what is the right scenario when dealing with conditions ?

[thdlx]

Hi, i've a common scenario with PromiseKit but I'm unable to figure out the best approach.
I want to retrieve some data from a website, but those data are dispatched on several pages. In some case there's only 1 page but it maybe 2, 3, 4, ... pages.

My code is below :

firstly {
	webRequest().get(url: "www.somewebsite.com/list")
}
.compactMap { htmlData in
	parseData(htmlData)  //returns tuple: items and boolean = true if there is a next page button
}
.map { (items, nextPage) in
	print(items)

	// ??
	if nextPage { ... } // How can I handle the possibility to iterate through all next pages, if no next page then stop ??    
}
.catch { error in
	print( error.localizedDescription )
}

Is there someone able to give me a solution to solve this problem ?

[mxcl]

func get(page: Int? = 0) -> Promise<SomeResponse> {
    //…
}

func getAll() -> Promise<[Page]> {
     return get().then { rsp -> Promise<[Page]> in
         if rsp.hasAnotherPage {
             return get(page: nextPage).map {
                 rsp.pages + $0.pages
             }
         } else {
               return results
         }
     }
}

[thdlx]

So cool !
I'll try that tomorrow...
Thanks a lot
Thierry

[thdlx]

I'have made some tests with your your code, and if I've understand it well (I've switched from ObjectiveC to Swift recently). Thats work only if there's 1 or 2 pages but not if there's more pages.

func get(page: Int? = 0) -> Promise<(page: Data,hasAnotherPage: Bool)>  {
    return Promise { seal in
        firstly {
            webRequest().getHtmlData(url: "http://www.google.com")
        }
        .map { html in
            print("************ Page: \(String(page ?? 0))")
            if page ?? 0 <= 3 { seal.fulfill((html, true)) }
            else { seal.fulfill((html,false)) }
            
        }
        .catch { error in
            seal.reject(error)
        }
    }
}
func getAll() -> Promise<Data> {
    var nextPage = 0
    return get().then { rsp -> Promise<Data> in
        if rsp.hasAnotherPage {
            nextPage+=1
            return self.get(page: nextPage).map {
                rsp.page + $0.page
            }
        }
        else {
            return Promise { seal in
                seal.fulfill(rsp.page)
            }
        }
    }
    
}

Maybe I'm wrong...

[mxcl]

private func fetch(page: Int) -> Promise<SomeResponse> {
    //…
}

func get(page: Int = 0) -> Promise<[Page]> {
     return fetch(page: page).then { rsp in
         if rsp.hasAnotherPage {
             return get(page: page + 1).map {
                 rsp.pages + $0.pages
             }
         } else {
               return Promise(value: rsp.results)
         }
     }
}