Experimenting with simplest ways to deal with XMPP streams over websockets, in JS.

gistfile1.js

var MAGIC_START_TOKEN = "<stream:stream ";
var ALT_MAGIC_START_TOKEN = "<stream ";
var MAGIC_END_TOKEN = "</stream:stream>";
var ALT_MAGIC_END_TOKEN = "</stream>";
var STREAM_START_TAG, STREAM_END_TAG;

if (frame == MAGIC_END_TOKEN || frame == ALT_MAGIC_END_TOKEN) {
    onStreamEnd();
} else {
    var doc;
    if (!STREAM_START_TAG) {
        if (frame.startsWith(MAGIC_START_TOKEN) || frame.startsWith(ALT_MAGIC_START_TOKEN) {
            STREAM_START_TAG = frame;
            STREAM_END_TAG = frame.startsWith(MAGIC_START_TOKEN) ? MAGIC_END_TOKEN : ALT_MAGIC_END_TOKEN;   
            doc = parseXml(frame + STREAM_END_TAG);
            if (!checkStreamNS(doc)) {
                onNSError();
            }   
            onStreamStart( doc );
        } else {
            onPrefixError();
        }   
    } else {
        doc = parseXml(STREAM_START_TAG + frame + STREAM_END_TAG);
    }   
    var stream = doc.documentElement;
    for (var child = stream.firstChild; child != null; child = child.nextSibling) {
        onElement(child);
    }   
}