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import {
ContextParser,
IJsonLdContextNormalizedRaw,
} from "jsonld-context-parser";
import { v4 } from "uuid";
const contextParser = new ContextParser();
function isObject(value: unknown): value is NodeObject {
return typeof value === "object" && !Array.isArray(value) && value !== null;
}
interface TripleArcs {
[subjectId: string]: {
scopedContexts: IJsonLdContextNormalizedRaw[];
predicates: {
[predicateId: string]: string[];
};
};
}
/**
* Helper function to set the proper tripleArcs values
*/
function setTripleArcs(
tripleArcs: TripleArcs,
subjectId: string,
predicateId: string,
objectId: string
) {
if (!tripleArcs[subjectId]) {
tripleArcs[subjectId] = {
scopedContexts: [],
predicates: {},
};
}
if (!tripleArcs[subjectId].predicates[predicateId]) {
tripleArcs[subjectId].predicates[predicateId] = [];
}
tripleArcs[subjectId].predicates[predicateId].push(objectId);
}
/**
* Helper function to set scopedContext on tripleArcs
*/
function setScopedContext(
tripleArcs: TripleArcs,
subjectId: string,
scopedContext?: IJsonLdContextNormalizedRaw
) {
if (!tripleArcs[subjectId]) {
tripleArcs[subjectId] = {
scopedContexts: [],
predicates: {},
};
}
if (scopedContext) {
tripleArcs[subjectId].scopedContexts.push(scopedContext);
}
}
/**
* Combines multiple contexts together
*/
async function combineContexts(
contexts: IJsonLdContextNormalizedRaw[]
): Promise<IJsonLdContextNormalizedRaw> {
return (await contextParser.parse(contexts)).getContextRaw();
}
/**
* Recursively traverses an object to fill out the idMap and tripleArcs
* @param object The object to traverse
* @param idMap A map between the object Id and a collection of objects representing it
* @param tripleArcs A collection of all the arcs between objects
* @param parentIdPredicates The predicates that are mapped to @ids as defined by the context
* @return the id of the given Node
*/
async function traverseNodesForIdsAndLeafs(
object: NodeObject,
idMap: Record<string, NodeObject[]>,
tripleArcs: TripleArcs,
parentScopedContext?: IJsonLdContextNormalizedRaw,
// All predicates that are made of Ids
parentIdPredicates?: Set<string>
): Promise<string> {
let scopedContext: IJsonLdContextNormalizedRaw | undefined =
parentScopedContext;
// Get the current idPredicates. If this object does
// have a context, then recalculate them.
const idPredicates: Set<string> = parentIdPredicates || new Set<string>();
if (object["@context"]) {
scopedContext =
// The typings for these two libraries disagree, but they are correct
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore
(await contextParser.parse(object["@context"])).getContextRaw();
if (parentScopedContext) {
scopedContext = await combineContexts([
parentScopedContext,
scopedContext,
]);
}
Object.entries(scopedContext).forEach(([key, value]) => {
if (key.charAt(0) === "@") return;
if (isObject(value) && value["@type"] && value["@type"] === "@id") {
idPredicates.add(key);
} else if (idPredicates.has(key)) {
idPredicates.delete(key);
}
});
}
// Record this node's Id
const objectId = object["@id"] || v4();
if (!idMap[objectId]) {
idMap[objectId] = [];
}
idMap[objectId].push(object);
// Traverse the keys of this Object
await Promise.all(
Object.entries(object).map(async ([key, value]) => {
if (key === "@graph") {
// TODO: handle the case the a graph is a string
const graph: NodeObject[] = (
Array.isArray(value) ? value : [value]
) as NodeObject[];
await Promise.all(
graph.map(async (graphValue: NodeObject) => {
await traverseNodesForIdsAndLeafs(
graphValue,
idMap,
tripleArcs,
scopedContext,
idPredicates
);
})
);
}
if (key.charAt(0) === "@") return;
// Save object keys to triplearc
if (isObject(value)) {
const valueId = await traverseNodesForIdsAndLeafs(
value,
idMap,
tripleArcs,
scopedContext,
idPredicates
);
setTripleArcs(tripleArcs, objectId, key, valueId);
} else if (Array.isArray(value)) {
await Promise.all(
value.map(async (arrValue) => {
if (isObject(arrValue)) {
const valueId = await traverseNodesForIdsAndLeafs(
arrValue as NodeObject,
idMap,
tripleArcs,
scopedContext,
idPredicates
);
setTripleArcs(tripleArcs, objectId, key, valueId);
} else if (typeof arrValue === "string" && idPredicates.has(key)) {
setTripleArcs(tripleArcs, objectId, key, arrValue as string);
}
})
);
} else if (typeof value === "string" && idPredicates.has(key)) {
setTripleArcs(tripleArcs, objectId, key, value);
}
})
);
setScopedContext(tripleArcs, objectId, scopedContext);
return objectId;
}
/**
* Converts any JSON-LD object into object literals linked in a graph
* @param jsonLd The JSON-LD document
* @param node The id of the node that should be returned as the root value
*/
export async function json2ObjectGraph<ReturnType extends NodeObject>(
jsonLd: JsonLdDocument,
node: string
): Promise<ReturnType> {
const jsonLdClone = JSON.parse(JSON.stringify(jsonLd));
// Traverse the document, getting the leafs and the ids
const idMap: Record<string, NodeObject[]> = {};
const tripleArcs: TripleArcs = {};
await traverseNodesForIdsAndLeafs(jsonLdClone, idMap, tripleArcs);
// Consolodate all the objects in IdMap into one object
const consolodatedIdMap: Record<string, NodeObject> = {};
Object.entries(idMap).forEach(([key, value]) => {
consolodatedIdMap[key] = value.reduce((agg, newNode) => {
return { ...agg, ...newNode };
}, {});
});
// Get the node to return
const nodeToReturn = consolodatedIdMap[node];
if (!nodeToReturn) {
throw new Error(`Node "${node}" is not in the graph.`);
}
// Link the triple arcs
await Promise.all(
Object.entries(tripleArcs).map(async ([subjectId, subjectInfo]) => {
const subject = consolodatedIdMap[subjectId];
// Construct to @context for this subject
if (subjectInfo.scopedContexts.length > 0) {
// Again, these two library types do not work together, but it's actual fine.
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore
subject["@context"] = await combineContexts(subjectInfo.scopedContexts);
}
// Build the object links
Object.entries(subjectInfo.predicates).forEach(
([predicate, objectIds]) => {
if (
objectIds.length === 1 &&
// Is not a container predicate
!(
subject["@context"] &&
(subject["@context"] as IJsonLdContextNormalizedRaw)[predicate] &&
(subject["@context"] as IJsonLdContextNormalizedRaw)[predicate][
"@container"
]
)
) {
subject[predicate] =
consolodatedIdMap[objectIds[0]] || objectIds[0];
} else {
subject[predicate] = objectIds.map(
(objectId) => consolodatedIdMap[objectId] || objectId
);
}
}
);
})
);
return nodeToReturn as ReturnType;
}
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