77 lines
1.6 KiB
Swift
77 lines
1.6 KiB
Swift
//
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// FeedParser.swift
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// RSParser
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//
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// Created by Brent Simmons on 6/20/17.
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// Copyright © 2017 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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// FeedParser handles RSS, Atom, JSON Feed, and RSS-in-JSON.
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// You don’t need to know the type of feed.
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public typealias FeedParserCallback = (_ parsedFeed: ParsedFeed?, _ error: Error?) -> Void
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public struct FeedParser {
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public static func canParse(_ parserData: ParserData) -> Bool {
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let type = feedType(parserData)
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switch type {
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case .jsonFeed, .rssInJSON, .rss, .atom:
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return true
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default:
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return false
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}
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}
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public static func parse(_ parserData: ParserData) throws -> ParsedFeed? {
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// This is generally fast enough to call on the main thread —
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// but it’s probably a good idea to use a background queue if
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// you might be doing a lot of parsing. (Such as in a feed reader.)
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do {
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let type = feedType(parserData)
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switch type {
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case .jsonFeed:
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return try JSONFeedParser.parse(parserData)
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case .rssInJSON:
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return try RSSInJSONParser.parse(parserData)
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case .rss:
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return RSSParser.parse(parserData)
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case .atom:
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return AtomParser.parse(parserData)
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case .unknown, .notAFeed:
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return nil
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}
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}
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catch { throw error }
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}
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public static func parse(_ parserData: ParserData, _ callback: @escaping FeedParserCallback) {
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DispatchQueue.global(qos: .background).async {
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do {
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let parsedFeed = try parse(parserData)
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DispatchQueue.main.async {
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callback(parsedFeed, nil)
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}
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}
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catch {
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DispatchQueue.main.async {
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callback(nil, error)
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}
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}
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}
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}
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}
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