663 lines
19 KiB
JavaScript
663 lines
19 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
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exports.clone = clone;
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exports.addLast = addLast;
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exports.addFirst = addFirst;
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exports.removeLast = removeLast;
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exports.removeFirst = removeFirst;
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exports.insert = insert;
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exports.removeAt = removeAt;
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exports.replaceAt = replaceAt;
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exports.getIn = getIn;
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exports.set = set;
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exports.setIn = setIn;
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exports.update = update;
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exports.updateIn = updateIn;
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exports.merge = merge;
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exports.mergeDeep = mergeDeep;
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exports.mergeIn = mergeIn;
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exports.omit = omit;
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exports.addDefaults = addDefaults;
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/*!
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* Timm
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*
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* Immutability helpers with fast reads and acceptable writes.
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*
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* @copyright Guillermo Grau Panea 2016
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* @license MIT
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*/
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var INVALID_ARGS = 'INVALID_ARGS';
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// ===============================================
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// ### Helpers
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// ===============================================
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function throwStr(msg) {
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throw new Error(msg);
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}
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function getKeysAndSymbols(obj) {
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var keys = Object.keys(obj);
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if (Object.getOwnPropertySymbols) {
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return keys.concat(Object.getOwnPropertySymbols(obj));
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}
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return keys;
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}
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var hasOwnProperty = {}.hasOwnProperty;
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function clone(obj) {
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if (Array.isArray(obj)) return obj.slice();
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var keys = getKeysAndSymbols(obj);
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var out = {};
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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out[key] = obj[key];
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}
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return out;
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}
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function doMerge(fAddDefaults, fDeep, first) {
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var out = first;
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!(out != null) && throwStr(process.env.NODE_ENV !== 'production' ? 'At least one object should be provided to merge()' : INVALID_ARGS);
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var fChanged = false;
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for (var _len = arguments.length, rest = Array(_len > 3 ? _len - 3 : 0), _key = 3; _key < _len; _key++) {
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rest[_key - 3] = arguments[_key];
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}
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for (var idx = 0; idx < rest.length; idx++) {
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var obj = rest[idx];
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if (obj == null) continue;
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var keys = getKeysAndSymbols(obj);
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if (!keys.length) continue;
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for (var j = 0; j <= keys.length; j++) {
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var key = keys[j];
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if (fAddDefaults && out[key] !== undefined) continue;
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var nextVal = obj[key];
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if (fDeep && isObject(out[key]) && isObject(nextVal)) {
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nextVal = doMerge(fAddDefaults, fDeep, out[key], nextVal);
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}
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if (nextVal === undefined || nextVal === out[key]) continue;
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if (!fChanged) {
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fChanged = true;
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out = clone(out);
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}
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out[key] = nextVal;
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}
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}
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return out;
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}
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function isObject(o) {
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var type = typeof o === 'undefined' ? 'undefined' : _typeof(o);
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return o != null && type === 'object';
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}
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// _deepFreeze = (obj) ->
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// Object.freeze obj
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// for key in Object.getOwnPropertyNames obj
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// val = obj[key]
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// if isObject(val) and not Object.isFrozen val
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// _deepFreeze val
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// obj
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// ===============================================
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// -- ### Arrays
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// ===============================================
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// -- #### addLast()
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// -- Returns a new array with an appended item or items.
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// --
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// -- Usage: `addLast<T>(array: Array<T>, val: Array<T>|T): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = addLast(arr, 'c')
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// -- // ['a', 'b', 'c']
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// -- arr2 === arr
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// -- // false
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// -- arr3 = addLast(arr, ['c', 'd'])
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// -- // ['a', 'b', 'c', 'd']
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// -- ```
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// `array.concat(val)` also handles the scalar case,
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// but is apparently very slow
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function addLast(array, val) {
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if (Array.isArray(val)) return array.concat(val);
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return array.concat([val]);
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}
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// -- #### addFirst()
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// -- Returns a new array with a prepended item or items.
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// --
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// -- Usage: `addFirst<T>(array: Array<T>, val: Array<T>|T): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = addFirst(arr, 'c')
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// -- // ['c', 'a', 'b']
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// -- arr2 === arr
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// -- // false
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// -- arr3 = addFirst(arr, ['c', 'd'])
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// -- // ['c', 'd', 'a', 'b']
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// -- ```
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function addFirst(array, val) {
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if (Array.isArray(val)) return val.concat(array);
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return [val].concat(array);
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}
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// -- #### removeLast()
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// -- Returns a new array removing the last item.
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// --
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// -- Usage: `removeLast<T>(array: Array<T>): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = removeLast(arr)
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// -- // ['a']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- arr3 = []
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// -- removeLast(arr3) === arr3
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// -- // true
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// -- ```
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function removeLast(array) {
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if (!array.length) return array;
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return array.slice(0, array.length - 1);
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}
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// -- #### removeFirst()
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// -- Returns a new array removing the first item.
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// --
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// -- Usage: `removeFirst<T>(array: Array<T>): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = removeFirst(arr)
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// -- // ['b']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- arr3 = []
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// -- removeFirst(arr3) === arr3
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// -- // true
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// -- ```
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function removeFirst(array) {
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if (!array.length) return array;
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return array.slice(1);
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}
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// -- #### insert()
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// -- Returns a new array obtained by inserting an item or items
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// -- at a specified index.
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// --
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// -- Usage: `insert<T>(array: Array<T>, idx: number, val: Array<T>|T): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = insert(arr, 1, 'd')
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// -- // ['a', 'd', 'b', 'c']
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// -- arr2 === arr
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// -- // false
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// -- insert(arr, 1, ['d', 'e'])
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// -- // ['a', 'd', 'e', 'b', 'c']
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// -- ```
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function insert(array, idx, val) {
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return array.slice(0, idx).concat(Array.isArray(val) ? val : [val]).concat(array.slice(idx));
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}
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// -- #### removeAt()
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// -- Returns a new array obtained by removing an item at
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// -- a specified index.
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// --
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// -- Usage: `removeAt<T>(array: Array<T>, idx: number): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = removeAt(arr, 1)
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// -- // ['a', 'c']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- removeAt(arr, 4) === arr
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// -- // true
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// -- ```
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function removeAt(array, idx) {
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if (idx >= array.length || idx < 0) return array;
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return array.slice(0, idx).concat(array.slice(idx + 1));
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}
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// -- #### replaceAt()
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// -- Returns a new array obtained by replacing an item at
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// -- a specified index. If the provided item is the same as
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// -- (*referentially equal to*) the previous item at that position,
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// -- the original array is returned.
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// --
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// -- Usage: `replaceAt<T>(array: Array<T>, idx: number, newItem: T): Array<T>`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = replaceAt(arr, 1, 'd')
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// -- // ['a', 'd', 'c']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- replaceAt(arr, 1, 'b') === arr
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// -- // true
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// -- ```
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function replaceAt(array, idx, newItem) {
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if (array[idx] === newItem) return array;
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var len = array.length;
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var result = Array(len);
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for (var i = 0; i < len; i++) {
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result[i] = array[i];
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}
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result[idx] = newItem;
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return result;
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}
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// ===============================================
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// -- ### Collections (objects and arrays)
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// ===============================================
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// -- The following types are used throughout this section
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// -- ```js
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// -- type ArrayOrObject = Array<any>|Object;
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// -- type Key = number|string;
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// -- ```
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// -- #### getIn()
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// -- Returns a value from an object at a given path. Works with
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// -- nested arrays and objects. If the path does not exist, it returns
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// -- `undefined`.
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// --
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// -- Usage: `getIn(obj: ?ArrayOrObject, path: Array<Key>): any`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: ['a', 'b', 'c'] }
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// -- getIn(obj, ['d', 'd1'])
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// -- // 3
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// -- getIn(obj, ['e', 1])
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// -- // 'b'
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// -- ```
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function getIn(obj, path) {
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!Array.isArray(path) && throwStr(process.env.NODE_ENV !== 'production' ? 'A path array should be provided when calling getIn()' : INVALID_ARGS);
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if (obj == null) return undefined;
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var ptr = obj;
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for (var i = 0; i < path.length; i++) {
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var key = path[i];
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ptr = ptr != null ? ptr[key] : undefined;
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if (ptr === undefined) return ptr;
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}
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return ptr;
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}
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// -- #### set()
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// -- Returns a new object with a modified attribute.
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// -- If the provided value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `set<T>(obj: ?T, key: Key, val: any): T`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, c: 3 }
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// -- obj2 = set(obj, 'b', 5)
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// -- // { a: 1, b: 5, c: 3 }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- set(obj, 'b', 2) === obj
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// -- // true
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// -- ```
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function set(obj, key, val) {
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var fallback = typeof key === 'number' ? [] : {};
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var finalObj = obj == null ? fallback : obj;
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if (finalObj[key] === val) return finalObj;
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var obj2 = clone(finalObj);
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obj2[key] = val;
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return obj2;
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}
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// -- #### setIn()
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// -- Returns a new object with a modified **nested** attribute.
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// --
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// -- Notes:
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// --
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// -- * If the provided value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// -- * If the path does not exist, it will be created before setting
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// -- the new value.
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// --
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// -- Usage: `setIn<T: ArrayOrObject>(obj: T, path: Array<Key>, val: any): T`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj2 = setIn(obj, ['d', 'd1'], 4)
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// -- // { a: 1, b: 2, d: { d1: 4, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj2 === obj
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// -- // false
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// -- obj2.d === obj.d
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// -- // false
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// -- obj2.e === obj.e
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// -- // true
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// --
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// -- // The same object is returned if there are no changes:
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// -- obj3 = setIn(obj, ['d', 'd1'], 3)
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// -- // { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj3 === obj
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// -- // true
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// -- obj3.d === obj.d
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// -- // true
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// -- obj3.e === obj.e
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// -- // true
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// --
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// -- // ... unknown paths create intermediate keys. Numeric segments are treated as array indices:
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// -- setIn({ a: 3 }, ['unknown', 0, 'path'], 4)
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// -- // { a: 3, unknown: [{ path: 4 }] }
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// -- ```
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function doSetIn(obj, path, val, idx) {
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var newValue = void 0;
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var key = path[idx];
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if (idx === path.length - 1) {
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newValue = val;
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} else {
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var nestedObj = isObject(obj) && isObject(obj[key]) ? obj[key] : typeof path[idx + 1] === 'number' ? [] : {};
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newValue = doSetIn(nestedObj, path, val, idx + 1);
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}
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return set(obj, key, newValue);
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}
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function setIn(obj, path, val) {
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if (!path.length) return val;
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return doSetIn(obj, path, val, 0);
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}
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// -- #### update()
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// -- Returns a new object with a modified attribute,
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// -- calculated via a user-provided callback based on the current value.
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// -- If the calculated value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `update<T: ArrayOrObject>(obj: T, key: Key,
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// -- fnUpdate: (prevValue: any) => any): T`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, c: 3 }
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// -- obj2 = update(obj, 'b', (val) => val + 1)
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// -- // { a: 1, b: 3, c: 3 }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- update(obj, 'b', (val) => val) === obj
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// -- // true
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// -- ```
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function update(obj, key, fnUpdate) {
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var prevVal = obj == null ? undefined : obj[key];
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var nextVal = fnUpdate(prevVal);
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return set(obj, key, nextVal);
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}
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// -- #### updateIn()
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// -- Returns a new object with a modified **nested** attribute,
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// -- calculated via a user-provided callback based on the current value.
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// -- If the calculated value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `updateIn<T: ArrayOrObject>(obj: T, path: Array<Key>,
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// -- fnUpdate: (prevValue: any) => any): T`
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// --
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// -- ```js
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// -- obj = { a: 1, d: { d1: 3, d2: 4 } }
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// -- obj2 = updateIn(obj, ['d', 'd1'], (val) => val + 1)
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// -- // { a: 1, d: { d1: 4, d2: 4 } }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- obj3 = updateIn(obj, ['d', 'd1'], (val) => val)
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// -- // { a: 1, d: { d1: 3, d2: 4 } }
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// -- obj3 === obj
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// -- // true
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// -- ```
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function updateIn(obj, path, fnUpdate) {
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var prevVal = getIn(obj, path);
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var nextVal = fnUpdate(prevVal);
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return setIn(obj, path, nextVal);
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}
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// -- #### merge()
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// -- Returns a new object built as follows: the overlapping keys from the
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// -- second one overwrite the corresponding entries from the first one.
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// -- Similar to `Object.assign()`, but immutable.
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// --
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// -- Usage:
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// --
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// -- * `merge(obj1: Object, obj2: ?Object): Object`
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// -- * `merge(obj1: Object, ...objects: Array<?Object>): Object`
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// --
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// -- The unmodified `obj1` is returned if `obj2` does not *provide something
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// -- new to* `obj1`, i.e. if either of the following
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// -- conditions are true:
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// --
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// -- * `obj2` is `null` or `undefined`
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// -- * `obj2` is an object, but it is empty
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// -- * All attributes of `obj2` are `undefined`
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// -- * All attributes of `obj2` are referentially equal to the
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// -- corresponding attributes of `obj1`
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// --
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// -- Note that `undefined` attributes in `obj2` do not modify the
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// -- corresponding attributes in `obj1`.
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// --
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// -- ```js
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// -- obj1 = { a: 1, b: 2, c: 3 }
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// -- obj2 = { c: 4, d: 5 }
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// -- obj3 = merge(obj1, obj2)
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// -- // { a: 1, b: 2, c: 4, d: 5 }
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// -- obj3 === obj1
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- merge(obj1, { c: 3 }) === obj1
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// -- // true
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// -- ```
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function merge(a, b, c, d, e, f) {
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for (var _len2 = arguments.length, rest = Array(_len2 > 6 ? _len2 - 6 : 0), _key2 = 6; _key2 < _len2; _key2++) {
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rest[_key2 - 6] = arguments[_key2];
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}
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return rest.length ? doMerge.call.apply(doMerge, [null, false, false, a, b, c, d, e, f].concat(rest)) : doMerge(false, false, a, b, c, d, e, f);
|
|
}
|
|
|
|
// -- #### mergeDeep()
|
|
// -- Returns a new object built as follows: the overlapping keys from the
|
|
// -- second one overwrite the corresponding entries from the first one.
|
|
// -- If both the first and second entries are objects they are merged recursively.
|
|
// -- Similar to `Object.assign()`, but immutable, and deeply merging.
|
|
// --
|
|
// -- Usage:
|
|
// --
|
|
// -- * `mergeDeep(obj1: Object, obj2: ?Object): Object`
|
|
// -- * `mergeDeep(obj1: Object, ...objects: Array<?Object>): Object`
|
|
// --
|
|
// -- The unmodified `obj1` is returned if `obj2` does not *provide something
|
|
// -- new to* `obj1`, i.e. if either of the following
|
|
// -- conditions are true:
|
|
// --
|
|
// -- * `obj2` is `null` or `undefined`
|
|
// -- * `obj2` is an object, but it is empty
|
|
// -- * All attributes of `obj2` are `undefined`
|
|
// -- * All attributes of `obj2` are referentially equal to the
|
|
// -- corresponding attributes of `obj1`
|
|
// --
|
|
// -- Note that `undefined` attributes in `obj2` do not modify the
|
|
// -- corresponding attributes in `obj1`.
|
|
// --
|
|
// -- ```js
|
|
// -- obj1 = { a: 1, b: 2, c: { a: 1 } }
|
|
// -- obj2 = { b: 3, c: { b: 2 } }
|
|
// -- obj3 = mergeDeep(obj1, obj2)
|
|
// -- // { a: 1, b: 3, c: { a: 1, b: 2 } }
|
|
// -- obj3 === obj1
|
|
// -- // false
|
|
// --
|
|
// -- // The same object is returned if there are no changes:
|
|
// -- mergeDeep(obj1, { c: { a: 1 } }) === obj1
|
|
// -- // true
|
|
// -- ```
|
|
function mergeDeep(a, b, c, d, e, f) {
|
|
for (var _len3 = arguments.length, rest = Array(_len3 > 6 ? _len3 - 6 : 0), _key3 = 6; _key3 < _len3; _key3++) {
|
|
rest[_key3 - 6] = arguments[_key3];
|
|
}
|
|
|
|
return rest.length ? doMerge.call.apply(doMerge, [null, false, true, a, b, c, d, e, f].concat(rest)) : doMerge(false, true, a, b, c, d, e, f);
|
|
}
|
|
|
|
// -- #### mergeIn()
|
|
// -- Similar to `merge()`, but merging the value at a given nested path.
|
|
// -- Note that the returned type is the same as that of the first argument.
|
|
// --
|
|
// -- Usage:
|
|
// --
|
|
// -- * `mergeIn<T: ArrayOrObject>(obj1: T, path: Array<Key>, obj2: ?Object): T`
|
|
// -- * `mergeIn<T: ArrayOrObject>(obj1: T, path: Array<Key>,
|
|
// -- ...objects: Array<?Object>): T`
|
|
// --
|
|
// -- ```js
|
|
// -- obj1 = { a: 1, d: { b: { d1: 3, d2: 4 } } }
|
|
// -- obj2 = { d3: 5 }
|
|
// -- obj3 = mergeIn(obj1, ['d', 'b'], obj2)
|
|
// -- // { a: 1, d: { b: { d1: 3, d2: 4, d3: 5 } } }
|
|
// -- obj3 === obj1
|
|
// -- // false
|
|
// --
|
|
// -- // The same object is returned if there are no changes:
|
|
// -- mergeIn(obj1, ['d', 'b'], { d2: 4 }) === obj1
|
|
// -- // true
|
|
// -- ```
|
|
function mergeIn(a, path, b, c, d, e, f) {
|
|
var prevVal = getIn(a, path);
|
|
if (prevVal == null) prevVal = {};
|
|
var nextVal = void 0;
|
|
|
|
for (var _len4 = arguments.length, rest = Array(_len4 > 7 ? _len4 - 7 : 0), _key4 = 7; _key4 < _len4; _key4++) {
|
|
rest[_key4 - 7] = arguments[_key4];
|
|
}
|
|
|
|
if (rest.length) {
|
|
nextVal = doMerge.call.apply(doMerge, [null, false, false, prevVal, b, c, d, e, f].concat(rest));
|
|
} else {
|
|
nextVal = doMerge(false, false, prevVal, b, c, d, e, f);
|
|
}
|
|
return setIn(a, path, nextVal);
|
|
}
|
|
|
|
// -- #### omit()
|
|
// -- Returns an object excluding one or several attributes.
|
|
// --
|
|
// -- Usage: `omit(obj: Object, attrs: Array<string>|string): Object`
|
|
//
|
|
// -- ```js
|
|
// -- obj = { a: 1, b: 2, c: 3, d: 4 }
|
|
// -- omit(obj, 'a')
|
|
// -- // { b: 2, c: 3, d: 4 }
|
|
// -- omit(obj, ['b', 'c'])
|
|
// -- // { a: 1, d: 4 }
|
|
// --
|
|
// -- // The same object is returned if there are no changes:
|
|
// -- omit(obj, 'z') === obj1
|
|
// -- // true
|
|
// -- ```
|
|
function omit(obj, attrs) {
|
|
var omitList = Array.isArray(attrs) ? attrs : [attrs];
|
|
var fDoSomething = false;
|
|
for (var i = 0; i < omitList.length; i++) {
|
|
if (hasOwnProperty.call(obj, omitList[i])) {
|
|
fDoSomething = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!fDoSomething) return obj;
|
|
var out = {};
|
|
var keys = getKeysAndSymbols(obj);
|
|
for (var _i = 0; _i < keys.length; _i++) {
|
|
var key = keys[_i];
|
|
if (omitList.indexOf(key) >= 0) continue;
|
|
out[key] = obj[key];
|
|
}
|
|
return out;
|
|
}
|
|
|
|
// -- #### addDefaults()
|
|
// -- Returns a new object built as follows: `undefined` keys in the first one
|
|
// -- are filled in with the corresponding values from the second one
|
|
// -- (even if they are `null`).
|
|
// --
|
|
// -- Usage:
|
|
// --
|
|
// -- * `addDefaults(obj: Object, defaults: Object): Object`
|
|
// -- * `addDefaults(obj: Object, ...defaultObjects: Array<?Object>): Object`
|
|
// --
|
|
// -- ```js
|
|
// -- obj1 = { a: 1, b: 2, c: 3 }
|
|
// -- obj2 = { c: 4, d: 5, e: null }
|
|
// -- obj3 = addDefaults(obj1, obj2)
|
|
// -- // { a: 1, b: 2, c: 3, d: 5, e: null }
|
|
// -- obj3 === obj1
|
|
// -- // false
|
|
// --
|
|
// -- // The same object is returned if there are no changes:
|
|
// -- addDefaults(obj1, { c: 4 }) === obj1
|
|
// -- // true
|
|
// -- ```
|
|
function addDefaults(a, b, c, d, e, f) {
|
|
for (var _len5 = arguments.length, rest = Array(_len5 > 6 ? _len5 - 6 : 0), _key5 = 6; _key5 < _len5; _key5++) {
|
|
rest[_key5 - 6] = arguments[_key5];
|
|
}
|
|
|
|
return rest.length ? doMerge.call.apply(doMerge, [null, true, false, a, b, c, d, e, f].concat(rest)) : doMerge(true, false, a, b, c, d, e, f);
|
|
}
|
|
|
|
// ===============================================
|
|
// ### Public API
|
|
// ===============================================
|
|
var timm = {
|
|
clone: clone,
|
|
addLast: addLast,
|
|
addFirst: addFirst,
|
|
removeLast: removeLast,
|
|
removeFirst: removeFirst,
|
|
insert: insert,
|
|
removeAt: removeAt,
|
|
replaceAt: replaceAt,
|
|
|
|
getIn: getIn,
|
|
// eslint-disable-next-line object-shorthand
|
|
set: set, // so that flow doesn't complain
|
|
setIn: setIn,
|
|
update: update,
|
|
updateIn: updateIn,
|
|
merge: merge,
|
|
mergeDeep: mergeDeep,
|
|
mergeIn: mergeIn,
|
|
omit: omit,
|
|
addDefaults: addDefaults
|
|
};
|
|
|
|
exports.default = timm;
|