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generate_assets.ts
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generate_assets.ts
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/**
* This file contains the functions which create assets from the given paths.
* An asset is the unit of build target.
*
* There are 5 types of assets
* - HtmlAsset
* - CssAsset
* - ScssAsset
* - ScriptAsset - represents javascript or typescript
* - ImageAsset
*/
import {
basename,
dirname,
Document,
DOMParser,
Element,
join,
} from "./deps.ts";
import {
decoder,
encoder,
getLocalDependencyPaths,
isLocalUrl,
md5,
qs,
} from "./util.ts";
import { wasmPath } from "./install_util.ts";
import { bundleByEsbuild } from "./bundle_util.ts";
import { logger } from "./logger_util.ts";
import { compile as compileSass } from "./sass_util.ts";
/**
* Options for asset generation.
*
* @property watchPaths true when the system is watching the paths i.e. packup serve
* @property onBuild The hook which is called when the build is finished. Used when `packup serve`
*/
type GenerateAssetsOptions = {
watchPaths?: boolean;
onBuild?: () => void;
insertLivereloadScript?: boolean;
livereloadPort?: number;
mainAs404?: boolean;
publicUrl: string;
};
/**
* Generates assets from the given entrypoint path (html).
* Also returns watch paths when `watchPaths` option is true.
*
* Used both in `packup build` and `packup serve`.
*/
export async function generateAssets(
path: string,
opts: GenerateAssetsOptions,
): Promise<[AsyncGenerator<File, void, void>, string[]]> {
const buildStarted = Date.now();
const htmlAsset = await HtmlAsset.create(path);
const { pageName, base } = htmlAsset;
const pathPrefix = opts.publicUrl || ".";
const assets = [...htmlAsset.extractReferencedAssets()];
if (opts.insertLivereloadScript) {
htmlAsset.insertScriptTag(
`http://localhost:${opts.livereloadPort!}/livereload.js`,
);
}
const generator = (async function* () {
for (const a of assets) {
// TODO(kt3k): These can be concurrent
const files = await a.createFileObject({ pageName, base, pathPrefix });
for (const file of files) yield file;
}
// This needs to be the last.
const files = await htmlAsset.createFileObject({
pageName,
base,
pathPrefix,
});
for (const file of files) yield file;
if (opts.mainAs404) {
yield Object.assign(
(await htmlAsset.createFileObject({ pageName, base, pathPrefix }))[0],
{ name: "404", lastModified: 0 },
);
}
logger.log(`${path} bundled in ${Date.now() - buildStarted}ms`);
// If build hook is set, call it. Used for live reloading.
opts.onBuild?.();
logger.debug("onBuild");
})();
const watchPaths = opts.watchPaths
? (await Promise.all(assets.map((a) => a.getWatchPaths(htmlAsset.base))))
.flat()
: [];
return [generator, [path, ...watchPaths]];
}
/**
* Builds the entrypoint and watches the all files referenced from the entrypoint.
* If any change is happend in any of the watched paths, then builds again and update
* the watching paths. Used in `packup serve`.
*/
export async function* watchAndGenAssets(
path: string,
opts: GenerateAssetsOptions,
): AsyncGenerator<File, void, void> {
opts = {
...opts,
watchPaths: true,
insertLivereloadScript: true,
};
let [assets, watchPaths] = await generateAssets(path, opts);
while (true) {
for await (const file of assets) {
yield file;
}
const watcher = Deno.watchFs(watchPaths);
for await (const e of watcher) {
logger.log("Changed: " + e.paths.join(""));
break;
// watcher.close();
}
logger.log("Rebuilding");
await new Promise<void>((resolve) => setTimeout(() => resolve(), 100));
[assets, watchPaths] = await generateAssets(path, opts);
}
}
type CreateFileObjectParams = {
pageName: string;
base: string;
pathPrefix: string;
};
type Asset = {
getWatchPaths(base: string): Promise<string[]>;
createFileObject(params: CreateFileObjectParams): Promise<File[]>;
};
const docType = encoder.encode("<!DOCTYPE html>");
/** HtmlAsset represents the html file */
class HtmlAsset implements Asset {
static async create(path: string): Promise<HtmlAsset> {
logger.debug("Reading", path);
const html = decoder.decode(await Deno.readFile(path));
return new HtmlAsset(html, path);
}
#doc: Document;
#path: string;
base: string;
#filename: string;
pageName: string;
constructor(html: string, path: string) {
this.#doc = new DOMParser().parseFromString(html, "text/html")!;
this.#path = path;
this.base = dirname(path);
this.#filename = basename(path);
if (!this.#filename.endsWith(".html")) {
throw new Error(`Entrypoint needs to be an html file: ${path}`);
}
this.pageName = this.#filename.replace(/\.html$/, "");
if (!this.pageName) {
throw new Error(`Bad entrypoint name: ${path}`);
}
}
extractReferencedAssets() {
return extractReferencedAssets(this.#doc);
}
createFileObject(_params: CreateFileObjectParams) {
return Promise.resolve([Object.assign(
new Blob([docType, encoder.encode(this.#doc.documentElement!.outerHTML)]),
{ name: this.#filename, lastModified: 0 },
)]);
}
getWatchPaths() {
return Promise.resolve([this.#path]);
}
insertScriptTag(path: string) {
const script = this.#doc.createElement("script");
script.setAttribute("src", path);
this.#doc.body.insertBefore(script, null);
}
}
/** ScssAsset represents a <link rel="stylesheet"> tag in the html */
class CssAsset implements Asset {
static create(link: Element): CssAsset | null {
const href = link.getAttribute("href");
const rel = link.getAttribute("rel");
if (rel !== "stylesheet") {
return null;
}
if (!href) {
logger.warn(
"<link> tag has rel=stylesheet attribute, but doesn't have href attribute",
);
return null;
}
if (href.startsWith("https://") || href.startsWith("http://")) {
// If href starts with http(s):// schemes, we consider these as
// external reference. So skip handling these
return null;
}
if (href.endsWith(".scss")) {
return new ScssAsset(href, link);
}
return new CssAsset(href, link);
}
_el: Element;
_href: string;
_dest?: string;
constructor(href: string, link: Element) {
this._el = link;
this._href = href;
}
getWatchPaths(base: string): Promise<string[]> {
return Promise.resolve([join(base, this._href)]);
}
async createFileObject(
{ pageName, base, pathPrefix }: CreateFileObjectParams,
): Promise<File[]> {
const data = await Deno.readFile(join(base, this._href));
this._dest = `${pageName}.${md5(data)}.css`;
this._el.setAttribute("href", join(pathPrefix, this._dest));
return [
Object.assign(new Blob([data]), { name: this._dest, lastModified: 0 }),
];
}
}
/** ScssAsset represents a <link rel="stylesheet"> tag
* with href having .scss extension in the html */
class ScssAsset extends CssAsset {
// TODO(kt3k): implement getWatchPaths correctly
async createFileObject(
{ pageName, base, pathPrefix }: CreateFileObjectParams,
): Promise<File[]> {
const scss = await Deno.readFile(join(base, this._href));
this._dest = `${pageName}.${md5(scss)}.css`;
this._el.setAttribute("href", join(pathPrefix, this._dest));
return [Object.assign(new Blob([await compileSass(decoder.decode(scss))]), {
name: this._dest,
lastModified: 0,
})];
}
}
/** ScriptAsset represents a <script> tag in the html */
class ScriptAsset implements Asset {
static create(script: Element): ScriptAsset | null {
const src = script.getAttribute("src");
if (!src) {
// this <script> should contain inline scripts.
return null;
}
if (src.startsWith("http://") || src.startsWith("https://")) {
// If "src" starts with http(s):// schemes, we consider these as
// external reference. So skip handling these
return null;
}
return new ScriptAsset(src, script);
}
#src: string;
#dest?: string;
#el: Element;
constructor(src: string, script: Element) {
this.#src = src;
this.#el = script;
}
async getWatchPaths(base: string): Promise<string[]> {
return await getLocalDependencyPaths(join(base, this.#src));
}
async createFileObject({
pageName,
base,
pathPrefix,
}: CreateFileObjectParams): Promise<File[]> {
const path = join(base, this.#src);
const data = await bundleByEsbuild(path, wasmPath());
this.#dest = `${pageName}.${md5(data)}.js`;
this.#el.setAttribute("src", join(pathPrefix, this.#dest));
return [
Object.assign(new Blob([data]), { name: this.#dest, lastModified: 0 }),
];
}
}
/** ImageAsset represents a `<img>` tag in the html */
class ImageAsset implements Asset {
static create(img: Element): ImageAsset | null {
let sources: string[] = [];
const src = img.getAttribute("src");
const srcset = img.getAttribute("srcset");
if (img.tagName === "IMG" && !src) {
logger.warn("<img> tag doesn't have src attribute");
return null;
}
if (src && isLocalUrl(src)) sources.push(src);
if (srcset) {
sources.push(
...srcset
.split(",") // Separate the different srcset
.filter(Boolean) // Remove empty strings
.map((src) => src.trim()) // Remove white spaces
.map((src) => src.split(" ")[0]) // Separate the source from the size
.filter(isLocalUrl), // Remove external references
);
}
// Remove duplicates
sources = [...new Set(sources)];
// If "src" or "srcset" only have external references, skip handling
if (sources.length === 0) return null;
return new ImageAsset(sources, img);
}
#sources: string[];
#el: Element;
constructor(sources: string[], image: Element) {
this.#sources = sources;
this.#el = image;
}
async getWatchPaths(base: string): Promise<string[]> {
const localDependencyPaths: Promise<string[]>[] = [];
for (const src of this.#sources) {
localDependencyPaths.push(getLocalDependencyPaths(join(base, src)));
}
return (await Promise.all(localDependencyPaths))
.flatMap((path) => path); // Flatten result
}
async createFileObject(
{ pageName, base, pathPrefix }: CreateFileObjectParams,
): Promise<File[]> {
// TODO(tjosepo): Find a way to avoid creating copies of the same image
// when creating a bundle
const files: File[] = [];
for (const src of this.#sources) {
const data = await Deno.readFile(join(base, src));
const [, extension] = src.match(/\.([\w]+)$/) ?? [];
const dest = `${pageName}.${md5(data)}.${extension}`;
if (this.#el.getAttribute("src")?.match(src)) {
this.#el.setAttribute("src", join(pathPrefix, dest));
}
const srcset = this.#el.getAttribute("srcset");
if (srcset?.includes(src)) {
// TODO(tjosepo): Find a better way to replace the old src with the new
// dest without only using `string.replace()`
this.#el.setAttribute(
"srcset",
srcset.replace(src, join(pathPrefix, dest)),
);
}
files.push(
Object.assign(new Blob([data]), { name: dest, lastModified: 0 }),
);
}
return files;
}
}
export function* extractReferencedAssets(
doc: Document,
): Generator<Asset, void, void> {
yield* extractReferencedScripts(doc);
yield* extractReferencedStyleSheets(doc);
yield* extractReferencedImages(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;
}
}
function* extractReferencedImages(
doc: Document,
): Generator<Asset, void, void> {
for (const img of [...qs(doc, "img"), ...qs(doc, "source")]) {
const asset = ImageAsset.create(img);
if (asset) yield asset;
}
}