// import { DataFactory, Literal, N3Store, NamedNode, Util } from "n3";
// const { literal, namedNode } = DataFactory;

// // i think this one is a worse subset of graphLiteral, below
// export function getStringValue(
//   store: N3Store | undefined,
//   subj: NamedNode,
//   pred: NamedNode,
//   defaultValue: string = ""
// ): string {
//   if (store === undefined) {
//     // this is so you can use the function before you have a graph
//     return "...";
//   }
//   const objs = store.getObjects(subj, pred, null);
//   if (objs.length == 0) {
//     return defaultValue;
//   }
//   return objs[0].value;
// }

// // workaround for uris that don't have good labels in the graph
// export function labelFromUri(
//   uri: NamedNode,
//   prefix: string,
//   tailsToLabels: { [key: string]: string },
//   defaultLabel: string
// ) {
//   let label = defaultLabel === undefined ? uri.value : defaultLabel;
//   Object.entries(tailsToLabels).forEach(([tail, useLabel]) => {
//     if (uri.equals(namedNode(prefix + tail))) {
//       label = useLabel as string;
//     }
//   });
//   return label;
// }

// export function graphLiteral(
//   store: N3Store,
//   subj: NamedNode,
//   pred: string,
//   notFoundResult?: string
// ): Literal {
//   const keep: Array<Literal> = [];
//   store.forEach(
//     q => {
//       if (!Util.isLiteral(q.object)) {
//         throw new Error("non literal found");
//       }
//       let seen = false;
//       for (let other of keep) {
//         // why are we getting multiple matches for the same literal? seems like a bug
//         if (other.equals(q.object)) {
//           seen = true;
//         }
//       }
//       if (!seen) {
//         keep.push(q.object as Literal);
//       }
//     },
//     subj,
//     namedNode(pred),
//     null,
//     null
//   );
//   if (keep.length == 0) {
//     return literal(notFoundResult || "(missing)");
//   }
//   if (keep.length == 1) {
//     return keep[0];
//   }
//   console.log(`${subj.value} ${pred} had ${keep.length} objects:`, keep);
//   return keep[0];
// }

// export function graphUriValue(
//   store: N3Store,
//   subj: NamedNode,
//   pred: string
// ): NamedNode | undefined {
//   const keep: Array<NamedNode> = [];
//   store.forEach(
//     q => {
//       if (!Util.isNamedNode(q.object)) {
//         throw new Error("non uri found");
//       }
//       keep.push(q.object as NamedNode);
//     },
//     subj,
//     namedNode(pred),
//     null,
//     null
//   );
//   if (keep.length == 0) {
//     return undefined;
//   }
//   if (keep.length == 1) {
//     return keep[0];
//   }
//   throw new Error("found multiple matches for pred");
// }