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index.js
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index.js
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const flatten = source => (start, sink) => {
if (start !== 0) return;
let outerTalkback;
let innerTalkback;
function talkback(t, d) {
if (t === 1) (innerTalkback || outerTalkback)(1, d);
if (t === 2) {
innerTalkback && innerTalkback(2);
outerTalkback && outerTalkback(2);
}
}
source(0, (T, D) => {
if (T === 0) {
outerTalkback = D;
sink(0, talkback);
} else if (T === 1) {
const innerSource = D;
innerTalkback && innerTalkback(2);
innerSource(0, (t, d) => {
if (t === 0) {
innerTalkback = d;
innerTalkback(1);
} else if (t === 1) sink(1, d);
else if (t === 2 && d) {
outerTalkback && outerTalkback(2);
sink(2, d);
} else if (t === 2) {
if (!outerTalkback) sink(2);
else {
innerTalkback = void 0;
outerTalkback(1);
}
}
});
} else if (T === 2 && D) {
innerTalkback && innerTalkback(2);
sink(2, D);
} else if (T === 2) {
if (!innerTalkback) sink(2);
else outerTalkback = void 0;
}
});
};
export default flatten;