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| 'use strict';
|
| /**
| * Convert a string or array into a projection object, retaining all
| * `-` and `+` paths.
| */
|
| module.exports = function parseProjection(v, retainMinusPaths) {
| const type = typeof v;
|
| if (type === 'string') {
| v = v.split(/\s+/);
| }
| if (!Array.isArray(v) && Object.prototype.toString.call(v) !== '[object Arguments]') {
| return v;
| }
|
| const len = v.length;
| const ret = {};
| for (let i = 0; i < len; ++i) {
| let field = v[i];
| if (!field) {
| continue;
| }
| const include = '-' == field[0] ? 0 : 1;
| if (!retainMinusPaths && include === 0) {
| field = field.substring(1);
| }
| ret[field] = include;
| }
|
| return ret;
| };
|
|
