char/avril

git clone https://git.t4t.associates/char/avril

Charlotte Somsnapshot: embed shared main and worker startup in the CLI688e96e2026-10-19

mod common;

#[test]
fn exposed_constructors_ignore_reparenting_and_preserve_subclassing() {
    let output = common::run(
        r#"
        import { errors } from 'avril:std';
        let calls = 0;
        function Other() { calls++; }
        for (const parent of [Other, null]) {
            for (const ctor of [DOMException, CustomEvent, ErrorEvent, PromiseRejectionEvent, MessageEvent, AbortSignal, MessagePort, ...Object.values(errors)]) {
                Object.setPrototypeOf(ctor, parent);
            }
            const exception = new DOMException('message', 'AbortError');
            if (!(exception instanceof Error) || exception.message !== 'message' || exception.code !== 20) throw Error('Exception initialization');
            const custom = new CustomEvent('custom', { detail: 42, cancelable: true });
            const error = new ErrorEvent('error', { message: 'message', lineno: 7 });
            const promise = Promise.resolve();
            const rejection = new PromiseRejectionEvent('rejection', { promise, reason: 9 });
            const message = new MessageEvent('message', { data: 3, origin: 'origin' });
            if (custom.detail !== 42 || !custom.cancelable || error.message !== 'message' || error.lineno !== 7 || rejection.promise !== promise || rejection.reason !== 9 || message.data !== 3 || message.origin !== 'origin') throw Error('Event initialization');
            const target = new EventTarget();
            let events = 0;
            target.addEventListener('custom', () => events++);
            target.dispatchEvent(custom);
            if (events !== 1 || custom.target !== target) throw Error('Event base state');
            const controller = new AbortController();
            let aborted = false;
            controller.signal.addEventListener('abort', () => aborted = true);
            controller.abort(11);
            if (!aborted || controller.signal.reason !== 11 || !AbortSignal.abort().aborted) throw Error('Signal base state');
            const channel = new MessageChannel();
            let delivered = false;
            channel.port2.onmessage = event => {
                if (event.data !== 12 || event.type !== 'message' || event.target !== channel.port2) throw Error('Port delivery');
                delivered = true;
            };
            channel.port1.postMessage(12);
            await new Promise(resolve => setTimeout(resolve, 10));
            if (!delivered) throw Error('MessagePort base state');
            channel.port1.close(); channel.port2.close();
            for (const [name, ctor] of Object.entries(errors)) {
                const error = new ctor('failure');
                if (!(error instanceof Error) || error.name !== name || error.message !== 'failure') throw Error('File error initialization');
            }
            class Child extends CustomEvent { #value = 13; get value() { return this.#value; } }
            const child = new Child('child', { detail: 14 });
            if (!(child instanceof Child) || !(child instanceof CustomEvent) || !(child instanceof Event) || child.type !== 'child' || child.detail !== 14 || child.value !== 13) throw Error('Guest subclass');
        }
        if (calls) throw Error('Guest superclass called');
        console.log('constructors safe');
        "#,
        &[],
    );
    assert_eq!(output.stdout, b"constructors safe\n");
}

#[test]
fn message_event_initialization_uses_the_captured_base_method() {
    let output = common::run(
        r#"
        Event.prototype.initEvent = () => { throw Error('Guest base method'); };
        const event = new MessageEvent('before');
        event.initMessageEvent('after', true, true, 42);
        if (event.type !== 'after' || !event.bubbles || !event.cancelable || event.data !== 42) throw Error('Event initialization');
        console.log('base method safe');
        "#,
        &[],
    );
    assert_eq!(output.stdout, b"base method safe\n");
}

#[test]
fn file_write_options_do_not_iterate_internal_arrays() {
    let output = common::run(
        r#"
        import { writeTextFile, readTextFile } from 'avril:fs';
        Array.prototype[Symbol.iterator] = () => { throw Error('Guest array iterator'); };
        const path = new URL('./data', import.meta.url);
        await writeTextFile(path, 'safe');
        await writeTextFile(path, ' append', { append: true });
        if (await readTextFile(path) !== 'safe append') throw Error('Write flags');
        console.log('file options safe');
        "#,
        &[],
    );
    assert_eq!(output.stdout, b"file options safe\n");
}

const PROMISE_TEST: &str = r#"
    import { stdin } from 'avril:std';
    import * as fs from 'avril:fs';
    const originalPromise = Promise, originalThen = Promise.prototype.then;
    function observe(promise) {
        Object.defineProperty(promise, 'constructor', { value: undefined, configurable: true });
        const result = Reflect.apply(originalThen, promise, [value => value, error => { throw error; }]);
        Object.defineProperty(result, 'constructor', { value: originalPromise });
        return result;
    }
    let hooks = 0;
    const poison = () => { hooks++; throw Error('Guest promise hook'); };
    POISON
    const response = new Response(new Blob(['hello']).stream());
    if (await observe(response.text()) !== 'hello') throw Error('Body consumption');
    const source = new ReadableStream({
        start(controller) { controller.enqueue('chunk'); controller.close(); },
    });
    const clone = structuredClone(source, { transfer: [source] });
    const reader = clone.getReader();
    if ((await observe(reader.read())).value !== 'chunk' || !(await observe(reader.read())).done) throw Error('Stream transfer');
    reader.releaseLock();
    const iterator = new ReadableStream({ start(controller) { controller.close(); } }).values();
    if (!(await observe(iterator.next())).done || !(await observe(iterator.next())).done || !(await observe(iterator.return())).done) throw Error('Closed stream iterator');
    let writes = '';
    const stream = new ReadableStream({ start(controller) { controller.enqueue('pipe'); controller.close(); } });
    await observe(stream.pipeTo(new WritableStream({ write(chunk) { writes += chunk; return new originalPromise(resolve => resolve()); } })));
    if (writes !== 'pipe') throw Error('Promise callback assimilation');
    const abortController = new AbortController();
    const piping = new ReadableStream().pipeTo(new WritableStream(), { signal: abortController.signal });
    abortController.abort(42);
    try { await observe(piping); throw Error('Abort accepted'); } catch (error) { if (error !== 42) throw error; }
    const bytes = await observe(new Response(new Blob(['hello']).stream().pipeThrough(new CompressionStream('gzip'))).bytes());
    if (await observe(new Response(new Blob([bytes]).stream().pipeThrough(new DecompressionStream('gzip'))).text()) !== 'hello') throw Error('Codec promises');
    const path = new URL('./data', import.meta.url);
    await observe(fs.writeTextFile(path, 'file'));
    if (await observe(fs.readTextFile(path)) !== 'file') throw Error('File promises');
    const input = stdin.getReader();
    if (new TextDecoder().decode((await observe(input.read())).value) !== 'stdin') throw Error('Stdio promises');
    input.releaseLock();
    const wasm = new Response(new Uint8Array([0,97,115,109,1,0,0,0]), { headers: { 'content-type': 'application/wasm' } });
    if (!(await observe(WebAssembly.compileStreaming(new originalPromise(resolve => resolve(wasm)))) instanceof WebAssembly.Module)) throw Error('Wasm promises');
    let thenableCalls = 0;
    await observe(new WritableStream({ start() { return { then(resolve) { thenableCalls++; resolve(); } }; } }).close());
    if (thenableCalls !== 1 || hooks !== 0) throw Error('Promise protocol');
    console.log('promises safe');
"#;

#[test]
fn internal_reactions_ignore_promise_species() {
    promises("Object.defineProperty(Promise, Symbol.species, { get: poison });");
}

#[test]
fn internal_awaits_ignore_promise_constructor_getters() {
    promises(
        "Object.defineProperty(Promise.prototype, 'constructor', { get: poison, configurable: true });",
    );
}

#[test]
fn internal_assimilation_ignores_replaced_promise_then() {
    promises(
        "Promise.prototype.then = poison; Promise.resolve = poison; Promise.reject = poison; Promise.all = poison;",
    );
}

fn promises(poison: &str) {
    let source = PROMISE_TEST.replace("POISON", poison);
    let output = common::run(&source, b"stdin");
    assert_eq!(output.stdout, b"promises safe\n");
}