rezarahimi/e4x2json.js

## 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, '  '));
	// 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, ' '));