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import type { ParsedUrlQuery } from 'querystring'
import { getRouteMatcher } from './route-matcher'
import { getRouteRegex } from './route-regex'
export function interpolateAs(
route: string,
asPathname: string,
query: ParsedUrlQuery
) {
let interpolatedRoute = ''
const dynamicRegex = getRouteRegex(route)
const dynamicGroups = dynamicRegex.groups
const dynamicMatches =
// Try to match the dynamic route against the asPath
(asPathname !== route ? getRouteMatcher(dynamicRegex)(asPathname) : '') ||
// Fall back to reading the values from the href
// TODO: should this take priority; also need to change in the router.
query
interpolatedRoute = route
const params = Object.keys(dynamicGroups)
if (
!params.every((param) => {
let value = dynamicMatches[param] || ''
const { repeat, optional } = dynamicGroups[param]
// support single-level catch-all
// TODO: more robust handling for user-error (passing `/`)
let replaced = `[${repeat ? '...' : ''}${param}]`
if (optional) {
replaced = `${!value ? '/' : ''}[${replaced}]`
}
if (repeat && !Array.isArray(value)) value = [value]
return (
(optional || param in dynamicMatches) &&
// Interpolate group into data URL if present
(interpolatedRoute =
interpolatedRoute!.replace(
replaced,
repeat
? (value as string[])
.map(
// these values should be fully encoded instead of just
// path delimiter escaped since they are being inserted
// into the URL and we expect URL encoded segments
// when parsing dynamic route params
(segment) => encodeURIComponent(segment)
)
.join('/')
: encodeURIComponent(value as string)
) || '/')
)
})
) {
interpolatedRoute = '' // did not satisfy all requirements
// n.b. We ignore this error because we handle warning for this case in
// development in the `<Link>` component directly.
}
return {
params,
result: interpolatedRoute,
}
}
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