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Handle TimelineDiff as an enum with associated values. (#4379)

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* Handle TimelineDiff as a true enum.

* Update the SDK.

* Silence some warnings.
This commit is contained in:
Doug
2025-08-05 09:23:22 +01:00
committed by GitHub
parent 514c7808e2
commit e182940844
8 changed files with 31 additions and 667 deletions
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ElementX/Sources/Services/Timeline/TimelineItemProvider.swift
+26 -55
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@@ -107,14 +107,11 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
}
}
// swiftlint:disable:next cyclomatic_complexity
private func buildDiff(from diff: TimelineDiff, on itemProxies: [TimelineItemProxy]) -> CollectionDifference<TimelineItemProxy>? {
var changes = [CollectionDifference<TimelineItemProxy>.Change]()
switch diff.change() {
case .append:
guard let items = diff.append() else { fatalError() }
switch diff {
case .append(let items):
for (index, item) in items.enumerated() {
let itemProxy = TimelineItemProxy(item: item)
@@ -128,11 +125,9 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
for (index, itemProxy) in itemProxies.enumerated() {
changes.append(.remove(offset: index, element: itemProxy, associatedWith: nil))
}
case .insert:
guard let update = diff.insert() else { fatalError() }
let itemProxy = TimelineItemProxy(item: update.item)
changes.append(.insert(offset: Int(update.index), element: itemProxy, associatedWith: nil))
case .insert(let index, let item):
let itemProxy = TimelineItemProxy(item: item)
changes.append(.insert(offset: Int(index), element: itemProxy, associatedWith: nil))
case .popBack:
guard let itemProxy = itemProxies.last else { fatalError() }
@@ -141,9 +136,7 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
guard let itemProxy = itemProxies.first else { fatalError() }
changes.append(.remove(offset: 0, element: itemProxy, associatedWith: nil))
case .pushBack:
guard let item = diff.pushBack() else { fatalError() }
case .pushBack(let item):
let itemProxy = TimelineItemProxy(item: item)
if itemProxy.isMembershipChange {
@@ -151,20 +144,15 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
}
changes.append(.insert(offset: Int(itemProxies.count), element: itemProxy, associatedWith: nil))
case .pushFront:
guard let item = diff.pushFront() else { fatalError() }
case .pushFront(let item):
let itemProxy = TimelineItemProxy(item: item)
changes.append(.insert(offset: 0, element: itemProxy, associatedWith: nil))
case .remove:
guard let index = diff.remove() else { fatalError() }
case .remove(let index):
let itemProxy = itemProxies[Int(index)]
changes.append(.remove(offset: Int(index), element: itemProxy, associatedWith: nil))
case .reset:
guard let items = diff.reset() else { fatalError() }
case .reset(let items):
for (index, itemProxy) in itemProxies.enumerated() {
changes.append(.remove(offset: index, element: itemProxy, associatedWith: nil))
}
@@ -172,12 +160,10 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
for (index, timelineItem) in items.enumerated() {
changes.append(.insert(offset: index, element: TimelineItemProxy(item: timelineItem), associatedWith: nil))
}
case .set:
guard let update = diff.set() else { fatalError() }
let itemProxy = TimelineItemProxy(item: update.item)
changes.append(.remove(offset: Int(update.index), element: itemProxy, associatedWith: nil))
changes.append(.insert(offset: Int(update.index), element: itemProxy, associatedWith: nil))
case .set(let index, let item):
let itemProxy = TimelineItemProxy(item: item)
changes.append(.remove(offset: Int(index), element: itemProxy, associatedWith: nil))
changes.append(.insert(offset: Int(index), element: itemProxy, associatedWith: nil))
case .truncate:
break
}
@@ -223,26 +209,17 @@ private extension Array where Element == TimelineDiff {
extension TimelineDiff: @retroactive CustomDebugStringConvertible {
public var debugDescription: String {
switch change() {
case .append:
guard let update = append() else {
fatalError()
}
return "Append(\(update.count))"
switch self {
case .append(let items):
return "Append(\(items.count))"
case .clear:
return "Clear"
case .insert:
return "Insert"
case .set:
guard let update = set() else {
fatalError()
}
return "Set(\(update.index))"
case .remove:
guard let update = remove() else {
fatalError()
}
return "Remove(\(update)"
case .set(let index, _):
return "Set(\(index))"
case .remove(let index):
return "Remove(\(index)"
case .pushBack:
return "PushBack"
case .pushFront:
@@ -251,16 +228,10 @@ extension TimelineDiff: @retroactive CustomDebugStringConvertible {
return "PopBack"
case .popFront:
return "PopFront"
case .truncate:
guard let update = truncate() else {
fatalError()
}
return "Truncate(\(update))"
case .reset:
guard let update = reset() else {
fatalError()
}
return "Reset(\(update.count)@\(update.startIndex)-\(update.endIndex))"
case .truncate(let length):
return "Truncate(\(length))"
case .reset(let items):
return "Reset(\(items.count)@\(items.startIndex)-\(items.endIndex))"
}
}
}