Implement DOMParser and XMLSerializer classes

All modern browsers expose these two useful classes with both a very simple API:

https://developer.mozilla.org/en/docs/Web/API/DOMParser https://developer.mozilla.org/en/docs/XMLSerializer

Without knowing the details, I believe it shouldn’t be too hard to implement these as thin shim to what jsdom already has available.

I am currently using quickly hacked together shims in paper.js that look like the code below.

I am happy to work on a better version that can find its way into jsdom, if you think this would be useful and could give me some pointers as to where to start looking.

function XMLSerializer() {
}

XMLSerializer.prototype.serializeToString = function(node) {
    var text = jsdom.serializeDocument(node);
    // Fix a jsdom issue where all SVG tagNames are lowercased:
    // https://github.com/tmpvar/jsdom/issues/620
    var tagNames = ['linearGradient', 'radialGradient', 'clipPath', 'textPath'];
    for (var i = 0, l = tagNames.length; i < l; i++) {
        var tagName = tagNames[i];
        text = text.replace(
            new RegExp('(<|</)' + tagName.toLowerCase() + '\\b', 'g'),
            function(all, start) {
                return start + tagName;
            });
    }
    return text;
};

function DOMParser() {
}

DOMParser.prototype.parseFromString = function(string, contenType) {
    var div = document.createElement('div');
    div.innerHTML = string;
    return div.firstChild;
};

[teclone]

@domenic, @tommedema, @ianks, @lehni. There is a complete javascript xml-serializer that i created and is avaliable as an npm package. It follows the w3c spec and even added some improvements. its serialization is neat and accurate with 99% test coverage.

[domenic]

So DOMParser is now implemented and will be in the next release.

I’ve looked at a bunch of XML serializers on npm and nobody seems to have put together one that matches the spec. In the meantime https://github.com/cburgmer/xmlserializer seems closest, so we could use that I guess. I opened https://github.com/cburgmer/xmlserializer/issues/8 to get more spec compliance.