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index.js
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index.js
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var identity = function(_){ return _; };
/**
* Module exports, export
*/
module.exports = multiple(find);
module.exports.find = module.exports;
/**
* Export the replacement function, return the modified object
*/
module.exports.replace = function (obj, key, val, options) {
multiple(replace).call(this, obj, key, val, options);
return obj;
};
/**
* Export the delete function, return the modified object
*/
module.exports.del = function (obj, key, options) {
multiple(del).call(this, obj, key, null, options);
return obj;
};
/**
* Compose applying the function to a nested key
*/
function multiple (fn) {
return function (obj, path, val, options) {
var normalize = options && isFunction(options.normalizer) ? options.normalizer : defaultNormalize;
path = normalize(path);
var key;
var finished = false;
while (!finished) loop();
function loop() {
for (key in obj) {
var normalizedKey = normalize(key);
if (0 === path.indexOf(normalizedKey)) {
var temp = path.substr(normalizedKey.length);
if (temp.charAt(0) === '.' || temp.length === 0) {
path = temp.substr(1);
var child = obj[key];
// we're at the end and there is nothing.
if (null == child) {
finished = true;
return;
}
// we're at the end and there is something.
if (!path.length) {
finished = true;
return;
}
// step into child
obj = child;
// but we're done here
return;
}
}
}
key = undefined;
// if we found no matching properties
// on the current object, there's no match.
finished = true;
}
if (!key) return;
if (null == obj) return obj;
// the `obj` and `key` is one above the leaf object and key, so
// start object: { a: { 'b.c': 10 } }
// end object: { 'b.c': 10 }
// end key: 'b.c'
// this way, you can do `obj[key]` and get `10`.
return fn(obj, key, val);
};
}
/**
* Find an object by its key
*
* find({ first_name : 'Calvin' }, 'firstName')
*/
function find (obj, key) {
if (obj.hasOwnProperty(key)) return obj[key];
}
/**
* Delete a value for a given key
*
* del({ a : 'b', x : 'y' }, 'X' }) -> { a : 'b' }
*/
function del (obj, key) {
if (obj.hasOwnProperty(key)) delete obj[key];
return obj;
}
/**
* Replace an objects existing value with a new one
*
* replace({ a : 'b' }, 'a', 'c') -> { a : 'c' }
*/
function replace (obj, key, val) {
if (obj.hasOwnProperty(key)) obj[key] = val;
return obj;
}
/**
* Normalize a `dot.separated.path`.
*
* A.HELL(!*&#(!)O_WOR LD.bar => ahelloworldbar
*
* @param {String} path
* @return {String}
*/
function defaultNormalize(path) {
return path.replace(/[^a-zA-Z0-9\.]+/g, '').toLowerCase();
}
/**
* Check if a value is a function.
*
* @param {*} val
* @return {boolean} Returns `true` if `val` is a function, otherwise `false`.
*/
function isFunction(val) {
return typeof val === 'function';
}