JSON-LD parser connector for rdflib when not needing to support { termType: 'Collection' }

jsonld-parser.js

function convertTerm (kb, term) {
  switch (term.termType) {
    case 'BlankNode':
      return kb.rdfFactory.blankNode(term.value);
    case 'NamedNode':
      return kb.rdfFactory.namedNode(term.value);
    case 'Literal':
      return kb.rdfFactory.literal(term.value, term.language || convertTerm(kb, term.datatype));
    case 'DefaultGraph':
      return kb.rdfFactory.defaultGraph();
    default:
      throw new Error(`Unknown term type '${term.termType}'`)
  }
}

function parse(str, kb, base, callback) {
  const baseString = base && Object.prototype.hasOwnProperty.call(base, 'termType')
    ? base.value
    : base

    return jsonld
      .toRDF(JSON.parse(str), { base: baseString })
      .then((dataset) => dataset.map((quad) => kb.rdfFactory.quad(
          convertTerm(kb, quad.subject),
          convertTerm(kb, quad.predicate),
          convertTerm(kb, quad.object),
          convertTerm(kb, quad.graph),
      )))
      .then(callback)
      .catch(callback);
}