Fórum do Swift

forum_swift_evolution.swift

//: Playground - noun: a place where people can play

import Foundation
import PlaygroundSupport

struct Post {
    let id: Int
    let body: String
    let username: String
    let name: String

    init(dict: Dictionary<String,AnyObject>) {
        self.body = dict["cooked"] as! String
        self.name = dict["name"] as! String
        self.username = dict["username"] as! String
        self.id = dict["id"] as! Int
    }
}

var isFinalPage = false
let url = "https://forums.swift.org/t/se-0207-add-a-containsonly-algorithm-to-sequence/11686[PAGE].json"
var postcount = 0
var dataRequest: URLSessionDataTask?
var posts = [Post]()
var titleForum: String?

func generateURL() -> String {
    print("url generate")
    if posts.count > 0 {
        return url.replacingOccurrences(of: "[PAGE]", with: "/\(posts.count)")
    }
    return url.replacingOccurrences(of: "[PAGE]", with: "")
}

func loadPage() {
    print("load page")
    guard !isFinalPage else { return }
    guard let url = URL(string: generateURL()) else { print("NO URL") ; return }
    dataRequest = URLSession.shared.dataTask(with: url, completionHandler: { (data, response, error) in
        guard let dataJSON = data else { print("NO DATA") ; isFinalPage = true ; return }
        guard let jsonDict = try? JSONSerialization.jsonObject(with: dataJSON, options: []) as? [String: AnyObject] else { print("NO JSON"); isFinalPage = true ; return }
        guard let json = jsonDict else {  isFinalPage = true ; return }
        guard let postsDict = json["post_stream"]?["posts"] as? [Dictionary<String,AnyObject>] else {  isFinalPage = true ; return }
        postcount = json["posts_count"] as? Int ?? 0
        titleForum = json["title"] as? String ?? ""
        posts.append(contentsOf: postsDict.map({ Post(dict: $0) }))
        finishLoadind()
    })
    dataRequest?.resume()
}

func finishLoadind() {
    if posts.count < postcount {
        loadPage()
    } else {
        isFinalPage = true
        print(titleForum ?? "")
        print(posts)
    }
}

PlaygroundPage.current.needsIndefiniteExecution = true
print("start")
loadPage()