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refactor(rstream-query): simplify .findTriple(), move xforms, update …
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import { IObjectOf } from "@thi.ng/api"; | ||
| import { intersection, join } from "@thi.ng/associative"; | ||
| import { equiv } from "@thi.ng/equiv"; | ||
| import { LOGGER } from "@thi.ng/rstream"; | ||
| import { | ||
| comp, | ||
| compR, | ||
| dedupe, | ||
| keySelector, | ||
| map, | ||
| Reducer, | ||
| Transducer | ||
| } from "@thi.ng/transducers"; | ||
| import { | ||
| BindFn, | ||
| Edit, | ||
| Solutions, | ||
| Triple, | ||
| TripleIds | ||
| } from "./api"; | ||
| import { TripleStore } from "./store"; | ||
|
|
||
| export const intersect2: Transducer<IObjectOf<TripleIds>, TripleIds> = comp( | ||
| map(({ a, b }) => intersection(a, b)), | ||
| dedupe(equiv) | ||
| ); | ||
|
|
||
| export const intersect3: Transducer<IObjectOf<TripleIds>, TripleIds> = comp( | ||
| map(({ s, p, o }) => intersection(intersection(s, p), o)), | ||
| dedupe(equiv) | ||
| ); | ||
|
|
||
| export const indexSel = (key: any): Transducer<Edit, TripleIds> => ( | ||
| rfn: Reducer<any, TripleIds> | ||
| ) => { | ||
| const r = rfn[2]; | ||
| return compR(rfn, (acc, e) => { | ||
| LOGGER.fine("index sel", e.key, key); | ||
| if (equiv(e.key, key)) { | ||
| return r(acc, e.index); | ||
| } | ||
| return acc; | ||
| }); | ||
| }; | ||
|
|
||
| export const resultTriples = (graph: TripleStore) => | ||
| map<TripleIds, Set<Triple>>((ids) => { | ||
| const res = new Set<Triple>(); | ||
| for (let id of ids) res.add(graph.triples[id]); | ||
| return res; | ||
| }); | ||
|
|
||
| export const joinSolutions = (n: number) => | ||
| map<IObjectOf<Solutions>, Solutions>((src) => { | ||
| let res: Solutions = src[0]; | ||
| for (let i = 1; i < n && res.size; i++) { | ||
| res = join(res, src[i]); | ||
| } | ||
| return res; | ||
| }); | ||
|
|
||
| export const filterSolutions = (qvars: Iterable<string>) => { | ||
| const filterVars = keySelector([...qvars]); | ||
| return map((sol: Solutions) => { | ||
| const res: Solutions = new Set(); | ||
| for (let s of sol) { | ||
| res.add(filterVars(s)); | ||
| } | ||
| return res; | ||
| }); | ||
| }; | ||
|
|
||
| export const limitSolutions = (n: number) => | ||
| map((sol: Solutions) => { | ||
| if (sol.size <= n) { | ||
| return sol; | ||
| } | ||
| const res: Solutions = new Set(); | ||
| let m = n; | ||
| for (let s of sol) { | ||
| res.add(s); | ||
| if (--m <= 0) break; | ||
| } | ||
| return res; | ||
| }); | ||
|
|
||
| export const bindVars = (bindings: IObjectOf<BindFn>) => | ||
| map((sol: Solutions) => { | ||
| const res: Solutions = new Set(); | ||
| for (let s of sol) { | ||
| s = { ...s }; | ||
| res.add(s); | ||
| for (let b in bindings) { | ||
| s[b] = bindings[b](s); | ||
| } | ||
| } | ||
| return res; | ||
| }); |