File size: 1,937 Bytes
1e92f2d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | import type { FlightRouterState } from '../../../../server/app-render/types'
import type { CacheNode } from '../../../../shared/lib/app-router-context.shared-runtime'
import { DEFAULT_SEGMENT_KEY } from '../../../../shared/lib/segment'
import { createRouterCacheKey } from '../create-router-cache-key'
export function findHeadInCache(
cache: CacheNode,
parallelRoutes: FlightRouterState[1]
): [CacheNode, string] | null {
return findHeadInCacheImpl(cache, parallelRoutes, '')
}
function findHeadInCacheImpl(
cache: CacheNode,
parallelRoutes: FlightRouterState[1],
keyPrefix: string
): [CacheNode, string] | null {
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]
}
// 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')
}
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 childSegmentMap = cache.parallelRoutes.get(key)
if (!childSegmentMap) {
continue
}
const cacheKey = createRouterCacheKey(segment)
const cacheNode = childSegmentMap.get(cacheKey)
if (!cacheNode) {
continue
}
const item = findHeadInCacheImpl(
cacheNode,
childParallelRoutes,
keyPrefix + '/' + cacheKey
)
if (item) {
return item
}
}
return null
}
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