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annotate src/json_ld_quads.ts @ 46:709e305dbd4f

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bug on rdf:type stmts, i think, so I refactored a bunch and now maybe it's more testable and typeable
author drewp@bigasterisk.com
date Sun, 05 Jan 2020 23:54:00 -0800
parents 8b4dc9e87b56
children 77aa2e9234ed
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1 import * as jsonld from "jsonld";
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2 import { JsonLd, JsonLdArray } from "jsonld/jsonld-spec";
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3 import { Quad, NamedNode, DataFactory } from "n3";
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4 const { literal, quad, namedNode } = DataFactory;
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5
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6 // const { rdf } = ns;
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7 const rdf = { type: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" };
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9 function parseObjNode(obj: any) {
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10 if (obj["@id"]) {
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11 return namedNode(obj["@id"]);
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12 } else {
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13 if (obj["@value"] === undefined) {
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14 throw new Error("no @id or @value");
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15 }
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16 return literal(obj["@value"], obj["@language"] || obj["@type"]);
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17 }
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18 }
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19
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20 function parsePred(
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21 onQuad: (q: Quad) => void,
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22 graphNode: NamedNode,
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23 subjNode: NamedNode,
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24 predKey: string,
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25 subjGroup: any
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26 ) {
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27 let predNode: NamedNode;
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28 if (predKey === "@type") {
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29 onQuad(
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30 quad(
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31 subjNode,
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32 namedNode(rdf.type),
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33 namedNode(subjGroup["@type"]),
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34 graphNode
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35 )
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36 );
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37 return;
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38 }
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39 predNode = namedNode(predKey);
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40 subjGroup[predKey].forEach(function(obj: any) {
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41 const objNode = parseObjNode(obj);
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42 onQuad(quad(subjNode, predNode, objNode, graphNode));
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43 });
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44 }
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45 function parseSubj(
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46 onQuad: (q: Quad) => void,
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47 graphNode: NamedNode,
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48 subjGroup: { [predOrId: string]: any }
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49 ) {
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50 const subjNode = namedNode(subjGroup["@id"]);
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51 for (let predKey in subjGroup) {
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52 if (predKey === "@id") {
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53 continue;
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54 }
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55 parsePred(onQuad, graphNode, subjNode, predKey, subjGroup);
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56 }
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57 }
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58 function parseGraph(onQuad: (q: Quad) => void, g: JsonLd) {
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59 var graph = (g as { "@id": string })["@id"];
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60 var graphNode = namedNode(graph);
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61 (g as { "@graph": JsonLdArray })["@graph"].forEach(subj => {
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62 parseSubj(onQuad, graphNode, subj);
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63 });
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64 }
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65
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66 export async function eachJsonLdQuad(
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67 jsonLdObj: object,
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68 onQuad: (q: Quad) => void
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69 ) {
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70 const expanded = await jsonld.expand(jsonLdObj);
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71 (expanded as JsonLdArray).forEach((g: JsonLd) => parseGraph(onQuad, g));
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72 }