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95 lines
3.0 KiB
JavaScript
95 lines
3.0 KiB
JavaScript
5 years ago
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var assignMergeValue = require('./_assignMergeValue'),
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cloneBuffer = require('./_cloneBuffer'),
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cloneTypedArray = require('./_cloneTypedArray'),
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copyArray = require('./_copyArray'),
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initCloneObject = require('./_initCloneObject'),
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isArguments = require('./isArguments'),
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isArray = require('./isArray'),
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isArrayLikeObject = require('./isArrayLikeObject'),
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isBuffer = require('./isBuffer'),
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isFunction = require('./isFunction'),
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isObject = require('./isObject'),
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isPlainObject = require('./isPlainObject'),
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isTypedArray = require('./isTypedArray'),
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safeGet = require('./_safeGet'),
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toPlainObject = require('./toPlainObject');
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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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module.exports = baseMergeDeep;
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