You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

34 lines
686 B
JavaScript

'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;
};