Update FormatTokens conditional, add Token override

Author: tomc128

BooleanExpressionParser/Formatters/BasicFormatter.cs

@@ -9,10 +9,10 @@ public string FormatTokens(IEnumerable<Token> tokens)
     {
         var sb = new StringBuilder();
 
-        foreach (var token in tokens)
+        foreach (Token token in tokens)
         {
             string s = token.ToString()!;
-            if (token is not VariableToken && s.Length > 1) s = $"[[{s}]]";
+            if (token is OperatorToken && s.Length > 1) s = $"[[{s}]]";
             sb.Append(s);
         }
 

BooleanExpressionParser/Formatters/DisplayFormatter.cs

@@ -31,10 +31,10 @@ public string FormatTokens(IEnumerable<Token> tokens)
     {
         var sb = new StringBuilder();
 
-        foreach (var token in tokens)
+        foreach (Token token in tokens)
         {
             string s = token.ToString()!;
-            if (token is not VariableToken && s.Length > 1) s = $"[[{s}]]";
+            if (token is OperatorToken && s.Length > 1) s = $"[[{s}]]";
             sb.Append(s);
         }
 

BooleanExpressionParser/Tokens/OperatorToken.cs

@@ -5,5 +5,5 @@ protected OperatorToken(int precedence)
         Precedence = precedence;
     }
 
-    public int Precedence { get; protected set; }    
+    public int Precedence { get; protected set; }
 }

BooleanExpressionParser/Tokens/Token.cs

@@ -1 +1,4 @@
-abstract class Token { }
+abstract class Token
+{
+    public abstract override string ToString();
+}