@bahulneel/rdflib/lib/jsonldparser.js

an RDF library for node.js. Suitable for client and server side.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.jsonldObjectToTerm = jsonldObjectToTerm;
exports.default = jsonldParser;

var _jsonld = _interopRequireDefault(require("jsonld"));

var _utils = require("./utils");

/**
 * Parses json-ld formatted JS objects to a rdf Term.
 * @param kb - The DataFactory to use.
 * @param obj - The json-ld object to process.
 * @return {Literal|NamedNode|BlankNode|Collection}
 */
function jsonldObjectToTerm(kb, obj) {
  if (typeof obj === 'string') {
    return kb.rdfFactory.literal(obj);
  }

  if (Object.prototype.hasOwnProperty.call(obj, '@list')) {
    if (kb.rdfFactory.supports["COLLECTIONS"] === true) {
      return listToCollection(kb, obj['@list']);
    }

    return listToStatements(kb, obj);
  }

  if (Object.prototype.hasOwnProperty.call(obj, '@id')) {
    return kb.rdfFactory.namedNode(obj['@id']);
  }

  if (Object.prototype.hasOwnProperty.call(obj, '@language')) {
    return kb.rdfFactory.literal(obj['@value'], obj['@language']);
  }

  if (Object.prototype.hasOwnProperty.call(obj, '@type')) {
    return kb.rdfFactory.literal(obj['@value'], kb.rdfFactory.namedNode(obj['@type']));
  }

  if (Object.prototype.hasOwnProperty.call(obj, '@value')) {
    return kb.rdfFactory.literal(obj['@value']);
  }

  return kb.rdfFactory.literal(obj);
}
/**
 * Adds the statements in a json-ld list object to {kb}.
 */


function listToStatements(kb, obj) {
  var listId = obj['@id'] ? kb.rdfFactory.namedNode(obj['@id']) : kb.rdfFactory.blankNode();
  var items = obj['@list'].map(function (listItem) {
    return jsonldObjectToTerm(kb, listItem);
  });
  var statements = (0, _utils.arrayToStatements)(kb.rdfFactory, listId, items);
  kb.addAll(statements);
  return listId;
}

function listToCollection(kb, obj) {
  if (!Array.isArray(obj)) {
    throw new TypeError("Object must be an array");
  }

  return kb.rdfFactory.collection(obj.map(function (o) {
    return jsonldObjectToTerm(kb, o);
  }));
}
/**
 * Takes a json-ld formatted string {str} and adds its statements to {kb}.
 *
 * Ensure that {kb.rdfFactory} is a DataFactory.
 */


function jsonldParser(str, kb, base, callback) {
  var baseString = base && Object.prototype.hasOwnProperty.call(base, 'termType') ? base.value : base;
  return _jsonld.default.flatten(JSON.parse(str), null, {
    base: baseString
  }).then(function (flattened) {
    return flattened.reduce(function (store, flatResource) {
      var id = flatResource['@id'] ? kb.rdfFactory.namedNode(flatResource['@id']) : kb.rdfFactory.blankNode();

      for (var _i = 0, _Object$keys = Object.keys(flatResource); _i < _Object$keys.length; _i++) {
        var property = _Object$keys[_i];

        if (property === '@id') {
          continue;
        }

        var value = flatResource[property];

        if (Array.isArray(value)) {
          for (var i = 0; i < value.length; i++) {
            kb.addStatement(kb.rdfFactory.quad(id, kb.rdfFactory.namedNode(property), jsonldObjectToTerm(kb, value[i])));
          }
        } else {
          kb.addStatement(kb.rdfFactory.quad(id, kb.rdfFactory.namedNode(property), jsonldObjectToTerm(kb, value)));
        }
      }

      return kb;
    }, kb);
  }).then(callback).catch(callback);
}