mirror of https://github.com/hashicorp/consul
43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
|
import { get } from '@ember/object';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a conventional non-pure Ember `computed` function into a pure one
|
||
|
|
* (see https://github.com/emberjs/rfcs/blob/be351b059f08ac0fe709bc7697860d5064717a7f/text/0000-tracked-properties.md#avoiding-dependency-hell)
|
||
|
|
*
|
||
|
|
* @param {function} computed - a computed function to 'purify' (convert to a pure function)
|
||
|
|
* @param {function} filter - Optional string filter function to pre-process the names of computed properties
|
||
|
|
* @returns {function} - A pure `computed` function
|
||
|
|
*/
|
||
|
|
|
||
|
|
export default function(computed, filter) {
|
||
|
|
return function() {
|
||
|
|
let args = [...arguments];
|
||
|
|
let success = function(value) {
|
||
|
|
return value;
|
||
|
|
};
|
||
|
|
// pop the user function off the end
|
||
|
|
if (typeof args[args.length - 1] === 'function') {
|
||
|
|
success = args.pop();
|
||
|
|
}
|
||
|
|
if (typeof filter === 'function') {
|
||
|
|
args = filter(args);
|
||
|
|
}
|
||
|
|
// this is the 'conventional' `computed`
|
||
|
|
const cb = function(name) {
|
||
|
|
return success.apply(
|
||
|
|
this,
|
||
|
|
args.map(item => {
|
||
|
|
// Right now this just takes the first part of the path so:
|
||
|
|
// `items.[]` or `items.@each.prop` etc
|
||
|
|
// gives you `items` which is 'probably' what you expect
|
||
|
|
// it won't work with something like `item.objects.[]`
|
||
|
|
// it could potentially be made to do so, but we don't need that right now at least
|
||
|
|
return get(this, item.split('.')[0]);
|
||
|
|
})
|
||
|
|
);
|
||
|
|
};
|
||
|
|
// concat/push the user function back on
|
||
|
|
return computed(...args.concat([cb]));
|
||
|
|
};
|
||
|
|
}
|