139 lines
2.6 KiB
JavaScript
139 lines
2.6 KiB
JavaScript
'use strict';
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const isObj = require('is-obj');
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const disallowedKeys = new Set([
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'__proto__',
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'prototype',
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'constructor'
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]);
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const isValidPath = pathSegments => !pathSegments.some(segment => disallowedKeys.has(segment));
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function getPathSegments(path) {
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const pathArray = path.split('.');
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const parts = [];
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for (let i = 0; i < pathArray.length; i++) {
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let p = pathArray[i];
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while (p[p.length - 1] === '\\' && pathArray[i + 1] !== undefined) {
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p = p.slice(0, -1) + '.';
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p += pathArray[++i];
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}
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parts.push(p);
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}
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if (!isValidPath(parts)) {
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return [];
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}
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return parts;
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}
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module.exports = {
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get(object, path, value) {
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if (!isObj(object) || typeof path !== 'string') {
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return value === undefined ? object : value;
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}
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const pathArray = getPathSegments(path);
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if (pathArray.length === 0) {
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return;
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}
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for (let i = 0; i < pathArray.length; i++) {
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object = object[pathArray[i]];
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if (object === undefined || object === null) {
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// `object` is either `undefined` or `null` so we want to stop the loop, and
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// if this is not the last bit of the path, and
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// if it did't return `undefined`
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// it would return `null` if `object` is `null`
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// but we want `get({foo: null}, 'foo.bar')` to equal `undefined`, or the supplied value, not `null`
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if (i !== pathArray.length - 1) {
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return value;
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}
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break;
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}
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}
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return object === undefined ? value : object;
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},
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set(object, path, value) {
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if (!isObj(object) || typeof path !== 'string') {
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return object;
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}
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const root = object;
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const pathArray = getPathSegments(path);
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for (let i = 0; i < pathArray.length; i++) {
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const p = pathArray[i];
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if (!isObj(object[p])) {
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object[p] = {};
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}
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if (i === pathArray.length - 1) {
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object[p] = value;
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}
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object = object[p];
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}
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return root;
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},
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delete(object, path) {
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if (!isObj(object) || typeof path !== 'string') {
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return false;
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}
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const pathArray = getPathSegments(path);
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for (let i = 0; i < pathArray.length; i++) {
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const p = pathArray[i];
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if (i === pathArray.length - 1) {
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delete object[p];
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return true;
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}
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object = object[p];
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if (!isObj(object)) {
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return false;
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}
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}
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},
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has(object, path) {
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if (!isObj(object) || typeof path !== 'string') {
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return false;
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}
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const pathArray = getPathSegments(path);
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if (pathArray.length === 0) {
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return false;
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}
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// eslint-disable-next-line unicorn/no-for-loop
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for (let i = 0; i < pathArray.length; i++) {
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if (isObj(object)) {
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if (!(pathArray[i] in object)) {
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return false;
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}
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object = object[pathArray[i]];
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} else {
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return false;
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}
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}
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return true;
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}
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};
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