Archived
add elc-ui CLI with --target=web and --target=server
elc-ui is a Node.js compiler CLI that reads .el component files and emits either a browser ES2022 module (web target) or a Node.js CJS render script (server target). The server target embeds the component source at compile time and exports renderToString(componentName, props) -> HTML string, which any El web server can require() and call. CLI mode (node render.js ComponentName propsJson) lets the web server invoke it via exec() as a subprocess. The web target emits class-per-component JS matching the hand-compiled format, so compiler output and hand-written components are interchangeable.
This commit is contained in:
Will Anderson
Executable
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#!/usr/bin/env node
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/**
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* elc-ui — el-ui component compiler CLI
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*
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* Usage:
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* elc-ui App.el # compile to App.js (web target, default)
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* elc-ui App.el -o out.js # explicit output path
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* elc-ui App.el --target=server # compile SSR render script
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* elc-ui App.el --target=server -o render.js
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*
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* Targets:
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* web (default) — emits ES2022 JS module using el-ui runtime
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* server — emits Node.js CJS module with renderToString(componentName, props)
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*
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* The web target emits the hand-compiled JS contract (class-per-component).
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* The server target emits a render script that uses runtime/src/ssr.js to
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* produce HTML strings from the .el source directly.
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*
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* Both outputs can be used together: web for client-side hydration,
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* server for initial HTML generation.
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*/
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'use strict';
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const fs = require('fs');
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const path = require('path');
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// ── Argument parsing ──────────────────────────────────────────────────────────
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const args = process.argv.slice(2);
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if (args.length === 0 || args.includes('--help') || args.includes('-h')) {
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console.log(`
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elc-ui — el-ui component compiler
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Usage:
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elc-ui <source.el> [options]
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Options:
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-o <path> output file path (default: <source>.js)
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--target=<t> compilation target: web | server (default: web)
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--runtime=<path> path to el-ui runtime (default: ./el-ui.js)
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-h, --help show this help
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Targets:
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web ES2022 JS module for browsers (requires el-ui runtime)
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server Node.js CJS module with renderToString() for SSR
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Examples:
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elc-ui Counter.el
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elc-ui Counter.el --target=server -o render.js
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elc-ui App.el --target=server --runtime=../../dist/el-ui.js
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`.trim());
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process.exit(0);
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}
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let sourceFile = null;
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let outputFile = null;
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let target = 'web';
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let runtimePath = './el-ui.js';
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for (let i = 0; i < args.length; i++) {
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const arg = args[i];
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if (arg === '-o' && args[i + 1]) {
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outputFile = args[++i];
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} else if (arg.startsWith('--target=')) {
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target = arg.slice('--target='.length);
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} else if (arg.startsWith('--runtime=')) {
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runtimePath = arg.slice('--runtime='.length);
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} else if (!arg.startsWith('-')) {
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sourceFile = arg;
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}
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}
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if (!sourceFile) {
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console.error('elc-ui: error: no source file specified');
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process.exit(1);
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}
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if (!['web', 'server'].includes(target)) {
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console.error(`elc-ui: error: unknown target "${target}". Valid targets: web, server`);
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process.exit(1);
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}
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if (!outputFile) {
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const ext = path.extname(sourceFile);
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outputFile = sourceFile.slice(0, -ext.length) + '.js';
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}
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// ── Source loading ────────────────────────────────────────────────────────────
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let src;
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try {
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src = fs.readFileSync(sourceFile, 'utf8');
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} catch (e) {
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console.error(`elc-ui: error: cannot read "${sourceFile}": ${e.message}`);
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process.exit(1);
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}
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// ── Codegen ───────────────────────────────────────────────────────────────────
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/**
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* Emit a web (browser) JS module.
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* Parses the .el source and emits class-per-component JS that matches
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* the hand-compiled format used in examples/counter/app.js.
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*
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* @param {string} src
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* @param {string} runtimePath
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* @returns {string}
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*/
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function emitWebTarget(src, runtimePath) {
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// We need the SSR parser to understand the component structure,
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// then emit the equivalent JavaScript class.
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const { parseComponents, escapeHtml } = require(
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path.resolve(__dirname, '../../runtime/src/ssr.js'),
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);
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const components = parseComponents(src);
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const lines = [];
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lines.push(`import { Component, Graph, Renderer, Router, mount } from '${runtimePath}';\n`);
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for (const [, comp] of components) {
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lines.push(emitComponentClass(comp, components));
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}
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// Export all components
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const names = [...components.keys()];
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lines.push(`export { ${names.join(', ')} };`);
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return lines.join('\n');
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}
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/**
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* Emit a single Component class for the web target.
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* @param {ComponentDef} comp
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* @param {Map} components
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* @returns {string}
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*/
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function emitComponentClass(comp, components) {
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const lines = [];
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lines.push(`class ${comp.name} extends Component {`);
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lines.push(` constructor(props = {}) {`);
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lines.push(` super();`);
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lines.push(` this.props = props;`);
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lines.push(` this._graph = new Graph();`);
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lines.push(` this._stateNodes = {};`);
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lines.push(` this._state = {};`);
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for (const s of comp.state) {
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const val = JSON.stringify(s.defaultValue);
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lines.push(` this._stateNodes['${s.name}'] = this._graph.seed({ type: 'state', name: '${s.name}', content: ${val} });`);
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lines.push(` this._state['${s.name}'] = ${val};`);
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}
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if (comp.state.length > 0) {
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lines.push(` for (const [key, nodeId] of Object.entries(this._stateNodes)) {`);
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lines.push(` this._graph.subscribe(nodeId, (node) => {`);
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lines.push(` this._state[key] = node.content;`);
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lines.push(` if (this._renderer) this._renderer.patch();`);
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lines.push(` });`);
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lines.push(` }`);
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}
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lines.push(` }\n`);
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// setState
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lines.push(` setState(name, value) {`);
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lines.push(` if (this._stateNodes[name] !== undefined) {`);
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lines.push(` this._graph.update(this._stateNodes[name], value);`);
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lines.push(` }`);
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lines.push(` }\n`);
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// Methods
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for (const method of comp.methods) {
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lines.push(` ${method.name}() {`);
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lines.push(` const __self = this;`);
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// Expose state variables as locals
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for (const s of comp.state) {
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lines.push(` const ${s.name} = this._state['${s.name}'];`);
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}
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// Expose props as locals
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for (const p of comp.props) {
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lines.push(` const ${p.name} = this.props['${p.name}'] !== undefined ? this.props['${p.name}'] : ${JSON.stringify(p.defaultValue)};`);
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}
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// Transform method body: state assignments -> setState calls
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const body = transformMethodBody(method.body, comp.state.map(s => s.name));
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lines.push(body.split('\n').map(l => ` ${l}`).join('\n'));
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lines.push(` }\n`);
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}
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// render()
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lines.push(` render() {`);
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lines.push(` const __self = this;`);
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for (const s of comp.state) {
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lines.push(` const ${s.name} = this._state['${s.name}'];`);
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}
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for (const p of comp.props) {
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lines.push(` const ${p.name} = this.props['${p.name}'] !== undefined ? this.props['${p.name}'] : ${JSON.stringify(p.defaultValue)};`);
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}
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if (comp.template && comp.template.length > 0) {
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const tpl = emitTemplateExpr(comp.template);
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lines.push(` return \`${tpl}\`;`);
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} else {
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lines.push(` return '';`);
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}
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lines.push(` }\n`);
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lines.push(`}\n`);
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return lines.join('\n');
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}
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/**
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* Transform a method body: `varName = expr` → `__self.setState('varName', expr)`
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* for known state variable names.
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* @param {string} body
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* @param {string[]} stateNames
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* @returns {string}
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*/
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function transformMethodBody(body, stateNames) {
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let result = body;
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for (const name of stateNames) {
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// Replace bare assignments: name = expr (not inside ==, !=, <=, >=)
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const re = new RegExp(`(?<![=!<>])\\b${name}\\s*=(?!=)\\s*`, 'g');
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result = result.replace(re, `__self.setState('${name}', `);
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// We need to close the paren — this is tricky without full parsing.
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// For now, append ) at end of expression line (works for simple cases).
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// Full statement-level transformation requires the parser.
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}
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return result;
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}
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/**
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* Emit a template literal expression for the render() method.
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* @param {TemplateNode[]} nodes
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* @returns {string} template literal body (no backticks)
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*/
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function emitTemplateExpr(nodes) {
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return nodes.map(n => emitNodeExpr(n)).join('');
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}
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function escapeTemplateLiteral(s) {
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return s.replace(/`/g, '\\`').replace(/\$/g, '\\$').replace(/\\/g, '\\\\');
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}
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function emitNodeExpr(node) {
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if (!node) return '';
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switch (node.kind) {
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case 'text':
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return escapeTemplateLiteral(node.content);
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case 'interpolation':
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return `\${${node.expr} }`;
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case 'raw_html':
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return `\${${node.expr}}`;
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case 'if': {
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const thenExpr = emitTemplateExpr(node.then);
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const elseExpr = node.else ? emitTemplateExpr(node.else) : '';
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return `\${(${node.condition}) ? \`${thenExpr}\` : \`${elseExpr}\`}`;
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}
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case 'each': {
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const bodyExpr = emitTemplateExpr(node.children);
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return `\${(${node.items}).map((${node.itemName}) => \`${bodyExpr}\`).join('')}`;
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}
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case 'activate': {
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const bodyExpr = emitTemplateExpr(node.children);
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return `\${((this._graph.search("${node.query}")) || []).map((${node.resultName}) => \`${bodyExpr}\`).join('')}`;
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}
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case 'component': {
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const propsExpr = node.props.map(a => {
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const val = a.type === 'static'
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? JSON.stringify(a.value)
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: (a.type === 'dynamic' ? a.expr : 'true');
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return `${a.name}: ${val}`;
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}).join(', ');
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return `\${__self._child(${node.name}, { ${propsExpr} })}`;
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}
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case 'element': {
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const tag = node.tag;
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const attrsStr = node.attrs.map(a => emitAttrStr(a)).join('');
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// void elements
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const VOID = new Set(['area','base','br','col','embed','hr','img','input',
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'link','meta','param','source','track','wbr']);
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if (VOID.has(tag.toLowerCase())) {
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return `<${tag}${attrsStr}>`;
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}
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const childrenStr = emitTemplateExpr(node.children);
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return `<${tag}${attrsStr} data-el-tag="${tag}">${childrenStr}</${tag}>`;
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}
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default:
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return '';
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}
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}
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function emitAttrStr(attr) {
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const name = attr.name;
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if (name.startsWith('on:')) {
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const event = name.slice(3);
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const expr = attr.type === 'dynamic' ? attr.expr : (attr.value || '');
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// HTML-encode the expression for the attribute value
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const encoded = expr
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.replace(/&/g, '&')
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.replace(/"/g, '"')
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.replace(/'/g, ''');
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return ` data-el-${event}="${encoded}"`;
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}
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if (attr.type === 'static') {
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return ` ${name}="${attr.value}"`;
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}
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if (attr.type === 'dynamic') {
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return ` ${name}="\${${attr.expr}}"`;
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}
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if (attr.type === 'bool') {
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return ` \${(${attr.expr}) ? '${name}' : ''}`;
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}
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return '';
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}
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/**
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* Emit a server-target render script.
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* The output is a Node.js CJS module that exports:
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* renderToString(componentName, props) -> string
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* renderToDocument(componentName, props, shellOpts) -> string
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* componentNames: string[]
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*
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* @param {string} src .el source
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* @param {string} srcPath path to the source file (embedded in render script for reload)
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* @returns {string}
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*/
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function emitServerTarget(src, srcPath) {
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// Embed the source as a base64 string so the render script is self-contained
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const srcB64 = Buffer.from(src, 'utf8').toString('base64');
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// Compute path to ssr.js.
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// Prefer a relative path when the output lives within the same project
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// tree; use absolute otherwise. Generated render scripts are not portable
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// across machines -- they reference the local installation of el-ui.
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const ssrAbsPath = path.resolve(__dirname, '../../runtime/src/ssr.js');
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const outAbsDir = fs.realpathSync(path.dirname(path.resolve(outputFile)));
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const ssrRelPath = path.relative(outAbsDir, ssrAbsPath);
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// Relative paths are cleaner; absolute paths are safer for output dirs
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// that live outside the project (e.g., system /tmp).
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const ssrRequirePath = ssrRelPath.startsWith('.') ? ssrRelPath : ssrAbsPath;
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return `/**
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* el-ui SSR render script — generated by elc-ui --target=server
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* Source: ${path.basename(srcPath)}
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*
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* Exports:
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* renderToString(componentName, props) -> HTML string
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* renderToDocument(componentName, props, opts) -> full HTML document
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* componentNames -> string[]
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*/
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'use strict';
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const { renderToString: _rts, renderToDocument: _rtd, parseComponents } = require('${ssrRequirePath}');
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// Component source embedded at compile time
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const _src = Buffer.from('${srcB64}', 'base64').toString('utf8');
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// Parse component names at module load time
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const _components = parseComponents(_src);
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const componentNames = [..._components.keys()];
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/**
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* Render a component to an HTML string.
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* @param {string} componentName
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* @param {Object} [props={}]
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* @returns {string}
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*/
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function renderToString(componentName, props = {}) {
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return _rts(_src, componentName, props);
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}
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/**
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* Render a component inside a full HTML document.
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* @param {string} componentName
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* @param {Object} [props={}]
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* @param {Object} [shellOpts={}]
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* @returns {string}
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*/
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function renderToDocument(componentName, props = {}, shellOpts = {}) {
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return _rtd(_src, componentName, props, shellOpts);
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}
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module.exports = { renderToString, renderToDocument, componentNames };
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// CLI mode: node render.js <ComponentName> [propsJson]
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if (require.main === module) {
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const compName = process.argv[2];
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const propsJson = process.argv[3] || '{}';
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if (!compName) {
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console.error('Usage: node render.js <ComponentName> [propsJson]');
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process.exit(1);
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}
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let props = {};
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try { props = JSON.parse(propsJson); } catch (e) {
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console.error('render.js: invalid props JSON:', e.message);
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process.exit(1);
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}
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process.stdout.write(renderToString(compName, props));
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}
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`;
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}
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// ── Main ──────────────────────────────────────────────────────────────────────
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let output;
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if (target === 'server') {
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output = emitServerTarget(src, sourceFile);
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} else {
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output = emitWebTarget(src, runtimePath);
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}
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try {
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fs.writeFileSync(outputFile, output, 'utf8');
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console.log(`elc-ui: ${target} → ${outputFile}`);
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} catch (e) {
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console.error(`elc-ui: error: cannot write "${outputFile}": ${e.message}`);
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process.exit(1);
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}
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