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#!/usr/bin/env node
// Dependency-free JS harness: instantiate the real freestanding core in Node,
// then render its packed frame through app.mjs against a deliberately tiny DOM
// double. Chrome is reserved for the separate browser/e2e snapshot harness.
import assert from "node:assert/strict";
import fs from "node:fs/promises";
import path from "node:path";
import { pathToFileURL } from "node:url";
if (process.argv.length !== 3) {
console.error("usage: node test/web_harness.mjs <zig-out/web>");
process.exit(2);
}
async function main() {
const webDir = path.resolve(process.argv[2]);
const wasmBytes = await fs.readFile(path.join(webDir, "pardes.wasm"));
const module = await WebAssembly.compile(wasmBytes);
assert.deepEqual(WebAssembly.Module.imports(module), [], "the freestanding core must have no JS or libc imports");
const { exports: wasm } = await WebAssembly.instantiate(module, {});
for (const name of [
"memory", "pardes_init", "pardes_frame", "pardes_frame_ptr", "pardes_key",
"pardes_mouse", "pardes_output", "pardes_lsp_response", "pardes_file_changed",
"pardes_effect_next", "pardes_deinit",
]) assert.ok(wasm[name], `missing wasm export ${name}`);
assert.equal(wasm.pardes_init(80, 24), 0, `wasm init error ${wasm.pardes_last_error()}`);
assert.equal(wasm.pardes_frame(), 80 * 24);
assert.ok(wasm.pardes_frame_ptr() > 0);
const { DomRenderer } = await import(pathToFileURL(path.join(webDir, "app.mjs")));
const document = new FakeDocument();
const root = document.createElement("main");
root.ownerDocument = document;
const renderer = new DomRenderer(root, wasm);
const first = renderer.render();
assert.equal(first.cols, 80);
assert.equal(first.rows, 24);
assert.equal(root.children.length, 24);
assert.equal(root.children[0].children.length, 80);
assert.ok(first.cells.some((cell) => cell.text !== " "), "dump rendered an empty frame");
assert.ok(root.walk().every((node) => node.tagName !== "CANVAS"), "renderer created a canvas");
const firstCell = renderer.cells[0];
const second = renderer.render();
assert.equal(renderer.cells[0], firstCell, "stable frames should reuse DOM nodes");
assert.equal(second.cells.length, 80 * 24);
wasm.pardes_mouse(2, 0, 5, 3, 0);
wasm.pardes_mouse(2, 1, 5, 3, 0);
const looked = renderer.render();
assert.match(looked.cells.map((cell) => cell.text).join(""), /build\.zig Save New Del/, "right-click LOOK did not open the embedded source");
const sourceRows = Array.from({ length: looked.rows }, (_, row) =>
looked.cells.slice(row * looked.cols, (row + 1) * looked.cols));
const codeRows = sourceRows.filter((row) => row.map((cell) => cell.text).join("").match(/^\s*\d+\s/));
const codeColors = new Set(codeRows.flatMap((row) => row.slice(5).map((cell) => `${cell.fg}:${cell.attrs & 1}`)));
assert.ok(codeColors.size >= 3, "Tree-sitter did not apply distinct syntax styles to build.zig");
let sawWatch = false;
for (let index = 0; index < 32; index += 1) {
const kind = wasm.pardes_effect_next();
if (!kind) break;
if (kind === 9) sawWatch = true;
}
assert.ok(sawWatch, "JS effect drain did not receive the opened file watch request");
wasm.pardes_resize(41, 13);
const resized = renderer.render();
assert.equal(resized.cols, 41);
assert.equal(resized.rows, 13);
assert.equal(root.children.length, 13);
assert.equal(root.children[0].children.length, 41);
wasm.pardes_deinit();
console.error("web harness ok: freestanding wasm + Tree-sitter + packed DOM renderer");
}
class FakeDocument {
constructor() {
this.body = new FakeElement("body", this);
}
createElement(tagName) {
return new FakeElement(tagName, this);
}
}
class FakeElement {
constructor(tagName, ownerDocument) {
this.tagName = tagName.toUpperCase();
this.ownerDocument = ownerDocument;
this.children = [];
this.attributes = new Map();
this.dataset = {};
this.style = new FakeStyle();
this.classList = new FakeClassList(this);
this.className = "";
this.textContent = "";
}
setAttribute(name, value) {
this.attributes.set(name, String(value));
}
replaceChildren(...children) {
this.children = children;
}
*walk() {
yield this;
for (const child of this.children) yield* child.walk();
}
}
class FakeStyle {
setProperty(name, value) {
this[name] = value;
}
}
class FakeClassList {
constructor(element) {
this.element = element;
this.names = new Set();
}
toggle(name, force) {
if (force) this.names.add(name);
else this.names.delete(name);
this.element.className = [...this.names].join(" ");
}
}
await main();
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