Describe operator flags.

You can find more information in comments below.

enum OPERATOR_FLAG
    {
        ofSpace,      // Operator require spaces left and right 
        ofBlock,      // Operator is string block 
        ofMultiline,  // Block operator is multiline 
        ofPre,        // Operator can be "pre" 
        ofNormal,     // Operator can be "normal" 
        ofPost,       // Operator can be "post" 
        ofAllowPre,   // Operator can have another "pre" operator 
        ofAllowPost,  // Operator can have another "post" operator 
        ofMath,       // Operator is math 
        ofAssign,     // Operator is assignement operator(like :=) 
        ofNotOperator // Not real operator(like space, tab, new line, etc) 
    };