75 lines
2.3 KiB
Swift
75 lines
2.3 KiB
Swift
//
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// Pagination.swift
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// Pachyderm
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//
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// Created by Shadowfacts on 9/9/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import Foundation
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public struct Pagination: Sendable {
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public let older: RequestRange?
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public let newer: RequestRange?
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}
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extension Pagination {
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init(string: String) {
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let links = string.components(separatedBy: ",").compactMap(Item.init)
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self.older = links.first(where: { $0.kind == .next })?.range
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self.newer = links.first(where: { $0.kind == .prev })?.range
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}
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}
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extension Pagination {
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struct Item {
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let kind: Kind
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let id: String
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let limit: Int?
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var range: RequestRange {
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switch kind {
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case .next:
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return .before(id: id, count: limit)
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case .prev:
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return .after(id: id, count: limit)
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}
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}
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init?(string: String) {
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let segments = string.components(separatedBy: .whitespaces).filter { !$0.isEmpty }.joined().components(separatedBy: ";")
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let url = segments.first.flatMap { str in
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String(str[str.index(after: str.startIndex)..<str.index(before: str.endIndex)])
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}
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let rel = segments.last?.replacingOccurrences(of: "\"", with: "").trimmingCharacters(in: .whitespaces).components(separatedBy: "=")
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guard let validURL = url,
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let key = rel?.first,
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key == "rel",
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let value = rel?.last,
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let kind = Kind(rawValue: value),
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let components = URLComponents(string: validURL),
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let queryItems = components.queryItems else { return nil }
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let min = queryItems.first { $0.name == "min_id" }?.value
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let since = queryItems.first { $0.name == "since_id" }?.value
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let max = queryItems.first { $0.name == "max_id" }?.value
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guard let id = min ?? since ?? max else { return nil }
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let limit = queryItems.first { $0.name == "limit" }.flatMap { $0.value }.flatMap { Int($0) }
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self.kind = kind
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self.id = id
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self.limit = limit
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}
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}
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}
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extension Pagination.Item {
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enum Kind: String {
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case next, prev
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}
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}
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