Created
September 17, 2012 19:07
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string2path by Ben Alman
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/* | |
* 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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