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// Like withReverseReferenceList, but this is specifically for special "unique"
// references, meaning this thing is referenced by exactly one or zero things
// in the data list.
import {input, templateCompositeFrom} from '#composite';
import {exitWithoutDependency, raiseOutputWithoutDependency}
from '#composite/control-flow';
import inputWikiData from './inputWikiData.js';
import withReverseReferenceList from './withReverseReferenceList.js';
export default templateCompositeFrom({
annotation: `withUniqueReferencingThing`,
inputs: {
data: inputWikiData({allowMixedTypes: false}),
list: input({type: 'string'}),
},
outputs: ['#uniqueReferencingThing'],
steps: () => [
// withReverseRefernceList does this check too, but it early exits with
// an empty array. That's no good here!
exitWithoutDependency({
dependency: input('data'),
mode: input.value('empty'),
}),
withReverseReferenceList({
data: input('data'),
list: input('list'),
}),
raiseOutputWithoutDependency({
dependency: '#reverseReferenceList',
mode: input.value('empty'),
output: input.value({'#uniqueReferencingThing': null}),
}),
{
dependencies: ['#reverseReferenceList'],
compute: (continuation, {
['#reverseReferenceList']: reverseReferenceList,
}) => continuation({
['#uniqueReferencingThing']:
reverseReferenceList[0],
}),
},
],
});
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