WordPress/wp-includes/js/dist/undo-manager.js

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/******/ (function() { // webpackBootstrap
/******/ "use strict";
/******/ var __webpack_modules__ = ({
/***/ 9127:
/***/ (function(module) {
module.exports = window["wp"]["isShallowEqual"];
/***/ })
/******/ });
/************************************************************************/
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/******/ /* webpack/runtime/compat get default export */
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/******/ var getter = module && module.__esModule ?
/******/ function() { return module['default']; } :
/******/ function() { return module; };
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/************************************************************************/
var __webpack_exports__ = {};
// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
!function() {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ createUndoManager: function() { return /* binding */ createUndoManager; }
/* harmony export */ });
/* harmony import */ var _wordpress_is_shallow_equal__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(9127);
/* harmony import */ var _wordpress_is_shallow_equal__WEBPACK_IMPORTED_MODULE_0___default = /*#__PURE__*/__webpack_require__.n(_wordpress_is_shallow_equal__WEBPACK_IMPORTED_MODULE_0__);
/**
* WordPress dependencies
*/
/** @typedef {import('./types').HistoryRecord} HistoryRecord */
/** @typedef {import('./types').HistoryChange} HistoryChange */
/** @typedef {import('./types').HistoryChanges} HistoryChanges */
/** @typedef {import('./types').UndoManager} UndoManager */
/**
* Merge changes for a single item into a record of changes.
*
* @param {Record< string, HistoryChange >} changes1 Previous changes
* @param {Record< string, HistoryChange >} changes2 NextChanges
*
* @return {Record< string, HistoryChange >} Merged changes
*/
function mergeHistoryChanges(changes1, changes2) {
/**
* @type {Record< string, HistoryChange >}
*/
const newChanges = {
...changes1
};
Object.entries(changes2).forEach(([key, value]) => {
if (newChanges[key]) {
newChanges[key] = {
...newChanges[key],
to: value.to
};
} else {
newChanges[key] = value;
}
});
return newChanges;
}
/**
* Adds history changes for a single item into a record of changes.
*
* @param {HistoryRecord} record The record to merge into.
* @param {HistoryChanges} changes The changes to merge.
*/
const addHistoryChangesIntoRecord = (record, changes) => {
const existingChangesIndex = record?.findIndex(({
id: recordIdentifier
}) => {
return typeof recordIdentifier === 'string' ? recordIdentifier === changes.id : _wordpress_is_shallow_equal__WEBPACK_IMPORTED_MODULE_0___default()(recordIdentifier, changes.id);
});
const nextRecord = [...record];
if (existingChangesIndex !== -1) {
// If the edit is already in the stack leave the initial "from" value.
nextRecord[existingChangesIndex] = {
id: changes.id,
changes: mergeHistoryChanges(nextRecord[existingChangesIndex].changes, changes.changes)
};
} else {
nextRecord.push(changes);
}
return nextRecord;
};
/**
* Creates an undo manager.
*
* @return {UndoManager} Undo manager.
*/
function createUndoManager() {
/**
* @type {HistoryRecord[]}
*/
let history = [];
/**
* @type {HistoryRecord}
*/
let stagedRecord = [];
/**
* @type {number}
*/
let offset = 0;
const dropPendingRedos = () => {
history = history.slice(0, offset || undefined);
offset = 0;
};
const appendStagedRecordToLatestHistoryRecord = () => {
var _history$index;
const index = history.length === 0 ? 0 : history.length - 1;
let latestRecord = (_history$index = history[index]) !== null && _history$index !== void 0 ? _history$index : [];
stagedRecord.forEach(changes => {
latestRecord = addHistoryChangesIntoRecord(latestRecord, changes);
});
stagedRecord = [];
history[index] = latestRecord;
};
/**
* Checks whether a record is empty.
* A record is considered empty if it the changes keep the same values.
* Also updates to function values are ignored.
*
* @param {HistoryRecord} record
* @return {boolean} Whether the record is empty.
*/
const isRecordEmpty = record => {
const filteredRecord = record.filter(({
changes
}) => {
return Object.values(changes).some(({
from,
to
}) => typeof from !== 'function' && typeof to !== 'function' && !_wordpress_is_shallow_equal__WEBPACK_IMPORTED_MODULE_0___default()(from, to));
});
return !filteredRecord.length;
};
return {
/**
* Record changes into the history.
*
* @param {HistoryRecord=} record A record of changes to record.
* @param {boolean} isStaged Whether to immediately create an undo point or not.
*/
addRecord(record, isStaged = false) {
const isEmpty = !record || isRecordEmpty(record);
if (isStaged) {
if (isEmpty) {
return;
}
record.forEach(changes => {
stagedRecord = addHistoryChangesIntoRecord(stagedRecord, changes);
});
} else {
dropPendingRedos();
if (stagedRecord.length) {
appendStagedRecordToLatestHistoryRecord();
}
if (isEmpty) {
return;
}
history.push(record);
}
},
undo() {
if (stagedRecord.length) {
dropPendingRedos();
appendStagedRecordToLatestHistoryRecord();
}
const undoRecord = history[history.length - 1 + offset];
if (!undoRecord) {
return;
}
offset -= 1;
return undoRecord;
},
redo() {
const redoRecord = history[history.length + offset];
if (!redoRecord) {
return;
}
offset += 1;
return redoRecord;
},
hasUndo() {
return !!history[history.length - 1 + offset];
},
hasRedo() {
return !!history[history.length + offset];
}
};
}
}();
(window.wp = window.wp || {}).undoManager = __webpack_exports__;
/******/ })()
;