83 lines
2.6 KiB
JavaScript
83 lines
2.6 KiB
JavaScript
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;
|
|
}
|
|
}
|
|
if (isCommon) {
|
|
// Recursively merge objects and arrays (susceptible to call stack limits).
|
|
stack.set(srcValue, newValue);
|
|
mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
|
|
stack['delete'](srcValue);
|
|
}
|
|
assignMergeValue(object, key, newValue);
|
|
}
|
|
|
|
module.exports = baseMergeDeep;
|