@tldraw/editor/dist-esm/lib/editor/managers/HistoryManager/HistoryManager.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../../../src/lib/editor/managers/HistoryManager/HistoryManager.ts"],
  "sourcesContent": ["import { atom, transact } from '@tldraw/state'\nimport {\n\tRecordsDiff,\n\tStore,\n\tUnknownRecord,\n\tcreateEmptyRecordsDiff,\n\tisRecordsDiffEmpty,\n\treverseRecordsDiff,\n\tsquashRecordDiffsMutable,\n} from '@tldraw/store'\nimport { exhaustiveSwitchError, noop } from '@tldraw/utils'\nimport { TLHistoryBatchOptions, TLHistoryEntry } from '../../types/history-types'\n\nenum HistoryRecorderState {\n\tRecording = 'recording',\n\tRecordingPreserveRedoStack = 'recordingPreserveRedoStack',\n\tPaused = 'paused',\n}\n\n/** @public */\nexport class HistoryManager<R extends UnknownRecord> {\n\tprivate readonly store: Store<R>\n\n\treadonly dispose: () => void\n\n\tprivate state: HistoryRecorderState = HistoryRecorderState.Recording\n\tprivate readonly pendingDiff = new PendingDiff<R>()\n\tprivate stacks = atom(\n\t\t'HistoryManager.stacks',\n\t\t{\n\t\t\tundos: stack<TLHistoryEntry<R>>(),\n\t\t\tredos: stack<TLHistoryEntry<R>>(),\n\t\t},\n\t\t{\n\t\t\tisEqual: (a, b) => a.undos === b.undos && a.redos === b.redos,\n\t\t}\n\t)\n\n\tprivate readonly annotateError: (error: unknown) => void\n\n\tconstructor(opts: { store: Store<R>; annotateError?(error: unknown): void }) {\n\t\tthis.store = opts.store\n\t\tthis.annotateError = opts.annotateError ?? noop\n\t\tthis.dispose = this.store.addHistoryInterceptor((entry, source) => {\n\t\t\tif (source !== 'user') return\n\n\t\t\tswitch (this.state) {\n\t\t\t\tcase HistoryRecorderState.Recording:\n\t\t\t\t\tthis.pendingDiff.apply(entry.changes)\n\t\t\t\t\tthis.stacks.update(({ undos }) => ({ undos, redos: stack() }))\n\t\t\t\t\tbreak\n\t\t\t\tcase HistoryRecorderState.RecordingPreserveRedoStack:\n\t\t\t\t\tthis.pendingDiff.apply(entry.changes)\n\t\t\t\t\tbreak\n\t\t\t\tcase HistoryRecorderState.Paused:\n\t\t\t\t\tbreak\n\t\t\t\tdefault:\n\t\t\t\t\texhaustiveSwitchError(this.state)\n\t\t\t}\n\t\t})\n\t}\n\n\tprivate flushPendingDiff() {\n\t\tif (this.pendingDiff.isEmpty()) return\n\n\t\tconst diff = this.pendingDiff.clear()\n\t\tthis.stacks.update(({ undos, redos }) => ({\n\t\t\tundos: undos.push({ type: 'diff', diff }),\n\t\t\tredos,\n\t\t}))\n\t}\n\n\tgetNumUndos() {\n\t\treturn this.stacks.get().undos.length + (this.pendingDiff.isEmpty() ? 0 : 1)\n\t}\n\n\tgetNumRedos() {\n\t\treturn this.stacks.get().redos.length\n\t}\n\n\t/** @internal */\n\t_isInBatch = false\n\n\tbatch(fn: () => void, opts?: TLHistoryBatchOptions) {\n\t\tconst previousState = this.state\n\n\t\t// we move to the new state only if we haven't explicitly paused\n\t\tif (previousState !== HistoryRecorderState.Paused && opts?.history) {\n\t\t\tthis.state = modeToState[opts.history]\n\t\t}\n\n\t\ttry {\n\t\t\tif (this._isInBatch) {\n\t\t\t\ttransact(fn)\n\t\t\t\treturn this\n\t\t\t}\n\n\t\t\tthis._isInBatch = true\n\t\t\ttry {\n\t\t\t\ttransact(fn)\n\t\t\t} catch (error) {\n\t\t\t\tthis.annotateError(error)\n\t\t\t\tthrow error\n\t\t\t} finally {\n\t\t\t\tthis._isInBatch = false\n\t\t\t}\n\n\t\t\treturn this\n\t\t} finally {\n\t\t\tthis.state = previousState\n\t\t}\n\t}\n\n\t// History\n\t_undo({ pushToRedoStack, toMark = undefined }: { pushToRedoStack: boolean; toMark?: string }) {\n\t\tconst previousState = this.state\n\t\tthis.state = HistoryRecorderState.Paused\n\t\ttry {\n\t\t\tlet { undos, redos } = this.stacks.get()\n\n\t\t\t// start by collecting the pending diff (everything since the last mark).\n\t\t\t// we'll accumulate the diff to undo in this variable so we can apply it atomically.\n\t\t\tconst pendingDiff = this.pendingDiff.clear()\n\t\t\tconst isPendingDiffEmpty = isRecordsDiffEmpty(pendingDiff)\n\t\t\tconst diffToUndo = reverseRecordsDiff(pendingDiff)\n\n\t\t\tif (pushToRedoStack && !isPendingDiffEmpty) {\n\t\t\t\tredos = redos.push({ type: 'diff', diff: pendingDiff })\n\t\t\t}\n\n\t\t\tlet didFindMark = false\n\t\t\tif (isPendingDiffEmpty) {\n\t\t\t\t// if nothing has happened since the last mark, pop any intermediate marks off the stack\n\t\t\t\twhile (undos.head?.type === 'stop') {\n\t\t\t\t\tconst mark = undos.head\n\t\t\t\t\tundos = undos.tail\n\t\t\t\t\tif (pushToRedoStack) {\n\t\t\t\t\t\tredos = redos.push(mark)\n\t\t\t\t\t}\n\t\t\t\t\tif (mark.id === toMark) {\n\t\t\t\t\t\tdidFindMark = true\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (!didFindMark) {\n\t\t\t\tloop: while (undos.head) {\n\t\t\t\t\tconst undo = undos.head\n\t\t\t\t\tundos = undos.tail\n\n\t\t\t\t\tif (pushToRedoStack) {\n\t\t\t\t\t\tredos = redos.push(undo)\n\t\t\t\t\t}\n\n\t\t\t\t\tswitch (undo.type) {\n\t\t\t\t\t\tcase 'diff':\n\t\t\t\t\t\t\tsquashRecordDiffsMutable(diffToUndo, [reverseRecordsDiff(undo.diff)])\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\tcase 'stop':\n\t\t\t\t\t\t\tif (!toMark) break loop\n\t\t\t\t\t\t\tif (undo.id === toMark) {\n\t\t\t\t\t\t\t\tdidFindMark = true\n\t\t\t\t\t\t\t\tbreak loop\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\tdefault:\n\t\t\t\t\t\t\texhaustiveSwitchError(undo)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (!didFindMark && toMark) {\n\t\t\t\t// whoops, we didn't find the mark we were looking for\n\t\t\t\t// don't do anything\n\t\t\t\treturn this\n\t\t\t}\n\n\t\t\tthis.store.applyDiff(diffToUndo, { ignoreEphemeralKeys: true })\n\t\t\tthis.store.ensureStoreIsUsable()\n\t\t\tthis.stacks.set({ undos, redos })\n\t\t} finally {\n\t\t\tthis.state = previousState\n\t\t}\n\n\t\treturn this\n\t}\n\n\tundo() {\n\t\tthis._undo({ pushToRedoStack: true })\n\n\t\treturn this\n\t}\n\n\tredo() {\n\t\tconst previousState = this.state\n\t\tthis.state = HistoryRecorderState.Paused\n\t\ttry {\n\t\t\tthis.flushPendingDiff()\n\n\t\t\tlet { undos, redos } = this.stacks.get()\n\t\t\tif (redos.length === 0) {\n\t\t\t\treturn this\n\t\t\t}\n\n\t\t\t// ignore any intermediate marks - this should take us to the first `diff` entry\n\t\t\twhile (redos.head?.type === 'stop') {\n\t\t\t\tundos = undos.push(redos.head)\n\t\t\t\tredos = redos.tail\n\t\t\t}\n\n\t\t\t// accumulate diffs to be redone so they can be applied atomically\n\t\t\tconst diffToRedo = createEmptyRecordsDiff<R>()\n\n\t\t\twhile (redos.head) {\n\t\t\t\tconst redo = redos.head\n\t\t\t\tundos = undos.push(redo)\n\t\t\t\tredos = redos.tail\n\n\t\t\t\tif (redo.type === 'diff') {\n\t\t\t\t\tsquashRecordDiffsMutable(diffToRedo, [redo.diff])\n\t\t\t\t} else {\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.store.applyDiff(diffToRedo, { ignoreEphemeralKeys: true })\n\t\t\tthis.store.ensureStoreIsUsable()\n\t\t\tthis.stacks.set({ undos, redos })\n\t\t} finally {\n\t\t\tthis.state = previousState\n\t\t}\n\n\t\treturn this\n\t}\n\n\tbail() {\n\t\tthis._undo({ pushToRedoStack: false })\n\n\t\treturn this\n\t}\n\n\tbailToMark(id: string) {\n\t\tif (id) {\n\t\t\tthis._undo({ pushToRedoStack: false, toMark: id })\n\t\t}\n\n\t\treturn this\n\t}\n\n\tsquashToMark(id: string) {\n\t\t// remove marks between head and the mark\n\n\t\tlet top = this.stacks.get().undos\n\t\tconst popped: Array<RecordsDiff<R>> = []\n\n\t\twhile (top.head && !(top.head.type === 'stop' && top.head.id === id)) {\n\t\t\tif (top.head.type === 'diff') {\n\t\t\t\tpopped.push(top.head.diff)\n\t\t\t}\n\t\t\ttop = top.tail\n\t\t}\n\n\t\tif (!top.head || top.head?.id !== id) {\n\t\t\tconsole.error('Could not find mark to squash to: ', id)\n\t\t\treturn this\n\t\t}\n\t\tif (popped.length === 0) {\n\t\t\treturn this\n\t\t}\n\n\t\tconst diff = createEmptyRecordsDiff<R>()\n\t\tsquashRecordDiffsMutable(diff, popped.reverse())\n\n\t\tthis.stacks.update(({ redos }) => ({\n\t\t\tundos: top.push({\n\t\t\t\ttype: 'diff',\n\t\t\t\tdiff,\n\t\t\t}),\n\t\t\tredos,\n\t\t}))\n\n\t\treturn this\n\t}\n\n\t/** @internal */\n\t_mark(id: string) {\n\t\ttransact(() => {\n\t\t\tthis.flushPendingDiff()\n\t\t\tthis.stacks.update(({ undos, redos }) => ({ undos: undos.push({ type: 'stop', id }), redos }))\n\t\t})\n\t}\n\n\tclear() {\n\t\tthis.stacks.set({ undos: stack(), redos: stack() })\n\t\tthis.pendingDiff.clear()\n\t}\n\n\t/** @internal */\n\tgetMarkIdMatching(idSubstring: string) {\n\t\tlet top = this.stacks.get().undos\n\t\twhile (top.head) {\n\t\t\tif (top.head.type === 'stop' && top.head.id.includes(idSubstring)) {\n\t\t\t\treturn top.head.id\n\t\t\t}\n\t\t\ttop = top.tail\n\t\t}\n\t\treturn null\n\t}\n\n\t/** @internal */\n\tdebug() {\n\t\tconst { undos, redos } = this.stacks.get()\n\t\treturn {\n\t\t\tundos: undos.toArray(),\n\t\t\tredos: redos.toArray(),\n\t\t\tpendingDiff: this.pendingDiff.debug(),\n\t\t\tstate: this.state as string,\n\t\t}\n\t}\n}\n\nconst modeToState = {\n\trecord: HistoryRecorderState.Recording,\n\t'record-preserveRedoStack': HistoryRecorderState.RecordingPreserveRedoStack,\n\tignore: HistoryRecorderState.Paused,\n} as const\n\nclass PendingDiff<R extends UnknownRecord> {\n\tprivate diff = createEmptyRecordsDiff<R>()\n\tprivate isEmptyAtom = atom('PendingDiff.isEmpty', true)\n\n\tclear() {\n\t\tconst diff = this.diff\n\t\tthis.diff = createEmptyRecordsDiff<R>()\n\t\tthis.isEmptyAtom.set(true)\n\t\treturn diff\n\t}\n\n\tisEmpty() {\n\t\treturn this.isEmptyAtom.get()\n\t}\n\n\tapply(diff: RecordsDiff<R>) {\n\t\tsquashRecordDiffsMutable(this.diff, [diff])\n\t\tthis.isEmptyAtom.set(isRecordsDiffEmpty(this.diff))\n\t}\n\n\tdebug() {\n\t\treturn { diff: this.diff, isEmpty: this.isEmpty() }\n\t}\n}\n\nimport { EMPTY_ARRAY } from '@tldraw/state'\n\nexport type Stack<T> = StackItem<T> | EmptyStackItem<T>\n\nexport function stack<T>(items?: Array<T>): Stack<T> {\n\tif (items) {\n\t\tlet result = EMPTY_STACK_ITEM as Stack<T>\n\t\twhile (items.length) {\n\t\t\tresult = result.push(items.pop()!)\n\t\t}\n\t\treturn result\n\t}\n\treturn EMPTY_STACK_ITEM as any\n}\n\nclass EmptyStackItem<T> implements Iterable<T> {\n\treadonly length = 0\n\treadonly head = null\n\treadonly tail: Stack<T> = this\n\n\tpush(head: T): Stack<T> {\n\t\treturn new StackItem<T>(head, this)\n\t}\n\n\ttoArray() {\n\t\treturn EMPTY_ARRAY\n\t}\n\n\t[Symbol.iterator]() {\n\t\treturn {\n\t\t\tnext() {\n\t\t\t\treturn { value: undefined, done: true as const }\n\t\t\t},\n\t\t}\n\t}\n}\n\nconst EMPTY_STACK_ITEM = new EmptyStackItem()\n\nclass StackItem<T> implements Iterable<T> {\n\tlength: number\n\tconstructor(\n\t\tpublic readonly head: T,\n\t\tpublic readonly tail: Stack<T>\n\t) {\n\t\tthis.length = tail.length + 1\n\t}\n\n\tpush(head: T): Stack<T> {\n\t\treturn new StackItem(head, this)\n\t}\n\n\ttoArray() {\n\t\treturn Array.from(this)\n\t}\n\n\t[Symbol.iterator]() {\n\t\tlet stack = this as Stack<T>\n\t\treturn {\n\t\t\tnext() {\n\t\t\t\tif (stack.length) {\n\t\t\t\t\tconst value = stack.head!\n\t\t\t\t\tstack = stack.tail\n\t\t\t\t\treturn { value, done: false as const }\n\t\t\t\t} else {\n\t\t\t\t\treturn { value: undefined, done: true as const }\n\t\t\t\t}\n\t\t\t},\n\t\t}\n\t}\n}\n"],
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}