onEnterFrame-generator-04.js

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// When a generator frame is resumed, the onEnterFrame fires again.

// The same Frame object is passed.

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

g.eval(`

    function* easyMode() {}

    function* f() { yield* "XYZ"; }

    function* hardMode() {

        for (let c1 of "AB")

            for (let c2 of f())

                yield c1 + c2;

`);

function test(mode, expected) {

    let dbg = new Debugger(g);

    let nextid = 1;

    dbg.onEnterFrame = frame => {

        if (frame.type == "call") {

            if (!("id" in frame))

                frame.id = nextid++;

            g.log += frame.id + "(";

            frame.onPop = rv => {

                g.log += ")";

};

};

    g.log = "";

    g.eval(`

        for (let x of ${mode}())

            log += x;

`);

    assertEq(g.log, expected);

    dbg.removeDebuggee(g);

// We fire onEnterFrame for the initial activation when a generator is first

// called, even though the initial yield happens before any body code. This is

// weird but at least it's consistent.

test("easyMode", "1()1()");

test("hardMode", "1()1(2()2())AX1(2())AY1(2())AZ1(2()3()3())BX1(3())BY1(3())BZ1(3())");