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generate_assets.ts
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generate_assets.ts
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import {
basename,
dirname,
Document,
DOMParser,
Element,
join,
} from "./deps.ts";
import { decoder, encoder, getLocalDependencyPaths, md5, qs } from "./util.ts";
import { bundleByEsbuild, bundleBySwc } from "./bundle_util.ts";
import type { File } from "./types.ts";
type GenerateAssetsOptions = {
watchPaths?: boolean;
bundler?: "swc" | "esbuild";
};
/**
* Generates assets from the given entrypoint path (html).
* Also returns watch paths when `watchPaths` option is true.
*/
export async function generateAssets(
path: string,
opts: GenerateAssetsOptions = {},
): Promise<[AsyncGenerator<File, void, void>, string[]]> {
const timeStarted = Date.now();
const html = decoder.decode(await Deno.readFile(path));
const base = dirname(path);
const filename = basename(path);
if (!filename.endsWith(".html")) {
throw new Error(`Entrypoint needs to be an html file: ${path}`);
}
const pageName = filename.replace(/\.html$/, "");
if (!pageName) {
throw new Error(`Bad entrypoint name: ${path}`);
}
const doc = new DOMParser().parseFromString(html, "text/html")!;
const assets = [...extractReferencedAssets(doc)];
const generator = (async function* () {
for (const a of assets) {
yield await a.createFileObject(pageName, base, { bundler: opts.bundler });
}
yield Object.assign(
new Blob([encoder.encode(doc.body.parentElement!.outerHTML)]),
{ name: filename },
);
const timeEnded = Date.now();
console.log(`Built in ${timeEnded - timeStarted}ms`);
})();
const watchPaths = opts.watchPaths
? (await Promise.all(assets.map((a) => a.getWatchPaths(base)))).flat()
: [];
return [generator, [path, ...watchPaths]];
}
export async function* watchAndGenAssets(
path: string,
opts: GenerateAssetsOptions = {},
): AsyncGenerator<File, void, void> {
let [assets, watchPaths] = await generateAssets(path, {
watchPaths: true,
...opts,
});
while (true) {
for await (const file of assets) {
yield file;
}
const watcher = Deno.watchFs(watchPaths);
for await (const e of watcher) {
console.log("Changed: " + e.paths.join(""));
break;
// watcher.close();
}
console.log("Rebuilding");
[assets, watchPaths] = await generateAssets(path, { watchPaths: true, ...opts });
}
}
type CreateFileObjectOptions = {
bundler?: "swc" | "esbuild";
};
type Asset = {
getWatchPaths(base: string): Promise<string[]>;
createFileObject(
pageName: string,
base: string,
opts: CreateFileObjectOptions,
): Promise<File>;
};
class CssAsset implements Asset {
static create(link: Element): CssAsset | null {
const href = link.getAttribute("href");
if (link.getAttribute("rel") === "stylesheet" && href) {
return new CssAsset(href, link);
}
return null;
}
#el: Element;
#href: string;
#dest?: string;
constructor(href: string, link: Element) {
this.#el = link;
this.#href = href;
}
getWatchPaths(base: string): Promise<string[]> {
return Promise.resolve([join(base, this.#href)]);
}
async createFileObject(pageName: string, base: string): Promise<File> {
const data = await Deno.readFile(join(base, this.#href));
this.#dest = `${pageName}.${md5(data)}.css`;
this.#el.setAttribute("href", this.#dest);
return Object.assign(new Blob([data]), { name: this.#dest });
}
}
class ScriptAsset implements Asset {
static create(script: Element): ScriptAsset | null {
const src = script.getAttribute("src");
if (src) {
return new ScriptAsset(src, script);
}
return null;
}
#src: string;
#dest?: string;
#el: Element;
constructor(src: string, script: Element) {
this.#src = src;
this.#el = script;
}
async getWatchPaths(base: string): Promise<string[]> {
return await getLocalDependencyPaths(join(base, this.#src));
}
async createFileObject(
pageName: string,
base: string,
{ bundler }: CreateFileObjectOptions,
): Promise<File> {
const path = join(base, this.#src);
const data = bundler === "swc"
? await bundleBySwc(path)
: await bundleByEsbuild(path);
// TODO(kt3k): Maybe align this asset naming to parcel.
// Note: parcel uses a shorter name.
this.#dest = `${pageName}.${md5(data)}.js`;
this.#el.setAttribute("src", this.#dest);
return Object.assign(new Blob([data]), { name: this.#dest });
}
}
export function* extractReferencedAssets(
doc: Document,
): Generator<Asset, void, void> {
yield* extractReferencedScripts(doc);
yield* extractReferencedStyleSheets(doc);
}
function* extractReferencedScripts(
doc: Document,
): Generator<Asset, void, void> {
for (const s of qs(doc, "script")) {
const asset = ScriptAsset.create(s);
if (asset) yield asset;
}
}
function* extractReferencedStyleSheets(
doc: Document,
): Generator<Asset, void, void> {
for (const link of qs(doc, "link")) {
const asset = CssAsset.create(link);
if (asset) yield asset;
}
}