anchor.diff:          expressionStack.add(currentExpression);
           continue;
         }
  -      
  -      if(currentToken.type == TokenType.UNMINUS){
  +
  +      if(currentToken.type == TokenType.UNMINUS) {
           Expression operand = expressionStack.last;
           expressionStack.removeLast();
           Expression currentExpression = - operand;
           expressionStack.add(currentExpression);
           continue;
         }
  - 
  -      if(currentToken.type == TokenType.LOG){
  +
  +      if(currentToken.type == TokenType.LOG) {
           Expression rightOperand = expressionStack.last;
           expressionStack.removeLast();
           Expression leftOperand = expressionStack.last;
  
positive.code:       /* if the current Tokens type is MINUS and the last Token in the operator buffer is of type LBRACE
         * the current Token is an unary minus, so the tokentype has to be changed.
         */
        if(tempToken.type == TokenType.MINUS && operatorBuffer.last.type == TokenType.LBRACE){
          Token newToken = new Token(tempToken.text, TokenType.UNMINUS);
          operatorBuffer.add(newToken);
          continue;
  
negative.code:   static final TokenType LN = const TokenType("LN",3);
    static final TokenType EFUNC = const TokenType("EFUNC",3);
  
    final String value;
    final int priority;
  
    const TokenType(String this.value, int this.priority);
  
    String toString() {
      return value;
    }
  }
  