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// Gets the track's album. This will early exit if albumData is missing.
// By default, if there's no album whose list of tracks includes this track,
// the output dependency will be null; set {notFoundMode: 'exit'} to early
// exit instead.
//
// This step models with Flash.withFlashAct.
import {input, templateCompositeFrom} from '#composite';
import {is} from '#validators';
import {exitWithoutDependency, withResultOfAvailabilityCheck}
from '#composite/control-flow';
import {withPropertyFromList} from '#composite/data';
export default templateCompositeFrom({
annotation: `withAlbum`,
inputs: {
notFoundMode: input({
validate: is('exit', 'null'),
defaultValue: 'null',
}),
},
outputs: ['#album'],
steps: () => [
// null albumData is always an early exit.
exitWithoutDependency({
dependency: 'albumData',
mode: input.value('null'),
}),
// empty albumData conditionally exits early or outputs null.
withResultOfAvailabilityCheck({
from: 'albumData',
mode: input.value('empty'),
}).outputs({
'#availability': '#albumDataAvailability',
}),
{
dependencies: [input('notFoundMode'), '#albumDataAvailability'],
compute(continuation, {
[input('notFoundMode')]: notFoundMode,
['#albumDataAvailability']: albumDataIsAvailable,
}) {
if (albumDataIsAvailable) return continuation();
switch (notFoundMode) {
case 'exit': return continuation.exit(null);
case 'null': return continuation.raiseOutput({'#album': null});
}
},
},
withPropertyFromList({
list: 'albumData',
property: input.value('tracks'),
}),
{
dependencies: [input.myself(), '#albumData.tracks'],
compute: (continuation, {
[input.myself()]: track,
['#albumData.tracks']: trackLists,
}) => continuation({
['#albumIndex']:
trackLists.findIndex(tracks => tracks.includes(track)),
}),
},
// album not found conditionally exits or outputs null.
withResultOfAvailabilityCheck({
from: '#albumIndex',
mode: input.value('index'),
}).outputs({
'#availability': '#albumAvailability',
}),
{
dependencies: [input('notFoundMode'), '#albumAvailability'],
compute(continuation, {
[input('notFoundMode')]: notFoundMode,
['#albumAvailability']: albumIsAvailable,
}) {
if (albumIsAvailable) return continuation();
switch (notFoundMode) {
case 'exit': return continuation.exit(null);
case 'null': return continuation.raiseOutput({'#album': null});
}
},
},
{
dependencies: ['albumData', '#albumIndex'],
compute: (continuation, {
['albumData']: albumData,
['#albumIndex']: albumIndex,
}) => continuation.raiseOutput({
['#album']:
albumData[albumIndex],
}),
},
],
});
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