120 lines
2.8 KiB
Swift
120 lines
2.8 KiB
Swift
//
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// ArticleStringFormatter.swift
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// NetNewsWire
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//
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// Created by Brent Simmons on 8/31/15.
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// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import Articles
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import RSParser
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struct ArticleStringFormatter {
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private static var feedNameCache = [String: String]()
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private static var titleCache = [String: String]()
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private static var summaryCache = [String: String]()
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private static let dateFormatter: DateFormatter = {
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let formatter = DateFormatter()
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formatter.dateStyle = .medium
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formatter.timeStyle = .none
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return formatter
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}()
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private static let timeFormatter: DateFormatter = {
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let formatter = DateFormatter()
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formatter.dateStyle = .none
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formatter.timeStyle = .short
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return formatter
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}()
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static func emptyCaches() {
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feedNameCache = [String: String]()
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titleCache = [String: String]()
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summaryCache = [String: String]()
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}
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static func truncatedFeedName(_ feedName: String) -> String {
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if let cachedFeedName = feedNameCache[feedName] {
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return cachedFeedName
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}
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let maxFeedNameLength = 100
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if feedName.count < maxFeedNameLength {
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feedNameCache[feedName] = feedName
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return feedName
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}
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let s = (feedName as NSString).substring(to: maxFeedNameLength)
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feedNameCache[feedName] = s
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return s
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}
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static func truncatedTitle(_ article: Article, forHTML: Bool = false) -> String {
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guard let title = article.sanitizedTitle(forHTML: forHTML) else {
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return ""
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}
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if let cachedTitle = titleCache[title] {
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return cachedTitle
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}
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var s = title.replacingOccurrences(of: "\n", with: "")
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s = s.replacingOccurrences(of: "\r", with: "")
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s = s.replacingOccurrences(of: "\t", with: "")
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if !forHTML {
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s = s.rsparser_stringByDecodingHTMLEntities()
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}
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s = s.trimmingWhitespace
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s = s.collapsingWhitespace
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let maxLength = 1000
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if s.count < maxLength {
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titleCache[title] = s
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return s
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}
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s = (s as NSString).substring(to: maxLength)
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titleCache[title] = s
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return s
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}
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static func attributedTruncatedTitle(_ article: Article) -> NSAttributedString {
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let title = truncatedTitle(article, forHTML: true)
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let attributed = NSAttributedString(html: title)
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return attributed
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}
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static func truncatedSummary(_ article: Article) -> String {
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guard let body = article.body else {
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return ""
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}
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let key = article.articleID + article.accountID
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if let cachedBody = summaryCache[key] {
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return cachedBody
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}
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var s = body.rsparser_stringByDecodingHTMLEntities()
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s = s.strippingHTML(maxCharacters: 250)
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s = s.trimmingWhitespace
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s = s.collapsingWhitespace
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if s == "Comments" { // Hacker News.
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s = ""
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}
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summaryCache[key] = s
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return s
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}
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static func dateString(_ date: Date) -> String {
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if Calendar.dateIsToday(date) {
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return timeFormatter.string(from: date)
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}
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return dateFormatter.string(from: date)
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}
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}
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