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annotate src/layout/graph_queries.ts @ 146:9347277e8311

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try a bit harder to notice <sg-source> children after <streamed-graph> startup
author drewp@bigasterisk.com
date Mon, 08 May 2023 13:52:50 -0700
parents 2468f2227d22
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // import { DataFactory, Literal, N3Store, NamedNode, Util } from "n3";
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2 // const { literal, namedNode } = DataFactory;
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3
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4 // // i think this one is a worse subset of graphLiteral, below
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5 // export function getStringValue(
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6 // store: N3Store | undefined,
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7 // subj: NamedNode,
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8 // pred: NamedNode,
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9 // defaultValue: string = ""
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10 // ): string {
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11 // if (store === undefined) {
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12 // // this is so you can use the function before you have a graph
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13 // return "...";
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14 // }
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15 // const objs = store.getObjects(subj, pred, null);
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16 // if (objs.length == 0) {
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17 // return defaultValue;
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18 // }
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19 // return objs[0].value;
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20 // }
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21
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22 // // workaround for uris that don't have good labels in the graph
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23 // export function labelFromUri(
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24 // uri: NamedNode,
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25 // prefix: string,
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26 // tailsToLabels: { [key: string]: string },
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27 // defaultLabel: string
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28 // ) {
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29 // let label = defaultLabel === undefined ? uri.value : defaultLabel;
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30 // Object.entries(tailsToLabels).forEach(([tail, useLabel]) => {
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31 // if (uri.equals(namedNode(prefix + tail))) {
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32 // label = useLabel as string;
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33 // }
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34 // });
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35 // return label;
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36 // }
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37
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38 // export function graphLiteral(
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39 // store: N3Store,
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40 // subj: NamedNode,
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41 // pred: string,
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42 // notFoundResult?: string
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43 // ): Literal {
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44 // const keep: Array<Literal> = [];
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45 // store.forEach(
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46 // q => {
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47 // if (!Util.isLiteral(q.object)) {
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48 // throw new Error("non literal found");
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49 // }
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50 // let seen = false;
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51 // for (let other of keep) {
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52 // // why are we getting multiple matches for the same literal? seems like a bug
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53 // if (other.equals(q.object)) {
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54 // seen = true;
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55 // }
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56 // }
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57 // if (!seen) {
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58 // keep.push(q.object as Literal);
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59 // }
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60 // },
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61 // subj,
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62 // namedNode(pred),
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63 // null,
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64 // null
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65 // );
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66 // if (keep.length == 0) {
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67 // return literal(notFoundResult || "(missing)");
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68 // }
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69 // if (keep.length == 1) {
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70 // return keep[0];
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71 // }
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72 // console.log(`${subj.value} ${pred} had ${keep.length} objects:`, keep);
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73 // return keep[0];
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74 // }
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75
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76 // export function graphUriValue(
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77 // store: N3Store,
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78 // subj: NamedNode,
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79 // pred: string
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80 // ): NamedNode | undefined {
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81 // const keep: Array<NamedNode> = [];
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82 // store.forEach(
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83 // q => {
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84 // if (!Util.isNamedNode(q.object)) {
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85 // throw new Error("non uri found");
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86 // }
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87 // keep.push(q.object as NamedNode);
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88 // },
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89 // subj,
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90 // namedNode(pred),
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91 // null,
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92 // null
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93 // );
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94 // if (keep.length == 0) {
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95 // return undefined;
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96 // }
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97 // if (keep.length == 1) {
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98 // return keep[0];
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99 // }
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100 // throw new Error("found multiple matches for pred");
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101 // }