JDistiller, A DSL for web-crawling built on Node.js and jQuery

A couple weeks ago I posted a web-crawler I'd built for parsing Wikipedia articles (http://news.ycombinator.com/item?id=4436349). jDistiller grew out of this project. As a test I rebuilt the crawler in thirty lines of code using the jDistiller API:

new jDistiller() .set('title', '#firstHeading') .set('links', '#bodyContent p a', function(element, prev) { var href = element.attr('href'), key = href.replace('/wiki/', '');

		if ( key === href) return;
		
		element.replaceWith('[[' + key + ']]');
		
		return [key, {
			title: element.attr('title'),
			text: prev[key] ? prev[key].text : element.text(),
			occurrences: prev[key] ? prev[key].occurrences + 1 : 1
		}]
	})
	.set('sections', '#bodyContent p,#firstHeading,h2,h3,img', function(element, prev) {
		var images = [];
		
		if ( element.is('h1') || element.is('h2') ) {
			this.heading = element.text().trim();
			return
		}
		
		return [this.heading, {
			text: prev[this.heading] ? prev[this.heading].text + element.text() : element.text(),
			images: element.is('img') && element.attr('width') > 50 ? [element.attr('src').replace('//', 'http://')] : []
		}];
	})
	.distill('http://en.wikipedia.org/wiki/Dog', function(err, distilledPage) {
		console.log(JSON.stringify(distilledPage.sections));
	});