Fix #286 - does not work

sys27 · Aug 29, 2020 · fea5984 · fea5984
1 parent e50b5e1
commit fea5984
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Showing 2 changed files with 17 additions and 1 deletion.
diff --git a/xFunc.Maths/Parser.cs b/xFunc.Maths/Parser.cs
@@ -581,7 +581,7 @@ private IExpression Exponentiation(TokenReader tokenReader)
             if (@operator == null)
                 return left;
 
-            var right = Exponentiation(tokenReader) ??
+            var right = LeftUnary(tokenReader) ??
                         throw new ParseException(Resource.ExponentParseException);
 
             return CreateExponentiation(left, right);

diff --git a/xFunc.Tests/ParserTests/ParserTest.cs b/xFunc.Tests/ParserTests/ParserTest.cs
@@ -2192,5 +2192,21 @@ public void ImplicitMulAndPowerVariable()
 
             Assert.Equal(expected, exp);
         }
+
+        [Fact]
+        public void PowerWithUnaryMinus()
+        {
+            var tokens = Builder()
+                .Number(2)
+                .Operation(OperatorToken.Exponentiation)
+                .Operation(OperatorToken.Minus)
+                .Number(2)
+                .Tokens;
+
+            var exp = parser.Parse(tokens);
+            var expected = new Pow(Number.Two, new UnaryMinus(Number.Two));
+
+            Assert.Equal(expected, exp);
+        }
     }
 }