anchor.diff:  
   variableName
       : ( ( Minus Minus ) Dollar | plusMinus Dollar | Dollar) identifier
  -    | plusMinus? ws namespace_? Dollar identifier
  +    | plusMinus? ws namespace_? Dollar ( identifier | measurment )
       | Variable
       ;
   
  
positive.code:     ;
  
  ifExpression
      : If Lparen expression Comma value Comma value Rparen prio?
      ;
  
  
  
negative.code: through
      : Number ws
      | functionCall
      | expression
      ;
  
  whileDeclaration
  