Add tests for issue lark-parser#1283

chanicpanic · Aug 1, 2023 · 1b6c1dd · 1b6c1dd
1 parent 656334c
commit 1b6c1dd
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/tests/test_parser.py b/tests/test_parser.py
@@ -916,7 +916,26 @@ def test_cycles_with_child_filter(self):
             tree = l.parse('');
             self.assertEqual(tree, Tree('a', [Tree('x', [Tree('b', [])])]))
 
+        def test_resolve_ambiguity_with_shared_node(self):
+            grammar = """
+            start: (a+)*
+            !a.1: "A" |
+            """
+
+            l = Lark(grammar, ambiguity='resolve', lexer=LEXER)
+            tree = l.parse("A")
+            self.assertEqual(tree, Tree('start', [Tree('a', []), Tree('a', []), Tree('a', ['A'])]))
 
+        def test_resolve_ambiguity_with_shared_node2(self):
+            grammar = """
+            start: _s x _s
+            x: "X"?
+            _s: " "?
+            """
+
+            l = Lark(grammar, ambiguity='resolve', lexer=LEXER)
+            tree = l.parse("")
+            self.assertEqual(tree, Tree('start', [Tree('x', [])]))