mirror of
https://github.com/JohnEstropia/CoreStore.git
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578 lines
19 KiB
Swift
578 lines
19 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: DiffableDataSourceSnapshotProtocol {
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// MARK: Internal
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init(sections: [NSFetchedResultsSectionInfo]) {
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self.structure = .init(sections: sections)
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}
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var sections: [Section] {
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get {
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return self.structure.sections
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}
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set {
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self.structure.sections = newValue
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}
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}
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// MARK: DiffableDataSourceSnapshotProtocol
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init() {
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self.structure = .init()
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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 sectionIdentifiers: [String] {
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return self.structure.allSectionIDs
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}
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var itemIdentifiers: [NSManagedObjectID] {
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return self.structure.allItemIDs
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}
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func numberOfItems(inSection identifier: String) -> Int {
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return self.itemIdentifiers(inSection: identifier).count
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}
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func itemIdentifiers(inSection identifier: String) -> [NSManagedObjectID] {
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return self.structure.items(in: identifier)
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}
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func sectionIdentifier(containingItem identifier: NSManagedObjectID) -> String? {
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return self.structure.section(containing: identifier)
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}
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func indexOfItem(_ identifier: NSManagedObjectID) -> Int? {
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return self.structure.allItemIDs.firstIndex(of: identifier)
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}
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func indexOfSection(_ identifier: String) -> Int? {
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return self.structure.allSectionIDs.firstIndex(of: identifier)
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}
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mutating func appendItems(_ identifiers: [NSManagedObjectID], toSection sectionIdentifier: String?) {
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self.structure.append(itemIDs: identifiers, to: sectionIdentifier)
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}
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mutating func insertItems(_ identifiers: [NSManagedObjectID], beforeItem beforeIdentifier: NSManagedObjectID) {
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self.structure.insert(itemIDs: identifiers, before: beforeIdentifier)
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}
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mutating func insertItems(_ identifiers: [NSManagedObjectID], afterItem afterIdentifier: NSManagedObjectID) {
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self.structure.insert(itemIDs: identifiers, after: afterIdentifier)
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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(_ identifiers: [NSManagedObjectID]) {
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self.structure.update(itemIDs: identifiers)
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}
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mutating func appendSections(_ identifiers: [String]) {
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self.structure.append(sectionIDs: identifiers)
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}
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mutating func insertSections(_ identifiers: [String], beforeSection toIdentifier: String) {
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self.structure.insert(sectionIDs: identifiers, before: toIdentifier)
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}
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mutating func insertSections(_ identifiers: [String], afterSection toIdentifier: String) {
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self.structure.insert(sectionIDs: identifiers, after: toIdentifier)
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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(_ identifiers: [String]) {
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self.structure.update(sectionIDs: identifiers)
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}
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// MARK: Private
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private var structure: BackingStructure
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// MARK: - Section
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internal struct Section: DifferentiableSection, Equatable {
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var isReloaded: Bool
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init(differenceIdentifier: String, items: [Item] = [], isReloaded: Bool = false) {
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self.differenceIdentifier = differenceIdentifier
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self.elements = items
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self.isReloaded = isReloaded
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}
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// MARK: Differentiable
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let differenceIdentifier: String
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func isContentEqual(to source: Section) -> Bool {
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return !self.isReloaded
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&& self.differenceIdentifier == source.differenceIdentifier
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}
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// MARK: DifferentiableSection
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var elements: [Item] = []
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init<S: Sequence>(source: Section, elements: S) where S.Element == Item {
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self.init(
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differenceIdentifier: source.differenceIdentifier,
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items: Array(elements),
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isReloaded: source.isReloaded
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)
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}
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}
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// MARK: - Item
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internal struct Item: Differentiable, Equatable {
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var isReloaded: Bool
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init(differenceIdentifier: NSManagedObjectID, isReloaded: Bool = false) {
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self.differenceIdentifier = differenceIdentifier
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self.isReloaded = isReloaded
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}
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// MARK: Differentiable
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let differenceIdentifier: NSManagedObjectID
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func isContentEqual(to source: Item) -> Bool {
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return !self.isReloaded
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&& self.differenceIdentifier == source.differenceIdentifier
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}
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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]) {
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self.sections = sections.map {
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Section(
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differenceIdentifier: $0.name,
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items: $0.objects?
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.compactMap({ ($0 as? NSManagedObject)?.objectID })
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.map({ Item(differenceIdentifier: $0) }) ?? []
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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.differenceIdentifier })
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}
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var allItemIDs: [NSManagedObjectID] {
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return self.sections.lazy.flatMap({ $0.elements }).map({ $0.differenceIdentifier })
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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.differenceIdentifier })
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}
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func section(containing itemID: NSManagedObjectID) -> String? {
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return self.itemPositionMap()[itemID]?.section.differenceIdentifier
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}
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mutating func append(itemIDs: [NSManagedObjectID], to sectionID: String?) {
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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(differenceIdentifier: $0) })
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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) {
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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(differenceIdentifier: $0) })
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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) {
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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(differenceIdentifier: $0) })
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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) 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].isReloaded = true
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}
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}
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mutating func append(sectionIDs: [String]) {
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let newSections = sectionIDs.lazy.map({ Section(differenceIdentifier: $0) })
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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) {
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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(differenceIdentifier: $0) })
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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) {
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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(differenceIdentifier: $0) })
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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) 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].isReloaded = true
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}
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}
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// MARK: Private
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private func sectionIndex(of sectionID: String) -> Array<Section>.Index? {
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return self.sections.firstIndex(where: { $0.differenceIdentifier == 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
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for (itemRelativeIndex, item) in section.element.elements.enumerated() {
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result[item.differenceIdentifier] = ItemPosition(
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item: item,
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itemRelativeIndex: itemRelativeIndex,
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section: section.element,
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sectionIndex: section.offset
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)
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}
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}
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}
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// MARK: - ItemPosition
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fileprivate struct ItemPosition {
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let item: Item
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let itemRelativeIndex: Int
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let section: Section
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let sectionIndex: Int
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}
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}
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}
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}
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// MARK: - NSDiffableDataSourceSnapshot: DiffableDataSourceSnapshotProtocol
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@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
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extension NSDiffableDataSourceSnapshot: DiffableDataSourceSnapshotProtocol where SectionIdentifierType == String, ItemIdentifierType == NSManagedObjectID {}
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#endif
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