import { textContent } from "./stringify.js"; import { getElementsByTagName } from "./legacy.js"; /** * Get the feed object from the root of a DOM tree. * * @category Feeds * @param doc - The DOM to to extract the feed from. * @returns The feed. */ export function getFeed(doc) { const feedRoot = getOneElement(isValidFeed, doc); return !feedRoot ? null : feedRoot.name === "feed" ? getAtomFeed(feedRoot) : getRssFeed(feedRoot); } /** * Parse an Atom feed. * * @param feedRoot The root of the feed. * @returns The parsed feed. */ function getAtomFeed(feedRoot) { var _a; const childs = feedRoot.children; const feed = { type: "atom", items: getElementsByTagName("entry", childs).map((item) => { var _a; const { children } = item; const entry = { media: getMediaElements(children) }; addConditionally(entry, "id", "id", children); addConditionally(entry, "title", "title", children); const href = (_a = getOneElement("link", children)) === null || _a === void 0 ? void 0 : _a.attribs["href"]; if (href) { entry.link = href; } const description = fetch("summary", children) || fetch("content", children); if (description) { entry.description = description; } const pubDate = fetch("updated", children); if (pubDate) { entry.pubDate = new Date(pubDate); } return entry; }), }; addConditionally(feed, "id", "id", childs); addConditionally(feed, "title", "title", childs); const href = (_a = getOneElement("link", childs)) === null || _a === void 0 ? void 0 : _a.attribs["href"]; if (href) { feed.link = href; } addConditionally(feed, "description", "subtitle", childs); const updated = fetch("updated", childs); if (updated) { feed.updated = new Date(updated); } addConditionally(feed, "author", "email", childs, true); return feed; } /** * Parse a RSS feed. * * @param feedRoot The root of the feed. * @returns The parsed feed. */ function getRssFeed(feedRoot) { var _a, _b; const childs = (_b = (_a = getOneElement("channel", feedRoot.children)) === null || _a === void 0 ? void 0 : _a.children) !== null && _b !== void 0 ? _b : []; const feed = { type: feedRoot.name.substr(0, 3), id: "", items: getElementsByTagName("item", feedRoot.children).map((item) => { const { children } = item; const entry = { media: getMediaElements(children) }; addConditionally(entry, "id", "guid", children); addConditionally(entry, "title", "title", children); addConditionally(entry, "link", "link", children); addConditionally(entry, "description", "description", children); const pubDate = fetch("pubDate", children); if (pubDate) entry.pubDate = new Date(pubDate); return entry; }), }; addConditionally(feed, "title", "title", childs); addConditionally(feed, "link", "link", childs); addConditionally(feed, "description", "description", childs); const updated = fetch("lastBuildDate", childs); if (updated) { feed.updated = new Date(updated); } addConditionally(feed, "author", "managingEditor", childs, true); return feed; } const MEDIA_KEYS_STRING = ["url", "type", "lang"]; const MEDIA_KEYS_INT = [ "fileSize", "bitrate", "framerate", "samplingrate", "channels", "duration", "height", "width", ]; /** * Get all media elements of a feed item. * * @param where Nodes to search in. * @returns Media elements. */ function getMediaElements(where) { return getElementsByTagName("media:content", where).map((elem) => { const { attribs } = elem; const media = { medium: attribs["medium"], isDefault: !!attribs["isDefault"], }; for (const attrib of MEDIA_KEYS_STRING) { if (attribs[attrib]) { media[attrib] = attribs[attrib]; } } for (const attrib of MEDIA_KEYS_INT) { if (attribs[attrib]) { media[attrib] = parseInt(attribs[attrib], 10); } } if (attribs["expression"]) { media.expression = attribs["expression"]; } return media; }); } /** * Get one element by tag name. * * @param tagName Tag name to look for * @param node Node to search in * @returns The element or null */ function getOneElement(tagName, node) { return getElementsByTagName(tagName, node, true, 1)[0]; } /** * Get the text content of an element with a certain tag name. * * @param tagName Tag name to look for. * @param where Node to search in. * @param recurse Whether to recurse into child nodes. * @returns The text content of the element. */ function fetch(tagName, where, recurse = false) { return textContent(getElementsByTagName(tagName, where, recurse, 1)).trim(); } /** * Adds a property to an object if it has a value. * * @param obj Object to be extended * @param prop Property name * @param tagName Tag name that contains the conditionally added property * @param where Element to search for the property * @param recurse Whether to recurse into child nodes. */ function addConditionally(obj, prop, tagName, where, recurse = false) { const val = fetch(tagName, where, recurse); if (val) obj[prop] = val; } /** * Checks if an element is a feed root node. * * @param value The name of the element to check. * @returns Whether an element is a feed root node. */ function isValidFeed(value) { return value === "rss" || value === "feed" || value === "rdf:RDF"; } //# sourceMappingURL=feeds.js.map