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