23 lines
769 B
JavaScript
23 lines
769 B
JavaScript
function produce(producer) {
|
|
return producer();
|
|
}
|
|
export function pathWalk(path, initialProducers, shrink) {
|
|
const producers = initialProducers;
|
|
const segments = path.split(':').map((text) => +text);
|
|
if (segments.length === 0) {
|
|
return producers.map(produce);
|
|
}
|
|
if (!segments.every((v) => !Number.isNaN(v))) {
|
|
throw new Error(`Unable to replay, got invalid path=${path}`);
|
|
}
|
|
let values = producers.drop(segments[0]).map(produce);
|
|
for (const s of segments.slice(1)) {
|
|
const valueToShrink = values.getNthOrLast(0);
|
|
if (valueToShrink === null) {
|
|
throw new Error(`Unable to replay, got wrong path=${path}`);
|
|
}
|
|
values = shrink(valueToShrink).drop(s);
|
|
}
|
|
return values;
|
|
}
|