fix: escape datatype literal values

Author: bergos

lib/TermSerializer.js

@@ -1,5 +1,6 @@
 import TermMap from '@rdfjs/term-map'
 import toNT from '@rdfjs/to-ntriples'
+import * as ns from './namespaces.js'
 import {
   isBoolean,
   isDecimal,
@@ -44,10 +45,15 @@ class TermSerializer {
           return term.value
         }
       } else if (!isLangString(term) && !isString(term)) {
+        const escaped = toNT({
+          datatype: ns.xsd.string,
+          termType: 'Literal',
+          value: term.value
+        })
         const shrinked = this.prefixes.shrink(term.datatype)
 
         if (shrinked) {
-          return `"${term.value}"^^${shrinked.value}`
+          return `${escaped}^^${shrinked.value}`
         }
       }
     }

test/assets/literal-datatype.nt

@@ -0,0 +1 @@
+<http://example.org/resourceA> <http://example.org/propertyA> "a\"b\\c\nd\r"^^<http://example.org/datatypeA> .

test/assets/literal-datatype.ttl

@@ -0,0 +1,4 @@
+@prefix ex: <http://example.org/>.
+
+ex:resourceA
+  ex:propertyA "a\"b\\c\nd\r"^^ex:datatypeA.

test/test.js

@@ -24,6 +24,7 @@ const tests = [
   'list-multi-ref',
   'literal',
   'literal-boolean',
+  'literal-datatype',
   'literal-decimal',
   'literal-double',
   'literal-integer',
@@ -50,6 +51,11 @@ const options = {
     filename: 'base',
     baseIRI: new URL('http://example.com/')
   },
+  'literal-datatype': {
+    prefixes: [
+      ['ex', rdf.namedNode('http://example.org/')]
+    ]
+  },
   prefix: {
     prefixes: [
       ['xsd', rdf.namedNode('http://www.w3.org/2001/XMLSchema#')],