FeedHandler.js
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var DomHandler = require("domhandler");
var DomUtils = require("domutils");
//TODO: make this a streamable handler
function FeedHandler(callback, options) {
this.init(callback, options);
}
require("inherits")(FeedHandler, DomHandler);
FeedHandler.prototype.init = DomHandler;
function getElements(what, where) {
return DomUtils.getElementsByTagName(what, where, true);
}
function getOneElement(what, where) {
return DomUtils.getElementsByTagName(what, where, true, 1)[0];
}
function fetch(what, where, recurse) {
return DomUtils.getText(
DomUtils.getElementsByTagName(what, where, recurse, 1)
).trim();
}
function addConditionally(obj, prop, what, where, recurse) {
var tmp = fetch(what, where, recurse);
if (tmp) obj[prop] = tmp;
}
var isValidFeed = function(value) {
return value === "rss" || value === "feed" || value === "rdf:RDF";
};
FeedHandler.prototype.onend = function() {
var feed = {},
feedRoot = getOneElement(isValidFeed, this.dom),
tmp,
childs;
if (feedRoot) {
if (feedRoot.name === "feed") {
childs = feedRoot.children;
feed.type = "atom";
addConditionally(feed, "id", "id", childs);
addConditionally(feed, "title", "title", childs);
if (
(tmp = getOneElement("link", childs)) &&
(tmp = tmp.attribs) &&
(tmp = tmp.href)
)
feed.link = tmp;
addConditionally(feed, "description", "subtitle", childs);
if ((tmp = fetch("updated", childs))) feed.updated = new Date(tmp);
addConditionally(feed, "author", "email", childs, true);
feed.items = getElements("entry", childs).map(function(item) {
var entry = {},
tmp;
item = item.children;
addConditionally(entry, "id", "id", item);
addConditionally(entry, "title", "title", item);
if (
(tmp = getOneElement("link", item)) &&
(tmp = tmp.attribs) &&
(tmp = tmp.href)
)
entry.link = tmp;
if ((tmp = fetch("summary", item) || fetch("content", item)))
entry.description = tmp;
if ((tmp = fetch("updated", item)))
entry.pubDate = new Date(tmp);
return entry;
});
} else {
childs = getOneElement("channel", feedRoot.children).children;
feed.type = feedRoot.name.substr(0, 3);
feed.id = "";
addConditionally(feed, "title", "title", childs);
addConditionally(feed, "link", "link", childs);
addConditionally(feed, "description", "description", childs);
if ((tmp = fetch("lastBuildDate", childs)))
feed.updated = new Date(tmp);
addConditionally(feed, "author", "managingEditor", childs, true);
feed.items = getElements("item", feedRoot.children).map(function(
item
) {
var entry = {},
tmp;
item = item.children;
addConditionally(entry, "id", "guid", item);
addConditionally(entry, "title", "title", item);
addConditionally(entry, "link", "link", item);
addConditionally(entry, "description", "description", item);
if ((tmp = fetch("pubDate", item)))
entry.pubDate = new Date(tmp);
return entry;
});
}
}
this.dom = feed;
DomHandler.prototype._handleCallback.call(
this,
feedRoot ? null : Error("couldn't find root of feed")
);
};
module.exports = FeedHandler;