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- doRender() now catches render errors and emits a fallback line - autonomousStatus ANSI formatting extracted to renderAutonomousStatus() with named color constants instead of raw escape strings - parseCellSizeResponse extracted to pure function with proper validation Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
57 lines
1.4 KiB
TypeScript
57 lines
1.4 KiB
TypeScript
/**
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* Generic undo stack with clone-on-push semantics.
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*
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* Stores deep clones of state snapshots. Popped snapshots are returned
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* directly (no re-cloning) since they are already detached.
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*/
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export class UndoStack<S> {
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private stack: S[] = [];
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private redoStack: S[] = [];
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/** Push a deep clone of the given state onto the undo stack. Clears redo history. */
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push(state: S): void {
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this.stack.push(structuredClone(state));
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this.redoStack.length = 0;
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}
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/** Pop and return the most recent undo snapshot, or undefined if empty. */
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pop(): S | undefined {
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return this.stack.pop();
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}
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/**
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* Push a deep clone of the given state onto the redo stack.
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* Called by the editor before applying an undo so the state can be redone.
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*/
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pushRedo(state: S): void {
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this.redoStack.push(structuredClone(state));
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}
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/**
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* Push a deep clone of the given state onto the undo stack without clearing
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* the redo stack. Called by the editor before applying a redo so the state
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* remains undoable.
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*/
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pushUndo(state: S): void {
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this.stack.push(structuredClone(state));
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}
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/** Pop and return the most recent redo snapshot, or undefined if empty. */
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redo(): S | undefined {
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return this.redoStack.pop();
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}
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canRedo(): boolean {
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return this.redoStack.length > 0;
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}
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/** Remove all snapshots from both undo and redo stacks. */
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clear(): void {
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this.stack.length = 0;
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this.redoStack.length = 0;
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}
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get length(): number {
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return this.stack.length;
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}
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}
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