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https://github.com/kevin-DL/sapper.git
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move app logic into templates (#444)
This commit is contained in:
Rich Harris
343
templates/src/client/app.ts
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343
templates/src/client/app.ts
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@@ -0,0 +1,343 @@
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import { Manifest, Target, ScrollPosition, Component, Redirect, ComponentLoader, ComponentConstructor, RootProps } from './types';
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import goto from './goto';
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export const manifest: Manifest = __MANIFEST__;
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let ready = false;
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let root_component: Component;
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let segments: string[] = [];
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let current_token: {};
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let root_preload: Promise<any>;
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let root_data: any;
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const root_props: RootProps = {
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path: null,
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params: null,
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query: null,
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child: {
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segment: null,
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component: null,
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props: {}
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}
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};
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export let prefetching: {
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href: string;
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promise: Promise<{ redirect?: Redirect, data?: any, nullable_depth?: number }>;
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} = null;
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export function set_prefetching(href, promise) {
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prefetching = { href, promise };
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}
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export let store;
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export function set_store(fn) {
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store = fn(initial_data.store);
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}
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export let target: Node;
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export function set_target(element) {
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target = element;
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}
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export let uid = 1;
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export function set_uid(n) {
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uid = n;
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}
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export let cid: number;
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export function set_cid(n) {
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cid = n;
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}
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export const initial_data = typeof window !== 'undefined' && window.__SAPPER__;
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export const history = typeof window !== 'undefined' ? window.history : {
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pushState: (state: any, title: string, href: string) => {},
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replaceState: (state: any, title: string, href: string) => {},
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scrollRestoration: ''
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};
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export const scroll_history: Record<string, ScrollPosition> = {};
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export function select_route(url: URL): Target {
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if (url.origin !== window.location.origin) return null;
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if (!url.pathname.startsWith(initial_data.baseUrl)) return null;
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const path = url.pathname.slice(initial_data.baseUrl.length);
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// avoid accidental clashes between server routes and pages
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if (manifest.ignore.some(pattern => pattern.test(path))) return;
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for (let i = 0; i < manifest.pages.length; i += 1) {
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const page = manifest.pages[i];
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const match = page.pattern.exec(path);
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if (match) {
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const query: Record<string, string | true> = {};
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if (url.search.length > 0) {
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url.search.slice(1).split('&').forEach(searchParam => {
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const [, key, value] = /([^=]+)(?:=(.*))?/.exec(searchParam);
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query[key] = decodeURIComponent((value || '').replace(/\+/g, ' '));
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});
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}
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return { url, path, page, match, query };
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}
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}
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}
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export function scroll_state() {
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return {
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x: window.scrollX,
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y: window.scrollY
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};
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}
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export async function navigate(target: Target, id: number): Promise<any> {
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if (id) {
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// popstate or initial navigation
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cid = id;
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} else {
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// clicked on a link. preserve scroll state
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scroll_history[cid] = scroll_state();
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id = cid = ++uid;
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scroll_history[cid] = { x: 0, y: 0 };
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}
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cid = id;
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if (root_component) {
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root_component.set({ preloading: true });
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}
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const loaded = prefetching && prefetching.href === target.url.href ?
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prefetching.promise :
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prepare_page(target);
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prefetching = null;
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const token = current_token = {};
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const { redirect, data, nullable_depth } = await loaded;
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if (redirect) {
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await goto(redirect.location, { replaceState: true });
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} else {
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render(data, nullable_depth, scroll_history[id], token);
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if (document.activeElement) document.activeElement.blur();
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}
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}
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function render(data: any, nullable_depth: number, scroll: ScrollPosition, token: {}) {
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if (current_token !== token) return;
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if (root_component) {
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// first, clear out highest-level root component
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let level = data.child;
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for (let i = 0; i < nullable_depth; i += 1) {
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if (i === nullable_depth) break;
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level = level.props.child;
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}
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const { component } = level;
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level.component = null;
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root_component.set({ child: data.child });
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// then render new stuff
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level.component = component;
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root_component.set(data);
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} else {
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// first load — remove SSR'd <head> contents
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const start = document.querySelector('#sapper-head-start');
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const end = document.querySelector('#sapper-head-end');
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if (start && end) {
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while (start.nextSibling !== end) detach(start.nextSibling);
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detach(start);
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detach(end);
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}
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Object.assign(data, root_data);
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root_component = new manifest.root({
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target,
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data,
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store,
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hydrate: true
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});
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}
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if (scroll) {
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window.scrollTo(scroll.x, scroll.y);
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}
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Object.assign(root_props, data);
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ready = true;
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}
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export function prepare_page(target: Target): Promise<{
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redirect?: Redirect;
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data?: any;
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nullable_depth?: number;
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}> {
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const { page, path, query } = target;
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const new_segments = path.split('/').filter(Boolean);
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let changed_from = 0;
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while (
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segments[changed_from] &&
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new_segments[changed_from] &&
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segments[changed_from] === new_segments[changed_from]
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) changed_from += 1;
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let redirect: Redirect = null;
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let error: { statusCode: number, message: Error | string } = null;
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const preload_context = {
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store,
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fetch: (url: string, opts?: any) => window.fetch(url, opts),
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redirect: (statusCode: number, location: string) => {
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if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
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throw new Error(`Conflicting redirects`);
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}
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redirect = { statusCode, location };
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},
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error: (statusCode: number, message: Error | string) => {
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error = { statusCode, message };
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}
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};
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if (!root_preload) {
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root_preload = manifest.root.preload
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? initial_data.preloaded[0] || manifest.root.preload.call(preload_context, {
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path,
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query,
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params: {}
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})
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: {};
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}
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return Promise.all(page.parts.map(async (part, i) => {
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if (i < changed_from) return null;
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if (!part) return null;
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const Component = await load_component(part.component);
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const req = {
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path,
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query,
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params: part.params ? part.params(target.match) : {}
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};
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const preloaded = ready || !initial_data.preloaded[i + 1]
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? Component.preload ? await Component.preload.call(preload_context, req) : {}
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: initial_data.preloaded[i + 1];
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return { Component, preloaded };
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})).catch(err => {
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error = { statusCode: 500, message: err };
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return [];
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}).then(async results => {
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if (!root_data) root_data = await root_preload;
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if (redirect) {
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return { redirect };
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}
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segments = new_segments;
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const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
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const params = get_params(target.match);
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if (error) {
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const props = {
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path,
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query,
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params,
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error: typeof error.message === 'string' ? new Error(error.message) : error.message,
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status: error.statusCode
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};
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return {
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data: Object.assign({}, props, {
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preloading: false,
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child: {
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component: manifest.error,
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props
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}
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})
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};
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}
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const props = { path, query };
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const data = {
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path,
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preloading: false,
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child: Object.assign({}, root_props.child, {
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segment: segments[0]
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})
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};
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if (changed(query, root_props.query)) data.query = query;
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if (changed(params, root_props.params)) data.params = params;
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let level = data.child;
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let nullable_depth = 0;
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for (let i = 0; i < page.parts.length; i += 1) {
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const part = page.parts[i];
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if (!part) continue;
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const get_params = part.params || (() => ({}));
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if (i < changed_from) {
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level.props.path = path;
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level.props.query = query;
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level.props.child = Object.assign({}, level.props.child);
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nullable_depth += 1;
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} else {
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level.component = results[i].Component;
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level.props = Object.assign({}, level.props, props, {
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params: get_params(target.match),
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}, results[i].preloaded);
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level.props.child = {};
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}
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level = level.props.child;
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level.segment = segments[i + 1];
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}
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return { data, nullable_depth };
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});
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}
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function load_css(chunk: string) {
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const href = `${initial_data.baseUrl}client/${chunk}`;
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if (document.querySelector(`link[href="${href}"]`)) return;
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return new Promise((fulfil, reject) => {
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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link.href = href;
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link.onload = () => fulfil();
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link.onerror = reject;
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document.head.appendChild(link);
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});
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}
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export function load_component(component: ComponentLoader): Promise<ComponentConstructor> {
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// TODO this is temporary — once placeholders are
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// always rewritten, scratch the ternary
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const promises: Array<Promise<any>> = (typeof component.css === 'string' ? [] : component.css.map(load_css));
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promises.unshift(component.js());
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return Promise.all(promises).then(values => values[0].default);
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}
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function detach(node: Node) {
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node.parentNode.removeChild(node);
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}
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function changed(a: Record<string, string | true>, b: Record<string, string | true>) {
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return JSON.stringify(a) !== JSON.stringify(b);
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}
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