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1'use strict';2 3import utils from '../utils.js';4import AxiosError from '../core/AxiosError.js';5import { DEFAULT_FORM_DATA_MAX_DEPTH } from './toFormData.js';6 7const MAX_DEPTH = DEFAULT_FORM_DATA_MAX_DEPTH;8 9function throwIfDepthExceeded(index) {10  if (index > MAX_DEPTH) {11    throw new AxiosError(12      'FormData field is too deeply nested (' + index + ' levels). Max depth: ' + MAX_DEPTH,13      AxiosError.ERR_FORM_DATA_DEPTH_EXCEEDED14    );15  }16}17 18/**19 * It takes a string like `foo[x][y][z]` and returns an array like `['foo', 'x', 'y', 'z']20 *21 * @param {string} name - The name of the property to get.22 *23 * @returns An array of strings.24 */25function parsePropPath(name) {26  // foo[x][y][z] -> ['foo', 'x', 'y', 'z']27  // foo.x.y.z    -> ['foo', 'x', 'y', 'z']28  // A path is split on `.` and on `[...]` groups. A segment — whether written29  // in dot notation or captured inside brackets — may contain any character30  // except `.`, `[` and `]`, so a key like `user-name` or `user name` is kept31  // literal instead of being split (#5402). `.`, `[` and `]` keep their existing32  // meaning, e.g. `foo[bar.baz]` -> ['foo', 'bar', 'baz'] and `[]` is an array push.33  // Excluding `[` from the bracket group also makes the match fail fast at the34  // next `[`, so a malformed name cannot rescan to the end of the string from35  // every unmatched `[` — parsing stays linear in the length of the name.36  const path = [];37  const pattern = /[^.[\]]+|\[([^.[\]]*)]/g;38  let match;39 40  while ((match = pattern.exec(name)) !== null) {41    throwIfDepthExceeded(path.length);42    path.push(match[0] === '[]' ? '' : match[1] || match[0]);43  }44 45  return path;46}47 48/**49 * Convert an array to an object.50 *51 * @param {Array<any>} arr - The array to convert to an object.52 *53 * @returns An object with the same keys and values as the array.54 */55function arrayToObject(arr) {56  const obj = {};57  const keys = Object.keys(arr);58  let i;59  const len = keys.length;60  let key;61  for (i = 0; i < len; i++) {62    key = keys[i];63    obj[key] = arr[key];64  }65  return obj;66}67 68/**69 * It takes a FormData object and returns a JavaScript object70 *71 * @param {string} formData The FormData object to convert to JSON.72 *73 * @returns {Object<string, any> | null} The converted object.74 */75function formDataToJSON(formData) {76  function buildPath(path, value, target, index) {77    throwIfDepthExceeded(index);78 79    let name = path[index++];80 81    if (name === '__proto__') return true;82 83    const isNumericKey = Number.isFinite(+name);84    const isLast = index >= path.length;85    name = !name && utils.isArray(target) ? target.length : name;86 87    if (isLast) {88      if (utils.hasOwnProp(target, name)) {89        target[name] = utils.isArray(target[name])90          ? target[name].concat(value)91          : [target[name], value];92      } else {93        target[name] = value;94      }95 96      return !isNumericKey;97    }98 99    if (!utils.hasOwnProp(target, name) || !utils.isObject(target[name])) {100      target[name] = [];101    }102 103    const result = buildPath(path, value, target[name], index);104 105    if (result && utils.isArray(target[name])) {106      target[name] = arrayToObject(target[name]);107    }108 109    return !isNumericKey;110  }111 112  if (utils.isFormData(formData) && utils.isFunction(formData.entries)) {113    const obj = {};114 115    utils.forEachEntry(formData, (name, value) => {116      buildPath(parsePropPath(name), value, obj, 0);117    });118 119    return obj;120  }121 122  return null;123}124 125export default formDataToJSON;126