next
Version:
The React Framework
47 lines (46 loc) • 2.01 kB
JavaScript
import { DEFAULT_SEGMENT_KEY } from '../../../../shared/lib/segment';
import { createRouterCacheKey } from '../create-router-cache-key';
export function findHeadInCache(cache, parallelRoutes) {
return findHeadInCacheImpl(cache, parallelRoutes, '', '');
}
function findHeadInCacheImpl(cache, parallelRoutes, keyPrefix, keyPrefixWithoutSearchParams) {
const isLastItem = Object.keys(parallelRoutes).length === 0;
if (isLastItem) {
// Returns the entire Cache Node of the segment whose head we will render.
return [
cache,
keyPrefix,
keyPrefixWithoutSearchParams
];
}
// First try the 'children' parallel route if it exists
// when starting from the "root", this corresponds with the main page component
const parallelRoutesKeys = Object.keys(parallelRoutes).filter((key)=>key !== 'children');
// if we are at the root, we need to check the children slot first
if ('children' in parallelRoutes) {
parallelRoutesKeys.unshift('children');
}
const slots = cache.slots;
if (slots !== null) {
for (const key of parallelRoutesKeys){
const [segment, childParallelRoutes] = parallelRoutes[key];
// If the parallel is not matched and using the default segment,
// skip searching the head from it.
if (segment === DEFAULT_SEGMENT_KEY) {
continue;
}
const childCacheNode = slots[key];
if (!childCacheNode) {
continue;
}
const cacheKey = createRouterCacheKey(segment);
const cacheKeyWithoutSearchParams = createRouterCacheKey(segment, true);
const item = findHeadInCacheImpl(childCacheNode, childParallelRoutes, keyPrefix + '/' + cacheKey, keyPrefix + '/' + cacheKeyWithoutSearchParams);
if (item) {
return item;
}
}
}
return null;
}
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