[JavaScript] Extract feed urls from HTML document

feedfinder.js

function findFeeds() {
	var FEED_CONTENT_TYPES = {
		"application/rss+xml": 1,
		"application/atom+xml": 1,
		"application/rdf+xml": 1,
		"text/xml": 1,
		"application/x.atom+xml": 1,
		"application/x-atom+xml": 1
	};
	
	function each(a, c) {
		for (var i = 0, l = a.length; i < l; i++) {
			c(a[i]);
		}
	}
	
	function parse(doc) {
		var feeds = [];
		
		each(doc.getElementsByTagName('head'), function (head) {
			each(head.getElementsByTagName('link'), function (link) {
				if (link.rel === 'alternate' && FEED_CONTENT_TYPES[link.type] && link.href) {
					feeds.push({
						href: link.href,
						title: link.title
					});
				}
			})
		});
		
		return feeds;
	}
	
	return parse(document);
}