Saturday, July 27, 2013

Dart in the ICE Code Editor

During a brief exchange with Seth Ladd, he suggested that the ICE Code Editor might be able to perform Dart coding similar to I am not quite convinced that the additional compile time would make for a satisfactory experience (there is already a 2 second delay between the end of typing and an auto-update). But, it an intriguing enough idea that I am going to explore it.

First up, can I edit and run Dart code in ICE with the Dartium browser? Yes I can:

As an aside I would really like to suppress those Application Cache messages. They are really, really annoying. Anyhow…

I am going to get those editor warnings since the JavaScript syntax highlighter is in action. I will have to live with them for a bit. Next I add another warning by importing the dart:html library and doing something simple with it:
<script src="/ice/packages/browser/dart.js"></script>
<script type="application/dart">
import 'dart:html';
main() {
  print("Yay Dart!!!");
    ..append(new Element.html('<h1>Howdy Space Cowboy!</h1>')) = '250px';
That works as well. The <h1> element is successfully appended to the preview frame behind the code:

I have no reason to think that Three.dart would not work in there as well.

At this point, I am sufficiently satisfied that I am ready to dive into a implementation for non-Dart browsers (i.e. all of them). This is likely a multi-night exploration, but I need to start somewhere. That somewhere is to pull in the compiled JavaScript that currently uses:
<!-- ... -->
<script src=""></script>
Unsurprisingly, that does not work, failing while trying to call appendChild() on null. In other words, that leap.dart.js expects the page in which it is embedded to contain a DOM structure nearly identical to that of

So I spend some time digging through the leap.dart code used on Happily, it looks like I will not need large sections of it (parsing syntax highlighting and communicating with iframes) as ICE already does that. I will need to be able to extract the Dart code between <script> tags, so I will pick up there tomorrow and see if I can pull enough of leap.dart into my own library to get it working on a local copy of ICE.

This should be fun, mostly because I have a built-in excuse to dig through someone else's code for a few days. I love reading other people's code!

Day #825

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