Parse subject and predicate literals in N3

src/N3Parser.js

@@ -266,6 +266,18 @@ export default class N3Parser {
     case 'abbreviation':
       this._predicate = this.ABBREVIATIONS[token.value];
       break;
+    case 'literal':
+      if (!this._n3Mode)
+        return this._error('Unexpected literal', token);
+
+      if (token.prefix.length === 0) {
+        this._literalValue = token.value;
+        return this._completePredicateLiteral;
+      }
+      else
+        this._predicate = this._literal(token.value, this._namedNode(token.prefix));
+
+      break;
     case '.':
     case ']':
     case '}':
@@ -547,8 +559,30 @@ export default class N3Parser {
 
   // Completes a literal in subject position
   _completeSubjectLiteral(token) {
-    this._subject = this._completeLiteral(token).literal;
-    return this._readPredicateOrNamedGraph;
+    const completed = this._completeLiteral(token);
+
+    this._subject = completed.literal;
+    // If the token was consumed, continue with the rest of the input
+    if (completed.token === null)
+      return this._readPredicateOrNamedGraph;
+    // Otherwise, consume the token now
+    else {
+      return this._readPredicateOrNamedGraph(completed.token);
+    }
+  }
+
+  // Completes a literal in subject position
+  _completePredicateLiteral(token) {
+    const completed = this._completeLiteral(token);
+
+    this._predicate = completed.literal;
+    // If the token was consumed, continue with the rest of the input
+    if (completed.token === null)
+      return this._readObject;
+    // Otherwise, consume the token now
+    else {
+      return this._readObject(completed.token);
+    }
   }
 
   // Completes a literal in object position

test/N3Parser-test.js

@@ -81,6 +81,12 @@ describe('Parser', () => {
                   ['noturn:a', 'noturn:b', '"x"^^urn:foo'],
                   ['noturn:a', 'noturn:b', '"x"^^noturn:urn:foo']));
 
+    it('should not parse literals with datatype as predicate',
+      shouldNotParse('<greaterThan> "a"^^<c> "b"^^<c>.', 'Unexpected literal on line 1.'));
+
+    it('should not parse literals without datatype as predicate',
+        shouldNotParse('<greaterThan> "a" "b".', 'Unexpected literal on line 1.'));
+
     it('should not parse a triple with a literal and a prefixed name type with an inexistent prefix',
       shouldNotParse('<a> <b> "string"^^x:z.',
                      'Undefined prefix "x:" on line 1.', {
@@ -1756,12 +1762,72 @@ describe('Parser', () => {
             ['"1"^^http://www.w3.org/2001/XMLSchema#integer', 'greaterThan', '"0"^^http://www.w3.org/2001/XMLSchema#integer', '_:b0']
         ));
 
+
     it('should parse literals with datatype as subject',
+        shouldParse(parser, '"a"^^<c> <greaterThan> <d>.',
+            ['"a"^^http://example.org/c', 'greaterThan', 'd']
+        ));
+
+
+    it('should parse literals with datatype as subject and object',
+        shouldParse(parser, '"a"^^<c> <greaterThan> "b"^^<c>.',
+            ['"a"^^http://example.org/c', 'greaterThan', '"b"^^http://example.org/c']
+        ));
+
+    it('should parse literals without datatype as subject and object',
+        shouldParse(parser, '"a" <greaterThan> "b".',
+            ['"a"', 'greaterThan', '"b"']
+        ));
+
+    it('should parse literals without datatype as subject',
+        shouldParse(parser, '"a" <greaterThan> <b>.',
+            ['"a"', 'greaterThan', 'b']
+        ));
+
+    it('should parse literals with datatype as predicate',
+        shouldParse(parser, '<greaterThan> "a"^^<c> "b"^^<c>.',
+            ['greaterThan', '"a"^^http://example.org/c', '"b"^^http://example.org/c']
+        ));
+
+    it('should parse literals without datatype as predicate',
+        shouldParse(parser, '<greaterThan> "a" "b".',
+            ['greaterThan', '"a"', '"b"']
+        ));
+
+    it('should parse subject predicate and object as integer',
+        shouldParse(parser, '1 1 1.',
+            ['"1"^^http://www.w3.org/2001/XMLSchema#integer', '"1"^^http://www.w3.org/2001/XMLSchema#integer', '"1"^^http://www.w3.org/2001/XMLSchema#integer']
+        ));
+
+    it('should parse literals with integer as predicate',
+        shouldParse(parser, '<greaterThan> 1 "b".',
+            ['greaterThan', '"1"^^http://www.w3.org/2001/XMLSchema#integer', '"b"']
+        ));
+
+    it('should parse literals with datatype as predicate in graph',
+        shouldParse(parser, '<x> <y> {<greaterThan> "a"^^<c> "b"^^<c>}.',
+            ['x', 'y', '_:b0'],
+            ['greaterThan', '"a"^^http://example.org/c', '"b"^^http://example.org/c', '_:b0']
+        ));
+
+    it('should parse literals without datatype as predicate in graph',
+        shouldParse(parser, '<x> <y> {<greaterThan> "a" "b"}.',
+            ['x', 'y', '_:b0'],
+            ['greaterThan', '"a"', '"b"', '_:b0']
+        ));
+
+    it('should parse literals with datatype as subject in graph',
         shouldParse(parser, '<a> <b> {"a"^^<c> <greaterThan> "b"^^<c>}.',
             ['a', 'b', '_:b0'],
             ['"a"^^http://example.org/c', 'greaterThan', '"b"^^http://example.org/c', '_:b0']
         ));
 
+    it('should parse literals without datatype as subject in graph',
+        shouldParse(parser, '<a> <b> {"a" <greaterThan> "b"}.',
+            ['a', 'b', '_:b0'],
+            ['"a"', 'greaterThan', '"b"', '_:b0']
+        ));
+
     it('should parse literals with language as subject',
         shouldParse(parser, '<a> <b> {"bonjour"@fr <sameAs> "hello"@en}.',
             ['a', 'b', '_:b0'],