mirror of
https://github.com/JohnEstropia/CoreStore.git
synced 2026-01-14 21:23:43 +01:00
665 lines
22 KiB
Swift
665 lines
22 KiB
Swift
//
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// Internals.DiffableDataSourceSnapshot.swift
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// CoreStore
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//
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// Copyright © 2018 John Rommel Estropia
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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#if canImport(UIKit) || canImport(AppKit)
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import CoreData
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#if canImport(UIKit)
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import UIKit
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#elseif canImport(AppKit)
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import AppKit
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#endif
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// MARK: - Internals
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extension Internals {
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// MARK: - DiffableDataSourceSnapshot
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// Implementation based on https://github.com/ra1028/DiffableDataSources
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internal struct DiffableDataSourceSnapshot {
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// MARK: Internal
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internal let nextStateTag: UUID
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init() {
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self.structure = .init()
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self.nextStateTag = .init()
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}
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init(sections: [NSFetchedResultsSectionInfo], previousStateTag: UUID, nextStateTag: UUID) {
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self.structure = .init(sections: sections, previousStateTag: previousStateTag)
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self.nextStateTag = nextStateTag
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}
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var numberOfItems: Int {
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return self.structure.allItemIDs.count
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}
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var numberOfSections: Int {
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return self.structure.allSectionIDs.count
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}
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var allSectionIDs: [String] {
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return self.structure.allSectionIDs
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}
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var allSectionStateIDs: [SectionStateID] {
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return self.structure.allSectionStateIDs
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}
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var allItemIDs: [NSManagedObjectID] {
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return self.structure.allItemIDs
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}
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var allItemStateIDs: [ItemStateID] {
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return self.structure.allItemStateIDs
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}
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func numberOfItems(inSection identifier: String) -> Int {
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return self.itemIDs(inSection: identifier).count
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}
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func itemIDs(inSection identifier: String) -> [NSManagedObjectID] {
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return self.structure.items(in: identifier)
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}
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func itemStateIDs(inSection identifier: String) -> [ItemStateID] {
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return self.structure.itemStateIDs(in: identifier)
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}
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func sectionIDs(containingItem identifier: NSManagedObjectID) -> String? {
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return self.structure.section(containing: identifier)
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}
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func sectionStateIDs(containingItem identifier: NSManagedObjectID) -> SectionStateID? {
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return self.structure.sectionStateID(containing: identifier)
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}
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func indexOfItemID(_ identifier: NSManagedObjectID) -> Int? {
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return self.structure.allItemIDs.firstIndex(of: identifier)
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}
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func indexOfSectionID(_ identifier: String) -> Int? {
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return self.structure.allSectionIDs.firstIndex(of: identifier)
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}
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func itemIDs(where stateCondition: @escaping (UUID) -> Bool) -> [NSManagedObjectID] {
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return self.structure.itemsIDs(where: stateCondition)
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}
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mutating func appendItems(_ identifiers: [NSManagedObjectID], toSection sectionIdentifier: String?, nextStateTag: UUID) {
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self.structure.append(itemIDs: identifiers, to: sectionIdentifier, nextStateTag: nextStateTag)
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}
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mutating func insertItems(_ identifiers: [NSManagedObjectID], beforeItem beforeIdentifier: NSManagedObjectID, nextStateTag: UUID) {
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self.structure.insert(itemIDs: identifiers, before: beforeIdentifier, nextStateTag: nextStateTag)
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}
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mutating func insertItems(_ identifiers: [NSManagedObjectID], afterItem afterIdentifier: NSManagedObjectID, nextStateTag: UUID) {
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self.structure.insert(itemIDs: identifiers, after: afterIdentifier, nextStateTag: nextStateTag)
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}
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mutating func deleteItems(_ identifiers: [NSManagedObjectID]) {
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self.structure.remove(itemIDs: identifiers)
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}
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mutating func deleteAllItems() {
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self.structure.removeAllItems()
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}
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mutating func moveItem(_ identifier: NSManagedObjectID, beforeItem toIdentifier: NSManagedObjectID) {
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self.structure.move(itemID: identifier, before: toIdentifier)
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}
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mutating func moveItem(_ identifier: NSManagedObjectID, afterItem toIdentifier: NSManagedObjectID) {
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self.structure.move(itemID: identifier, after: toIdentifier)
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}
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mutating func reloadItems<S: Sequence>(_ identifiers: S, nextStateTag: UUID) where S.Element == NSManagedObjectID {
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self.structure.update(itemIDs: identifiers, nextStateTag: nextStateTag)
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}
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mutating func appendSections(_ identifiers: [String], nextStateTag: UUID) {
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self.structure.append(sectionIDs: identifiers, nextStateTag: nextStateTag)
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}
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mutating func insertSections(_ identifiers: [String], beforeSection toIdentifier: String, nextStateTag: UUID) {
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self.structure.insert(sectionIDs: identifiers, before: toIdentifier, nextStateTag: nextStateTag)
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}
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mutating func insertSections(_ identifiers: [String], afterSection toIdentifier: String, nextStateTag: UUID) {
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self.structure.insert(sectionIDs: identifiers, after: toIdentifier, nextStateTag: nextStateTag)
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}
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mutating func deleteSections(_ identifiers: [String]) {
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self.structure.remove(sectionIDs: identifiers)
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}
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mutating func moveSection(_ identifier: String, beforeSection toIdentifier: String) {
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self.structure.move(sectionID: identifier, before: toIdentifier)
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}
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mutating func moveSection(_ identifier: String, afterSection toIdentifier: String) {
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self.structure.move(sectionID: identifier, after: toIdentifier)
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}
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mutating func reloadSections<S: Sequence>(_ identifiers: S, nextStateTag: UUID) where S.Element == String {
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self.structure.update(sectionIDs: identifiers, nextStateTag: nextStateTag)
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}
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// MARK: Private
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private var structure: BackingStructure
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// MARK: - ItemStateID
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internal struct ItemStateID: Identifiable, Equatable {
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let stateTag: UUID
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init(id: NSManagedObjectID, stateTag: UUID) {
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self.id = id
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self.stateTag = stateTag
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}
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func isContentEqual(to source: ItemStateID) -> Bool {
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return self.id == source.id && self.stateTag == source.stateTag
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}
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// MARK: Identifiable
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let id: NSManagedObjectID
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}
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// MARK: - SectionStateID
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internal struct SectionStateID: Identifiable, Equatable {
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let stateTag: UUID
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init(id: String, stateTag: UUID) {
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self.id = id
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self.stateTag = stateTag
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}
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func isContentEqual(to source: SectionStateID) -> Bool {
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return self.id == source.id && self.stateTag == source.stateTag
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}
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// MARK: Identifiable
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let id: String
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}
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// MARK: - BackingStructure
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fileprivate struct BackingStructure {
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// MARK: Internal
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var sections: [Section]
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init() {
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self.sections = []
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}
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init(sections: [NSFetchedResultsSectionInfo], previousStateTag: UUID) {
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self.sections = sections.map {
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Section(
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id: $0.name,
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items: $0.objects?
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.compactMap({ ($0 as? NSManagedObject)?.objectID })
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.map({ Item(id: $0, stateTag: previousStateTag) }) ?? [],
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stateTag: previousStateTag
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)
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}
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}
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var allSectionIDs: [String] {
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return self.sections.map({ $0.id })
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}
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var allSectionStateIDs: [SectionStateID] {
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return self.sections.map({ $0.stateID })
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}
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var allItemIDs: [NSManagedObjectID] {
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return self.sections.lazy.flatMap({ $0.elements }).map({ $0.id })
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}
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var allItemStateIDs: [ItemStateID] {
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return self.sections.lazy.flatMap({ $0.elements }).map({ $0.stateID })
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}
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func items(in sectionID: String) -> [NSManagedObjectID] {
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guard let sectionIndex = self.sectionIndex(of: sectionID) else {
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Internals.abort("Section \"\(sectionID)\" does not exist")
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}
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return self.sections[sectionIndex].elements.map({ $0.id })
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}
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func itemsIDs(where stateCondition: @escaping (UUID) -> Bool) -> [NSManagedObjectID] {
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return self.sections.lazy
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.flatMap({ $0.elements.filter({ stateCondition($0.stateTag) }) })
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.map({ $0.id })
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}
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func itemStateIDs(in sectionID: String) -> [ItemStateID] {
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guard let sectionIndex = self.sectionIndex(of: sectionID) else {
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Internals.abort("Section \"\(sectionID)\" does not exist")
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}
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return self.sections[sectionIndex].elements.map({ $0.stateID })
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}
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func section(containing itemID: NSManagedObjectID) -> String? {
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return self.itemPositionMap()[itemID]?.section.id
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}
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func sectionStateID(containing itemID: NSManagedObjectID) -> SectionStateID? {
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return self.itemPositionMap()[itemID]?.section.stateID
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}
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mutating func append(itemIDs: [NSManagedObjectID], to sectionID: String?, nextStateTag: UUID) {
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let index: Array<Section>.Index
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if let sectionID = sectionID {
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guard let sectionIndex = self.sectionIndex(of: sectionID) else {
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Internals.abort("Section \"\(sectionID)\" does not exist")
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}
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index = sectionIndex
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}
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else {
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let section = self.sections
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guard !section.isEmpty else {
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Internals.abort("No sections exist")
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}
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index = section.index(before: section.endIndex)
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}
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let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
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self.sections[index].elements.append(contentsOf: items)
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}
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mutating func insert(itemIDs: [NSManagedObjectID], before beforeItemID: NSManagedObjectID, nextStateTag: UUID) {
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guard let itemPosition = self.itemPositionMap()[beforeItemID] else {
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Internals.abort("Item \(beforeItemID) does not exist")
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}
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let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
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self.sections[itemPosition.sectionIndex].elements
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.insert(contentsOf: items, at: itemPosition.itemRelativeIndex)
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}
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mutating func insert(itemIDs: [NSManagedObjectID], after afterItemID: NSManagedObjectID, nextStateTag: UUID) {
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guard let itemPosition = self.itemPositionMap()[afterItemID] else {
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Internals.abort("Item \(afterItemID) does not exist")
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}
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let itemIndex = self.sections[itemPosition.sectionIndex].elements
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.index(after: itemPosition.itemRelativeIndex)
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let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
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self.sections[itemPosition.sectionIndex].elements
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.insert(contentsOf: items, at: itemIndex)
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}
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mutating func remove(itemIDs: [NSManagedObjectID]) {
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let itemPositionMap = self.itemPositionMap()
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var removeIndexSetMap: [Int: IndexSet] = [:]
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for itemID in itemIDs {
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guard let itemPosition = itemPositionMap[itemID] else {
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continue
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}
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removeIndexSetMap[itemPosition.sectionIndex, default: []]
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.insert(itemPosition.itemRelativeIndex)
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}
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for (sectionIndex, removeIndexSet) in removeIndexSetMap {
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for range in removeIndexSet.rangeView.reversed() {
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self.sections[sectionIndex].elements.removeSubrange(range)
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}
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}
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}
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mutating func removeAllItems() {
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for sectionIndex in self.sections.indices {
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self.sections[sectionIndex].elements.removeAll()
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}
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}
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mutating func move(itemID: NSManagedObjectID, before beforeItemID: NSManagedObjectID) {
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guard let removed = self.remove(itemID: itemID) else {
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Internals.abort("Item \(itemID) does not exist")
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}
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guard let itemPosition = self.itemPositionMap()[beforeItemID] else {
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Internals.abort("Item \(beforeItemID) does not exist")
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}
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self.sections[itemPosition.sectionIndex].elements
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.insert(removed, at: itemPosition.itemRelativeIndex)
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}
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mutating func move(itemID: NSManagedObjectID, after afterItemID: NSManagedObjectID) {
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guard let removed = self.remove(itemID: itemID) else {
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Internals.abort("Item \(itemID) does not exist")
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}
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guard let itemPosition = self.itemPositionMap()[afterItemID] else {
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Internals.abort("Item \(afterItemID) does not exist")
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}
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let itemIndex = self.sections[itemPosition.sectionIndex].elements
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.index(after: itemPosition.itemRelativeIndex)
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self.sections[itemPosition.sectionIndex].elements
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.insert(removed, at: itemIndex)
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}
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mutating func update<S: Sequence>(itemIDs: S, nextStateTag: UUID) where S.Element == NSManagedObjectID {
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let itemPositionMap = self.itemPositionMap()
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for itemID in itemIDs {
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guard let itemPosition = itemPositionMap[itemID] else {
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continue
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}
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self.sections[itemPosition.sectionIndex]
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.elements[itemPosition.itemRelativeIndex].stateTag = nextStateTag
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}
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}
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mutating func append(sectionIDs: [String], nextStateTag: UUID) {
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let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
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self.sections.append(contentsOf: newSections)
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}
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mutating func insert(sectionIDs: [String], before beforeSectionID: String, nextStateTag: UUID) {
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guard let sectionIndex = self.sectionIndex(of: beforeSectionID) else {
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Internals.abort("Section \"\(beforeSectionID)\" does not exist")
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}
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let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
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self.sections.insert(contentsOf: newSections, at: sectionIndex)
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}
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mutating func insert(sectionIDs: [String], after afterSectionID: String, nextStateTag: UUID) {
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guard let beforeIndex = self.sectionIndex(of: afterSectionID) else {
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Internals.abort("Section \"\(afterSectionID)\" does not exist")
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}
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let sectionIndex = self.sections.index(after: beforeIndex)
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let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
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self.sections.insert(contentsOf: newSections, at: sectionIndex)
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}
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mutating func remove(sectionIDs: [String]) {
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for sectionID in sectionIDs {
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self.remove(sectionID: sectionID)
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}
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}
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mutating func move(sectionID: String, before beforeSectionID: String) {
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guard let removed = self.remove(sectionID: sectionID) else {
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Internals.abort("Section \"\(sectionID)\" does not exist")
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}
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guard let sectionIndex = self.sectionIndex(of: beforeSectionID) else {
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Internals.abort("Section \"\(beforeSectionID)\" does not exist")
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}
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self.sections.insert(removed, at: sectionIndex)
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}
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mutating func move(sectionID: String, after afterSectionID: String) {
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guard let removed = self.remove(sectionID: sectionID) else {
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Internals.abort("Section \"\(sectionID)\" does not exist")
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}
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guard let beforeIndex = self.sectionIndex(of: afterSectionID) else {
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Internals.abort("Section \"\(afterSectionID)\" does not exist")
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}
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let sectionIndex = self.sections.index(after: beforeIndex)
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self.sections.insert(removed, at: sectionIndex)
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}
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mutating func update<S: Sequence>(sectionIDs: S, nextStateTag: UUID) where S.Element == String {
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for sectionID in sectionIDs {
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guard let sectionIndex = self.sectionIndex(of: sectionID) else {
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continue
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}
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self.sections[sectionIndex].stateTag = nextStateTag
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}
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}
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// MARK: Private
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private static let zeroUUID: UUID = .init(uuid: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
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private func sectionIndex(of sectionID: String) -> Array<Section>.Index? {
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return self.sections.firstIndex(where: { $0.id == sectionID })
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}
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@discardableResult
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private mutating func remove(itemID: NSManagedObjectID) -> Item? {
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guard let itemPosition = self.itemPositionMap()[itemID] else {
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return nil
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}
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return self.sections[itemPosition.sectionIndex].elements
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.remove(at: itemPosition.itemRelativeIndex)
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}
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@discardableResult
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private mutating func remove(sectionID: String) -> Section? {
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guard let sectionIndex = self.sectionIndex(of: sectionID) else {
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return nil
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}
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return self.sections.remove(at: sectionIndex)
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}
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private func itemPositionMap() -> [NSManagedObjectID: ItemPosition] {
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|
|
|
return self.sections.enumerated().reduce(into: [:]) { result, section in
|
|
|
|
for (itemRelativeIndex, item) in section.element.elements.enumerated() {
|
|
|
|
result[item.id] = ItemPosition(
|
|
item: item,
|
|
itemRelativeIndex: itemRelativeIndex,
|
|
section: section.element,
|
|
sectionIndex: section.offset
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Item
|
|
|
|
fileprivate struct Item: Identifiable, Equatable {
|
|
|
|
var stateTag: UUID
|
|
|
|
init(id: NSManagedObjectID, stateTag: UUID) {
|
|
|
|
self.id = id
|
|
self.stateTag = stateTag
|
|
}
|
|
|
|
var stateID: ItemStateID {
|
|
|
|
return .init(id: self.id, stateTag: self.stateTag)
|
|
}
|
|
|
|
func isContentEqual(to source: Item) -> Bool {
|
|
|
|
return self.id == source.id && self.stateTag == source.stateTag
|
|
}
|
|
|
|
// MARK: Identifiable
|
|
|
|
let id: NSManagedObjectID
|
|
}
|
|
|
|
|
|
// MARK: - Section
|
|
|
|
fileprivate struct Section: Identifiable, Equatable {
|
|
|
|
var elements: [Item] = []
|
|
var stateTag: UUID
|
|
|
|
init(id: String, items: [Item] = [], stateTag: UUID) {
|
|
self.id = id
|
|
self.elements = items
|
|
self.stateTag = stateTag
|
|
}
|
|
|
|
init<S: Sequence>(source: Section, elements: S) where S.Element == Item {
|
|
|
|
self.init(id: source.id, items: Array(elements), stateTag: source.stateTag)
|
|
}
|
|
|
|
var stateID: SectionStateID {
|
|
|
|
return .init(id: self.id, stateTag: self.stateTag)
|
|
}
|
|
|
|
func isContentEqual(to source: Section) -> Bool {
|
|
|
|
return self.id == source.id && self.stateTag == source.stateTag
|
|
}
|
|
|
|
// MARK: Identifiable
|
|
|
|
let id: String
|
|
}
|
|
|
|
|
|
// MARK: - ItemPosition
|
|
|
|
fileprivate struct ItemPosition {
|
|
|
|
let item: Item
|
|
let itemRelativeIndex: Int
|
|
let section: Section
|
|
let sectionIndex: Int
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#endif
|