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string2path by Ben Alman
/*
* grunt
* http://gruntjs.com/
*
* Copyright (c) 2012 "Cowboy" Ben Alman
* Licensed under the MIT license.
* http://benalman.com/about/license/
*/
(function(exports) {
'use strict';
// Split strings on dot, but only if dot isn't preceded by a backslash. Since
// JavaScript doesn't support lookbehinds, use a placeholder for "\.", split
// on dot, then replace the placeholder character with a dot.
function getParts(str) {
return str.replace(/\\\./g, '\uffff').split('.').map(function(s) {
return s.replace(/\uffff/g, '.');
});
}
// Get the value of a deeply-nested property exist in an object.
exports.get = function(obj, parts, create) {
if (typeof parts === 'string') {
parts = getParts(parts);
}
var part;
while (typeof obj === 'object' && obj && parts.length) {
part = parts.shift();
if (!(part in obj) && create) {
obj[part] = {};
}
obj = obj[part];
}
return obj;
};
// Set a deeply-nested property in an object, creating intermediary objects
// as we go.
exports.set = function(obj, parts, value) {
parts = getParts(parts);
var prop = parts.pop();
obj = exports.get(obj, parts, true);
if (obj && typeof obj === 'object') {
return (obj[prop] = value);
}
};
// Does a deeply-nested property exist in an object?
exports.exists = function(obj, parts) {
parts = getParts(parts);
var prop = parts.pop();
obj = exports.get(obj, parts);
return typeof obj === 'object' && obj && prop in obj;
};
}(typeof exports === 'object' && exports || this));
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