slate-history
Version:
An operation-based history implementation for Slate editors.
223 lines (217 loc) • 7.93 kB
JavaScript
;
var isPlainObject = require('is-plain-object');
var slate = require('slate');
// eslint-disable-next-line no-redeclare
var History = {
/**
* Check if a value is a `History` object.
*/
isHistory: function isHistory(value) {
return isPlainObject.isPlainObject(value) && Array.isArray(value.redos) && Array.isArray(value.undos) && (value.redos.length === 0 || slate.Operation.isOperationList(value.redos[0].operations)) && (value.undos.length === 0 || slate.Operation.isOperationList(value.undos[0].operations));
}
};
/**
* Weakmaps for attaching state to the editor.
*/
var HISTORY = new WeakMap();
var SAVING = new WeakMap();
var MERGING = new WeakMap();
// eslint-disable-next-line no-redeclare
var HistoryEditor = {
/**
* Check if a value is a `HistoryEditor` object.
*/
isHistoryEditor: function isHistoryEditor(value) {
return History.isHistory(value.history) && slate.Editor.isEditor(value);
},
/**
* Get the merge flag's current value.
*/
isMerging: function isMerging(editor) {
return MERGING.get(editor);
},
/**
* Get the saving flag's current value.
*/
isSaving: function isSaving(editor) {
return SAVING.get(editor);
},
/**
* Redo to the previous saved state.
*/
redo: function redo(editor) {
editor.redo();
},
/**
* Undo to the previous saved state.
*/
undo: function undo(editor) {
editor.undo();
},
/**
* Apply a series of changes inside a synchronous `fn`, without merging any of
* the new operations into previous save point in the history.
*/
withoutMerging: function withoutMerging(editor, fn) {
var prev = HistoryEditor.isMerging(editor);
MERGING.set(editor, false);
fn();
MERGING.set(editor, prev);
},
/**
* Apply a series of changes inside a synchronous `fn`, without saving any of
* their operations into the history.
*/
withoutSaving: function withoutSaving(editor, fn) {
var prev = HistoryEditor.isSaving(editor);
SAVING.set(editor, false);
fn();
SAVING.set(editor, prev);
}
};
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; } } }; }
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); }
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; }
/**
* The `withHistory` plugin keeps track of the operation history of a Slate
* editor as operations are applied to it, using undo and redo stacks.
*
* If you are using TypeScript, you must extend Slate's CustomTypes to use
* this plugin.
*
* See https://docs.slatejs.org/concepts/11-typescript to learn how.
*/
var withHistory = function withHistory(editor) {
var e = editor;
var apply = e.apply;
e.history = {
undos: [],
redos: []
};
e.redo = function () {
var history = e.history;
var redos = history.redos;
if (redos.length > 0) {
var batch = redos[redos.length - 1];
if (batch.selectionBefore) {
slate.Transforms.setSelection(e, batch.selectionBefore);
}
HistoryEditor.withoutSaving(e, function () {
slate.Editor.withoutNormalizing(e, function () {
var _iterator = _createForOfIteratorHelper(batch.operations),
_step;
try {
for (_iterator.s(); !(_step = _iterator.n()).done;) {
var op = _step.value;
e.apply(op);
}
} catch (err) {
_iterator.e(err);
} finally {
_iterator.f();
}
});
});
history.redos.pop();
e.writeHistory('undos', batch);
}
};
e.undo = function () {
var history = e.history;
var undos = history.undos;
if (undos.length > 0) {
var batch = undos[undos.length - 1];
HistoryEditor.withoutSaving(e, function () {
slate.Editor.withoutNormalizing(e, function () {
var inverseOps = batch.operations.map(slate.Operation.inverse).reverse();
var _iterator2 = _createForOfIteratorHelper(inverseOps),
_step2;
try {
for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
var op = _step2.value;
e.apply(op);
}
} catch (err) {
_iterator2.e(err);
} finally {
_iterator2.f();
}
if (batch.selectionBefore) {
slate.Transforms.setSelection(e, batch.selectionBefore);
}
});
});
e.writeHistory('redos', batch);
history.undos.pop();
}
};
e.apply = function (op) {
var operations = e.operations,
history = e.history;
var undos = history.undos;
var lastBatch = undos[undos.length - 1];
var lastOp = lastBatch && lastBatch.operations[lastBatch.operations.length - 1];
var save = HistoryEditor.isSaving(e);
var merge = HistoryEditor.isMerging(e);
if (save == null) {
save = shouldSave(op);
}
if (save) {
if (merge == null) {
if (lastBatch == null) {
merge = false;
} else if (operations.length !== 0) {
merge = true;
} else {
merge = shouldMerge(op, lastOp);
}
}
if (lastBatch && merge) {
lastBatch.operations.push(op);
} else {
var batch = {
operations: [op],
selectionBefore: e.selection
};
e.writeHistory('undos', batch);
}
while (undos.length > 100) {
undos.shift();
}
history.redos = [];
}
apply(op);
};
e.writeHistory = function (stack, batch) {
e.history[stack].push(batch);
};
return e;
};
/**
* Check whether to merge an operation into the previous operation.
*/
var shouldMerge = function shouldMerge(op, prev) {
if (prev && op.type === 'insert_text' && prev.type === 'insert_text' && op.offset === prev.offset + prev.text.length && slate.Path.equals(op.path, prev.path)) {
return true;
}
if (prev && op.type === 'remove_text' && prev.type === 'remove_text' && op.offset + op.text.length === prev.offset && slate.Path.equals(op.path, prev.path)) {
return true;
}
return false;
};
/**
* Check whether an operation needs to be saved to the history.
*/
var shouldSave = function shouldSave(op, prev) {
if (op.type === 'set_selection') {
return false;
}
return true;
};
exports.HISTORY = HISTORY;
exports.History = History;
exports.HistoryEditor = HistoryEditor;
exports.MERGING = MERGING;
exports.SAVING = SAVING;
exports.withHistory = withHistory;
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