More tokens

VAR.ExpressionEvaluator.Tests/TokenizerTests.cs

@@ -174,5 +174,43 @@ namespace VAR.ExpressionEvaluator.Tests
 
             Assert.AreEqual(t.Token, Token.EOF);
         }
+
+        [TestMethod()]
+        public void Tokenizer__MoreTokens()
+        {
+            var testString = "= < > <= >= == === ";
+            var t = new Tokenizer(new StringReader(testString));
+
+            // "="
+            Assert.AreEqual(t.Token, Token.Equals);
+            t.NextToken();
+
+            // "<"
+            Assert.AreEqual(t.Token, Token.LessThan);
+            t.NextToken();
+
+            // ">"
+            Assert.AreEqual(t.Token, Token.GreaterThan);
+            t.NextToken();
+
+            // "<="
+            Assert.AreEqual(t.Token, Token.LessOrEqualThan);
+            t.NextToken();
+
+            // ">="
+            Assert.AreEqual(t.Token, Token.GreaterOrEqualThan);
+            t.NextToken();
+
+            // "=="
+            Assert.AreEqual(t.Token, Token.Equals);
+            t.NextToken();
+
+            // "==="
+            Assert.AreEqual(t.Token, Token.ExclusiveEquals);
+            t.NextToken();
+
+            Assert.AreEqual(t.Token, Token.EOF);
+        }
+
     }
 }

VAR.ExpressionEvaluator/Tokenizer.cs

@@ -12,6 +12,11 @@ namespace VAR.ExpressionEvaluator
         Division,
         Multiply,
         Equals,
+        ExclusiveEquals,
+        GreaterThan,
+        GreaterOrEqualThan,
+        LessThan,
+        LessOrEqualThan,
         ParentesisStart,
         ParentesisEnd,
         Keyword,
@@ -119,6 +124,35 @@ namespace VAR.ExpressionEvaluator
                 case '=':
                     NextChar();
                     _currentToken = Token.Equals;
+                    if (_currentChar == '=')
+                    {
+                        NextChar();
+                        if (_currentChar == '=')
+                        {
+                            NextChar();
+                            _currentToken = Token.ExclusiveEquals;
+                        }
+                    }
+                    return;
+
+                case '>':
+                    NextChar();
+                    _currentToken = Token.GreaterThan;
+                    if (_currentChar == '=')
+                    {
+                        NextChar();
+                        _currentToken = Token.GreaterOrEqualThan;
+                    }
+                    return;
+
+                case '<':
+                    NextChar();
+                    _currentToken = Token.LessThan;
+                    if (_currentChar == '=')
+                    {
+                        NextChar();
+                        _currentToken = Token.LessOrEqualThan;
+                    }
                     return;
             }