115 lines
3.2 KiB
TypeScript
115 lines
3.2 KiB
TypeScript
import { ELEMENT_NODE, parse, renderSync, walkSync } from "ultrahtml";
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import { parseScript } from "esprima";
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export default eventHandler(async (event) => {
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const { path } = event;
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let html = await getHtml(path);
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// transforms
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const transforms = [doSetUp, deleteServerScripts, insertRegistry];
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if (html) {
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for (const transform of transforms) {
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html = transform(html.toString());
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}
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}
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return html ?? new Response("Not found", { status: 404 });
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});
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const getHtml = async (path: string) => {
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const rawPath = path[path.length - 1] === "/" ? path.slice(0, -1) : path;
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const filename = rawPath === "" ? "/index.html" : `${rawPath}.html`;
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const fallback = getPath(rawPath + "/index.html");
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const filePath = getPath(filename);
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let html = await useStorage().getItem(filePath);
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if (!html) html = await useStorage().getItem(fallback);
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if (!html) html = await useStorage().getItem(getPath("/404.html"));
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return html;
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};
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function getPath(filename: string) {
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return `assets/pages${filename}`;
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}
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function insertRegistry(html: string): string {
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// temporary; use ultrahtml later
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const registryScript =
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'<script type="module" src="./.output/registry.js"></script>';
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const ast = parse(html);
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let hasCustomElements = false;
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walkSync(ast, (node) => {
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if (node.type === ELEMENT_NODE && node.name.includes("-")) {
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hasCustomElements = true;
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}
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});
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// insert registry script to head
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if (hasCustomElements)
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walkSync(ast, (node) => {
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if (node.type === ELEMENT_NODE && node.name === "head") {
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node.children.push(parse(registryScript));
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}
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});
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return renderSync(ast);
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}
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function doSetUp(html: string) {
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const ast = parse(html);
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const serverScripts = [];
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walkSync(ast, (node) => {
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const { attributes } = node;
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const attributeKeys = Object.keys(attributes ?? {});
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const isServerScript = attributeKeys.some((key) => key.includes("server:"));
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if (
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node.type === ELEMENT_NODE &&
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node.name === "script" &&
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isServerScript
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) {
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const scripts = node.children.map((child) => child.value);
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serverScripts.push(scripts.join(" "));
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}
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});
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const setupMap = {};
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serverScripts.forEach((script: string) => {
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const { body } = parseScript(script);
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const keys = body
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.filter((node) => node.type === "VariableDeclaration")
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.map((node) => node.declarations[0].id.name);
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const constructor = `new Function(\`${script}; return {${keys.join(
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","
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)}}\`);`;
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const evalStore = eval(constructor);
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Object.assign(setupMap, new evalStore());
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});
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const regex = /{{(.*?)}}/g;
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var match;
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while ((match = regex.exec(html))) {
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let [key, value] = match;
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value = value.replace(/\s/g, "");
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html = html.replace(key, setupMap[value]);
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}
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return html;
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}
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function deleteServerScripts(html: string): string {
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const ast = parse(html);
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walkSync(ast, (node) => {
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const { attributes } = node;
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const attributeKeys = Object.keys(attributes ?? {});
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const isServerScript = attributeKeys.some((key) => key.includes("server:"));
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if (isServerScript) {
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node.parent.children.splice(node.parent.children.indexOf(node), 1);
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}
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});
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return renderSync(ast);
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}
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