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Viewing File: feeds.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getFeed = void 0;
var stringify_1 = require("./stringify");
var legacy_1 = require("./legacy");
/**
 * Get the feed object from the root of a DOM tree.
 *
 * @param doc - The DOM to to extract the feed from.
 * @returns The feed.
 */
function getFeed(doc) {
    var feedRoot = getOneElement(isValidFeed, doc);
    return !feedRoot
        ? null
        : feedRoot.name === "feed"
            ? getAtomFeed(feedRoot)
            : getRssFeed(feedRoot);
}
exports.getFeed = getFeed;
/**
 * Parse an Atom feed.
 *
 * @param feedRoot The root of the feed.
 * @returns The parsed feed.
 */
function getAtomFeed(feedRoot) {
    var _a;
    var childs = feedRoot.children;
    var feed = {
        type: "atom",
        items: (0, legacy_1.getElementsByTagName)("entry", childs).map(function (item) {
            var _a;
            var children = item.children;
            var entry = { media: getMediaElements(children) };
            addConditionally(entry, "id", "id", children);
            addConditionally(entry, "title", "title", children);
            var href = (_a = getOneElement("link", children)) === null || _a === void 0 ? void 0 : _a.attribs.href;
            if (href) {
                entry.link = href;
            }
            var description = fetch("summary", children) || fetch("content", children);
            if (description) {
                entry.description = description;
            }
            var pubDate = fetch("updated", children);
            if (pubDate) {
                entry.pubDate = new Date(pubDate);
            }
            return entry;
        }),
    };
    addConditionally(feed, "id", "id", childs);
    addConditionally(feed, "title", "title", childs);
    var href = (_a = getOneElement("link", childs)) === null || _a === void 0 ? void 0 : _a.attribs.href;
    if (href) {
        feed.link = href;
    }
    addConditionally(feed, "description", "subtitle", childs);
    var 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;
    var childs = (_b = (_a = getOneElement("channel", feedRoot.children)) === null || _a === void 0 ? void 0 : _a.children) !== null && _b !== void 0 ? _b : [];
    var feed = {
        type: feedRoot.name.substr(0, 3),
        id: "",
        items: (0, legacy_1.getElementsByTagName)("item", feedRoot.children).map(function (item) {
            var children = item.children;
            var entry = { media: getMediaElements(children) };
            addConditionally(entry, "id", "guid", children);
            addConditionally(entry, "title", "title", children);
            addConditionally(entry, "link", "link", children);
            addConditionally(entry, "description", "description", children);
            var 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);
    var updated = fetch("lastBuildDate", childs);
    if (updated) {
        feed.updated = new Date(updated);
    }
    addConditionally(feed, "author", "managingEditor", childs, true);
    return feed;
}
var MEDIA_KEYS_STRING = ["url", "type", "lang"];
var 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 (0, legacy_1.getElementsByTagName)("media:content", where).map(function (elem) {
        var attribs = elem.attribs;
        var media = {
            medium: attribs.medium,
            isDefault: !!attribs.isDefault,
        };
        for (var _i = 0, MEDIA_KEYS_STRING_1 = MEDIA_KEYS_STRING; _i < MEDIA_KEYS_STRING_1.length; _i++) {
            var attrib = MEDIA_KEYS_STRING_1[_i];
            if (attribs[attrib]) {
                media[attrib] = attribs[attrib];
            }
        }
        for (var _a = 0, MEDIA_KEYS_INT_1 = MEDIA_KEYS_INT; _a < MEDIA_KEYS_INT_1.length; _a++) {
            var attrib = MEDIA_KEYS_INT_1[_a];
            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 (0, legacy_1.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) {
    if (recurse === void 0) { recurse = false; }
    return (0, stringify_1.textContent)((0, legacy_1.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) {
    if (recurse === void 0) { recurse = false; }
    var 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";
}
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