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/*
* Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import {
Observable,
filter,
fromEvent,
map,
merge,
shareReplay,
startWith
} from "rxjs"
import { getOptionalElement } from "~/browser"
import { h } from "~/utilities"
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Retrieve location hash
*
* @returns Location hash
*/
export function getLocationHash(): string {
return location.hash.slice(1)
}
/**
* Set location hash
*
* Setting a new fragment identifier via `location.hash` will have no effect
* if the value doesn't change. When a new fragment identifier is set, we want
* the browser to target the respective element at all times, which is why we
* use this dirty little trick.
*
* @param hash - Location hash
*/
export function setLocationHash(hash: string): void {
const el = h("a", { href: hash })
el.addEventListener("click", ev => ev.stopPropagation())
el.click()
}
/* ------------------------------------------------------------------------- */
/**
* Watch location hash
*
* @param location$ - Location observable
*
* @returns Location hash observable
*/
export function watchLocationHash(
location$: Observable<URL>
): Observable<string> {
return merge(
fromEvent<HashChangeEvent>(window, "hashchange"),
location$
)
.pipe(
map(getLocationHash),
startWith(getLocationHash()),
filter(hash => hash.length > 0),
shareReplay(1)
)
}
/**
* Watch location target
*
* @param location$ - Location observable
*
* @returns Location target observable
*/
export function watchLocationTarget(
location$: Observable<URL>
): Observable<HTMLElement> {
return watchLocationHash(location$)
.pipe(
map(id => getOptionalElement(`[id="${id}"]`)!),
filter(el => typeof el !== "undefined")
)
}
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