| 1 | {"version":3,"file":"index.js","sources":["../src/history.ts","../src/history-editor.ts","../src/with-history.ts"],"sourcesContent":["import { isPlainObject } from 'is-plain-object'\nimport { Operation, Range } from 'slate'\n\ninterface Batch {\n operations: Operation[]\n selectionBefore: Range | null\n}\n\n/**\n * `History` objects hold all of the operations that are applied to a value, so\n * they can be undone or redone as necessary.\n */\n\nexport interface History {\n redos: Batch[]\n undos: Batch[]\n}\n\n// eslint-disable-next-line no-redeclare\nexport const History = {\n /**\n * Check if a value is a `History` object.\n */\n\n isHistory(value: any): value is History {\n return (\n isPlainObject(value) &&\n Array.isArray(value.redos) &&\n Array.isArray(value.undos) &&\n (value.redos.length === 0 ||\n Operation.isOperationList(value.redos[0].operations)) &&\n (value.undos.length === 0 ||\n Operation.isOperationList(value.undos[0].operations))\n )\n },\n}\n","import { BaseEditor, Editor } from 'slate'\nimport { History } from './history'\n\n/**\n * Weakmaps for attaching state to the editor.\n */\n\nexport const HISTORY = new WeakMap<Editor, History>()\nexport const SAVING = new WeakMap<Editor, boolean | undefined>()\nexport const MERGING = new WeakMap<Editor, boolean | undefined>()\n\n/**\n * `HistoryEditor` contains helpers for history-enabled editors.\n */\n\nexport interface HistoryEditor extends BaseEditor {\n history: History\n undo: () => void\n redo: () => void\n writeHistory: (stack: 'undos' | 'redos', batch: any) => void\n}\n\n// eslint-disable-next-line no-redeclare\nexport const HistoryEditor = {\n /**\n * Check if a value is a `HistoryEditor` object.\n */\n\n isHistoryEditor(value: any): value is HistoryEditor {\n return History.isHistory(value.history) && Editor.isEditor(value)\n },\n\n /**\n * Get the merge flag's current value.\n */\n\n isMerging(editor: HistoryEditor): boolean | undefined {\n return MERGING.get(editor)\n },\n\n /**\n * Get the saving flag's current value.\n */\n\n isSaving(editor: HistoryEditor): boolean | undefined {\n return SAVING.get(editor)\n },\n\n /**\n * Redo to the previous saved state.\n */\n\n redo(editor: HistoryEditor): void {\n editor.redo()\n },\n\n /**\n * Undo to the previous saved state.\n */\n\n undo(editor: HistoryEditor): void {\n editor.undo()\n },\n\n /**\n * Apply a series of changes inside a synchronous `fn`, without merging any of\n * the new operations into previous save point in the history.\n */\n\n withoutMerging(editor: HistoryEditor, fn: () => void): void {\n const prev = HistoryEditor.isMerging(editor)\n MERGING.set(editor, false)\n fn()\n MERGING.set(editor, prev)\n },\n\n /**\n * Apply a series of changes inside a synchronous `fn`, without saving any of\n * their operations into the history.\n */\n\n withoutSaving(editor: HistoryEditor, fn: () => void): void {\n const prev = HistoryEditor.isSaving(editor)\n SAVING.set(editor, false)\n fn()\n SAVING.set(editor, prev)\n },\n}\n","import { Editor, Operation, Path, Range, Transforms } from 'slate'\n\nimport { HistoryEditor } from './history-editor'\n\n/**\n * The `withHistory` plugin keeps track of the operation history of a Slate\n * editor as operations are applied to it, using undo and redo stacks.\n *\n * If you are using TypeScript, you must extend Slate's CustomTypes to use\n * this plugin.\n *\n * See https://docs.slatejs.org/concepts/11-typescript to learn how.\n */\n\nexport const withHistory = <T extends Editor>(editor: T) => {\n const e = editor as T & HistoryEditor\n const { apply } = e\n e.history = { undos: [], redos: [] }\n\n e.redo = () => {\n const { history } = e\n const { redos } = history\n\n if (redos.length > 0) {\n const batch = redos[redos.length - 1]\n\n if (batch.selectionBefore) {\n Transforms.setSelection(e, batch.selectionBefore)\n }\n\n HistoryEditor.withoutSaving(e, () => {\n Editor.withoutNormalizing(e, () => {\n for (const op of batch.operations) {\n e.apply(op)\n }\n })\n })\n\n history.redos.pop()\n e.writeHistory('undos', batch)\n }\n }\n\n e.undo = () => {\n const { history } = e\n const { undos } = history\n\n if (undos.length > 0) {\n const batch = undos[undos.length - 1]\n\n HistoryEditor.withoutSaving(e, () => {\n Editor.withoutNormalizing(e, () => {\n const inverseOps = batch.operations.map(Operation.inverse).reverse()\n\n for (const op of inverseOps) {\n e.apply(op)\n }\n if (batch.selectionBefore) {\n Transforms.setSelection(e, batch.selectionBefore)\n }\n })\n })\n\n e.writeHistory('redos', batch)\n history.undos.pop()\n }\n }\n\n e.apply = (op: Operation) => {\n const { operations, history } = e\n const { undos } = history\n const lastBatch = undos[undos.length - 1]\n const lastOp =\n lastBatch && lastBatch.operations[lastBatch.operations.length - 1]\n let save = HistoryEditor.isSaving(e)\n let merge = HistoryEditor.isMerging(e)\n\n if (save == null) {\n save = shouldSave(op, lastOp)\n }\n\n if (save) {\n if (merge == null) {\n if (lastBatch == null) {\n merge = false\n } else if (operations.length !== 0) {\n merge = true\n } else {\n merge = shouldMerge(op, lastOp)\n }\n }\n\n if (lastBatch && merge) {\n lastBatch.operations.push(op)\n } else {\n const batch = {\n operations: [op],\n selectionBefore: e.selection,\n }\n e.writeHistory('undos', batch)\n }\n\n while (undos.length > 100) {\n undos.shift()\n }\n\n history.redos = []\n }\n\n apply(op)\n }\n\n e.writeHistory = (stack: 'undos' | 'redos', batch: any) => {\n e.history[stack].push(batch)\n }\n\n return e\n}\n\n/**\n * Check whether to merge an operation into the previous operation.\n */\n\nconst shouldMerge = (op: Operation, prev: Operation | undefined): boolean => {\n if (\n prev &&\n op.type === 'insert_text' &&\n prev.type === 'insert_text' &&\n op.offset === prev.offset + prev.text.length &&\n Path.equals(op.path, prev.path)\n ) {\n return true\n }\n\n if (\n prev &&\n op.type === 'remove_text' &&\n prev.type === 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