Wrap JSON literal parsing errors.

Author: davidlehn

lib/fromRdf.js

@@ -3,6 +3,7 @@
  */
 'use strict';
 
+const JsonLdError = require('./JsonLdError');
 const graphTypes = require('./graphTypes');
 const types = require('./types');
 const util = require('./util');
@@ -288,7 +289,14 @@ function _RDFToObject(o, useNativeTypes) {
     }
     if(type === RDF_JSON_LITERAL) {
       type = '@json';
-      rval['@value'] = JSON.parse(rval['@value']);
+      try {
+        rval['@value'] = JSON.parse(rval['@value']);
+      } catch(e) {
+        throw new JsonLdError(
+          'JSON literal could not be parsed.',
+          'jsonld.InvalidJsonLiteral',
+          {code: 'invalid JSON literal', value: rval['@value'], cause: e});
+      }
     }
     // use native types for certain xsd types
     if(useNativeTypes) {

tests/misc.js

@@ -519,3 +519,20 @@ describe('js keywords', () => {
     assert.deepStrictEqual(e, ex);
   });
 });
+
+describe.only('literal JSON', () => {
+  it('handles error', done => {
+    const d =
+'_:b0 <ex:p> "bogus"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#JSON> .'
+;
+    const p = jsonld.fromRDF(d);
+    assert(p instanceof Promise);
+    p.then(() => {
+      assert.fail();
+    }).catch(e => {
+      assert(e);
+      assert.equal(e.name, 'jsonld.InvalidJsonLiteral');
+      done();
+    });
+  });
+});