BasicArithmeticalExpression: Added additional logic to handle cases such as -sin(5).

Author: artemlos

MathParser/MathParser.cs

@@ -527,7 +527,7 @@ private decimal BasicArithmeticalExpression(List<string> tokens)
                     var op = tokens[0];
 
                     if (op == "-" || op == "+")
-                        return decimal.Parse((op == "+" ? "" : "-") + tokens[1], CultureInfo);
+                        return decimal.Parse((op == "+" ? "" :  (tokens[1].Substring(0,1) == "-" ? "" : "-" ) ) + tokens[1], CultureInfo);
 
                     return OperatorAction[op](0, decimal.Parse(tokens[1], CultureInfo));
                 }

MathParser/UnitTest/BugFixes.cs

@@ -0,0 +1,16 @@
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTest
+{
+    [TestClass]
+    public class BugFixes
+    {
+        [TestMethod]
+        public void UnaryOperators()
+        {
+            var mp = new Mathos.Parser.MathParser();
+            var result = mp.Parse("-sin(5)");
+        }
+    }
+}

MathParser/UnitTest/UnitTest.csproj

@@ -59,6 +59,7 @@
   <ItemGroup>
     <Compile Include="UnitTest1.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="BugFixes.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\MathParser.csproj">