString();
if(text) {
r = text;
}
}
if(r == undefined) {
r = {};
for each (var child in children) {
var name = child.localName();
var json = E4XtoJSON(child, ignored);
var value = r[name];
if(value) {
if(value.length) {
value.push(json);
} else {
r[name] = [value, json]
}
} else {
r[name] = json;
}
}
}
if(attributes.length()) {
var a = {}, c = 0;
for each (var attribute in attributes) {
var name = attribute.localName();
if(ignored && ignored.indexOf(name) == -1) {
a["_" + name] = attribute.toString();
c ++;
}
}
if(c) {
if(r) a._ = r;
return a;
}
}
return r;
}
// test, requires ringo/ringojs and chl/wraps-tagsoup
var tagsoup = require("wraps/tagsoup");
var data = tagsoup.parse("http://groups.google.com/group/ringojs/feed/atom_v1_0_msgs.xml");
print(JSON.stringify(E4XtoJSON(data, ["type", "space", "xmlns", "html"]), null, ' '));
@zhengdongyang
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zhengdongyang commented Sep 16, 2020 •
edited
Loading

反向处理
function JsonToE4X (json, txml,ignored) {
var data ,xmllist;
if(json instanceof Array){
xmllist = new XMLList('<></>');
for (var j = 0;j < json.length; j++) {
xmllist += JsonToE4X (json[j],txml.copy(),ignored)
}
}else{
data = json;
}
if(txml == undefined) txml = new XML('');
for(var key in data){
if(ignored&&ignored.indexOf(key)!=-1)continue;
if ( data[key] instanceof Array) {
for (var i = 0;i < data[key].length; i++) {
if(data[key][i] instanceof Object){
txml.appendChild(<{key}/>);
JsonToE4X( data[key][i], txml[key][i],ignored);
}else{
txml.appendChild(<{key}>{data[key][i]}</{key}>);
}
}
}else if(data[key]instanceof Object){
if(key == ''){
JsonToE4X(data[key], txml,ignored);
}else{
//txml[key]='';
txml.appendChild(<{key}/>);
JsonToE4X(data[key],txml[key],ignored);
}
}else {
if(typeof(key)=='string'&& key.indexOf('')==0){
var attrib="@"+key.substr(1);
txml[attrib]=data[key];
}else{
txml.appendChild(<{key}/>);
txml[key]=data[key];
}
}
}
return xmllist != undefined?xmllist:txml;;
}

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