62 lines
1.8 KiB
Swift
62 lines
1.8 KiB
Swift
//
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// ArticleSorter.swift
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// NetNewsWire
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//
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// Created by Phil Viso on 9/8/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import Articles
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import Foundation
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protocol SortableArticle {
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var sortableName: String { get }
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var sortableDate: Date { get }
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var sortableArticleID: String { get }
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var sortableWebFeedID: String { get }
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}
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struct ArticleSorter {
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static func sortedByDate<T: SortableArticle>(articles: [T],
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sortDirection: ComparisonResult,
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groupByFeed: Bool) -> [T] {
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if groupByFeed {
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return sortedByFeedName(articles: articles, sortByDateDirection: sortDirection)
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} else {
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return sortedByDate(articles: articles, sortDirection: sortDirection)
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}
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}
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// MARK: -
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private static func sortedByFeedName<T: SortableArticle>(articles: [T],
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sortByDateDirection: ComparisonResult) -> [T] {
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// Group articles by "feed-feedID" - feed ID is used to differentiate between
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// two feeds that have the same name
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let groupedArticles = Dictionary(grouping: articles) { "\($0.sortableName.lowercased())-\($0.sortableWebFeedID)" }
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return groupedArticles
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.sorted { $0.key < $1.key }
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.flatMap { (tuple) -> [T] in
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let (_, articles) = tuple
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return sortedByDate(articles: articles, sortDirection: sortByDateDirection)
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}
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}
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private static func sortedByDate<T: SortableArticle>(articles: [T],
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sortDirection: ComparisonResult) -> [T] {
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return articles.sorted { (article1, article2) -> Bool in
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if article1.sortableDate == article2.sortableDate {
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return article1.sortableArticleID < article2.sortableArticleID
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}
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if sortDirection == .orderedDescending {
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return article1.sortableDate > article2.sortableDate
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}
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return article1.sortableDate < article2.sortableDate
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}
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}
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}
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