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'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;
}
};