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annotate src/layout/json_ld_quads.ts @ 128:5a1a79f54779

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big rewrite
author drewp@bigasterisk.com
date Fri, 05 May 2023 21:26:36 -0700
parents 2468f2227d22
children
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128
5a1a79f54779 big rewrite
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1 // unused?
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2
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3 import * as jsonld from "jsonld";
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4 import { JsonLd, JsonLdArray } from "jsonld/jsonld-spec";
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5 import { Quad, NamedNode, DataFactory } from "n3";
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6 const { literal, quad, namedNode } = DataFactory;
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7
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8 // const { rdf } = ns;
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9 const rdf = { type: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" };
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10
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11 function parseObjNode(obj: any) {
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12 if (obj["@id"]) {
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13 return namedNode(obj["@id"]);
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14 } else {
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15 if (obj["@value"] === undefined) {
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16 throw new Error("no @id or @value");
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17 }
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18 return literal(obj["@value"], obj["@language"] || obj["@type"]);
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19 }
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20 }
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21
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22 function parsePred(
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23 onQuad: (q: Quad) => void,
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24 graphNode: NamedNode,
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25 subjNode: NamedNode,
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26 predKey: string,
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27 subjGroup: any
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28 ) {
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29 let predNode: NamedNode;
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30 if (predKey === "@type") {
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31 subjGroup["@type"].forEach((aType: string) => {
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32 onQuad(quad(subjNode, namedNode(rdf.type), namedNode(aType), graphNode));
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33 });
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34 return;
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35 }
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36 predNode = namedNode(predKey);
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37 subjGroup[predKey].forEach(function(obj: any) {
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38 const objNode = parseObjNode(obj);
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39 onQuad(quad(subjNode, predNode, objNode, graphNode));
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40 });
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41 }
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42 function parseSubj(
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43 onQuad: (q: Quad) => void,
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44 graphNode: NamedNode,
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45 subjGroup: { [predOrId: string]: any }
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46 ) {
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47 const subjNode = namedNode(subjGroup["@id"]);
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48 for (let predKey in subjGroup) {
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49 if (predKey === "@id") {
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50 continue;
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51 }
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52 parsePred(onQuad, graphNode, subjNode, predKey, subjGroup);
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53 }
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54 }
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55 function parseGraph(onQuad: (q: Quad) => void, g: JsonLd) {
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56 var graph = (g as { "@id": string })["@id"];
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57 var graphNode = namedNode(graph);
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58 (g as { "@graph": JsonLdArray })["@graph"].forEach(subj => {
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59 parseSubj(onQuad, graphNode, subj);
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60 });
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61 }
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62
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63 export async function eachJsonLdQuad(
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64 jsonLdObj: object,
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65 onQuad: (q: Quad) => void
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66 ) {
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67 const expanded = await jsonld.expand(jsonLdObj);
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68 (expanded as JsonLdArray).forEach((g: JsonLd) => parseGraph(onQuad, g));
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69 }