Extract out conversation tree-building code
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ab3bad0e16
commit
a314521b96
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@ -297,6 +297,7 @@
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D6C1B2082545D1EC00DAAA66 /* StatusCardView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C1B2072545D1EC00DAAA66 /* StatusCardView.swift */; };
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D6C3F4F5298ED0890009FCFF /* LocalPredicateStatusesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F4F4298ED0890009FCFF /* LocalPredicateStatusesViewController.swift */; };
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D6C3F4F7298ED7F70009FCFF /* FavoritesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F4F6298ED7F70009FCFF /* FavoritesViewController.swift */; };
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D6C3F4F9298EDBF20009FCFF /* ConversationTree.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F4F8298EDBF20009FCFF /* ConversationTree.swift */; };
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D6C693EF216192C2007D6A6D /* TuskerNavigationDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693EE216192C2007D6A6D /* TuskerNavigationDelegate.swift */; };
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D6C693FC2162FE6F007D6A6D /* LoadingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693FB2162FE6F007D6A6D /* LoadingViewController.swift */; };
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D6C693FE2162FEEA007D6A6D /* UIViewController+Children.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693FD2162FEEA007D6A6D /* UIViewController+Children.swift */; };
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@ -706,6 +707,7 @@
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D6C1B2072545D1EC00DAAA66 /* StatusCardView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StatusCardView.swift; sourceTree = "<group>"; };
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D6C3F4F4298ED0890009FCFF /* LocalPredicateStatusesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalPredicateStatusesViewController.swift; sourceTree = "<group>"; };
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D6C3F4F6298ED7F70009FCFF /* FavoritesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FavoritesViewController.swift; sourceTree = "<group>"; };
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D6C3F4F8298EDBF20009FCFF /* ConversationTree.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationTree.swift; sourceTree = "<group>"; };
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D6C693EE216192C2007D6A6D /* TuskerNavigationDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TuskerNavigationDelegate.swift; sourceTree = "<group>"; };
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D6C693FB2162FE6F007D6A6D /* LoadingViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoadingViewController.swift; sourceTree = "<group>"; };
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D6C693FD2162FEEA007D6A6D /* UIViewController+Children.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIViewController+Children.swift"; sourceTree = "<group>"; };
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@ -1088,6 +1090,7 @@
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D65B4B6329771EFF00DABDFB /* ConversationViewController.swift */,
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D601FA5C297B2E6F00A8E8B5 /* ConversationCollectionViewController.swift */,
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D601FA5E297B339100A8E8B5 /* ExpandThreadCollectionViewCell.swift */,
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D6C3F4F8298EDBF20009FCFF /* ConversationTree.swift */,
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);
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path = Conversation;
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sourceTree = "<group>";
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@ -2025,6 +2028,7 @@
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D6E77D0F286F773900D8B732 /* SplitNavigationController.swift in Sources */,
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D6B30E09254BAF63009CAEE5 /* ImageGrayscalifier.swift in Sources */,
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D6A6C10F25B62D2400298D0F /* DiskCache.swift in Sources */,
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D6C3F4F9298EDBF20009FCFF /* ConversationTree.swift in Sources */,
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D6B81F3C2560365300F6E31D /* RefreshableViewController.swift in Sources */,
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D646C958213B367000269FB5 /* LargeImageShrinkAnimationController.swift in Sources */,
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D6674AEA23341F7600E8DF94 /* AppShortcutItems.swift in Sources */,
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@ -9,16 +9,6 @@
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import UIKit
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import Pachyderm
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class ConversationNode {
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let status: StatusMO
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var children: [ConversationNode]
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init(status: StatusMO) {
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self.status = status
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self.children = []
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}
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}
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class ConversationCollectionViewController: UIViewController, CollectionViewController {
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private let mastodonController: MastodonController
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@ -136,32 +126,27 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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}
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func addContext(_ context: ConversationContext, for mainStatus: StatusMO) async {
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let parentIDs = getDirectParents(inReplyTo: mainStatus.inReplyToID, from: context.ancestors)
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let parentStatuses = context.ancestors.filter { parentIDs.contains($0.id) }
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await mastodonController.persistentContainer.addAll(statuses: parentStatuses + context.descendants)
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var snapshot = dataSource.snapshot()
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snapshot.deleteItems([.loadingIndicator])
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let mainStatusItem = Item.status(id: mainStatusID, state: mainStatusState, prevLink: mainStatus.inReplyToID != nil, nextLink: false)
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let parentItems = parentIDs.enumerated().map { index, id in
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Item.status(id: id, state: .unknown, prevLink: index > 0, nextLink: true)
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}
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snapshot.insertItems(parentItems, beforeItem: mainStatusItem)
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snapshot.reloadItems([mainStatusItem])
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await mastodonController.persistentContainer.addAll(statuses: context.ancestors + context.descendants)
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// fetch all descendant status managed objects
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let descendantIDs = context.descendants.map(\.id)
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let request = StatusMO.fetchRequest()
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request.predicate = NSPredicate(format: "id IN %@", descendantIDs)
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let descendants = try? mastodonController.persistentContainer.viewContext.fetch(request)
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if let descendants = try? mastodonController.persistentContainer.viewContext.fetch(request) {
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// convert array of descendant statuses into tree of sub-threads
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let childThreads = self.getDescendantThreads(mainStatus: mainStatus, descendants: descendants)
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// convert sub-threads into items for section and add to snapshot
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self.addFlattenedChildThreadsToSnapshot(childThreads, mainStatus: mainStatus, snapshot: &snapshot)
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let tree = ConversationTree.build(from: context, mainStatus: mainStatus, descendants: descendants ?? [])
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var snapshot = dataSource.snapshot()
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snapshot.deleteItems([.loadingIndicator])
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let mainStatusItem = Item.status(id: mainStatusID, state: mainStatusState, prevLink: mainStatus.inReplyToID != nil, nextLink: false)
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let parentItems = tree.ancestors.enumerated().map { index, id in
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Item.status(id: id, state: .unknown, prevLink: index > 0, nextLink: true)
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}
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snapshot.insertItems(parentItems, beforeItem: mainStatusItem)
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snapshot.reloadItems([mainStatusItem])
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// convert sub-threads into items for section and add to snapshot
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self.addFlattenedChildThreadsToSnapshot(tree.descendants, mainStatus: mainStatus, snapshot: &snapshot)
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self.dataSource.apply(snapshot, animatingDifferences: false) {
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let item: Item
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@ -187,54 +172,6 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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}
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}
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private func getDirectParents(inReplyTo inReplyToID: String?, from statuses: [Status]) -> [String] {
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var statuses = statuses
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var parents = [String]()
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var parentID: String? = inReplyToID
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while parentID != nil, let parentIndex = statuses.firstIndex(where: { $0.id == parentID }) {
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let parentStatus = statuses.remove(at: parentIndex)
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parents.insert(parentStatus.id, at: 0)
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parentID = parentStatus.inReplyToID
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}
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return parents
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}
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private func getDescendantThreads(mainStatus: StatusMO, descendants: [StatusMO]) -> [ConversationNode] {
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var descendants = descendants
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func removeAllInReplyTo(id: String) -> [StatusMO] {
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let statuses = descendants.filter { $0.inReplyToID == id }
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descendants.removeAll { $0.inReplyToID == id }
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return statuses
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}
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var nodes: [String: ConversationNode] = [
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mainStatus.id: ConversationNode(status: mainStatus)
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]
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var idsToCheck = [mainStatusID]
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while !idsToCheck.isEmpty {
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let inReplyToID = idsToCheck.removeFirst()
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let nodeForID = nodes[inReplyToID]!
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let inReply = removeAllInReplyTo(id: inReplyToID)
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for reply in inReply {
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idsToCheck.append(reply.id)
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let replyNode = ConversationNode(status: reply)
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nodes[reply.id] = replyNode
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nodeForID.children.append(replyNode)
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}
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}
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return nodes[mainStatusID]!.children
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}
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private func addFlattenedChildThreadsToSnapshot(_ childThreads: [ConversationNode], mainStatus: StatusMO, snapshot: inout NSDiffableDataSourceSnapshot<Section, Item>) {
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var childThreads = childThreads
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@ -0,0 +1,80 @@
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//
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// ConversationTree.swift
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// Tusker
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//
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// Created by Shadowfacts on 2/4/23.
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// Copyright © 2023 Shadowfacts. All rights reserved.
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//
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import Foundation
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import Pachyderm
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class ConversationNode {
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let status: StatusMO
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var children: [ConversationNode]
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init(status: StatusMO) {
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self.status = status
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self.children = []
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}
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}
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struct ConversationTree {
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let ancestors: [String]
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let descendants: [ConversationNode]
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static func build(from context: ConversationContext, mainStatus: StatusMO, descendants: [StatusMO]) -> ConversationTree {
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let ancestors = getDirectParents(inReplyTo: mainStatus.inReplyToID, from: context)
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let childThreads = getDescendantThreads(mainStatus: mainStatus, descendants: descendants)
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return ConversationTree(ancestors: ancestors, descendants: childThreads)
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}
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private static func getDirectParents(inReplyTo inReplyToID: String?, from context: ConversationContext) -> [String] {
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var statuses = context.ancestors
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var parents = [String]()
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var parentID: String? = inReplyToID
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while let currentParentID = parentID,
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let parentIndex = statuses.firstIndex(where: { $0.id == currentParentID }) {
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let parentStatus = statuses.remove(at: parentIndex)
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parents.insert(parentStatus.id, at: 0)
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parentID = parentStatus.inReplyToID
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}
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return parents
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}
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private static func getDescendantThreads(mainStatus: StatusMO, descendants: [StatusMO]) -> [ConversationNode] {
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var descendants = descendants
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func removeAllInReplyTo(id: String) -> [StatusMO] {
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let statuses = descendants.filter { $0.inReplyToID == id }
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descendants.removeAll { $0.inReplyToID == id }
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return statuses
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}
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let mainStatusNode = ConversationNode(status: mainStatus)
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var nodes: [String: ConversationNode] = [
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mainStatus.id: mainStatusNode
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]
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var idsToCheck = [mainStatus.id]
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while !idsToCheck.isEmpty {
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let inReplyToID = idsToCheck.removeFirst()
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let nodeForID = nodes[inReplyToID]!
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let inReply = removeAllInReplyTo(id: inReplyToID)
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for reply in inReply {
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idsToCheck.append(reply.id)
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let replyNode = ConversationNode(status: reply)
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nodes[reply.id] = replyNode
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nodeForID.children.append(replyNode)
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}
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}
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return mainStatusNode.children
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}
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}
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