#ifndef TOKEN_H
#define TOKEN_H

class Number;
namespace Bu
{
    class String;
    class Formatter;
};

class Token
{
public:
    enum Type
    {
        tNumber,
        tVariable,
        tCommand,
        tPlus,
        tMinus,
        tDivide,
        tMultiply,
        tModulus,
        tOpenParen,
        tCloseParen,
        tEquals,
        tString,

        tNegate,
        tEndOfLine,

        tEndOfInput,

        tUninitialized,
        tComputedValue
    };

    Token();
    Token( Type eType );
    Token( Type eType, Bu::String *s );
    Token( Type eType, Number *n );
    Token( const Token &rSrc );
    ~Token();

    Token &operator=( const Token &rhs );

    Type eType;
    union
    {
        Bu::String *sVal;
        class Number *nVal;
    };
};

Bu::Formatter &operator<<( Bu::Formatter &f, Token::Type eType );
Bu::Formatter &operator<<( Bu::Formatter &f, const Token &t );

#endif