166 lines
3.6 KiB
Swift
166 lines
3.6 KiB
Swift
//
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// TimelineStringUtilities.swift
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// Evergreen
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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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// TODO: Don’t make all this at top level.
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private var truncatedFeedNameCache = [String: String]()
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private let truncatedTitleCache = NSMutableDictionary()
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private let normalizedTextCache = NSMutableDictionary()
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private let textCache = NSMutableDictionary()
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private let summaryCache = NSMutableDictionary()
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func timelineEmptyCaches() {
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truncatedFeedNameCache = [String: String]()
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truncatedTitleCache.removeAllObjects()
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normalizedTextCache.removeAllObjects()
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textCache.removeAllObjects()
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summaryCache.removeAllObjects()
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}
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func timelineTruncatedFeedName(_ feedName: String) -> String {
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if let cachedFeedName = truncatedFeedNameCache[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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truncatedFeedNameCache[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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truncatedFeedNameCache[feedName] = s
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return s
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}
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func timelineTruncatedTitle(_ article: Article) -> String {
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guard let title = article.title else {
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return ""
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}
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if let cachedTitle = truncatedTitleCache[title] as? String {
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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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s = s.replacingOccurrences(of: "↦", with: "")
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s = s.rs_stringByTrimmingWhitespace()
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let maxLength = 1000
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if s.count < maxLength {
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truncatedTitleCache[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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truncatedTitleCache[title] = s
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return s
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}
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func timelineTruncatedSummary(_ article: Article) -> String {
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return timelineSummaryForArticle(article)
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}
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func timelineNormalizedText(_ text: String) -> String {
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if text.isEmpty {
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return ""
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}
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if let cachedText = normalizedTextCache[text] as? String {
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return cachedText
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}
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var s = (text as NSString).rs_stringByTrimmingWhitespace()
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s = s.rs_stringWithCollapsedWhitespace()
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let result = s as String
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normalizedTextCache[text] = result
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return result
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}
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func timelineNormalizedTextTruncated(_ text: String) -> String {
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if text.isEmpty {
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return ""
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}
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if let cachedText = textCache[text] as? String {
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return cachedText
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}
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var s: NSString = (text as NSString).rsparser_stringByDecodingHTMLEntities() as NSString
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s = s.rs_stringByTrimmingWhitespace() as NSString
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s = s.rs_stringWithCollapsedWhitespace() as NSString
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let maxLength = 512
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if s.length > maxLength {
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s = s.substring(to: maxLength) as NSString
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}
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textCache[text] = String(s)
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return s as String
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}
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func timelineSummaryForArticle(_ 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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if let cachedBody = summaryCache[body] as? String {
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return cachedBody
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}
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var s = body.rs_string(byStrippingHTML: 300)
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s = timelineNormalizedText(s)
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if s == "Comments" { // Hacker News.
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s = ""
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}
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summaryCache[body] = s
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return s
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}
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private 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 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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private var token: Int = 0
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func timelineDateString(_ date: Date) -> String {
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if NSCalendar.rs_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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