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var assignMergeValue = require('./_assignMergeValue'),
baseClone = require('./_baseClone'),
copyArray = require('./_copyArray'),
isArguments = require('./isArguments'),
isArray = require('./isArray'),
isArrayLikeObject = require('./isArrayLikeObject'),
isFunction = require('./isFunction'),
isObject = require('./isObject'),
isPlainObject = require('./isPlainObject'),
isTypedArray = require('./isTypedArray'),
toPlainObject = require('./toPlainObject');
/**
* A specialized version of `baseMerge` for arrays and objects which performs
* deep merges and tracks traversed objects enabling objects with circular
* references to be merged.
*
* @private
* @param {Object} object The destination object.
* @param {Object} source The source object.
* @param {string} key The key of the value to merge.
* @param {number} srcIndex The index of `source`.
* @param {Function} mergeFunc The function to merge values.
* @param {Function} [customizer] The function to customize assigned values.
* @param {Object} [stack] Tracks traversed source values and their merged
* counterparts.
*/
function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
var objValue = object[key],
srcValue = source[key],
stacked = stack.get(srcValue);
if (stacked) {
assignMergeValue(object, key, stacked);
return;
}
var newValue = customizer
? customizer(objValue, srcValue, (key + ''), object, source, stack)
: undefined;
var isCommon = newValue === undefined;
if (isCommon) {
newValue = srcValue;
if (isArray(srcValue) || isTypedArray(srcValue)) {
if (isArray(objValue)) {
newValue = objValue;
}
else if (isArrayLikeObject(objValue)) {
newValue = copyArray(objValue);
}
else {
isCommon = false;
newValue = baseClone(srcValue, true);
}
}
else if (isPlainObject(srcValue) || isArguments(srcValue)) {
if (isArguments(objValue)) {
newValue = toPlainObject(objValue);
}
else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
isCommon = false;
newValue = baseClone(srcValue, true);
}
else {
newValue = objValue;
}
}
else {
isCommon = false;
}
}
stack.set(srcValue, newValue);
if (isCommon) {
// Recursively merge objects and arrays (susceptible to call stack limits).
mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
}
stack['delete'](srcValue);
assignMergeValue(object, key, newValue);
}
module.exports = baseMergeDeep;