1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
'use strict';
const isExclusive = require('../projection/isExclusive');const isInclusive = require('../projection/isInclusive');
/*! * ignore */
module.exports = function selectPopulatedFields(fields, userProvidedFields, populateOptions) {  if (populateOptions == null) {    return;  }
  const paths = Object.keys(populateOptions);  userProvidedFields = userProvidedFields || {};  if (isInclusive(fields)) {    for (const path of paths) {      if (!isPathInFields(userProvidedFields, path)) {        fields[path] = 1;      } else if (userProvidedFields[path] === 0) {        delete fields[path];      }    }  } else if (isExclusive(fields)) {    for (const path of paths) {      if (userProvidedFields[path] == null) {        delete fields[path];      }    }  }};
/*! * ignore */
function isPathInFields(userProvidedFields, path) {  const pieces = path.split('.');  const len = pieces.length;  let cur = pieces[0];  for (let i = 1; i < len; ++i) {    if (userProvidedFields[cur] != null || userProvidedFields[cur + '.$'] != null) {      return true;    }    cur += '.' + pieces[i];  }  return userProvidedFields[cur] != null || userProvidedFields[cur + '.$'] != null;}