NetNewsWire/Shared/Timeline/TimelineStringFormatter.swift

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//
// TimelineStringFormatter.swift
// NetNewsWire
//
// Created by Brent Simmons on 8/31/15.
// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import Articles
import RSParser
struct TimelineStringFormatter {
private static var feedNameCache = [String: String]()
private static var titleCache = [String: String]()
private static var summaryCache = [String: String]()
private static let dateFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .medium
formatter.timeStyle = .none
return formatter
}()
private static let timeFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .none
formatter.timeStyle = .short
return formatter
}()
static func emptyCaches() {
feedNameCache = [String: String]()
titleCache = [String: String]()
summaryCache = [String: String]()
}
static func truncatedFeedName(_ feedName: String) -> String {
if let cachedFeedName = feedNameCache[feedName] {
return cachedFeedName
}
let maxFeedNameLength = 100
if feedName.count < maxFeedNameLength {
feedNameCache[feedName] = feedName
return feedName
}
let s = (feedName as NSString).substring(to: maxFeedNameLength)
feedNameCache[feedName] = s
return s
}
static func truncatedTitle(_ article: Article) -> String {
guard let title = article.title else {
return ""
}
if let cachedTitle = titleCache[title] {
return cachedTitle
}
var s = title.replacingOccurrences(of: "\n", with: "")
s = s.replacingOccurrences(of: "\r", with: "")
s = s.replacingOccurrences(of: "\t", with: "")
s = s.rsparser_stringByDecodingHTMLEntities()
s = s.replacingOccurrences(of: "", with: "")
s = s.rs_stringByTrimmingWhitespace()
s = s.rs_stringWithCollapsedWhitespace()
let maxLength = 1000
if s.count < maxLength {
titleCache[title] = s
return s
}
s = (s as NSString).substring(to: maxLength)
titleCache[title] = s
return s
}
static func truncatedSummary(_ article: Article) -> String {
guard let body = article.body else {
return ""
}
if let cachedBody = summaryCache[body] {
return cachedBody
}
var s = body.rsparser_stringByDecodingHTMLEntities()
s = s.rs_string(byStrippingHTML: 300)
s = s.rs_stringByTrimmingWhitespace()
s = s.rs_stringWithCollapsedWhitespace()
if s == "Comments" { // Hacker News.
s = ""
}
summaryCache[body] = s
return s
}
static func dateString(_ date: Date) -> String {
if NSCalendar.rs_dateIsToday(date) {
return timeFormatter.string(from: date)
}
return dateFormatter.string(from: date)
}
}