95 lines
3.0 KiB
JavaScript
95 lines
3.0 KiB
JavaScript
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import assignMergeValue from './_assignMergeValue.js';
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import cloneBuffer from './_cloneBuffer.js';
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import cloneTypedArray from './_cloneTypedArray.js';
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import copyArray from './_copyArray.js';
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import initCloneObject from './_initCloneObject.js';
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import isArguments from './isArguments.js';
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import isArray from './isArray.js';
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import isArrayLikeObject from './isArrayLikeObject.js';
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import isBuffer from './isBuffer.js';
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import isFunction from './isFunction.js';
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import isObject from './isObject.js';
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import isPlainObject from './isPlainObject.js';
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import isTypedArray from './isTypedArray.js';
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import safeGet from './_safeGet.js';
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import toPlainObject from './toPlainObject.js';
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/**
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* A specialized version of `baseMerge` for arrays and objects which performs
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* deep merges and tracks traversed objects enabling objects with circular
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* references to be merged.
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*
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* @private
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* @param {Object} object The destination object.
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* @param {Object} source The source object.
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* @param {string} key The key of the value to merge.
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* @param {number} srcIndex The index of `source`.
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* @param {Function} mergeFunc The function to merge values.
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* @param {Function} [customizer] The function to customize assigned values.
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* @param {Object} [stack] Tracks traversed source values and their merged
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* counterparts.
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*/
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function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
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var objValue = safeGet(object, key),
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srcValue = safeGet(source, key),
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stacked = stack.get(srcValue);
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if (stacked) {
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assignMergeValue(object, key, stacked);
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return;
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}
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var newValue = customizer
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? customizer(objValue, srcValue, (key + ''), object, source, stack)
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: undefined;
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var isCommon = newValue === undefined;
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if (isCommon) {
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var isArr = isArray(srcValue),
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isBuff = !isArr && isBuffer(srcValue),
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isTyped = !isArr && !isBuff && isTypedArray(srcValue);
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newValue = srcValue;
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if (isArr || isBuff || isTyped) {
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if (isArray(objValue)) {
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newValue = objValue;
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}
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else if (isArrayLikeObject(objValue)) {
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newValue = copyArray(objValue);
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}
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else if (isBuff) {
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isCommon = false;
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newValue = cloneBuffer(srcValue, true);
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}
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else if (isTyped) {
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isCommon = false;
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newValue = cloneTypedArray(srcValue, true);
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}
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else {
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newValue = [];
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}
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}
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else if (isPlainObject(srcValue) || isArguments(srcValue)) {
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newValue = objValue;
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if (isArguments(objValue)) {
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newValue = toPlainObject(objValue);
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}
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else if (!isObject(objValue) || isFunction(objValue)) {
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newValue = initCloneObject(srcValue);
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}
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}
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else {
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isCommon = false;
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}
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}
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if (isCommon) {
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// Recursively merge objects and arrays (susceptible to call stack limits).
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stack.set(srcValue, newValue);
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mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
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stack['delete'](srcValue);
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}
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assignMergeValue(object, key, newValue);
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}
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export default baseMergeDeep;
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