277 lines
8.0 KiB
JavaScript
277 lines
8.0 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var isPlainObject = require('is-plain-object');
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var slate = require('slate');
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var History = {
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/**
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* Check if a value is a `History` object.
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*/
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isHistory: function isHistory(value) {
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return isPlainObject.isPlainObject(value) && Array.isArray(value.redos) && Array.isArray(value.undos) && (value.redos.length === 0 || slate.Operation.isOperationList(value.redos[0])) && (value.undos.length === 0 || slate.Operation.isOperationList(value.undos[0]));
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}
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};
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/**
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* Weakmaps for attaching state to the editor.
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*/
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var HISTORY = new WeakMap();
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var SAVING = new WeakMap();
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var MERGING = new WeakMap();
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var HistoryEditor = {
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/**
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* Check if a value is a `HistoryEditor` object.
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*/
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isHistoryEditor: function isHistoryEditor(value) {
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return History.isHistory(value.history) && slate.Editor.isEditor(value);
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},
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/**
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* Get the merge flag's current value.
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*/
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isMerging: function isMerging(editor) {
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return MERGING.get(editor);
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},
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/**
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* Get the saving flag's current value.
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*/
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isSaving: function isSaving(editor) {
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return SAVING.get(editor);
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},
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/**
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* Redo to the previous saved state.
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*/
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redo: function redo(editor) {
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editor.redo();
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},
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/**
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* Undo to the previous saved state.
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*/
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undo: function undo(editor) {
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editor.undo();
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},
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/**
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* Apply a series of changes inside a synchronous `fn`, without merging any of
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* the new operations into previous save point in the history.
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*/
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withoutMerging: function withoutMerging(editor, fn) {
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var prev = HistoryEditor.isMerging(editor);
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MERGING.set(editor, false);
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fn();
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MERGING.set(editor, prev);
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},
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/**
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* Apply a series of changes inside a synchronous `fn`, without saving any of
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* their operations into the history.
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*/
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withoutSaving: function withoutSaving(editor, fn) {
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var prev = HistoryEditor.isSaving(editor);
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SAVING.set(editor, false);
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fn();
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SAVING.set(editor, prev);
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}
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};
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function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }
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function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
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function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
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/**
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* The `withHistory` plugin keeps track of the operation history of a Slate
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* editor as operations are applied to it, using undo and redo stacks.
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*
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* If you are using TypeScript, you must extend Slate's CustomTypes to use
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* this plugin.
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*
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* See https://docs.slatejs.org/concepts/11-typescript to learn how.
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*/
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var withHistory = function withHistory(editor) {
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var e = editor;
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var apply = e.apply;
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e.history = {
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undos: [],
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redos: []
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};
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e.redo = function () {
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var history = e.history;
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var redos = history.redos;
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if (redos.length > 0) {
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var batch = redos[redos.length - 1];
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HistoryEditor.withoutSaving(e, function () {
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slate.Editor.withoutNormalizing(e, function () {
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var _iterator = _createForOfIteratorHelper(batch),
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_step;
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try {
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for (_iterator.s(); !(_step = _iterator.n()).done;) {
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var op = _step.value;
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e.apply(op);
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}
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} catch (err) {
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_iterator.e(err);
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} finally {
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_iterator.f();
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}
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});
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});
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history.redos.pop();
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history.undos.push(batch);
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}
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};
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e.undo = function () {
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var history = e.history;
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var undos = history.undos;
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if (undos.length > 0) {
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var batch = undos[undos.length - 1];
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HistoryEditor.withoutSaving(e, function () {
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slate.Editor.withoutNormalizing(e, function () {
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var inverseOps = batch.map(slate.Operation.inverse).reverse();
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var _iterator2 = _createForOfIteratorHelper(inverseOps),
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_step2;
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try {
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for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
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var op = _step2.value;
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e.apply(op);
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}
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} catch (err) {
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_iterator2.e(err);
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} finally {
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_iterator2.f();
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}
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});
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});
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history.redos.push(batch);
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history.undos.pop();
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}
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};
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e.apply = function (op) {
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var operations = e.operations,
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history = e.history;
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var undos = history.undos;
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var lastBatch = undos[undos.length - 1];
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var lastOp = lastBatch && lastBatch[lastBatch.length - 1];
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var overwrite = shouldOverwrite(op, lastOp);
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var save = HistoryEditor.isSaving(e);
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var merge = HistoryEditor.isMerging(e);
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if (save == null) {
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save = shouldSave(op);
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}
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if (save) {
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if (merge == null) {
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if (lastBatch == null) {
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merge = false;
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} else if (operations.length !== 0) {
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merge = true;
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} else {
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merge = shouldMerge(op, lastOp) || overwrite;
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}
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}
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if (lastBatch && merge) {
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if (overwrite) {
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lastBatch.pop();
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}
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lastBatch.push(op);
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} else {
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var batch = [op];
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undos.push(batch);
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}
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while (undos.length > 100) {
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undos.shift();
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}
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if (shouldClear(op)) {
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history.redos = [];
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}
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}
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apply(op);
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};
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return e;
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};
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/**
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* Check whether to merge an operation into the previous operation.
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*/
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var shouldMerge = function shouldMerge(op, prev) {
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if (op.type === 'set_selection') {
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return true;
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}
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if (prev && op.type === 'insert_text' && prev.type === 'insert_text' && op.offset === prev.offset + prev.text.length && slate.Path.equals(op.path, prev.path)) {
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return true;
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}
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if (prev && op.type === 'remove_text' && prev.type === 'remove_text' && op.offset + op.text.length === prev.offset && slate.Path.equals(op.path, prev.path)) {
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return true;
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}
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return false;
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};
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/**
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* Check whether an operation needs to be saved to the history.
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*/
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var shouldSave = function shouldSave(op, prev) {
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if (op.type === 'set_selection' && (op.properties == null || op.newProperties == null)) {
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return false;
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}
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return true;
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};
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/**
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* Check whether an operation should overwrite the previous one.
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*/
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var shouldOverwrite = function shouldOverwrite(op, prev) {
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if (prev && op.type === 'set_selection' && prev.type === 'set_selection') {
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return true;
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}
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return false;
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};
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/**
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* Check whether an operation should clear the redos stack.
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*/
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var shouldClear = function shouldClear(op) {
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if (op.type === 'set_selection') {
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return false;
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}
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return true;
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};
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exports.HISTORY = HISTORY;
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exports.History = History;
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exports.HistoryEditor = HistoryEditor;
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exports.MERGING = MERGING;
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exports.SAVING = SAVING;
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exports.withHistory = withHistory;
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//# sourceMappingURL=index.js.map
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