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1586
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1 import { Literal, N3Store, Util, NamedNode, DataFactory } from "n3";
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2 const { literal, namedNode } = DataFactory;
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3
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4 // workaround for uris that don't have good labels in the graph
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5 export function labelFromUri(
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6 uri: NamedNode,
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7 prefix: string,
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8 tailsToLabels: { [key: string]: string },
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9 defaultLabel: string
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10 ) {
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11 let label = defaultLabel === undefined ? uri.value : defaultLabel;
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12 Object.entries(tailsToLabels).forEach(([tail, useLabel]) => {
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13 if (uri.equals(namedNode(prefix + tail))) {
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14 label = useLabel as string;
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15 }
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16 });
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17 return label;
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18 }
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19
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20 export function graphLiteral(
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21 store: N3Store,
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22 subj: NamedNode,
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23 pred: string,
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24 notFoundResult?: string
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25 ): Literal {
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26 const keep: Array<Literal> = [];
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27 store.forEach(
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28 q => {
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29 if (!Util.isLiteral(q.object)) {
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30 throw new Error("non literal found");
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31 }
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32 let seen = false;
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33 for (let other of keep) {
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34 // why are we getting multiple matches for the same literal? seems like a bug
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35 if (other.equals(q.object)) {
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36 seen = true;
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37 }
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38 }
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39 if (!seen) {
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40 keep.push(q.object as Literal);
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41 }
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42 },
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43 subj,
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44 namedNode(pred),
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45 null,
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46 null
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47 );
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48 if (keep.length == 0) {
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49 return literal(notFoundResult || "(missing)");
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50 }
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51 if (keep.length == 1) {
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52 return keep[0];
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53 }
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54 console.log(`${subj.value} ${pred} had ${keep.length} objects:`, keep);
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55 return keep[0];
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56 }
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57
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58 export function graphUriValue(
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59 store: N3Store,
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60 subj: NamedNode,
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61 pred: string
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62 ): NamedNode | undefined {
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63 const keep: Array<NamedNode> = [];
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64 store.forEach(
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65 q => {
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66 if (!Util.isNamedNode(q.object)) {
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67 throw new Error("non uri found");
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68 }
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69 keep.push(q.object as NamedNode);
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70 },
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71 subj,
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72 namedNode(pred),
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73 null,
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74 null
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75 );
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76 if (keep.length == 0) {
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77 return undefined;
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78 }
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79 if (keep.length == 1) {
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80 return keep[0];
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81 }
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82 throw new Error("found multiple matches for pred");
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83 }
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