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// Check out the info on reverseReferenceList!
// This is its composable form.
//
// This implementation uses a global cache (via WeakMap) to attempt to speed
// up subsequent similar accesses.
//
// This has absolutely not been rigorously tested with altering properties of
// data objects in a wiki data array which is reused. If a new wiki data array
// is used, a fresh cache will always be created.
//
// Note that this implementation is mirrored in withReverseContributionList,
// so any changes should be reflected there (until these are combined).
import {input, templateCompositeFrom} from '#composite';
import {stitchArrays} from '#sugar';
import {exitWithoutDependency, raiseOutputWithoutDependency}
from '#composite/control-flow';
import {withMappedList} from '#composite/data';
import inputWikiData from './inputWikiData.js';
// Mapping of reference list property to WeakMap.
// Each WeakMap maps a wiki data array to another weak map,
// which in turn maps each referenced thing to an array of
// things referencing it.
const caches = new Map();
export default templateCompositeFrom({
annotation: `withReverseReferenceList`,
inputs: {
data: inputWikiData({allowMixedTypes: false}),
list: input({type: 'string'}),
},
outputs: ['#reverseReferenceList'],
steps: () => [
// Common behavior --
// Early exit with an empty array if the data list isn't available.
exitWithoutDependency({
dependency: input('data'),
value: input.value([]),
}),
// Raise an empty array (don't early exit) if the data list is empty.
raiseOutputWithoutDependency({
dependency: input('data'),
mode: input.value('empty'),
output: input.value({'#reverseReferenceList': []}),
}),
// Check for an existing cache record which corresponds to this
// input('list') and input('data'). If it exists, query it for the
// current thing, and raise that; if it doesn't, create it, put it
// where it needs to be, and provide it so the next steps can fill
// it in.
{
dependencies: [input('list'), input('data'), input.myself()],
compute: (continuation, {
[input('list')]: list,
[input('data')]: data,
[input.myself()]: myself,
}) => {
if (!caches.has(list)) {
const cache = new WeakMap();
caches.set(list, cache);
const cacheRecord = new WeakMap();
cache.set(data, cacheRecord);
return continuation({
['#cacheRecord']: cacheRecord,
});
}
const cache = caches.get(list);
if (!cache.has(data)) {
const cacheRecord = new WeakMap();
cache.set(data, cacheRecord);
return continuation({
['#cacheRecord']: cacheRecord,
});
}
return continuation.raiseOutput({
['#reverseReferenceList']:
cache.get(data).get(myself) ?? [],
});
},
},
// Unique behavior for reference lists --
{
dependencies: [input('list')],
compute: (continuation, {
[input('list')]: list,
}) => continuation({
['#referenceMap']:
thing => thing[list],
}),
},
withMappedList({
list: input('data'),
map: '#referenceMap',
}).outputs({
'#mappedList': '#referencedThings',
}),
{
dependencies: [input('data')],
compute: (continuation, {
[input('data')]: data,
}) => continuation({
['#referencingThings']:
data,
}),
},
// Common behavior --
// Actually fill in the cache record. Since we're building up a *reverse*
// reference list, track connections in terms of the referenced thing.
// No newly-provided dependencies here since we're mutating the cache
// record, which is properly in store and will probably be reused in the
// future (and certainly in the next step).
{
dependencies: ['#cacheRecord', '#referencingThings', '#referencedThings'],
compute: (continuation, {
['#cacheRecord']: cacheRecord,
['#referencingThings']: referencingThings,
['#referencedThings']: referencedThings,
}) => {
stitchArrays({
referencingThing: referencingThings,
referencedThings: referencedThings,
}).forEach(({referencingThing, referencedThings}) => {
for (const referencedThing of referencedThings) {
if (cacheRecord.has(referencedThing)) {
cacheRecord.get(referencedThing).push(referencingThing);
} else {
cacheRecord.set(referencedThing, [referencingThing]);
}
}
});
return continuation();
},
},
// Then just pluck out the current object from the now-filled cache record!
{
dependencies: ['#cacheRecord', input.myself()],
compute: (continuation, {
['#cacheRecord']: cacheRecord,
[input.myself()]: myself,
}) => continuation({
['#reverseReferenceList']:
cacheRecord.get(myself) ?? [],
}),
},
],
});
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