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'use strict';
var isArray = require('core-js/library/fn/array/is-array');
var objectKeys = require('core-js/library/fn/object/keys');
var indexOf = require('core-js/library/fn/array/index-of');
var reduce = require('core-js/library/fn/array/reduce');
module.exports = function cloneWithWhitelist (astWhiteList) {
var whitelist = reduce(objectKeys(astWhiteList), function (props, key) {
var propNames = astWhiteList[key];
var prepend = (indexOf(propNames, 'type') === -1) ? ['type'] : [];
props[key] = prepend.concat(propNames);
return props;
}, {});
function cloneNodeOrObject (obj) {
var props = obj.type ? whitelist[obj.type] : null;
if (props) {
return cloneNode(obj, props);
} else {
return cloneObject(obj);
}
}
function cloneArray (ary) {
var i = ary.length, clone = [];
while (i--) {
clone[i] = cloneOf(ary[i]);
}
return clone;
}
function cloneNode (node, props) {
var i, len, key, clone = {};
for (i = 0, len = props.length; i < len; i += 1) {
key = props[i];
if (node.hasOwnProperty(key)) {
clone[key] = cloneOf(node[key]);
}
}
return clone;
}
function cloneObject (obj) {
var props = objectKeys(obj);
var i, len, key, clone = {};
for (i = 0, len = props.length; i < len; i += 1) {
key = props[i];
clone[key] = cloneOf(obj[key]);
}
return clone;
}
function cloneOf (val) {
if (typeof val === 'object' && val !== null) {
if (val instanceof RegExp) {
return new RegExp(val);
} else if (isArray(val)) {
return cloneArray(val);
} else {
return cloneNodeOrObject(val);
}
} else {
return val;
}
}
return cloneNodeOrObject;
};
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