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comparison service/wifi/src/graph_access.ts @ 1480:ae023bba2104

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refactor plain graph functions from lit-element Ignore-this: db67b7d211f72ba9d14b0d490f7dc9da darcs-hash:88cdb343d3f5e47f06e2737402ef48257b0f80e9
author drewp <drewp@bigasterisk.com>
date Mon, 06 Jan 2020 22:39:46 -0800
parents
children 50d66febeeb0
comparison
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1479:ad9ec466ba6d 1480:ae023bba2104
1 import { Literal, N3Store, Util, NamedNode, DataFactory } from "n3";
2 const { literal, namedNode } = DataFactory;
3
4 // workaround for uris that don't have good labels in the graph
5 export function labelFromUri(
6 uri: NamedNode,
7 prefix: string,
8 tailsToLabels: { [key: string]: string },
9 defaultLabel: string
10 ) {
11 let label = defaultLabel === undefined ? uri.value : defaultLabel;
12 Object.entries(tailsToLabels).forEach(([tail, useLabel]) => {
13 if (uri.equals(namedNode(prefix + tail))) {
14 label = useLabel as string;
15 }
16 });
17 return label;
18 }
19
20 export function graphLiteral(
21 store: N3Store,
22 subj: NamedNode,
23 pred: string,
24 notFoundResult?: string
25 ): Literal {
26 const keep: Array<Literal> = [];
27 store.forEach(
28 q => {
29 if (!Util.isLiteral(q.object)) {
30 throw new Error("non literal found");
31 }
32 let seen = false;
33 for (let other of keep) {
34 if (other.equals(q.object)) {
35 seen = true;
36 }
37 }
38 if (!seen) {
39 keep.push(q.object as Literal);
40 }
41 },
42 subj,
43 namedNode(pred),
44 null,
45 null
46 );
47 if (keep.length == 0) {
48 return literal(notFoundResult || "(missing)");
49 }
50 if (keep.length == 1) {
51 return keep[0];
52 }
53 console.log(`${subj.value} ${pred} had ${keep.length} objects:`, keep);
54 return keep[0];
55 }
56
57 export function graphUriValue(
58 store: N3Store,
59 subj: NamedNode,
60 pred: string
61 ): NamedNode | undefined {
62 const keep: Array<NamedNode> = [];
63 store.forEach(
64 q => {
65 if (!Util.isNamedNode(q.object)) {
66 throw new Error("non uri found");
67 }
68 keep.push(q.object as NamedNode);
69 },
70 subj,
71 namedNode(pred),
72 null,
73 null
74 );
75 if (keep.length == 0) {
76 return undefined;
77 }
78 if (keep.length == 1) {
79 return keep[0];
80 }
81 throw new Error("found multiple matches for pred");
82 }