43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
|
var _setup = require('./_setup.js');
|
||
|
|
var isFunction = require('./isFunction.js');
|
||
|
|
var _has = require('./_has.js');
|
||
|
|
|
||
|
|
// Internal helper to create a simple lookup structure.
|
||
|
|
// `collectNonEnumProps` used to depend on `_.contains`, but this led to
|
||
|
|
// circular imports. `emulatedSet` is a one-off solution that only works for
|
||
|
|
// arrays of strings.
|
||
|
|
function emulatedSet(keys) {
|
||
|
|
var hash = {};
|
||
|
|
for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
|
||
|
|
return {
|
||
|
|
contains: function(key) { return hash[key] === true; },
|
||
|
|
push: function(key) {
|
||
|
|
hash[key] = true;
|
||
|
|
return keys.push(key);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
|
||
|
|
// be iterated by `for key in ...` and thus missed. Extends `keys` in place if
|
||
|
|
// needed.
|
||
|
|
function collectNonEnumProps(obj, keys) {
|
||
|
|
keys = emulatedSet(keys);
|
||
|
|
var nonEnumIdx = _setup.nonEnumerableProps.length;
|
||
|
|
var constructor = obj.constructor;
|
||
|
|
var proto = (isFunction(constructor) && constructor.prototype) || _setup.ObjProto;
|
||
|
|
|
||
|
|
// Constructor is a special case.
|
||
|
|
var prop = 'constructor';
|
||
|
|
if (_has(obj, prop) && !keys.contains(prop)) keys.push(prop);
|
||
|
|
|
||
|
|
while (nonEnumIdx--) {
|
||
|
|
prop = _setup.nonEnumerableProps[nonEnumIdx];
|
||
|
|
if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
|
||
|
|
keys.push(prop);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = collectNonEnumProps;
|