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only replace components for changed segments

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This commit is contained in:
Rich Harris
2018-07-17 15:42:35 -04:00
parent 84aaf3be4a
commit f126c6ac6c
7 changed files with 180 additions and 19 deletions
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10
src/middleware.ts
View File

@@ -255,14 +255,18 @@ function get_page_handler(routes: RouteObject, store_getter: (req: Req) => Store
? {}
: get_params(page.pattern.exec(req.path));
const chunks: Record<string, string> = get_chunks();
const chunks: Record<string, string | string[]> = get_chunks();
res.setHeader('Content-Type', 'text/html');
// preload main.js and current route
// TODO detect other stuff we can preload? images, CSS, fonts?
const link = []
.concat(chunks.main, error ? [] : page.parts.map(part => chunks[part.name]))
let preloaded_chunks = Array.isArray(chunks.main) ? chunks.main : [chunks.main];
page.parts.forEach(part => {
preloaded_chunks = preloaded_chunks.concat(chunks[part.name]); // using concat because it could be a string or an array. thanks webpack!
});
const link = preloaded_chunks
.filter(file => !file.match(/\.map$/))
.map(file => `<${req.baseUrl}/client/${file}>;rel="preload";as="script"`)
.join(', ');

97
src/runtime/index.ts
View File

@@ -7,6 +7,31 @@ export let root: Component;
let target: Node;
let store: Store;
let routes: Routes;
let segments: string[] = [];
type RootProps = {
path: string;
params: Record<string, string>;
query: Record<string, string>;
child: Child;
};
type Child = {
segment?: string;
props?: any;
component?: Component;
};
const root_props: RootProps = {
path: null,
params: null,
query: null,
child: {
segment: null,
component: null,
props: {}
}
};
export { root as component }; // legacy reasons — drop in a future version
@@ -52,10 +77,23 @@ function select_route(url: URL): Target {
let current_token: {};
function render(data: any, scroll: ScrollPosition, token: {}) {
function render(data: any, changed_from: number, scroll: ScrollPosition, token: {}) {
if (current_token !== token) return;
if (root) {
// first, clear out highest-level root component
let level = data.child;
for (let i = 0; i < changed_from; i += 1) {
if (i === changed_from) break;
level = level.props.child;
}
const { component } = level;
level.component = null;
root.set({ child: data.child });
// then render new stuff
level.component = component;
root.set(data);
} else {
// first load — remove SSR'd <head> contents
@@ -80,18 +118,32 @@ function render(data: any, scroll: ScrollPosition, token: {}) {
window.scrollTo(scroll.x, scroll.y);
}
Object.assign(root_props, data);
ready = true;
}
function changed(a: Record<string, string | true>, b: Record<string, string | true>) {
return JSON.stringify(a) !== JSON.stringify(b);
}
function prepare_page(target: Target): Promise<{
redirect?: Redirect;
data?: any
data?: any;
changed_from?: number;
}> {
if (root) {
root.set({ preloading: true });
}
const { page, path, query } = target;
const new_segments = path.split('/').filter(Boolean);
let changed_from = 0;
while (
segments[changed_from] &&
new_segments[changed_from] &&
segments[changed_from] === new_segments[changed_from]
) changed_from += 1;
let redirect: Redirect = null;
let error: { statusCode: number, message: Error | string } = null;
@@ -111,6 +163,8 @@ function prepare_page(target: Target): Promise<{
};
return Promise.all(page.parts.map(async (part, i) => {
if (i < changed_from) return null;
const { default: Component } = await part.component();
const req = {
path,
@@ -131,6 +185,8 @@ function prepare_page(target: Target): Promise<{
return { redirect };
}
segments = new_segments;
const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
const params = get_params(target.match);
@@ -154,28 +210,37 @@ function prepare_page(target: Target): Promise<{
};
}
// TODO skip unchanged segments
const props = { path, query };
const data = { path, query, params, preloading: false, child: {} };
const data = {
path,
preloading: false,
child: Object.assign({}, root_props.child)
};
if (changed(query, root_props.query)) data.query = query;
if (changed(params, root_props.params)) data.params = params;
let level = data.child;
for (let i = 0; i < page.parts.length; i += 1) {
const part = page.parts[i];
const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
const get_params = part.params || (() => ({}));
Object.assign(level, {
// TODO segment
props: Object.assign({}, props, {
if (i < changed_from) {
level.props.path = path;
level.props.query = query;
level.props.child = Object.assign({}, level.props.child);
} else {
level.segment = new_segments[i];
level.component = results[i].Component;
level.props = Object.assign({}, level.props, props, {
params: get_params(target.match),
}, results[i].preloaded),
component: results[i].Component
});
if (i < results.length - 1) {
}, results[i].preloaded);
level.props.child = {};
}
level = level.props.child;
}
return { data };
return { data, changed_from };
});
}
@@ -200,12 +265,12 @@ async function navigate(target: Target, id: number): Promise<any> {
prefetching = null;
const token = current_token = {};
const { redirect, data } = await loaded;
const { redirect, data, changed_from } = await loaded;
if (redirect) {
await goto(redirect.location, { replaceState: true });
} else {
render(data, scroll_history[id], token);
render(data, changed_from, scroll_history[id], token);
document.activeElement.blur();
}
}
@@ -271,7 +336,7 @@ function handle_popstate(event: PopStateEvent) {
let prefetching: {
href: string;
promise: Promise<{ redirect?: Redirect, data?: any }>;
promise: Promise<{ redirect?: Redirect, data?: any, changed_from?: number }>;
} = null;
export function prefetch(href: string) {

20
test/app/routes/[x]/[y]/[z].html Normal file
View File

@@ -0,0 +1,20 @@
<span>z: {segment} {count}</span>
<a href="foo/bar/qux"></a>
<script>
import counts from '../_counts.js';
export default {
preload() {
return {
count: counts.z += 1
};
},
oncreate() {
this.set({
segment: this.get().params.z
});
}
};
</script>

20
test/app/routes/[x]/[y]/index.html Normal file
View File

@@ -0,0 +1,20 @@
<span>y: {segment} {count}</span>
<svelte:component this={child.component} {...child.props}/>
<script>
import counts from '../_counts.js';
export default {
preload() {
return {
count: counts.y += 1
};
},
oncreate() {
this.set({
segment: this.get().params.y
});
}
};
</script>

5
test/app/routes/[x]/_counts.js Normal file
View File

@@ -0,0 +1,5 @@
export default {
x: process.browser ? 1 : 0,
y: process.browser ? 1 : 0,
z: process.browser ? 1 : 0
};

20
test/app/routes/[x]/index.html Normal file
View File

@@ -0,0 +1,20 @@
<span>x: {segment} {count}</span>
<svelte:component this={child.component} {...child.props}/>
<script>
import counts from './_counts.js';
export default {
preload() {
return {
count: counts.x += 1
};
},
oncreate() {
this.set({
segment: this.get().params.x
});
}
};
</script>

27
test/common/test.js
View File

@@ -632,6 +632,33 @@ function run({ mode, basepath = '' }) {
assert.equal(html.indexOf('%sapper'), -1);
});
});
it('only recreates components when necessary', () => {
return nightmare
.goto(`${base}/foo/bar/baz`)
.init()
.evaluate(() => document.querySelector('#sapper').textContent)
.then(text => {
assert.deepEqual(text.split('\n').filter(Boolean), [
'x: foo 1',
'y: bar 1',
'z: baz 1'
]);
return nightmare.click(`a`)
.then(() => wait(100))
.then(() => {
return nightmare.evaluate(() => document.querySelector('#sapper').textContent);
});
})
.then(text => {
assert.deepEqual(text.split('\n').filter(Boolean), [
'x: foo 1',
'y: bar 1',
'z: qux 2'
]);
});
});
});
describe('headers', () => {