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// Max stack size that cannot be exceeded. When exceeded, old undo history will be dropped
// to keep size under limit. This is kept at 10MB
const MAX_SIZE_LIMIT = 1e7;
class SnapshotsManagerImpl implements SnapshotsManager {
private snapshots: Snapshots;
private hasNewContentValue: boolean = false;
constructor(snapshots?: Snapshots) {
this.snapshots = snapshots ?? {
snapshots: [],
totalSize: 0,
currentIndex: -1,
autoCompleteIndex: -1,
maxSize: MAX_SIZE_LIMIT,
};
}
get hasNewContent(): boolean {
return this.hasNewContentValue;
}
set hasNewContent(value: boolean) {
this.hasNewContentValue = value;
}
canMove(step: number): boolean {
const newIndex = this.snapshots.currentIndex + step;
return newIndex >= 0 && newIndex < this.snapshots.snapshots.length;
}
move(step: number): Snapshot | null {
let result: Snapshot | null = null;
if (this.canMove(step)) {
this.snapshots.currentIndex += step;
this.snapshots.autoCompleteIndex = -1;
result = this.snapshots.snapshots[this.snapshots.currentIndex];
}
this.snapshots.onChanged?.('move');
return result;
}
addSnapshot(snapshot: Snapshot, isAutoCompleteSnapshot: boolean): void {
const currentSnapshot = this.snapshots.snapshots[this.snapshots.currentIndex];
const isSameSnapshot =
currentSnapshot &&
currentSnapshot.html == snapshot.html &&
!currentSnapshot.additionalState &&
!snapshot.additionalState &&
!currentSnapshot.entityStates &&
!snapshot.entityStates;
const addSnapshot = !currentSnapshot || shouldAddSnapshot(currentSnapshot, snapshot);
if (this.snapshots.currentIndex < 0 || addSnapshot) {
this.clearRedo();
this.snapshots.snapshots.push(snapshot);
this.snapshots.currentIndex++;
this.snapshots.totalSize += this.getSnapshotLength(snapshot);
let removeCount = 0;
while (
removeCount < this.snapshots.snapshots.length &&
this.snapshots.totalSize > this.snapshots.maxSize
) {
this.snapshots.totalSize -= this.getSnapshotLength(
this.snapshots.snapshots[removeCount]
);
removeCount++;
}
if (removeCount > 0) {
this.snapshots.snapshots.splice(0, removeCount);
this.snapshots.currentIndex -= removeCount;
Iif (this.snapshots.autoCompleteIndex >= 0) {
this.snapshots.autoCompleteIndex -= removeCount;
}
}
if (isAutoCompleteSnapshot) {
this.snapshots.autoCompleteIndex = this.snapshots.currentIndex;
}
} else if (isSameSnapshot) {
// replace the currentSnapshot's metadata so the selection is updated
this.snapshots.snapshots.splice(this.snapshots.currentIndex, 1, snapshot);
}
this.snapshots.onChanged?.('add');
}
clearRedo(): void {
if (this.canMove(1)) {
let removedSize = 0;
for (
let i = this.snapshots.currentIndex + 1;
i < this.snapshots.snapshots.length;
i++
) {
removedSize += this.getSnapshotLength(this.snapshots.snapshots[i]);
}
this.snapshots.snapshots.splice(this.snapshots.currentIndex + 1);
this.snapshots.totalSize -= removedSize;
this.snapshots.autoCompleteIndex = -1;
this.snapshots.onChanged?.('clear');
}
}
canUndoAutoComplete(): boolean {
return (
this.snapshots.autoCompleteIndex >= 0 &&
this.snapshots.currentIndex - this.snapshots.autoCompleteIndex == 1
);
}
private getSnapshotLength(snapshot: Snapshot) {
return snapshot.html?.length ?? 0;
}
}
/**
* @internal
* Create a new instance of Undo Snapshots Manager
* @param snapshots @optional Snapshots object for storing undo snapshots. If not passed, default implementation will be used
*/
export function createSnapshotsManager(snapshots?: Snapshots): SnapshotsManager {
return new SnapshotsManagerImpl(snapshots);
}
function shouldAddSnapshot(currentSnapshot: Snapshot, snapshot: Snapshot) {
return (
currentSnapshot.html !== snapshot.html ||
(currentSnapshot.additionalState &&
snapshot.additionalState &&
JSON.stringify(currentSnapshot.additionalState) !==
JSON.stringify(snapshot.additionalState)) ||
(!currentSnapshot.additionalState && snapshot.additionalState) ||
(currentSnapshot.entityStates &&
snapshot.entityStates &&
currentSnapshot.entityStates !== snapshot.entityStates) ||
(!currentSnapshot.entityStates && snapshot.entityStates)
);
}
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