diff --git a/Shared/PostList/PostListModel.swift b/Shared/PostList/PostListModel.swift index 5d0e369..a2217f9 100644 --- a/Shared/PostList/PostListModel.swift +++ b/Shared/PostList/PostListModel.swift @@ -1,123 +1,123 @@ import SwiftUI import CoreData class PostListModel: ObservableObject { func remove(_ post: WFAPost) { LocalStorageManager.persistentContainer.viewContext.delete(post) LocalStorageManager().saveContext() } func purgePublishedPosts() { let fetchRequest: NSFetchRequest = NSFetchRequest(entityName: "WFAPost") fetchRequest.predicate = NSPredicate(format: "status != %i", 0) let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest) do { try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest) } catch { print("Error: Failed to purge cached posts.") } } func getBodyPreview(of post: WFAPost) -> String { var elidedPostBody: String = "" // Strip any markdown from the post body. let strippedPostBody = stripMarkdown(from: post.body) // Extract lede from post. elidedPostBody = extractLede(from: strippedPostBody) return elidedPostBody } } private extension PostListModel { func stripMarkdown(from string: String) -> String { var strippedString = string strippedString = stripHeadingOctothorpes(from: strippedString) strippedString = stripImages(from: strippedString, keepAltText: true) return strippedString } func stripHeadingOctothorpes(from string: String) -> String { let newLines = CharacterSet.newlines var processedComponents: [String] = [] let components = string.components(separatedBy: newLines) for component in components { if component.isEmpty { continue } var newString = component while newString.first == "#" { newString.removeFirst() } if newString.hasPrefix(" ") { newString.removeFirst() } processedComponents.append(newString) } let headinglessString = processedComponents.joined(separator: "\n\n") return headinglessString } func stripImages(from string: String, keepAltText: Bool = false) -> String { let pattern = #"!\[[\"]?(.*?)[\"|]?\]\(.*?\)"# var processedComponents: [String] = [] let components = string.components(separatedBy: .newlines) for component in components { if component.isEmpty { continue } var processedString: String = component if keepAltText { let regex = try? NSRegularExpression(pattern: pattern, options: []) if let matches = regex?.matches( in: component, options: [], range: NSRange(location: 0, length: component.utf16.count) ) { for match in matches { if let range = Range(match.range(at: 1), in: component) { processedString = "\(component[range])" } } } } else { let range = component.startIndex.. String { if string.utf16.count <= 80 { return string } let truncatedString = string.prefix(80) let terminatingCharacters = CharacterSet(charactersIn: ".。?").union(.newlines) var lede: String // Extract the first sentence from the lede. let sentences = truncatedString.components(separatedBy: terminatingCharacters) let firstSentence = sentences.filter { !$0.isEmpty }[0] if firstSentence == truncatedString { let endOfStringIndex = truncatedString.lastIndex(of: " ") lede = String( truncatedString[..<(endOfStringIndex ?? truncatedString.index(truncatedString.endIndex, offsetBy: -2))] ) + "…" } else { - lede = firstSentence + lede = String(truncatedString[...firstSentence.endIndex]) } return lede } }