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comparison src/graph_queries.ts @ 79:0c188ed3bcd8

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starting lit upgrade. total mess right now
author drewp@bigasterisk.com
date Wed, 17 Nov 2021 13:01:08 -0800
parents 601a604c097a
children
comparison
equal deleted inserted replaced
78:ea9c9db282d6 79:0c188ed3bcd8
1 import { N3Store, NamedNode } from "n3"; 1 // import { DataFactory, Literal, N3Store, NamedNode, Util } from "n3";
2 // const { literal, namedNode } = DataFactory;
2 3
3 export function getStringValue( 4 // // i think this one is a worse subset of graphLiteral, below
4 store: N3Store | undefined, 5 // export function getStringValue(
5 subj: NamedNode, 6 // store: N3Store | undefined,
6 pred: NamedNode, 7 // subj: NamedNode,
7 defaultValue: string = "" 8 // pred: NamedNode,
8 ): string { 9 // defaultValue: string = ""
9 if (store === undefined) { 10 // ): string {
10 // this is so you can use the function before you have a graph 11 // if (store === undefined) {
11 return "..."; 12 // // this is so you can use the function before you have a graph
12 } 13 // return "...";
13 const objs = store.getObjects(subj, pred, null); 14 // }
14 if (objs.length == 0) { 15 // const objs = store.getObjects(subj, pred, null);
15 return defaultValue; 16 // if (objs.length == 0) {
16 } 17 // return defaultValue;
17 return objs[0].value; 18 // }
18 } 19 // return objs[0].value;
20 // }
21
22 // // workaround for uris that don't have good labels in the graph
23 // export function labelFromUri(
24 // uri: NamedNode,
25 // prefix: string,
26 // tailsToLabels: { [key: string]: string },
27 // defaultLabel: string
28 // ) {
29 // let label = defaultLabel === undefined ? uri.value : defaultLabel;
30 // Object.entries(tailsToLabels).forEach(([tail, useLabel]) => {
31 // if (uri.equals(namedNode(prefix + tail))) {
32 // label = useLabel as string;
33 // }
34 // });
35 // return label;
36 // }
37
38 // export function graphLiteral(
39 // store: N3Store,
40 // subj: NamedNode,
41 // pred: string,
42 // notFoundResult?: string
43 // ): Literal {
44 // const keep: Array<Literal> = [];
45 // store.forEach(
46 // q => {
47 // if (!Util.isLiteral(q.object)) {
48 // throw new Error("non literal found");
49 // }
50 // let seen = false;
51 // for (let other of keep) {
52 // // why are we getting multiple matches for the same literal? seems like a bug
53 // if (other.equals(q.object)) {
54 // seen = true;
55 // }
56 // }
57 // if (!seen) {
58 // keep.push(q.object as Literal);
59 // }
60 // },
61 // subj,
62 // namedNode(pred),
63 // null,
64 // null
65 // );
66 // if (keep.length == 0) {
67 // return literal(notFoundResult || "(missing)");
68 // }
69 // if (keep.length == 1) {
70 // return keep[0];
71 // }
72 // console.log(`${subj.value} ${pred} had ${keep.length} objects:`, keep);
73 // return keep[0];
74 // }
75
76 // export function graphUriValue(
77 // store: N3Store,
78 // subj: NamedNode,
79 // pred: string
80 // ): NamedNode | undefined {
81 // const keep: Array<NamedNode> = [];
82 // store.forEach(
83 // q => {
84 // if (!Util.isNamedNode(q.object)) {
85 // throw new Error("non uri found");
86 // }
87 // keep.push(q.object as NamedNode);
88 // },
89 // subj,
90 // namedNode(pred),
91 // null,
92 // null
93 // );
94 // if (keep.length == 0) {
95 // return undefined;
96 // }
97 // if (keep.length == 1) {
98 // return keep[0];
99 // }
100 // throw new Error("found multiple matches for pred");
101 // }