68 lines
2.3 KiB
JavaScript
68 lines
2.3 KiB
JavaScript
var arrayCopy = require('./arrayCopy'),
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isArguments = require('../lang/isArguments'),
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isArray = require('../lang/isArray'),
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isArrayLike = require('./isArrayLike'),
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isPlainObject = require('../lang/isPlainObject'),
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isTypedArray = require('../lang/isTypedArray'),
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toPlainObject = require('../lang/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 {Function} mergeFunc The function to merge values.
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* @param {Function} [customizer] The function to customize merged values.
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* @param {Array} [stackA=[]] Tracks traversed source objects.
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* @param {Array} [stackB=[]] Associates values with source counterparts.
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* @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
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*/
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function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stackB) {
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var length = stackA.length,
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srcValue = source[key];
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while (length--) {
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if (stackA[length] == srcValue) {
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object[key] = stackB[length];
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return;
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}
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}
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var value = object[key],
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result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
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isCommon = result === undefined;
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if (isCommon) {
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result = srcValue;
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if (isArrayLike(srcValue) && (isArray(srcValue) || isTypedArray(srcValue))) {
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result = isArray(value)
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? value
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: (isArrayLike(value) ? arrayCopy(value) : []);
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}
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else if (isPlainObject(srcValue) || isArguments(srcValue)) {
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result = isArguments(value)
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? toPlainObject(value)
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: (isPlainObject(value) ? value : {});
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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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// Add the source value to the stack of traversed objects and associate
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// it with its merged value.
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stackA.push(srcValue);
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stackB.push(result);
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if (isCommon) {
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// Recursively merge objects and arrays (susceptible to call stack limits).
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object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB);
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} else if (result === result ? (result !== value) : (value === value)) {
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object[key] = result;
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}
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}
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module.exports = baseMergeDeep;
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