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/*
This file is part of GNU Taler
(C) 2021 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import { ComponentChildren, Fragment, FunctionalComponent, h as create, options, render as renderIntoDom, VNode } from "preact";
import { render as renderToString } from "preact-render-to-string";
// When doing tests we want the requestAnimationFrame to be as fast as possible.
// without this option the RAF will timeout after 100ms making the tests slower
options.requestAnimationFrame = (fn: () => void) => {
// console.log("RAF called")
return fn()
}
export function createExample<Props>(
Component: FunctionalComponent<Props>,
props: Partial<Props>,
): ComponentChildren {
const Render = (args: any): VNode => create(Component, args);
Render.args = props;
return Render;
}
export function createExampleWithCustomContext<Props, ContextProps>(
Component: FunctionalComponent<Props>,
props: Partial<Props>,
ContextProvider: FunctionalComponent<ContextProps>,
contextProps: Partial<ContextProps>,
): ComponentChildren {
const Render = (args: any): VNode => create(Component, args);
const WithContext = (args: any): VNode => create(ContextProvider, { ...contextProps, children: [Render(args)] } as any);
WithContext.args = props
return WithContext
}
export function NullLink({ children }: { children?: ComponentChildren }): VNode {
return create("a", { children, href: "javascript:void(0);" });
}
export function renderNodeOrBrowser(Component: any, args: any): void {
const vdom = create(Component, args);
if (typeof window === "undefined") {
renderToString(vdom);
} else {
const div = document.createElement("div");
document.body.appendChild(div);
renderIntoDom(vdom, div);
renderIntoDom(null, div);
document.body.removeChild(div);
}
}
interface Mounted<T> {
unmount: () => void;
getLastResult: () => T | null;
getLastResultOrThrow: () => T;
assertNoPendingUpdate: () => void;
waitNextUpdate: (s?: string) => Promise<void>;
}
const isNode = typeof window === "undefined"
export function mountHook<T>(callback: () => T, Context?: ({ children }: { children: any }) => VNode): Mounted<T> {
// const result: { current: T | null } = {
// current: null
// }
let lastResult: T | null = null;
const listener: Array<() => void> = []
// component that's going to hold the hook
function Component(): VNode {
const hookResult = callback()
// save the hook result
lastResult = hookResult
// notify to everyone waiting for an update and clean the queue
listener.splice(0, listener.length).forEach(cb => cb())
return create(Fragment, {})
}
// create the vdom with context if required
const vdom = !Context ? create(Component, {}) : create(Context, { children: [create(Component, {})] },);
// waiter callback
async function waitNextUpdate(_label = ""): Promise<void> {
if (_label) _label = `. label: "${_label}"`
await new Promise((res, rej) => {
const tid = setTimeout(() => {
rej(Error(`waiting for an update but the hook didn't make one${_label}`))
}, 100)
listener.push(() => {
clearTimeout(tid)
res(undefined)
})
})
}
const customElement = {} as Element
const parentElement = isNode ? customElement : document.createElement("div");
if (!isNode) {
document.body.appendChild(parentElement);
}
renderIntoDom(vdom, parentElement);
// clean up callback
function unmount(): void {
if (!isNode) {
document.body.removeChild(parentElement);
}
}
function getLastResult(): T | null {
const copy = lastResult
lastResult = null
return copy;
}
function getLastResultOrThrow(): T {
const r = getLastResult()
if (!r) throw Error('there was no last result')
return r;
}
async function assertNoPendingUpdate(): Promise<void> {
await new Promise((res, rej) => {
const tid = setTimeout(() => {
res(undefined)
}, 10)
listener.push(() => {
clearTimeout(tid)
rej(Error(`Expecting no pending result but the hook get updated. Check the dependencies of the hooks.`))
})
})
const r = getLastResult()
if (r) throw Error('There are still pending results. This may happen because the hook did a new update but the test didn\'t get the result using getLastResult');
}
return {
unmount, getLastResult, getLastResultOrThrow, waitNextUpdate, assertNoPendingUpdate
}
}
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