onEnterFrame-generator-resumption-02.js

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// A Debugger can {return:} from onEnterFrame at any resume point in a generator.

// Force-returning closes the generator.

load(libdir + "asserts.js");

let g = newGlobal({newCompartment: true});

g.values = [1, 2, 3];

g.eval(`function* f() { yield* values; }`);

let dbg = Debugger(g);

// onEnterFrame will fire up to 5 times.

// - once for the initial call to g.f();

// - four times at resume points:

//   - initial resume at the top of the generator body

//   - resume after yielding 1

//   - resume after yielding 2

//   - resume after yielding 3 (this resumption will run to the end).

// This test ignores the initial call and focuses on resume points.

for (let i = 1; i < 5; i++) {

    let hits = 0;

    dbg.onEnterFrame = frame => {

        return hits++ < i ? undefined : {return: "we're done here"};

};

    let genObj = g.f();

    let actual = [];

    while (true) {

        let r = genObj.next();

        if (r.done) {

            assertDeepEq(r, {value: "we're done here", done: true});

            break;

        actual.push(r.value);

    assertEq(hits, i + 1);

    assertDeepEq(actual, g.values.slice(0, i - 1));

    assertDeepEq(genObj.next(), {value: undefined, done: true});