61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
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/*
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* getobject
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* https://github.com/cowboy/node-getobject
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*
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* Copyright (c) 2013 "Cowboy" Ben Alman
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* Licensed under the MIT license.
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*/
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'use strict';
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var getobject = module.exports = {};
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// Split strings on dot, but only if dot isn't preceded by a backslash. Since
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// JavaScript doesn't support lookbehinds, use a placeholder for "\.", split
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// on dot, then replace the placeholder character with a dot.
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function getParts(str) {
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return str.replace(/\\\./g, '\uffff').split('.').map(function(s) {
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return s.replace(/\uffff/g, '.');
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});
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}
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// Get the value of a deeply-nested property exist in an object.
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getobject.get = function(obj, parts, create) {
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if (typeof parts === 'string') {
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parts = getParts(parts);
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}
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var part;
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while (typeof obj === 'object' && obj && parts.length) {
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part = parts.shift();
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if (!(part in obj) && create) {
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obj[part] = {};
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}
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obj = obj[part];
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}
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return obj;
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};
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// Set a deeply-nested property in an object, creating intermediary objects
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// as we go.
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getobject.set = function(obj, parts, value) {
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parts = getParts(parts);
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var prop = parts.pop();
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obj = getobject.get(obj, parts, true);
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if (obj && typeof obj === 'object') {
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return (obj[prop] = value);
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}
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};
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// Does a deeply-nested property exist in an object?
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getobject.exists = function(obj, parts) {
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parts = getParts(parts);
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var prop = parts.pop();
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obj = getobject.get(obj, parts);
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return typeof obj === 'object' && obj && prop in obj;
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};
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