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// Gets the flash's act. This will early exit if flashActData is missing.
// By default, if there's no flash whose list of flashes includes this flash,
// the output dependency will be null; set {notFoundMode: 'exit'} to early
// exit instead.
//
// This step models with Flash.withAlbum.
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: `withFlashAct`,
inputs: {
notFoundMode: input({
validate: is('exit', 'null'),
defaultValue: 'null',
}),
},
outputs: ['#flashAct'],
steps: () => [
// null flashActData is always an early exit.
exitWithoutDependency({
dependency: 'flashActData',
mode: input.value('null'),
}),
// empty flashActData conditionally exits early or outputs null.
withResultOfAvailabilityCheck({
from: 'flashActData',
mode: input.value('empty'),
}).outputs({
'#availability': '#flashActDataAvailability',
}),
{
dependencies: [input('notFoundMode'), '#flashActDataAvailability'],
compute(continuation, {
[input('notFoundMode')]: notFoundMode,
['#flashActDataAvailability']: flashActDataIsAvailable,
}) {
if (flashActDataIsAvailable) return continuation();
switch (notFoundMode) {
case 'exit': return continuation.exit(null);
case 'null': return continuation.raiseOutput({'#flashAct': null});
}
},
},
withPropertyFromList({
list: 'flashActData',
property: input.value('flashes'),
}),
{
dependencies: [input.myself(), '#flashActData.flashes'],
compute: (continuation, {
[input.myself()]: track,
['#flashActData.flashes']: flashLists,
}) => continuation({
['#flashActIndex']:
flashLists.findIndex(flashes => flashes.includes(track)),
}),
},
// album not found conditionally exits or outputs null.
withResultOfAvailabilityCheck({
from: '#flashActIndex',
mode: input.value('index'),
}).outputs({
'#availability': '#flashActAvailability',
}),
{
dependencies: [input('notFoundMode'), '#flashActAvailability'],
compute(continuation, {
[input('notFoundMode')]: notFoundMode,
['#flashActAvailability']: flashActIsAvailable,
}) {
if (flashActIsAvailable) return continuation();
switch (notFoundMode) {
case 'exit': return continuation.exit(null);
case 'null': return continuation.raiseOutput({'#flashAct': null});
}
},
},
{
dependencies: ['flashActData', '#flashActIndex'],
compute: (continuation, {
['flashActData']: flashActData,
['#flashActIndex']: flashActIndex,
}) => continuation.raiseOutput({
['#flashAct']:
flashActData[flashActIndex],
}),
},
],
});
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