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Viewing / Editing File: FeedHandler.js

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
    result["default"] = mod;
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
var domhandler_1 = __importDefault(require("domhandler"));
var DomUtils = __importStar(require("domutils"));
var Parser_1 = require("./Parser");
//TODO: Consume data as it is coming in
var FeedHandler = /** @class */ (function (_super) {
    __extends(FeedHandler, _super);
    /**
     *
     * @param callback
     * @param options
     */
    function FeedHandler(callback, options) {
        var _this = this;
        if (typeof callback === "object" && callback !== null) {
            callback = undefined;
            options = callback;
        }
        _this = _super.call(this, callback, options) || this;
        return _this;
    }
    FeedHandler.prototype.onend = function () {
        var feed = {};
        var feedRoot = getOneElement(isValidFeed, this.dom);
        if (feedRoot) {
            if (feedRoot.name === "feed") {
                var childs = feedRoot.children;
                feed.type = "atom";
                addConditionally(feed, "id", "id", childs);
                addConditionally(feed, "title", "title", childs);
                var href = getAttribute("href", getOneElement("link", childs));
                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);
                feed.items = getElements("entry", childs).map(function (item) {
                    var entry = {};
                    var children = item.children;
                    addConditionally(entry, "id", "id", children);
                    addConditionally(entry, "title", "title", children);
                    var href = getAttribute("href", getOneElement("link", children));
                    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;
                });
            }
            else {
                var 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);
                var updated = fetch("lastBuildDate", childs);
                if (updated) {
                    feed.updated = new Date(updated);
                }
                addConditionally(feed, "author", "managingEditor", childs, true);
                feed.items = getElements("item", feedRoot.children).map(function (item) {
                    var entry = {};
                    var children = item.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;
                });
            }
        }
        this.feed = feed;
        this.handleCallback(feedRoot ? null : Error("couldn't find root of feed"));
    };
    return FeedHandler;
}(domhandler_1.default));
exports.FeedHandler = FeedHandler;
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) {
    if (recurse === void 0) { recurse = false; }
    return DomUtils.getText(DomUtils.getElementsByTagName(what, where, recurse, 1)).trim();
}
function getAttribute(name, elem) {
    if (!elem) {
        return null;
    }
    var attribs = elem.attribs;
    return attribs[name];
}
function addConditionally(obj, prop, what, where, recurse) {
    if (recurse === void 0) { recurse = false; }
    var tmp = fetch(what, where, recurse);
    // @ts-ignore
    if (tmp)
        obj[prop] = tmp;
}
function isValidFeed(value) {
    return value === "rss" || value === "feed" || value === "rdf:RDF";
}
var defaultOptions = { xmlMode: true };
/**
 * Parse a feed.
 *
 * @param feed The feed that should be parsed, as a string.
 * @param options Optionally, options for parsing. When using this option, you probably want to set `xmlMode` to `true`.
 */
function parseFeed(feed, options) {
    if (options === void 0) { options = defaultOptions; }
    var handler = new FeedHandler(options);
    new Parser_1.Parser(handler, options).end(feed);
    return handler.feed;
}
exports.parseFeed = parseFeed;

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