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#ifndef BU_LEXER_H
#define BU_LEXER_H
#include "bu/variant.h"
namespace Bu
{
class Stream;
/**
* The base class for creating a lexical analyzer. This is designed to work
* in tandem with the Bu::Parser class, which uses this to tokenize textual
* input. It can be used by just about anything that cares about tokens
* more than raw input, though.
*/
class Lexer
{
public:
Lexer();
virtual ~Lexer();
typedef int TokenType;
class Token
{
public:
Token();
Token( TokenType iToken );
template<class t>
Token( TokenType iToken, const t &v ) :
iToken( iToken ),
vExtra( v )
{
}
TokenType iToken;
Bu::Variant vExtra;
};
virtual Token *nextToken()=0;
virtual Bu::FString tokenToString( const Token &t );
};
};
#endif
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