| 'use strict'; |
| const isObj = require('is-obj'); |
| |
| function getPathSegments(path) { |
| const pathArr = path.split('.'); |
| const parts = []; |
| |
| for (let i = 0; i < pathArr.length; i++) { |
| let p = pathArr[i]; |
| |
| while (p[p.length - 1] === '\\' && pathArr[i + 1] !== undefined) { |
| p = p.slice(0, -1) + '.'; |
| p += pathArr[++i]; |
| } |
| |
| parts.push(p); |
| } |
| |
| return parts; |
| } |
| |
| module.exports = { |
| get(obj, path, value) { |
| if (!isObj(obj) || typeof path !== 'string') { |
| return value === undefined ? obj : value; |
| } |
| |
| const pathArr = getPathSegments(path); |
| |
| for (let i = 0; i < pathArr.length; i++) { |
| if (!Object.prototype.propertyIsEnumerable.call(obj, pathArr[i])) { |
| return value; |
| } |
| |
| obj = obj[pathArr[i]]; |
| |
| if (obj === undefined || obj === null) { |
| // `obj` is either `undefined` or `null` so we want to stop the loop, and |
| // if this is not the last bit of the path, and |
| // if it did't return `undefined` |
| // it would return `null` if `obj` is `null` |
| // but we want `get({foo: null}, 'foo.bar')` to equal `undefined`, or the supplied value, not `null` |
| if (i !== pathArr.length - 1) { |
| return value; |
| } |
| |
| break; |
| } |
| } |
| |
| return obj; |
| }, |
| |
| set(obj, path, value) { |
| if (!isObj(obj) || typeof path !== 'string') { |
| return obj; |
| } |
| |
| const root = obj; |
| const pathArr = getPathSegments(path); |
| |
| for (let i = 0; i < pathArr.length; i++) { |
| const p = pathArr[i]; |
| |
| if (!isObj(obj[p])) { |
| obj[p] = {}; |
| } |
| |
| if (i === pathArr.length - 1) { |
| obj[p] = value; |
| } |
| |
| obj = obj[p]; |
| } |
| |
| return root; |
| }, |
| |
| delete(obj, path) { |
| if (!isObj(obj) || typeof path !== 'string') { |
| return; |
| } |
| |
| const pathArr = getPathSegments(path); |
| |
| for (let i = 0; i < pathArr.length; i++) { |
| const p = pathArr[i]; |
| |
| if (i === pathArr.length - 1) { |
| delete obj[p]; |
| return; |
| } |
| |
| obj = obj[p]; |
| |
| if (!isObj(obj)) { |
| return; |
| } |
| } |
| }, |
| |
| has(obj, path) { |
| if (!isObj(obj) || typeof path !== 'string') { |
| return false; |
| } |
| |
| const pathArr = getPathSegments(path); |
| |
| for (let i = 0; i < pathArr.length; i++) { |
| if (isObj(obj)) { |
| if (!(pathArr[i] in obj)) { |
| return false; |
| } |
| |
| obj = obj[pathArr[i]]; |
| } else { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| }; |